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    //! Linux-specific definitions for linux-like values

    pub type useconds_t = u32;
    pub type dev_t = u64;
    pub type socklen_t = u32;
    pub type mode_t = u32;
    pub type ino64_t = u64;
    pub type off64_t = i64;
    pub type blkcnt64_t = i64;
    pub type rlim64_t = u64;
    pub type mqd_t = ::c_int;
    pub type nfds_t = ::c_ulong;
    pub type nl_item = ::c_int;
    pub type idtype_t = ::c_uint;
    pub type loff_t = ::c_longlong;
    pub type pthread_key_t = ::c_uint;

    pub type __u8 = ::c_uchar;
    pub type __u16 = ::c_ushort;
    pub type __s16 = ::c_short;
    pub type __u32 = ::c_uint;
    pub type __s32 = ::c_int;

    pub type Elf32_Half = u16;
    pub type Elf32_Word = u32;
    pub type Elf32_Off = u32;
    pub type Elf32_Addr = u32;

    pub type Elf64_Half = u16;
    pub type Elf64_Word = u32;
    pub type Elf64_Off = u64;
    pub type Elf64_Addr = u64;
    pub type Elf64_Xword = u64;
    pub type Elf64_Sxword = i64;

    pub type Elf32_Section = u16;
    pub type Elf64_Section = u16;

    #[cfg_attr(feature = "extra_traits", derive(Debug))]
    pub enum fpos64_t {} // TODO: fill this out with a struct
    impl ::Copy for fpos64_t {}
    impl ::Clone for fpos64_t {
        fn clone(&self) -> fpos64_t { *self }
    }

    s! {
        pub struct rlimit64 {
            pub rlim_cur: rlim64_t,
            pub rlim_max: rlim64_t,
        }

        pub struct glob_t {
            pub gl_pathc: ::size_t,
            pub gl_pathv: *mut *mut c_char,
            pub gl_offs: ::size_t,
            pub gl_flags: ::c_int,

            __unused1: *mut ::c_void,
            __unused2: *mut ::c_void,
            __unused3: *mut ::c_void,
            __unused4: *mut ::c_void,
            __unused5: *mut ::c_void,
        }

        pub struct passwd {
            pub pw_name: *mut ::c_char,
            pub pw_passwd: *mut ::c_char,
            pub pw_uid: ::uid_t,
            pub pw_gid: ::gid_t,
            pub pw_gecos: *mut ::c_char,
            pub pw_dir: *mut ::c_char,
            pub pw_shell: *mut ::c_char,
        }

        pub struct spwd {
            pub sp_namp: *mut ::c_char,
            pub sp_pwdp: *mut ::c_char,
            pub sp_lstchg: ::c_long,
            pub sp_min: ::c_long,
            pub sp_max: ::c_long,
            pub sp_warn: ::c_long,
            pub sp_inact: ::c_long,
            pub sp_expire: ::c_long,
            pub sp_flag: ::c_ulong,
        }

        pub struct dqblk {
            pub dqb_bhardlimit: u64,
            pub dqb_bsoftlimit: u64,
            pub dqb_curspace: u64,
            pub dqb_ihardlimit: u64,
            pub dqb_isoftlimit: u64,
            pub dqb_curinodes: u64,
            pub dqb_btime: u64,
            pub dqb_itime: u64,
            pub dqb_valid: u32,
        }

        pub struct signalfd_siginfo {
            pub ssi_signo: u32,
            pub ssi_errno: i32,
            pub ssi_code: i32,
            pub ssi_pid: u32,
            pub ssi_uid: u32,
            pub ssi_fd: i32,
            pub ssi_tid: u32,
            pub ssi_band: u32,
            pub ssi_overrun: u32,
            pub ssi_trapno: u32,
            pub ssi_status: i32,
            pub ssi_int: i32,
            pub ssi_ptr: u64,
            pub ssi_utime: u64,
            pub ssi_stime: u64,
            pub ssi_addr: u64,
            pub ssi_addr_lsb: u16,
            _pad2: u16,
            pub ssi_syscall: i32,
            pub ssi_call_addr: u64,
            pub ssi_arch: u32,
            _pad: [u8; 28],
        }

        pub struct itimerspec {
            pub it_interval: ::timespec,
            pub it_value: ::timespec,
        }

        pub struct fsid_t {
            __val: [::c_int; 2],
        }

        pub struct packet_mreq {
            pub mr_ifindex: ::c_int,
            pub mr_type: ::c_ushort,
            pub mr_alen: ::c_ushort,
            pub mr_address: [::c_uchar; 8],
        }

        pub struct cpu_set_t {
            #[cfg(all(target_pointer_width = "32",
                      not(target_arch = "x86_64")))]
            bits: [u32; 32],
            #[cfg(not(all(target_pointer_width = "32",
                          not(target_arch = "x86_64"))))]
            bits: [u64; 16],
        }

        pub struct if_nameindex {
            pub if_index: ::c_uint,
            pub if_name: *mut ::c_char,
        }

        // System V IPC
        pub struct msginfo {
            pub msgpool: ::c_int,
            pub msgmap: ::c_int,
            pub msgmax: ::c_int,
            pub msgmnb: ::c_int,
            pub msgmni: ::c_int,
            pub msgssz: ::c_int,
            pub msgtql: ::c_int,
            pub msgseg: ::c_ushort,
        }

        pub struct sembuf {
            pub sem_num: ::c_ushort,
            pub sem_op: ::c_short,
            pub sem_flg: ::c_short,
        }

        pub struct input_event {
            pub time: ::timeval,
            pub type_: ::__u16,
            pub code: ::__u16,
            pub value: ::__s32,
        }

        pub struct input_id {
            pub bustype: ::__u16,
            pub vendor: ::__u16,
            pub product: ::__u16,
            pub version: ::__u16,
        }

        pub struct input_absinfo {
            pub value: ::__s32,
            pub minimum: ::__s32,
            pub maximum: ::__s32,
            pub fuzz: ::__s32,
            pub flat: ::__s32,
            pub resolution: ::__s32,
        }

        pub struct input_keymap_entry {
            pub flags: ::__u8,
            pub len: ::__u8,
            pub index: ::__u16,
            pub keycode: ::__u32,
            pub scancode: [::__u8; 32],
        }

        pub struct input_mask {
            pub type_: ::__u32,
            pub codes_size: ::__u32,
            pub codes_ptr: ::__u64,
        }

        pub struct ff_replay {
            pub length: ::__u16,
            pub delay: ::__u16,
        }

        pub struct ff_trigger {
            pub button: ::__u16,
            pub interval: ::__u16,
        }

        pub struct ff_envelope {
            pub attack_length: ::__u16,
            pub attack_level: ::__u16,
            pub fade_length: ::__u16,
            pub fade_level: ::__u16,
        }

        pub struct ff_constant_effect {
            pub level: ::__s16,
            pub envelope: ff_envelope,
        }

        pub struct ff_ramp_effect {
            pub start_level: ::__s16,
            pub end_level: ::__s16,
            pub envelope: ff_envelope,
        }

        pub struct ff_condition_effect {
            pub right_saturation: ::__u16,
            pub left_saturation: ::__u16,

            pub right_coeff: ::__s16,
            pub left_coeff: ::__s16,

            pub deadband: ::__u16,
            pub center: ::__s16,
        }

        pub struct ff_periodic_effect {
            pub waveform: ::__u16,
            pub period: ::__u16,
            pub magnitude: ::__s16,
            pub offset: ::__s16,
            pub phase: ::__u16,

            pub envelope: ff_envelope,

            pub custom_len: ::__u32,
            pub custom_data: *mut ::__s16,
        }

        pub struct ff_rumble_effect {
            pub strong_magnitude: ::__u16,
            pub weak_magnitude: ::__u16,
        }

        pub struct ff_effect {
            pub type_: ::__u16,
            pub id: ::__s16,
            pub direction: ::__u16,
            pub trigger: ff_trigger,
            pub replay: ff_replay,
            // FIXME this is actually a union
            #[cfg(target_pointer_width = "64")]
            pub u: [u64; 4],
            #[cfg(target_pointer_width = "32")]
            pub u: [u32; 7],
        }

        pub struct dl_phdr_info {
            #[cfg(target_pointer_width = "64")]
            pub dlpi_addr: Elf64_Addr,
            #[cfg(target_pointer_width = "32")]
            pub dlpi_addr: Elf32_Addr,

            pub dlpi_name: *const ::c_char,

            #[cfg(target_pointer_width = "64")]
            pub dlpi_phdr: *const Elf64_Phdr,
            #[cfg(target_pointer_width = "32")]
            pub dlpi_phdr: *const Elf32_Phdr,

            #[cfg(target_pointer_width = "64")]
            pub dlpi_phnum: Elf64_Half,
            #[cfg(target_pointer_width = "32")]
            pub dlpi_phnum: Elf32_Half,

            pub dlpi_adds: ::c_ulonglong,
            pub dlpi_subs: ::c_ulonglong,
            pub dlpi_tls_modid: ::size_t,
            pub dlpi_tls_data: *mut ::c_void,
        }

        pub struct Elf32_Ehdr {
            pub e_ident: [::c_uchar; 16],
            pub e_type: Elf32_Half,
            pub e_machine: Elf32_Half,
            pub e_version: Elf32_Word,
            pub e_entry: Elf32_Addr,
            pub e_phoff: Elf32_Off,
            pub e_shoff: Elf32_Off,
            pub e_flags: Elf32_Word,
            pub e_ehsize: Elf32_Half,
            pub e_phentsize: Elf32_Half,
            pub e_phnum: Elf32_Half,
            pub e_shentsize: Elf32_Half,
            pub e_shnum: Elf32_Half,
            pub e_shstrndx: Elf32_Half,
        }

        pub struct Elf64_Ehdr {
            pub e_ident: [::c_uchar; 16],
            pub e_type: Elf64_Half,
            pub e_machine: Elf64_Half,
            pub e_version: Elf64_Word,
            pub e_entry: Elf64_Addr,
            pub e_phoff: Elf64_Off,
            pub e_shoff: Elf64_Off,
            pub e_flags: Elf64_Word,
            pub e_ehsize: Elf64_Half,
            pub e_phentsize: Elf64_Half,
            pub e_phnum: Elf64_Half,
            pub e_shentsize: Elf64_Half,
            pub e_shnum: Elf64_Half,
            pub e_shstrndx: Elf64_Half,
        }

        pub struct Elf32_Sym {
            pub st_name: Elf32_Word,
            pub st_value: Elf32_Addr,
            pub st_size: Elf32_Word,
            pub st_info: ::c_uchar,
            pub st_other: ::c_uchar,
            pub st_shndx: Elf32_Section,
        }

        pub struct Elf64_Sym {
            pub st_name: Elf64_Word,
            pub st_info: ::c_uchar,
            pub st_other: ::c_uchar,
            pub st_shndx: Elf64_Section,
            pub st_value: Elf64_Addr,
            pub st_size: Elf64_Xword,
        }

        pub struct Elf32_Phdr {
            pub p_type: Elf32_Word,
            pub p_offset: Elf32_Off,
            pub p_vaddr: Elf32_Addr,
            pub p_paddr: Elf32_Addr,
            pub p_filesz: Elf32_Word,
            pub p_memsz: Elf32_Word,
            pub p_flags: Elf32_Word,
            pub p_align: Elf32_Word,
        }

        pub struct Elf64_Phdr {
            pub p_type: Elf64_Word,
            pub p_flags: Elf64_Word,
            pub p_offset: Elf64_Off,
            pub p_vaddr: Elf64_Addr,
            pub p_paddr: Elf64_Addr,
            pub p_filesz: Elf64_Xword,
            pub p_memsz: Elf64_Xword,
            pub p_align: Elf64_Xword,
        }

        pub struct Elf32_Shdr {
            pub sh_name: Elf32_Word,
            pub sh_type: Elf32_Word,
            pub sh_flags: Elf32_Word,
            pub sh_addr: Elf32_Addr,
            pub sh_offset: Elf32_Off,
            pub sh_size: Elf32_Word,
            pub sh_link: Elf32_Word,
            pub sh_info: Elf32_Word,
            pub sh_addralign: Elf32_Word,
            pub sh_entsize: Elf32_Word,
        }

        pub struct Elf64_Shdr {
            pub sh_name: Elf64_Word,
            pub sh_type: Elf64_Word,
            pub sh_flags: Elf64_Xword,
            pub sh_addr: Elf64_Addr,
            pub sh_offset: Elf64_Off,
            pub sh_size: Elf64_Xword,
            pub sh_link: Elf64_Word,
            pub sh_info: Elf64_Word,
            pub sh_addralign: Elf64_Xword,
            pub sh_entsize: Elf64_Xword,
        }

        pub struct Elf32_Chdr {
            pub ch_type: Elf32_Word,
            pub ch_size: Elf32_Word,
            pub ch_addralign: Elf32_Word,
        }

        pub struct Elf64_Chdr {
            pub ch_type: Elf64_Word,
            pub ch_reserved: Elf64_Word,
            pub ch_size: Elf64_Xword,
            pub ch_addralign: Elf64_Xword,
        }

        pub struct ucred {
            pub pid: ::pid_t,
            pub uid: ::uid_t,
            pub gid: ::gid_t,
        }

        pub struct mntent {
            pub mnt_fsname: *mut ::c_char,
            pub mnt_dir: *mut ::c_char,
            pub mnt_type: *mut ::c_char,
            pub mnt_opts: *mut ::c_char,
            pub mnt_freq: ::c_int,
            pub mnt_passno: ::c_int,
        }

        pub struct posix_spawn_file_actions_t {
            __allocated: ::c_int,
            __used: ::c_int,
            __actions: *mut ::c_int,
            __pad: [::c_int; 16],
        }

        pub struct posix_spawnattr_t {
            __flags: ::c_short,
            __pgrp: ::pid_t,
            __sd: ::sigset_t,
            __ss: ::sigset_t,
            #[cfg(target_env = "musl")]
            __prio: ::c_int,
            #[cfg(not(target_env = "musl"))]
            __sp: ::sched_param,
            __policy: ::c_int,
            __pad: [::c_int; 16],
        }

        pub struct genlmsghdr {
            pub cmd: u8,
            pub version: u8,
            pub reserved: u16,
        }

        pub struct in6_pktinfo {
            pub ipi6_addr: ::in6_addr,
            pub ipi6_ifindex: ::c_uint,
        }

        pub struct arpd_request {
            pub req: ::c_ushort,
            pub ip: u32,
            pub dev: ::c_ulong,
            pub stamp: ::c_ulong,
            pub updated: ::c_ulong,
            pub ha: [::c_uchar; ::MAX_ADDR_LEN],
        }

        pub struct inotify_event {
            pub wd: ::c_int,
            pub mask: u32,
            pub cookie: u32,
            pub len: u32
        }

        pub struct sockaddr_vm {
            pub svm_family: ::sa_family_t,
            pub svm_reserved1: ::c_ushort,
            pub svm_port: ::c_uint,
            pub svm_cid: ::c_uint,
            pub svm_zero: [u8; 4]
        }
    }

    s_no_extra_traits!{
        pub struct sockaddr_nl {
            pub nl_family: ::sa_family_t,
            nl_pad: ::c_ushort,
            pub nl_pid: u32,
            pub nl_groups: u32
        }

        pub struct dirent {
            pub d_ino: ::ino_t,
            pub d_off: ::off_t,
            pub d_reclen: ::c_ushort,
            pub d_type: ::c_uchar,
            pub d_name: [::c_char; 256],
        }

        pub struct dirent64 {
            pub d_ino: ::ino64_t,
            pub d_off: ::off64_t,
            pub d_reclen: ::c_ushort,
            pub d_type: ::c_uchar,
            pub d_name: [::c_char; 256],
        }

        pub struct sockaddr_alg {
            pub salg_family: ::sa_family_t,
            pub salg_type: [::c_uchar; 14],
            pub salg_feat: u32,
            pub salg_mask: u32,
            pub salg_name: [::c_uchar; 64],
        }

        pub struct af_alg_iv {
            pub ivlen: u32,
            pub iv: [::c_uchar; 0],
        }

        // x32 compatibility
        // See https://sourceware.org/bugzilla/show_bug.cgi?id=21279
        pub struct mq_attr {
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            pub mq_flags: i64,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            pub mq_maxmsg: i64,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            pub mq_msgsize: i64,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            pub mq_curmsgs: i64,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            pad: [i64; 4],

            #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
            pub mq_flags: ::c_long,
            #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
            pub mq_maxmsg: ::c_long,
            #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
            pub mq_msgsize: ::c_long,
            #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
            pub mq_curmsgs: ::c_long,
            #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
            pad: [::c_long; 4],
        }
    }

    cfg_if! {
        if #[cfg(feature = "extra_traits")] {
            impl PartialEq for sockaddr_nl {
                fn eq(&self, other: &sockaddr_nl) -> bool {
                    self.nl_family == other.nl_family &&
                        self.nl_pid == other.nl_pid &&
                        self.nl_groups == other.nl_groups
                }
            }
            impl Eq for sockaddr_nl {}
            impl ::fmt::Debug for sockaddr_nl {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    f.debug_struct("sockaddr_nl")
                        .field("nl_family", &self.nl_family)
                        .field("nl_pid", &self.nl_pid)
                        .field("nl_groups", &self.nl_groups)
                        .finish()
                }
            }
            impl ::hash::Hash for sockaddr_nl {
                fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                    self.nl_family.hash(state);
                    self.nl_pid.hash(state);
                    self.nl_groups.hash(state);
                }
            }

            impl PartialEq for dirent {
                fn eq(&self, other: &dirent) -> bool {
                    self.d_ino == other.d_ino
                        && self.d_off == other.d_off
                        && self.d_reclen == other.d_reclen
                        && self.d_type == other.d_type
                        && self
                        .d_name
                        .iter()
                        .zip(other.d_name.iter())
                        .all(|(a,b)| a == b)
                }
            }

            impl Eq for dirent {}

            impl ::fmt::Debug for dirent {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    f.debug_struct("dirent")
                        .field("d_ino", &self.d_ino)
                        .field("d_off", &self.d_off)
                        .field("d_reclen", &self.d_reclen)
                        .field("d_type", &self.d_type)
                    // FIXME: .field("d_name", &self.d_name)
                        .finish()
                }
            }

            impl ::hash::Hash for dirent {
                fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                    self.d_ino.hash(state);
                    self.d_off.hash(state);
                    self.d_reclen.hash(state);
                    self.d_type.hash(state);
                    self.d_name.hash(state);
                }
            }

            impl PartialEq for dirent64 {
                fn eq(&self, other: &dirent64) -> bool {
                    self.d_ino == other.d_ino
                        && self.d_off == other.d_off
                        && self.d_reclen == other.d_reclen
                        && self.d_type == other.d_type
                        && self
                        .d_name
                        .iter()
                        .zip(other.d_name.iter())
                        .all(|(a,b)| a == b)
                }
            }

            impl Eq for dirent64 {}

            impl ::fmt::Debug for dirent64 {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    f.debug_struct("dirent64")
                        .field("d_ino", &self.d_ino)
                        .field("d_off", &self.d_off)
                        .field("d_reclen", &self.d_reclen)
                        .field("d_type", &self.d_type)
                    // FIXME: .field("d_name", &self.d_name)
                        .finish()
                }
            }

            impl ::hash::Hash for dirent64 {
                fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                    self.d_ino.hash(state);
                    self.d_off.hash(state);
                    self.d_reclen.hash(state);
                    self.d_type.hash(state);
                    self.d_name.hash(state);
                }
            }

            impl PartialEq for pthread_cond_t {
                fn eq(&self, other: &pthread_cond_t) -> bool {
                    self.size.iter().zip(other.size.iter()).all(|(a,b)| a == b)
                }
            }

            impl Eq for pthread_cond_t {}

            impl ::fmt::Debug for pthread_cond_t {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    f.debug_struct("pthread_cond_t")
                    // FIXME: .field("size", &self.size)
                        .finish()
                }
            }

            impl ::hash::Hash for pthread_cond_t {
                fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                    self.size.hash(state);
                }
            }

            impl PartialEq for pthread_mutex_t {
                fn eq(&self, other: &pthread_mutex_t) -> bool {
                    self.size.iter().zip(other.size.iter()).all(|(a,b)| a == b)
                }
            }

            impl Eq for pthread_mutex_t {}

            impl ::fmt::Debug for pthread_mutex_t {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    f.debug_struct("pthread_mutex_t")
                    // FIXME: .field("size", &self.size)
                        .finish()
                }
            }

            impl ::hash::Hash for pthread_mutex_t {
                fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                    self.size.hash(state);
                }
            }

            impl PartialEq for pthread_rwlock_t {
                fn eq(&self, other: &pthread_rwlock_t) -> bool {
                    self.size.iter().zip(other.size.iter()).all(|(a,b)| a == b)
                }
            }

            impl Eq for pthread_rwlock_t {}

            impl ::fmt::Debug for pthread_rwlock_t {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    f.debug_struct("pthread_rwlock_t")
                    // FIXME: .field("size", &self.size)
                        .finish()
                }
            }

            impl ::hash::Hash for pthread_rwlock_t {
                fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                    self.size.hash(state);
                }
            }

            impl PartialEq for sockaddr_alg {
                fn eq(&self, other: &sockaddr_alg) -> bool {
                    self.salg_family == other.salg_family
                        && self
                        .salg_type
                        .iter()
                        .zip(other.salg_type.iter())
                        .all(|(a, b)| a == b)
                        && self.salg_feat == other.salg_feat
                        && self.salg_mask == other.salg_mask
                        && self
                        .salg_name
                        .iter()
                        .zip(other.salg_name.iter())
                        .all(|(a, b)| a == b)
               }
            }

            impl Eq for sockaddr_alg {}

            impl ::fmt::Debug for sockaddr_alg {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    f.debug_struct("sockaddr_alg")
                        .field("salg_family", &self.salg_family)
                        .field("salg_type", &self.salg_type)
                        .field("salg_feat", &self.salg_feat)
                        .field("salg_mask", &self.salg_mask)
                        .field("salg_name", &&self.salg_name[..])
                        .finish()
                }
            }

            impl ::hash::Hash for sockaddr_alg {
                fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                    self.salg_family.hash(state);
                    self.salg_type.hash(state);
                    self.salg_feat.hash(state);
                    self.salg_mask.hash(state);
                    self.salg_name.hash(state);
                }
            }

            impl af_alg_iv {
                fn as_slice(&self) -> &[u8] {
                    unsafe {
                        ::core::slice::from_raw_parts(
                            self.iv.as_ptr(),
                            self.ivlen as usize
                        )
                    }
                }
            }

            impl PartialEq for af_alg_iv {
                fn eq(&self, other: &af_alg_iv) -> bool {
                    *self.as_slice() == *other.as_slice()
               }
            }

            impl Eq for af_alg_iv {}

            impl ::fmt::Debug for af_alg_iv {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    f.debug_struct("af_alg_iv")
                        .field("iv", &self.as_slice())
                        .finish()
                }
            }

            impl ::hash::Hash for af_alg_iv {
                fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                    self.as_slice().hash(state);
                }
            }

            impl PartialEq for mq_attr {
                fn eq(&self, other: &mq_attr) -> bool {
                    self.mq_flags == other.mq_flags &&
                    self.mq_maxmsg == other.mq_maxmsg &&
                    self.mq_msgsize == other.mq_msgsize &&
                    self.mq_curmsgs == other.mq_curmsgs
                }
            }
            impl Eq for mq_attr {}
            impl ::fmt::Debug for mq_attr {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    f.debug_struct("mq_attr")
                        .field("mq_flags", &self.mq_flags)
                        .field("mq_maxmsg", &self.mq_maxmsg)
                        .field("mq_msgsize", &self.mq_msgsize)
                        .field("mq_curmsgs", &self.mq_curmsgs)
                        .finish()
                }
            }
            impl ::hash::Hash for mq_attr {
                fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                    self.mq_flags.hash(state);
                    self.mq_maxmsg.hash(state);
                    self.mq_msgsize.hash(state);
                    self.mq_curmsgs.hash(state);
                }
            }
        }
    }

    pub const ABDAY_1: ::nl_item = 0x20000;
    pub const ABDAY_2: ::nl_item = 0x20001;
    pub const ABDAY_3: ::nl_item = 0x20002;
    pub const ABDAY_4: ::nl_item = 0x20003;
    pub const ABDAY_5: ::nl_item = 0x20004;
    pub const ABDAY_6: ::nl_item = 0x20005;
    pub const ABDAY_7: ::nl_item = 0x20006;

    pub const DAY_1: ::nl_item = 0x20007;
    pub const DAY_2: ::nl_item = 0x20008;
    pub const DAY_3: ::nl_item = 0x20009;
    pub const DAY_4: ::nl_item = 0x2000A;
    pub const DAY_5: ::nl_item = 0x2000B;
    pub const DAY_6: ::nl_item = 0x2000C;
    pub const DAY_7: ::nl_item = 0x2000D;

    pub const ABMON_1: ::nl_item = 0x2000E;
    pub const ABMON_2: ::nl_item = 0x2000F;
    pub const ABMON_3: ::nl_item = 0x20010;
    pub const ABMON_4: ::nl_item = 0x20011;
    pub const ABMON_5: ::nl_item = 0x20012;
    pub const ABMON_6: ::nl_item = 0x20013;
    pub const ABMON_7: ::nl_item = 0x20014;
    pub const ABMON_8: ::nl_item = 0x20015;
    pub const ABMON_9: ::nl_item = 0x20016;
    pub const ABMON_10: ::nl_item = 0x20017;
    pub const ABMON_11: ::nl_item = 0x20018;
    pub const ABMON_12: ::nl_item = 0x20019;

    pub const MON_1: ::nl_item = 0x2001A;
    pub const MON_2: ::nl_item = 0x2001B;
    pub const MON_3: ::nl_item = 0x2001C;
    pub const MON_4: ::nl_item = 0x2001D;
    pub const MON_5: ::nl_item = 0x2001E;
    pub const MON_6: ::nl_item = 0x2001F;
    pub const MON_7: ::nl_item = 0x20020;
    pub const MON_8: ::nl_item = 0x20021;
    pub const MON_9: ::nl_item = 0x20022;
    pub const MON_10: ::nl_item = 0x20023;
    pub const MON_11: ::nl_item = 0x20024;
    pub const MON_12: ::nl_item = 0x20025;

    pub const AM_STR: ::nl_item = 0x20026;
    pub const PM_STR: ::nl_item = 0x20027;

    pub const D_T_FMT: ::nl_item = 0x20028;
    pub const D_FMT: ::nl_item = 0x20029;
    pub const T_FMT: ::nl_item = 0x2002A;
    pub const T_FMT_AMPM: ::nl_item = 0x2002B;

    pub const ERA: ::nl_item = 0x2002C;
    pub const ERA_D_FMT: ::nl_item = 0x2002E;
    pub const ALT_DIGITS: ::nl_item = 0x2002F;
    pub const ERA_D_T_FMT: ::nl_item = 0x20030;
    pub const ERA_T_FMT: ::nl_item = 0x20031;

    pub const CODESET: ::nl_item = 14;

    pub const CRNCYSTR: ::nl_item = 0x4000F;

    pub const RUSAGE_THREAD: ::c_int = 1;
    pub const RUSAGE_CHILDREN: ::c_int = -1;

    pub const RADIXCHAR: ::nl_item = 0x10000;
    pub const THOUSEP: ::nl_item = 0x10001;

    pub const YESEXPR: ::nl_item = 0x50000;
    pub const NOEXPR: ::nl_item = 0x50001;
    pub const YESSTR: ::nl_item = 0x50002;
    pub const NOSTR: ::nl_item = 0x50003;

    pub const FILENAME_MAX: ::c_uint = 4096;
    pub const L_tmpnam: ::c_uint = 20;
    pub const _PC_LINK_MAX: ::c_int = 0;
    pub const _PC_MAX_CANON: ::c_int = 1;
    pub const _PC_MAX_INPUT: ::c_int = 2;
    pub const _PC_NAME_MAX: ::c_int = 3;
    pub const _PC_PATH_MAX: ::c_int = 4;
    pub const _PC_PIPE_BUF: ::c_int = 5;
    pub const _PC_CHOWN_RESTRICTED: ::c_int = 6;
    pub const _PC_NO_TRUNC: ::c_int = 7;
    pub const _PC_VDISABLE: ::c_int = 8;
    pub const _PC_SYNC_IO: ::c_int = 9;
    pub const _PC_ASYNC_IO: ::c_int = 10;
    pub const _PC_PRIO_IO: ::c_int = 11;
    pub const _PC_SOCK_MAXBUF: ::c_int = 12;
    pub const _PC_FILESIZEBITS: ::c_int = 13;
    pub const _PC_REC_INCR_XFER_SIZE: ::c_int = 14;
    pub const _PC_REC_MAX_XFER_SIZE: ::c_int = 15;
    pub const _PC_REC_MIN_XFER_SIZE: ::c_int = 16;
    pub const _PC_REC_XFER_ALIGN: ::c_int = 17;
    pub const _PC_ALLOC_SIZE_MIN: ::c_int = 18;
    pub const _PC_SYMLINK_MAX: ::c_int = 19;
    pub const _PC_2_SYMLINKS: ::c_int = 20;

    pub const MS_NOUSER: ::c_ulong = 0xffffffff80000000;

    pub const _SC_ARG_MAX: ::c_int = 0;
    pub const _SC_CHILD_MAX: ::c_int = 1;
    pub const _SC_CLK_TCK: ::c_int = 2;
    pub const _SC_NGROUPS_MAX: ::c_int = 3;
    pub const _SC_OPEN_MAX: ::c_int = 4;
    pub const _SC_STREAM_MAX: ::c_int = 5;
    pub const _SC_TZNAME_MAX: ::c_int = 6;
    pub const _SC_JOB_CONTROL: ::c_int = 7;
    pub const _SC_SAVED_IDS: ::c_int = 8;
    pub const _SC_REALTIME_SIGNALS: ::c_int = 9;
    pub const _SC_PRIORITY_SCHEDULING: ::c_int = 10;
    pub const _SC_TIMERS: ::c_int = 11;
    pub const _SC_ASYNCHRONOUS_IO: ::c_int = 12;
    pub const _SC_PRIORITIZED_IO: ::c_int = 13;
    pub const _SC_SYNCHRONIZED_IO: ::c_int = 14;
    pub const _SC_FSYNC: ::c_int = 15;
    pub const _SC_MAPPED_FILES: ::c_int = 16;
    pub const _SC_MEMLOCK: ::c_int = 17;
    pub const _SC_MEMLOCK_RANGE: ::c_int = 18;
    pub const _SC_MEMORY_PROTECTION: ::c_int = 19;
    pub const _SC_MESSAGE_PASSING: ::c_int = 20;
    pub const _SC_SEMAPHORES: ::c_int = 21;
    pub const _SC_SHARED_MEMORY_OBJECTS: ::c_int = 22;
    pub const _SC_AIO_LISTIO_MAX: ::c_int = 23;
    pub const _SC_AIO_MAX: ::c_int = 24;
    pub const _SC_AIO_PRIO_DELTA_MAX: ::c_int = 25;
    pub const _SC_DELAYTIMER_MAX: ::c_int = 26;
    pub const _SC_MQ_OPEN_MAX: ::c_int = 27;
    pub const _SC_MQ_PRIO_MAX: ::c_int = 28;
    pub const _SC_VERSION: ::c_int = 29;
    pub const _SC_PAGESIZE: ::c_int = 30;
    pub const _SC_PAGE_SIZE: ::c_int = _SC_PAGESIZE;
    pub const _SC_RTSIG_MAX: ::c_int = 31;
    pub const _SC_SEM_NSEMS_MAX: ::c_int = 32;
    pub const _SC_SEM_VALUE_MAX: ::c_int = 33;
    pub const _SC_SIGQUEUE_MAX: ::c_int = 34;
    pub const _SC_TIMER_MAX: ::c_int = 35;
    pub const _SC_BC_BASE_MAX: ::c_int = 36;
    pub const _SC_BC_DIM_MAX: ::c_int = 37;
    pub const _SC_BC_SCALE_MAX: ::c_int = 38;
    pub const _SC_BC_STRING_MAX: ::c_int = 39;
    pub const _SC_COLL_WEIGHTS_MAX: ::c_int = 40;
    pub const _SC_EXPR_NEST_MAX: ::c_int = 42;
    pub const _SC_LINE_MAX: ::c_int = 43;
    pub const _SC_RE_DUP_MAX: ::c_int = 44;
    pub const _SC_2_VERSION: ::c_int = 46;
    pub const _SC_2_C_BIND: ::c_int = 47;
    pub const _SC_2_C_DEV: ::c_int = 48;
    pub const _SC_2_FORT_DEV: ::c_int = 49;
    pub const _SC_2_FORT_RUN: ::c_int = 50;
    pub const _SC_2_SW_DEV: ::c_int = 51;
    pub const _SC_2_LOCALEDEF: ::c_int = 52;
    pub const _SC_UIO_MAXIOV: ::c_int = 60;
    pub const _SC_IOV_MAX: ::c_int = 60;
    pub const _SC_THREADS: ::c_int = 67;
    pub const _SC_THREAD_SAFE_FUNCTIONS: ::c_int = 68;
    pub const _SC_GETGR_R_SIZE_MAX: ::c_int = 69;
    pub const _SC_GETPW_R_SIZE_MAX: ::c_int = 70;
    pub const _SC_LOGIN_NAME_MAX: ::c_int = 71;
    pub const _SC_TTY_NAME_MAX: ::c_int = 72;
    pub const _SC_THREAD_DESTRUCTOR_ITERATIONS: ::c_int = 73;
    pub const _SC_THREAD_KEYS_MAX: ::c_int = 74;
    pub const _SC_THREAD_STACK_MIN: ::c_int = 75;
    pub const _SC_THREAD_THREADS_MAX: ::c_int = 76;
    pub const _SC_THREAD_ATTR_STACKADDR: ::c_int = 77;
    pub const _SC_THREAD_ATTR_STACKSIZE: ::c_int = 78;
    pub const _SC_THREAD_PRIORITY_SCHEDULING: ::c_int = 79;
    pub const _SC_THREAD_PRIO_INHERIT: ::c_int = 80;
    pub const _SC_THREAD_PRIO_PROTECT: ::c_int = 81;
    pub const _SC_THREAD_PROCESS_SHARED: ::c_int = 82;
    pub const _SC_NPROCESSORS_CONF: ::c_int = 83;
    pub const _SC_NPROCESSORS_ONLN: ::c_int = 84;
    pub const _SC_PHYS_PAGES: ::c_int = 85;
    pub const _SC_AVPHYS_PAGES: ::c_int = 86;
    pub const _SC_ATEXIT_MAX: ::c_int = 87;
    pub const _SC_PASS_MAX: ::c_int = 88;
    pub const _SC_XOPEN_VERSION: ::c_int = 89;
    pub const _SC_XOPEN_XCU_VERSION: ::c_int = 90;
    pub const _SC_XOPEN_UNIX: ::c_int = 91;
    pub const _SC_XOPEN_CRYPT: ::c_int = 92;
    pub const _SC_XOPEN_ENH_I18N: ::c_int = 93;
    pub const _SC_XOPEN_SHM: ::c_int = 94;
    pub const _SC_2_CHAR_TERM: ::c_int = 95;
    pub const _SC_2_UPE: ::c_int = 97;
    pub const _SC_XOPEN_XPG2: ::c_int = 98;
    pub const _SC_XOPEN_XPG3: ::c_int = 99;
    pub const _SC_XOPEN_XPG4: ::c_int = 100;
    pub const _SC_NZERO: ::c_int = 109;
    pub const _SC_XBS5_ILP32_OFF32: ::c_int = 125;
    pub const _SC_XBS5_ILP32_OFFBIG: ::c_int = 126;
    pub const _SC_XBS5_LP64_OFF64: ::c_int = 127;
    pub const _SC_XBS5_LPBIG_OFFBIG: ::c_int = 128;
    pub const _SC_XOPEN_LEGACY: ::c_int = 129;
    pub const _SC_XOPEN_REALTIME: ::c_int = 130;
    pub const _SC_XOPEN_REALTIME_THREADS: ::c_int = 131;
    pub const _SC_ADVISORY_INFO: ::c_int = 132;
    pub const _SC_BARRIERS: ::c_int = 133;
    pub const _SC_CLOCK_SELECTION: ::c_int = 137;
    pub const _SC_CPUTIME: ::c_int = 138;
    pub const _SC_THREAD_CPUTIME: ::c_int = 139;
    pub const _SC_MONOTONIC_CLOCK: ::c_int = 149;
    pub const _SC_READER_WRITER_LOCKS: ::c_int = 153;
    pub const _SC_SPIN_LOCKS: ::c_int = 154;
    pub const _SC_REGEXP: ::c_int = 155;
    pub const _SC_SHELL: ::c_int = 157;
    pub const _SC_SPAWN: ::c_int = 159;
    pub const _SC_SPORADIC_SERVER: ::c_int = 160;
    pub const _SC_THREAD_SPORADIC_SERVER: ::c_int = 161;
    pub const _SC_TIMEOUTS: ::c_int = 164;
    pub const _SC_TYPED_MEMORY_OBJECTS: ::c_int = 165;
    pub const _SC_2_PBS: ::c_int = 168;
    pub const _SC_2_PBS_ACCOUNTING: ::c_int = 169;
    pub const _SC_2_PBS_LOCATE: ::c_int = 170;
    pub const _SC_2_PBS_MESSAGE: ::c_int = 171;
    pub const _SC_2_PBS_TRACK: ::c_int = 172;
    pub const _SC_SYMLOOP_MAX: ::c_int = 173;
    pub const _SC_STREAMS: ::c_int = 174;
    pub const _SC_2_PBS_CHECKPOINT: ::c_int = 175;
    pub const _SC_V6_ILP32_OFF32: ::c_int = 176;
    pub const _SC_V6_ILP32_OFFBIG: ::c_int = 177;
    pub const _SC_V6_LP64_OFF64: ::c_int = 178;
    pub const _SC_V6_LPBIG_OFFBIG: ::c_int = 179;
    pub const _SC_HOST_NAME_MAX: ::c_int = 180;
    pub const _SC_TRACE: ::c_int = 181;
    pub const _SC_TRACE_EVENT_FILTER: ::c_int = 182;
    pub const _SC_TRACE_INHERIT: ::c_int = 183;
    pub const _SC_TRACE_LOG: ::c_int = 184;
    pub const _SC_IPV6: ::c_int = 235;
    pub const _SC_RAW_SOCKETS: ::c_int = 236;
    pub const _SC_V7_ILP32_OFF32: ::c_int = 237;
    pub const _SC_V7_ILP32_OFFBIG: ::c_int = 238;
    pub const _SC_V7_LP64_OFF64: ::c_int = 239;
    pub const _SC_V7_LPBIG_OFFBIG: ::c_int = 240;
    pub const _SC_SS_REPL_MAX: ::c_int = 241;
    pub const _SC_TRACE_EVENT_NAME_MAX: ::c_int = 242;
    pub const _SC_TRACE_NAME_MAX: ::c_int = 243;
    pub const _SC_TRACE_SYS_MAX: ::c_int = 244;
    pub const _SC_TRACE_USER_EVENT_MAX: ::c_int = 245;
    pub const _SC_XOPEN_STREAMS: ::c_int = 246;
    pub const _SC_THREAD_ROBUST_PRIO_INHERIT: ::c_int = 247;
    pub const _SC_THREAD_ROBUST_PRIO_PROTECT: ::c_int = 248;

    pub const RLIM_SAVED_MAX: ::rlim_t = RLIM_INFINITY;
    pub const RLIM_SAVED_CUR: ::rlim_t = RLIM_INFINITY;

    pub const GLOB_ERR: ::c_int = 1 << 0;
    pub const GLOB_MARK: ::c_int = 1 << 1;
    pub const GLOB_NOSORT: ::c_int = 1 << 2;
    pub const GLOB_DOOFFS: ::c_int = 1 << 3;
    pub const GLOB_NOCHECK: ::c_int = 1 << 4;
    pub const GLOB_APPEND: ::c_int = 1 << 5;
    pub const GLOB_NOESCAPE: ::c_int = 1 << 6;

    pub const GLOB_NOSPACE: ::c_int = 1;
    pub const GLOB_ABORTED: ::c_int = 2;
    pub const GLOB_NOMATCH: ::c_int = 3;

    pub const POSIX_MADV_NORMAL: ::c_int = 0;
    pub const POSIX_MADV_RANDOM: ::c_int = 1;
    pub const POSIX_MADV_SEQUENTIAL: ::c_int = 2;
    pub const POSIX_MADV_WILLNEED: ::c_int = 3;

    pub const S_IEXEC: mode_t = 64;
    pub const S_IWRITE: mode_t = 128;
    pub const S_IREAD: mode_t = 256;

    pub const F_LOCK: ::c_int = 1;
    pub const F_TEST: ::c_int = 3;
    pub const F_TLOCK: ::c_int = 2;
    pub const F_ULOCK: ::c_int = 0;

    pub const F_SEAL_FUTURE_WRITE: ::c_int = 0x0010;

    pub const IFF_LOWER_UP: ::c_int = 0x10000;
    pub const IFF_DORMANT: ::c_int = 0x20000;
    pub const IFF_ECHO: ::c_int = 0x40000;

    // linux/if_addr.h
    pub const IFA_UNSPEC: ::c_ushort = 0;
    pub const IFA_ADDRESS: ::c_ushort = 1;
    pub const IFA_LOCAL: ::c_ushort = 2;
    pub const IFA_LABEL: ::c_ushort = 3;
    pub const IFA_BROADCAST: ::c_ushort = 4;
    pub const IFA_ANYCAST: ::c_ushort = 5;
    pub const IFA_CACHEINFO: ::c_ushort = 6;
    pub const IFA_MULTICAST: ::c_ushort = 7;

    pub const IFA_F_SECONDARY: u32 = 0x01;
    pub const IFA_F_TEMPORARY: u32 = 0x01;
    pub const IFA_F_NODAD: u32 = 0x02;
    pub const IFA_F_OPTIMISTIC: u32 = 0x04;
    pub const IFA_F_DADFAILED: u32 = 0x08;
    pub const IFA_F_HOMEADDRESS: u32 = 0x10;
    pub const IFA_F_DEPRECATED: u32 = 0x20;
    pub const IFA_F_TENTATIVE: u32 = 0x40;
    pub const IFA_F_PERMANENT: u32 = 0x80;

    // linux/if_link.h
    pub const IFLA_UNSPEC: ::c_ushort = 0;
    pub const IFLA_ADDRESS: ::c_ushort = 1;
    pub const IFLA_BROADCAST: ::c_ushort = 2;
    pub const IFLA_IFNAME: ::c_ushort = 3;
    pub const IFLA_MTU: ::c_ushort = 4;
    pub const IFLA_LINK: ::c_ushort = 5;
    pub const IFLA_QDISC: ::c_ushort = 6;
    pub const IFLA_STATS: ::c_ushort = 7;

    // linux/if_tun.h
    pub const IFF_TUN: ::c_int = 0x0001;
    pub const IFF_TAP: ::c_int = 0x0002;
    pub const IFF_NO_PI: ::c_int = 0x1000;
    // Read queue size
    pub const TUN_READQ_SIZE: ::c_short = 500;
    // TUN device type flags: deprecated. Use IFF_TUN/IFF_TAP instead.
    pub const TUN_TUN_DEV: ::c_short   = ::IFF_TUN as ::c_short;
    pub const TUN_TAP_DEV: ::c_short   = ::IFF_TAP as ::c_short;
    pub const TUN_TYPE_MASK: ::c_short = 0x000f;
    // This flag has no real effect
    pub const IFF_ONE_QUEUE: ::c_int    = 0x2000;
    pub const IFF_VNET_HDR: ::c_int     = 0x4000;
    pub const IFF_TUN_EXCL: ::c_int     = 0x8000;
    pub const IFF_MULTI_QUEUE: ::c_int  = 0x0100;
    pub const IFF_ATTACH_QUEUE: ::c_int = 0x0200;
    pub const IFF_DETACH_QUEUE: ::c_int = 0x0400;
    // read-only flag
    pub const IFF_PERSIST: ::c_int  = 0x0800;
    pub const IFF_NOFILTER: ::c_int = 0x1000;

    pub const ST_RDONLY: ::c_ulong = 1;
    pub const ST_NOSUID: ::c_ulong = 2;
    pub const ST_NODEV: ::c_ulong = 4;
    pub const ST_NOEXEC: ::c_ulong = 8;
    pub const ST_SYNCHRONOUS: ::c_ulong = 16;
    pub const ST_MANDLOCK: ::c_ulong = 64;
    pub const ST_WRITE: ::c_ulong = 128;
    pub const ST_APPEND: ::c_ulong = 256;
    pub const ST_IMMUTABLE: ::c_ulong = 512;
    pub const ST_NOATIME: ::c_ulong = 1024;
    pub const ST_NODIRATIME: ::c_ulong = 2048;

    pub const RTLD_NEXT: *mut ::c_void = -1i64 as *mut ::c_void;
    pub const RTLD_DEFAULT: *mut ::c_void = 0i64 as *mut ::c_void;
    pub const RTLD_NODELETE: ::c_int = 0x1000;
    pub const RTLD_NOW: ::c_int = 0x2;

    pub const TCP_MD5SIG: ::c_int = 14;

    align_const! {
        pub const PTHREAD_MUTEX_INITIALIZER: pthread_mutex_t = pthread_mutex_t {
            size: [0; __SIZEOF_PTHREAD_MUTEX_T],
        };
        pub const PTHREAD_COND_INITIALIZER: pthread_cond_t = pthread_cond_t {
            size: [0; __SIZEOF_PTHREAD_COND_T],
        };
        pub const PTHREAD_RWLOCK_INITIALIZER: pthread_rwlock_t = pthread_rwlock_t {
            size: [0; __SIZEOF_PTHREAD_RWLOCK_T],
        };
    }
    pub const PTHREAD_MUTEX_NORMAL: ::c_int = 0;
    pub const PTHREAD_MUTEX_RECURSIVE: ::c_int = 1;
    pub const PTHREAD_MUTEX_ERRORCHECK: ::c_int = 2;
    pub const PTHREAD_MUTEX_DEFAULT: ::c_int = PTHREAD_MUTEX_NORMAL;
    pub const PTHREAD_PROCESS_PRIVATE: ::c_int = 0;
    pub const PTHREAD_PROCESS_SHARED: ::c_int = 1;
    pub const __SIZEOF_PTHREAD_COND_T: usize = 48;

    pub const RENAME_NOREPLACE: ::c_int = 1;
    pub const RENAME_EXCHANGE: ::c_int = 2;
    pub const RENAME_WHITEOUT: ::c_int = 4;

    pub const SCHED_OTHER: ::c_int = 0;
    pub const SCHED_FIFO: ::c_int = 1;
    pub const SCHED_RR: ::c_int = 2;
    pub const SCHED_BATCH: ::c_int = 3;
    pub const SCHED_IDLE: ::c_int = 5;

    // netinet/in.h
    // NOTE: These are in addition to the constants defined in src/unix/mod.rs

    // IPPROTO_IP defined in src/unix/mod.rs
    /// Hop-by-hop option header
    pub const IPPROTO_HOPOPTS: ::c_int = 0;
    // IPPROTO_ICMP defined in src/unix/mod.rs
    /// group mgmt protocol
    pub const IPPROTO_IGMP: ::c_int = 2;
    /// for compatibility
    pub const IPPROTO_IPIP: ::c_int = 4;
    // IPPROTO_TCP defined in src/unix/mod.rs
    /// exterior gateway protocol
    pub const IPPROTO_EGP: ::c_int = 8;
    /// pup
    pub const IPPROTO_PUP: ::c_int = 12;
    // IPPROTO_UDP defined in src/unix/mod.rs
    /// xns idp
    pub const IPPROTO_IDP: ::c_int = 22;
    /// tp-4 w/ class negotiation
    pub const IPPROTO_TP: ::c_int = 29;
    /// DCCP
    pub const IPPROTO_DCCP: ::c_int = 33;
    // IPPROTO_IPV6 defined in src/unix/mod.rs
    /// IP6 routing header
    pub const IPPROTO_ROUTING: ::c_int = 43;
    /// IP6 fragmentation header
    pub const IPPROTO_FRAGMENT: ::c_int = 44;
    /// resource reservation
    pub const IPPROTO_RSVP: ::c_int = 46;
    /// General Routing Encap.
    pub const IPPROTO_GRE: ::c_int = 47;
    /// IP6 Encap Sec. Payload
    pub const IPPROTO_ESP: ::c_int = 50;
    /// IP6 Auth Header
    pub const IPPROTO_AH: ::c_int = 51;
    // IPPROTO_ICMPV6 defined in src/unix/mod.rs
    /// IP6 no next header
    pub const IPPROTO_NONE: ::c_int = 59;
    /// IP6 destination option
    pub const IPPROTO_DSTOPTS: ::c_int = 60;
    pub const IPPROTO_MTP: ::c_int = 92;
    pub const IPPROTO_BEETPH: ::c_int = 94;
    /// encapsulation header
    pub const IPPROTO_ENCAP: ::c_int = 98;
    /// Protocol indep. multicast
    pub const IPPROTO_PIM: ::c_int = 103;
    /// IP Payload Comp. Protocol
    pub const IPPROTO_COMP: ::c_int = 108;
    /// SCTP
    pub const IPPROTO_SCTP: ::c_int = 132;
    pub const IPPROTO_MH: ::c_int = 135;
    pub const IPPROTO_UDPLITE: ::c_int = 136;
    pub const IPPROTO_MPLS: ::c_int = 137;
    /// raw IP packet
    pub const IPPROTO_RAW: ::c_int = 255;
    pub const IPPROTO_MAX: ::c_int = 256;

    pub const AF_IB: ::c_int = 27;
    pub const AF_MPLS: ::c_int = 28;
    pub const AF_NFC: ::c_int = 39;
    pub const AF_VSOCK: ::c_int = 40;
    pub const AF_XDP: ::c_int = 44;
    pub const PF_IB: ::c_int = AF_IB;
    pub const PF_MPLS: ::c_int = AF_MPLS;
    pub const PF_NFC: ::c_int = AF_NFC;
    pub const PF_VSOCK: ::c_int = AF_VSOCK;
    pub const PF_XDP: ::c_int = AF_XDP;

    // System V IPC
    pub const IPC_PRIVATE: ::key_t = 0;

    pub const IPC_CREAT: ::c_int = 0o1000;
    pub const IPC_EXCL: ::c_int = 0o2000;
    pub const IPC_NOWAIT: ::c_int = 0o4000;

    pub const IPC_RMID: ::c_int = 0;
    pub const IPC_SET: ::c_int = 1;
    pub const IPC_STAT: ::c_int = 2;
    pub const IPC_INFO: ::c_int = 3;
    pub const MSG_STAT: ::c_int = 11;
    pub const MSG_INFO: ::c_int = 12;

    pub const MSG_NOERROR: ::c_int = 0o10000;
    pub const MSG_EXCEPT: ::c_int = 0o20000;
    pub const MSG_COPY: ::c_int = 0o40000;

    pub const SHM_R: ::c_int = 0o400;
    pub const SHM_W: ::c_int = 0o200;

    pub const SHM_RDONLY: ::c_int = 0o10000;
    pub const SHM_RND: ::c_int = 0o20000;
    pub const SHM_REMAP: ::c_int = 0o40000;
    pub const SHM_EXEC: ::c_int = 0o100000;

    pub const SHM_LOCK: ::c_int = 11;
    pub const SHM_UNLOCK: ::c_int = 12;

    pub const SHM_HUGETLB: ::c_int = 0o4000;
    pub const SHM_NORESERVE: ::c_int = 0o10000;

    pub const EPOLLRDHUP: ::c_int = 0x2000;
    pub const EPOLLEXCLUSIVE: ::c_int = 0x10000000;
    pub const EPOLLONESHOT: ::c_int = 0x40000000;

    pub const QFMT_VFS_OLD: ::c_int = 1;
    pub const QFMT_VFS_V0: ::c_int = 2;
    pub const QFMT_VFS_V1: ::c_int = 4;

    pub const EFD_SEMAPHORE: ::c_int = 0x1;

    pub const LOG_NFACILITIES: ::c_int = 24;

    pub const SEM_FAILED: *mut ::sem_t = 0 as *mut sem_t;

    pub const RB_AUTOBOOT: ::c_int = 0x01234567u32 as i32;
    pub const RB_HALT_SYSTEM: ::c_int = 0xcdef0123u32 as i32;
    pub const RB_ENABLE_CAD: ::c_int = 0x89abcdefu32 as i32;
    pub const RB_DISABLE_CAD: ::c_int = 0x00000000u32 as i32;
    pub const RB_POWER_OFF: ::c_int = 0x4321fedcu32 as i32;
    pub const RB_SW_SUSPEND: ::c_int = 0xd000fce2u32 as i32;
    pub const RB_KEXEC: ::c_int = 0x45584543u32 as i32;

    pub const AI_PASSIVE: ::c_int = 0x0001;
    pub const AI_CANONNAME: ::c_int = 0x0002;
    pub const AI_NUMERICHOST: ::c_int = 0x0004;
    pub const AI_V4MAPPED: ::c_int = 0x0008;
    pub const AI_ALL: ::c_int = 0x0010;
    pub const AI_ADDRCONFIG: ::c_int = 0x0020;

    pub const AI_NUMERICSERV: ::c_int = 0x0400;

    pub const EAI_BADFLAGS: ::c_int = -1;
    pub const EAI_NONAME: ::c_int = -2;
    pub const EAI_AGAIN: ::c_int = -3;
    pub const EAI_FAIL: ::c_int = -4;
    pub const EAI_NODATA: ::c_int = -5;
    pub const EAI_FAMILY: ::c_int = -6;
    pub const EAI_SOCKTYPE: ::c_int = -7;
    pub const EAI_SERVICE: ::c_int = -8;
    pub const EAI_MEMORY: ::c_int = -10;
    pub const EAI_SYSTEM: ::c_int = -11;
    pub const EAI_OVERFLOW: ::c_int = -12;

    pub const NI_NUMERICHOST: ::c_int = 1;
    pub const NI_NUMERICSERV: ::c_int = 2;
    pub const NI_NOFQDN: ::c_int = 4;
    pub const NI_NAMEREQD: ::c_int = 8;
    pub const NI_DGRAM: ::c_int = 16;

    pub const SYNC_FILE_RANGE_WAIT_BEFORE: ::c_uint = 1;
    pub const SYNC_FILE_RANGE_WRITE: ::c_uint = 2;
    pub const SYNC_FILE_RANGE_WAIT_AFTER: ::c_uint = 4;

    pub const AIO_CANCELED: ::c_int = 0;
    pub const AIO_NOTCANCELED: ::c_int = 1;
    pub const AIO_ALLDONE: ::c_int = 2;
    pub const LIO_READ: ::c_int = 0;
    pub const LIO_WRITE: ::c_int = 1;
    pub const LIO_NOP: ::c_int = 2;
    pub const LIO_WAIT: ::c_int = 0;
    pub const LIO_NOWAIT: ::c_int = 1;

    pub const MREMAP_MAYMOVE: ::c_int = 1;
    pub const MREMAP_FIXED: ::c_int = 2;

    pub const PR_SET_PDEATHSIG: ::c_int = 1;
    pub const PR_GET_PDEATHSIG: ::c_int = 2;

    pub const PR_GET_DUMPABLE: ::c_int = 3;
    pub const PR_SET_DUMPABLE: ::c_int = 4;

    pub const PR_GET_UNALIGN: ::c_int = 5;
    pub const PR_SET_UNALIGN: ::c_int = 6;
    pub const PR_UNALIGN_NOPRINT: ::c_int = 1;
    pub const PR_UNALIGN_SIGBUS: ::c_int = 2;

    pub const PR_GET_KEEPCAPS: ::c_int = 7;
    pub const PR_SET_KEEPCAPS: ::c_int = 8;

    pub const PR_GET_FPEMU: ::c_int = 9;
    pub const PR_SET_FPEMU: ::c_int = 10;
    pub const PR_FPEMU_NOPRINT: ::c_int = 1;
    pub const PR_FPEMU_SIGFPE: ::c_int = 2;

    pub const PR_GET_FPEXC: ::c_int = 11;
    pub const PR_SET_FPEXC: ::c_int = 12;
    pub const PR_FP_EXC_SW_ENABLE: ::c_int = 0x80;
    pub const PR_FP_EXC_DIV: ::c_int = 0x010000;
    pub const PR_FP_EXC_OVF: ::c_int = 0x020000;
    pub const PR_FP_EXC_UND: ::c_int = 0x040000;
    pub const PR_FP_EXC_RES: ::c_int = 0x080000;
    pub const PR_FP_EXC_INV: ::c_int = 0x100000;
    pub const PR_FP_EXC_DISABLED: ::c_int = 0;
    pub const PR_FP_EXC_NONRECOV: ::c_int = 1;
    pub const PR_FP_EXC_ASYNC: ::c_int = 2;
    pub const PR_FP_EXC_PRECISE: ::c_int = 3;

    pub const PR_GET_TIMING: ::c_int = 13;
    pub const PR_SET_TIMING: ::c_int = 14;
    pub const PR_TIMING_STATISTICAL: ::c_int = 0;
    pub const PR_TIMING_TIMESTAMP: ::c_int = 1;

    pub const PR_SET_NAME: ::c_int = 15;
    pub const PR_GET_NAME: ::c_int = 16;

    pub const PR_GET_ENDIAN: ::c_int = 19;
    pub const PR_SET_ENDIAN: ::c_int = 20;
    pub const PR_ENDIAN_BIG: ::c_int = 0;
    pub const PR_ENDIAN_LITTLE: ::c_int = 1;
    pub const PR_ENDIAN_PPC_LITTLE: ::c_int = 2;

    pub const PR_GET_SECCOMP: ::c_int = 21;
    pub const PR_SET_SECCOMP: ::c_int = 22;

    pub const PR_CAPBSET_READ: ::c_int = 23;
    pub const PR_CAPBSET_DROP: ::c_int = 24;

    pub const PR_GET_TSC: ::c_int = 25;
    pub const PR_SET_TSC: ::c_int = 26;
    pub const PR_TSC_ENABLE: ::c_int = 1;
    pub const PR_TSC_SIGSEGV: ::c_int = 2;

    pub const PR_GET_SECUREBITS: ::c_int = 27;
    pub const PR_SET_SECUREBITS: ::c_int = 28;

    pub const PR_SET_TIMERSLACK: ::c_int = 29;
    pub const PR_GET_TIMERSLACK: ::c_int = 30;

    pub const PR_TASK_PERF_EVENTS_DISABLE: ::c_int = 31;
    pub const PR_TASK_PERF_EVENTS_ENABLE: ::c_int = 32;

    pub const PR_MCE_KILL: ::c_int = 33;
    pub const PR_MCE_KILL_CLEAR: ::c_int = 0;
    pub const PR_MCE_KILL_SET: ::c_int = 1;

    pub const PR_MCE_KILL_LATE: ::c_int = 0;
    pub const PR_MCE_KILL_EARLY: ::c_int = 1;
    pub const PR_MCE_KILL_DEFAULT: ::c_int = 2;

    pub const PR_MCE_KILL_GET: ::c_int = 34;

    pub const PR_SET_MM: ::c_int = 35;
    pub const PR_SET_MM_START_CODE: ::c_int = 1;
    pub const PR_SET_MM_END_CODE: ::c_int = 2;
    pub const PR_SET_MM_START_DATA: ::c_int = 3;
    pub const PR_SET_MM_END_DATA: ::c_int = 4;
    pub const PR_SET_MM_START_STACK: ::c_int = 5;
    pub const PR_SET_MM_START_BRK: ::c_int = 6;
    pub const PR_SET_MM_BRK: ::c_int = 7;
    pub const PR_SET_MM_ARG_START: ::c_int = 8;
    pub const PR_SET_MM_ARG_END: ::c_int = 9;
    pub const PR_SET_MM_ENV_START: ::c_int = 10;
    pub const PR_SET_MM_ENV_END: ::c_int = 11;
    pub const PR_SET_MM_AUXV: ::c_int = 12;
    pub const PR_SET_MM_EXE_FILE: ::c_int = 13;
    pub const PR_SET_MM_MAP: ::c_int = 14;
    pub const PR_SET_MM_MAP_SIZE: ::c_int = 15;

    pub const PR_SET_PTRACER: ::c_int = 0x59616d61;

    pub const PR_SET_CHILD_SUBREAPER: ::c_int = 36;
    pub const PR_GET_CHILD_SUBREAPER: ::c_int = 37;

    pub const PR_SET_NO_NEW_PRIVS: ::c_int = 38;
    pub const PR_GET_NO_NEW_PRIVS: ::c_int = 39;

    pub const PR_GET_TID_ADDRESS: ::c_int = 40;

    pub const PR_SET_THP_DISABLE: ::c_int = 41;
    pub const PR_GET_THP_DISABLE: ::c_int = 42;

    pub const PR_MPX_ENABLE_MANAGEMENT: ::c_int = 43;
    pub const PR_MPX_DISABLE_MANAGEMENT: ::c_int = 44;

    pub const PR_SET_FP_MODE: ::c_int = 45;
    pub const PR_GET_FP_MODE: ::c_int = 46;
    pub const PR_FP_MODE_FR: ::c_int = 1 << 0;
    pub const PR_FP_MODE_FRE: ::c_int = 1 << 1;

    pub const PR_CAP_AMBIENT: ::c_int = 47;
    pub const PR_CAP_AMBIENT_IS_SET: ::c_int = 1;
    pub const PR_CAP_AMBIENT_RAISE: ::c_int = 2;
    pub const PR_CAP_AMBIENT_LOWER: ::c_int = 3;
    pub const PR_CAP_AMBIENT_CLEAR_ALL: ::c_int = 4;

    pub const GRND_NONBLOCK: ::c_uint = 0x0001;
    pub const GRND_RANDOM: ::c_uint = 0x0002;

    pub const SECCOMP_MODE_DISABLED: ::c_uint = 0;
    pub const SECCOMP_MODE_STRICT: ::c_uint = 1;
    pub const SECCOMP_MODE_FILTER: ::c_uint = 2;

    pub const ITIMER_REAL: ::c_int = 0;
    pub const ITIMER_VIRTUAL: ::c_int = 1;
    pub const ITIMER_PROF: ::c_int = 2;

    pub const TFD_CLOEXEC: ::c_int = O_CLOEXEC;
    pub const TFD_NONBLOCK: ::c_int = O_NONBLOCK;
    pub const TFD_TIMER_ABSTIME: ::c_int = 1;

    pub const XATTR_CREATE: ::c_int = 0x1;
    pub const XATTR_REPLACE: ::c_int = 0x2;

    pub const _POSIX_VDISABLE: ::cc_t = 0;

    pub const FALLOC_FL_KEEP_SIZE: ::c_int = 0x01;
    pub const FALLOC_FL_PUNCH_HOLE: ::c_int = 0x02;
    pub const FALLOC_FL_COLLAPSE_RANGE: ::c_int = 0x08;
    pub const FALLOC_FL_ZERO_RANGE: ::c_int = 0x10;
    pub const FALLOC_FL_INSERT_RANGE: ::c_int = 0x20;
    pub const FALLOC_FL_UNSHARE_RANGE: ::c_int = 0x40;

    #[deprecated(
        since = "0.2.55",
        note = "ENOATTR is not available on Linux; use ENODATA instead"
    )]
    pub const ENOATTR: ::c_int = ::ENODATA;

    pub const SO_ORIGINAL_DST: ::c_int = 80;
    pub const IP_ORIGDSTADDR : ::c_int = 20;
    pub const IP_RECVORIGDSTADDR : ::c_int = IP_ORIGDSTADDR;
    pub const IPV6_ORIGDSTADDR : ::c_int = 74;
    pub const IPV6_RECVORIGDSTADDR : ::c_int = IPV6_ORIGDSTADDR;
    pub const IPV6_FLOWINFO: ::c_int = 11;
    pub const IPV6_FLOWLABEL_MGR: ::c_int = 32;
    pub const IPV6_FLOWINFO_SEND: ::c_int = 33;
    pub const IPV6_FLOWINFO_FLOWLABEL: ::c_int = 0x000fffff;
    pub const IPV6_FLOWINFO_PRIORITY: ::c_int = 0x0ff00000;
    pub const IUTF8: ::tcflag_t = 0x00004000;
    pub const CMSPAR: ::tcflag_t = 0o10000000000;

    pub const MFD_CLOEXEC: ::c_uint = 0x0001;
    pub const MFD_ALLOW_SEALING: ::c_uint = 0x0002;
    pub const MFD_HUGETLB: ::c_uint = 0x0004;

    // these are used in the p_type field of Elf32_Phdr and Elf64_Phdr, which has
    // the type Elf32Word and Elf64Word respectively. Luckily, both of those are u32
    // so we can use that type here to avoid having to cast.
    pub const PT_NULL: u32 = 0;
    pub const PT_LOAD: u32 = 1;
    pub const PT_DYNAMIC: u32 = 2;
    pub const PT_INTERP: u32 = 3;
    pub const PT_NOTE: u32 = 4;
    pub const PT_SHLIB: u32 = 5;
    pub const PT_PHDR: u32 = 6;
    pub const PT_TLS: u32 = 7;
    pub const PT_NUM: u32 = 8;
    pub const PT_LOOS: u32 = 0x60000000;
    pub const PT_GNU_EH_FRAME: u32 = 0x6474e550;
    pub const PT_GNU_STACK: u32 = 0x6474e551;
    pub const PT_GNU_RELRO: u32 = 0x6474e552;

    // linux/if_ether.h
    pub const ETH_ALEN: ::c_int = 6;
    pub const ETH_HLEN: ::c_int = 14;
    pub const ETH_ZLEN: ::c_int = 60;
    pub const ETH_DATA_LEN: ::c_int = 1500;
    pub const ETH_FRAME_LEN: ::c_int = 1514;
    pub const ETH_FCS_LEN: ::c_int = 4;

    // These are the defined Ethernet Protocol ID's.
    pub const ETH_P_LOOP: ::c_int = 0x0060;
    pub const ETH_P_PUP: ::c_int = 0x0200;
    pub const ETH_P_PUPAT: ::c_int = 0x0201;
    pub const ETH_P_IP: ::c_int = 0x0800;
    pub const ETH_P_X25: ::c_int = 0x0805;
    pub const ETH_P_ARP: ::c_int = 0x0806;
    pub const ETH_P_BPQ: ::c_int = 0x08FF;
    pub const ETH_P_IEEEPUP: ::c_int = 0x0a00;
    pub const ETH_P_IEEEPUPAT: ::c_int = 0x0a01;
    pub const ETH_P_BATMAN: ::c_int = 0x4305;
    pub const ETH_P_DEC: ::c_int = 0x6000;
    pub const ETH_P_DNA_DL: ::c_int = 0x6001;
    pub const ETH_P_DNA_RC: ::c_int = 0x6002;
    pub const ETH_P_DNA_RT: ::c_int = 0x6003;
    pub const ETH_P_LAT: ::c_int = 0x6004;
    pub const ETH_P_DIAG: ::c_int = 0x6005;
    pub const ETH_P_CUST: ::c_int = 0x6006;
    pub const ETH_P_SCA: ::c_int = 0x6007;
    pub const ETH_P_TEB: ::c_int = 0x6558;
    pub const ETH_P_RARP: ::c_int = 0x8035;
    pub const ETH_P_ATALK: ::c_int = 0x809B;
    pub const ETH_P_AARP: ::c_int = 0x80F3;
    pub const ETH_P_8021Q: ::c_int = 0x8100;
    pub const ETH_P_IPX: ::c_int = 0x8137;
    pub const ETH_P_IPV6: ::c_int = 0x86DD;
    pub const ETH_P_PAUSE: ::c_int = 0x8808;
    pub const ETH_P_SLOW: ::c_int = 0x8809;
    pub const ETH_P_WCCP: ::c_int = 0x883E;
    pub const ETH_P_MPLS_UC: ::c_int = 0x8847;
    pub const ETH_P_MPLS_MC: ::c_int = 0x8848;
    pub const ETH_P_ATMMPOA: ::c_int = 0x884c;
    pub const ETH_P_PPP_DISC: ::c_int = 0x8863;
    pub const ETH_P_PPP_SES: ::c_int = 0x8864;
    pub const ETH_P_LINK_CTL: ::c_int = 0x886c;
    pub const ETH_P_ATMFATE: ::c_int = 0x8884;
    pub const ETH_P_PAE: ::c_int = 0x888E;
    pub const ETH_P_AOE: ::c_int = 0x88A2;
    pub const ETH_P_8021AD: ::c_int = 0x88A8;
    pub const ETH_P_802_EX1: ::c_int = 0x88B5;
    pub const ETH_P_TIPC: ::c_int = 0x88CA;
    pub const ETH_P_MACSEC: ::c_int = 0x88E5;
    pub const ETH_P_8021AH: ::c_int = 0x88E7;
    pub const ETH_P_MVRP: ::c_int = 0x88F5;
    pub const ETH_P_1588: ::c_int = 0x88F7;
    pub const ETH_P_PRP: ::c_int = 0x88FB;
    pub const ETH_P_FCOE: ::c_int = 0x8906;
    pub const ETH_P_TDLS: ::c_int = 0x890D;
    pub const ETH_P_FIP: ::c_int = 0x8914;
    pub const ETH_P_80221: ::c_int = 0x8917;
    pub const ETH_P_LOOPBACK: ::c_int = 0x9000;
    pub const ETH_P_QINQ1: ::c_int = 0x9100;
    pub const ETH_P_QINQ2: ::c_int = 0x9200;
    pub const ETH_P_QINQ3: ::c_int = 0x9300;
    pub const ETH_P_EDSA: ::c_int = 0xDADA;
    pub const ETH_P_AF_IUCV: ::c_int = 0xFBFB;

    pub const ETH_P_802_3_MIN: ::c_int = 0x0600;

    // Non DIX types. Won't clash for 1500 types.
    pub const ETH_P_802_3: ::c_int = 0x0001;
    pub const ETH_P_AX25: ::c_int = 0x0002;
    pub const ETH_P_ALL: ::c_int = 0x0003;
    pub const ETH_P_802_2: ::c_int = 0x0004;
    pub const ETH_P_SNAP: ::c_int = 0x0005;
    pub const ETH_P_DDCMP: ::c_int = 0x0006;
    pub const ETH_P_WAN_PPP: ::c_int = 0x0007;
    pub const ETH_P_PPP_MP: ::c_int = 0x0008;
    pub const ETH_P_LOCALTALK: ::c_int = 0x0009;
    pub const ETH_P_CANFD: ::c_int = 0x000D;
    pub const ETH_P_PPPTALK: ::c_int = 0x0010;
    pub const ETH_P_TR_802_2: ::c_int = 0x0011;
    pub const ETH_P_MOBITEX: ::c_int = 0x0015;
    pub const ETH_P_CONTROL: ::c_int = 0x0016;
    pub const ETH_P_IRDA: ::c_int = 0x0017;
    pub const ETH_P_ECONET: ::c_int = 0x0018;
    pub const ETH_P_HDLC: ::c_int = 0x0019;
    pub const ETH_P_ARCNET: ::c_int = 0x001A;
    pub const ETH_P_DSA: ::c_int = 0x001B;
    pub const ETH_P_TRAILER: ::c_int = 0x001C;
    pub const ETH_P_PHONET: ::c_int = 0x00F5;
    pub const ETH_P_IEEE802154: ::c_int = 0x00F6;
    pub const ETH_P_CAIF: ::c_int = 0x00F7;

    pub const POSIX_SPAWN_RESETIDS: ::c_int = 0x01;
    pub const POSIX_SPAWN_SETPGROUP: ::c_int = 0x02;
    pub const POSIX_SPAWN_SETSIGDEF: ::c_int = 0x04;
    pub const POSIX_SPAWN_SETSIGMASK: ::c_int = 0x08;
    pub const POSIX_SPAWN_SETSCHEDPARAM: ::c_int = 0x10;
    pub const POSIX_SPAWN_SETSCHEDULER: ::c_int = 0x20;

    pub const NLMSG_NOOP: ::c_int = 0x1;
    pub const NLMSG_ERROR: ::c_int = 0x2;
    pub const NLMSG_DONE: ::c_int = 0x3;
    pub const NLMSG_OVERRUN: ::c_int = 0x4;
    pub const NLMSG_MIN_TYPE: ::c_int = 0x10;

    pub const GENL_NAMSIZ: ::c_int = 16;

    pub const GENL_MIN_ID: ::c_int = NLMSG_MIN_TYPE;
    pub const GENL_MAX_ID: ::c_int = 1023;

    pub const GENL_ADMIN_PERM: ::c_int = 0x01;
    pub const GENL_CMD_CAP_DO: ::c_int = 0x02;
    pub const GENL_CMD_CAP_DUMP: ::c_int = 0x04;
    pub const GENL_CMD_CAP_HASPOL: ::c_int = 0x08;

    pub const GENL_ID_CTRL: ::c_int = NLMSG_MIN_TYPE;

    pub const CTRL_CMD_UNSPEC: ::c_int = 0;
    pub const CTRL_CMD_NEWFAMILY: ::c_int = 1;
    pub const CTRL_CMD_DELFAMILY: ::c_int = 2;
    pub const CTRL_CMD_GETFAMILY: ::c_int = 3;
    pub const CTRL_CMD_NEWOPS: ::c_int = 4;
    pub const CTRL_CMD_DELOPS: ::c_int = 5;
    pub const CTRL_CMD_GETOPS: ::c_int = 6;
    pub const CTRL_CMD_NEWMCAST_GRP: ::c_int = 7;
    pub const CTRL_CMD_DELMCAST_GRP: ::c_int = 8;
    pub const CTRL_CMD_GETMCAST_GRP: ::c_int = 9;

    pub const CTRL_ATTR_UNSPEC: ::c_int = 0;
    pub const CTRL_ATTR_FAMILY_ID: ::c_int = 1;
    pub const CTRL_ATTR_FAMILY_NAME: ::c_int = 2;
    pub const CTRL_ATTR_VERSION: ::c_int = 3;
    pub const CTRL_ATTR_HDRSIZE: ::c_int = 4;
    pub const CTRL_ATTR_MAXATTR: ::c_int = 5;
    pub const CTRL_ATTR_OPS: ::c_int = 6;
    pub const CTRL_ATTR_MCAST_GROUPS: ::c_int = 7;

    pub const CTRL_ATTR_OP_UNSPEC: ::c_int = 0;
    pub const CTRL_ATTR_OP_ID: ::c_int = 1;
    pub const CTRL_ATTR_OP_FLAGS: ::c_int = 2;

    pub const CTRL_ATTR_MCAST_GRP_UNSPEC: ::c_int = 0;
    pub const CTRL_ATTR_MCAST_GRP_NAME: ::c_int = 1;
    pub const CTRL_ATTR_MCAST_GRP_ID: ::c_int = 2;

    // linux/if_packet.h
    pub const PACKET_ADD_MEMBERSHIP: ::c_int = 1;
    pub const PACKET_DROP_MEMBERSHIP: ::c_int = 2;

    pub const PACKET_MR_MULTICAST: ::c_int = 0;
    pub const PACKET_MR_PROMISC: ::c_int = 1;
    pub const PACKET_MR_ALLMULTI: ::c_int = 2;
    pub const PACKET_MR_UNICAST: ::c_int = 3;

    // linux/netfilter.h
    pub const NF_DROP: ::c_int = 0;
    pub const NF_ACCEPT: ::c_int =  1;
    pub const NF_STOLEN: ::c_int =  2;
    pub const NF_QUEUE: ::c_int =  3;
    pub const NF_REPEAT: ::c_int =  4;
    pub const NF_STOP: ::c_int =  5;
    pub const NF_MAX_VERDICT: ::c_int = NF_STOP;

    pub const NF_VERDICT_MASK: ::c_int = 0x000000ff;
    pub const NF_VERDICT_FLAG_QUEUE_BYPASS: ::c_int = 0x00008000;

    pub const NF_VERDICT_QMASK: ::c_int = 0xffff0000;
    pub const NF_VERDICT_QBITS: ::c_int = 16;

    pub const NF_VERDICT_BITS: ::c_int = 16;

    pub const NF_INET_PRE_ROUTING: ::c_int = 0;
    pub const NF_INET_LOCAL_IN: ::c_int = 1;
    pub const NF_INET_FORWARD: ::c_int = 2;
    pub const NF_INET_LOCAL_OUT: ::c_int = 3;
    pub const NF_INET_POST_ROUTING: ::c_int = 4;
    pub const NF_INET_NUMHOOKS: ::c_int = 5;

    // Some NFPROTO are not compatible with musl and are defined in submodules.
    pub const NFPROTO_UNSPEC: ::c_int = 0;
    pub const NFPROTO_IPV4: ::c_int = 2;
    pub const NFPROTO_ARP: ::c_int = 3;
    pub const NFPROTO_BRIDGE: ::c_int = 7;
    pub const NFPROTO_IPV6: ::c_int = 10;
    pub const NFPROTO_DECNET: ::c_int = 12;
    pub const NFPROTO_NUMPROTO: ::c_int = 13;

    // linux/netfilter_ipv4.h
    pub const NF_IP_PRE_ROUTING: ::c_int = 0;
    pub const NF_IP_LOCAL_IN: ::c_int = 1;
    pub const NF_IP_FORWARD: ::c_int = 2;
    pub const NF_IP_LOCAL_OUT: ::c_int = 3;
    pub const NF_IP_POST_ROUTING: ::c_int = 4;
    pub const NF_IP_NUMHOOKS: ::c_int = 5;

    pub const NF_IP_PRI_FIRST: ::c_int = ::INT_MIN;
    pub const NF_IP_PRI_CONNTRACK_DEFRAG: ::c_int = -400;
    pub const NF_IP_PRI_RAW: ::c_int = -300;
    pub const NF_IP_PRI_SELINUX_FIRST: ::c_int = -225;
    pub const NF_IP_PRI_CONNTRACK: ::c_int = -200;
    pub const NF_IP_PRI_MANGLE: ::c_int = -150;
    pub const NF_IP_PRI_NAT_DST: ::c_int = -100;
    pub const NF_IP_PRI_FILTER: ::c_int = 0;
    pub const NF_IP_PRI_SECURITY: ::c_int = 50;
    pub const NF_IP_PRI_NAT_SRC: ::c_int = 100;
    pub const NF_IP_PRI_SELINUX_LAST: ::c_int = 225;
    pub const NF_IP_PRI_CONNTRACK_HELPER: ::c_int = 300;
    pub const NF_IP_PRI_CONNTRACK_CONFIRM: ::c_int = ::INT_MAX;
    pub const NF_IP_PRI_LAST: ::c_int = ::INT_MAX;

    // linux/netfilter_ipv6.h
    pub const NF_IP6_PRE_ROUTING: ::c_int = 0;
    pub const NF_IP6_LOCAL_IN: ::c_int = 1;
    pub const NF_IP6_FORWARD: ::c_int = 2;
    pub const NF_IP6_LOCAL_OUT: ::c_int = 3;
    pub const NF_IP6_POST_ROUTING: ::c_int = 4;
    pub const NF_IP6_NUMHOOKS: ::c_int = 5;

    pub const NF_IP6_PRI_FIRST: ::c_int = ::INT_MIN;
    pub const NF_IP6_PRI_CONNTRACK_DEFRAG: ::c_int = -400;
    pub const NF_IP6_PRI_RAW: ::c_int = -300;
    pub const NF_IP6_PRI_SELINUX_FIRST: ::c_int = -225;
    pub const NF_IP6_PRI_CONNTRACK: ::c_int = -200;
    pub const NF_IP6_PRI_MANGLE: ::c_int = -150;
    pub const NF_IP6_PRI_NAT_DST: ::c_int = -100;
    pub const NF_IP6_PRI_FILTER: ::c_int = 0;
    pub const NF_IP6_PRI_SECURITY: ::c_int = 50;
    pub const NF_IP6_PRI_NAT_SRC: ::c_int = 100;
    pub const NF_IP6_PRI_SELINUX_LAST: ::c_int = 225;
    pub const NF_IP6_PRI_CONNTRACK_HELPER: ::c_int = 300;
    pub const NF_IP6_PRI_LAST: ::c_int = ::INT_MAX;

    pub const SIOCADDRT: ::c_ulong = 0x0000890B;
    pub const SIOCDELRT: ::c_ulong = 0x0000890C;
    pub const SIOCGIFNAME: ::c_ulong = 0x00008910;
    pub const SIOCSIFLINK: ::c_ulong = 0x00008911;
    pub const SIOCGIFCONF: ::c_ulong = 0x00008912;
    pub const SIOCGIFFLAGS: ::c_ulong = 0x00008913;
    pub const SIOCSIFFLAGS: ::c_ulong = 0x00008914;
    pub const SIOCGIFADDR: ::c_ulong = 0x00008915;
    pub const SIOCSIFADDR: ::c_ulong = 0x00008916;
    pub const SIOCGIFDSTADDR: ::c_ulong = 0x00008917;
    pub const SIOCSIFDSTADDR: ::c_ulong = 0x00008918;
    pub const SIOCGIFBRDADDR: ::c_ulong = 0x00008919;
    pub const SIOCSIFBRDADDR: ::c_ulong = 0x0000891A;
    pub const SIOCGIFNETMASK: ::c_ulong = 0x0000891B;
    pub const SIOCSIFNETMASK: ::c_ulong = 0x0000891C;
    pub const SIOCGIFMETRIC: ::c_ulong = 0x0000891D;
    pub const SIOCSIFMETRIC: ::c_ulong = 0x0000891E;
    pub const SIOCGIFMEM: ::c_ulong = 0x0000891F;
    pub const SIOCSIFMEM: ::c_ulong = 0x00008920;
    pub const SIOCGIFMTU: ::c_ulong = 0x00008921;
    pub const SIOCSIFMTU: ::c_ulong = 0x00008922;
    pub const SIOCSIFHWADDR: ::c_ulong = 0x00008924;
    pub const SIOCGIFENCAP: ::c_ulong = 0x00008925;
    pub const SIOCSIFENCAP: ::c_ulong = 0x00008926;
    pub const SIOCGIFHWADDR: ::c_ulong = 0x00008927;
    pub const SIOCGIFSLAVE: ::c_ulong = 0x00008929;
    pub const SIOCSIFSLAVE: ::c_ulong = 0x00008930;
    pub const SIOCADDMULTI: ::c_ulong = 0x00008931;
    pub const SIOCDELMULTI: ::c_ulong = 0x00008932;
    pub const SIOCDARP: ::c_ulong = 0x00008953;
    pub const SIOCGARP: ::c_ulong = 0x00008954;
    pub const SIOCSARP: ::c_ulong = 0x00008955;
    pub const SIOCDRARP: ::c_ulong = 0x00008960;
    pub const SIOCGRARP: ::c_ulong = 0x00008961;
    pub const SIOCSRARP: ::c_ulong = 0x00008962;
    pub const SIOCGIFMAP: ::c_ulong = 0x00008970;
    pub const SIOCSIFMAP: ::c_ulong = 0x00008971;

    pub const IPTOS_TOS_MASK: u8 = 0x1E;
    pub const IPTOS_PREC_MASK: u8 = 0xE0;

    pub const IPTOS_ECN_NOT_ECT: u8 = 0x00;

    pub const RTF_UP: ::c_ushort = 0x0001;
    pub const RTF_GATEWAY: ::c_ushort = 0x0002;

    pub const RTF_HOST: ::c_ushort = 0x0004;
    pub const RTF_REINSTATE: ::c_ushort = 0x0008;
    pub const RTF_DYNAMIC: ::c_ushort = 0x0010;
    pub const RTF_MODIFIED: ::c_ushort = 0x0020;
    pub const RTF_MTU: ::c_ushort = 0x0040;
    pub const RTF_MSS: ::c_ushort = RTF_MTU;
    pub const RTF_WINDOW: ::c_ushort = 0x0080;
    pub const RTF_IRTT: ::c_ushort = 0x0100;
    pub const RTF_REJECT: ::c_ushort = 0x0200;
    pub const RTF_STATIC: ::c_ushort = 0x0400;
    pub const RTF_XRESOLVE: ::c_ushort = 0x0800;
    pub const RTF_NOFORWARD: ::c_ushort = 0x1000;
    pub const RTF_THROW: ::c_ushort = 0x2000;
    pub const RTF_NOPMTUDISC: ::c_ushort = 0x4000;

    pub const RTF_DEFAULT: u32 = 0x00010000;
    pub const RTF_ALLONLINK: u32 = 0x00020000;
    pub const RTF_ADDRCONF: u32 = 0x00040000;
    pub const RTF_LINKRT: u32 = 0x00100000;
    pub const RTF_NONEXTHOP: u32 = 0x00200000;
    pub const RTF_CACHE: u32 = 0x01000000;
    pub const RTF_FLOW: u32 = 0x02000000;
    pub const RTF_POLICY: u32 = 0x04000000;

    pub const RTCF_VALVE: u32 = 0x00200000;
    pub const RTCF_MASQ: u32 = 0x00400000;
    pub const RTCF_NAT: u32 = 0x00800000;
    pub const RTCF_DOREDIRECT: u32 = 0x01000000;
    pub const RTCF_LOG: u32 = 0x02000000;
    pub const RTCF_DIRECTSRC: u32 = 0x04000000;

    pub const RTF_LOCAL: u32 = 0x80000000;
    pub const RTF_INTERFACE: u32 = 0x40000000;
    pub const RTF_MULTICAST: u32 = 0x20000000;
    pub const RTF_BROADCAST: u32 = 0x10000000;
    pub const RTF_NAT: u32 = 0x08000000;
    pub const RTF_ADDRCLASSMASK: u32 = 0xF8000000;

    pub const RT_CLASS_UNSPEC: u8 = 0;
    pub const RT_CLASS_DEFAULT: u8 = 253;
    pub const RT_CLASS_MAIN: u8 = 254;
    pub const RT_CLASS_LOCAL: u8 = 255;
    pub const RT_CLASS_MAX: u8 = 255;

    // linux/neighbor.h
    pub const NUD_NONE: u16 = 0x00;
    pub const NUD_INCOMPLETE: u16 = 0x01;
    pub const NUD_REACHABLE: u16 = 0x02;
    pub const NUD_STALE: u16 = 0x04;
    pub const NUD_DELAY: u16 = 0x08;
    pub const NUD_PROBE: u16 = 0x10;
    pub const NUD_FAILED: u16 = 0x20;
    pub const NUD_NOARP: u16 = 0x40;
    pub const NUD_PERMANENT: u16 = 0x80;

    pub const NTF_USE: u8 = 0x01;
    pub const NTF_SELF: u8 = 0x02;
    pub const NTF_MASTER: u8 = 0x04;
    pub const NTF_PROXY: u8 = 0x08;
    pub const NTF_ROUTER: u8 = 0x80;

    pub const NDA_UNSPEC: ::c_ushort = 0;
    pub const NDA_DST: ::c_ushort = 1;
    pub const NDA_LLADDR: ::c_ushort = 2;
    pub const NDA_CACHEINFO: ::c_ushort = 3;
    pub const NDA_PROBES: ::c_ushort = 4;
    pub const NDA_VLAN: ::c_ushort = 5;
    pub const NDA_PORT: ::c_ushort = 6;
    pub const NDA_VNI: ::c_ushort = 7;
    pub const NDA_IFINDEX: ::c_ushort = 8;

    // linux/rtnetlink.h
    pub const TCA_UNSPEC: ::c_ushort = 0;
    pub const TCA_KIND: ::c_ushort = 1;
    pub const TCA_OPTIONS: ::c_ushort = 2;
    pub const TCA_STATS: ::c_ushort = 3;
    pub const TCA_XSTATS: ::c_ushort = 4;
    pub const TCA_RATE: ::c_ushort = 5;
    pub const TCA_FCNT: ::c_ushort = 6;
    pub const TCA_STATS2: ::c_ushort = 7;
    pub const TCA_STAB: ::c_ushort = 8;

    pub const RTM_NEWLINK: u16 = 16;
    pub const RTM_DELLINK: u16 = 17;
    pub const RTM_GETLINK: u16 = 18;
    pub const RTM_SETLINK: u16 = 19;
    pub const RTM_NEWADDR: u16 = 20;
    pub const RTM_DELADDR: u16 = 21;
    pub const RTM_GETADDR: u16 = 22;
    pub const RTM_NEWROUTE: u16 = 24;
    pub const RTM_DELROUTE: u16 = 25;
    pub const RTM_GETROUTE: u16 = 26;
    pub const RTM_NEWNEIGH: u16 = 28;
    pub const RTM_DELNEIGH: u16 = 29;
    pub const RTM_GETNEIGH: u16 = 30;
    pub const RTM_NEWRULE: u16 = 32;
    pub const RTM_DELRULE: u16 = 33;
    pub const RTM_GETRULE: u16 = 34;
    pub const RTM_NEWQDISC: u16 = 36;
    pub const RTM_DELQDISC: u16 = 37;
    pub const RTM_GETQDISC: u16 = 38;
    pub const RTM_NEWTCLASS: u16 = 40;
    pub const RTM_DELTCLASS: u16 = 41;
    pub const RTM_GETTCLASS: u16 = 42;
    pub const RTM_NEWTFILTER: u16 = 44;
    pub const RTM_DELTFILTER: u16 = 45;
    pub const RTM_GETTFILTER: u16 = 46;
    pub const RTM_NEWACTION: u16 = 48;
    pub const RTM_DELACTION: u16 = 49;
    pub const RTM_GETACTION: u16 = 50;
    pub const RTM_NEWPREFIX: u16 = 52;
    pub const RTM_GETMULTICAST: u16 = 58;
    pub const RTM_GETANYCAST: u16 = 62;
    pub const RTM_NEWNEIGHTBL: u16 = 64;
    pub const RTM_GETNEIGHTBL: u16 = 66;
    pub const RTM_SETNEIGHTBL: u16 = 67;
    pub const RTM_NEWNDUSEROPT: u16 = 68;
    pub const RTM_NEWADDRLABEL: u16 = 72;
    pub const RTM_DELADDRLABEL: u16 = 73;
    pub const RTM_GETADDRLABEL: u16 = 74;
    pub const RTM_GETDCB: u16 = 78;
    pub const RTM_SETDCB: u16 = 79;
    pub const RTM_NEWNETCONF: u16 = 80;
    pub const RTM_GETNETCONF: u16 = 82;
    pub const RTM_NEWMDB: u16 = 84;
    pub const RTM_DELMDB: u16 = 85;
    pub const RTM_GETMDB: u16 = 86;
    pub const RTM_NEWNSID: u16 = 88;
    pub const RTM_DELNSID: u16 = 89;
    pub const RTM_GETNSID: u16 = 90;

    pub const RTM_F_NOTIFY: ::c_uint = 0x100;
    pub const RTM_F_CLONED: ::c_uint = 0x200;
    pub const RTM_F_EQUALIZE: ::c_uint = 0x400;
    pub const RTM_F_PREFIX: ::c_uint = 0x800;

    pub const RTA_UNSPEC: ::c_ushort = 0;
    pub const RTA_DST: ::c_ushort = 1;
    pub const RTA_SRC: ::c_ushort = 2;
    pub const RTA_IIF: ::c_ushort = 3;
    pub const RTA_OIF: ::c_ushort = 4;
    pub const RTA_GATEWAY: ::c_ushort = 5;
    pub const RTA_PRIORITY: ::c_ushort = 6;
    pub const RTA_PREFSRC: ::c_ushort = 7;
    pub const RTA_METRICS: ::c_ushort = 8;
    pub const RTA_MULTIPATH: ::c_ushort = 9;
    pub const RTA_PROTOINFO: ::c_ushort = 10; // No longer used
    pub const RTA_FLOW: ::c_ushort = 11;
    pub const RTA_CACHEINFO: ::c_ushort = 12;
    pub const RTA_SESSION: ::c_ushort = 13; // No longer used
    pub const RTA_MP_ALGO: ::c_ushort = 14; // No longer used
    pub const RTA_TABLE: ::c_ushort = 15;
    pub const RTA_MARK: ::c_ushort = 16;
    pub const RTA_MFC_STATS: ::c_ushort = 17;

    pub const RTN_UNSPEC: ::c_uchar = 0;
    pub const RTN_UNICAST: ::c_uchar = 1;
    pub const RTN_LOCAL: ::c_uchar = 2;
    pub const RTN_BROADCAST: ::c_uchar = 3;
    pub const RTN_ANYCAST: ::c_uchar = 4;
    pub const RTN_MULTICAST: ::c_uchar = 5;
    pub const RTN_BLACKHOLE: ::c_uchar = 6;
    pub const RTN_UNREACHABLE: ::c_uchar = 7;
    pub const RTN_PROHIBIT: ::c_uchar = 8;
    pub const RTN_THROW: ::c_uchar = 9;
    pub const RTN_NAT: ::c_uchar = 10;
    pub const RTN_XRESOLVE: ::c_uchar = 11;

    pub const RTPROT_UNSPEC: ::c_uchar = 0;
    pub const RTPROT_REDIRECT: ::c_uchar = 1;
    pub const RTPROT_KERNEL: ::c_uchar = 2;
    pub const RTPROT_BOOT: ::c_uchar = 3;
    pub const RTPROT_STATIC: ::c_uchar = 4;

    pub const RT_SCOPE_UNIVERSE: ::c_uchar = 0;
    pub const RT_SCOPE_SITE: ::c_uchar = 200;
    pub const RT_SCOPE_LINK: ::c_uchar = 253;
    pub const RT_SCOPE_HOST: ::c_uchar = 254;
    pub const RT_SCOPE_NOWHERE: ::c_uchar = 255;

    pub const RT_TABLE_UNSPEC: ::c_uchar = 0;
    pub const RT_TABLE_COMPAT: ::c_uchar = 252;
    pub const RT_TABLE_DEFAULT: ::c_uchar = 253;
    pub const RT_TABLE_MAIN: ::c_uchar = 254;
    pub const RT_TABLE_LOCAL: ::c_uchar = 255;

    pub const RTMSG_OVERRUN: u32 = ::NLMSG_OVERRUN as u32;
    pub const RTMSG_NEWDEVICE: u32 = 0x11;
    pub const RTMSG_DELDEVICE: u32 = 0x12;
    pub const RTMSG_NEWROUTE: u32 = 0x21;
    pub const RTMSG_DELROUTE: u32 = 0x22;
    pub const RTMSG_NEWRULE: u32 = 0x31;
    pub const RTMSG_DELRULE: u32 = 0x32;
    pub const RTMSG_CONTROL: u32 = 0x40;
    pub const RTMSG_AR_FAILED: u32 = 0x51;

    pub const MAX_ADDR_LEN: usize = 7;
    pub const ARPD_UPDATE: ::c_ushort = 0x01;
    pub const ARPD_LOOKUP: ::c_ushort = 0x02;
    pub const ARPD_FLUSH: ::c_ushort = 0x03;
    pub const ATF_MAGIC: ::c_int = 0x80;

    #[cfg(not(target_arch = "sparc64"))]
    pub const SO_TIMESTAMPING: ::c_int = 37;
    #[cfg(target_arch = "sparc64")]
    pub const SO_TIMESTAMPING: ::c_int = 35;
    pub const SCM_TIMESTAMPING: ::c_int = SO_TIMESTAMPING;

    // linux/module.h
    pub const MODULE_INIT_IGNORE_MODVERSIONS: ::c_uint = 0x0001;
    pub const MODULE_INIT_IGNORE_VERMAGIC: ::c_uint = 0x0002;

    // linux/net_tstamp.h
    pub const SOF_TIMESTAMPING_TX_HARDWARE: ::c_uint = 1 << 0;
    pub const SOF_TIMESTAMPING_TX_SOFTWARE: ::c_uint = 1 << 1;
    pub const SOF_TIMESTAMPING_RX_HARDWARE: ::c_uint = 1 << 2;
    pub const SOF_TIMESTAMPING_RX_SOFTWARE: ::c_uint = 1 << 3;
    pub const SOF_TIMESTAMPING_SOFTWARE: ::c_uint = 1 << 4;
    pub const SOF_TIMESTAMPING_SYS_HARDWARE: ::c_uint = 1 << 5;
    pub const SOF_TIMESTAMPING_RAW_HARDWARE: ::c_uint = 1 << 6;

    // linux/if_alg.h
    pub const ALG_SET_KEY: ::c_int = 1;
    pub const ALG_SET_IV: ::c_int = 2;
    pub const ALG_SET_OP: ::c_int = 3;
    pub const ALG_SET_AEAD_ASSOCLEN: ::c_int = 4;
    pub const ALG_SET_AEAD_AUTHSIZE: ::c_int = 5;

    pub const ALG_OP_DECRYPT: ::c_int = 0;
    pub const ALG_OP_ENCRYPT: ::c_int = 1;

    // uapi/linux/vm_sockets.h
    pub const VMADDR_CID_ANY: ::c_uint = 0xFFFFFFFF;
    pub const VMADDR_CID_HYPERVISOR: ::c_uint = 0;
    pub const VMADDR_CID_RESERVED: ::c_uint = 1;
    pub const VMADDR_CID_HOST: ::c_uint = 2;
    pub const VMADDR_PORT_ANY: ::c_uint = 0xFFFFFFFF;

    // uapi/linux/inotify.h
    pub const IN_ACCESS:        u32 = 0x0000_0001;
    pub const IN_MODIFY:        u32 = 0x0000_0002;
    pub const IN_ATTRIB:        u32 = 0x0000_0004;
    pub const IN_CLOSE_WRITE:   u32 = 0x0000_0008;
    pub const IN_CLOSE_NOWRITE: u32 = 0x0000_0010;
    pub const IN_CLOSE:         u32 = (IN_CLOSE_WRITE | IN_CLOSE_NOWRITE);
    pub const IN_OPEN:          u32 = 0x0000_0020;
    pub const IN_MOVED_FROM:    u32 = 0x0000_0040;
    pub const IN_MOVED_TO:      u32 = 0x0000_0080;
    pub const IN_MOVE:          u32 = (IN_MOVED_FROM | IN_MOVED_TO);
    pub const IN_CREATE:        u32 = 0x0000_0100;
    pub const IN_DELETE:        u32 = 0x0000_0200;
    pub const IN_DELETE_SELF:   u32 = 0x0000_0400;
    pub const IN_MOVE_SELF:     u32 = 0x0000_0800;
    pub const IN_UNMOUNT:       u32 = 0x0000_2000;
    pub const IN_Q_OVERFLOW:    u32 = 0x0000_4000;
    pub const IN_IGNORED:       u32 = 0x0000_8000;
    pub const IN_ONLYDIR:       u32 = 0x0100_0000;
    pub const IN_DONT_FOLLOW:   u32 = 0x0200_0000;
    // pub const IN_EXCL_UNLINK:   u32 = 0x0400_0000;

    // pub const IN_MASK_CREATE:   u32 = 0x1000_0000;
    // pub const IN_MASK_ADD:      u32 = 0x2000_0000;
    pub const IN_ISDIR:         u32 = 0x4000_0000;
    pub const IN_ONESHOT:       u32 = 0x8000_0000;

    pub const IN_ALL_EVENTS:    u32 = (
      IN_ACCESS | IN_MODIFY | IN_ATTRIB | IN_CLOSE_WRITE |
      IN_CLOSE_NOWRITE | IN_OPEN | IN_MOVED_FROM |
      IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF |
      IN_MOVE_SELF
    );

    pub const IN_CLOEXEC: ::c_int = O_CLOEXEC;
    pub const IN_NONBLOCK: ::c_int = O_NONBLOCK;

    pub const FUTEX_WAIT: ::c_int = 0;
    pub const FUTEX_WAKE: ::c_int = 1;
    pub const FUTEX_FD: ::c_int = 2;
    pub const FUTEX_REQUEUE: ::c_int = 3;
    pub const FUTEX_CMP_REQUEUE: ::c_int = 4;
    pub const FUTEX_WAKE_OP: ::c_int = 5;
    pub const FUTEX_LOCK_PI: ::c_int = 6;
    pub const FUTEX_UNLOCK_PI: ::c_int = 7;
    pub const FUTEX_TRYLOCK_PI: ::c_int = 8;
    pub const FUTEX_WAIT_BITSET: ::c_int = 9;
    pub const FUTEX_WAKE_BITSET: ::c_int = 10;
    pub const FUTEX_WAIT_REQUEUE_PI: ::c_int = 11;
    pub const FUTEX_CMP_REQUEUE_PI: ::c_int = 12;

    pub const FUTEX_PRIVATE_FLAG: ::c_int = 128;
    pub const FUTEX_CLOCK_REALTIME: ::c_int = 256;
    pub const FUTEX_CMD_MASK: ::c_int =
        !(FUTEX_PRIVATE_FLAG | FUTEX_CLOCK_REALTIME);

    f! {
        pub fn CMSG_NXTHDR(mhdr: *const msghdr,
                           cmsg: *const cmsghdr) -> *mut cmsghdr {
            if ((*cmsg).cmsg_len as usize) < ::mem::size_of::<cmsghdr>() {
                return 0 as *mut cmsghdr;
            };
            let next = (cmsg as usize +
                        super::CMSG_ALIGN((*cmsg).cmsg_len as usize))
                as *mut cmsghdr;
            let max = (*mhdr).msg_control as usize
                + (*mhdr).msg_controllen as usize;
            if (next.offset(1)) as usize > max ||
                next as usize + super::CMSG_ALIGN((*next).cmsg_len as usize) > max
            {
                0 as *mut cmsghdr
            } else {
                next as *mut cmsghdr
            }
        }

        pub fn CPU_ZERO(cpuset: &mut cpu_set_t) -> () {
            for slot in cpuset.bits.iter_mut() {
                *slot = 0;
            }
        }

        pub fn CPU_SET(cpu: usize, cpuset: &mut cpu_set_t) -> () {
            let size_in_bits
                = 8 * ::mem::size_of_val(&cpuset.bits[0]); // 32, 64 etc
            let (idx, offset) = (cpu / size_in_bits, cpu % size_in_bits);
            cpuset.bits[idx] |= 1 << offset;
            ()
        }

        pub fn CPU_CLR(cpu: usize, cpuset: &mut cpu_set_t) -> () {
            let size_in_bits
                = 8 * ::mem::size_of_val(&cpuset.bits[0]); // 32, 64 etc
            let (idx, offset) = (cpu / size_in_bits, cpu % size_in_bits);
            cpuset.bits[idx] &= !(1 << offset);
            ()
        }

        pub fn CPU_ISSET(cpu: usize, cpuset: &cpu_set_t) -> bool {
            let size_in_bits = 8 * ::mem::size_of_val(&cpuset.bits[0]);
            let (idx, offset) = (cpu / size_in_bits, cpu % size_in_bits);
            0 != (cpuset.bits[idx] & (1 << offset))
        }

        pub fn CPU_EQUAL(set1: &cpu_set_t, set2: &cpu_set_t) -> bool {
            set1.bits == set2.bits
        }

        pub fn major(dev: ::dev_t) -> ::c_uint {
            let mut major = 0;
            major |= (dev & 0x00000000000fff00) >> 8;
            major |= (dev & 0xfffff00000000000) >> 32;
            major as ::c_uint
        }

        pub fn minor(dev: ::dev_t) -> ::c_uint {
            let mut minor = 0;
            minor |= (dev & 0x00000000000000ff) >> 0;
            minor |= (dev & 0x00000ffffff00000) >> 12;
            minor as ::c_uint
        }

        pub fn makedev(major: ::c_uint, minor: ::c_uint) -> ::dev_t {
            let major = major as ::dev_t;
            let minor = minor as ::dev_t;
            let mut dev = 0;
            dev |= (major & 0x00000fff) << 8;
            dev |= (major & 0xfffff000) << 32;
            dev |= (minor & 0x000000ff) << 0;
            dev |= (minor & 0xffffff00) << 12;
            dev
        }

        pub fn IPTOS_TOS(tos: u8) -> u8 {
            tos & IPTOS_TOS_MASK
        }

        pub fn IPTOS_PREC(tos: u8) -> u8 {
            tos & IPTOS_PREC_MASK
        }

        pub fn RT_TOS(tos: u8) -> u8 {
            tos & ::IPTOS_TOS_MASK
        }

        pub fn RT_ADDRCLASS(flags: u32) -> u32 {
            flags >> 23
        }

        pub fn RT_LOCALADDR(flags: u32) -> bool {
            (flags & RTF_ADDRCLASSMASK) == (RTF_LOCAL | RTF_INTERFACE)
        }
    }

    extern {
        #[cfg_attr(not(target_env = "musl"),
                   link_name = "__xpg_strerror_r")]
        pub fn strerror_r(errnum: ::c_int, buf: *mut c_char,
                          buflen: ::size_t) -> ::c_int;

        pub fn abs(i: ::c_int) -> ::c_int;
        pub fn atof(s: *const ::c_char) -> ::c_double;
        pub fn labs(i: ::c_long) -> ::c_long;
        pub fn rand() -> ::c_int;
        pub fn srand(seed: ::c_uint);

        pub fn aio_read(aiocbp: *mut aiocb) -> ::c_int;
        pub fn aio_write(aiocbp: *mut aiocb) -> ::c_int;
        pub fn aio_fsync(op: ::c_int, aiocbp: *mut aiocb) -> ::c_int;
        pub fn aio_error(aiocbp: *const aiocb) -> ::c_int;
        pub fn aio_return(aiocbp: *mut aiocb) -> ::ssize_t;
        pub fn aio_suspend(aiocb_list: *const *const aiocb, nitems: ::c_int,
                           timeout: *const ::timespec) -> ::c_int;
        pub fn aio_cancel(fd: ::c_int, aiocbp: *mut aiocb) -> ::c_int;
        pub fn lio_listio(mode: ::c_int, aiocb_list: *const *mut aiocb,
                          nitems: ::c_int, sevp: *mut ::sigevent) -> ::c_int;

        pub fn lutimes(file: *const ::c_char, times: *const ::timeval) -> ::c_int;

        pub fn setpwent();
        pub fn endpwent();
        pub fn getpwent() -> *mut passwd;
        pub fn setgrent();
        pub fn endgrent();
        pub fn getgrent() -> *mut ::group;
        pub fn setspent();
        pub fn endspent();
        pub fn getspent() -> *mut spwd;

        pub fn getspnam(__name: *const ::c_char) -> *mut spwd;

        pub fn shm_open(name: *const c_char, oflag: ::c_int,
                        mode: mode_t) -> ::c_int;

        // System V IPC
        pub fn shmget(key: ::key_t, size: ::size_t, shmflg: ::c_int) -> ::c_int;
        pub fn shmat(shmid: ::c_int,
                     shmaddr: *const ::c_void,
                     shmflg: ::c_int) -> *mut ::c_void;
        pub fn shmdt(shmaddr: *const ::c_void) -> ::c_int;
        pub fn shmctl(shmid: ::c_int,
                      cmd: ::c_int,
                      buf: *mut ::shmid_ds) -> ::c_int;
        pub fn ftok(pathname: *const ::c_char, proj_id: ::c_int) -> ::key_t;
        pub fn semget(key: ::key_t, nsems: ::c_int, semflag: ::c_int) -> ::c_int;
        pub fn semop(semid: ::c_int,
                     sops: *mut ::sembuf, nsops: ::size_t) -> ::c_int;
        pub fn semctl(semid: ::c_int,
                      semnum: ::c_int, cmd: ::c_int, ...) -> ::c_int;
        pub fn msgctl(msqid: ::c_int, cmd: ::c_int, buf: *mut msqid_ds) -> ::c_int;
        pub fn msgget(key: ::key_t, msgflg: ::c_int) -> ::c_int;
        pub fn msgrcv(msqid: ::c_int, msgp: *mut ::c_void, msgsz: ::size_t,
                      msgtyp: ::c_long, msgflg: ::c_int) -> ::ssize_t;
        pub fn msgsnd(msqid: ::c_int, msgp: *const ::c_void, msgsz: ::size_t,
                      msgflg: ::c_int) -> ::c_int;

        pub fn mprotect(addr: *mut ::c_void, len: ::size_t, prot: ::c_int)
                        -> ::c_int;
        pub fn __errno_location() -> *mut ::c_int;

        pub fn fopen64(filename: *const c_char,
                       mode: *const c_char) -> *mut ::FILE;
        pub fn freopen64(filename: *const c_char, mode: *const c_char,
                         file: *mut ::FILE) -> *mut ::FILE;
        pub fn tmpfile64() -> *mut ::FILE;
        pub fn fgetpos64(stream: *mut ::FILE, ptr: *mut fpos64_t) -> ::c_int;
        pub fn fsetpos64(stream: *mut ::FILE, ptr: *const fpos64_t) -> ::c_int;
        pub fn fseeko64(stream: *mut ::FILE,
                        offset: ::off64_t,
                        whence: ::c_int) -> ::c_int;
        pub fn ftello64(stream: *mut ::FILE) -> ::off64_t;
        pub fn fallocate(fd: ::c_int, mode: ::c_int,
                         offset: ::off_t, len: ::off_t) -> ::c_int;
        pub fn fallocate64(fd: ::c_int, mode: ::c_int,
                           offset: ::off64_t, len: ::off64_t) -> ::c_int;
        pub fn posix_fallocate(fd: ::c_int, offset: ::off_t,
                               len: ::off_t) -> ::c_int;
        pub fn posix_fallocate64(fd: ::c_int, offset: ::off64_t,
                                 len: ::off64_t) -> ::c_int;
        pub fn readahead(fd: ::c_int, offset: ::off64_t,
                         count: ::size_t) -> ::ssize_t;
        pub fn getxattr(path: *const c_char, name: *const c_char,
                        value: *mut ::c_void, size: ::size_t) -> ::ssize_t;
        pub fn lgetxattr(path: *const c_char, name: *const c_char,
                         value: *mut ::c_void, size: ::size_t) -> ::ssize_t;
        pub fn fgetxattr(filedes: ::c_int, name: *const c_char,
                         value: *mut ::c_void, size: ::size_t) -> ::ssize_t;
        pub fn setxattr(path: *const c_char, name: *const c_char,
                        value: *const ::c_void, size: ::size_t,
                        flags: ::c_int) -> ::c_int;
        pub fn lsetxattr(path: *const c_char, name: *const c_char,
                         value: *const ::c_void, size: ::size_t,
                         flags: ::c_int) -> ::c_int;
        pub fn fsetxattr(filedes: ::c_int, name: *const c_char,
                         value: *const ::c_void, size: ::size_t,
                         flags: ::c_int) -> ::c_int;
        pub fn listxattr(path: *const c_char, list: *mut c_char,
                         size: ::size_t) -> ::ssize_t;
        pub fn llistxattr(path: *const c_char, list: *mut c_char,
                          size: ::size_t) -> ::ssize_t;
        pub fn flistxattr(filedes: ::c_int, list: *mut c_char,
                          size: ::size_t) -> ::ssize_t;
        pub fn removexattr(path: *const c_char, name: *const c_char) -> ::c_int;
        pub fn lremovexattr(path: *const c_char, name: *const c_char) -> ::c_int;
        pub fn fremovexattr(filedes: ::c_int, name: *const c_char) -> ::c_int;
        pub fn signalfd(fd: ::c_int,
                        mask: *const ::sigset_t,
                        flags: ::c_int) -> ::c_int;
        pub fn timerfd_create(clockid: ::c_int, flags: ::c_int) -> ::c_int;
        pub fn timerfd_gettime(fd: ::c_int,
                               curr_value: *mut itimerspec) -> ::c_int;
        pub fn timerfd_settime(fd: ::c_int,
                               flags: ::c_int,
                               new_value: *const itimerspec,
                               old_value: *mut itimerspec) -> ::c_int;
        pub fn pwritev(fd: ::c_int,
                       iov: *const ::iovec,
                       iovcnt: ::c_int,
                       offset: ::off_t) -> ::ssize_t;
        pub fn preadv(fd: ::c_int,
                      iov: *const ::iovec,
                      iovcnt: ::c_int,
                      offset: ::off_t) -> ::ssize_t;
        pub fn quotactl(cmd: ::c_int,
                        special: *const ::c_char,
                        id: ::c_int,
                        data: *mut ::c_char) -> ::c_int;
        pub fn mq_open(name: *const ::c_char, oflag: ::c_int, ...) -> ::mqd_t;
        pub fn mq_close(mqd: ::mqd_t) -> ::c_int;
        pub fn mq_unlink(name: *const ::c_char) -> ::c_int;
        pub fn mq_receive(mqd: ::mqd_t,
                          msg_ptr: *mut ::c_char,
                          msg_len: ::size_t,
                          msq_prio: *mut ::c_uint) -> ::ssize_t;
        pub fn mq_timedreceive(mqd: ::mqd_t,
                               msg_ptr: *mut ::c_char,
                               msg_len: ::size_t,
                               msq_prio: *mut ::c_uint,
                               abs_timeout: *const ::timespec) -> ::ssize_t;
        pub fn mq_send(mqd: ::mqd_t,
                       msg_ptr: *const ::c_char,
                       msg_len: ::size_t,
                       msq_prio: ::c_uint) -> ::c_int;
        pub fn mq_timedsend(mqd: ::mqd_t,
                            msg_ptr: *const ::c_char,
                            msg_len: ::size_t,
                            msq_prio: ::c_uint,
                            abs_timeout: *const ::timespec) -> ::c_int;
        pub fn mq_getattr(mqd: ::mqd_t, attr: *mut ::mq_attr) -> ::c_int;
        pub fn mq_setattr(mqd: ::mqd_t,
                          newattr: *const ::mq_attr,
                          oldattr: *mut ::mq_attr) -> ::c_int;
        pub fn epoll_pwait(epfd: ::c_int,
                           events: *mut ::epoll_event,
                           maxevents: ::c_int,
                           timeout: ::c_int,
                           sigmask: *const ::sigset_t) -> ::c_int;
        pub fn dup3(oldfd: ::c_int, newfd: ::c_int, flags: ::c_int) -> ::c_int;
        pub fn mkostemp(template: *mut ::c_char, flags: ::c_int) -> ::c_int;
        pub fn mkostemps(template: *mut ::c_char,
                         suffixlen: ::c_int,
                         flags: ::c_int) -> ::c_int;
        pub fn sigtimedwait(set: *const sigset_t,
                            info: *mut siginfo_t,
                            timeout: *const ::timespec) -> ::c_int;
        pub fn sigwaitinfo(set: *const sigset_t,
                           info: *mut siginfo_t) -> ::c_int;
        pub fn nl_langinfo_l(item: ::nl_item, locale: ::locale_t) -> *mut ::c_char;
        pub fn getnameinfo(sa: *const ::sockaddr,
                           salen: ::socklen_t,
                           host: *mut ::c_char,
                           hostlen: ::socklen_t,
                           serv: *mut ::c_char,
                           sevlen: ::socklen_t,
                           flags: ::c_int) -> ::c_int;
        pub fn pthread_setschedprio(native: ::pthread_t,
                                    priority: ::c_int) -> ::c_int;
        pub fn getloadavg(loadavg: *mut ::c_double, nelem: ::c_int) -> ::c_int;
        pub fn process_vm_readv(pid: ::pid_t,
                                local_iov: *const ::iovec,
                                liovcnt: ::c_ulong,
                                remote_iov: *const ::iovec,
                                riovcnt: ::c_ulong,
                                flags: ::c_ulong) -> isize;
        pub fn process_vm_writev(pid: ::pid_t,
                                 local_iov: *const ::iovec,
                                 liovcnt: ::c_ulong,
                                 remote_iov: *const ::iovec,
                                 riovcnt: ::c_ulong,
                                 flags: ::c_ulong) -> isize;
        pub fn reboot(how_to: ::c_int) -> ::c_int;
        pub fn setfsgid(gid: ::gid_t) -> ::c_int;
        pub fn setfsuid(uid: ::uid_t) -> ::c_int;

        // Not available now on Android
        pub fn mkfifoat(dirfd: ::c_int, pathname: *const ::c_char,
                        mode: ::mode_t) -> ::c_int;
        pub fn if_nameindex() -> *mut if_nameindex;
        pub fn if_freenameindex(ptr: *mut if_nameindex);
        pub fn sync_file_range(fd: ::c_int, offset: ::off64_t,
                               nbytes: ::off64_t, flags: ::c_uint) -> ::c_int;
        pub fn mremap(addr: *mut ::c_void,
                      len: ::size_t,
                      new_len: ::size_t,
                      flags: ::c_int,
                      ...) -> *mut ::c_void;

        pub fn glob(pattern: *const c_char,
                    flags: ::c_int,
                    errfunc: ::Option<extern fn(epath: *const c_char,
                                              errno: ::c_int) -> ::c_int>,
                    pglob: *mut ::glob_t) -> ::c_int;
        pub fn globfree(pglob: *mut ::glob_t);

        pub fn posix_madvise(addr: *mut ::c_void, len: ::size_t, advice: ::c_int)
                             -> ::c_int;

        pub fn shm_unlink(name: *const ::c_char) -> ::c_int;

        pub fn seekdir(dirp: *mut ::DIR, loc: ::c_long);

        pub fn telldir(dirp: *mut ::DIR) -> ::c_long;
        pub fn madvise(addr: *mut ::c_void, len: ::size_t, advice: ::c_int)
                      -> ::c_int;

        pub fn msync(addr: *mut ::c_void, len: ::size_t, flags: ::c_int) -> ::c_int;
        pub fn remap_file_pages(addr: *mut ::c_void, size: ::size_t, prot: ::c_int,
                                pgoff: ::size_t, flags: ::c_int) -> ::c_int;
        pub fn recvfrom(socket: ::c_int, buf: *mut ::c_void, len: ::size_t,
                        flags: ::c_int, addr: *mut ::sockaddr,
                        addrlen: *mut ::socklen_t) -> ::ssize_t;
        pub fn mkstemps(template: *mut ::c_char, suffixlen: ::c_int) -> ::c_int;
        pub fn futimes(fd: ::c_int, times: *const ::timeval) -> ::c_int;
        pub fn nl_langinfo(item: ::nl_item) -> *mut ::c_char;

        pub fn getdomainname(name: *mut ::c_char, len: ::size_t) -> ::c_int;
        pub fn setdomainname(name: *const ::c_char, len: ::size_t) -> ::c_int;
        pub fn vhangup() -> ::c_int;
        pub fn sync();
        pub fn syscall(num: ::c_long, ...) -> ::c_long;
        pub fn sched_getaffinity(pid: ::pid_t,
                                 cpusetsize: ::size_t,
                                 cpuset: *mut cpu_set_t) -> ::c_int;
        pub fn sched_setaffinity(pid: ::pid_t,
                                 cpusetsize: ::size_t,
                                 cpuset: *const cpu_set_t) -> ::c_int;
        pub fn epoll_create(size: ::c_int) -> ::c_int;
        pub fn epoll_create1(flags: ::c_int) -> ::c_int;
        pub fn epoll_wait(epfd: ::c_int,
                          events: *mut ::epoll_event,
                          maxevents: ::c_int,
                          timeout: ::c_int) -> ::c_int;
        pub fn epoll_ctl(epfd: ::c_int,
                         op: ::c_int,
                         fd: ::c_int,
                         event: *mut ::epoll_event) -> ::c_int;
        pub fn pthread_getschedparam(native: ::pthread_t,
                                     policy: *mut ::c_int,
                                     param: *mut ::sched_param) -> ::c_int;
        pub fn unshare(flags: ::c_int) -> ::c_int;
        pub fn umount(target: *const ::c_char) -> ::c_int;
        pub fn sched_get_priority_max(policy: ::c_int) -> ::c_int;
        pub fn tee(fd_in: ::c_int,
                   fd_out: ::c_int,
                   len: ::size_t,
                   flags: ::c_uint) -> ::ssize_t;
        pub fn settimeofday(tv: *const ::timeval, tz: *const ::timezone) -> ::c_int;
        pub fn splice(fd_in: ::c_int,
                      off_in: *mut ::loff_t,
                      fd_out: ::c_int,
                      off_out: *mut ::loff_t,
                      len: ::size_t,
                      flags: ::c_uint) -> ::ssize_t;
        pub fn eventfd(init: ::c_uint, flags: ::c_int) -> ::c_int;
        pub fn sched_rr_get_interval(pid: ::pid_t, tp: *mut ::timespec) -> ::c_int;
        pub fn sem_timedwait(sem: *mut sem_t,
                             abstime: *const ::timespec) -> ::c_int;
        pub fn sem_getvalue(sem: *mut sem_t,
                            sval: *mut ::c_int) -> ::c_int;
        pub fn sched_setparam(pid: ::pid_t, param: *const ::sched_param) -> ::c_int;
        pub fn setns(fd: ::c_int, nstype: ::c_int) -> ::c_int;
        pub fn swapoff(puath: *const ::c_char) -> ::c_int;
        pub fn vmsplice(fd: ::c_int,
                        iov: *const ::iovec,
                        nr_segs: ::size_t,
                        flags: ::c_uint) -> ::ssize_t;
        pub fn mount(src: *const ::c_char,
                     target: *const ::c_char,
                     fstype: *const ::c_char,
                     flags: ::c_ulong,
                     data: *const ::c_void) -> ::c_int;
        pub fn personality(persona: ::c_ulong) -> ::c_int;
        pub fn prctl(option: ::c_int, ...) -> ::c_int;
        pub fn sched_getparam(pid: ::pid_t, param: *mut ::sched_param) -> ::c_int;
        pub fn ppoll(fds: *mut ::pollfd,
                     nfds: nfds_t,
                     timeout: *const ::timespec,
                     sigmask: *const sigset_t) -> ::c_int;
        pub fn pthread_mutex_timedlock(lock: *mut pthread_mutex_t,
                                       abstime: *const ::timespec) -> ::c_int;
        pub fn clone(cb: extern fn(*mut ::c_void) -> ::c_int,
                     child_stack: *mut ::c_void,
                     flags: ::c_int,
                     arg: *mut ::c_void, ...) -> ::c_int;
        pub fn sched_getscheduler(pid: ::pid_t) -> ::c_int;
        pub fn clock_nanosleep(clk_id: ::clockid_t,
                               flags: ::c_int,
                               rqtp: *const ::timespec,
                               rmtp:  *mut ::timespec) -> ::c_int;
        pub fn pthread_attr_getguardsize(attr: *const ::pthread_attr_t,
                                         guardsize: *mut ::size_t) -> ::c_int;
        pub fn sethostname(name: *const ::c_char, len: ::size_t) -> ::c_int;
        pub fn sched_get_priority_min(policy: ::c_int) -> ::c_int;
        pub fn pthread_condattr_getpshared(attr: *const pthread_condattr_t,
                                           pshared: *mut ::c_int) -> ::c_int;
        pub fn sysinfo(info: *mut ::sysinfo) -> ::c_int;
        pub fn umount2(target: *const ::c_char, flags: ::c_int) -> ::c_int;
        pub fn pthread_setschedparam(native: ::pthread_t,
                                     policy: ::c_int,
                                     param: *const ::sched_param) -> ::c_int;
        pub fn swapon(path: *const ::c_char, swapflags: ::c_int) -> ::c_int;
        pub fn sched_setscheduler(pid: ::pid_t,
                                  policy: ::c_int,
                                  param: *const ::sched_param) -> ::c_int;
        pub fn sendfile(out_fd: ::c_int,
                        in_fd: ::c_int,
                        offset: *mut off_t,
                        count: ::size_t) -> ::ssize_t;
        pub fn sigsuspend(mask: *const ::sigset_t) -> ::c_int;
        #[cfg_attr(target_os = "solaris", link_name = "__posix_getgrgid_r")]
        pub fn getgrgid_r(gid: ::gid_t,
                          grp: *mut ::group,
                          buf: *mut ::c_char,
                          buflen: ::size_t,
                          result: *mut *mut ::group) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "sigaltstack$UNIX2003")]
        #[cfg_attr(target_os = "netbsd", link_name = "__sigaltstack14")]
        pub fn sigaltstack(ss: *const stack_t,
                           oss: *mut stack_t) -> ::c_int;
        pub fn sem_close(sem: *mut sem_t) -> ::c_int;
        pub fn getdtablesize() -> ::c_int;
        #[cfg_attr(target_os = "solaris", link_name = "__posix_getgrnam_r")]
        pub fn getgrnam_r(name: *const ::c_char,
                          grp: *mut ::group,
                          buf: *mut ::c_char,
                          buflen: ::size_t,
                          result: *mut *mut ::group) -> ::c_int;
        pub fn initgroups(user: *const ::c_char, group: ::gid_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "pthread_sigmask$UNIX2003")]
        pub fn pthread_sigmask(how: ::c_int, set: *const sigset_t,
                               oldset: *mut sigset_t) -> ::c_int;
        pub fn sem_open(name: *const ::c_char, oflag: ::c_int, ...) -> *mut sem_t;
        pub fn getgrnam(name: *const ::c_char) -> *mut ::group;
        pub fn pthread_cancel(thread: ::pthread_t) -> ::c_int;
        pub fn pthread_kill(thread: ::pthread_t, sig: ::c_int) -> ::c_int;
        pub fn sem_unlink(name: *const ::c_char) -> ::c_int;
        pub fn daemon(nochdir: ::c_int, noclose: ::c_int) -> ::c_int;
        #[cfg_attr(target_os = "netbsd", link_name = "__getpwnam_r50")]
        #[cfg_attr(target_os = "solaris", link_name = "__posix_getpwnam_r")]
        pub fn getpwnam_r(name: *const ::c_char,
                          pwd: *mut passwd,
                          buf: *mut ::c_char,
                          buflen: ::size_t,
                          result: *mut *mut passwd) -> ::c_int;
        #[cfg_attr(target_os = "netbsd", link_name = "__getpwuid_r50")]
        #[cfg_attr(target_os = "solaris", link_name = "__posix_getpwuid_r")]
        pub fn getpwuid_r(uid: ::uid_t,
                          pwd: *mut passwd,
                          buf: *mut ::c_char,
                          buflen: ::size_t,
                          result: *mut *mut passwd) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch ="x86"),
                   link_name = "sigwait$UNIX2003")]
        #[cfg_attr(target_os = "solaris", link_name = "__posix_sigwait")]
        pub fn sigwait(set: *const sigset_t,
                       sig: *mut ::c_int) -> ::c_int;
        pub fn pthread_atfork(prepare: ::Option<unsafe extern fn()>,
                              parent: ::Option<unsafe extern fn()>,
                              child: ::Option<unsafe extern fn()>) -> ::c_int;
        pub fn getgrgid(gid: ::gid_t) -> *mut ::group;
        pub fn getgrouplist(user: *const ::c_char,
                            group: ::gid_t,
                            groups: *mut ::gid_t,
                            ngroups: *mut ::c_int) -> ::c_int;
        pub fn pthread_mutexattr_getpshared(attr: *const pthread_mutexattr_t,
                                            pshared: *mut ::c_int) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "popen$UNIX2003")]
        pub fn popen(command: *const c_char,
                     mode: *const c_char) -> *mut ::FILE;
        pub fn faccessat(dirfd: ::c_int, pathname: *const ::c_char,
                         mode: ::c_int, flags: ::c_int) -> ::c_int;
        pub fn pthread_create(native: *mut ::pthread_t,
                              attr: *const ::pthread_attr_t,
                              f: extern fn(*mut ::c_void) -> *mut ::c_void,
                              value: *mut ::c_void) -> ::c_int;
        pub fn dl_iterate_phdr(
            callback: ::Option<unsafe extern fn(
                info: *mut ::dl_phdr_info,
                size: ::size_t,
                data: *mut ::c_void
            ) -> ::c_int>,
            data: *mut ::c_void
        ) -> ::c_int;

        pub fn setmntent(filename: *const ::c_char,
                         ty: *const ::c_char) -> *mut ::FILE;
        pub fn getmntent(stream: *mut ::FILE) -> *mut ::mntent;
        pub fn addmntent(stream: *mut ::FILE, mnt: *const ::mntent) -> ::c_int;
        pub fn endmntent(streamp: *mut ::FILE) -> ::c_int;
        pub fn hasmntopt(mnt: *const ::mntent,
                         opt: *const ::c_char) -> *mut ::c_char;

        pub fn posix_spawn(pid: *mut ::pid_t,
                           path: *const ::c_char,
                           file_actions: *const ::posix_spawn_file_actions_t,
                           attrp: *const ::posix_spawnattr_t,
                           argv: *const *mut ::c_char,
                           envp: *const *mut ::c_char) -> ::c_int;
        pub fn posix_spawnp(pid: *mut ::pid_t,
                           file: *const ::c_char,
                            file_actions: *const ::posix_spawn_file_actions_t,
                            attrp: *const ::posix_spawnattr_t,
                            argv: *const *mut ::c_char,
                            envp: *const *mut ::c_char) -> ::c_int;
        pub fn posix_spawnattr_init(attr: *mut posix_spawnattr_t) -> ::c_int;
        pub fn posix_spawnattr_destroy(attr: *mut posix_spawnattr_t) -> ::c_int;
        pub fn posix_spawnattr_getsigdefault(attr: *const posix_spawnattr_t,
                                             default: *mut ::sigset_t) -> ::c_int;
        pub fn posix_spawnattr_setsigdefault(attr: *mut posix_spawnattr_t,
                                             default: *const ::sigset_t) -> ::c_int;
        pub fn posix_spawnattr_getsigmask(attr: *const posix_spawnattr_t,
                                          default: *mut ::sigset_t) -> ::c_int;
        pub fn posix_spawnattr_setsigmask(attr: *mut posix_spawnattr_t,
                                          default: *const ::sigset_t) -> ::c_int;
        pub fn posix_spawnattr_getflags(attr: *const posix_spawnattr_t,
                                        flags: *mut ::c_short) -> ::c_int;
        pub fn posix_spawnattr_setflags(attr: *mut posix_spawnattr_t,
                                        flags: ::c_short) -> ::c_int;
        pub fn posix_spawnattr_getpgroup(attr: *const posix_spawnattr_t,
                                         flags: *mut ::pid_t) -> ::c_int;
        pub fn posix_spawnattr_setpgroup(attr: *mut posix_spawnattr_t,
                                         flags: ::pid_t) -> ::c_int;
        pub fn posix_spawnattr_getschedpolicy(attr: *const posix_spawnattr_t,
                                              flags: *mut ::c_int) -> ::c_int;
        pub fn posix_spawnattr_setschedpolicy(attr: *mut posix_spawnattr_t,
                                              flags: ::c_int) -> ::c_int;
        pub fn posix_spawnattr_getschedparam(
            attr: *const posix_spawnattr_t,
            param: *mut ::sched_param,
        ) -> ::c_int;
        pub fn posix_spawnattr_setschedparam(
            attr: *mut posix_spawnattr_t,
            param: *const ::sched_param,
        ) -> ::c_int;

        pub fn posix_spawn_file_actions_init(
            actions: *mut posix_spawn_file_actions_t,
        ) -> ::c_int;
        pub fn posix_spawn_file_actions_destroy(
            actions: *mut posix_spawn_file_actions_t,
        ) -> ::c_int;
        pub fn posix_spawn_file_actions_addopen(
            actions: *mut posix_spawn_file_actions_t,
            fd: ::c_int,
            path: *const ::c_char,
            oflag: ::c_int,
            mode: ::mode_t,
        ) -> ::c_int;
        pub fn posix_spawn_file_actions_addclose(
            actions: *mut posix_spawn_file_actions_t,
            fd: ::c_int,
        ) -> ::c_int;
        pub fn posix_spawn_file_actions_adddup2(
            actions: *mut posix_spawn_file_actions_t,
            fd: ::c_int,
            newfd: ::c_int,
        ) -> ::c_int;
        pub fn fread_unlocked(ptr: *mut ::c_void,
            size: ::size_t,
            nobj: ::size_t,
            stream: *mut ::FILE
        ) -> ::size_t;
        pub fn inotify_rm_watch(fd: ::c_int, wd: ::c_int) -> ::c_int;
        pub fn inotify_init() -> ::c_int;
        pub fn inotify_init1(flags: ::c_int) -> ::c_int;
        pub fn inotify_add_watch(fd: ::c_int,
                                 path: *const ::c_char,
                                 mask: u32) -> ::c_int;
    }

    cfg_if! {
        if #[cfg(target_env = "musl")] {
            mod musl;
            pub use self::musl::*;
        } else if #[cfg(target_env = "gnu")] {
            mod gnu;
            pub use self::gnu::*;
        }
    }

    cfg_if! {
        if #[cfg(libc_align)] {
            #[macro_use]
            mod align;
        } else {
            #[macro_use]
            mod no_align;
        }
    }
    expand_align!();

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