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    pub type sa_family_t = u16;
    pub type speed_t = ::c_uint;
    pub type tcflag_t = ::c_uint;
    pub type clockid_t = ::c_int;
    pub type key_t = ::c_int;
    pub type id_t = ::c_uint;

    #[cfg_attr(feature = "extra_traits", derive(Debug))]
    pub enum timezone {}
    impl ::Copy for timezone {}
    impl ::Clone for timezone {
        fn clone(&self) -> timezone { *self }
    }

    s! {
        pub struct in_addr {
            pub s_addr: ::in_addr_t,
        }

        pub struct ip_mreq {
            pub imr_multiaddr: in_addr,
            pub imr_interface: in_addr,
        }

        pub struct sockaddr {
            pub sa_family: sa_family_t,
            pub sa_data: [::c_char; 14],
        }

        pub struct sockaddr_in {
            pub sin_family: sa_family_t,
            pub sin_port: ::in_port_t,
            pub sin_addr: ::in_addr,
            pub sin_zero: [u8; 8],
        }

        pub struct sockaddr_in6 {
            pub sin6_family: sa_family_t,
            pub sin6_port: ::in_port_t,
            pub sin6_flowinfo: u32,
            pub sin6_addr: ::in6_addr,
            pub sin6_scope_id: u32,
        }

        pub struct addrinfo {
            pub ai_flags: ::c_int,
            pub ai_family: ::c_int,
            pub ai_socktype: ::c_int,
            pub ai_protocol: ::c_int,
            pub ai_addrlen: socklen_t,

            #[cfg(any(target_os = "linux",
                      target_os = "emscripten"))]
            pub ai_addr: *mut ::sockaddr,

            pub ai_canonname: *mut c_char,

            #[cfg(target_os = "android")]
            pub ai_addr: *mut ::sockaddr,

            pub ai_next: *mut addrinfo,
        }

        pub struct sockaddr_ll {
            pub sll_family: ::c_ushort,
            pub sll_protocol: ::c_ushort,
            pub sll_ifindex: ::c_int,
            pub sll_hatype: ::c_ushort,
            pub sll_pkttype: ::c_uchar,
            pub sll_halen: ::c_uchar,
            pub sll_addr: [::c_uchar; 8]
        }

        pub struct fd_set {
            fds_bits: [::c_ulong; FD_SETSIZE / ULONG_SIZE],
        }

        pub struct tm {
            pub tm_sec: ::c_int,
            pub tm_min: ::c_int,
            pub tm_hour: ::c_int,
            pub tm_mday: ::c_int,
            pub tm_mon: ::c_int,
            pub tm_year: ::c_int,
            pub tm_wday: ::c_int,
            pub tm_yday: ::c_int,
            pub tm_isdst: ::c_int,
            pub tm_gmtoff: ::c_long,
            pub tm_zone: *const ::c_char,
        }

        pub struct sched_param {
            pub sched_priority: ::c_int,
            #[cfg(any(target_env = "musl", target_os = "emscripten"))]
            pub sched_ss_low_priority: ::c_int,
            #[cfg(any(target_env = "musl", target_os = "emscripten"))]
            pub sched_ss_repl_period: ::timespec,
            #[cfg(any(target_env = "musl", target_os = "emscripten"))]
            pub sched_ss_init_budget: ::timespec,
            #[cfg(any(target_env = "musl", target_os = "emscripten"))]
            pub sched_ss_max_repl: ::c_int,
        }

        pub struct Dl_info {
            pub dli_fname: *const ::c_char,
            pub dli_fbase: *mut ::c_void,
            pub dli_sname: *const ::c_char,
            pub dli_saddr: *mut ::c_void,
        }

        pub struct lconv {
            pub decimal_point: *mut ::c_char,
            pub thousands_sep: *mut ::c_char,
            pub grouping: *mut ::c_char,
            pub int_curr_symbol: *mut ::c_char,
            pub currency_symbol: *mut ::c_char,
            pub mon_decimal_point: *mut ::c_char,
            pub mon_thousands_sep: *mut ::c_char,
            pub mon_grouping: *mut ::c_char,
            pub positive_sign: *mut ::c_char,
            pub negative_sign: *mut ::c_char,
            pub int_frac_digits: ::c_char,
            pub frac_digits: ::c_char,
            pub p_cs_precedes: ::c_char,
            pub p_sep_by_space: ::c_char,
            pub n_cs_precedes: ::c_char,
            pub n_sep_by_space: ::c_char,
            pub p_sign_posn: ::c_char,
            pub n_sign_posn: ::c_char,
            pub int_p_cs_precedes: ::c_char,
            pub int_p_sep_by_space: ::c_char,
            pub int_n_cs_precedes: ::c_char,
            pub int_n_sep_by_space: ::c_char,
            pub int_p_sign_posn: ::c_char,
            pub int_n_sign_posn: ::c_char,
        }

        pub struct in_pktinfo {
            pub ipi_ifindex: ::c_int,
            pub ipi_spec_dst: ::in_addr,
            pub ipi_addr: ::in_addr,
        }

        pub struct ifaddrs {
            pub ifa_next: *mut ifaddrs,
            pub ifa_name: *mut c_char,
            pub ifa_flags: ::c_uint,
            pub ifa_addr: *mut ::sockaddr,
            pub ifa_netmask: *mut ::sockaddr,
            pub ifa_ifu: *mut ::sockaddr, // FIXME This should be a union
            pub ifa_data: *mut ::c_void
        }

        pub struct in6_rtmsg {
            rtmsg_dst: ::in6_addr,
            rtmsg_src: ::in6_addr,
            rtmsg_gateway: ::in6_addr,
            rtmsg_type: u32,
            rtmsg_dst_len: u16,
            rtmsg_src_len: u16,
            rtmsg_metric: u32,
            rtmsg_info: ::c_ulong,
            rtmsg_flags: u32,
            rtmsg_ifindex: ::c_int,
        }

        pub struct arpreq {
            pub arp_pa: ::sockaddr,
            pub arp_ha: ::sockaddr,
            pub arp_flags: ::c_int,
            pub arp_netmask: ::sockaddr,
            pub arp_dev: [::c_char; 16],
        }

        pub struct arpreq_old {
            pub arp_pa: ::sockaddr,
            pub arp_ha: ::sockaddr,
            pub arp_flags: ::c_int,
            pub arp_netmask: ::sockaddr,
        }

        pub struct arphdr {
            pub ar_hrd: u16,
            pub ar_pro: u16,
            pub ar_hln: u8,
            pub ar_pln: u8,
            pub ar_op: u16,
        }

        pub struct mmsghdr {
            pub msg_hdr: ::msghdr,
            pub msg_len: ::c_uint,
        }
    }

    s_no_extra_traits!{
        #[cfg_attr(
            any(
                all(
                    target_arch = "x86",
                    not(target_env = "musl"),
                    not(target_os = "android")),
                target_arch = "x86_64"),
            repr(packed))]
        pub struct epoll_event {
            pub events: u32,
            pub u64: u64,
        }

        pub struct sockaddr_un {
            pub sun_family: sa_family_t,
            pub sun_path: [::c_char; 108]
        }

        pub struct sockaddr_storage {
            pub ss_family: sa_family_t,
            __ss_align: ::size_t,
            #[cfg(target_pointer_width = "32")]
            __ss_pad2: [u8; 128 - 2 * 4],
            #[cfg(target_pointer_width = "64")]
            __ss_pad2: [u8; 128 - 2 * 8],
        }

        pub struct utsname {
            pub sysname: [::c_char; 65],
            pub nodename: [::c_char; 65],
            pub release: [::c_char; 65],
            pub version: [::c_char; 65],
            pub machine: [::c_char; 65],
            pub domainname: [::c_char; 65]
        }

        pub struct sigevent {
            pub sigev_value: ::sigval,
            pub sigev_signo: ::c_int,
            pub sigev_notify: ::c_int,
            // Actually a union.  We only expose sigev_notify_thread_id because it's
            // the most useful member
            pub sigev_notify_thread_id: ::c_int,
            #[cfg(target_pointer_width = "64")]
            __unused1: [::c_int; 11],
            #[cfg(target_pointer_width = "32")]
            __unused1: [::c_int; 12]
        }
    }

    cfg_if! {
        if #[cfg(feature = "extra_traits")] {
            impl PartialEq for epoll_event {
                fn eq(&self, other: &epoll_event) -> bool {
                    self.events == other.events
                        && self.u64 == other.u64
                }
            }
            impl Eq for epoll_event {}
            impl ::fmt::Debug for epoll_event {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    let events = self.events;
                    let u64 = self.u64;
                    f.debug_struct("epoll_event")
                        .field("events", &events)
                        .field("u64", &u64)
                        .finish()
                }
            }
            impl ::hash::Hash for epoll_event {
                fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                    let events = self.events;
                    let u64 = self.u64;
                    events.hash(state);
                    u64.hash(state);
                }
            }

            impl PartialEq for sockaddr_un {
                fn eq(&self, other: &sockaddr_un) -> bool {
                    self.sun_family == other.sun_family
                        && self
                        .sun_path
                        .iter()
                        .zip(other.sun_path.iter())
                        .all(|(a, b)| a == b)
                }
            }
            impl Eq for sockaddr_un {}
            impl ::fmt::Debug for sockaddr_un {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    f.debug_struct("sockaddr_un")
                        .field("sun_family", &self.sun_family)
                    // FIXME: .field("sun_path", &self.sun_path)
                        .finish()
                }
            }
            impl ::hash::Hash for sockaddr_un {
                fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                    self.sun_family.hash(state);
                    self.sun_path.hash(state);
                }
            }

            impl PartialEq for sockaddr_storage {
                fn eq(&self, other: &sockaddr_storage) -> bool {
                    self.ss_family == other.ss_family
                        && self
                        .__ss_pad2
                        .iter()
                        .zip(other.__ss_pad2.iter())
                        .all(|(a, b)| a == b)
                }
            }

            impl Eq for sockaddr_storage {}

            impl ::fmt::Debug for sockaddr_storage {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    f.debug_struct("sockaddr_storage")
                        .field("ss_family", &self.ss_family)
                        .field("__ss_align", &self.__ss_align)
                    // FIXME: .field("__ss_pad2", &self.__ss_pad2)
                        .finish()
                }
            }

            impl ::hash::Hash for sockaddr_storage {
                fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                    self.ss_family.hash(state);
                    self.__ss_pad2.hash(state);
                }
            }

            impl PartialEq for utsname {
                fn eq(&self, other: &utsname) -> bool {
                    self.sysname
                        .iter()
                        .zip(other.sysname.iter())
                        .all(|(a, b)| a == b)
                        && self
                        .nodename
                        .iter()
                        .zip(other.nodename.iter())
                        .all(|(a, b)| a == b)
                        && self
                        .release
                        .iter()
                        .zip(other.release.iter())
                        .all(|(a, b)| a == b)
                        && self
                        .version
                        .iter()
                        .zip(other.version.iter())
                        .all(|(a, b)| a == b)
                        && self
                        .machine
                        .iter()
                        .zip(other.machine.iter())
                        .all(|(a, b)| a == b)
                        && self
                        .domainname
                        .iter()
                        .zip(other.domainname.iter())
                        .all(|(a, b)| a == b)
                }
            }

            impl Eq for utsname {}

            impl ::fmt::Debug for utsname {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    f.debug_struct("utsname")
                    // FIXME: .field("sysname", &self.sysname)
                    // FIXME: .field("nodename", &self.nodename)
                    // FIXME: .field("release", &self.release)
                    // FIXME: .field("version", &self.version)
                    // FIXME: .field("machine", &self.machine)
                    // FIXME: .field("domainname", &self.domainname)
                        .finish()
                }
            }

            impl ::hash::Hash for utsname {
                fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                    self.sysname.hash(state);
                    self.nodename.hash(state);
                    self.release.hash(state);
                    self.version.hash(state);
                    self.machine.hash(state);
                    self.domainname.hash(state);
                }
            }

            impl PartialEq for sigevent {
                fn eq(&self, other: &sigevent) -> bool {
                    self.sigev_value == other.sigev_value
                        && self.sigev_signo == other.sigev_signo
                        && self.sigev_notify == other.sigev_notify
                        && self.sigev_notify_thread_id
                            == other.sigev_notify_thread_id
                }
            }
            impl Eq for sigevent {}
            impl ::fmt::Debug for sigevent {
                fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
                    f.debug_struct("sigevent")
                        .field("sigev_value", &self.sigev_value)
                        .field("sigev_signo", &self.sigev_signo)
                        .field("sigev_notify", &self.sigev_notify)
                        .field("sigev_notify_thread_id",
                               &self.sigev_notify_thread_id)
                        .finish()
                }
            }
            impl ::hash::Hash for sigevent {
                fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
                    self.sigev_value.hash(state);
                    self.sigev_signo.hash(state);
                    self.sigev_notify.hash(state);
                    self.sigev_notify_thread_id.hash(state);
                }
            }
        }
    }

    // intentionally not public, only used for fd_set
    cfg_if! {
        if #[cfg(target_pointer_width = "32")] {
            const ULONG_SIZE: usize = 32;
        } else if #[cfg(target_pointer_width = "64")] {
            const ULONG_SIZE: usize = 64;
        } else {
            // Unknown target_pointer_width
        }
    }

    pub const EXIT_FAILURE: ::c_int = 1;
    pub const EXIT_SUCCESS: ::c_int = 0;
    pub const RAND_MAX: ::c_int = 2147483647;
    pub const EOF: ::c_int = -1;
    pub const SEEK_SET: ::c_int = 0;
    pub const SEEK_CUR: ::c_int = 1;
    pub const SEEK_END: ::c_int = 2;
    pub const _IOFBF: ::c_int = 0;
    pub const _IONBF: ::c_int = 2;
    pub const _IOLBF: ::c_int = 1;

    pub const F_DUPFD: ::c_int = 0;
    pub const F_GETFD: ::c_int = 1;
    pub const F_SETFD: ::c_int = 2;
    pub const F_GETFL: ::c_int = 3;
    pub const F_SETFL: ::c_int = 4;

    // Linux-specific fcntls
    pub const F_SETLEASE: ::c_int = 1024;
    pub const F_GETLEASE: ::c_int = 1025;
    pub const F_NOTIFY: ::c_int = 1026;
    pub const F_CANCELLK: ::c_int = 1029;
    pub const F_DUPFD_CLOEXEC: ::c_int = 1030;
    pub const F_SETPIPE_SZ: ::c_int = 1031;
    pub const F_GETPIPE_SZ: ::c_int = 1032;
    pub const F_ADD_SEALS: ::c_int = 1033;
    pub const F_GET_SEALS: ::c_int = 1034;

    pub const F_SEAL_SEAL: ::c_int = 0x0001;
    pub const F_SEAL_SHRINK: ::c_int = 0x0002;
    pub const F_SEAL_GROW: ::c_int = 0x0004;
    pub const F_SEAL_WRITE: ::c_int = 0x0008;

    // TODO(#235): Include file sealing fcntls once we have a way to verify them.

    pub const SIGTRAP: ::c_int = 5;

    pub const PTHREAD_CREATE_JOINABLE: ::c_int = 0;
    pub const PTHREAD_CREATE_DETACHED: ::c_int = 1;

    pub const CLOCK_REALTIME: ::clockid_t = 0;
    pub const CLOCK_MONOTONIC: ::clockid_t = 1;
    pub const CLOCK_PROCESS_CPUTIME_ID: ::clockid_t = 2;
    pub const CLOCK_THREAD_CPUTIME_ID: ::clockid_t = 3;
    pub const CLOCK_MONOTONIC_RAW: ::clockid_t = 4;
    pub const CLOCK_REALTIME_COARSE: ::clockid_t = 5;
    pub const CLOCK_MONOTONIC_COARSE: ::clockid_t = 6;
    pub const CLOCK_BOOTTIME: ::clockid_t = 7;
    pub const CLOCK_REALTIME_ALARM: ::clockid_t = 8;
    pub const CLOCK_BOOTTIME_ALARM: ::clockid_t = 9;
    // TODO(#247) Someday our Travis shall have glibc 2.21 (released in Sep
    // 2014.) See also musl/mod.rs
    // pub const CLOCK_SGI_CYCLE: ::clockid_t = 10;
    // pub const CLOCK_TAI: ::clockid_t = 11;
    pub const TIMER_ABSTIME: ::c_int = 1;

    pub const RUSAGE_SELF: ::c_int = 0;

    pub const O_RDONLY: ::c_int = 0;
    pub const O_WRONLY: ::c_int = 1;
    pub const O_RDWR: ::c_int = 2;

    pub const SOCK_CLOEXEC: ::c_int = O_CLOEXEC;

    pub const S_IFIFO: ::mode_t = 4096;
    pub const S_IFCHR: ::mode_t = 8192;
    pub const S_IFBLK: ::mode_t = 24576;
    pub const S_IFDIR: ::mode_t = 16384;
    pub const S_IFREG: ::mode_t = 32768;
    pub const S_IFLNK: ::mode_t = 40960;
    pub const S_IFSOCK: ::mode_t = 49152;
    pub const S_IFMT: ::mode_t = 61440;
    pub const S_IRWXU: ::mode_t = 448;
    pub const S_IXUSR: ::mode_t = 64;
    pub const S_IWUSR: ::mode_t = 128;
    pub const S_IRUSR: ::mode_t = 256;
    pub const S_IRWXG: ::mode_t = 56;
    pub const S_IXGRP: ::mode_t = 8;
    pub const S_IWGRP: ::mode_t = 16;
    pub const S_IRGRP: ::mode_t = 32;
    pub const S_IRWXO: ::mode_t = 7;
    pub const S_IXOTH: ::mode_t = 1;
    pub const S_IWOTH: ::mode_t = 2;
    pub const S_IROTH: ::mode_t = 4;
    pub const F_OK: ::c_int = 0;
    pub const R_OK: ::c_int = 4;
    pub const W_OK: ::c_int = 2;
    pub const X_OK: ::c_int = 1;
    pub const STDIN_FILENO: ::c_int = 0;
    pub const STDOUT_FILENO: ::c_int = 1;
    pub const STDERR_FILENO: ::c_int = 2;
    pub const SIGHUP: ::c_int = 1;
    pub const SIGINT: ::c_int = 2;
    pub const SIGQUIT: ::c_int = 3;
    pub const SIGILL: ::c_int = 4;
    pub const SIGABRT: ::c_int = 6;
    pub const SIGFPE: ::c_int = 8;
    pub const SIGKILL: ::c_int = 9;
    pub const SIGSEGV: ::c_int = 11;
    pub const SIGPIPE: ::c_int = 13;
    pub const SIGALRM: ::c_int = 14;
    pub const SIGTERM: ::c_int = 15;

    pub const PROT_NONE: ::c_int = 0;
    pub const PROT_READ: ::c_int = 1;
    pub const PROT_WRITE: ::c_int = 2;
    pub const PROT_EXEC: ::c_int = 4;

    pub const LC_CTYPE: ::c_int = 0;
    pub const LC_NUMERIC: ::c_int = 1;
    pub const LC_TIME: ::c_int = 2;
    pub const LC_COLLATE: ::c_int = 3;
    pub const LC_MONETARY: ::c_int = 4;
    pub const LC_MESSAGES: ::c_int = 5;
    pub const LC_ALL: ::c_int = 6;
    pub const LC_CTYPE_MASK: ::c_int = (1 << LC_CTYPE);
    pub const LC_NUMERIC_MASK: ::c_int = (1 << LC_NUMERIC);
    pub const LC_TIME_MASK: ::c_int = (1 << LC_TIME);
    pub const LC_COLLATE_MASK: ::c_int = (1 << LC_COLLATE);
    pub const LC_MONETARY_MASK: ::c_int = (1 << LC_MONETARY);
    pub const LC_MESSAGES_MASK: ::c_int = (1 << LC_MESSAGES);
    // LC_ALL_MASK defined per platform

    pub const MAP_FILE: ::c_int = 0x0000;
    pub const MAP_SHARED: ::c_int = 0x0001;
    pub const MAP_PRIVATE: ::c_int = 0x0002;
    pub const MAP_FIXED: ::c_int = 0x0010;

    pub const MAP_FAILED: *mut ::c_void = !0 as *mut ::c_void;

    // MS_ flags for msync(2)
    pub const MS_ASYNC: ::c_int = 0x0001;
    pub const MS_INVALIDATE: ::c_int = 0x0002;
    pub const MS_SYNC: ::c_int = 0x0004;

    // MS_ flags for mount(2)
    pub const MS_RDONLY: ::c_ulong = 0x01;
    pub const MS_NOSUID: ::c_ulong = 0x02;
    pub const MS_NODEV: ::c_ulong = 0x04;
    pub const MS_NOEXEC: ::c_ulong = 0x08;
    pub const MS_SYNCHRONOUS: ::c_ulong = 0x10;
    pub const MS_REMOUNT: ::c_ulong = 0x20;
    pub const MS_MANDLOCK: ::c_ulong = 0x40;
    pub const MS_DIRSYNC: ::c_ulong = 0x80;
    pub const MS_NOATIME: ::c_ulong = 0x0400;
    pub const MS_NODIRATIME: ::c_ulong = 0x0800;
    pub const MS_BIND: ::c_ulong = 0x1000;
    pub const MS_MOVE: ::c_ulong = 0x2000;
    pub const MS_REC: ::c_ulong = 0x4000;
    pub const MS_SILENT: ::c_ulong = 0x8000;
    pub const MS_POSIXACL: ::c_ulong = 0x010000;
    pub const MS_UNBINDABLE: ::c_ulong = 0x020000;
    pub const MS_PRIVATE: ::c_ulong = 0x040000;
    pub const MS_SLAVE: ::c_ulong = 0x080000;
    pub const MS_SHARED: ::c_ulong = 0x100000;
    pub const MS_RELATIME: ::c_ulong = 0x200000;
    pub const MS_KERNMOUNT: ::c_ulong = 0x400000;
    pub const MS_I_VERSION: ::c_ulong = 0x800000;
    pub const MS_STRICTATIME: ::c_ulong = 0x1000000;
    pub const MS_ACTIVE: ::c_ulong = 0x40000000;
    pub const MS_MGC_VAL: ::c_ulong = 0xc0ed0000;
    pub const MS_MGC_MSK: ::c_ulong = 0xffff0000;

    pub const EPERM: ::c_int = 1;
    pub const ENOENT: ::c_int = 2;
    pub const ESRCH: ::c_int = 3;
    pub const EINTR: ::c_int = 4;
    pub const EIO: ::c_int = 5;
    pub const ENXIO: ::c_int = 6;
    pub const E2BIG: ::c_int = 7;
    pub const ENOEXEC: ::c_int = 8;
    pub const EBADF: ::c_int = 9;
    pub const ECHILD: ::c_int = 10;
    pub const EAGAIN: ::c_int = 11;
    pub const ENOMEM: ::c_int = 12;
    pub const EACCES: ::c_int = 13;
    pub const EFAULT: ::c_int = 14;
    pub const ENOTBLK: ::c_int = 15;
    pub const EBUSY: ::c_int = 16;
    pub const EEXIST: ::c_int = 17;
    pub const EXDEV: ::c_int = 18;
    pub const ENODEV: ::c_int = 19;
    pub const ENOTDIR: ::c_int = 20;
    pub const EISDIR: ::c_int = 21;
    pub const EINVAL: ::c_int = 22;
    pub const ENFILE: ::c_int = 23;
    pub const EMFILE: ::c_int = 24;
    pub const ENOTTY: ::c_int = 25;
    pub const ETXTBSY: ::c_int = 26;
    pub const EFBIG: ::c_int = 27;
    pub const ENOSPC: ::c_int = 28;
    pub const ESPIPE: ::c_int = 29;
    pub const EROFS: ::c_int = 30;
    pub const EMLINK: ::c_int = 31;
    pub const EPIPE: ::c_int = 32;
    pub const EDOM: ::c_int = 33;
    pub const ERANGE: ::c_int = 34;
    pub const EWOULDBLOCK: ::c_int = EAGAIN;

    pub const SCM_RIGHTS: ::c_int = 0x01;
    pub const SCM_CREDENTIALS: ::c_int = 0x02;

    pub const PROT_GROWSDOWN: ::c_int = 0x1000000;
    pub const PROT_GROWSUP: ::c_int = 0x2000000;

    pub const MAP_TYPE: ::c_int = 0x000f;

    pub const MADV_NORMAL: ::c_int = 0;
    pub const MADV_RANDOM: ::c_int = 1;
    pub const MADV_SEQUENTIAL: ::c_int = 2;
    pub const MADV_WILLNEED: ::c_int = 3;
    pub const MADV_DONTNEED: ::c_int = 4;
    pub const MADV_FREE: ::c_int = 8;
    pub const MADV_REMOVE: ::c_int = 9;
    pub const MADV_DONTFORK: ::c_int = 10;
    pub const MADV_DOFORK: ::c_int = 11;
    pub const MADV_MERGEABLE: ::c_int = 12;
    pub const MADV_UNMERGEABLE: ::c_int = 13;
    pub const MADV_HUGEPAGE: ::c_int = 14;
    pub const MADV_NOHUGEPAGE: ::c_int = 15;
    pub const MADV_DONTDUMP: ::c_int = 16;
    pub const MADV_DODUMP: ::c_int = 17;
    pub const MADV_HWPOISON: ::c_int = 100;

    pub const IFF_UP: ::c_int = 0x1;
    pub const IFF_BROADCAST: ::c_int = 0x2;
    pub const IFF_DEBUG: ::c_int = 0x4;
    pub const IFF_LOOPBACK: ::c_int = 0x8;
    pub const IFF_POINTOPOINT: ::c_int = 0x10;
    pub const IFF_NOTRAILERS: ::c_int = 0x20;
    pub const IFF_RUNNING: ::c_int = 0x40;
    pub const IFF_NOARP: ::c_int = 0x80;
    pub const IFF_PROMISC: ::c_int = 0x100;
    pub const IFF_ALLMULTI: ::c_int = 0x200;
    pub const IFF_MASTER: ::c_int = 0x400;
    pub const IFF_SLAVE: ::c_int = 0x800;
    pub const IFF_MULTICAST: ::c_int = 0x1000;
    pub const IFF_PORTSEL: ::c_int = 0x2000;
    pub const IFF_AUTOMEDIA: ::c_int = 0x4000;
    pub const IFF_DYNAMIC: ::c_int = 0x8000;

    pub const SOL_IP: ::c_int = 0;
    pub const SOL_TCP: ::c_int = 6;
    pub const SOL_UDP: ::c_int = 17;
    pub const SOL_IPV6: ::c_int = 41;
    pub const SOL_ICMPV6: ::c_int = 58;
    pub const SOL_RAW: ::c_int = 255;
    pub const SOL_DECNET: ::c_int = 261;
    pub const SOL_X25: ::c_int = 262;
    pub const SOL_PACKET: ::c_int = 263;
    pub const SOL_ATM: ::c_int = 264;
    pub const SOL_AAL: ::c_int = 265;
    pub const SOL_IRDA: ::c_int = 266;
    pub const SOL_NETBEUI: ::c_int = 267;
    pub const SOL_LLC: ::c_int = 268;
    pub const SOL_DCCP: ::c_int = 269;
    pub const SOL_NETLINK: ::c_int = 270;
    pub const SOL_TIPC: ::c_int = 271;
    pub const SOL_BLUETOOTH: ::c_int = 274;
    pub const SOL_ALG: ::c_int = 279;

    pub const AF_UNSPEC: ::c_int = 0;
    pub const AF_UNIX: ::c_int = 1;
    pub const AF_LOCAL: ::c_int = 1;
    pub const AF_INET: ::c_int = 2;
    pub const AF_AX25: ::c_int = 3;
    pub const AF_IPX: ::c_int = 4;
    pub const AF_APPLETALK: ::c_int = 5;
    pub const AF_NETROM: ::c_int = 6;
    pub const AF_BRIDGE: ::c_int = 7;
    pub const AF_ATMPVC: ::c_int = 8;
    pub const AF_X25: ::c_int = 9;
    pub const AF_INET6: ::c_int = 10;
    pub const AF_ROSE: ::c_int = 11;
    pub const AF_DECnet: ::c_int = 12;
    pub const AF_NETBEUI: ::c_int = 13;
    pub const AF_SECURITY: ::c_int = 14;
    pub const AF_KEY: ::c_int = 15;
    pub const AF_NETLINK: ::c_int = 16;
    pub const AF_ROUTE: ::c_int = AF_NETLINK;
    pub const AF_PACKET: ::c_int = 17;
    pub const AF_ASH: ::c_int = 18;
    pub const AF_ECONET: ::c_int = 19;
    pub const AF_ATMSVC: ::c_int = 20;
    pub const AF_RDS: ::c_int = 21;
    pub const AF_SNA: ::c_int = 22;
    pub const AF_IRDA: ::c_int = 23;
    pub const AF_PPPOX: ::c_int = 24;
    pub const AF_WANPIPE: ::c_int = 25;
    pub const AF_LLC: ::c_int = 26;
    pub const AF_CAN: ::c_int = 29;
    pub const AF_TIPC: ::c_int = 30;
    pub const AF_BLUETOOTH: ::c_int = 31;
    pub const AF_IUCV: ::c_int = 32;
    pub const AF_RXRPC: ::c_int = 33;
    pub const AF_ISDN: ::c_int = 34;
    pub const AF_PHONET: ::c_int = 35;
    pub const AF_IEEE802154: ::c_int = 36;
    pub const AF_CAIF: ::c_int = 37;
    pub const AF_ALG: ::c_int = 38;

    pub const PF_UNSPEC: ::c_int = AF_UNSPEC;
    pub const PF_UNIX: ::c_int = AF_UNIX;
    pub const PF_LOCAL: ::c_int = AF_LOCAL;
    pub const PF_INET: ::c_int = AF_INET;
    pub const PF_AX25: ::c_int = AF_AX25;
    pub const PF_IPX: ::c_int = AF_IPX;
    pub const PF_APPLETALK: ::c_int = AF_APPLETALK;
    pub const PF_NETROM: ::c_int = AF_NETROM;
    pub const PF_BRIDGE: ::c_int = AF_BRIDGE;
    pub const PF_ATMPVC: ::c_int = AF_ATMPVC;
    pub const PF_X25: ::c_int = AF_X25;
    pub const PF_INET6: ::c_int = AF_INET6;
    pub const PF_ROSE: ::c_int = AF_ROSE;
    pub const PF_DECnet: ::c_int = AF_DECnet;
    pub const PF_NETBEUI: ::c_int = AF_NETBEUI;
    pub const PF_SECURITY: ::c_int = AF_SECURITY;
    pub const PF_KEY: ::c_int = AF_KEY;
    pub const PF_NETLINK: ::c_int = AF_NETLINK;
    pub const PF_ROUTE: ::c_int = AF_ROUTE;
    pub const PF_PACKET: ::c_int = AF_PACKET;
    pub const PF_ASH: ::c_int = AF_ASH;
    pub const PF_ECONET: ::c_int = AF_ECONET;
    pub const PF_ATMSVC: ::c_int = AF_ATMSVC;
    pub const PF_RDS: ::c_int = AF_RDS;
    pub const PF_SNA: ::c_int = AF_SNA;
    pub const PF_IRDA: ::c_int = AF_IRDA;
    pub const PF_PPPOX: ::c_int = AF_PPPOX;
    pub const PF_WANPIPE: ::c_int = AF_WANPIPE;
    pub const PF_LLC: ::c_int = AF_LLC;
    pub const PF_CAN: ::c_int = AF_CAN;
    pub const PF_TIPC: ::c_int = AF_TIPC;
    pub const PF_BLUETOOTH: ::c_int = AF_BLUETOOTH;
    pub const PF_IUCV: ::c_int = AF_IUCV;
    pub const PF_RXRPC: ::c_int = AF_RXRPC;
    pub const PF_ISDN: ::c_int = AF_ISDN;
    pub const PF_PHONET: ::c_int = AF_PHONET;
    pub const PF_IEEE802154: ::c_int = AF_IEEE802154;
    pub const PF_CAIF: ::c_int = AF_CAIF;
    pub const PF_ALG: ::c_int = AF_ALG;

    pub const SOMAXCONN: ::c_int = 128;

    pub const MSG_OOB: ::c_int = 1;
    pub const MSG_PEEK: ::c_int = 2;
    pub const MSG_DONTROUTE: ::c_int = 4;
    pub const MSG_CTRUNC: ::c_int = 8;
    pub const MSG_TRUNC: ::c_int = 0x20;
    pub const MSG_DONTWAIT: ::c_int = 0x40;
    pub const MSG_EOR: ::c_int = 0x80;
    pub const MSG_WAITALL: ::c_int = 0x100;
    pub const MSG_FIN: ::c_int = 0x200;
    pub const MSG_SYN: ::c_int = 0x400;
    pub const MSG_CONFIRM: ::c_int = 0x800;
    pub const MSG_RST: ::c_int = 0x1000;
    pub const MSG_ERRQUEUE: ::c_int = 0x2000;
    pub const MSG_NOSIGNAL: ::c_int = 0x4000;
    pub const MSG_MORE: ::c_int = 0x8000;
    pub const MSG_WAITFORONE: ::c_int = 0x10000;
    pub const MSG_FASTOPEN: ::c_int = 0x20000000;
    pub const MSG_CMSG_CLOEXEC: ::c_int = 0x40000000;

    pub const SCM_TIMESTAMP: ::c_int = SO_TIMESTAMP;

    pub const SOCK_RAW: ::c_int = 3;
    pub const SOCK_RDM: ::c_int = 4;
    pub const IP_MULTICAST_IF: ::c_int = 32;
    pub const IP_MULTICAST_TTL: ::c_int = 33;
    pub const IP_MULTICAST_LOOP: ::c_int = 34;
    pub const IP_TOS: ::c_int = 1;
    pub const IP_TTL: ::c_int = 2;
    pub const IP_HDRINCL: ::c_int = 3;
    pub const IP_PKTINFO: ::c_int = 8;
    pub const IP_RECVTOS: ::c_int = 13;
    pub const IP_ADD_MEMBERSHIP: ::c_int = 35;
    pub const IP_DROP_MEMBERSHIP: ::c_int = 36;
    pub const IP_TRANSPARENT: ::c_int = 19;
    pub const IPV6_UNICAST_HOPS: ::c_int = 16;
    pub const IPV6_MULTICAST_IF: ::c_int = 17;
    pub const IPV6_MULTICAST_HOPS: ::c_int = 18;
    pub const IPV6_MULTICAST_LOOP: ::c_int = 19;
    pub const IPV6_ADD_MEMBERSHIP: ::c_int = 20;
    pub const IPV6_DROP_MEMBERSHIP: ::c_int = 21;
    pub const IPV6_V6ONLY: ::c_int = 26;
    pub const IPV6_RECVPKTINFO: ::c_int = 49;
    pub const IPV6_PKTINFO: ::c_int = 50;
    pub const IPV6_RECVTCLASS: ::c_int = 66;
    pub const IPV6_TCLASS: ::c_int = 67;

    pub const TCP_NODELAY: ::c_int = 1;
    pub const TCP_MAXSEG: ::c_int = 2;
    pub const TCP_CORK: ::c_int = 3;
    pub const TCP_KEEPIDLE: ::c_int = 4;
    pub const TCP_KEEPINTVL: ::c_int = 5;
    pub const TCP_KEEPCNT: ::c_int = 6;
    pub const TCP_SYNCNT: ::c_int = 7;
    pub const TCP_LINGER2: ::c_int = 8;
    pub const TCP_DEFER_ACCEPT: ::c_int = 9;
    pub const TCP_WINDOW_CLAMP: ::c_int = 10;
    pub const TCP_INFO: ::c_int = 11;
    pub const TCP_QUICKACK: ::c_int = 12;
    pub const TCP_CONGESTION: ::c_int = 13;

    pub const SO_DEBUG: ::c_int = 1;

    pub const SHUT_RD: ::c_int = 0;
    pub const SHUT_WR: ::c_int = 1;
    pub const SHUT_RDWR: ::c_int = 2;

    pub const LOCK_SH: ::c_int = 1;
    pub const LOCK_EX: ::c_int = 2;
    pub const LOCK_NB: ::c_int = 4;
    pub const LOCK_UN: ::c_int = 8;

    pub const SS_ONSTACK: ::c_int = 1;
    pub const SS_DISABLE: ::c_int = 2;

    pub const PATH_MAX: ::c_int = 4096;

    pub const FD_SETSIZE: usize = 1024;

    pub const EPOLLIN: ::c_int = 0x1;
    pub const EPOLLPRI: ::c_int = 0x2;
    pub const EPOLLOUT: ::c_int = 0x4;
    pub const EPOLLRDNORM: ::c_int = 0x40;
    pub const EPOLLRDBAND: ::c_int = 0x80;
    pub const EPOLLWRNORM: ::c_int = 0x100;
    pub const EPOLLWRBAND: ::c_int = 0x200;
    pub const EPOLLMSG: ::c_int = 0x400;
    pub const EPOLLERR: ::c_int = 0x8;
    pub const EPOLLHUP: ::c_int = 0x10;
    pub const EPOLLET: ::c_int = 0x80000000;

    pub const EPOLL_CTL_ADD: ::c_int = 1;
    pub const EPOLL_CTL_MOD: ::c_int = 3;
    pub const EPOLL_CTL_DEL: ::c_int = 2;

    pub const MNT_DETACH: ::c_int = 0x2;
    pub const MNT_EXPIRE: ::c_int = 0x4;

    pub const Q_GETFMT: ::c_int = 0x800004;
    pub const Q_GETINFO: ::c_int = 0x800005;
    pub const Q_SETINFO: ::c_int = 0x800006;
    pub const QIF_BLIMITS: u32 = 1;
    pub const QIF_SPACE: u32 = 2;
    pub const QIF_ILIMITS: u32 = 4;
    pub const QIF_INODES: u32 = 8;
    pub const QIF_BTIME: u32 = 16;
    pub const QIF_ITIME: u32 = 32;
    pub const QIF_LIMITS: u32 = 5;
    pub const QIF_USAGE: u32 = 10;
    pub const QIF_TIMES: u32 = 48;
    pub const QIF_ALL: u32 = 63;

    pub const MNT_FORCE: ::c_int = 0x1;

    pub const Q_SYNC: ::c_int = 0x800001;
    pub const Q_QUOTAON: ::c_int = 0x800002;
    pub const Q_QUOTAOFF: ::c_int = 0x800003;
    pub const Q_GETQUOTA: ::c_int = 0x800007;
    pub const Q_SETQUOTA: ::c_int = 0x800008;

    pub const TCIOFF: ::c_int = 2;
    pub const TCION: ::c_int = 3;
    pub const TCOOFF: ::c_int = 0;
    pub const TCOON: ::c_int = 1;
    pub const TCIFLUSH: ::c_int = 0;
    pub const TCOFLUSH: ::c_int = 1;
    pub const TCIOFLUSH: ::c_int = 2;
    pub const NL0: ::tcflag_t = 0x00000000;
    pub const NL1: ::tcflag_t = 0x00000100;
    pub const TAB0: ::tcflag_t = 0x00000000;
    pub const CR0: ::tcflag_t = 0x00000000;
    pub const FF0: ::tcflag_t = 0x00000000;
    pub const BS0: ::tcflag_t = 0x00000000;
    pub const VT0: ::tcflag_t = 0x00000000;
    pub const VERASE: usize = 2;
    pub const VKILL: usize = 3;
    pub const VINTR: usize = 0;
    pub const VQUIT: usize = 1;
    pub const VLNEXT: usize = 15;
    pub const IGNBRK: ::tcflag_t = 0x00000001;
    pub const BRKINT: ::tcflag_t = 0x00000002;
    pub const IGNPAR: ::tcflag_t = 0x00000004;
    pub const PARMRK: ::tcflag_t = 0x00000008;
    pub const INPCK: ::tcflag_t = 0x00000010;
    pub const ISTRIP: ::tcflag_t = 0x00000020;
    pub const INLCR: ::tcflag_t = 0x00000040;
    pub const IGNCR: ::tcflag_t = 0x00000080;
    pub const ICRNL: ::tcflag_t = 0x00000100;
    pub const IXANY: ::tcflag_t = 0x00000800;
    pub const IMAXBEL: ::tcflag_t = 0x00002000;
    pub const OPOST: ::tcflag_t = 0x1;
    pub const CS5: ::tcflag_t = 0x00000000;
    pub const CRTSCTS: ::tcflag_t = 0x80000000;
    pub const ECHO: ::tcflag_t = 0x00000008;
    pub const OCRNL:  ::tcflag_t = 0o000010;
    pub const ONOCR:  ::tcflag_t = 0o000020;
    pub const ONLRET: ::tcflag_t = 0o000040;
    pub const OFILL:  ::tcflag_t = 0o000100;
    pub const OFDEL:  ::tcflag_t = 0o000200;

    pub const CLONE_VM: ::c_int = 0x100;
    pub const CLONE_FS: ::c_int = 0x200;
    pub const CLONE_FILES: ::c_int = 0x400;
    pub const CLONE_SIGHAND: ::c_int = 0x800;
    pub const CLONE_PTRACE: ::c_int = 0x2000;
    pub const CLONE_VFORK: ::c_int = 0x4000;
    pub const CLONE_PARENT: ::c_int = 0x8000;
    pub const CLONE_THREAD: ::c_int = 0x10000;
    pub const CLONE_NEWNS: ::c_int = 0x20000;
    pub const CLONE_SYSVSEM: ::c_int = 0x40000;
    pub const CLONE_SETTLS: ::c_int = 0x80000;
    pub const CLONE_PARENT_SETTID: ::c_int = 0x100000;
    pub const CLONE_CHILD_CLEARTID: ::c_int = 0x200000;
    pub const CLONE_DETACHED: ::c_int = 0x400000;
    pub const CLONE_UNTRACED: ::c_int = 0x800000;
    pub const CLONE_CHILD_SETTID: ::c_int = 0x01000000;
    pub const CLONE_NEWUTS: ::c_int = 0x04000000;
    pub const CLONE_NEWIPC: ::c_int = 0x08000000;
    pub const CLONE_NEWUSER: ::c_int = 0x10000000;
    pub const CLONE_NEWPID: ::c_int = 0x20000000;
    pub const CLONE_NEWNET: ::c_int = 0x40000000;
    pub const CLONE_IO: ::c_int = 0x80000000;
    pub const CLONE_NEWCGROUP: ::c_int = 0x02000000;

    pub const WNOHANG: ::c_int = 0x00000001;
    pub const WUNTRACED: ::c_int = 0x00000002;
    pub const WSTOPPED: ::c_int = WUNTRACED;
    pub const WEXITED: ::c_int = 0x00000004;
    pub const WCONTINUED: ::c_int = 0x00000008;
    pub const WNOWAIT: ::c_int = 0x01000000;

    // Options set using PTRACE_SETOPTIONS.
    pub const PTRACE_O_TRACESYSGOOD: ::c_int = 0x00000001;
    pub const PTRACE_O_TRACEFORK: ::c_int = 0x00000002;
    pub const PTRACE_O_TRACEVFORK: ::c_int = 0x00000004;
    pub const PTRACE_O_TRACECLONE: ::c_int = 0x00000008;
    pub const PTRACE_O_TRACEEXEC: ::c_int = 0x00000010;
    pub const PTRACE_O_TRACEVFORKDONE: ::c_int = 0x00000020;
    pub const PTRACE_O_TRACEEXIT: ::c_int = 0x00000040;
    pub const PTRACE_O_TRACESECCOMP: ::c_int = 0x00000080;
    pub const PTRACE_O_EXITKILL: ::c_int = 0x00100000;
    pub const PTRACE_O_SUSPEND_SECCOMP: ::c_int = 0x00200000;
    pub const PTRACE_O_MASK: ::c_int = 0x003000ff;

    // Wait extended result codes for the above trace options.
    pub const PTRACE_EVENT_FORK: ::c_int = 1;
    pub const PTRACE_EVENT_VFORK: ::c_int = 2;
    pub const PTRACE_EVENT_CLONE: ::c_int = 3;
    pub const PTRACE_EVENT_EXEC: ::c_int = 4;
    pub const PTRACE_EVENT_VFORK_DONE: ::c_int = 5;
    pub const PTRACE_EVENT_EXIT: ::c_int = 6;
    pub const PTRACE_EVENT_SECCOMP: ::c_int = 7;
    // PTRACE_EVENT_STOP was added to glibc in 2.26
    // pub const PTRACE_EVENT_STOP: ::c_int = 128;

    pub const __WNOTHREAD: ::c_int = 0x20000000;
    pub const __WALL: ::c_int = 0x40000000;
    pub const __WCLONE: ::c_int = 0x80000000;

    pub const SPLICE_F_MOVE: ::c_uint = 0x01;
    pub const SPLICE_F_NONBLOCK: ::c_uint = 0x02;
    pub const SPLICE_F_MORE: ::c_uint = 0x04;
    pub const SPLICE_F_GIFT: ::c_uint = 0x08;

    pub const RTLD_LOCAL: ::c_int = 0;
    pub const RTLD_LAZY: ::c_int = 1;

    pub const POSIX_FADV_NORMAL: ::c_int = 0;
    pub const POSIX_FADV_RANDOM: ::c_int = 1;
    pub const POSIX_FADV_SEQUENTIAL: ::c_int = 2;
    pub const POSIX_FADV_WILLNEED: ::c_int = 3;

    pub const AT_FDCWD: ::c_int = -100;
    pub const AT_SYMLINK_NOFOLLOW: ::c_int = 0x100;
    pub const AT_REMOVEDIR: ::c_int = 0x200;
    pub const AT_SYMLINK_FOLLOW: ::c_int = 0x400;
    pub const AT_NO_AUTOMOUNT: ::c_int = 0x800;
    pub const AT_EMPTY_PATH: ::c_int = 0x1000;

    pub const LOG_CRON: ::c_int = 9 << 3;
    pub const LOG_AUTHPRIV: ::c_int = 10 << 3;
    pub const LOG_FTP: ::c_int = 11 << 3;
    pub const LOG_PERROR: ::c_int = 0x20;

    pub const PIPE_BUF: usize = 4096;

    pub const SI_LOAD_SHIFT: ::c_uint = 16;

    pub const SIGEV_SIGNAL: ::c_int = 0;
    pub const SIGEV_NONE: ::c_int = 1;
    pub const SIGEV_THREAD: ::c_int = 2;

    pub const P_ALL: idtype_t = 0;
    pub const P_PID: idtype_t = 1;
    pub const P_PGID: idtype_t = 2;

    pub const UTIME_OMIT: c_long = 1073741822;
    pub const UTIME_NOW: c_long = 1073741823;

    pub const POLLIN: ::c_short = 0x1;
    pub const POLLPRI: ::c_short = 0x2;
    pub const POLLOUT: ::c_short = 0x4;
    pub const POLLERR: ::c_short = 0x8;
    pub const POLLHUP: ::c_short = 0x10;
    pub const POLLNVAL: ::c_short = 0x20;
    pub const POLLRDNORM: ::c_short = 0x040;
    pub const POLLRDBAND: ::c_short = 0x080;

    pub const IPTOS_LOWDELAY: u8 = 0x10;
    pub const IPTOS_THROUGHPUT: u8 = 0x08;
    pub const IPTOS_RELIABILITY: u8 = 0x04;
    pub const IPTOS_MINCOST: u8 = 0x02;

    pub const IPTOS_PREC_NETCONTROL: u8 = 0xe0;
    pub const IPTOS_PREC_INTERNETCONTROL: u8 = 0xc0;
    pub const IPTOS_PREC_CRITIC_ECP: u8 = 0xa0;
    pub const IPTOS_PREC_FLASHOVERRIDE: u8 = 0x80;
    pub const IPTOS_PREC_FLASH: u8 = 0x60;
    pub const IPTOS_PREC_IMMEDIATE: u8 = 0x40;
    pub const IPTOS_PREC_PRIORITY: u8 = 0x20;
    pub const IPTOS_PREC_ROUTINE: u8 = 0x00;

    pub const IPTOS_ECN_MASK: u8 = 0x03;
    pub const IPTOS_ECN_ECT1: u8 = 0x01;
    pub const IPTOS_ECN_ECT0: u8 = 0x02;
    pub const IPTOS_ECN_CE: u8 = 0x03;

    pub const IPOPT_COPY: u8 = 0x80;
    pub const IPOPT_CLASS_MASK: u8 = 0x60;
    pub const IPOPT_NUMBER_MASK: u8 = 0x1f;

    pub const IPOPT_CONTROL: u8 = 0x00;
    pub const IPOPT_RESERVED1: u8 = 0x20;
    pub const IPOPT_MEASUREMENT: u8 = 0x40;
    pub const IPOPT_RESERVED2: u8 = 0x60;
    pub const IPOPT_END: u8 = (0 |IPOPT_CONTROL);
    pub const IPOPT_NOOP: u8 = (1 |IPOPT_CONTROL);
    pub const IPOPT_SEC: u8 = (2 |IPOPT_CONTROL|IPOPT_COPY);
    pub const IPOPT_LSRR: u8 = (3 |IPOPT_CONTROL|IPOPT_COPY);
    pub const IPOPT_TIMESTAMP: u8 = (4 |IPOPT_MEASUREMENT);
    pub const IPOPT_RR: u8 = (7 |IPOPT_CONTROL);
    pub const IPOPT_SID: u8 = (8 |IPOPT_CONTROL|IPOPT_COPY);
    pub const IPOPT_SSRR: u8 = (9 |IPOPT_CONTROL|IPOPT_COPY);
    pub const IPOPT_RA: u8 = (20|IPOPT_CONTROL|IPOPT_COPY);
    pub const IPVERSION: u8 = 4;
    pub const MAXTTL: u8 = 255;
    pub const IPDEFTTL: u8 = 64;
    pub const IPOPT_OPTVAL: u8 = 0;
    pub const IPOPT_OLEN: u8 = 1;
    pub const IPOPT_OFFSET: u8 = 2;
    pub const IPOPT_MINOFF: u8 = 4;
    pub const MAX_IPOPTLEN: u8 = 40;
    pub const IPOPT_NOP: u8 = IPOPT_NOOP;
    pub const IPOPT_EOL: u8 = IPOPT_END;
    pub const IPOPT_TS: u8 = IPOPT_TIMESTAMP;
    pub const IPOPT_TS_TSONLY: u8 = 0;
    pub const IPOPT_TS_TSANDADDR: u8 = 1;
    pub const IPOPT_TS_PRESPEC: u8 = 3;

    pub const ARPOP_RREQUEST: u16 = 3;
    pub const ARPOP_RREPLY: u16 = 4;
    pub const ARPOP_InREQUEST: u16 = 8;
    pub const ARPOP_InREPLY: u16 = 9;
    pub const ARPOP_NAK: u16 = 10;

    pub const ATF_NETMASK: ::c_int = 0x20;
    pub const ATF_DONTPUB: ::c_int = 0x40;

    pub const ARPHRD_NETROM: u16 = 0;
    pub const ARPHRD_ETHER: u16 = 1;
    pub const ARPHRD_EETHER: u16 = 2;
    pub const ARPHRD_AX25: u16 = 3;
    pub const ARPHRD_PRONET: u16 = 4;
    pub const ARPHRD_CHAOS: u16 = 5;
    pub const ARPHRD_IEEE802: u16 = 6;
    pub const ARPHRD_ARCNET: u16 = 7;
    pub const ARPHRD_APPLETLK: u16 = 8;
    pub const ARPHRD_DLCI: u16 = 15;
    pub const ARPHRD_ATM: u16 = 19;
    pub const ARPHRD_METRICOM: u16 = 23;
    pub const ARPHRD_IEEE1394: u16 = 24;
    pub const ARPHRD_EUI64: u16 = 27;
    pub const ARPHRD_INFINIBAND: u16 = 32;

    pub const ARPHRD_SLIP: u16 = 256;
    pub const ARPHRD_CSLIP: u16 = 257;
    pub const ARPHRD_SLIP6: u16 = 258;
    pub const ARPHRD_CSLIP6: u16 = 259;
    pub const ARPHRD_RSRVD: u16 = 260;
    pub const ARPHRD_ADAPT: u16 = 264;
    pub const ARPHRD_ROSE: u16 = 270;
    pub const ARPHRD_X25: u16 = 271;
    pub const ARPHRD_HWX25: u16 = 272;
    pub const ARPHRD_PPP: u16 = 512;
    pub const ARPHRD_CISCO: u16 = 513;
    pub const ARPHRD_HDLC: u16 = ARPHRD_CISCO;
    pub const ARPHRD_LAPB: u16 = 516;
    pub const ARPHRD_DDCMP: u16 = 517;
    pub const ARPHRD_RAWHDLC: u16 = 518;

    pub const ARPHRD_TUNNEL: u16 = 768;
    pub const ARPHRD_TUNNEL6: u16 = 769;
    pub const ARPHRD_FRAD: u16 = 770;
    pub const ARPHRD_SKIP: u16 = 771;
    pub const ARPHRD_LOOPBACK: u16 = 772;
    pub const ARPHRD_LOCALTLK: u16 = 773;
    pub const ARPHRD_FDDI: u16 = 774;
    pub const ARPHRD_BIF: u16 = 775;
    pub const ARPHRD_SIT: u16 = 776;
    pub const ARPHRD_IPDDP: u16 = 777;
    pub const ARPHRD_IPGRE: u16 = 778;
    pub const ARPHRD_PIMREG: u16 = 779;
    pub const ARPHRD_HIPPI: u16 = 780;
    pub const ARPHRD_ASH: u16 = 781;
    pub const ARPHRD_ECONET: u16 = 782;
    pub const ARPHRD_IRDA: u16 = 783;
    pub const ARPHRD_FCPP: u16 = 784;
    pub const ARPHRD_FCAL: u16 = 785;
    pub const ARPHRD_FCPL: u16 = 786;
    pub const ARPHRD_FCFABRIC: u16 = 787;
    pub const ARPHRD_IEEE802_TR: u16 = 800;
    pub const ARPHRD_IEEE80211: u16 = 801;
    pub const ARPHRD_IEEE80211_PRISM: u16 = 802;
    pub const ARPHRD_IEEE80211_RADIOTAP: u16 = 803;
    pub const ARPHRD_IEEE802154: u16 = 804;

    pub const ARPHRD_VOID: u16 = 0xFFFF;
    pub const ARPHRD_NONE: u16 = 0xFFFE;

    fn CMSG_ALIGN(len: usize) -> usize {
        len + ::mem::size_of::<usize>() - 1 & !(::mem::size_of::<usize>() - 1)
    }

    f! {
        pub fn CMSG_FIRSTHDR(mhdr: *const msghdr) -> *mut cmsghdr {
            if (*mhdr).msg_controllen as usize >= ::mem::size_of::<cmsghdr>() {
                (*mhdr).msg_control as *mut cmsghdr
            } else {
                0 as *mut cmsghdr
            }
        }

        pub fn CMSG_DATA(cmsg: *const cmsghdr) -> *mut ::c_uchar {
            cmsg.offset(1) as *mut ::c_uchar
        }

        pub fn CMSG_SPACE(length: ::c_uint) -> ::c_uint {
            (CMSG_ALIGN(length as usize) + CMSG_ALIGN(::mem::size_of::<cmsghdr>()))
                as ::c_uint
        }

        pub fn CMSG_LEN(length: ::c_uint) -> ::c_uint {
            CMSG_ALIGN(::mem::size_of::<cmsghdr>()) as ::c_uint + length
        }

        pub fn FD_CLR(fd: ::c_int, set: *mut fd_set) -> () {
            let fd = fd as usize;
            let size = ::mem::size_of_val(&(*set).fds_bits[0]) * 8;
            (*set).fds_bits[fd / size] &= !(1 << (fd % size));
            return
        }

        pub fn FD_ISSET(fd: ::c_int, set: *mut fd_set) -> bool {
            let fd = fd as usize;
            let size = ::mem::size_of_val(&(*set).fds_bits[0]) * 8;
            return ((*set).fds_bits[fd / size] & (1 << (fd % size))) != 0
        }

        pub fn FD_SET(fd: ::c_int, set: *mut fd_set) -> () {
            let fd = fd as usize;
            let size = ::mem::size_of_val(&(*set).fds_bits[0]) * 8;
            (*set).fds_bits[fd / size] |= 1 << (fd % size);
            return
        }

        pub fn FD_ZERO(set: *mut fd_set) -> () {
            for slot in (*set).fds_bits.iter_mut() {
                *slot = 0;
            }
        }

        pub fn WIFSTOPPED(status: ::c_int) -> bool {
            (status & 0xff) == 0x7f
        }

        pub fn WSTOPSIG(status: ::c_int) -> ::c_int {
            (status >> 8) & 0xff
        }

        pub fn WIFCONTINUED(status: ::c_int) -> bool {
            status == 0xffff
        }

        pub fn WIFSIGNALED(status: ::c_int) -> bool {
            ((status & 0x7f) + 1) as i8 >= 2
        }

        pub fn WTERMSIG(status: ::c_int) -> ::c_int {
            status & 0x7f
        }

        pub fn WIFEXITED(status: ::c_int) -> bool {
            (status & 0x7f) == 0
        }

        pub fn WEXITSTATUS(status: ::c_int) -> ::c_int {
            (status >> 8) & 0xff
        }

        pub fn WCOREDUMP(status: ::c_int) -> bool {
            (status & 0x80) != 0
        }

        pub fn QCMD(cmd: ::c_int, type_: ::c_int) -> ::c_int {
            (cmd << 8) | (type_ & 0x00ff)
        }

        pub fn IPOPT_COPIED(o: u8) -> u8 {
            o & IPOPT_COPY
        }

        pub fn IPOPT_CLASS(o: u8) -> u8 {
            o & IPOPT_CLASS_MASK
        }

        pub fn IPOPT_NUMBER(o: u8) -> u8 {
            o & IPOPT_NUMBER_MASK
        }

        pub fn IPTOS_ECN(x: u8) -> u8 {
            x & ::IPTOS_ECN_MASK
        }
    }

    extern {
        pub fn sem_destroy(sem: *mut sem_t) -> ::c_int;
        pub fn sem_init(sem: *mut sem_t,
                        pshared: ::c_int,
                        value: ::c_uint)
                        -> ::c_int;
        pub fn fdatasync(fd: ::c_int) -> ::c_int;
        pub fn mincore(addr: *mut ::c_void, len: ::size_t,
                       vec: *mut ::c_uchar) -> ::c_int;
        pub fn clock_getres(clk_id: ::clockid_t, tp: *mut ::timespec) -> ::c_int;
        pub fn clock_gettime(clk_id: ::clockid_t, tp: *mut ::timespec) -> ::c_int;
        pub fn clock_settime(clk_id: ::clockid_t, tp: *const ::timespec) -> ::c_int;
        pub fn dirfd(dirp: *mut ::DIR) -> ::c_int;

        pub fn pthread_getattr_np(native: ::pthread_t,
                                  attr: *mut ::pthread_attr_t) -> ::c_int;
        pub fn pthread_attr_getstack(attr: *const ::pthread_attr_t,
                                     stackaddr: *mut *mut ::c_void,
                                     stacksize: *mut ::size_t) -> ::c_int;
        pub fn memalign(align: ::size_t, size: ::size_t) -> *mut ::c_void;
        pub fn setgroups(ngroups: ::size_t,
                         ptr: *const ::gid_t) -> ::c_int;
        pub fn pipe2(fds: *mut ::c_int, flags: ::c_int) -> ::c_int;
        pub fn statfs(path: *const ::c_char, buf: *mut statfs) -> ::c_int;
        pub fn statfs64(path: *const ::c_char, buf: *mut statfs64) -> ::c_int;
        pub fn fstatfs(fd: ::c_int, buf: *mut statfs) -> ::c_int;
        pub fn fstatfs64(fd: ::c_int, buf: *mut statfs64) -> ::c_int;
        pub fn statvfs64(path: *const ::c_char, buf: *mut statvfs64) -> ::c_int;
        pub fn fstatvfs64(fd: ::c_int, buf: *mut statvfs64) -> ::c_int;
        pub fn memrchr(cx: *const ::c_void,
                       c: ::c_int,
                       n: ::size_t) -> *mut ::c_void;

        pub fn posix_fadvise(fd: ::c_int, offset: ::off_t, len: ::off_t,
                             advise: ::c_int) -> ::c_int;
        pub fn futimens(fd: ::c_int, times: *const ::timespec) -> ::c_int;
        pub fn utimensat(dirfd: ::c_int, path: *const ::c_char,
                         times: *const ::timespec, flag: ::c_int) -> ::c_int;
        pub fn duplocale(base: ::locale_t) -> ::locale_t;
        pub fn freelocale(loc: ::locale_t);
        pub fn newlocale(mask: ::c_int,
                         locale: *const ::c_char,
                         base: ::locale_t) -> ::locale_t;
        pub fn uselocale(loc: ::locale_t) -> ::locale_t;
        pub fn creat64(path: *const c_char, mode: mode_t) -> ::c_int;
        pub fn fstat64(fildes: ::c_int, buf: *mut stat64) -> ::c_int;
        pub fn fstatat64(dirfd: ::c_int, pathname: *const c_char,
                         buf: *mut stat64, flags: ::c_int) -> ::c_int;
        pub fn ftruncate64(fd: ::c_int, length: off64_t) -> ::c_int;
        pub fn lseek64(fd: ::c_int, offset: off64_t, whence: ::c_int) -> off64_t;
        pub fn lstat64(path: *const c_char, buf: *mut stat64) -> ::c_int;
        pub fn mmap64(addr: *mut ::c_void,
                      len: ::size_t,
                      prot: ::c_int,
                      flags: ::c_int,
                      fd: ::c_int,
                      offset: off64_t)
                      -> *mut ::c_void;
        pub fn open64(path: *const c_char, oflag: ::c_int, ...) -> ::c_int;
        pub fn openat64(fd: ::c_int,
                        path: *const c_char,
                        oflag: ::c_int, ...) -> ::c_int;
        pub fn pread64(fd: ::c_int, buf: *mut ::c_void, count: ::size_t,
                       offset: off64_t) -> ::ssize_t;
        pub fn preadv64(fd: ::c_int,
                        iov: *const ::iovec,
                        iovcnt: ::c_int,
                        offset: ::off64_t) -> ::ssize_t;
        pub fn pwrite64(fd: ::c_int, buf: *const ::c_void, count: ::size_t,
                        offset: off64_t) -> ::ssize_t;
        pub fn pwritev64(fd: ::c_int,
                         iov: *const ::iovec,
                         iovcnt: ::c_int,
                         offset: ::off64_t) -> ::ssize_t;
        pub fn readdir64(dirp: *mut ::DIR) -> *mut ::dirent64;
        pub fn readdir64_r(dirp: *mut ::DIR, entry: *mut ::dirent64,
                           result: *mut *mut ::dirent64) -> ::c_int;
        pub fn stat64(path: *const c_char, buf: *mut stat64) -> ::c_int;
        pub fn truncate64(path: *const c_char, length: off64_t) -> ::c_int;

        pub fn mknodat(dirfd: ::c_int, pathname: *const ::c_char,
                       mode: ::mode_t, dev: dev_t) -> ::c_int;
        pub fn pthread_condattr_getclock(attr: *const pthread_condattr_t,
                                         clock_id: *mut clockid_t) -> ::c_int;
        pub fn pthread_condattr_setclock(attr: *mut pthread_condattr_t,
                                         clock_id: ::clockid_t) -> ::c_int;
        pub fn pthread_condattr_setpshared(attr: *mut pthread_condattr_t,
                                           pshared: ::c_int) -> ::c_int;
        pub fn accept4(fd: ::c_int, addr: *mut ::sockaddr, len: *mut ::socklen_t,
                       flg: ::c_int) -> ::c_int;
        pub fn pthread_mutexattr_setpshared(attr: *mut pthread_mutexattr_t,
                                            pshared: ::c_int) -> ::c_int;
        pub fn pthread_rwlockattr_getpshared(attr: *const pthread_rwlockattr_t,
                                             val: *mut ::c_int) -> ::c_int;
        pub fn pthread_rwlockattr_setpshared(attr: *mut pthread_rwlockattr_t,
                                             val: ::c_int) -> ::c_int;
        pub fn ptsname_r(fd: ::c_int,
                         buf: *mut ::c_char,
                         buflen: ::size_t) -> ::c_int;
        pub fn clearenv() -> ::c_int;
        pub fn waitid(idtype: idtype_t, id: id_t, infop: *mut ::siginfo_t,
                      options: ::c_int) -> ::c_int;
        pub fn setreuid(ruid: ::uid_t, euid: ::uid_t) -> ::c_int;
        pub fn setregid(rgid: ::gid_t, egid: ::gid_t) -> ::c_int;
        pub fn getresuid(ruid: *mut ::uid_t, euid: *mut ::uid_t,
                         suid: *mut ::uid_t) -> ::c_int;
        pub fn getresgid(rgid: *mut ::gid_t, egid: *mut ::gid_t,
                         sgid: *mut ::gid_t) -> ::c_int;
        pub fn acct(filename: *const ::c_char) -> ::c_int;
        pub fn brk(addr: *mut ::c_void) -> ::c_int;
        pub fn sbrk(increment: ::intptr_t) -> *mut ::c_void;
        pub fn vfork() -> ::pid_t;
        pub fn setresgid(rgid: ::gid_t, egid: ::gid_t, sgid: ::gid_t) -> ::c_int;
        pub fn setresuid(ruid: ::uid_t, euid: ::uid_t, suid: ::uid_t) -> ::c_int;
        pub fn wait4(pid: ::pid_t, status: *mut ::c_int, options: ::c_int,
                     rusage: *mut ::rusage) -> ::pid_t;
        pub fn openpty(amaster: *mut ::c_int,
                    aslave: *mut ::c_int,
                    name: *mut ::c_char,
                    termp: *const termios,
                    winp: *const ::winsize) -> ::c_int;
        pub fn forkpty(amaster: *mut ::c_int,
                    name: *mut ::c_char,
                    termp: *const termios,
                    winp: *const ::winsize) -> ::pid_t;
        pub fn login_tty(fd: ::c_int) -> ::c_int;
        pub fn execvpe(file: *const ::c_char, argv: *const *const ::c_char,
                       envp: *const *const ::c_char) -> ::c_int;
        pub fn fexecve(fd: ::c_int, argv: *const *const ::c_char,
                       envp: *const *const ::c_char)
                       -> ::c_int;
        pub fn getifaddrs(ifap: *mut *mut ::ifaddrs) -> ::c_int;
        pub fn freeifaddrs(ifa: *mut ::ifaddrs);
        pub fn bind(socket: ::c_int, address: *const ::sockaddr,
                    address_len: ::socklen_t) -> ::c_int;

        pub fn writev(fd: ::c_int,
                      iov: *const ::iovec,
                      iovcnt: ::c_int) -> ::ssize_t;
        pub fn readv(fd: ::c_int,
                     iov: *const ::iovec,
                     iovcnt: ::c_int) -> ::ssize_t;

        pub fn sendmsg(fd: ::c_int,
                       msg: *const ::msghdr,
                       flags: ::c_int) -> ::ssize_t;
        pub fn recvmsg(fd: ::c_int, msg: *mut ::msghdr, flags: ::c_int)
                       -> ::ssize_t;
        pub fn uname(buf: *mut ::utsname) -> ::c_int;
    }

    cfg_if! {
        if #[cfg(target_os = "emscripten")] {
            mod emscripten;
            pub use self::emscripten::*;
        } else if #[cfg(target_os = "linux")] {
            mod linux;
            pub use self::linux::*;
        } else if #[cfg(target_os = "android")] {
            mod android;
            pub use self::android::*;
        } else {
            // Unknown target_os
        }
    }

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