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    use libc;
    use std::os::unix::io::RawFd;
    use Result;
    use errno::Errno;

    libc_bitflags! {
        pub struct EfdFlags: libc::c_int {
            EFD_CLOEXEC; // Since Linux 2.6.27
            EFD_NONBLOCK; // Since Linux 2.6.27
            EFD_SEMAPHORE; // Since Linux 2.6.30
        }
    }

    pub fn eventfd(initval: libc::c_uint, flags: EfdFlags) -> Result<RawFd> {
        let res = unsafe { libc::eventfd(initval, flags.bits()) };

        Errno::result(res).map(|r| r as RawFd)
    }

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