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    use dox::mem;

    pub type c_char = i8;
    pub type wchar_t = i32;
    pub type off_t = i64;
    pub type useconds_t = u32;
    pub type blkcnt_t = i64;
    pub type socklen_t = u32;
    pub type sa_family_t = u8;
    pub type pthread_t = ::uintptr_t;
    pub type nfds_t = ::c_uint;

    s! {
        pub struct sockaddr {
            pub sa_len: u8,
            pub sa_family: sa_family_t,
            pub sa_data: [::c_char; 14],
        }

        pub struct sockaddr_in6 {
            pub sin6_len: u8,
            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 sockaddr_un {
            pub sun_len: u8,
            pub sun_family: sa_family_t,
            pub sun_path: [c_char; 104]
        }

        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_change: ::time_t,
            pub pw_class: *mut ::c_char,
            pub pw_gecos: *mut ::c_char,
            pub pw_dir: *mut ::c_char,
            pub pw_shell: *mut ::c_char,
            pub pw_expire: ::time_t,

            #[cfg(not(any(target_os = "macos",
                          target_os = "ios",
                          target_os = "netbsd",
                          target_os = "openbsd")))]
            pub pw_fields: ::c_int,
        }

        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_dstaddr: *mut ::sockaddr,
            pub ifa_data: *mut ::c_void
        }

        pub struct fd_set {
            #[cfg(all(target_pointer_width = "64",
                      any(target_os = "freebsd", target_os = "dragonfly")))]
            fds_bits: [i64; FD_SETSIZE / 64],
            #[cfg(not(all(target_pointer_width = "64",
                          any(target_os = "freebsd", target_os = "dragonfly"))))]
            fds_bits: [i32; FD_SETSIZE / 32],
        }

        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: *mut ::c_char,
        }

        pub struct utsname {
            #[cfg(not(target_os = "dragonfly"))]
            pub sysname: [::c_char; 256],
            #[cfg(target_os = "dragonfly")]
            pub sysname: [::c_char; 32],
            #[cfg(not(target_os = "dragonfly"))]
            pub nodename: [::c_char; 256],
            #[cfg(target_os = "dragonfly")]
            pub nodename: [::c_char; 32],
            #[cfg(not(target_os = "dragonfly"))]
            pub release: [::c_char; 256],
            #[cfg(target_os = "dragonfly")]
            pub release: [::c_char; 32],
            #[cfg(not(target_os = "dragonfly"))]
            pub version: [::c_char; 256],
            #[cfg(target_os = "dragonfly")]
            pub version: [::c_char; 32],
            #[cfg(not(target_os = "dragonfly"))]
            pub machine: [::c_char; 256],
            #[cfg(target_os = "dragonfly")]
            pub machine: [::c_char; 32],
        }

        pub struct msghdr {
            pub msg_name: *mut ::c_void,
            pub msg_namelen: ::socklen_t,
            pub msg_iov: *mut ::iovec,
            pub msg_iovlen: ::c_int,
            pub msg_control: *mut ::c_void,
            pub msg_controllen: ::socklen_t,
            pub msg_flags: ::c_int,
        }

        pub struct fsid_t {
            __fsid_val: [::int32_t; 2],
        }
    }

    pub const FIOCLEX: ::c_ulong = 0x20006601;
    pub const FIONBIO: ::c_ulong = 0x8004667e;

    pub const PATH_MAX: ::c_int = 1024;

    pub const SA_ONSTACK: ::c_int = 0x0001;
    pub const SA_SIGINFO: ::c_int = 0x0040;
    pub const SA_RESTART: ::c_int = 0x0002;
    pub const SA_RESETHAND: ::c_int = 0x0004;
    pub const SA_NOCLDSTOP: ::c_int = 0x0008;
    pub const SA_NODEFER: ::c_int = 0x0010;
    pub const SA_NOCLDWAIT: ::c_int = 0x0020;

    pub const SS_ONSTACK: ::c_int = 1;
    pub const SS_DISABLE: ::c_int = 4;

    pub const SIGCHLD: ::c_int = 20;
    pub const SIGBUS: ::c_int = 10;
    pub const SIGUSR1: ::c_int = 30;
    pub const SIGUSR2: ::c_int = 31;
    pub const SIGCONT: ::c_int = 19;
    pub const SIGSTOP: ::c_int = 17;
    pub const SIGTSTP: ::c_int = 18;
    pub const SIGURG: ::c_int = 16;
    pub const SIGIO: ::c_int = 23;
    pub const SIGSYS: ::c_int = 12;
    pub const SIGTTIN: ::c_int = 21;
    pub const SIGTTOU: ::c_int = 22;
    pub const SIGXCPU: ::c_int = 24;
    pub const SIGXFSZ: ::c_int = 25;
    pub const SIGVTALRM: ::c_int = 26;
    pub const SIGPROF: ::c_int = 27;
    pub const SIGWINCH: ::c_int = 28;

    pub const SIG_SETMASK: ::c_int = 3;
    pub const SIG_BLOCK: ::c_int = 0x1;
    pub const SIG_UNBLOCK: ::c_int = 0x2;

    pub const IPV6_MULTICAST_LOOP: ::c_int = 11;
    pub const IPV6_V6ONLY: ::c_int = 27;

    pub const ST_RDONLY: ::c_ulong = 1;

    pub const CTL_HW: ::c_int = 6;
    pub const HW_NCPU: ::c_int = 3;

    pub const EV_ADD: ::uint16_t = 0x1;
    pub const EV_CLEAR: ::uint16_t = 0x20;
    pub const EV_DELETE: ::uint16_t = 0x2;
    pub const EV_DISABLE: ::uint16_t = 0x8;
    pub const EV_ENABLE: ::uint16_t = 0x4;
    pub const EV_EOF: ::uint16_t = 0x8000;
    pub const EV_ERROR: ::uint16_t = 0x4000;
    pub const EV_FLAG1: ::uint16_t = 0x2000;
    pub const EV_ONESHOT: ::uint16_t = 0x10;
    pub const EV_SYSFLAGS: ::uint16_t = 0xf000;

    pub const NOTE_ATTRIB: ::uint32_t = 0x8;
    pub const NOTE_CHILD: ::uint32_t = 0x4;
    pub const NOTE_DELETE: ::uint32_t = 0x1;
    pub const NOTE_EXEC: ::uint32_t = 0x20000000;
    pub const NOTE_EXIT: ::uint32_t = 0x80000000;
    pub const NOTE_EXTEND: ::uint32_t = 0x4;
    pub const NOTE_FORK: ::uint32_t = 0x40000000;
    pub const NOTE_LINK: ::uint32_t = 0x10;
    pub const NOTE_LOWAT: ::uint32_t = 0x1;
    pub const NOTE_PDATAMASK: ::uint32_t = 0x000fffff;
    pub const NOTE_RENAME: ::uint32_t = 0x20;
    pub const NOTE_REVOKE: ::uint32_t = 0x40;
    pub const NOTE_TRACK: ::uint32_t = 0x1;
    pub const NOTE_TRACKERR: ::uint32_t = 0x2;
    pub const NOTE_WRITE: ::uint32_t = 0x2;

    pub const NCCS: usize = 20;

    pub const O_ASYNC: ::c_int = 0x40;
    pub const O_FSYNC: ::c_int = 0x80;
    pub const O_NDELAY: ::c_int = 0x4;
    pub const O_NOFOLLOW: ::c_int = 0x100;

    pub const F_GETOWN: ::c_int = 5;
    pub const F_SETOWN: ::c_int = 6;

    pub const MNT_FORCE: ::c_int = 0x80000;

    pub const Q_SYNC: ::c_int = 0x600;
    pub const Q_QUOTAON: ::c_int = 0x100;
    pub const Q_QUOTAOFF: ::c_int = 0x200;

    pub const TCIOFF: ::c_int = 3;
    pub const TCION: ::c_int = 4;
    pub const TCOOFF: ::c_int = 1;
    pub const TCOON: ::c_int = 2;
    pub const TCIFLUSH: ::c_int = 1;
    pub const TCOFLUSH: ::c_int = 2;
    pub const TCIOFLUSH: ::c_int = 3;
    pub const TCSANOW: ::c_int = 0;
    pub const TCSADRAIN: ::c_int = 1;
    pub const TCSAFLUSH: ::c_int = 2;
    pub const VEOF: usize = 0;
    pub const VEOL: usize = 1;
    pub const VEOL2: usize = 2;
    pub const VERASE: usize = 3;
    pub const VWERASE: usize = 4;
    pub const VKILL: usize = 5;
    pub const VREPRINT: usize = 6;
    pub const VINTR: usize = 8;
    pub const VQUIT: usize = 9;
    pub const VSUSP: usize = 10;
    pub const VSTART: usize = 12;
    pub const VSTOP: usize = 13;
    pub const VLNEXT: usize = 14;
    pub const VDISCARD: usize = 15;
    pub const VMIN: usize = 16;
    pub const VTIME: usize = 17;
    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 IXON: ::tcflag_t = 0x00000200;
    pub const IXOFF: ::tcflag_t = 0x00000400;
    pub const IXANY: ::tcflag_t = 0x00000800;
    pub const IMAXBEL: ::tcflag_t = 0x00002000;
    pub const OPOST: ::tcflag_t = 0x1;
    pub const ONLCR: ::tcflag_t = 0x2;
    pub const CSIZE: ::tcflag_t = 0x00000300;
    pub const CS5: ::tcflag_t = 0x00000000;
    pub const CS6: ::tcflag_t = 0x00000100;
    pub const CS7: ::tcflag_t = 0x00000200;
    pub const CS8: ::tcflag_t = 0x00000300;
    pub const CSTOPB: ::tcflag_t = 0x00000400;
    pub const CREAD: ::tcflag_t = 0x00000800;
    pub const PARENB: ::tcflag_t = 0x00001000;
    pub const PARODD: ::tcflag_t = 0x00002000;
    pub const HUPCL: ::tcflag_t = 0x00004000;
    pub const CLOCAL: ::tcflag_t = 0x00008000;
    pub const ECHOKE: ::tcflag_t = 0x00000001;
    pub const ECHOE: ::tcflag_t = 0x00000002;
    pub const ECHOK: ::tcflag_t = 0x00000004;
    pub const ECHO: ::tcflag_t = 0x00000008;
    pub const ECHONL: ::tcflag_t = 0x00000010;
    pub const ECHOPRT: ::tcflag_t = 0x00000020;
    pub const ECHOCTL: ::tcflag_t = 0x00000040;
    pub const ISIG: ::tcflag_t = 0x00000080;
    pub const ICANON: ::tcflag_t = 0x00000100;
    pub const IEXTEN: ::tcflag_t = 0x00000400;
    pub const EXTPROC: ::tcflag_t = 0x00000800;
    pub const TOSTOP: ::tcflag_t = 0x00400000;
    pub const FLUSHO: ::tcflag_t = 0x00800000;
    pub const PENDIN: ::tcflag_t = 0x20000000;
    pub const NOFLSH: ::tcflag_t = 0x80000000;

    pub const WNOHANG: ::c_int = 1;

    pub const RTLD_NOW: ::c_int = 0x2;

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

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

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

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

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

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

        pub fn WTERMSIG(status: ::c_int) -> ::c_int {
            status & 0o177
        }
    }

    extern {
        pub fn setgroups(ngroups: ::c_int,
                         ptr: *const ::gid_t) -> ::c_int;
        pub fn ioctl(fd: ::c_int, request: ::c_ulong, ...) -> ::c_int;
        pub fn kqueue() -> ::c_int;
        pub fn unmount(target: *const ::c_char, arg: ::c_int) -> ::c_int;
        pub fn syscall(num: ::c_int, ...) -> ::c_int;
        #[cfg_attr(target_os = "netbsd", link_name = "__getpwuid_r50")]
        pub fn getpwuid_r(uid: ::uid_t,
                          pwd: *mut passwd,
                          buf: *mut ::c_char,
                          buflen: ::size_t,
                          result: *mut *mut passwd) -> ::c_int;
    }

    cfg_if! {
        if #[cfg(any(target_os = "macos", target_os = "ios"))] {
            mod apple;
            pub use self::apple::*;
        } else if #[cfg(any(target_os = "openbsd", target_os = "netbsd",
                            target_os = "bitrig"))] {
            mod openbsdlike;
            pub use self::openbsdlike::*;
        } else if #[cfg(any(target_os = "freebsd", target_os = "dragonfly"))] {
            mod freebsdlike;
            pub use self::freebsdlike::*;
        } else {
            // ...
        }
    }

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