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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 fsblkcnt_t = ::c_uint;
pub type fsfilcnt_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_in {
        pub sin_len: u8,
        pub sin_family: sa_family_t,
        pub sin_port: ::in_port_t,
        pub sin_addr: ::in_addr,
        pub sin_zero: [::c_char; 8],
    }

    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")))]
        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 {
        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 const FIOCLEX: ::c_ulong = 0x20006601;
pub const FIONBIO: ::c_ulong = 0x8004667e;

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 SIGCHLD: ::c_int = 20;
pub const SIGBUS: ::c_int = 10;
pub const SIG_SETMASK: ::c_int = 3;

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

pub const FD_SETSIZE: usize = 1024;

pub const ST_RDONLY: ::c_ulong = 1;
pub const ST_NOSUID: ::c_ulong = 2;

pub const NI_MAXHOST: ::socklen_t = 1025;

f! {
    pub fn FD_CLR(fd: ::c_int, set: *mut fd_set) -> () {
        let fd = fd as usize;
        (*set).fds_bits[fd / 32] &= !(1 << (fd % 32));
        return
    }

    pub fn FD_ISSET(fd: ::c_int, set: *mut fd_set) -> bool {
        let fd = fd as usize;
        return ((*set).fds_bits[fd / 32] & (1 << (fd % 32))) != 0
    }

    pub fn FD_SET(fd: ::c_int, set: *mut fd_set) -> () {
        let fd = fd as usize;
        (*set).fds_bits[fd / 32] |= 1 << (fd % 32);
        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 mincore(addr: *const ::c_void, len: ::size_t,
                   vec: *mut c_char) -> ::c_int;
    pub fn sysctlnametomib(name: *const c_char,
                           mibp: *mut ::c_int,
                           sizep: *mut ::size_t)
                           -> ::c_int;
    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 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;
}

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 {
        // ...
    }
}