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    //! Definitions found commonly among almost all Unix derivatives
    //!
    //! More functions and definitions can be found in the more specific modules
    //! according to the platform in question.

    pub type pid_t = i32;
    pub type uid_t = u32;
    pub type gid_t = u32;
    pub type in_addr_t = u32;
    pub type in_port_t = u16;
    pub type sighandler_t = ::size_t;
    pub type cc_t = ::c_uchar;

    pub enum DIR {}

    s! {
        pub struct utimbuf {
            pub actime: time_t,
            pub modtime: time_t,
        }

        pub struct timeval {
            pub tv_sec: time_t,
            pub tv_usec: suseconds_t,
        }

        pub struct timespec {
            pub tv_sec: time_t,
            pub tv_nsec: c_long,
        }

        pub struct rlimit {
            pub rlim_cur: rlim_t,
            pub rlim_max: rlim_t,
        }

        pub struct rusage {
            pub ru_utime: timeval,
            pub ru_stime: timeval,
            pub ru_maxrss: c_long,
            pub ru_ixrss: c_long,
            pub ru_idrss: c_long,
            pub ru_isrss: c_long,
            pub ru_minflt: c_long,
            pub ru_majflt: c_long,
            pub ru_nswap: c_long,
            pub ru_inblock: c_long,
            pub ru_oublock: c_long,
            pub ru_msgsnd: c_long,
            pub ru_msgrcv: c_long,
            pub ru_nsignals: c_long,
            pub ru_nvcsw: c_long,
            pub ru_nivcsw: c_long,

            #[cfg(target_env = "musl")]
            __reserved: [c_long; 16],
        }

        #[cfg_attr(target_os = "netbsd", repr(packed))]
        pub struct in_addr {
            pub s_addr: in_addr_t,
        }

        pub struct in6_addr {
            pub s6_addr: [u8; 16],
            __align: [u32; 0],
        }

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

        pub struct ipv6_mreq {
            pub ipv6mr_multiaddr: in6_addr,
            #[cfg(target_os = "android")]
            pub ipv6mr_interface: ::c_int,
            #[cfg(not(target_os = "android"))]
            pub ipv6mr_interface: ::c_uint,
        }

        pub struct hostent {
            pub h_name: *mut ::c_char,
            pub h_aliases: *mut *mut ::c_char,
            pub h_addrtype: ::c_int,
            pub h_length: ::c_int,
            pub h_addr_list: *mut *mut ::c_char,
        }

        pub struct iovec {
            pub iov_base: *mut ::c_void,
            pub iov_len: ::size_t,
        }

        pub struct pollfd {
            pub fd: ::c_int,
            pub events: ::c_short,
            pub revents: ::c_short,
        }
    }

    pub const WNOHANG: ::c_int = 1;
    pub const SIG_DFL: sighandler_t = 0 as sighandler_t;
    pub const SIG_IGN: sighandler_t = 1 as sighandler_t;
    pub const SIG_ERR: sighandler_t = !0 as sighandler_t;

    pub const DT_FIFO: u8 = 1;
    pub const DT_CHR: u8 = 2;
    pub const DT_DIR: u8 = 4;
    pub const DT_BLK: u8 = 6;
    pub const DT_REG: u8 = 8;
    pub const DT_LNK: u8 = 10;
    pub const DT_SOCK: u8 = 12;

    pub const FD_CLOEXEC: ::c_int = 0x1;

    pub const USRQUOTA: ::c_int = 0;
    pub const GRPQUOTA: ::c_int = 1;

    pub const SIGIOT: ::c_int = 6;

    pub const S_ISUID: ::c_int = 0x800;
    pub const S_ISGID: ::c_int = 0x400;
    pub const S_ISVTX: ::c_int = 0x200;

    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;

    cfg_if! {
        if #[cfg(feature = "default")] {
            // cargo build, don't pull in anything extra as the libstd  dep
            // already pulls in all libs.
        } else if #[cfg(target_env = "musl")] {
            #[link(name = "c", kind = "static")]
            extern {}
        } else if #[cfg(target_os = "emscripten")] {
            #[link(name = "c")]
            extern {}
        } else if #[cfg(any(target_os = "macos",
                            target_os = "ios",
                            target_os = "android",
                            target_os = "openbsd",
                            target_os = "bitrig"))] {
            #[link(name = "c")]
            #[link(name = "m")]
            extern {}
        } else {
            #[link(name = "c")]
            #[link(name = "m")]
            #[link(name = "rt")]
            extern {}
        }
    }

    extern {
        #[cfg_attr(target_os = "netbsd", link_name = "__socket30")]
        pub fn socket(domain: ::c_int, ty: ::c_int, protocol: ::c_int) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "connect$UNIX2003")]
        pub fn connect(socket: ::c_int, address: *const sockaddr,
                       len: socklen_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "bind$UNIX2003")]
        pub fn bind(socket: ::c_int, address: *const sockaddr,
                    address_len: socklen_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "listen$UNIX2003")]
        pub fn listen(socket: ::c_int, backlog: ::c_int) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "accept$UNIX2003")]
        pub fn accept(socket: ::c_int, address: *mut sockaddr,
                      address_len: *mut socklen_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "getpeername$UNIX2003")]
        pub fn getpeername(socket: ::c_int, address: *mut sockaddr,
                           address_len: *mut socklen_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "getsockname$UNIX2003")]
        pub fn getsockname(socket: ::c_int, address: *mut sockaddr,
                           address_len: *mut socklen_t) -> ::c_int;
        pub fn setsockopt(socket: ::c_int, level: ::c_int, name: ::c_int,
                          value: *const ::c_void,
                          option_len: socklen_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "socketpair$UNIX2003")]
        pub fn socketpair(domain: ::c_int, type_: ::c_int, protocol: ::c_int,
                          socket_vector: *mut ::c_int) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "sendto$UNIX2003")]
        pub fn sendto(socket: ::c_int, buf: *const ::c_void, len: ::size_t,
                      flags: ::c_int, addr: *const sockaddr,
                      addrlen: socklen_t) -> ::ssize_t;
        pub fn shutdown(socket: ::c_int, how: ::c_int) -> ::c_int;

        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "chmod$UNIX2003")]
        pub fn chmod(path: *const c_char, mode: mode_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "fchmod$UNIX2003")]
        pub fn fchmod(fd: ::c_int, mode: mode_t) -> ::c_int;

        #[cfg_attr(target_os = "macos", link_name = "fstat$INODE64")]
        #[cfg_attr(target_os = "netbsd", link_name = "__fstat50")]
        pub fn fstat(fildes: ::c_int, buf: *mut stat) -> ::c_int;

        pub fn mkdir(path: *const c_char, mode: mode_t) -> ::c_int;

        #[cfg_attr(target_os = "macos", link_name = "stat$INODE64")]
        #[cfg_attr(target_os = "netbsd", link_name = "__stat50")]
        pub fn stat(path: *const c_char, buf: *mut stat) -> ::c_int;

        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "popen$UNIX2003")]
        pub fn popen(command: *const c_char,
                     mode: *const c_char) -> *mut ::FILE;
        pub fn pclose(stream: *mut ::FILE) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "fdopen$UNIX2003")]
        pub fn fdopen(fd: ::c_int, mode: *const c_char) -> *mut ::FILE;
        pub fn fileno(stream: *mut ::FILE) -> ::c_int;

        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "open$UNIX2003")]
        pub fn open(path: *const c_char, oflag: ::c_int, ...) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "creat$UNIX2003")]
        pub fn creat(path: *const c_char, mode: mode_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "fcntl$UNIX2003")]
        pub fn fcntl(fd: ::c_int, cmd: ::c_int, ...) -> ::c_int;

        #[cfg_attr(all(target_os = "macos", target_arch = "x86_64"),
                   link_name = "opendir$INODE64")]
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "opendir$INODE64$UNIX2003")]
        #[cfg_attr(target_os = "netbsd", link_name = "__opendir30")]
        pub fn opendir(dirname: *const c_char) -> *mut ::DIR;
        #[cfg_attr(target_os = "macos", link_name = "readdir_r$INODE64")]
        #[cfg_attr(target_os = "netbsd", link_name = "__readdir_r30")]
        pub fn readdir_r(dirp: *mut ::DIR, entry: *mut ::dirent,
                         result: *mut *mut ::dirent) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "closedir$UNIX2003")]
        pub fn closedir(dirp: *mut ::DIR) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86_64"),
                   link_name = "rewinddir$INODE64")]
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "rewinddir$INODE64$UNIX2003")]
        pub fn rewinddir(dirp: *mut ::DIR);

        pub fn access(path: *const c_char, amode: ::c_int) -> ::c_int;
        pub fn alarm(seconds: ::c_uint) -> ::c_uint;
        pub fn chdir(dir: *const c_char) -> ::c_int;
        pub fn chown(path: *const c_char, uid: uid_t,
                     gid: gid_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "close$UNIX2003")]
        pub fn close(fd: ::c_int) -> ::c_int;
        pub fn dup(fd: ::c_int) -> ::c_int;
        pub fn dup2(src: ::c_int, dst: ::c_int) -> ::c_int;
        pub fn execv(prog: *const c_char,
                     argv: *const *const c_char) -> ::c_int;
        pub fn execve(prog: *const c_char, argv: *const *const c_char,
                      envp: *const *const c_char)
                      -> ::c_int;
        pub fn execvp(c: *const c_char,
                      argv: *const *const c_char) -> ::c_int;
        pub fn fork() -> pid_t;
        pub fn fpathconf(filedes: ::c_int, name: ::c_int) -> c_long;
        pub fn getcwd(buf: *mut c_char, size: ::size_t) -> *mut c_char;
        pub fn getegid() -> gid_t;
        pub fn geteuid() -> uid_t;
        pub fn getgid() -> gid_t;
        pub fn getgroups(ngroups_max: ::c_int, groups: *mut gid_t)
                         -> ::c_int;
        pub fn getlogin() -> *mut c_char;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "getopt$UNIX2003")]
        pub fn getopt(argc: ::c_int, argv: *const *mut c_char,
                      optstr: *const c_char) -> ::c_int;
        pub fn getpgrp() -> pid_t;
        pub fn getpid() -> pid_t;
        pub fn getppid() -> pid_t;
        pub fn getuid() -> uid_t;
        pub fn isatty(fd: ::c_int) -> ::c_int;
        pub fn link(src: *const c_char, dst: *const c_char) -> ::c_int;
        pub fn lseek(fd: ::c_int, offset: off_t, whence: ::c_int) -> off_t;
        pub fn pathconf(path: *const c_char, name: ::c_int) -> c_long;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "pause$UNIX2003")]
        pub fn pause() -> ::c_int;
        pub fn pipe(fds: *mut ::c_int) -> ::c_int;
        pub fn posix_memalign(memptr: *mut *mut ::c_void,
                          align: ::size_t,
                          size: ::size_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "read$UNIX2003")]
        pub fn read(fd: ::c_int, buf: *mut ::c_void, count: ::size_t)
                    -> ::ssize_t;
        pub fn rmdir(path: *const c_char) -> ::c_int;
        pub fn setgid(gid: gid_t) -> ::c_int;
        pub fn setpgid(pid: pid_t, pgid: pid_t) -> ::c_int;
        pub fn setsid() -> pid_t;
        pub fn setuid(uid: uid_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "sleep$UNIX2003")]
        pub fn sleep(secs: ::c_uint) -> ::c_uint;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "nanosleep$UNIX2003")]
        #[cfg_attr(target_os = "netbsd", link_name = "__nanosleep50")]
        pub fn nanosleep(rqtp: *const timespec,
                         rmtp: *mut timespec) -> ::c_int;
        pub fn tcgetpgrp(fd: ::c_int) -> pid_t;
        pub fn ttyname(fd: ::c_int) -> *mut c_char;
        pub fn unlink(c: *const c_char) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "wait$UNIX2003")]
        pub fn wait(status: *mut ::c_int) -> pid_t;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "waitpid$UNIX2003")]
        pub fn waitpid(pid: pid_t, status: *mut ::c_int, options: ::c_int)
                       -> pid_t;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "write$UNIX2003")]
        pub fn write(fd: ::c_int, buf: *const ::c_void, count: ::size_t)
                     -> ::ssize_t;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "pread$UNIX2003")]
        pub fn pread(fd: ::c_int, buf: *mut ::c_void, count: ::size_t,
                     offset: off_t) -> ::ssize_t;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "pwrite$UNIX2003")]
        pub fn pwrite(fd: ::c_int, buf: *const ::c_void, count: ::size_t,
                      offset: off_t) -> ::ssize_t;
        pub fn umask(mask: mode_t) -> mode_t;

        #[cfg_attr(target_os = "netbsd", link_name = "__utime50")]
        pub fn utime(file: *const c_char, buf: *const utimbuf) -> ::c_int;

        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                       link_name = "kill$UNIX2003")]
        pub fn kill(pid: pid_t, sig: ::c_int) -> ::c_int;

        pub fn mlock(addr: *const ::c_void, len: ::size_t) -> ::c_int;
        pub fn munlock(addr: *const ::c_void, len: ::size_t) -> ::c_int;
        pub fn mlockall(flags: ::c_int) -> ::c_int;
        pub fn munlockall() -> ::c_int;

        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "mmap$UNIX2003")]
        pub fn mmap(addr: *mut ::c_void,
                    len: ::size_t,
                    prot: ::c_int,
                    flags: ::c_int,
                    fd: ::c_int,
                    offset: off_t)
                    -> *mut ::c_void;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "munmap$UNIX2003")]
        pub fn munmap(addr: *mut ::c_void, len: ::size_t) -> ::c_int;

        pub fn if_nametoindex(ifname: *const c_char) -> ::c_uint;

        #[cfg_attr(target_os = "macos", link_name = "lstat$INODE64")]
        #[cfg_attr(target_os = "netbsd", link_name = "__lstat50")]
        pub fn lstat(path: *const c_char, buf: *mut stat) -> ::c_int;

        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "fsync$UNIX2003")]
        pub fn fsync(fd: ::c_int) -> ::c_int;

        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "setenv$UNIX2003")]
        pub fn setenv(name: *const c_char, val: *const c_char,
                      overwrite: ::c_int) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "unsetenv$UNIX2003")]
        #[cfg_attr(target_os = "netbsd", link_name = "__unsetenv13")]
        pub fn unsetenv(name: *const c_char) -> ::c_int;

        pub fn symlink(path1: *const c_char,
                       path2: *const c_char) -> ::c_int;

        pub fn ftruncate(fd: ::c_int, length: off_t) -> ::c_int;

        #[cfg_attr(target_os = "android", link_name = "bsd_signal")]
        pub fn signal(signum: ::c_int, handler: sighandler_t) -> sighandler_t;

        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "getrlimit$UNIX2003")]
        pub fn getrlimit(resource: ::c_int, rlim: *mut rlimit) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "setrlimit$UNIX2003")]
        pub fn setrlimit(resource: ::c_int, rlim: *const rlimit) -> ::c_int;
        #[cfg_attr(target_os = "netbsd", link_name = "__getrusage50")]
        pub fn getrusage(resource: ::c_int, usage: *mut rusage) -> ::c_int;

        pub fn getdtablesize() -> ::c_int;
        #[cfg_attr(any(target_os = "macos", target_os = "ios"),
                   link_name = "realpath$DARWIN_EXTSN")]
        pub fn realpath(pathname: *const ::c_char, resolved: *mut ::c_char)
                        -> *mut ::c_char;

        pub fn flock(fd: ::c_int, operation: ::c_int) -> ::c_int;

        #[cfg_attr(arget_os = "netbsd", link_name = "__gettimeofday50")]
        pub fn gettimeofday(tp: *mut ::timeval,
                            tz: *mut ::c_void) -> ::c_int;

        pub fn pthread_self() -> ::pthread_t;
        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;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "pthread_join$UNIX2003")]
        pub fn pthread_join(native: ::pthread_t,
                            value: *mut *mut ::c_void) -> ::c_int;
        pub fn pthread_attr_init(attr: *mut ::pthread_attr_t) -> ::c_int;
        pub fn pthread_attr_destroy(attr: *mut ::pthread_attr_t) -> ::c_int;
        pub fn pthread_attr_setstacksize(attr: *mut ::pthread_attr_t,
                                         stack_size: ::size_t) -> ::c_int;
        pub fn pthread_attr_setdetachstate(attr: *mut ::pthread_attr_t,
                                           state: ::c_int) -> ::c_int;
        pub fn pthread_detach(thread: ::pthread_t) -> ::c_int;
        #[cfg_attr(target_os = "netbsd", link_name = "__libc_thr_yield")]
        pub fn sched_yield() -> ::c_int;
        pub fn pthread_key_create(key: *mut pthread_key_t,
                                  dtor: ::dox::Option<unsafe extern fn(*mut ::c_void)>)
                                  -> ::c_int;
        pub fn pthread_key_delete(key: pthread_key_t) -> ::c_int;
        pub fn pthread_getspecific(key: pthread_key_t) -> *mut ::c_void;
        pub fn pthread_setspecific(key: pthread_key_t, value: *const ::c_void)
                                   -> ::c_int;
        pub fn pthread_mutex_init(lock: *mut pthread_mutex_t,
                                  attr: *const pthread_mutexattr_t) -> ::c_int;
        pub fn pthread_mutex_destroy(lock: *mut pthread_mutex_t) -> ::c_int;
        pub fn pthread_mutex_lock(lock: *mut pthread_mutex_t) -> ::c_int;
        pub fn pthread_mutex_trylock(lock: *mut pthread_mutex_t) -> ::c_int;
        pub fn pthread_mutex_unlock(lock: *mut pthread_mutex_t) -> ::c_int;

        pub fn pthread_mutexattr_init(attr: *mut pthread_mutexattr_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "pthread_mutexattr_destroy$UNIX2003")]
        pub fn pthread_mutexattr_destroy(attr: *mut pthread_mutexattr_t) -> ::c_int;
        pub fn pthread_mutexattr_settype(attr: *mut pthread_mutexattr_t,
                                         _type: ::c_int) -> ::c_int;

        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "pthread_cond_wait$UNIX2003")]
        pub fn pthread_cond_wait(cond: *mut pthread_cond_t,
                                 lock: *mut pthread_mutex_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "pthread_cond_timedwait$UNIX2003")]
        pub fn pthread_cond_timedwait(cond: *mut pthread_cond_t,
                                  lock: *mut pthread_mutex_t,
                                  abstime: *const ::timespec) -> ::c_int;
        pub fn pthread_cond_signal(cond: *mut pthread_cond_t) -> ::c_int;
        pub fn pthread_cond_broadcast(cond: *mut pthread_cond_t) -> ::c_int;
        pub fn pthread_cond_destroy(cond: *mut pthread_cond_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "pthread_rwlock_destroy$UNIX2003")]
        pub fn pthread_rwlock_destroy(lock: *mut pthread_rwlock_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "pthread_rwlock_rdlock$UNIX2003")]
        pub fn pthread_rwlock_rdlock(lock: *mut pthread_rwlock_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "pthread_rwlock_tryrdlock$UNIX2003")]
        pub fn pthread_rwlock_tryrdlock(lock: *mut pthread_rwlock_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "pthread_rwlock_wrlock$UNIX2003")]
        pub fn pthread_rwlock_wrlock(lock: *mut pthread_rwlock_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "pthread_rwlock_trywrlock$UNIX2003")]
        pub fn pthread_rwlock_trywrlock(lock: *mut pthread_rwlock_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "pthread_rwlock_unlock$UNIX2003")]
        pub fn pthread_rwlock_unlock(lock: *mut pthread_rwlock_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;

        // #[cfg_attr(target_os = "linux", link_name = "__xpg_strerror_r")]
        pub fn strerror_r(errnum: ::c_int, buf: *mut c_char,
                          buflen: ::size_t) -> ::c_int;

        pub fn getsockopt(sockfd: ::c_int,
                          level: ::c_int,
                          optname: ::c_int,
                          optval: *mut ::c_void,
                          optlen: *mut ::socklen_t) -> ::c_int;
        pub fn raise(signum: ::c_int) -> ::c_int;
        pub fn sigaction(signum: ::c_int,
                         act: *const sigaction,
                         oldact: *mut sigaction) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "sigaltstack$UNIX2003")]
        pub fn sigaltstack(ss: *const stack_t,
                           oss: *mut stack_t) -> ::c_int;

        #[cfg_attr(target_os = "netbsd", link_name = "__utimes50")]
        pub fn utimes(filename: *const ::c_char,
                      times: *const ::timeval) -> ::c_int;
        pub fn dlopen(filename: *const ::c_char,
                      flag: ::c_int) -> *mut ::c_void;
        pub fn dlerror() -> *mut ::c_char;
        pub fn dlsym(handle: *mut ::c_void,
                     symbol: *const ::c_char) -> *mut ::c_void;
        pub fn dlclose(handle: *mut ::c_void) -> ::c_int;
        pub fn dladdr(addr: *const ::c_void, info: *mut Dl_info) -> ::c_int;

        pub fn getaddrinfo(node: *const c_char,
                           service: *const c_char,
                           hints: *const addrinfo,
                           res: *mut *mut addrinfo) -> ::c_int;
        pub fn freeaddrinfo(res: *mut addrinfo);
        pub fn gai_strerror(errcode: ::c_int) -> *const ::c_char;

        #[cfg_attr(target_os = "netbsd", link_name = "__gmtime_r50")]
        pub fn gmtime_r(time_p: *const time_t, result: *mut tm) -> *mut tm;
        #[cfg_attr(target_os = "netbsd", link_name = "__localtime_r50")]
        pub fn localtime_r(time_p: *const time_t, result: *mut tm) -> *mut tm;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "mktime$UNIX2003")]
        #[cfg_attr(target_os = "netbsd", link_name = "__mktime50")]
        pub fn mktime(tm: *mut tm) -> time_t;

        #[cfg_attr(target_os = "netbsd", link_name = "__mknod50")]
        pub fn mknod(pathname: *const ::c_char, mode: ::mode_t,
                     dev: ::dev_t) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "writev$UNIX2003")]
        pub fn writev(fd: ::c_int, iov: *const ::iovec, iovcnt: ::c_int) -> ::ssize_t;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "readv$UNIX2003")]
        pub fn readv(fd: ::c_int, iov: *const ::iovec, iovcnt: ::c_int) -> ::ssize_t;
        pub fn uname(buf: *mut ::utsname) -> ::c_int;
        pub fn daemon(nochdir: ::c_int, noclose: ::c_int) -> ::c_int;
        pub fn gethostname(name: *mut ::c_char, len: ::size_t) -> ::c_int;
        pub fn chroot(name: *const ::c_char) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "usleep$UNIX2003")]
        pub fn usleep(secs: ::c_uint) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "send$UNIX2003")]
        pub fn send(socket: ::c_int, buf: *const ::c_void, len: ::size_t,
                    flags: ::c_int) -> ::ssize_t;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "recv$UNIX2003")]
        pub fn recv(socket: ::c_int, buf: *mut ::c_void, len: ::size_t,
                    flags: ::c_int) -> ::ssize_t;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "putenv$UNIX2003")]
        #[cfg_attr(target_os = "netbsd", link_name = "__putenv50")]
        pub fn putenv(string: *mut c_char) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "sendmsg$UNIX2003")]
        pub fn sendmsg(fd: ::c_int, msg: *const msghdr, flags: ::c_int) -> ::ssize_t;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "recvmsg$UNIX2003")]
        pub fn recvmsg(fd: ::c_int, msg: *mut msghdr, flags: ::c_int) -> ::ssize_t;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "poll$UNIX2003")]
        pub fn poll(fds: *mut pollfd, nfds: nfds_t, timeout: ::c_int) -> ::c_int;
    }

    // TODO: get rid of this #[cfg(not(...))]
    #[cfg(not(target_os = "android"))]
    extern {
        pub fn getifaddrs(ifap: *mut *mut ifaddrs) -> ::c_int;
        pub fn freeifaddrs(ifa: *mut ifaddrs);
        #[cfg_attr(target_os = "macos", link_name = "glob$INODE64")]
        #[cfg_attr(target_os = "netbsd", link_name = "__glob30")]
        pub fn glob(pattern: *const c_char,
                    flags: ::c_int,
                    errfunc: ::dox::Option<extern "C" fn(epath: *const c_char,
                                                         errno: ::c_int) -> ::c_int>,
                    pglob: *mut glob_t) -> ::c_int;
        #[cfg_attr(target_os = "netbsd", link_name = "__globfree30")]
        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;

        #[cfg_attr(all(target_os = "macos", target_arch = "x86_64"),
                   link_name = "seekdir$INODE64")]
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "seekdir$INODE64$UNIX2003")]
        pub fn seekdir(dirp: *mut ::DIR, loc: c_long);

        #[cfg_attr(all(target_os = "macos", target_arch = "x86_64"),
                   link_name = "telldir$INODE64")]
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "telldir$INODE64$UNIX2003")]
        pub fn telldir(dirp: *mut ::DIR) -> c_long;

        pub fn getsid(pid: pid_t) -> pid_t;
        pub fn madvise(addr: *mut ::c_void, len: ::size_t, advice: ::c_int)
                       -> ::c_int;
        pub fn readlink(path: *const c_char,
                        buf: *mut c_char,
                        bufsz: ::size_t)
                        -> ::ssize_t;

        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "msync$UNIX2003")]
        #[cfg_attr(target_os = "netbsd", link_name = "__msync13")]
        pub fn msync(addr: *mut ::c_void, len: ::size_t, flags: ::c_int) -> ::c_int;
        pub fn sysconf(name: ::c_int) -> c_long;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "recvfrom$UNIX2003")]
        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 mkfifo(path: *const c_char, mode: mode_t) -> ::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_attr(target_os = "netbsd", link_name = "__sigemptyset14")]
        pub fn sigemptyset(set: *mut sigset_t) -> ::c_int;
        #[cfg_attr(target_os = "netbsd", link_name = "__sigaddset14")]
        pub fn sigaddset(set: *mut sigset_t, signum: ::c_int) -> ::c_int;
        #[cfg_attr(target_os = "netbsd", link_name = "__sigfillset14")]
        pub fn sigfillset(set: *mut sigset_t) -> ::c_int;
        #[cfg_attr(target_os = "netbsd", link_name = "__sigdelset14")]
        pub fn sigdelset(set: *mut sigset_t, signum: ::c_int) -> ::c_int;
        #[cfg_attr(target_os = "netbsd", link_name = "__sigismember14")]
        pub fn sigismember(set: *const sigset_t, signum: ::c_int) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86_64"),
                   link_name = "select$1050")]
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "select$UNIX2003")]
        #[cfg_attr(target_os = "netbsd", link_name = "__select50")]
        pub fn select(nfds: ::c_int,
                      readfs: *mut fd_set,
                      writefds: *mut fd_set,
                      errorfds: *mut fd_set,
                      timeout: *mut timeval) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86_64"),
                   link_name = "pselect$1050")]
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "pselect$UNIX2003")]
        #[cfg_attr(target_os = "netbsd", link_name = "__pselect50")]
        pub fn pselect(nfds: ::c_int,
                       readfs: *mut fd_set,
                       writefds: *mut fd_set,
                       errorfds: *mut fd_set,
                       timeout: *const timespec,
                       sigmask: *const sigset_t) -> ::c_int;
        pub fn fseeko(stream: *mut ::FILE,
                      offset: ::off_t,
                      whence: ::c_int) -> ::c_int;
        pub fn ftello(stream: *mut ::FILE) -> ::off_t;
        #[cfg_attr(target_os = "netbsd", link_name = "__timegm50")]
        pub fn timegm(tm: *mut ::tm) -> time_t;
        pub fn statvfs(path: *const c_char, buf: *mut statvfs) -> ::c_int;
        pub fn fstatvfs(fd: ::c_int, buf: *mut statvfs) -> ::c_int;
        #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                   link_name = "tcdrain$UNIX2003")]
        pub fn tcdrain(fd: ::c_int) -> ::c_int;
        pub fn cfgetispeed(termios: *const ::termios) -> ::speed_t;
        pub fn cfgetospeed(termios: *const ::termios) -> ::speed_t;
        pub fn cfsetispeed(termios: *mut ::termios, speed: ::speed_t) -> ::c_int;
        pub fn cfsetospeed(termios: *mut ::termios, speed: ::speed_t) -> ::c_int;
        pub fn tcgetattr(fd: ::c_int, termios: *mut ::termios) -> ::c_int;
        pub fn tcsetattr(fd: ::c_int,
                         optional_actions: ::c_int,
                         termios: *const ::termios) -> ::c_int;
        pub fn tcflow(fd: ::c_int, action: ::c_int) -> ::c_int;
        pub fn tcflush(fd: ::c_int, action: ::c_int) -> ::c_int;
        pub fn tcsendbreak(fd: ::c_int, duration: ::c_int) -> ::c_int;
    }

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

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