# mod.rs.html -- source
Source to the Rust file `/home/travis/.cargo/registry/src/github.com-1ecc6299db9ec823/libc-0.2.65/src/unix/mod.rs`.
Keywords: rust, rustlang, rust-lang

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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 c_schar = i8;
    pub type c_uchar = u8;
    pub type c_short = i16;
    pub type c_ushort = u16;
    pub type c_int = i32;
    pub type c_uint = u32;
    pub type c_float = f32;
    pub type c_double = f64;
    pub type c_longlong = i64;
    pub type c_ulonglong = u64;
    pub type intmax_t = i64;
    pub type uintmax_t = u64;

    pub type size_t = usize;
    pub type ptrdiff_t = isize;
    pub type intptr_t = isize;
    pub type uintptr_t = usize;
    pub type ssize_t = isize;

    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;

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

    s! {
        pub struct group {
            pub gr_name: *mut ::c_char,
            pub gr_passwd: *mut ::c_char,
            pub gr_gid: ::gid_t,
            pub gr_mem: *mut *mut ::c_char,
        }

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

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

        // linux x32 compatibility
        // See https://sourceware.org/bugzilla/show_bug.cgi?id=16437
        pub struct timespec {
            pub tv_sec: time_t,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            pub tv_nsec: i64,
            #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
            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,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            __pad1: u32,
            pub ru_ixrss: c_long,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            __pad2: u32,
            pub ru_idrss: c_long,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            __pad3: u32,
            pub ru_isrss: c_long,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            __pad4: u32,
            pub ru_minflt: c_long,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            __pad5: u32,
            pub ru_majflt: c_long,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            __pad6: u32,
            pub ru_nswap: c_long,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            __pad7: u32,
            pub ru_inblock: c_long,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            __pad8: u32,
            pub ru_oublock: c_long,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            __pad9: u32,
            pub ru_msgsnd: c_long,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            __pad10: u32,
            pub ru_msgrcv: c_long,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            __pad11: u32,
            pub ru_nsignals: c_long,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            __pad12: u32,
            pub ru_nvcsw: c_long,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            __pad13: u32,
            pub ru_nivcsw: c_long,
            #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
            __pad14: u32,

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

        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 struct winsize {
            pub ws_row: ::c_ushort,
            pub ws_col: ::c_ushort,
            pub ws_xpixel: ::c_ushort,
            pub ws_ypixel: ::c_ushort,
        }

        pub struct linger {
            pub l_onoff: ::c_int,
            pub l_linger: ::c_int,
        }

        pub struct sigval {
            // Actually a union of an int and a void*
            pub sival_ptr: *mut ::c_void
        }

        // <sys/time.h>
        pub struct itimerval {
            pub it_interval: ::timeval,
            pub it_value: ::timeval,
        }

        // <sys/times.h>
        pub struct tms {
            pub tms_utime: ::clock_t,
            pub tms_stime: ::clock_t,
            pub tms_cutime: ::clock_t,
            pub tms_cstime: ::clock_t,
        }

        pub struct servent {
            pub s_name: *mut ::c_char,
            pub s_aliases: *mut *mut ::c_char,
            pub s_port: ::c_int,
            pub s_proto: *mut ::c_char,
        }

        pub struct protoent {
            pub p_name: *mut ::c_char,
            pub p_aliases: *mut *mut ::c_char,
            pub p_proto: ::c_int,
        }
    }

    pub const INT_MIN: c_int = -2147483648;
    pub const INT_MAX: c_int = 2147483647;

    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_UNKNOWN: u8 = 0;
    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;

    cfg_if! {
        if #[cfg(not(target_os = "redox"))] {
            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: ::mode_t = 0x800;
    pub const S_ISGID: ::mode_t = 0x400;
    pub const S_ISVTX: ::mode_t = 0x200;

    pub const IF_NAMESIZE: ::size_t = 16;
    pub const IFNAMSIZ: ::size_t = IF_NAMESIZE;

    pub const LOG_EMERG: ::c_int = 0;
    pub const LOG_ALERT: ::c_int = 1;
    pub const LOG_CRIT: ::c_int = 2;
    pub const LOG_ERR: ::c_int = 3;
    pub const LOG_WARNING: ::c_int = 4;
    pub const LOG_NOTICE: ::c_int = 5;
    pub const LOG_INFO: ::c_int = 6;
    pub const LOG_DEBUG: ::c_int = 7;

    pub const LOG_KERN: ::c_int = 0;
    pub const LOG_USER: ::c_int = 1 << 3;
    pub const LOG_MAIL: ::c_int = 2 << 3;
    pub const LOG_DAEMON: ::c_int = 3 << 3;
    pub const LOG_AUTH: ::c_int = 4 << 3;
    pub const LOG_SYSLOG: ::c_int = 5 << 3;
    pub const LOG_LPR: ::c_int = 6 << 3;
    pub const LOG_NEWS: ::c_int = 7 << 3;
    pub const LOG_UUCP: ::c_int = 8 << 3;
    pub const LOG_LOCAL0: ::c_int = 16 << 3;
    pub const LOG_LOCAL1: ::c_int = 17 << 3;
    pub const LOG_LOCAL2: ::c_int = 18 << 3;
    pub const LOG_LOCAL3: ::c_int = 19 << 3;
    pub const LOG_LOCAL4: ::c_int = 20 << 3;
    pub const LOG_LOCAL5: ::c_int = 21 << 3;
    pub const LOG_LOCAL6: ::c_int = 22 << 3;
    pub const LOG_LOCAL7: ::c_int = 23 << 3;

    pub const LOG_PID: ::c_int = 0x01;
    pub const LOG_CONS: ::c_int = 0x02;
    pub const LOG_ODELAY: ::c_int = 0x04;
    pub const LOG_NDELAY: ::c_int = 0x08;
    pub const LOG_NOWAIT: ::c_int = 0x10;

    pub const LOG_PRIMASK: ::c_int = 7;
    pub const LOG_FACMASK: ::c_int = 0x3f8;

    pub const PRIO_PROCESS: ::c_int = 0;
    pub const PRIO_PGRP: ::c_int = 1;
    pub const PRIO_USER: ::c_int = 2;

    pub const PRIO_MIN: ::c_int = -20;
    pub const PRIO_MAX: ::c_int = 20;

    pub const IPPROTO_ICMP: ::c_int = 1;
    pub const IPPROTO_ICMPV6: ::c_int = 58;
    pub const IPPROTO_TCP: ::c_int = 6;
    pub const IPPROTO_UDP: ::c_int = 17;
    pub const IPPROTO_IP: ::c_int = 0;
    pub const IPPROTO_IPV6: ::c_int = 41;

    pub const INADDR_LOOPBACK: in_addr_t = 2130706433;
    pub const INADDR_ANY: in_addr_t = 0;
    pub const INADDR_BROADCAST: in_addr_t = 4294967295;
    pub const INADDR_NONE: in_addr_t = 4294967295;

    pub const ARPOP_REQUEST: u16 = 1;
    pub const ARPOP_REPLY: u16 = 2;

    pub const ATF_COM: ::c_int = 0x02;
    pub const ATF_PERM: ::c_int = 0x04;
    pub const ATF_PUBL: ::c_int = 0x08;
    pub const ATF_USETRAILERS: ::c_int = 0x10;

    cfg_if! {
        if #[cfg(target_os = "l4re")] {
            // required libraries for L4Re are linked externally, ATM
        } else if #[cfg(feature = "std")] {
            // cargo build, don't pull in anything extra as the libstd dep
            // already pulls in all libs.
        } else if #[cfg(target_env = "musl")] {
            #[cfg_attr(feature = "rustc-dep-of-std",
                       link(name = "c", kind = "static",
                            cfg(target_feature = "crt-static")))]
            #[cfg_attr(feature = "rustc-dep-of-std",
                       link(name = "c", cfg(not(target_feature = "crt-static"))))]
            extern {}
        } else if #[cfg(target_os = "emscripten")] {
            #[link(name = "c")]
            extern {}
        } else if #[cfg(all(target_os = "netbsd",
                            feature = "rustc-dep-of-std",
                            target_vendor = "rumprun"))] {
            // Since we don't use -nodefaultlibs on Rumprun, libc is always pulled
            // in automatically by the linker. We avoid passing it explicitly, as it
            // causes some versions of binutils to crash with an assertion failure.
            #[link(name = "m")]
            extern {}
        } else if #[cfg(any(target_os = "macos",
                            target_os = "ios",
                            target_os = "android",
                            target_os = "openbsd"))] {
            #[link(name = "c")]
            #[link(name = "m")]
            extern {}
        } else if #[cfg(target_os = "haiku")] {
            #[link(name = "root")]
            #[link(name = "network")]
            extern {}
        } else if #[cfg(target_env = "newlib")] {
            #[link(name = "c")]
            #[link(name = "m")]
            extern {}
        } else if #[cfg(target_os = "hermit")] {
            // no_default_libraries is set to false for HermitCore, so only a link
            // to "pthread" needs to be added.
            #[link(name = "pthread")]
            extern {}
        } else if #[cfg(target_env = "illumos")] {
            #[link(name = "c")]
            #[link(name = "m")]
            extern {}
        } else if #[cfg(target_os = "redox")] {
            #[cfg_attr(feature = "rustc-dep-of-std",
                       link(name = "c", kind = "static-nobundle",
                            cfg(target_feature = "crt-static")))]
            #[cfg_attr(feature = "rustc-dep-of-std",
                       link(name = "c", cfg(not(target_feature = "crt-static"))))]
            extern {}
        } else {
            #[link(name = "c")]
            #[link(name = "m")]
            #[link(name = "rt")]
            #[link(name = "pthread")]
            extern {}
        }
    }

    #[cfg_attr(feature = "extra_traits", derive(Debug))]
    pub enum FILE {}
    impl ::Copy for FILE {}
    impl ::Clone for FILE {
        fn clone(&self) -> FILE {
            *self
        }
    }
    #[cfg_attr(feature = "extra_traits", derive(Debug))]
    pub enum fpos_t {} // TODO: fill this out with a struct
    impl ::Copy for fpos_t {}
    impl ::Clone for fpos_t {
        fn clone(&self) -> fpos_t {
            *self
        }
    }

    extern "C" {
        pub fn isalnum(c: c_int) -> c_int;
        pub fn isalpha(c: c_int) -> c_int;
        pub fn iscntrl(c: c_int) -> c_int;
        pub fn isdigit(c: c_int) -> c_int;
        pub fn isgraph(c: c_int) -> c_int;
        pub fn islower(c: c_int) -> c_int;
        pub fn isprint(c: c_int) -> c_int;
        pub fn ispunct(c: c_int) -> c_int;
        pub fn isspace(c: c_int) -> c_int;
        pub fn isupper(c: c_int) -> c_int;
        pub fn isxdigit(c: c_int) -> c_int;
        pub fn isblank(c: c_int) -> c_int;
        pub fn tolower(c: c_int) -> c_int;
        pub fn toupper(c: c_int) -> c_int;
        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86"),
            link_name = "fopen$UNIX2003"
        )]
        pub fn fopen(filename: *const c_char, mode: *const c_char) -> *mut FILE;
        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86"),
            link_name = "freopen$UNIX2003"
        )]
        pub fn freopen(
            filename: *const c_char,
            mode: *const c_char,
            file: *mut FILE,
        ) -> *mut FILE;
        pub fn fflush(file: *mut FILE) -> c_int;
        pub fn fclose(file: *mut FILE) -> c_int;
        pub fn remove(filename: *const c_char) -> c_int;
        pub fn rename(oldname: *const c_char, newname: *const c_char) -> c_int;
        pub fn tmpfile() -> *mut FILE;
        pub fn setvbuf(
            stream: *mut FILE,
            buffer: *mut c_char,
            mode: c_int,
            size: size_t,
        ) -> c_int;
        pub fn setbuf(stream: *mut FILE, buf: *mut c_char);
        pub fn getchar() -> c_int;
        pub fn putchar(c: c_int) -> c_int;
        pub fn fgetc(stream: *mut FILE) -> c_int;
        pub fn fgets(buf: *mut c_char, n: c_int, stream: *mut FILE)
            -> *mut c_char;
        pub fn fputc(c: c_int, stream: *mut FILE) -> c_int;
        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86"),
            link_name = "fputs$UNIX2003"
        )]
        pub fn fputs(s: *const c_char, stream: *mut FILE) -> c_int;
        pub fn puts(s: *const c_char) -> c_int;
        pub fn ungetc(c: c_int, stream: *mut FILE) -> c_int;
        pub fn fread(
            ptr: *mut c_void,
            size: size_t,
            nobj: size_t,
            stream: *mut FILE,
        ) -> size_t;
        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86"),
            link_name = "fwrite$UNIX2003"
        )]
        pub fn fwrite(
            ptr: *const c_void,
            size: size_t,
            nobj: size_t,
            stream: *mut FILE,
        ) -> size_t;
        pub fn fseek(stream: *mut FILE, offset: c_long, whence: c_int) -> c_int;
        pub fn ftell(stream: *mut FILE) -> c_long;
        pub fn rewind(stream: *mut FILE);
        #[cfg_attr(target_os = "netbsd", link_name = "__fgetpos50")]
        pub fn fgetpos(stream: *mut FILE, ptr: *mut fpos_t) -> c_int;
        #[cfg_attr(target_os = "netbsd", link_name = "__fsetpos50")]
        pub fn fsetpos(stream: *mut FILE, ptr: *const fpos_t) -> c_int;
        pub fn feof(stream: *mut FILE) -> c_int;
        pub fn ferror(stream: *mut FILE) -> c_int;
        pub fn perror(s: *const c_char);
        pub fn atoi(s: *const c_char) -> c_int;
        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86"),
            link_name = "strtod$UNIX2003"
        )]
        pub fn strtod(s: *const c_char, endp: *mut *mut c_char) -> c_double;
        pub fn strtol(
            s: *const c_char,
            endp: *mut *mut c_char,
            base: c_int,
        ) -> c_long;
        pub fn strtoul(
            s: *const c_char,
            endp: *mut *mut c_char,
            base: c_int,
        ) -> c_ulong;
        pub fn calloc(nobj: size_t, size: size_t) -> *mut c_void;
        pub fn malloc(size: size_t) -> *mut c_void;
        pub fn realloc(p: *mut c_void, size: size_t) -> *mut c_void;
        pub fn free(p: *mut c_void);
        pub fn abort() -> !;
        pub fn exit(status: c_int) -> !;
        pub fn _exit(status: c_int) -> !;
        pub fn atexit(cb: extern "C" fn()) -> c_int;
        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86"),
            link_name = "system$UNIX2003"
        )]
        pub fn system(s: *const c_char) -> c_int;
        pub fn getenv(s: *const c_char) -> *mut c_char;

        pub fn strcpy(dst: *mut c_char, src: *const c_char) -> *mut c_char;
        pub fn strncpy(
            dst: *mut c_char,
            src: *const c_char,
            n: size_t,
        ) -> *mut c_char;
        pub fn strcat(s: *mut c_char, ct: *const c_char) -> *mut c_char;
        pub fn strncat(
            s: *mut c_char,
            ct: *const c_char,
            n: size_t,
        ) -> *mut c_char;
        pub fn strcmp(cs: *const c_char, ct: *const c_char) -> c_int;
        pub fn strncmp(cs: *const c_char, ct: *const c_char, n: size_t) -> c_int;
        pub fn strcoll(cs: *const c_char, ct: *const c_char) -> c_int;
        pub fn strchr(cs: *const c_char, c: c_int) -> *mut c_char;
        pub fn strrchr(cs: *const c_char, c: c_int) -> *mut c_char;
        pub fn strspn(cs: *const c_char, ct: *const c_char) -> size_t;
        pub fn strcspn(cs: *const c_char, ct: *const c_char) -> size_t;
        pub fn strdup(cs: *const c_char) -> *mut c_char;
        pub fn strpbrk(cs: *const c_char, ct: *const c_char) -> *mut c_char;
        pub fn strstr(cs: *const c_char, ct: *const c_char) -> *mut c_char;
        pub fn strcasecmp(s1: *const c_char, s2: *const c_char) -> c_int;
        pub fn strncasecmp(
            s1: *const c_char,
            s2: *const c_char,
            n: size_t,
        ) -> c_int;
        pub fn strlen(cs: *const c_char) -> size_t;
        pub fn strnlen(cs: *const c_char, maxlen: size_t) -> size_t;
        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86"),
            link_name = "strerror$UNIX2003"
        )]
        pub fn strerror(n: c_int) -> *mut c_char;
        pub fn strtok(s: *mut c_char, t: *const c_char) -> *mut c_char;
        pub fn strxfrm(s: *mut c_char, ct: *const c_char, n: size_t) -> size_t;
        pub fn wcslen(buf: *const wchar_t) -> size_t;
        pub fn wcstombs(
            dest: *mut c_char,
            src: *const wchar_t,
            n: size_t,
        ) -> ::size_t;

        pub fn memchr(cx: *const c_void, c: c_int, n: size_t) -> *mut c_void;
        pub fn memcmp(cx: *const c_void, ct: *const c_void, n: size_t) -> c_int;
        pub fn memcpy(
            dest: *mut c_void,
            src: *const c_void,
            n: size_t,
        ) -> *mut c_void;
        pub fn memmove(
            dest: *mut c_void,
            src: *const c_void,
            n: size_t,
        ) -> *mut c_void;
        pub fn memset(dest: *mut c_void, c: c_int, n: size_t) -> *mut c_void;
    }

    extern "C" {
        #[cfg_attr(target_os = "netbsd", link_name = "__getpwnam50")]
        pub fn getpwnam(name: *const ::c_char) -> *mut passwd;
        #[cfg_attr(target_os = "netbsd", link_name = "__getpwuid50")]
        pub fn getpwuid(uid: ::uid_t) -> *mut passwd;

        pub fn fprintf(
            stream: *mut ::FILE,
            format: *const ::c_char,
            ...
        ) -> ::c_int;
        pub fn printf(format: *const ::c_char, ...) -> ::c_int;
        pub fn snprintf(
            s: *mut ::c_char,
            n: ::size_t,
            format: *const ::c_char,
            ...
        ) -> ::c_int;
        pub fn sprintf(s: *mut ::c_char, format: *const ::c_char, ...) -> ::c_int;
        #[cfg_attr(target_os = "linux", link_name = "__isoc99_fscanf")]
        pub fn fscanf(
            stream: *mut ::FILE,
            format: *const ::c_char,
            ...
        ) -> ::c_int;
        #[cfg_attr(target_os = "linux", link_name = "__isoc99_scanf")]
        pub fn scanf(format: *const ::c_char, ...) -> ::c_int;
        #[cfg_attr(target_os = "linux", link_name = "__isoc99_sscanf")]
        pub fn sscanf(s: *const ::c_char, format: *const ::c_char, ...)
            -> ::c_int;
        pub fn getchar_unlocked() -> ::c_int;
        pub fn putchar_unlocked(c: ::c_int) -> ::c_int;

        #[cfg_attr(target_os = "netbsd", link_name = "__socket30")]
        #[cfg_attr(target_os = "illumos", link_name = "__xnet_socket")]
        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$UNIX2003"
        )]
        #[cfg_attr(target_os = "illumos", link_name = "__xnet_connect")]
        pub fn connect(
            socket: ::c_int,
            address: *const sockaddr,
            len: socklen_t,
        ) -> ::c_int;
        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86"),
            link_name = "listen$UNIX2003"
        )]
        #[cfg_attr(target_os = "illumos", link_name = "__xnet_listen")]
        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"
        )]
        #[cfg_attr(target_os = "illumos", link_name = "__xnet_socketpair")]
        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"
        )]
        #[cfg_attr(target_os = "illumos", link_name = "__xnet_sendto")]
        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")]
        #[cfg_attr(
            all(target_os = "freebsd", any(freebsd11, freebsd10)),
            link_name = "fstat@FBSD_1.0"
        )]
        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")]
        #[cfg_attr(
            all(target_os = "freebsd", any(freebsd11, freebsd10)),
            link_name = "stat@FBSD_1.0"
        )]
        pub fn stat(path: *const c_char, buf: *mut stat) -> ::c_int;

        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$INODE64")]
        #[cfg_attr(target_os = "netbsd", link_name = "__readdir30")]
        #[cfg_attr(
            all(target_os = "freebsd", any(freebsd11, freebsd10)),
            link_name = "readdir@FBSD_1.0"
        )]
        pub fn readdir(dirp: *mut ::DIR) -> *mut ::dirent;
        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86"),
            link_name = "closedir$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 fchmodat(
            dirfd: ::c_int,
            pathname: *const ::c_char,
            mode: ::mode_t,
            flags: ::c_int,
        ) -> ::c_int;
        pub fn fchown(fd: ::c_int, owner: ::uid_t, group: ::gid_t) -> ::c_int;
        pub fn fchownat(
            dirfd: ::c_int,
            pathname: *const ::c_char,
            owner: ::uid_t,
            group: ::gid_t,
            flags: ::c_int,
        ) -> ::c_int;
        #[cfg_attr(target_os = "macos", link_name = "fstatat$INODE64")]
        #[cfg_attr(
            all(target_os = "freebsd", any(freebsd11, freebsd10)),
            link_name = "fstatat@FBSD_1.1"
        )]
        pub fn fstatat(
            dirfd: ::c_int,
            pathname: *const ::c_char,
            buf: *mut stat,
            flags: ::c_int,
        ) -> ::c_int;
        pub fn linkat(
            olddirfd: ::c_int,
            oldpath: *const ::c_char,
            newdirfd: ::c_int,
            newpath: *const ::c_char,
            flags: ::c_int,
        ) -> ::c_int;
        pub fn renameat(
            olddirfd: ::c_int,
            oldpath: *const ::c_char,
            newdirfd: ::c_int,
            newpath: *const ::c_char,
        ) -> ::c_int;
        pub fn symlinkat(
            target: *const ::c_char,
            newdirfd: ::c_int,
            linkpath: *const ::c_char,
        ) -> ::c_int;
        pub fn unlinkat(
            dirfd: ::c_int,
            pathname: *const ::c_char,
            flags: ::c_int,
        ) -> ::c_int;

        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 fchdir(dirfd: ::c_int) -> ::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 = "lchown$UNIX2003"
        )]
        pub fn lchown(path: *const c_char, uid: uid_t, gid: gid_t) -> ::c_int;
        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86"),
            link_name = "close$NOCANCEL$UNIX2003"
        )]
        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86_64"),
            link_name = "close$NOCANCEL"
        )]
        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 execl(path: *const c_char, arg0: *const c_char, ...) -> ::c_int;
        pub fn execle(
            path: *const ::c_char,
            arg0: *const ::c_char,
            ...
        ) -> ::c_int;
        pub fn execlp(
            file: *const ::c_char,
            arg0: *const ::c_char,
            ...
        ) -> ::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$UNIX2003"
        )]
        pub fn getopt(
            argc: ::c_int,
            argv: *const *mut c_char,
            optstr: *const c_char,
        ) -> ::c_int;
        pub fn getpgid(pid: pid_t) -> pid_t;
        pub fn getpgrp() -> pid_t;
        pub fn getpid() -> pid_t;
        pub fn getppid() -> pid_t;
        pub fn getuid() -> uid_t;
        pub fn isatty(fd: ::c_int) -> ::c_int;
        pub fn link(src: *const c_char, dst: *const c_char) -> ::c_int;
        pub fn lseek(fd: ::c_int, offset: off_t, whence: ::c_int) -> off_t;
        pub fn pathconf(path: *const c_char, name: ::c_int) -> c_long;
        pub fn pipe(fds: *mut ::c_int) -> ::c_int;
        pub fn posix_memalign(
            memptr: *mut *mut ::c_void,
            align: ::size_t,
            size: ::size_t,
        ) -> ::c_int;
        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86"),
            link_name = "read$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 seteuid(uid: uid_t) -> ::c_int;
        pub fn setegid(gid: gid_t) -> ::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 tcsetpgrp(fd: ::c_int, pgrp: ::pid_t) -> ::c_int;
        pub fn ttyname(fd: ::c_int) -> *mut c_char;
        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86"),
            link_name = "ttyname_r$UNIX2003"
        )]
        pub fn ttyname_r(
            fd: ::c_int,
            buf: *mut c_char,
            buflen: ::size_t,
        ) -> ::c_int;
        pub fn unlink(c: *const c_char) -> ::c_int;
        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86"),
            link_name = "wait$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$UNIX2003"
        )]
        pub fn kill(pid: pid_t, sig: ::c_int) -> ::c_int;
        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86"),
            link_name = "killpg$UNIX2003"
        )]
        pub fn killpg(pgrp: 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;
        pub fn if_indextoname(
            ifindex: ::c_uint,
            ifname: *mut ::c_char,
        ) -> *mut ::c_char;

        #[cfg_attr(target_os = "macos", link_name = "lstat$INODE64")]
        #[cfg_attr(target_os = "netbsd", link_name = "__lstat50")]
        #[cfg_attr(
            all(target_os = "freebsd", any(freebsd11, freebsd10)),
            link_name = "lstat@FBSD_1.0"
        )]
        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;

        pub fn signal(signum: ::c_int, handler: sighandler_t) -> sighandler_t;

        #[cfg_attr(target_os = "netbsd", link_name = "__getrusage50")]
        pub fn getrusage(resource: ::c_int, usage: *mut rusage) -> ::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(target_os = "netbsd", link_name = "__times13")]
        pub fn times(buf: *mut ::tms) -> ::clock_t;

        pub fn pthread_self() -> ::pthread_t;
        #[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_exit(value: *mut ::c_void) -> !;
        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: ::Option<unsafe extern "C" 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_init$UNIX2003"
        )]
        pub fn pthread_cond_init(
            cond: *mut pthread_cond_t,
            attr: *const pthread_condattr_t,
        ) -> ::c_int;
        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86"),
            link_name = "pthread_cond_wait$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$UNIX2003"
        )]
        pub fn pthread_cond_timedwait(
            cond: *mut pthread_cond_t,
            lock: *mut pthread_mutex_t,
            abstime: *const ::timespec,
        ) -> ::c_int;
        pub fn pthread_cond_signal(cond: *mut pthread_cond_t) -> ::c_int;
        pub fn pthread_cond_broadcast(cond: *mut pthread_cond_t) -> ::c_int;
        pub fn pthread_cond_destroy(cond: *mut pthread_cond_t) -> ::c_int;
        pub fn pthread_condattr_init(attr: *mut pthread_condattr_t) -> ::c_int;
        pub fn pthread_condattr_destroy(attr: *mut pthread_condattr_t) -> ::c_int;
        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86"),
            link_name = "pthread_rwlock_init$UNIX2003"
        )]
        pub fn pthread_rwlock_init(
            lock: *mut pthread_rwlock_t,
            attr: *const pthread_rwlockattr_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;
        pub fn pthread_rwlockattr_init(attr: *mut pthread_rwlockattr_t)
            -> ::c_int;
        pub fn pthread_rwlockattr_destroy(
            attr: *mut pthread_rwlockattr_t,
        ) -> ::c_int;

        #[cfg_attr(target_os = "illumos", link_name = "__xnet_getsockopt")]
        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;
        #[cfg_attr(target_os = "netbsd", link_name = "__sigaction14")]
        pub fn sigaction(
            signum: ::c_int,
            act: *const sigaction,
            oldact: *mut sigaction,
        ) -> ::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(
            any(
                all(target_os = "linux", not(target_env = "musl")),
                target_os = "freebsd",
                target_os = "dragonfly",
                target_os = "haiku"
            ),
            link_name = "__res_init"
        )]
        #[cfg_attr(
            any(target_os = "macos", target_os = "ios"),
            link_name = "res_9_init"
        )]
        pub fn res_init() -> ::c_int;

        #[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 = "__time50")]
        pub fn time(time: *mut time_t) -> time_t;
        #[cfg_attr(target_os = "netbsd", link_name = "__gmtime50")]
        pub fn gmtime(time_p: *const time_t) -> *mut tm;
        #[cfg_attr(target_os = "netbsd", link_name = "__locatime50")]
        pub fn localtime(time_p: *const time_t) -> *mut tm;
        #[cfg_attr(target_os = "netbsd", link_name = "__difftime50")]
        pub fn difftime(time1: time_t, time0: time_t) -> ::c_double;

        #[cfg_attr(target_os = "netbsd", link_name = "__mknod50")]
        #[cfg_attr(
            all(target_os = "freebsd", any(freebsd11, freebsd10)),
            link_name = "mknod@FBSD_1.0"
        )]
        pub fn mknod(
            pathname: *const ::c_char,
            mode: ::mode_t,
            dev: ::dev_t,
        ) -> ::c_int;
        pub fn gethostname(name: *mut ::c_char, len: ::size_t) -> ::c_int;
        pub fn getservbyname(
            name: *const ::c_char,
            proto: *const ::c_char,
        ) -> *mut servent;
        pub fn getprotobyname(name: *const ::c_char) -> *mut protoent;
        pub fn getprotobynumber(proto: ::c_int) -> *mut protoent;
        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 = "poll$UNIX2003"
        )]
        pub fn poll(fds: *mut pollfd, nfds: nfds_t, timeout: ::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(target_os = "netbsd", link_name = "__setlocale50")]
        pub fn setlocale(
            category: ::c_int,
            locale: *const ::c_char,
        ) -> *mut ::c_char;
        pub fn localeconv() -> *mut lconv;

        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86"),
            link_name = "sem_wait$UNIX2003"
        )]
        pub fn sem_wait(sem: *mut sem_t) -> ::c_int;
        pub fn sem_trywait(sem: *mut sem_t) -> ::c_int;
        pub fn sem_post(sem: *mut sem_t) -> ::c_int;
        pub fn statvfs(path: *const c_char, buf: *mut statvfs) -> ::c_int;
        pub fn fstatvfs(fd: ::c_int, buf: *mut statvfs) -> ::c_int;

        pub fn readlink(
            path: *const c_char,
            buf: *mut c_char,
            bufsz: ::size_t,
        ) -> ::ssize_t;

        #[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(target_os = "netbsd", link_name = "__sigprocmask14")]
        pub fn sigprocmask(
            how: ::c_int,
            set: *const sigset_t,
            oldset: *mut sigset_t,
        ) -> ::c_int;
        #[cfg_attr(target_os = "netbsd", link_name = "__sigpending14")]
        pub fn sigpending(set: *mut sigset_t) -> ::c_int;

        #[cfg_attr(target_os = "netbsd", link_name = "__timegm50")]
        pub fn timegm(tm: *mut ::tm) -> time_t;

        pub fn sysconf(name: ::c_int) -> ::c_long;

        pub fn mkfifo(path: *const c_char, mode: mode_t) -> ::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(
            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 tcgetsid(fd: ::c_int) -> ::pid_t;
        pub fn tcsendbreak(fd: ::c_int, duration: ::c_int) -> ::c_int;
        pub fn mkstemp(template: *mut ::c_char) -> ::c_int;
        pub fn mkdtemp(template: *mut ::c_char) -> *mut ::c_char;

        pub fn tmpnam(ptr: *mut ::c_char) -> *mut ::c_char;

        pub fn openlog(ident: *const ::c_char, logopt: ::c_int, facility: ::c_int);
        pub fn closelog();
        pub fn setlogmask(maskpri: ::c_int) -> ::c_int;
        #[cfg_attr(target_os = "macos", link_name = "syslog$DARWIN_EXTSN")]
        pub fn syslog(priority: ::c_int, message: *const ::c_char, ...);
        #[cfg_attr(
            all(target_os = "macos", target_arch = "x86"),
            link_name = "nice$UNIX2003"
        )]
        pub fn nice(incr: ::c_int) -> ::c_int;

        pub fn grantpt(fd: ::c_int) -> ::c_int;
        pub fn posix_openpt(flags: ::c_int) -> ::c_int;
        pub fn ptsname(fd: ::c_int) -> *mut ::c_char;
        pub fn unlockpt(fd: ::c_int) -> ::c_int;

        pub fn strcasestr(cs: *const c_char, ct: *const c_char) -> *mut c_char;
        pub fn getline(
            lineptr: *mut *mut c_char,
            n: *mut size_t,
            stream: *mut FILE,
        ) -> ssize_t;
    }

    cfg_if! {
        if #[cfg(not(target_os = "redox"))] {
            extern {
                pub fn getsid(pid: pid_t) -> pid_t;
                pub fn truncate(path: *const c_char, length: off_t) -> ::c_int;
                #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                           link_name = "pause$UNIX2003")]
                pub fn pause() -> ::c_int;

                pub fn readlinkat(dirfd: ::c_int,
                                  pathname: *const ::c_char,
                                  buf: *mut ::c_char,
                                  bufsiz: ::size_t) -> ::ssize_t;
                pub fn mkdirat(dirfd: ::c_int, pathname: *const ::c_char,
                               mode: ::mode_t) -> ::c_int;
                pub fn openat(dirfd: ::c_int, pathname: *const ::c_char,
                              flags: ::c_int, ...) -> ::c_int;

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

                #[cfg_attr(target_os = "macos", link_name = "readdir_r$INODE64")]
                #[cfg_attr(target_os = "netbsd", link_name = "__readdir_r30")]
                #[cfg_attr(
                    all(target_os = "freebsd", any(freebsd11, freebsd10)),
                    link_name = "readdir_r@FBSD_1.0"
                )]
                /// The 64-bit libc on Solaris and illumos only has readdir_r.  If a
                /// 32-bit Solaris or illumos target is ever created, it should use
                /// __posix_readdir_r.  See libc(3LIB) on Solaris or illumos:
                /// https://illumos.org/man/3lib/libc
                /// https://docs.oracle.com/cd/E36784_01/html/E36873/libc-3lib.html
                /// https://www.unix.com/man-page/opensolaris/3LIB/libc/
                pub fn readdir_r(dirp: *mut ::DIR, entry: *mut ::dirent,
                                 result: *mut *mut ::dirent) -> ::c_int;
            }
        }
    }

    cfg_if! {
       if #[cfg(not(any(target_os = "solaris", target_os = "illumos")))] {
            extern {
                pub fn cfmakeraw(termios: *mut ::termios);
                pub fn cfsetspeed(termios: *mut ::termios,
                                  speed: ::speed_t) -> ::c_int;
            }
       }
    }

    cfg_if! {
        if #[cfg(target_env = "uclibc")] {
            mod uclibc;
            pub use self::uclibc::*;
        } else if #[cfg(target_env = "newlib")] {
            mod newlib;
            pub use self::newlib::*;
        } else if #[cfg(any(target_os = "linux",
                            target_os = "android",
                            target_os = "emscripten"))] {
            mod linux_like;
            pub use self::linux_like::*;
        } else if #[cfg(any(target_os = "macos",
                            target_os = "ios",
                            target_os = "freebsd",
                            target_os = "dragonfly",
                            target_os = "openbsd",
                            target_os = "netbsd"))] {
            mod bsd;
            pub use self::bsd::*;
        } else if #[cfg(any(target_os = "solaris",
                            target_os = "illumos"))] {
            mod solarish;
            pub use self::solarish::*;
        } else if #[cfg(target_os = "haiku")] {
            mod haiku;
            pub use self::haiku::*;
        } else if #[cfg(target_os = "hermit")] {
            mod hermit;
            pub use self::hermit::*;
        } else if #[cfg(target_os = "redox")] {
            mod redox;
            pub use self::redox::*;
        } else {
            // Unknown target_os
        }
    }

    cfg_if! {
        if #[cfg(libc_core_cvoid)] {
            pub use ::ffi::c_void;
        } else {
            // Use repr(u8) as LLVM expects `void*` to be the same as `i8*` to help
            // enable more optimization opportunities around it recognizing things
            // like malloc/free.
            #[repr(u8)]
            #[allow(missing_copy_implementations)]
            #[allow(missing_debug_implementations)]
            pub enum c_void {
                // Two dummy variants so the #[repr] attribute can be used.
                #[doc(hidden)]
                __variant1,
                #[doc(hidden)]
                __variant2,
            }
        }
    }

    cfg_if! {
        if #[cfg(libc_align)] {
            mod align;
            pub use self::align::*;
        } else {
            mod no_align;
            pub use self::no_align::*;
        }
    }

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