xref: /rust-libc-0.2.174/src/unix/mod.rs (revision b484a8d9)
1 //! Definitions found commonly among almost all Unix derivatives
2 //!
3 //! More functions and definitions can be found in the more specific modules
4 //! according to the platform in question.
5 
6 pub type c_schar = i8;
7 pub type c_uchar = u8;
8 pub type c_short = i16;
9 pub type c_ushort = u16;
10 pub type c_int = i32;
11 pub type c_uint = u32;
12 pub type c_float = f32;
13 pub type c_double = f64;
14 pub type c_longlong = i64;
15 pub type c_ulonglong = u64;
16 pub type intmax_t = i64;
17 pub type uintmax_t = u64;
18 
19 pub type size_t = usize;
20 pub type ptrdiff_t = isize;
21 pub type intptr_t = isize;
22 pub type uintptr_t = usize;
23 pub type ssize_t = isize;
24 
25 pub type pid_t = i32;
26 pub type in_addr_t = u32;
27 pub type in_port_t = u16;
28 pub type sighandler_t = ::size_t;
29 pub type cc_t = ::c_uchar;
30 
31 cfg_if! {
32     if #[cfg(any(target_os = "espidf", target_os = "horizon"))] {
33         pub type uid_t = ::c_ushort;
34         pub type gid_t = ::c_ushort;
35     } else {
36         pub type uid_t = u32;
37         pub type gid_t = u32;
38     }
39 }
40 
41 #[cfg_attr(feature = "extra_traits", derive(Debug))]
42 pub enum DIR {}
43 impl ::Copy for DIR {}
44 impl ::Clone for DIR {
45     fn clone(&self) -> DIR {
46         *self
47     }
48 }
49 pub type locale_t = *mut ::c_void;
50 
51 s! {
52     pub struct group {
53         pub gr_name: *mut ::c_char,
54         pub gr_passwd: *mut ::c_char,
55         pub gr_gid: ::gid_t,
56         pub gr_mem: *mut *mut ::c_char,
57     }
58 
59     pub struct utimbuf {
60         pub actime: time_t,
61         pub modtime: time_t,
62     }
63 
64     pub struct timeval {
65         pub tv_sec: time_t,
66         pub tv_usec: suseconds_t,
67     }
68 
69     // linux x32 compatibility
70     // See https://sourceware.org/bugzilla/show_bug.cgi?id=16437
71     pub struct timespec {
72         pub tv_sec: time_t,
73         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
74         pub tv_nsec: i64,
75         #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
76         pub tv_nsec: ::c_long,
77     }
78 
79     pub struct rlimit {
80         pub rlim_cur: rlim_t,
81         pub rlim_max: rlim_t,
82     }
83 
84     pub struct rusage {
85         pub ru_utime: timeval,
86         pub ru_stime: timeval,
87         pub ru_maxrss: c_long,
88         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
89         __pad1: u32,
90         pub ru_ixrss: c_long,
91         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
92         __pad2: u32,
93         pub ru_idrss: c_long,
94         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
95         __pad3: u32,
96         pub ru_isrss: c_long,
97         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
98         __pad4: u32,
99         pub ru_minflt: c_long,
100         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
101         __pad5: u32,
102         pub ru_majflt: c_long,
103         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
104         __pad6: u32,
105         pub ru_nswap: c_long,
106         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
107         __pad7: u32,
108         pub ru_inblock: c_long,
109         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
110         __pad8: u32,
111         pub ru_oublock: c_long,
112         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
113         __pad9: u32,
114         pub ru_msgsnd: c_long,
115         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
116         __pad10: u32,
117         pub ru_msgrcv: c_long,
118         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
119         __pad11: u32,
120         pub ru_nsignals: c_long,
121         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
122         __pad12: u32,
123         pub ru_nvcsw: c_long,
124         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
125         __pad13: u32,
126         pub ru_nivcsw: c_long,
127         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
128         __pad14: u32,
129 
130         #[cfg(any(target_env = "musl", target_os = "emscripten"))]
131         __reserved: [c_long; 16],
132     }
133 
134     pub struct ipv6_mreq {
135         pub ipv6mr_multiaddr: in6_addr,
136         #[cfg(target_os = "android")]
137         pub ipv6mr_interface: ::c_int,
138         #[cfg(not(target_os = "android"))]
139         pub ipv6mr_interface: ::c_uint,
140     }
141 
142     pub struct hostent {
143         pub h_name: *mut ::c_char,
144         pub h_aliases: *mut *mut ::c_char,
145         pub h_addrtype: ::c_int,
146         pub h_length: ::c_int,
147         pub h_addr_list: *mut *mut ::c_char,
148     }
149 
150     pub struct iovec {
151         pub iov_base: *mut ::c_void,
152         pub iov_len: ::size_t,
153     }
154 
155     pub struct pollfd {
156         pub fd: ::c_int,
157         pub events: ::c_short,
158         pub revents: ::c_short,
159     }
160 
161     pub struct winsize {
162         pub ws_row: ::c_ushort,
163         pub ws_col: ::c_ushort,
164         pub ws_xpixel: ::c_ushort,
165         pub ws_ypixel: ::c_ushort,
166     }
167 
168     pub struct linger {
169         pub l_onoff: ::c_int,
170         pub l_linger: ::c_int,
171     }
172 
173     pub struct sigval {
174         // Actually a union of an int and a void*
175         pub sival_ptr: *mut ::c_void
176     }
177 
178     // <sys/time.h>
179     pub struct itimerval {
180         pub it_interval: ::timeval,
181         pub it_value: ::timeval,
182     }
183 
184     // <sys/times.h>
185     pub struct tms {
186         pub tms_utime: ::clock_t,
187         pub tms_stime: ::clock_t,
188         pub tms_cutime: ::clock_t,
189         pub tms_cstime: ::clock_t,
190     }
191 
192     pub struct servent {
193         pub s_name: *mut ::c_char,
194         pub s_aliases: *mut *mut ::c_char,
195         pub s_port: ::c_int,
196         pub s_proto: *mut ::c_char,
197     }
198 
199     pub struct protoent {
200         pub p_name: *mut ::c_char,
201         pub p_aliases: *mut *mut ::c_char,
202         pub p_proto: ::c_int,
203     }
204 }
205 
206 pub const INT_MIN: c_int = -2147483648;
207 pub const INT_MAX: c_int = 2147483647;
208 
209 pub const SIG_DFL: sighandler_t = 0 as sighandler_t;
210 pub const SIG_IGN: sighandler_t = 1 as sighandler_t;
211 pub const SIG_ERR: sighandler_t = !0 as sighandler_t;
212 
213 pub const DT_UNKNOWN: u8 = 0;
214 pub const DT_FIFO: u8 = 1;
215 pub const DT_CHR: u8 = 2;
216 pub const DT_DIR: u8 = 4;
217 pub const DT_BLK: u8 = 6;
218 pub const DT_REG: u8 = 8;
219 pub const DT_LNK: u8 = 10;
220 pub const DT_SOCK: u8 = 12;
221 
222 cfg_if! {
223     if #[cfg(not(target_os = "redox"))] {
224         pub const FD_CLOEXEC: ::c_int = 0x1;
225     }
226 }
227 
228 pub const USRQUOTA: ::c_int = 0;
229 pub const GRPQUOTA: ::c_int = 1;
230 
231 pub const SIGIOT: ::c_int = 6;
232 
233 pub const S_ISUID: ::mode_t = 0x800;
234 pub const S_ISGID: ::mode_t = 0x400;
235 pub const S_ISVTX: ::mode_t = 0x200;
236 
237 cfg_if! {
238     if #[cfg(not(any(target_os = "haiku", target_os = "illumos",
239                      target_os = "solaris")))] {
240         pub const IF_NAMESIZE: ::size_t = 16;
241         pub const IFNAMSIZ: ::size_t = IF_NAMESIZE;
242     }
243 }
244 
245 pub const LOG_EMERG: ::c_int = 0;
246 pub const LOG_ALERT: ::c_int = 1;
247 pub const LOG_CRIT: ::c_int = 2;
248 pub const LOG_ERR: ::c_int = 3;
249 pub const LOG_WARNING: ::c_int = 4;
250 pub const LOG_NOTICE: ::c_int = 5;
251 pub const LOG_INFO: ::c_int = 6;
252 pub const LOG_DEBUG: ::c_int = 7;
253 
254 pub const LOG_KERN: ::c_int = 0;
255 pub const LOG_USER: ::c_int = 1 << 3;
256 pub const LOG_MAIL: ::c_int = 2 << 3;
257 pub const LOG_DAEMON: ::c_int = 3 << 3;
258 pub const LOG_AUTH: ::c_int = 4 << 3;
259 pub const LOG_SYSLOG: ::c_int = 5 << 3;
260 pub const LOG_LPR: ::c_int = 6 << 3;
261 pub const LOG_NEWS: ::c_int = 7 << 3;
262 pub const LOG_UUCP: ::c_int = 8 << 3;
263 pub const LOG_LOCAL0: ::c_int = 16 << 3;
264 pub const LOG_LOCAL1: ::c_int = 17 << 3;
265 pub const LOG_LOCAL2: ::c_int = 18 << 3;
266 pub const LOG_LOCAL3: ::c_int = 19 << 3;
267 pub const LOG_LOCAL4: ::c_int = 20 << 3;
268 pub const LOG_LOCAL5: ::c_int = 21 << 3;
269 pub const LOG_LOCAL6: ::c_int = 22 << 3;
270 pub const LOG_LOCAL7: ::c_int = 23 << 3;
271 
272 cfg_if! {
273     if #[cfg(not(target_os = "haiku"))] {
274         pub const LOG_PID: ::c_int = 0x01;
275         pub const LOG_CONS: ::c_int = 0x02;
276         pub const LOG_ODELAY: ::c_int = 0x04;
277         pub const LOG_NDELAY: ::c_int = 0x08;
278         pub const LOG_NOWAIT: ::c_int = 0x10;
279     }
280 }
281 pub const LOG_PRIMASK: ::c_int = 7;
282 pub const LOG_FACMASK: ::c_int = 0x3f8;
283 
284 pub const PRIO_MIN: ::c_int = -20;
285 pub const PRIO_MAX: ::c_int = 20;
286 
287 pub const IPPROTO_ICMP: ::c_int = 1;
288 pub const IPPROTO_ICMPV6: ::c_int = 58;
289 pub const IPPROTO_TCP: ::c_int = 6;
290 pub const IPPROTO_UDP: ::c_int = 17;
291 pub const IPPROTO_IP: ::c_int = 0;
292 pub const IPPROTO_IPV6: ::c_int = 41;
293 
294 pub const INADDR_LOOPBACK: in_addr_t = 2130706433;
295 pub const INADDR_ANY: in_addr_t = 0;
296 pub const INADDR_BROADCAST: in_addr_t = 4294967295;
297 pub const INADDR_NONE: in_addr_t = 4294967295;
298 
299 pub const ARPOP_REQUEST: u16 = 1;
300 pub const ARPOP_REPLY: u16 = 2;
301 
302 pub const ATF_COM: ::c_int = 0x02;
303 pub const ATF_PERM: ::c_int = 0x04;
304 pub const ATF_PUBL: ::c_int = 0x08;
305 pub const ATF_USETRAILERS: ::c_int = 0x10;
306 
307 cfg_if! {
308     if #[cfg(any(target_os = "l4re", target_os = "espidf"))] {
309         // required libraries for L4Re and the ESP-IDF framework are linked externally, ATM
310     } else if #[cfg(feature = "std")] {
311         // cargo build, don't pull in anything extra as the libstd dep
312         // already pulls in all libs.
313     } else if #[cfg(all(target_os = "linux",
314                         any(target_env = "gnu", target_env = "uclibc"),
315                         feature = "rustc-dep-of-std"))] {
316         #[link(name = "util", kind = "static", modifiers = "-bundle",
317             cfg(target_feature = "crt-static"))]
318         #[link(name = "rt", kind = "static", modifiers = "-bundle",
319             cfg(target_feature = "crt-static"))]
320         #[link(name = "pthread", kind = "static", modifiers = "-bundle",
321             cfg(target_feature = "crt-static"))]
322         #[link(name = "m", kind = "static", modifiers = "-bundle",
323             cfg(target_feature = "crt-static"))]
324         #[link(name = "dl", kind = "static", modifiers = "-bundle",
325             cfg(target_feature = "crt-static"))]
326         #[link(name = "c", kind = "static", modifiers = "-bundle",
327             cfg(target_feature = "crt-static"))]
328         #[link(name = "gcc_eh", kind = "static", modifiers = "-bundle",
329             cfg(target_feature = "crt-static"))]
330         #[link(name = "gcc", kind = "static", modifiers = "-bundle",
331             cfg(target_feature = "crt-static"))]
332         #[link(name = "util", cfg(not(target_feature = "crt-static")))]
333         #[link(name = "rt", cfg(not(target_feature = "crt-static")))]
334         #[link(name = "pthread", cfg(not(target_feature = "crt-static")))]
335         #[link(name = "m", cfg(not(target_feature = "crt-static")))]
336         #[link(name = "dl", cfg(not(target_feature = "crt-static")))]
337         #[link(name = "c", cfg(not(target_feature = "crt-static")))]
338         extern {}
339     } else if #[cfg(target_env = "musl")] {
340         #[cfg_attr(feature = "rustc-dep-of-std",
341                    link(name = "c", kind = "static", modifiers = "-bundle",
342                         cfg(target_feature = "crt-static")))]
343         #[cfg_attr(feature = "rustc-dep-of-std",
344                    link(name = "c", cfg(not(target_feature = "crt-static"))))]
345         extern {}
346     } else if #[cfg(target_os = "emscripten")] {
347         #[link(name = "c")]
348         extern {}
349     } else if #[cfg(all(target_os = "netbsd",
350                         feature = "rustc-dep-of-std",
351                         target_vendor = "rumprun"))] {
352         // Since we don't use -nodefaultlibs on Rumprun, libc is always pulled
353         // in automatically by the linker. We avoid passing it explicitly, as it
354         // causes some versions of binutils to crash with an assertion failure.
355         #[link(name = "m")]
356         extern {}
357     } else if #[cfg(any(target_os = "macos",
358                         target_os = "ios",
359                         target_os = "watchos",
360                         target_os = "android",
361                         target_os = "openbsd"))] {
362         #[link(name = "c")]
363         #[link(name = "m")]
364         extern {}
365     } else if #[cfg(target_os = "haiku")] {
366         #[link(name = "root")]
367         #[link(name = "network")]
368         extern {}
369     } else if #[cfg(target_env = "newlib")] {
370         #[link(name = "c")]
371         #[link(name = "m")]
372         extern {}
373     } else if #[cfg(target_os = "hermit")] {
374         // no_default_libraries is set to false for HermitCore, so only a link
375         // to "pthread" needs to be added.
376         #[link(name = "pthread")]
377         extern {}
378     } else if #[cfg(target_env = "illumos")] {
379         #[link(name = "c")]
380         #[link(name = "m")]
381         extern {}
382     } else if #[cfg(target_os = "redox")] {
383         #[cfg_attr(feature = "rustc-dep-of-std",
384                    link(name = "c", kind = "static", modifiers = "-bundle",
385                         cfg(target_feature = "crt-static")))]
386         #[cfg_attr(feature = "rustc-dep-of-std",
387                    link(name = "c", cfg(not(target_feature = "crt-static"))))]
388         extern {}
389     } else {
390         #[link(name = "c")]
391         #[link(name = "m")]
392         #[link(name = "rt")]
393         #[link(name = "pthread")]
394         extern {}
395     }
396 }
397 
398 #[cfg_attr(feature = "extra_traits", derive(Debug))]
399 pub enum FILE {}
400 impl ::Copy for FILE {}
401 impl ::Clone for FILE {
402     fn clone(&self) -> FILE {
403         *self
404     }
405 }
406 #[cfg_attr(feature = "extra_traits", derive(Debug))]
407 pub enum fpos_t {} // FIXME: fill this out with a struct
408 impl ::Copy for fpos_t {}
409 impl ::Clone for fpos_t {
410     fn clone(&self) -> fpos_t {
411         *self
412     }
413 }
414 
415 extern "C" {
416     pub fn isalnum(c: c_int) -> c_int;
417     pub fn isalpha(c: c_int) -> c_int;
418     pub fn iscntrl(c: c_int) -> c_int;
419     pub fn isdigit(c: c_int) -> c_int;
420     pub fn isgraph(c: c_int) -> c_int;
421     pub fn islower(c: c_int) -> c_int;
422     pub fn isprint(c: c_int) -> c_int;
423     pub fn ispunct(c: c_int) -> c_int;
424     pub fn isspace(c: c_int) -> c_int;
425     pub fn isupper(c: c_int) -> c_int;
426     pub fn isxdigit(c: c_int) -> c_int;
427     pub fn isblank(c: c_int) -> c_int;
428     pub fn tolower(c: c_int) -> c_int;
429     pub fn toupper(c: c_int) -> c_int;
430     pub fn qsort(
431         base: *mut c_void,
432         num: size_t,
433         size: size_t,
434         compar: ::Option<unsafe extern "C" fn(*const c_void, *const c_void) -> c_int>,
435     );
436     pub fn bsearch(
437         key: *const c_void,
438         base: *const c_void,
439         num: size_t,
440         size: size_t,
441         compar: ::Option<unsafe extern "C" fn(*const c_void, *const c_void) -> c_int>,
442     ) -> *mut c_void;
443     #[cfg_attr(
444         all(target_os = "macos", target_arch = "x86"),
445         link_name = "fopen$UNIX2003"
446     )]
447     pub fn fopen(filename: *const c_char, mode: *const c_char) -> *mut FILE;
448     #[cfg_attr(
449         all(target_os = "macos", target_arch = "x86"),
450         link_name = "freopen$UNIX2003"
451     )]
452     pub fn freopen(filename: *const c_char, mode: *const c_char, file: *mut FILE) -> *mut FILE;
453     pub fn fmemopen(buf: *mut c_void, size: size_t, mode: *const c_char) -> *mut FILE;
454     pub fn open_memstream(ptr: *mut *mut c_char, sizeloc: *mut size_t) -> *mut FILE;
455 
456     pub fn fflush(file: *mut FILE) -> c_int;
457     pub fn fclose(file: *mut FILE) -> c_int;
458     pub fn remove(filename: *const c_char) -> c_int;
459     pub fn rename(oldname: *const c_char, newname: *const c_char) -> c_int;
460     pub fn tmpfile() -> *mut FILE;
461     pub fn setvbuf(stream: *mut FILE, buffer: *mut c_char, mode: c_int, size: size_t) -> c_int;
462     pub fn setbuf(stream: *mut FILE, buf: *mut c_char);
463     pub fn getchar() -> c_int;
464     pub fn putchar(c: c_int) -> c_int;
465     pub fn fgetc(stream: *mut FILE) -> c_int;
466     pub fn fgets(buf: *mut c_char, n: c_int, stream: *mut FILE) -> *mut c_char;
467     pub fn fputc(c: c_int, stream: *mut FILE) -> c_int;
468     #[cfg_attr(
469         all(target_os = "macos", target_arch = "x86"),
470         link_name = "fputs$UNIX2003"
471     )]
472     pub fn fputs(s: *const c_char, stream: *mut FILE) -> c_int;
473     pub fn puts(s: *const c_char) -> c_int;
474     pub fn ungetc(c: c_int, stream: *mut FILE) -> c_int;
475     pub fn fread(ptr: *mut c_void, size: size_t, nobj: size_t, stream: *mut FILE) -> size_t;
476     #[cfg_attr(
477         all(target_os = "macos", target_arch = "x86"),
478         link_name = "fwrite$UNIX2003"
479     )]
480     pub fn fwrite(ptr: *const c_void, size: size_t, nobj: size_t, stream: *mut FILE) -> size_t;
481     pub fn fseek(stream: *mut FILE, offset: c_long, whence: c_int) -> c_int;
482     pub fn ftell(stream: *mut FILE) -> c_long;
483     pub fn rewind(stream: *mut FILE);
484     #[cfg_attr(target_os = "netbsd", link_name = "__fgetpos50")]
485     pub fn fgetpos(stream: *mut FILE, ptr: *mut fpos_t) -> c_int;
486     #[cfg_attr(target_os = "netbsd", link_name = "__fsetpos50")]
487     pub fn fsetpos(stream: *mut FILE, ptr: *const fpos_t) -> c_int;
488     pub fn feof(stream: *mut FILE) -> c_int;
489     pub fn ferror(stream: *mut FILE) -> c_int;
490     pub fn clearerr(stream: *mut FILE);
491     pub fn perror(s: *const c_char);
492     pub fn atoi(s: *const c_char) -> c_int;
493     #[cfg_attr(
494         all(target_os = "macos", target_arch = "x86"),
495         link_name = "strtod$UNIX2003"
496     )]
497     pub fn strtod(s: *const c_char, endp: *mut *mut c_char) -> c_double;
498     pub fn strtof(s: *const c_char, endp: *mut *mut c_char) -> c_float;
499     pub fn strtol(s: *const c_char, endp: *mut *mut c_char, base: c_int) -> c_long;
500     pub fn strtoul(s: *const c_char, endp: *mut *mut c_char, base: c_int) -> c_ulong;
501     pub fn calloc(nobj: size_t, size: size_t) -> *mut c_void;
502     pub fn malloc(size: size_t) -> *mut c_void;
503     pub fn realloc(p: *mut c_void, size: size_t) -> *mut c_void;
504     pub fn free(p: *mut c_void);
505     pub fn abort() -> !;
506     pub fn exit(status: c_int) -> !;
507     pub fn _exit(status: c_int) -> !;
508     pub fn atexit(cb: extern "C" fn()) -> c_int;
509     #[cfg_attr(
510         all(target_os = "macos", target_arch = "x86"),
511         link_name = "system$UNIX2003"
512     )]
513     pub fn system(s: *const c_char) -> c_int;
514     pub fn getenv(s: *const c_char) -> *mut c_char;
515 
516     pub fn strcpy(dst: *mut c_char, src: *const c_char) -> *mut c_char;
517     pub fn strncpy(dst: *mut c_char, src: *const c_char, n: size_t) -> *mut c_char;
518     pub fn strcat(s: *mut c_char, ct: *const c_char) -> *mut c_char;
519     pub fn strncat(s: *mut c_char, ct: *const c_char, n: size_t) -> *mut c_char;
520     pub fn strcmp(cs: *const c_char, ct: *const c_char) -> c_int;
521     pub fn strncmp(cs: *const c_char, ct: *const c_char, n: size_t) -> c_int;
522     pub fn strcoll(cs: *const c_char, ct: *const c_char) -> c_int;
523     pub fn strchr(cs: *const c_char, c: c_int) -> *mut c_char;
524     pub fn strrchr(cs: *const c_char, c: c_int) -> *mut c_char;
525     pub fn strspn(cs: *const c_char, ct: *const c_char) -> size_t;
526     pub fn strcspn(cs: *const c_char, ct: *const c_char) -> size_t;
527     pub fn strdup(cs: *const c_char) -> *mut c_char;
528     pub fn strndup(cs: *const c_char, n: size_t) -> *mut c_char;
529     pub fn strpbrk(cs: *const c_char, ct: *const c_char) -> *mut c_char;
530     pub fn strstr(cs: *const c_char, ct: *const c_char) -> *mut c_char;
531     pub fn strcasecmp(s1: *const c_char, s2: *const c_char) -> c_int;
532     pub fn strncasecmp(s1: *const c_char, s2: *const c_char, n: size_t) -> c_int;
533     pub fn strlen(cs: *const c_char) -> size_t;
534     pub fn strnlen(cs: *const c_char, maxlen: size_t) -> size_t;
535     #[cfg_attr(
536         all(target_os = "macos", target_arch = "x86"),
537         link_name = "strerror$UNIX2003"
538     )]
539     pub fn strerror(n: c_int) -> *mut c_char;
540     pub fn strtok(s: *mut c_char, t: *const c_char) -> *mut c_char;
541     pub fn strxfrm(s: *mut c_char, ct: *const c_char, n: size_t) -> size_t;
542     pub fn strsignal(sig: c_int) -> *mut c_char;
543     pub fn wcslen(buf: *const wchar_t) -> size_t;
544     pub fn wcstombs(dest: *mut c_char, src: *const wchar_t, n: size_t) -> ::size_t;
545 
546     pub fn memchr(cx: *const c_void, c: c_int, n: size_t) -> *mut c_void;
547     pub fn wmemchr(cx: *const wchar_t, c: wchar_t, n: size_t) -> *mut wchar_t;
548     pub fn memcmp(cx: *const c_void, ct: *const c_void, n: size_t) -> c_int;
549     pub fn memcpy(dest: *mut c_void, src: *const c_void, n: size_t) -> *mut c_void;
550     pub fn memmove(dest: *mut c_void, src: *const c_void, n: size_t) -> *mut c_void;
551     pub fn memset(dest: *mut c_void, c: c_int, n: size_t) -> *mut c_void;
552 }
553 
554 extern "C" {
555     #[cfg_attr(target_os = "netbsd", link_name = "__getpwnam50")]
556     pub fn getpwnam(name: *const ::c_char) -> *mut passwd;
557     #[cfg_attr(target_os = "netbsd", link_name = "__getpwuid50")]
558     pub fn getpwuid(uid: ::uid_t) -> *mut passwd;
559 
560     pub fn fprintf(stream: *mut ::FILE, format: *const ::c_char, ...) -> ::c_int;
561     pub fn printf(format: *const ::c_char, ...) -> ::c_int;
562     pub fn snprintf(s: *mut ::c_char, n: ::size_t, format: *const ::c_char, ...) -> ::c_int;
563     pub fn sprintf(s: *mut ::c_char, format: *const ::c_char, ...) -> ::c_int;
564     #[cfg_attr(
565         all(target_os = "linux", not(target_env = "uclibc")),
566         link_name = "__isoc99_fscanf"
567     )]
568     pub fn fscanf(stream: *mut ::FILE, format: *const ::c_char, ...) -> ::c_int;
569     #[cfg_attr(
570         all(target_os = "linux", not(target_env = "uclibc")),
571         link_name = "__isoc99_scanf"
572     )]
573     pub fn scanf(format: *const ::c_char, ...) -> ::c_int;
574     #[cfg_attr(
575         all(target_os = "linux", not(target_env = "uclibc")),
576         link_name = "__isoc99_sscanf"
577     )]
578     pub fn sscanf(s: *const ::c_char, format: *const ::c_char, ...) -> ::c_int;
579     pub fn getchar_unlocked() -> ::c_int;
580     pub fn putchar_unlocked(c: ::c_int) -> ::c_int;
581 
582     #[cfg(not(all(
583         libc_cfg_target_vendor,
584         target_arch = "powerpc",
585         target_vendor = "nintendo"
586     )))]
587     #[cfg_attr(target_os = "netbsd", link_name = "__socket30")]
588     #[cfg_attr(target_os = "illumos", link_name = "__xnet_socket")]
589     #[cfg_attr(target_os = "espidf", link_name = "lwip_socket")]
590     pub fn socket(domain: ::c_int, ty: ::c_int, protocol: ::c_int) -> ::c_int;
591     #[cfg(not(all(
592         libc_cfg_target_vendor,
593         target_arch = "powerpc",
594         target_vendor = "nintendo"
595     )))]
596     #[cfg_attr(
597         all(target_os = "macos", target_arch = "x86"),
598         link_name = "connect$UNIX2003"
599     )]
600     #[cfg_attr(target_os = "illumos", link_name = "__xnet_connect")]
601     #[cfg_attr(target_os = "espidf", link_name = "lwip_connect")]
602     pub fn connect(socket: ::c_int, address: *const sockaddr, len: socklen_t) -> ::c_int;
603     #[cfg_attr(
604         all(target_os = "macos", target_arch = "x86"),
605         link_name = "listen$UNIX2003"
606     )]
607     #[cfg_attr(target_os = "espidf", link_name = "lwip_listen")]
608     pub fn listen(socket: ::c_int, backlog: ::c_int) -> ::c_int;
609     #[cfg(not(all(
610         libc_cfg_target_vendor,
611         target_arch = "powerpc",
612         target_vendor = "nintendo"
613     )))]
614     #[cfg_attr(
615         all(target_os = "macos", target_arch = "x86"),
616         link_name = "accept$UNIX2003"
617     )]
618     #[cfg_attr(target_os = "espidf", link_name = "lwip_accept")]
619     pub fn accept(socket: ::c_int, address: *mut sockaddr, address_len: *mut socklen_t) -> ::c_int;
620     #[cfg(not(all(
621         libc_cfg_target_vendor,
622         target_arch = "powerpc",
623         target_vendor = "nintendo"
624     )))]
625     #[cfg_attr(
626         all(target_os = "macos", target_arch = "x86"),
627         link_name = "getpeername$UNIX2003"
628     )]
629     #[cfg_attr(target_os = "espidf", link_name = "lwip_getpeername")]
630     pub fn getpeername(
631         socket: ::c_int,
632         address: *mut sockaddr,
633         address_len: *mut socklen_t,
634     ) -> ::c_int;
635     #[cfg(not(all(
636         libc_cfg_target_vendor,
637         target_arch = "powerpc",
638         target_vendor = "nintendo"
639     )))]
640     #[cfg_attr(
641         all(target_os = "macos", target_arch = "x86"),
642         link_name = "getsockname$UNIX2003"
643     )]
644     #[cfg_attr(target_os = "espidf", link_name = "lwip_getsockname")]
645     pub fn getsockname(
646         socket: ::c_int,
647         address: *mut sockaddr,
648         address_len: *mut socklen_t,
649     ) -> ::c_int;
650     #[cfg_attr(target_os = "espidf", link_name = "lwip_setsockopt")]
651     pub fn setsockopt(
652         socket: ::c_int,
653         level: ::c_int,
654         name: ::c_int,
655         value: *const ::c_void,
656         option_len: socklen_t,
657     ) -> ::c_int;
658     #[cfg_attr(
659         all(target_os = "macos", target_arch = "x86"),
660         link_name = "socketpair$UNIX2003"
661     )]
662     #[cfg_attr(target_os = "illumos", link_name = "__xnet_socketpair")]
663     pub fn socketpair(
664         domain: ::c_int,
665         type_: ::c_int,
666         protocol: ::c_int,
667         socket_vector: *mut ::c_int,
668     ) -> ::c_int;
669     #[cfg(not(all(
670         libc_cfg_target_vendor,
671         target_arch = "powerpc",
672         target_vendor = "nintendo"
673     )))]
674     #[cfg_attr(
675         all(target_os = "macos", target_arch = "x86"),
676         link_name = "sendto$UNIX2003"
677     )]
678     #[cfg_attr(target_os = "illumos", link_name = "__xnet_sendto")]
679     #[cfg_attr(target_os = "espidf", link_name = "lwip_sendto")]
680     pub fn sendto(
681         socket: ::c_int,
682         buf: *const ::c_void,
683         len: ::size_t,
684         flags: ::c_int,
685         addr: *const sockaddr,
686         addrlen: socklen_t,
687     ) -> ::ssize_t;
688     #[cfg_attr(target_os = "espidf", link_name = "lwip_shutdown")]
689     pub fn shutdown(socket: ::c_int, how: ::c_int) -> ::c_int;
690 
691     #[cfg_attr(
692         all(target_os = "macos", target_arch = "x86"),
693         link_name = "chmod$UNIX2003"
694     )]
695     pub fn chmod(path: *const c_char, mode: mode_t) -> ::c_int;
696     #[cfg_attr(
697         all(target_os = "macos", target_arch = "x86"),
698         link_name = "fchmod$UNIX2003"
699     )]
700     pub fn fchmod(fd: ::c_int, mode: mode_t) -> ::c_int;
701 
702     #[cfg_attr(
703         all(target_os = "macos", not(target_arch = "aarch64")),
704         link_name = "fstat$INODE64"
705     )]
706     #[cfg_attr(target_os = "netbsd", link_name = "__fstat50")]
707     #[cfg_attr(
708         all(target_os = "freebsd", any(freebsd11, freebsd10)),
709         link_name = "fstat@FBSD_1.0"
710     )]
711     pub fn fstat(fildes: ::c_int, buf: *mut stat) -> ::c_int;
712 
713     pub fn mkdir(path: *const c_char, mode: mode_t) -> ::c_int;
714 
715     #[cfg_attr(
716         all(target_os = "macos", not(target_arch = "aarch64")),
717         link_name = "stat$INODE64"
718     )]
719     #[cfg_attr(target_os = "netbsd", link_name = "__stat50")]
720     #[cfg_attr(
721         all(target_os = "freebsd", any(freebsd11, freebsd10)),
722         link_name = "stat@FBSD_1.0"
723     )]
724     pub fn stat(path: *const c_char, buf: *mut stat) -> ::c_int;
725 
726     pub fn pclose(stream: *mut ::FILE) -> ::c_int;
727     #[cfg_attr(
728         all(target_os = "macos", target_arch = "x86"),
729         link_name = "fdopen$UNIX2003"
730     )]
731     pub fn fdopen(fd: ::c_int, mode: *const c_char) -> *mut ::FILE;
732     pub fn fileno(stream: *mut ::FILE) -> ::c_int;
733 
734     #[cfg_attr(
735         all(target_os = "macos", target_arch = "x86"),
736         link_name = "open$UNIX2003"
737     )]
738     pub fn open(path: *const c_char, oflag: ::c_int, ...) -> ::c_int;
739     #[cfg_attr(
740         all(target_os = "macos", target_arch = "x86"),
741         link_name = "creat$UNIX2003"
742     )]
743     pub fn creat(path: *const c_char, mode: mode_t) -> ::c_int;
744     #[cfg_attr(
745         all(target_os = "macos", target_arch = "x86"),
746         link_name = "fcntl$UNIX2003"
747     )]
748     pub fn fcntl(fd: ::c_int, cmd: ::c_int, ...) -> ::c_int;
749 
750     #[cfg_attr(
751         all(target_os = "macos", target_arch = "x86_64"),
752         link_name = "opendir$INODE64"
753     )]
754     #[cfg_attr(
755         all(target_os = "macos", target_arch = "x86"),
756         link_name = "opendir$INODE64$UNIX2003"
757     )]
758     #[cfg_attr(target_os = "netbsd", link_name = "__opendir30")]
759     pub fn opendir(dirname: *const c_char) -> *mut ::DIR;
760 
761     #[cfg_attr(
762         all(target_os = "macos", not(target_arch = "aarch64")),
763         link_name = "readdir$INODE64"
764     )]
765     #[cfg_attr(target_os = "netbsd", link_name = "__readdir30")]
766     #[cfg_attr(
767         all(target_os = "freebsd", any(freebsd11, freebsd10)),
768         link_name = "readdir@FBSD_1.0"
769     )]
770     pub fn readdir(dirp: *mut ::DIR) -> *mut ::dirent;
771     #[cfg_attr(
772         all(target_os = "macos", target_arch = "x86"),
773         link_name = "closedir$UNIX2003"
774     )]
775     pub fn closedir(dirp: *mut ::DIR) -> ::c_int;
776     #[cfg_attr(
777         all(target_os = "macos", target_arch = "x86_64"),
778         link_name = "rewinddir$INODE64"
779     )]
780     #[cfg_attr(
781         all(target_os = "macos", target_arch = "x86"),
782         link_name = "rewinddir$INODE64$UNIX2003"
783     )]
784     pub fn rewinddir(dirp: *mut ::DIR);
785 
786     pub fn fchmodat(
787         dirfd: ::c_int,
788         pathname: *const ::c_char,
789         mode: ::mode_t,
790         flags: ::c_int,
791     ) -> ::c_int;
792     pub fn fchown(fd: ::c_int, owner: ::uid_t, group: ::gid_t) -> ::c_int;
793     pub fn fchownat(
794         dirfd: ::c_int,
795         pathname: *const ::c_char,
796         owner: ::uid_t,
797         group: ::gid_t,
798         flags: ::c_int,
799     ) -> ::c_int;
800     #[cfg_attr(
801         all(target_os = "macos", not(target_arch = "aarch64")),
802         link_name = "fstatat$INODE64"
803     )]
804     #[cfg_attr(
805         all(target_os = "freebsd", any(freebsd11, freebsd10)),
806         link_name = "fstatat@FBSD_1.1"
807     )]
808     pub fn fstatat(
809         dirfd: ::c_int,
810         pathname: *const ::c_char,
811         buf: *mut stat,
812         flags: ::c_int,
813     ) -> ::c_int;
814     pub fn linkat(
815         olddirfd: ::c_int,
816         oldpath: *const ::c_char,
817         newdirfd: ::c_int,
818         newpath: *const ::c_char,
819         flags: ::c_int,
820     ) -> ::c_int;
821     pub fn renameat(
822         olddirfd: ::c_int,
823         oldpath: *const ::c_char,
824         newdirfd: ::c_int,
825         newpath: *const ::c_char,
826     ) -> ::c_int;
827     pub fn symlinkat(
828         target: *const ::c_char,
829         newdirfd: ::c_int,
830         linkpath: *const ::c_char,
831     ) -> ::c_int;
832     pub fn unlinkat(dirfd: ::c_int, pathname: *const ::c_char, flags: ::c_int) -> ::c_int;
833 
834     pub fn access(path: *const c_char, amode: ::c_int) -> ::c_int;
835     pub fn alarm(seconds: ::c_uint) -> ::c_uint;
836     pub fn chdir(dir: *const c_char) -> ::c_int;
837     pub fn fchdir(dirfd: ::c_int) -> ::c_int;
838     pub fn chown(path: *const c_char, uid: uid_t, gid: gid_t) -> ::c_int;
839     #[cfg_attr(
840         all(target_os = "macos", target_arch = "x86"),
841         link_name = "lchown$UNIX2003"
842     )]
843     pub fn lchown(path: *const c_char, uid: uid_t, gid: gid_t) -> ::c_int;
844     #[cfg_attr(
845         all(target_os = "macos", target_arch = "x86"),
846         link_name = "close$NOCANCEL$UNIX2003"
847     )]
848     #[cfg_attr(
849         all(target_os = "macos", target_arch = "x86_64"),
850         link_name = "close$NOCANCEL"
851     )]
852     pub fn close(fd: ::c_int) -> ::c_int;
853     pub fn dup(fd: ::c_int) -> ::c_int;
854     pub fn dup2(src: ::c_int, dst: ::c_int) -> ::c_int;
855     pub fn execl(path: *const c_char, arg0: *const c_char, ...) -> ::c_int;
856     pub fn execle(path: *const ::c_char, arg0: *const ::c_char, ...) -> ::c_int;
857     pub fn execlp(file: *const ::c_char, arg0: *const ::c_char, ...) -> ::c_int;
858     pub fn execv(prog: *const c_char, argv: *const *const c_char) -> ::c_int;
859     pub fn execve(
860         prog: *const c_char,
861         argv: *const *const c_char,
862         envp: *const *const c_char,
863     ) -> ::c_int;
864     pub fn execvp(c: *const c_char, argv: *const *const c_char) -> ::c_int;
865     pub fn fork() -> pid_t;
866     pub fn fpathconf(filedes: ::c_int, name: ::c_int) -> c_long;
867     pub fn getcwd(buf: *mut c_char, size: ::size_t) -> *mut c_char;
868     pub fn getegid() -> gid_t;
869     pub fn geteuid() -> uid_t;
870     pub fn getgid() -> gid_t;
871     pub fn getgroups(ngroups_max: ::c_int, groups: *mut gid_t) -> ::c_int;
872     #[cfg_attr(target_os = "illumos", link_name = "getloginx")]
873     pub fn getlogin() -> *mut c_char;
874     #[cfg_attr(
875         all(target_os = "macos", target_arch = "x86"),
876         link_name = "getopt$UNIX2003"
877     )]
878     pub fn getopt(argc: ::c_int, argv: *const *mut c_char, optstr: *const c_char) -> ::c_int;
879     pub fn getpgid(pid: pid_t) -> pid_t;
880     pub fn getpgrp() -> pid_t;
881     pub fn getpid() -> pid_t;
882     pub fn getppid() -> pid_t;
883     pub fn getuid() -> uid_t;
884     pub fn isatty(fd: ::c_int) -> ::c_int;
885     pub fn link(src: *const c_char, dst: *const c_char) -> ::c_int;
886     pub fn lseek(fd: ::c_int, offset: off_t, whence: ::c_int) -> off_t;
887     pub fn pathconf(path: *const c_char, name: ::c_int) -> c_long;
888     pub fn pipe(fds: *mut ::c_int) -> ::c_int;
889     pub fn posix_memalign(memptr: *mut *mut ::c_void, align: ::size_t, size: ::size_t) -> ::c_int;
890     #[cfg_attr(
891         all(target_os = "macos", target_arch = "x86"),
892         link_name = "read$UNIX2003"
893     )]
894     pub fn read(fd: ::c_int, buf: *mut ::c_void, count: ::size_t) -> ::ssize_t;
895     pub fn rmdir(path: *const c_char) -> ::c_int;
896     pub fn seteuid(uid: uid_t) -> ::c_int;
897     pub fn setegid(gid: gid_t) -> ::c_int;
898     pub fn setgid(gid: gid_t) -> ::c_int;
899     pub fn setpgid(pid: pid_t, pgid: pid_t) -> ::c_int;
900     pub fn setsid() -> pid_t;
901     pub fn setuid(uid: uid_t) -> ::c_int;
902     #[cfg_attr(
903         all(target_os = "macos", target_arch = "x86"),
904         link_name = "sleep$UNIX2003"
905     )]
906     pub fn sleep(secs: ::c_uint) -> ::c_uint;
907     #[cfg_attr(
908         all(target_os = "macos", target_arch = "x86"),
909         link_name = "nanosleep$UNIX2003"
910     )]
911     #[cfg_attr(target_os = "netbsd", link_name = "__nanosleep50")]
912     pub fn nanosleep(rqtp: *const timespec, rmtp: *mut timespec) -> ::c_int;
913     pub fn tcgetpgrp(fd: ::c_int) -> pid_t;
914     pub fn tcsetpgrp(fd: ::c_int, pgrp: ::pid_t) -> ::c_int;
915     pub fn ttyname(fd: ::c_int) -> *mut c_char;
916     #[cfg_attr(
917         all(target_os = "macos", target_arch = "x86"),
918         link_name = "ttyname_r$UNIX2003"
919     )]
920     #[cfg_attr(target_os = "illumos", link_name = "__posix_ttyname_r")]
921     pub fn ttyname_r(fd: ::c_int, buf: *mut c_char, buflen: ::size_t) -> ::c_int;
922     pub fn unlink(c: *const c_char) -> ::c_int;
923     #[cfg_attr(
924         all(target_os = "macos", target_arch = "x86"),
925         link_name = "wait$UNIX2003"
926     )]
927     pub fn wait(status: *mut ::c_int) -> pid_t;
928     #[cfg_attr(
929         all(target_os = "macos", target_arch = "x86"),
930         link_name = "waitpid$UNIX2003"
931     )]
932     pub fn waitpid(pid: pid_t, status: *mut ::c_int, options: ::c_int) -> pid_t;
933     #[cfg_attr(
934         all(target_os = "macos", target_arch = "x86"),
935         link_name = "write$UNIX2003"
936     )]
937     pub fn write(fd: ::c_int, buf: *const ::c_void, count: ::size_t) -> ::ssize_t;
938     #[cfg_attr(
939         all(target_os = "macos", target_arch = "x86"),
940         link_name = "pread$UNIX2003"
941     )]
942     pub fn pread(fd: ::c_int, buf: *mut ::c_void, count: ::size_t, offset: off_t) -> ::ssize_t;
943     #[cfg_attr(
944         all(target_os = "macos", target_arch = "x86"),
945         link_name = "pwrite$UNIX2003"
946     )]
947     pub fn pwrite(fd: ::c_int, buf: *const ::c_void, count: ::size_t, offset: off_t) -> ::ssize_t;
948     pub fn umask(mask: mode_t) -> mode_t;
949 
950     #[cfg_attr(target_os = "netbsd", link_name = "__utime50")]
951     pub fn utime(file: *const c_char, buf: *const utimbuf) -> ::c_int;
952 
953     #[cfg_attr(
954         all(target_os = "macos", target_arch = "x86"),
955         link_name = "kill$UNIX2003"
956     )]
957     pub fn kill(pid: pid_t, sig: ::c_int) -> ::c_int;
958     #[cfg_attr(
959         all(target_os = "macos", target_arch = "x86"),
960         link_name = "killpg$UNIX2003"
961     )]
962     pub fn killpg(pgrp: pid_t, sig: ::c_int) -> ::c_int;
963 
964     pub fn mlock(addr: *const ::c_void, len: ::size_t) -> ::c_int;
965     pub fn munlock(addr: *const ::c_void, len: ::size_t) -> ::c_int;
966     pub fn mlockall(flags: ::c_int) -> ::c_int;
967     pub fn munlockall() -> ::c_int;
968 
969     #[cfg_attr(
970         all(target_os = "macos", target_arch = "x86"),
971         link_name = "mmap$UNIX2003"
972     )]
973     pub fn mmap(
974         addr: *mut ::c_void,
975         len: ::size_t,
976         prot: ::c_int,
977         flags: ::c_int,
978         fd: ::c_int,
979         offset: off_t,
980     ) -> *mut ::c_void;
981     #[cfg_attr(
982         all(target_os = "macos", target_arch = "x86"),
983         link_name = "munmap$UNIX2003"
984     )]
985     pub fn munmap(addr: *mut ::c_void, len: ::size_t) -> ::c_int;
986 
987     pub fn if_nametoindex(ifname: *const c_char) -> ::c_uint;
988     pub fn if_indextoname(ifindex: ::c_uint, ifname: *mut ::c_char) -> *mut ::c_char;
989 
990     #[cfg_attr(
991         all(target_os = "macos", not(target_arch = "aarch64")),
992         link_name = "lstat$INODE64"
993     )]
994     #[cfg_attr(target_os = "netbsd", link_name = "__lstat50")]
995     #[cfg_attr(
996         all(target_os = "freebsd", any(freebsd11, freebsd10)),
997         link_name = "lstat@FBSD_1.0"
998     )]
999     pub fn lstat(path: *const c_char, buf: *mut stat) -> ::c_int;
1000 
1001     #[cfg_attr(
1002         all(target_os = "macos", target_arch = "x86"),
1003         link_name = "fsync$UNIX2003"
1004     )]
1005     pub fn fsync(fd: ::c_int) -> ::c_int;
1006 
1007     #[cfg_attr(
1008         all(target_os = "macos", target_arch = "x86"),
1009         link_name = "setenv$UNIX2003"
1010     )]
1011     pub fn setenv(name: *const c_char, val: *const c_char, overwrite: ::c_int) -> ::c_int;
1012     #[cfg_attr(
1013         all(target_os = "macos", target_arch = "x86"),
1014         link_name = "unsetenv$UNIX2003"
1015     )]
1016     #[cfg_attr(target_os = "netbsd", link_name = "__unsetenv13")]
1017     pub fn unsetenv(name: *const c_char) -> ::c_int;
1018 
1019     pub fn symlink(path1: *const c_char, path2: *const c_char) -> ::c_int;
1020 
1021     pub fn ftruncate(fd: ::c_int, length: off_t) -> ::c_int;
1022 
1023     pub fn signal(signum: ::c_int, handler: sighandler_t) -> sighandler_t;
1024 
1025     #[cfg_attr(target_os = "netbsd", link_name = "__getrusage50")]
1026     pub fn getrusage(resource: ::c_int, usage: *mut rusage) -> ::c_int;
1027 
1028     #[cfg_attr(
1029         any(target_os = "macos", target_os = "ios", target_os = "watchos"),
1030         link_name = "realpath$DARWIN_EXTSN"
1031     )]
1032     pub fn realpath(pathname: *const ::c_char, resolved: *mut ::c_char) -> *mut ::c_char;
1033 
1034     pub fn flock(fd: ::c_int, operation: ::c_int) -> ::c_int;
1035 
1036     #[cfg_attr(target_os = "netbsd", link_name = "__times13")]
1037     pub fn times(buf: *mut ::tms) -> ::clock_t;
1038 
1039     pub fn pthread_self() -> ::pthread_t;
1040     #[cfg_attr(
1041         all(target_os = "macos", target_arch = "x86"),
1042         link_name = "pthread_join$UNIX2003"
1043     )]
1044     pub fn pthread_join(native: ::pthread_t, value: *mut *mut ::c_void) -> ::c_int;
1045     pub fn pthread_exit(value: *mut ::c_void) -> !;
1046     pub fn pthread_attr_init(attr: *mut ::pthread_attr_t) -> ::c_int;
1047     pub fn pthread_attr_destroy(attr: *mut ::pthread_attr_t) -> ::c_int;
1048     pub fn pthread_attr_setstacksize(attr: *mut ::pthread_attr_t, stack_size: ::size_t) -> ::c_int;
1049     pub fn pthread_attr_setdetachstate(attr: *mut ::pthread_attr_t, state: ::c_int) -> ::c_int;
1050     pub fn pthread_detach(thread: ::pthread_t) -> ::c_int;
1051     #[cfg_attr(target_os = "netbsd", link_name = "__libc_thr_yield")]
1052     pub fn sched_yield() -> ::c_int;
1053     pub fn pthread_key_create(
1054         key: *mut pthread_key_t,
1055         dtor: ::Option<unsafe extern "C" fn(*mut ::c_void)>,
1056     ) -> ::c_int;
1057     pub fn pthread_key_delete(key: pthread_key_t) -> ::c_int;
1058     pub fn pthread_getspecific(key: pthread_key_t) -> *mut ::c_void;
1059     pub fn pthread_setspecific(key: pthread_key_t, value: *const ::c_void) -> ::c_int;
1060     pub fn pthread_mutex_init(
1061         lock: *mut pthread_mutex_t,
1062         attr: *const pthread_mutexattr_t,
1063     ) -> ::c_int;
1064     pub fn pthread_mutex_destroy(lock: *mut pthread_mutex_t) -> ::c_int;
1065     pub fn pthread_mutex_lock(lock: *mut pthread_mutex_t) -> ::c_int;
1066     pub fn pthread_mutex_trylock(lock: *mut pthread_mutex_t) -> ::c_int;
1067     pub fn pthread_mutex_unlock(lock: *mut pthread_mutex_t) -> ::c_int;
1068 
1069     pub fn pthread_mutexattr_init(attr: *mut pthread_mutexattr_t) -> ::c_int;
1070     #[cfg_attr(
1071         all(target_os = "macos", target_arch = "x86"),
1072         link_name = "pthread_mutexattr_destroy$UNIX2003"
1073     )]
1074     pub fn pthread_mutexattr_destroy(attr: *mut pthread_mutexattr_t) -> ::c_int;
1075     pub fn pthread_mutexattr_settype(attr: *mut pthread_mutexattr_t, _type: ::c_int) -> ::c_int;
1076 
1077     #[cfg_attr(
1078         all(target_os = "macos", target_arch = "x86"),
1079         link_name = "pthread_cond_init$UNIX2003"
1080     )]
1081     pub fn pthread_cond_init(cond: *mut pthread_cond_t, attr: *const pthread_condattr_t)
1082         -> ::c_int;
1083     #[cfg_attr(
1084         all(target_os = "macos", target_arch = "x86"),
1085         link_name = "pthread_cond_wait$UNIX2003"
1086     )]
1087     pub fn pthread_cond_wait(cond: *mut pthread_cond_t, lock: *mut pthread_mutex_t) -> ::c_int;
1088     #[cfg_attr(
1089         all(target_os = "macos", target_arch = "x86"),
1090         link_name = "pthread_cond_timedwait$UNIX2003"
1091     )]
1092     pub fn pthread_cond_timedwait(
1093         cond: *mut pthread_cond_t,
1094         lock: *mut pthread_mutex_t,
1095         abstime: *const ::timespec,
1096     ) -> ::c_int;
1097     pub fn pthread_cond_signal(cond: *mut pthread_cond_t) -> ::c_int;
1098     pub fn pthread_cond_broadcast(cond: *mut pthread_cond_t) -> ::c_int;
1099     pub fn pthread_cond_destroy(cond: *mut pthread_cond_t) -> ::c_int;
1100     pub fn pthread_condattr_init(attr: *mut pthread_condattr_t) -> ::c_int;
1101     pub fn pthread_condattr_destroy(attr: *mut pthread_condattr_t) -> ::c_int;
1102     #[cfg_attr(
1103         all(target_os = "macos", target_arch = "x86"),
1104         link_name = "pthread_rwlock_init$UNIX2003"
1105     )]
1106     pub fn pthread_rwlock_init(
1107         lock: *mut pthread_rwlock_t,
1108         attr: *const pthread_rwlockattr_t,
1109     ) -> ::c_int;
1110     #[cfg_attr(
1111         all(target_os = "macos", target_arch = "x86"),
1112         link_name = "pthread_rwlock_destroy$UNIX2003"
1113     )]
1114     pub fn pthread_rwlock_destroy(lock: *mut pthread_rwlock_t) -> ::c_int;
1115     #[cfg_attr(
1116         all(target_os = "macos", target_arch = "x86"),
1117         link_name = "pthread_rwlock_rdlock$UNIX2003"
1118     )]
1119     pub fn pthread_rwlock_rdlock(lock: *mut pthread_rwlock_t) -> ::c_int;
1120     #[cfg_attr(
1121         all(target_os = "macos", target_arch = "x86"),
1122         link_name = "pthread_rwlock_tryrdlock$UNIX2003"
1123     )]
1124     pub fn pthread_rwlock_tryrdlock(lock: *mut pthread_rwlock_t) -> ::c_int;
1125     #[cfg_attr(
1126         all(target_os = "macos", target_arch = "x86"),
1127         link_name = "pthread_rwlock_wrlock$UNIX2003"
1128     )]
1129     pub fn pthread_rwlock_wrlock(lock: *mut pthread_rwlock_t) -> ::c_int;
1130     #[cfg_attr(
1131         all(target_os = "macos", target_arch = "x86"),
1132         link_name = "pthread_rwlock_trywrlock$UNIX2003"
1133     )]
1134     pub fn pthread_rwlock_trywrlock(lock: *mut pthread_rwlock_t) -> ::c_int;
1135     #[cfg_attr(
1136         all(target_os = "macos", target_arch = "x86"),
1137         link_name = "pthread_rwlock_unlock$UNIX2003"
1138     )]
1139     pub fn pthread_rwlock_unlock(lock: *mut pthread_rwlock_t) -> ::c_int;
1140     pub fn pthread_rwlockattr_init(attr: *mut pthread_rwlockattr_t) -> ::c_int;
1141     pub fn pthread_rwlockattr_destroy(attr: *mut pthread_rwlockattr_t) -> ::c_int;
1142 
1143     #[cfg_attr(target_os = "illumos", link_name = "__xnet_getsockopt")]
1144     #[cfg_attr(target_os = "espidf", link_name = "lwip_getsockopt")]
1145     pub fn getsockopt(
1146         sockfd: ::c_int,
1147         level: ::c_int,
1148         optname: ::c_int,
1149         optval: *mut ::c_void,
1150         optlen: *mut ::socklen_t,
1151     ) -> ::c_int;
1152     pub fn raise(signum: ::c_int) -> ::c_int;
1153     #[cfg_attr(target_os = "netbsd", link_name = "__sigaction14")]
1154     pub fn sigaction(signum: ::c_int, act: *const sigaction, oldact: *mut sigaction) -> ::c_int;
1155 
1156     #[cfg_attr(target_os = "netbsd", link_name = "__utimes50")]
1157     pub fn utimes(filename: *const ::c_char, times: *const ::timeval) -> ::c_int;
1158     pub fn dlopen(filename: *const ::c_char, flag: ::c_int) -> *mut ::c_void;
1159     pub fn dlerror() -> *mut ::c_char;
1160     pub fn dlsym(handle: *mut ::c_void, symbol: *const ::c_char) -> *mut ::c_void;
1161     pub fn dlclose(handle: *mut ::c_void) -> ::c_int;
1162     pub fn dladdr(addr: *const ::c_void, info: *mut Dl_info) -> ::c_int;
1163 
1164     #[cfg(not(all(
1165         libc_cfg_target_vendor,
1166         target_arch = "powerpc",
1167         target_vendor = "nintendo"
1168     )))]
1169     #[cfg_attr(target_os = "illumos", link_name = "__xnet_getaddrinfo")]
1170     #[cfg_attr(target_os = "espidf", link_name = "lwip_getaddrinfo")]
1171     pub fn getaddrinfo(
1172         node: *const c_char,
1173         service: *const c_char,
1174         hints: *const addrinfo,
1175         res: *mut *mut addrinfo,
1176     ) -> ::c_int;
1177     #[cfg(not(all(
1178         libc_cfg_target_vendor,
1179         target_arch = "powerpc",
1180         target_vendor = "nintendo"
1181     )))]
1182     #[cfg_attr(target_os = "espidf", link_name = "lwip_freeaddrinfo")]
1183     pub fn freeaddrinfo(res: *mut addrinfo);
1184     pub fn hstrerror(errcode: ::c_int) -> *const ::c_char;
1185     pub fn gai_strerror(errcode: ::c_int) -> *const ::c_char;
1186     #[cfg_attr(
1187         any(
1188             all(target_os = "linux", not(target_env = "musl")),
1189             target_os = "freebsd",
1190             target_os = "dragonfly",
1191             target_os = "haiku"
1192         ),
1193         link_name = "__res_init"
1194     )]
1195     #[cfg_attr(
1196         any(target_os = "macos", target_os = "ios", target_os = "watchos"),
1197         link_name = "res_9_init"
1198     )]
1199     pub fn res_init() -> ::c_int;
1200 
1201     #[cfg_attr(target_os = "netbsd", link_name = "__gmtime_r50")]
1202     #[cfg_attr(target_env = "musl", allow(deprecated))]
1203     // FIXME: for `time_t`
1204     pub fn gmtime_r(time_p: *const time_t, result: *mut tm) -> *mut tm;
1205     #[cfg_attr(target_os = "netbsd", link_name = "__localtime_r50")]
1206     #[cfg_attr(target_env = "musl", allow(deprecated))]
1207     // FIXME: for `time_t`
1208     pub fn localtime_r(time_p: *const time_t, result: *mut tm) -> *mut tm;
1209     #[cfg_attr(
1210         all(target_os = "macos", target_arch = "x86"),
1211         link_name = "mktime$UNIX2003"
1212     )]
1213     #[cfg_attr(target_os = "netbsd", link_name = "__mktime50")]
1214     #[cfg_attr(target_env = "musl", allow(deprecated))]
1215     // FIXME: for `time_t`
1216     pub fn mktime(tm: *mut tm) -> time_t;
1217     #[cfg_attr(target_os = "netbsd", link_name = "__time50")]
1218     #[cfg_attr(target_env = "musl", allow(deprecated))]
1219     // FIXME: for `time_t`
1220     pub fn time(time: *mut time_t) -> time_t;
1221     #[cfg_attr(target_os = "netbsd", link_name = "__gmtime50")]
1222     #[cfg_attr(target_env = "musl", allow(deprecated))]
1223     // FIXME: for `time_t`
1224     pub fn gmtime(time_p: *const time_t) -> *mut tm;
1225     #[cfg_attr(target_os = "netbsd", link_name = "__locatime50")]
1226     #[cfg_attr(target_env = "musl", allow(deprecated))]
1227     // FIXME: for `time_t`
1228     pub fn localtime(time_p: *const time_t) -> *mut tm;
1229     #[cfg_attr(target_os = "netbsd", link_name = "__difftime50")]
1230     #[cfg_attr(target_env = "musl", allow(deprecated))]
1231     // FIXME: for `time_t`
1232     pub fn difftime(time1: time_t, time0: time_t) -> ::c_double;
1233     #[cfg_attr(target_os = "netbsd", link_name = "__timegm50")]
1234     #[cfg_attr(target_env = "musl", allow(deprecated))]
1235     // FIXME: for `time_t`
1236     pub fn timegm(tm: *mut ::tm) -> time_t;
1237 
1238     #[cfg_attr(target_os = "netbsd", link_name = "__mknod50")]
1239     #[cfg_attr(
1240         all(target_os = "freebsd", any(freebsd11, freebsd10)),
1241         link_name = "mknod@FBSD_1.0"
1242     )]
1243     pub fn mknod(pathname: *const ::c_char, mode: ::mode_t, dev: ::dev_t) -> ::c_int;
1244     pub fn gethostname(name: *mut ::c_char, len: ::size_t) -> ::c_int;
1245     pub fn endservent();
1246     pub fn getservbyname(name: *const ::c_char, proto: *const ::c_char) -> *mut servent;
1247     pub fn getservbyport(port: ::c_int, proto: *const ::c_char) -> *mut servent;
1248     pub fn getservent() -> *mut servent;
1249     pub fn setservent(stayopen: ::c_int);
1250     pub fn getprotobyname(name: *const ::c_char) -> *mut protoent;
1251     pub fn getprotobynumber(proto: ::c_int) -> *mut protoent;
1252     pub fn chroot(name: *const ::c_char) -> ::c_int;
1253     #[cfg_attr(
1254         all(target_os = "macos", target_arch = "x86"),
1255         link_name = "usleep$UNIX2003"
1256     )]
1257     pub fn usleep(secs: ::c_uint) -> ::c_int;
1258     #[cfg_attr(
1259         all(target_os = "macos", target_arch = "x86"),
1260         link_name = "send$UNIX2003"
1261     )]
1262     #[cfg_attr(target_os = "espidf", link_name = "lwip_send")]
1263     pub fn send(socket: ::c_int, buf: *const ::c_void, len: ::size_t, flags: ::c_int) -> ::ssize_t;
1264     #[cfg_attr(
1265         all(target_os = "macos", target_arch = "x86"),
1266         link_name = "recv$UNIX2003"
1267     )]
1268     #[cfg_attr(target_os = "espidf", link_name = "lwip_recv")]
1269     pub fn recv(socket: ::c_int, buf: *mut ::c_void, len: ::size_t, flags: ::c_int) -> ::ssize_t;
1270     #[cfg_attr(
1271         all(target_os = "macos", target_arch = "x86"),
1272         link_name = "putenv$UNIX2003"
1273     )]
1274     #[cfg_attr(target_os = "netbsd", link_name = "__putenv50")]
1275     pub fn putenv(string: *mut c_char) -> ::c_int;
1276     #[cfg_attr(
1277         all(target_os = "macos", target_arch = "x86"),
1278         link_name = "poll$UNIX2003"
1279     )]
1280     pub fn poll(fds: *mut pollfd, nfds: nfds_t, timeout: ::c_int) -> ::c_int;
1281     #[cfg_attr(
1282         all(target_os = "macos", target_arch = "x86_64"),
1283         link_name = "select$1050"
1284     )]
1285     #[cfg_attr(
1286         all(target_os = "macos", target_arch = "x86"),
1287         link_name = "select$UNIX2003"
1288     )]
1289     #[cfg_attr(target_os = "netbsd", link_name = "__select50")]
1290     pub fn select(
1291         nfds: ::c_int,
1292         readfs: *mut fd_set,
1293         writefds: *mut fd_set,
1294         errorfds: *mut fd_set,
1295         timeout: *mut timeval,
1296     ) -> ::c_int;
1297     #[cfg_attr(target_os = "netbsd", link_name = "__setlocale50")]
1298     pub fn setlocale(category: ::c_int, locale: *const ::c_char) -> *mut ::c_char;
1299     pub fn localeconv() -> *mut lconv;
1300 
1301     #[cfg_attr(
1302         all(target_os = "macos", target_arch = "x86"),
1303         link_name = "sem_wait$UNIX2003"
1304     )]
1305     pub fn sem_wait(sem: *mut sem_t) -> ::c_int;
1306     pub fn sem_trywait(sem: *mut sem_t) -> ::c_int;
1307     pub fn sem_post(sem: *mut sem_t) -> ::c_int;
1308     pub fn statvfs(path: *const c_char, buf: *mut statvfs) -> ::c_int;
1309     pub fn fstatvfs(fd: ::c_int, buf: *mut statvfs) -> ::c_int;
1310 
1311     pub fn readlink(path: *const c_char, buf: *mut c_char, bufsz: ::size_t) -> ::ssize_t;
1312 
1313     #[cfg_attr(target_os = "netbsd", link_name = "__sigemptyset14")]
1314     pub fn sigemptyset(set: *mut sigset_t) -> ::c_int;
1315     #[cfg_attr(target_os = "netbsd", link_name = "__sigaddset14")]
1316     pub fn sigaddset(set: *mut sigset_t, signum: ::c_int) -> ::c_int;
1317     #[cfg_attr(target_os = "netbsd", link_name = "__sigfillset14")]
1318     pub fn sigfillset(set: *mut sigset_t) -> ::c_int;
1319     #[cfg_attr(target_os = "netbsd", link_name = "__sigdelset14")]
1320     pub fn sigdelset(set: *mut sigset_t, signum: ::c_int) -> ::c_int;
1321     #[cfg_attr(target_os = "netbsd", link_name = "__sigismember14")]
1322     pub fn sigismember(set: *const sigset_t, signum: ::c_int) -> ::c_int;
1323 
1324     #[cfg_attr(target_os = "netbsd", link_name = "__sigprocmask14")]
1325     pub fn sigprocmask(how: ::c_int, set: *const sigset_t, oldset: *mut sigset_t) -> ::c_int;
1326     #[cfg_attr(target_os = "netbsd", link_name = "__sigpending14")]
1327     pub fn sigpending(set: *mut sigset_t) -> ::c_int;
1328 
1329     pub fn sysconf(name: ::c_int) -> ::c_long;
1330 
1331     pub fn mkfifo(path: *const c_char, mode: mode_t) -> ::c_int;
1332 
1333     #[cfg_attr(
1334         all(target_os = "macos", target_arch = "x86_64"),
1335         link_name = "pselect$1050"
1336     )]
1337     #[cfg_attr(
1338         all(target_os = "macos", target_arch = "x86"),
1339         link_name = "pselect$UNIX2003"
1340     )]
1341     #[cfg_attr(target_os = "netbsd", link_name = "__pselect50")]
1342     pub fn pselect(
1343         nfds: ::c_int,
1344         readfs: *mut fd_set,
1345         writefds: *mut fd_set,
1346         errorfds: *mut fd_set,
1347         timeout: *const timespec,
1348         sigmask: *const sigset_t,
1349     ) -> ::c_int;
1350     pub fn fseeko(stream: *mut ::FILE, offset: ::off_t, whence: ::c_int) -> ::c_int;
1351     pub fn ftello(stream: *mut ::FILE) -> ::off_t;
1352     #[cfg_attr(
1353         all(target_os = "macos", target_arch = "x86"),
1354         link_name = "tcdrain$UNIX2003"
1355     )]
1356     pub fn tcdrain(fd: ::c_int) -> ::c_int;
1357     pub fn cfgetispeed(termios: *const ::termios) -> ::speed_t;
1358     pub fn cfgetospeed(termios: *const ::termios) -> ::speed_t;
1359     pub fn cfsetispeed(termios: *mut ::termios, speed: ::speed_t) -> ::c_int;
1360     pub fn cfsetospeed(termios: *mut ::termios, speed: ::speed_t) -> ::c_int;
1361     pub fn tcgetattr(fd: ::c_int, termios: *mut ::termios) -> ::c_int;
1362     pub fn tcsetattr(fd: ::c_int, optional_actions: ::c_int, termios: *const ::termios) -> ::c_int;
1363     pub fn tcflow(fd: ::c_int, action: ::c_int) -> ::c_int;
1364     pub fn tcflush(fd: ::c_int, action: ::c_int) -> ::c_int;
1365     pub fn tcgetsid(fd: ::c_int) -> ::pid_t;
1366     pub fn tcsendbreak(fd: ::c_int, duration: ::c_int) -> ::c_int;
1367     pub fn mkstemp(template: *mut ::c_char) -> ::c_int;
1368     pub fn mkdtemp(template: *mut ::c_char) -> *mut ::c_char;
1369 
1370     pub fn tmpnam(ptr: *mut ::c_char) -> *mut ::c_char;
1371 
1372     pub fn openlog(ident: *const ::c_char, logopt: ::c_int, facility: ::c_int);
1373     pub fn closelog();
1374     pub fn setlogmask(maskpri: ::c_int) -> ::c_int;
1375     #[cfg_attr(target_os = "macos", link_name = "syslog$DARWIN_EXTSN")]
1376     pub fn syslog(priority: ::c_int, message: *const ::c_char, ...);
1377     #[cfg_attr(
1378         all(target_os = "macos", target_arch = "x86"),
1379         link_name = "nice$UNIX2003"
1380     )]
1381     pub fn nice(incr: ::c_int) -> ::c_int;
1382 
1383     pub fn grantpt(fd: ::c_int) -> ::c_int;
1384     pub fn posix_openpt(flags: ::c_int) -> ::c_int;
1385     pub fn ptsname(fd: ::c_int) -> *mut ::c_char;
1386     pub fn unlockpt(fd: ::c_int) -> ::c_int;
1387 
1388     pub fn strcasestr(cs: *const c_char, ct: *const c_char) -> *mut c_char;
1389     pub fn getline(lineptr: *mut *mut c_char, n: *mut size_t, stream: *mut FILE) -> ssize_t;
1390 
1391     pub fn lockf(fd: ::c_int, cmd: ::c_int, len: ::off_t) -> ::c_int;
1392 }
1393 
1394 cfg_if! {
1395     if #[cfg(not(target_env = "uclibc"))] {
1396         extern "C" {
1397             pub fn open_wmemstream(
1398                 ptr: *mut *mut wchar_t,
1399                 sizeloc: *mut size_t,
1400             ) -> *mut FILE;
1401         }
1402     }
1403 }
1404 
1405 cfg_if! {
1406     if #[cfg(not(target_os = "redox"))] {
1407         extern {
1408             pub fn getsid(pid: pid_t) -> pid_t;
1409             pub fn truncate(path: *const c_char, length: off_t) -> ::c_int;
1410             #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
1411                        link_name = "pause$UNIX2003")]
1412             pub fn pause() -> ::c_int;
1413 
1414             pub fn readlinkat(dirfd: ::c_int,
1415                               pathname: *const ::c_char,
1416                               buf: *mut ::c_char,
1417                               bufsiz: ::size_t) -> ::ssize_t;
1418             pub fn mkdirat(dirfd: ::c_int, pathname: *const ::c_char,
1419                            mode: ::mode_t) -> ::c_int;
1420             pub fn openat(dirfd: ::c_int, pathname: *const ::c_char,
1421                           flags: ::c_int, ...) -> ::c_int;
1422 
1423             #[cfg_attr(all(target_os = "macos", target_arch = "x86_64"),
1424                        link_name = "fdopendir$INODE64")]
1425             #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
1426                        link_name = "fdopendir$INODE64$UNIX2003")]
1427             pub fn fdopendir(fd: ::c_int) -> *mut ::DIR;
1428 
1429             #[cfg_attr(all(target_os = "macos", not(target_arch = "aarch64")),
1430                        link_name = "readdir_r$INODE64")]
1431             #[cfg_attr(target_os = "netbsd", link_name = "__readdir_r30")]
1432             #[cfg_attr(
1433                 all(target_os = "freebsd", any(freebsd11, freebsd10)),
1434                 link_name = "readdir_r@FBSD_1.0"
1435             )]
1436             #[allow(non_autolinks)] // FIXME: `<>` breaks line length limit.
1437             /// The 64-bit libc on Solaris and illumos only has readdir_r. If a
1438             /// 32-bit Solaris or illumos target is ever created, it should use
1439             /// __posix_readdir_r. See libc(3LIB) on Solaris or illumos:
1440             /// https://illumos.org/man/3lib/libc
1441             /// https://docs.oracle.com/cd/E36784_01/html/E36873/libc-3lib.html
1442             /// https://www.unix.com/man-page/opensolaris/3LIB/libc/
1443             pub fn readdir_r(dirp: *mut ::DIR, entry: *mut ::dirent,
1444                              result: *mut *mut ::dirent) -> ::c_int;
1445         }
1446     }
1447 }
1448 
1449 cfg_if! {
1450    if #[cfg(not(any(target_os = "solaris", target_os = "illumos")))] {
1451         extern {
1452             pub fn cfmakeraw(termios: *mut ::termios);
1453             pub fn cfsetspeed(termios: *mut ::termios,
1454                               speed: ::speed_t) -> ::c_int;
1455         }
1456    }
1457 }
1458 
1459 cfg_if! {
1460     if #[cfg(target_env = "newlib")] {
1461         mod newlib;
1462         pub use self::newlib::*;
1463     } else if #[cfg(any(target_os = "linux",
1464                         target_os = "l4re",
1465                         target_os = "android",
1466                         target_os = "emscripten"))] {
1467         mod linux_like;
1468         pub use self::linux_like::*;
1469     } else if #[cfg(any(target_os = "macos",
1470                         target_os = "ios",
1471                         target_os = "watchos",
1472                         target_os = "freebsd",
1473                         target_os = "dragonfly",
1474                         target_os = "openbsd",
1475                         target_os = "netbsd"))] {
1476         mod bsd;
1477         pub use self::bsd::*;
1478     } else if #[cfg(any(target_os = "solaris",
1479                         target_os = "illumos"))] {
1480         mod solarish;
1481         pub use self::solarish::*;
1482     } else if #[cfg(target_os = "haiku")] {
1483         mod haiku;
1484         pub use self::haiku::*;
1485     } else if #[cfg(target_os = "hermit")] {
1486         mod hermit;
1487         pub use self::hermit::*;
1488     } else if #[cfg(target_os = "redox")] {
1489         mod redox;
1490         pub use self::redox::*;
1491     } else {
1492         // Unknown target_os
1493     }
1494 }
1495 
1496 cfg_if! {
1497     if #[cfg(libc_core_cvoid)] {
1498         pub use ::ffi::c_void;
1499     } else {
1500         // Use repr(u8) as LLVM expects `void*` to be the same as `i8*` to help
1501         // enable more optimization opportunities around it recognizing things
1502         // like malloc/free.
1503         #[repr(u8)]
1504         #[allow(missing_copy_implementations)]
1505         #[allow(missing_debug_implementations)]
1506         pub enum c_void {
1507             // Two dummy variants so the #[repr] attribute can be used.
1508             #[doc(hidden)]
1509             __variant1,
1510             #[doc(hidden)]
1511             __variant2,
1512         }
1513     }
1514 }
1515 
1516 cfg_if! {
1517     if #[cfg(libc_align)] {
1518         mod align;
1519         pub use self::align::*;
1520     } else {
1521         mod no_align;
1522         pub use self::no_align::*;
1523     }
1524 }
1525