xref: /rust-libc-0.2.174/src/unix/mod.rs (revision a3cbf5f0)
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", target_os = "vita"))] {
33         pub type uid_t = ::c_ushort;
34         pub type gid_t = ::c_ushort;
35     } else if #[cfg(target_os = "nto")] {
36         pub type uid_t = i32;
37         pub type gid_t = i32;
38     } else {
39         pub type uid_t = u32;
40         pub type gid_t = u32;
41     }
42 }
43 
44 missing! {
45     #[cfg_attr(feature = "extra_traits", derive(Debug))]
46     pub enum DIR {}
47 }
48 pub type locale_t = *mut ::c_void;
49 
50 s! {
51     pub struct group {
52         pub gr_name: *mut ::c_char,
53         pub gr_passwd: *mut ::c_char,
54         pub gr_gid: ::gid_t,
55         pub gr_mem: *mut *mut ::c_char,
56     }
57 
58     pub struct utimbuf {
59         pub actime: time_t,
60         pub modtime: time_t,
61     }
62 
63     pub struct timeval {
64         pub tv_sec: time_t,
65         pub tv_usec: suseconds_t,
66     }
67 
68     // linux x32 compatibility
69     // See https://sourceware.org/bugzilla/show_bug.cgi?id=16437
70     pub struct timespec {
71         pub tv_sec: time_t,
72         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
73         pub tv_nsec: i64,
74         #[cfg(not(all(target_arch = "x86_64", target_pointer_width = "32")))]
75         pub tv_nsec: ::c_long,
76     }
77 
78     pub struct rlimit {
79         pub rlim_cur: rlim_t,
80         pub rlim_max: rlim_t,
81     }
82 
83     pub struct rusage {
84         pub ru_utime: timeval,
85         pub ru_stime: timeval,
86         pub ru_maxrss: c_long,
87         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
88         __pad1: u32,
89         pub ru_ixrss: c_long,
90         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
91         __pad2: u32,
92         pub ru_idrss: c_long,
93         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
94         __pad3: u32,
95         pub ru_isrss: c_long,
96         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
97         __pad4: u32,
98         pub ru_minflt: c_long,
99         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
100         __pad5: u32,
101         pub ru_majflt: c_long,
102         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
103         __pad6: u32,
104         pub ru_nswap: c_long,
105         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
106         __pad7: u32,
107         pub ru_inblock: c_long,
108         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
109         __pad8: u32,
110         pub ru_oublock: c_long,
111         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
112         __pad9: u32,
113         pub ru_msgsnd: c_long,
114         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
115         __pad10: u32,
116         pub ru_msgrcv: c_long,
117         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
118         __pad11: u32,
119         pub ru_nsignals: c_long,
120         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
121         __pad12: u32,
122         pub ru_nvcsw: c_long,
123         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
124         __pad13: u32,
125         pub ru_nivcsw: c_long,
126         #[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
127         __pad14: u32,
128 
129         #[cfg(any(target_env = "musl", target_env = "ohos", target_os = "emscripten"))]
130         __reserved: [c_long; 16],
131     }
132 
133     pub struct ipv6_mreq {
134         pub ipv6mr_multiaddr: in6_addr,
135         #[cfg(target_os = "android")]
136         pub ipv6mr_interface: ::c_int,
137         #[cfg(not(target_os = "android"))]
138         pub ipv6mr_interface: ::c_uint,
139     }
140 
141     pub struct hostent {
142         pub h_name: *mut ::c_char,
143         pub h_aliases: *mut *mut ::c_char,
144         pub h_addrtype: ::c_int,
145         pub h_length: ::c_int,
146         pub h_addr_list: *mut *mut ::c_char,
147     }
148 
149     pub struct iovec {
150         pub iov_base: *mut ::c_void,
151         pub iov_len: ::size_t,
152     }
153 
154     pub struct pollfd {
155         pub fd: ::c_int,
156         pub events: ::c_short,
157         pub revents: ::c_short,
158     }
159 
160     pub struct winsize {
161         pub ws_row: ::c_ushort,
162         pub ws_col: ::c_ushort,
163         pub ws_xpixel: ::c_ushort,
164         pub ws_ypixel: ::c_ushort,
165     }
166 
167     pub struct linger {
168         pub l_onoff: ::c_int,
169         pub l_linger: ::c_int,
170     }
171 
172     pub struct sigval {
173         // Actually a union of an int and a void*
174         pub sival_ptr: *mut ::c_void
175     }
176 
177     // <sys/time.h>
178     pub struct itimerval {
179         pub it_interval: ::timeval,
180         pub it_value: ::timeval,
181     }
182 
183     // <sys/times.h>
184     pub struct tms {
185         pub tms_utime: ::clock_t,
186         pub tms_stime: ::clock_t,
187         pub tms_cutime: ::clock_t,
188         pub tms_cstime: ::clock_t,
189     }
190 
191     pub struct servent {
192         pub s_name: *mut ::c_char,
193         pub s_aliases: *mut *mut ::c_char,
194         pub s_port: ::c_int,
195         pub s_proto: *mut ::c_char,
196     }
197 
198     pub struct protoent {
199         pub p_name: *mut ::c_char,
200         pub p_aliases: *mut *mut ::c_char,
201         pub p_proto: ::c_int,
202     }
203 }
204 
205 pub const INT_MIN: c_int = -2147483648;
206 pub const INT_MAX: c_int = 2147483647;
207 
208 pub const SIG_DFL: sighandler_t = 0 as sighandler_t;
209 pub const SIG_IGN: sighandler_t = 1 as sighandler_t;
210 pub const SIG_ERR: sighandler_t = !0 as sighandler_t;
211 cfg_if! {
212     if #[cfg(not(target_os = "nto"))] {
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 }
223 cfg_if! {
224     if #[cfg(not(target_os = "redox"))] {
225         pub const FD_CLOEXEC: ::c_int = 0x1;
226     }
227 }
228 
229 cfg_if! {
230     if #[cfg(not(target_os = "nto"))]
231     {
232         pub const USRQUOTA: ::c_int = 0;
233         pub const GRPQUOTA: ::c_int = 1;
234     }
235 }
236 pub const SIGIOT: ::c_int = 6;
237 
238 pub const S_ISUID: ::mode_t = 0x800;
239 pub const S_ISGID: ::mode_t = 0x400;
240 pub const S_ISVTX: ::mode_t = 0x200;
241 
242 cfg_if! {
243     if #[cfg(not(any(target_os = "haiku", target_os = "illumos",
244                      target_os = "solaris")))] {
245         pub const IF_NAMESIZE: ::size_t = 16;
246         pub const IFNAMSIZ: ::size_t = IF_NAMESIZE;
247     }
248 }
249 
250 pub const LOG_EMERG: ::c_int = 0;
251 pub const LOG_ALERT: ::c_int = 1;
252 pub const LOG_CRIT: ::c_int = 2;
253 pub const LOG_ERR: ::c_int = 3;
254 pub const LOG_WARNING: ::c_int = 4;
255 pub const LOG_NOTICE: ::c_int = 5;
256 pub const LOG_INFO: ::c_int = 6;
257 pub const LOG_DEBUG: ::c_int = 7;
258 
259 pub const LOG_KERN: ::c_int = 0;
260 pub const LOG_USER: ::c_int = 1 << 3;
261 pub const LOG_MAIL: ::c_int = 2 << 3;
262 pub const LOG_DAEMON: ::c_int = 3 << 3;
263 pub const LOG_AUTH: ::c_int = 4 << 3;
264 pub const LOG_SYSLOG: ::c_int = 5 << 3;
265 pub const LOG_LPR: ::c_int = 6 << 3;
266 pub const LOG_NEWS: ::c_int = 7 << 3;
267 pub const LOG_UUCP: ::c_int = 8 << 3;
268 pub const LOG_LOCAL0: ::c_int = 16 << 3;
269 pub const LOG_LOCAL1: ::c_int = 17 << 3;
270 pub const LOG_LOCAL2: ::c_int = 18 << 3;
271 pub const LOG_LOCAL3: ::c_int = 19 << 3;
272 pub const LOG_LOCAL4: ::c_int = 20 << 3;
273 pub const LOG_LOCAL5: ::c_int = 21 << 3;
274 pub const LOG_LOCAL6: ::c_int = 22 << 3;
275 pub const LOG_LOCAL7: ::c_int = 23 << 3;
276 
277 cfg_if! {
278     if #[cfg(not(target_os = "haiku"))] {
279         pub const LOG_PID: ::c_int = 0x01;
280         pub const LOG_CONS: ::c_int = 0x02;
281         pub const LOG_ODELAY: ::c_int = 0x04;
282         pub const LOG_NDELAY: ::c_int = 0x08;
283         pub const LOG_NOWAIT: ::c_int = 0x10;
284     }
285 }
286 pub const LOG_PRIMASK: ::c_int = 7;
287 pub const LOG_FACMASK: ::c_int = 0x3f8;
288 
289 cfg_if! {
290     if #[cfg(not(target_os = "nto"))]
291     {
292         pub const PRIO_MIN: ::c_int = -20;
293         pub const PRIO_MAX: ::c_int = 20;
294     }
295 }
296 pub const IPPROTO_ICMP: ::c_int = 1;
297 pub const IPPROTO_ICMPV6: ::c_int = 58;
298 pub const IPPROTO_TCP: ::c_int = 6;
299 pub const IPPROTO_UDP: ::c_int = 17;
300 pub const IPPROTO_IP: ::c_int = 0;
301 pub const IPPROTO_IPV6: ::c_int = 41;
302 
303 pub const INADDR_LOOPBACK: in_addr_t = 2130706433;
304 pub const INADDR_ANY: in_addr_t = 0;
305 pub const INADDR_BROADCAST: in_addr_t = 4294967295;
306 pub const INADDR_NONE: in_addr_t = 4294967295;
307 
308 pub const ARPOP_REQUEST: u16 = 1;
309 pub const ARPOP_REPLY: u16 = 2;
310 
311 pub const ATF_COM: ::c_int = 0x02;
312 pub const ATF_PERM: ::c_int = 0x04;
313 pub const ATF_PUBL: ::c_int = 0x08;
314 pub const ATF_USETRAILERS: ::c_int = 0x10;
315 
316 extern "C" {
317     pub static in6addr_loopback: in6_addr;
318     pub static in6addr_any: in6_addr;
319 }
320 
321 cfg_if! {
322     if #[cfg(any(target_os = "l4re", target_os = "espidf"))] {
323         // required libraries for L4Re and the ESP-IDF framework are linked externally, ATM
324     } else if #[cfg(feature = "std")] {
325         // cargo build, don't pull in anything extra as the std dep
326         // already pulls in all libs.
327     } else if #[cfg(all(target_os = "linux",
328                         any(target_env = "gnu", target_env = "uclibc"),
329                         feature = "rustc-dep-of-std"))] {
330         #[link(name = "util", kind = "static", modifiers = "-bundle",
331             cfg(target_feature = "crt-static"))]
332         #[link(name = "rt", kind = "static", modifiers = "-bundle",
333             cfg(target_feature = "crt-static"))]
334         #[link(name = "pthread", kind = "static", modifiers = "-bundle",
335             cfg(target_feature = "crt-static"))]
336         #[link(name = "m", kind = "static", modifiers = "-bundle",
337             cfg(target_feature = "crt-static"))]
338         #[link(name = "dl", kind = "static", modifiers = "-bundle",
339             cfg(target_feature = "crt-static"))]
340         #[link(name = "c", kind = "static", modifiers = "-bundle",
341             cfg(target_feature = "crt-static"))]
342         #[link(name = "gcc_eh", kind = "static", modifiers = "-bundle",
343             cfg(target_feature = "crt-static"))]
344         #[link(name = "gcc", kind = "static", modifiers = "-bundle",
345             cfg(target_feature = "crt-static"))]
346         #[link(name = "c", kind = "static", modifiers = "-bundle",
347             cfg(target_feature = "crt-static"))]
348         #[link(name = "util", cfg(not(target_feature = "crt-static")))]
349         #[link(name = "rt", cfg(not(target_feature = "crt-static")))]
350         #[link(name = "pthread", cfg(not(target_feature = "crt-static")))]
351         #[link(name = "m", cfg(not(target_feature = "crt-static")))]
352         #[link(name = "dl", cfg(not(target_feature = "crt-static")))]
353         #[link(name = "c", cfg(not(target_feature = "crt-static")))]
354         extern {}
355     } else if #[cfg(any(target_env = "musl", target_env = "ohos"))] {
356         #[cfg_attr(feature = "rustc-dep-of-std",
357                    link(name = "c", kind = "static", modifiers = "-bundle",
358                         cfg(target_feature = "crt-static")))]
359         #[cfg_attr(feature = "rustc-dep-of-std",
360                    link(name = "c", cfg(not(target_feature = "crt-static"))))]
361         extern {}
362     } else if #[cfg(target_os = "emscripten")] {
363         #[link(name = "c")]
364         extern {}
365     } else if #[cfg(all(target_os = "android", feature = "rustc-dep-of-std"))] {
366         #[link(name = "c", kind = "static", modifiers = "-bundle",
367             cfg(target_feature = "crt-static"))]
368         #[link(name = "m", kind = "static", modifiers = "-bundle",
369             cfg(target_feature = "crt-static"))]
370         #[link(name = "m", cfg(not(target_feature = "crt-static")))]
371         #[link(name = "c", cfg(not(target_feature = "crt-static")))]
372         extern {}
373     } else if #[cfg(any(target_os = "macos",
374                         target_os = "ios",
375                         target_os = "tvos",
376                         target_os = "watchos",
377                         target_os = "visionos",
378                         target_os = "android",
379                         target_os = "openbsd",
380                         target_os = "nto",
381                     ))] {
382         #[link(name = "c")]
383         #[link(name = "m")]
384         extern {}
385     } else if #[cfg(target_os = "haiku")] {
386         #[link(name = "root")]
387         #[link(name = "network")]
388         extern {}
389     } else if #[cfg(target_env = "newlib")] {
390         #[link(name = "c")]
391         #[link(name = "m")]
392         extern {}
393     } else if #[cfg(target_env = "illumos")] {
394         #[link(name = "c")]
395         #[link(name = "m")]
396         extern {}
397     } else if #[cfg(target_os = "redox")] {
398         #[cfg_attr(feature = "rustc-dep-of-std",
399                    link(name = "c", kind = "static", modifiers = "-bundle",
400                         cfg(target_feature = "crt-static")))]
401         #[cfg_attr(feature = "rustc-dep-of-std",
402                    link(name = "c", cfg(not(target_feature = "crt-static"))))]
403         extern {}
404     } else if #[cfg(target_os = "aix")] {
405         #[link(name = "c")]
406         #[link(name = "m")]
407         #[link(name = "bsd")]
408         #[link(name = "pthread")]
409         extern {}
410     } else {
411         #[link(name = "c")]
412         #[link(name = "m")]
413         #[link(name = "rt")]
414         #[link(name = "pthread")]
415         extern {}
416     }
417 }
418 
419 missing! {
420     #[cfg_attr(feature = "extra_traits", derive(Debug))]
421     pub enum FILE {}
422     #[cfg_attr(feature = "extra_traits", derive(Debug))]
423     pub enum fpos_t {} // FIXME: fill this out with a struct
424 }
425 
426 extern "C" {
427     pub fn isalnum(c: c_int) -> c_int;
428     pub fn isalpha(c: c_int) -> c_int;
429     pub fn iscntrl(c: c_int) -> c_int;
430     pub fn isdigit(c: c_int) -> c_int;
431     pub fn isgraph(c: c_int) -> c_int;
432     pub fn islower(c: c_int) -> c_int;
433     pub fn isprint(c: c_int) -> c_int;
434     pub fn ispunct(c: c_int) -> c_int;
435     pub fn isspace(c: c_int) -> c_int;
436     pub fn isupper(c: c_int) -> c_int;
437     pub fn isxdigit(c: c_int) -> c_int;
438     pub fn isblank(c: c_int) -> c_int;
439     pub fn tolower(c: c_int) -> c_int;
440     pub fn toupper(c: c_int) -> c_int;
441     pub fn qsort(
442         base: *mut c_void,
443         num: size_t,
444         size: size_t,
445         compar: ::Option<unsafe extern "C" fn(*const c_void, *const c_void) -> c_int>,
446     );
447     pub fn bsearch(
448         key: *const c_void,
449         base: *const c_void,
450         num: size_t,
451         size: size_t,
452         compar: ::Option<unsafe extern "C" fn(*const c_void, *const c_void) -> c_int>,
453     ) -> *mut c_void;
454     #[cfg_attr(
455         all(target_os = "macos", target_arch = "x86"),
456         link_name = "fopen$UNIX2003"
457     )]
458     pub fn fopen(filename: *const c_char, mode: *const c_char) -> *mut FILE;
459     #[cfg_attr(
460         all(target_os = "macos", target_arch = "x86"),
461         link_name = "freopen$UNIX2003"
462     )]
463     pub fn freopen(filename: *const c_char, mode: *const c_char, file: *mut FILE) -> *mut FILE;
464 
465     pub fn fflush(file: *mut FILE) -> c_int;
466     pub fn fclose(file: *mut FILE) -> c_int;
467     pub fn remove(filename: *const c_char) -> c_int;
468     pub fn rename(oldname: *const c_char, newname: *const c_char) -> c_int;
469     pub fn tmpfile() -> *mut FILE;
470     pub fn setvbuf(stream: *mut FILE, buffer: *mut c_char, mode: c_int, size: size_t) -> c_int;
471     pub fn setbuf(stream: *mut FILE, buf: *mut c_char);
472     pub fn getchar() -> c_int;
473     pub fn putchar(c: c_int) -> c_int;
474     pub fn fgetc(stream: *mut FILE) -> c_int;
475     pub fn fgets(buf: *mut c_char, n: c_int, stream: *mut FILE) -> *mut c_char;
476     pub fn fputc(c: c_int, stream: *mut FILE) -> c_int;
477     #[cfg_attr(
478         all(target_os = "macos", target_arch = "x86"),
479         link_name = "fputs$UNIX2003"
480     )]
481     pub fn fputs(s: *const c_char, stream: *mut FILE) -> c_int;
482     pub fn puts(s: *const c_char) -> c_int;
483     pub fn ungetc(c: c_int, stream: *mut FILE) -> c_int;
484     pub fn fread(ptr: *mut c_void, size: size_t, nobj: size_t, stream: *mut FILE) -> size_t;
485     #[cfg_attr(
486         all(target_os = "macos", target_arch = "x86"),
487         link_name = "fwrite$UNIX2003"
488     )]
489     pub fn fwrite(ptr: *const c_void, size: size_t, nobj: size_t, stream: *mut FILE) -> size_t;
490     pub fn fseek(stream: *mut FILE, offset: c_long, whence: c_int) -> c_int;
491     pub fn ftell(stream: *mut FILE) -> c_long;
492     pub fn rewind(stream: *mut FILE);
493     #[cfg_attr(target_os = "netbsd", link_name = "__fgetpos50")]
494     pub fn fgetpos(stream: *mut FILE, ptr: *mut fpos_t) -> c_int;
495     #[cfg_attr(target_os = "netbsd", link_name = "__fsetpos50")]
496     pub fn fsetpos(stream: *mut FILE, ptr: *const fpos_t) -> c_int;
497     pub fn feof(stream: *mut FILE) -> c_int;
498     pub fn ferror(stream: *mut FILE) -> c_int;
499     pub fn clearerr(stream: *mut FILE);
500     pub fn perror(s: *const c_char);
501     pub fn atof(s: *const c_char) -> c_double;
502     pub fn atoi(s: *const c_char) -> c_int;
503     pub fn atol(s: *const c_char) -> c_long;
504     pub fn atoll(s: *const c_char) -> c_longlong;
505     #[cfg_attr(
506         all(target_os = "macos", target_arch = "x86"),
507         link_name = "strtod$UNIX2003"
508     )]
509     pub fn strtod(s: *const c_char, endp: *mut *mut c_char) -> c_double;
510     pub fn strtof(s: *const c_char, endp: *mut *mut c_char) -> c_float;
511     pub fn strtol(s: *const c_char, endp: *mut *mut c_char, base: c_int) -> c_long;
512     pub fn strtoll(s: *const c_char, endp: *mut *mut c_char, base: c_int) -> c_longlong;
513     pub fn strtoul(s: *const c_char, endp: *mut *mut c_char, base: c_int) -> c_ulong;
514     pub fn strtoull(s: *const c_char, endp: *mut *mut c_char, base: c_int) -> c_ulonglong;
515     pub fn calloc(nobj: size_t, size: size_t) -> *mut c_void;
516     pub fn malloc(size: size_t) -> *mut c_void;
517     pub fn realloc(p: *mut c_void, size: size_t) -> *mut c_void;
518     pub fn free(p: *mut c_void);
519     pub fn abort() -> !;
520     pub fn exit(status: c_int) -> !;
521     pub fn _exit(status: c_int) -> !;
522     #[cfg_attr(
523         all(target_os = "macos", target_arch = "x86"),
524         link_name = "system$UNIX2003"
525     )]
526     pub fn system(s: *const c_char) -> c_int;
527     pub fn getenv(s: *const c_char) -> *mut c_char;
528 
529     pub fn strcpy(dst: *mut c_char, src: *const c_char) -> *mut c_char;
530     pub fn strncpy(dst: *mut c_char, src: *const c_char, n: size_t) -> *mut c_char;
531     pub fn stpcpy(dst: *mut c_char, src: *const c_char) -> *mut c_char;
532     pub fn strcat(s: *mut c_char, ct: *const c_char) -> *mut c_char;
533     pub fn strncat(s: *mut c_char, ct: *const c_char, n: size_t) -> *mut c_char;
534     pub fn strcmp(cs: *const c_char, ct: *const c_char) -> c_int;
535     pub fn strncmp(cs: *const c_char, ct: *const c_char, n: size_t) -> c_int;
536     pub fn strcoll(cs: *const c_char, ct: *const c_char) -> c_int;
537     pub fn strchr(cs: *const c_char, c: c_int) -> *mut c_char;
538     pub fn strrchr(cs: *const c_char, c: c_int) -> *mut c_char;
539     pub fn strspn(cs: *const c_char, ct: *const c_char) -> size_t;
540     pub fn strcspn(cs: *const c_char, ct: *const c_char) -> size_t;
541     pub fn strdup(cs: *const c_char) -> *mut c_char;
542     pub fn strndup(cs: *const c_char, n: size_t) -> *mut c_char;
543     pub fn strpbrk(cs: *const c_char, ct: *const c_char) -> *mut c_char;
544     pub fn strstr(cs: *const c_char, ct: *const c_char) -> *mut c_char;
545     pub fn strcasecmp(s1: *const c_char, s2: *const c_char) -> c_int;
546     pub fn strncasecmp(s1: *const c_char, s2: *const c_char, n: size_t) -> c_int;
547     pub fn strlen(cs: *const c_char) -> size_t;
548     pub fn strnlen(cs: *const c_char, maxlen: size_t) -> size_t;
549     #[cfg_attr(
550         all(target_os = "macos", target_arch = "x86"),
551         link_name = "strerror$UNIX2003"
552     )]
553     pub fn strerror(n: c_int) -> *mut c_char;
554     pub fn strtok(s: *mut c_char, t: *const c_char) -> *mut c_char;
555     pub fn strtok_r(s: *mut c_char, t: *const c_char, p: *mut *mut c_char) -> *mut c_char;
556     pub fn strxfrm(s: *mut c_char, ct: *const c_char, n: size_t) -> size_t;
557     pub fn strsignal(sig: c_int) -> *mut c_char;
558     pub fn wcslen(buf: *const wchar_t) -> size_t;
559     pub fn wcstombs(dest: *mut c_char, src: *const wchar_t, n: size_t) -> ::size_t;
560 
561     pub fn memchr(cx: *const c_void, c: c_int, n: size_t) -> *mut c_void;
562     pub fn wmemchr(cx: *const wchar_t, c: wchar_t, n: size_t) -> *mut wchar_t;
563     pub fn memcmp(cx: *const c_void, ct: *const c_void, n: size_t) -> c_int;
564     pub fn memcpy(dest: *mut c_void, src: *const c_void, n: size_t) -> *mut c_void;
565     pub fn memmove(dest: *mut c_void, src: *const c_void, n: size_t) -> *mut c_void;
566     pub fn memset(dest: *mut c_void, c: c_int, n: size_t) -> *mut c_void;
567 }
568 
569 extern "C" {
570     #[cfg_attr(target_os = "netbsd", link_name = "__getpwnam50")]
571     pub fn getpwnam(name: *const ::c_char) -> *mut passwd;
572     #[cfg_attr(target_os = "netbsd", link_name = "__getpwuid50")]
573     pub fn getpwuid(uid: ::uid_t) -> *mut passwd;
574 
575     pub fn fprintf(stream: *mut ::FILE, format: *const ::c_char, ...) -> ::c_int;
576     pub fn printf(format: *const ::c_char, ...) -> ::c_int;
577     pub fn snprintf(s: *mut ::c_char, n: ::size_t, format: *const ::c_char, ...) -> ::c_int;
578     pub fn sprintf(s: *mut ::c_char, format: *const ::c_char, ...) -> ::c_int;
579     #[cfg_attr(
580         all(target_os = "linux", not(target_env = "uclibc")),
581         link_name = "__isoc99_fscanf"
582     )]
583     pub fn fscanf(stream: *mut ::FILE, format: *const ::c_char, ...) -> ::c_int;
584     #[cfg_attr(
585         all(target_os = "linux", not(target_env = "uclibc")),
586         link_name = "__isoc99_scanf"
587     )]
588     pub fn scanf(format: *const ::c_char, ...) -> ::c_int;
589     #[cfg_attr(
590         all(target_os = "linux", not(target_env = "uclibc")),
591         link_name = "__isoc99_sscanf"
592     )]
593     pub fn sscanf(s: *const ::c_char, format: *const ::c_char, ...) -> ::c_int;
594     pub fn getchar_unlocked() -> ::c_int;
595     pub fn putchar_unlocked(c: ::c_int) -> ::c_int;
596 
597     #[cfg(not(all(
598         libc_cfg_target_vendor,
599         target_arch = "powerpc",
600         target_vendor = "nintendo"
601     )))]
602     #[cfg_attr(target_os = "netbsd", link_name = "__socket30")]
603     #[cfg_attr(
604         any(target_os = "illumos", target_os = "solaris"),
605         link_name = "__xnet_socket"
606     )]
607     #[cfg_attr(target_os = "espidf", link_name = "lwip_socket")]
608     pub fn socket(domain: ::c_int, ty: ::c_int, protocol: ::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 = "connect$UNIX2003"
617     )]
618     #[cfg_attr(
619         any(target_os = "illumos", target_os = "solaris"),
620         link_name = "__xnet_connect"
621     )]
622     #[cfg_attr(target_os = "espidf", link_name = "lwip_connect")]
623     pub fn connect(socket: ::c_int, address: *const sockaddr, len: socklen_t) -> ::c_int;
624     #[cfg_attr(
625         all(target_os = "macos", target_arch = "x86"),
626         link_name = "listen$UNIX2003"
627     )]
628     #[cfg_attr(target_os = "espidf", link_name = "lwip_listen")]
629     pub fn listen(socket: ::c_int, backlog: ::c_int) -> ::c_int;
630     #[cfg(not(all(
631         libc_cfg_target_vendor,
632         target_arch = "powerpc",
633         target_vendor = "nintendo"
634     )))]
635     #[cfg_attr(
636         all(target_os = "macos", target_arch = "x86"),
637         link_name = "accept$UNIX2003"
638     )]
639     #[cfg_attr(target_os = "espidf", link_name = "lwip_accept")]
640     pub fn accept(socket: ::c_int, address: *mut sockaddr, address_len: *mut socklen_t) -> ::c_int;
641     #[cfg(not(all(
642         libc_cfg_target_vendor,
643         target_arch = "powerpc",
644         target_vendor = "nintendo"
645     )))]
646     #[cfg_attr(
647         all(target_os = "macos", target_arch = "x86"),
648         link_name = "getpeername$UNIX2003"
649     )]
650     #[cfg_attr(target_os = "espidf", link_name = "lwip_getpeername")]
651     pub fn getpeername(
652         socket: ::c_int,
653         address: *mut sockaddr,
654         address_len: *mut socklen_t,
655     ) -> ::c_int;
656     #[cfg(not(all(
657         libc_cfg_target_vendor,
658         target_arch = "powerpc",
659         target_vendor = "nintendo"
660     )))]
661     #[cfg_attr(
662         all(target_os = "macos", target_arch = "x86"),
663         link_name = "getsockname$UNIX2003"
664     )]
665     #[cfg_attr(target_os = "espidf", link_name = "lwip_getsockname")]
666     pub fn getsockname(
667         socket: ::c_int,
668         address: *mut sockaddr,
669         address_len: *mut socklen_t,
670     ) -> ::c_int;
671     #[cfg_attr(target_os = "espidf", link_name = "lwip_setsockopt")]
672     pub fn setsockopt(
673         socket: ::c_int,
674         level: ::c_int,
675         name: ::c_int,
676         value: *const ::c_void,
677         option_len: socklen_t,
678     ) -> ::c_int;
679     #[cfg_attr(
680         all(target_os = "macos", target_arch = "x86"),
681         link_name = "socketpair$UNIX2003"
682     )]
683     #[cfg_attr(
684         any(target_os = "illumos", target_os = "solaris"),
685         link_name = "__xnet_socketpair"
686     )]
687     pub fn socketpair(
688         domain: ::c_int,
689         type_: ::c_int,
690         protocol: ::c_int,
691         socket_vector: *mut ::c_int,
692     ) -> ::c_int;
693     #[cfg(not(all(
694         libc_cfg_target_vendor,
695         target_arch = "powerpc",
696         target_vendor = "nintendo"
697     )))]
698     #[cfg_attr(
699         all(target_os = "macos", target_arch = "x86"),
700         link_name = "sendto$UNIX2003"
701     )]
702     #[cfg_attr(
703         any(target_os = "illumos", target_os = "solaris"),
704         link_name = "__xnet_sendto"
705     )]
706     #[cfg_attr(target_os = "espidf", link_name = "lwip_sendto")]
707     pub fn sendto(
708         socket: ::c_int,
709         buf: *const ::c_void,
710         len: ::size_t,
711         flags: ::c_int,
712         addr: *const sockaddr,
713         addrlen: socklen_t,
714     ) -> ::ssize_t;
715     #[cfg_attr(target_os = "espidf", link_name = "lwip_shutdown")]
716     pub fn shutdown(socket: ::c_int, how: ::c_int) -> ::c_int;
717 
718     #[cfg_attr(
719         all(target_os = "macos", target_arch = "x86"),
720         link_name = "chmod$UNIX2003"
721     )]
722     pub fn chmod(path: *const c_char, mode: mode_t) -> ::c_int;
723     #[cfg_attr(
724         all(target_os = "macos", target_arch = "x86"),
725         link_name = "fchmod$UNIX2003"
726     )]
727     pub fn fchmod(fd: ::c_int, mode: mode_t) -> ::c_int;
728 
729     #[cfg_attr(
730         all(target_os = "macos", not(target_arch = "aarch64")),
731         link_name = "fstat$INODE64"
732     )]
733     #[cfg_attr(target_os = "netbsd", link_name = "__fstat50")]
734     #[cfg_attr(
735         all(target_os = "freebsd", any(freebsd11, freebsd10)),
736         link_name = "fstat@FBSD_1.0"
737     )]
738     pub fn fstat(fildes: ::c_int, buf: *mut stat) -> ::c_int;
739 
740     pub fn mkdir(path: *const c_char, mode: mode_t) -> ::c_int;
741 
742     #[cfg_attr(
743         all(target_os = "macos", not(target_arch = "aarch64")),
744         link_name = "stat$INODE64"
745     )]
746     #[cfg_attr(target_os = "netbsd", link_name = "__stat50")]
747     #[cfg_attr(
748         all(target_os = "freebsd", any(freebsd11, freebsd10)),
749         link_name = "stat@FBSD_1.0"
750     )]
751     pub fn stat(path: *const c_char, buf: *mut stat) -> ::c_int;
752 
753     pub fn pclose(stream: *mut ::FILE) -> ::c_int;
754     #[cfg_attr(
755         all(target_os = "macos", target_arch = "x86"),
756         link_name = "fdopen$UNIX2003"
757     )]
758     pub fn fdopen(fd: ::c_int, mode: *const c_char) -> *mut ::FILE;
759     pub fn fileno(stream: *mut ::FILE) -> ::c_int;
760 
761     #[cfg_attr(
762         all(target_os = "macos", target_arch = "x86"),
763         link_name = "open$UNIX2003"
764     )]
765     pub fn open(path: *const c_char, oflag: ::c_int, ...) -> ::c_int;
766     #[cfg_attr(
767         all(target_os = "macos", target_arch = "x86"),
768         link_name = "creat$UNIX2003"
769     )]
770     pub fn creat(path: *const c_char, mode: mode_t) -> ::c_int;
771     #[cfg_attr(
772         all(target_os = "macos", target_arch = "x86"),
773         link_name = "fcntl$UNIX2003"
774     )]
775     pub fn fcntl(fd: ::c_int, cmd: ::c_int, ...) -> ::c_int;
776 
777     #[cfg_attr(
778         all(target_os = "macos", target_arch = "x86_64"),
779         link_name = "opendir$INODE64"
780     )]
781     #[cfg_attr(
782         all(target_os = "macos", target_arch = "x86"),
783         link_name = "opendir$INODE64$UNIX2003"
784     )]
785     #[cfg_attr(target_os = "netbsd", link_name = "__opendir30")]
786     pub fn opendir(dirname: *const c_char) -> *mut ::DIR;
787 
788     #[cfg_attr(
789         all(target_os = "macos", not(target_arch = "aarch64")),
790         link_name = "readdir$INODE64"
791     )]
792     #[cfg_attr(target_os = "netbsd", link_name = "__readdir30")]
793     #[cfg_attr(
794         all(target_os = "freebsd", any(freebsd11, freebsd10)),
795         link_name = "readdir@FBSD_1.0"
796     )]
797     pub fn readdir(dirp: *mut ::DIR) -> *mut ::dirent;
798     #[cfg_attr(
799         all(target_os = "macos", target_arch = "x86"),
800         link_name = "closedir$UNIX2003"
801     )]
802     pub fn closedir(dirp: *mut ::DIR) -> ::c_int;
803     #[cfg_attr(
804         all(target_os = "macos", target_arch = "x86_64"),
805         link_name = "rewinddir$INODE64"
806     )]
807     #[cfg_attr(
808         all(target_os = "macos", target_arch = "x86"),
809         link_name = "rewinddir$INODE64$UNIX2003"
810     )]
811     pub fn rewinddir(dirp: *mut ::DIR);
812 
813     pub fn fchmodat(
814         dirfd: ::c_int,
815         pathname: *const ::c_char,
816         mode: ::mode_t,
817         flags: ::c_int,
818     ) -> ::c_int;
819     pub fn fchown(fd: ::c_int, owner: ::uid_t, group: ::gid_t) -> ::c_int;
820     pub fn fchownat(
821         dirfd: ::c_int,
822         pathname: *const ::c_char,
823         owner: ::uid_t,
824         group: ::gid_t,
825         flags: ::c_int,
826     ) -> ::c_int;
827     #[cfg_attr(
828         all(target_os = "macos", not(target_arch = "aarch64")),
829         link_name = "fstatat$INODE64"
830     )]
831     #[cfg_attr(
832         all(target_os = "freebsd", any(freebsd11, freebsd10)),
833         link_name = "fstatat@FBSD_1.1"
834     )]
835     pub fn fstatat(
836         dirfd: ::c_int,
837         pathname: *const ::c_char,
838         buf: *mut stat,
839         flags: ::c_int,
840     ) -> ::c_int;
841     pub fn linkat(
842         olddirfd: ::c_int,
843         oldpath: *const ::c_char,
844         newdirfd: ::c_int,
845         newpath: *const ::c_char,
846         flags: ::c_int,
847     ) -> ::c_int;
848     pub fn renameat(
849         olddirfd: ::c_int,
850         oldpath: *const ::c_char,
851         newdirfd: ::c_int,
852         newpath: *const ::c_char,
853     ) -> ::c_int;
854     pub fn symlinkat(
855         target: *const ::c_char,
856         newdirfd: ::c_int,
857         linkpath: *const ::c_char,
858     ) -> ::c_int;
859     pub fn unlinkat(dirfd: ::c_int, pathname: *const ::c_char, flags: ::c_int) -> ::c_int;
860 
861     pub fn access(path: *const c_char, amode: ::c_int) -> ::c_int;
862     pub fn alarm(seconds: ::c_uint) -> ::c_uint;
863     pub fn chdir(dir: *const c_char) -> ::c_int;
864     pub fn fchdir(dirfd: ::c_int) -> ::c_int;
865     pub fn chown(path: *const c_char, uid: uid_t, gid: gid_t) -> ::c_int;
866     #[cfg_attr(
867         all(target_os = "macos", target_arch = "x86"),
868         link_name = "lchown$UNIX2003"
869     )]
870     pub fn lchown(path: *const c_char, uid: uid_t, gid: gid_t) -> ::c_int;
871     #[cfg_attr(
872         all(target_os = "macos", target_arch = "x86"),
873         link_name = "close$NOCANCEL$UNIX2003"
874     )]
875     #[cfg_attr(
876         all(target_os = "macos", target_arch = "x86_64"),
877         link_name = "close$NOCANCEL"
878     )]
879     pub fn close(fd: ::c_int) -> ::c_int;
880     pub fn dup(fd: ::c_int) -> ::c_int;
881     pub fn dup2(src: ::c_int, dst: ::c_int) -> ::c_int;
882     pub fn execl(path: *const c_char, arg0: *const c_char, ...) -> ::c_int;
883     pub fn execle(path: *const ::c_char, arg0: *const ::c_char, ...) -> ::c_int;
884     pub fn execlp(file: *const ::c_char, arg0: *const ::c_char, ...) -> ::c_int;
885     pub fn execv(prog: *const c_char, argv: *const *const c_char) -> ::c_int;
886     pub fn execve(
887         prog: *const c_char,
888         argv: *const *const c_char,
889         envp: *const *const c_char,
890     ) -> ::c_int;
891     pub fn execvp(c: *const c_char, argv: *const *const c_char) -> ::c_int;
892     pub fn fork() -> pid_t;
893     pub fn fpathconf(filedes: ::c_int, name: ::c_int) -> c_long;
894     pub fn getcwd(buf: *mut c_char, size: ::size_t) -> *mut c_char;
895     pub fn getegid() -> gid_t;
896     pub fn geteuid() -> uid_t;
897     pub fn getgid() -> gid_t;
898     pub fn getgroups(ngroups_max: ::c_int, groups: *mut gid_t) -> ::c_int;
899     #[cfg_attr(target_os = "illumos", link_name = "getloginx")]
900     pub fn getlogin() -> *mut c_char;
901     #[cfg_attr(
902         all(target_os = "macos", target_arch = "x86"),
903         link_name = "getopt$UNIX2003"
904     )]
905     pub fn getopt(argc: ::c_int, argv: *const *mut c_char, optstr: *const c_char) -> ::c_int;
906     pub fn getpgid(pid: pid_t) -> pid_t;
907     pub fn getpgrp() -> pid_t;
908     pub fn getpid() -> pid_t;
909     pub fn getppid() -> pid_t;
910     pub fn getuid() -> uid_t;
911     pub fn isatty(fd: ::c_int) -> ::c_int;
912     pub fn link(src: *const c_char, dst: *const c_char) -> ::c_int;
913     pub fn lseek(fd: ::c_int, offset: off_t, whence: ::c_int) -> off_t;
914     pub fn pathconf(path: *const c_char, name: ::c_int) -> c_long;
915     pub fn pipe(fds: *mut ::c_int) -> ::c_int;
916     pub fn posix_memalign(memptr: *mut *mut ::c_void, align: ::size_t, size: ::size_t) -> ::c_int;
917     #[cfg_attr(
918         all(target_os = "macos", target_arch = "x86"),
919         link_name = "read$UNIX2003"
920     )]
921     pub fn read(fd: ::c_int, buf: *mut ::c_void, count: ::size_t) -> ::ssize_t;
922     pub fn rmdir(path: *const c_char) -> ::c_int;
923     pub fn seteuid(uid: uid_t) -> ::c_int;
924     pub fn setegid(gid: gid_t) -> ::c_int;
925     pub fn setgid(gid: gid_t) -> ::c_int;
926     pub fn setpgid(pid: pid_t, pgid: pid_t) -> ::c_int;
927     pub fn setsid() -> pid_t;
928     pub fn setuid(uid: uid_t) -> ::c_int;
929     pub fn setreuid(ruid: uid_t, euid: uid_t) -> ::c_int;
930     pub fn setregid(rgid: gid_t, egid: gid_t) -> ::c_int;
931     #[cfg_attr(
932         all(target_os = "macos", target_arch = "x86"),
933         link_name = "sleep$UNIX2003"
934     )]
935     pub fn sleep(secs: ::c_uint) -> ::c_uint;
936     #[cfg_attr(
937         all(target_os = "macos", target_arch = "x86"),
938         link_name = "nanosleep$UNIX2003"
939     )]
940     #[cfg_attr(target_os = "netbsd", link_name = "__nanosleep50")]
941     pub fn nanosleep(rqtp: *const timespec, rmtp: *mut timespec) -> ::c_int;
942     pub fn tcgetpgrp(fd: ::c_int) -> pid_t;
943     pub fn tcsetpgrp(fd: ::c_int, pgrp: ::pid_t) -> ::c_int;
944     pub fn ttyname(fd: ::c_int) -> *mut c_char;
945     #[cfg_attr(
946         all(target_os = "macos", target_arch = "x86"),
947         link_name = "ttyname_r$UNIX2003"
948     )]
949     #[cfg_attr(target_os = "illumos", link_name = "__posix_ttyname_r")]
950     pub fn ttyname_r(fd: ::c_int, buf: *mut c_char, buflen: ::size_t) -> ::c_int;
951     pub fn unlink(c: *const c_char) -> ::c_int;
952     #[cfg_attr(
953         all(target_os = "macos", target_arch = "x86"),
954         link_name = "wait$UNIX2003"
955     )]
956     pub fn wait(status: *mut ::c_int) -> pid_t;
957     #[cfg_attr(
958         all(target_os = "macos", target_arch = "x86"),
959         link_name = "waitpid$UNIX2003"
960     )]
961     pub fn waitpid(pid: pid_t, status: *mut ::c_int, options: ::c_int) -> pid_t;
962     #[cfg_attr(
963         all(target_os = "macos", target_arch = "x86"),
964         link_name = "write$UNIX2003"
965     )]
966     pub fn write(fd: ::c_int, buf: *const ::c_void, count: ::size_t) -> ::ssize_t;
967     #[cfg_attr(
968         all(target_os = "macos", target_arch = "x86"),
969         link_name = "pread$UNIX2003"
970     )]
971     pub fn pread(fd: ::c_int, buf: *mut ::c_void, count: ::size_t, offset: off_t) -> ::ssize_t;
972     #[cfg_attr(
973         all(target_os = "macos", target_arch = "x86"),
974         link_name = "pwrite$UNIX2003"
975     )]
976     pub fn pwrite(fd: ::c_int, buf: *const ::c_void, count: ::size_t, offset: off_t) -> ::ssize_t;
977     pub fn umask(mask: mode_t) -> mode_t;
978 
979     #[cfg_attr(target_os = "netbsd", link_name = "__utime50")]
980     pub fn utime(file: *const c_char, buf: *const utimbuf) -> ::c_int;
981 
982     #[cfg_attr(
983         all(target_os = "macos", target_arch = "x86"),
984         link_name = "kill$UNIX2003"
985     )]
986     pub fn kill(pid: pid_t, sig: ::c_int) -> ::c_int;
987     #[cfg_attr(
988         all(target_os = "macos", target_arch = "x86"),
989         link_name = "killpg$UNIX2003"
990     )]
991     pub fn killpg(pgrp: pid_t, sig: ::c_int) -> ::c_int;
992 
993     pub fn mlock(addr: *const ::c_void, len: ::size_t) -> ::c_int;
994     pub fn munlock(addr: *const ::c_void, len: ::size_t) -> ::c_int;
995     pub fn mlockall(flags: ::c_int) -> ::c_int;
996     pub fn munlockall() -> ::c_int;
997 
998     #[cfg_attr(
999         all(target_os = "macos", target_arch = "x86"),
1000         link_name = "mmap$UNIX2003"
1001     )]
1002     pub fn mmap(
1003         addr: *mut ::c_void,
1004         len: ::size_t,
1005         prot: ::c_int,
1006         flags: ::c_int,
1007         fd: ::c_int,
1008         offset: off_t,
1009     ) -> *mut ::c_void;
1010     #[cfg_attr(
1011         all(target_os = "macos", target_arch = "x86"),
1012         link_name = "munmap$UNIX2003"
1013     )]
1014     pub fn munmap(addr: *mut ::c_void, len: ::size_t) -> ::c_int;
1015 
1016     pub fn if_nametoindex(ifname: *const c_char) -> ::c_uint;
1017     pub fn if_indextoname(ifindex: ::c_uint, ifname: *mut ::c_char) -> *mut ::c_char;
1018 
1019     #[cfg_attr(
1020         all(target_os = "macos", not(target_arch = "aarch64")),
1021         link_name = "lstat$INODE64"
1022     )]
1023     #[cfg_attr(target_os = "netbsd", link_name = "__lstat50")]
1024     #[cfg_attr(
1025         all(target_os = "freebsd", any(freebsd11, freebsd10)),
1026         link_name = "lstat@FBSD_1.0"
1027     )]
1028     pub fn lstat(path: *const c_char, buf: *mut stat) -> ::c_int;
1029 
1030     #[cfg_attr(
1031         all(target_os = "macos", target_arch = "x86"),
1032         link_name = "fsync$UNIX2003"
1033     )]
1034     pub fn fsync(fd: ::c_int) -> ::c_int;
1035 
1036     #[cfg_attr(
1037         all(target_os = "macos", target_arch = "x86"),
1038         link_name = "setenv$UNIX2003"
1039     )]
1040     pub fn setenv(name: *const c_char, val: *const c_char, overwrite: ::c_int) -> ::c_int;
1041     #[cfg_attr(
1042         all(target_os = "macos", target_arch = "x86"),
1043         link_name = "unsetenv$UNIX2003"
1044     )]
1045     #[cfg_attr(target_os = "netbsd", link_name = "__unsetenv13")]
1046     pub fn unsetenv(name: *const c_char) -> ::c_int;
1047 
1048     pub fn symlink(path1: *const c_char, path2: *const c_char) -> ::c_int;
1049 
1050     pub fn truncate(path: *const c_char, length: off_t) -> ::c_int;
1051     pub fn ftruncate(fd: ::c_int, length: off_t) -> ::c_int;
1052 
1053     pub fn signal(signum: ::c_int, handler: sighandler_t) -> sighandler_t;
1054 
1055     #[cfg_attr(target_os = "netbsd", link_name = "__getrusage50")]
1056     pub fn getrusage(resource: ::c_int, usage: *mut rusage) -> ::c_int;
1057 
1058     #[cfg_attr(
1059         any(
1060             target_os = "macos",
1061             target_os = "ios",
1062             target_os = "tvos",
1063             target_os = "watchos",
1064             target_os = "visionos"
1065         ),
1066         link_name = "realpath$DARWIN_EXTSN"
1067     )]
1068     pub fn realpath(pathname: *const ::c_char, resolved: *mut ::c_char) -> *mut ::c_char;
1069 
1070     pub fn flock(fd: ::c_int, operation: ::c_int) -> ::c_int;
1071 
1072     #[cfg_attr(target_os = "netbsd", link_name = "__times13")]
1073     pub fn times(buf: *mut ::tms) -> ::clock_t;
1074 
1075     pub fn pthread_self() -> ::pthread_t;
1076     pub fn pthread_equal(t1: ::pthread_t, t2: ::pthread_t) -> ::c_int;
1077     #[cfg_attr(
1078         all(target_os = "macos", target_arch = "x86"),
1079         link_name = "pthread_join$UNIX2003"
1080     )]
1081     pub fn pthread_join(native: ::pthread_t, value: *mut *mut ::c_void) -> ::c_int;
1082     pub fn pthread_exit(value: *mut ::c_void) -> !;
1083     pub fn pthread_attr_init(attr: *mut ::pthread_attr_t) -> ::c_int;
1084     pub fn pthread_attr_destroy(attr: *mut ::pthread_attr_t) -> ::c_int;
1085     pub fn pthread_attr_getstacksize(
1086         attr: *const ::pthread_attr_t,
1087         stacksize: *mut ::size_t,
1088     ) -> ::c_int;
1089     pub fn pthread_attr_setstacksize(attr: *mut ::pthread_attr_t, stack_size: ::size_t) -> ::c_int;
1090     pub fn pthread_attr_setdetachstate(attr: *mut ::pthread_attr_t, state: ::c_int) -> ::c_int;
1091     pub fn pthread_detach(thread: ::pthread_t) -> ::c_int;
1092     #[cfg_attr(target_os = "netbsd", link_name = "__libc_thr_yield")]
1093     pub fn sched_yield() -> ::c_int;
1094     pub fn pthread_key_create(
1095         key: *mut pthread_key_t,
1096         dtor: ::Option<unsafe extern "C" fn(*mut ::c_void)>,
1097     ) -> ::c_int;
1098     pub fn pthread_key_delete(key: pthread_key_t) -> ::c_int;
1099     pub fn pthread_getspecific(key: pthread_key_t) -> *mut ::c_void;
1100     pub fn pthread_setspecific(key: pthread_key_t, value: *const ::c_void) -> ::c_int;
1101     pub fn pthread_mutex_init(
1102         lock: *mut pthread_mutex_t,
1103         attr: *const pthread_mutexattr_t,
1104     ) -> ::c_int;
1105     pub fn pthread_mutex_destroy(lock: *mut pthread_mutex_t) -> ::c_int;
1106     pub fn pthread_mutex_lock(lock: *mut pthread_mutex_t) -> ::c_int;
1107     pub fn pthread_mutex_trylock(lock: *mut pthread_mutex_t) -> ::c_int;
1108     pub fn pthread_mutex_unlock(lock: *mut pthread_mutex_t) -> ::c_int;
1109 
1110     pub fn pthread_mutexattr_init(attr: *mut pthread_mutexattr_t) -> ::c_int;
1111     #[cfg_attr(
1112         all(target_os = "macos", target_arch = "x86"),
1113         link_name = "pthread_mutexattr_destroy$UNIX2003"
1114     )]
1115     pub fn pthread_mutexattr_destroy(attr: *mut pthread_mutexattr_t) -> ::c_int;
1116     pub fn pthread_mutexattr_settype(attr: *mut pthread_mutexattr_t, _type: ::c_int) -> ::c_int;
1117 
1118     #[cfg_attr(
1119         all(target_os = "macos", target_arch = "x86"),
1120         link_name = "pthread_cond_init$UNIX2003"
1121     )]
1122     pub fn pthread_cond_init(cond: *mut pthread_cond_t, attr: *const pthread_condattr_t)
1123         -> ::c_int;
1124     #[cfg_attr(
1125         all(target_os = "macos", target_arch = "x86"),
1126         link_name = "pthread_cond_wait$UNIX2003"
1127     )]
1128     pub fn pthread_cond_wait(cond: *mut pthread_cond_t, lock: *mut pthread_mutex_t) -> ::c_int;
1129     #[cfg_attr(
1130         all(target_os = "macos", target_arch = "x86"),
1131         link_name = "pthread_cond_timedwait$UNIX2003"
1132     )]
1133     pub fn pthread_cond_timedwait(
1134         cond: *mut pthread_cond_t,
1135         lock: *mut pthread_mutex_t,
1136         abstime: *const ::timespec,
1137     ) -> ::c_int;
1138     pub fn pthread_cond_signal(cond: *mut pthread_cond_t) -> ::c_int;
1139     pub fn pthread_cond_broadcast(cond: *mut pthread_cond_t) -> ::c_int;
1140     pub fn pthread_cond_destroy(cond: *mut pthread_cond_t) -> ::c_int;
1141     pub fn pthread_condattr_init(attr: *mut pthread_condattr_t) -> ::c_int;
1142     pub fn pthread_condattr_destroy(attr: *mut pthread_condattr_t) -> ::c_int;
1143     #[cfg_attr(
1144         all(target_os = "macos", target_arch = "x86"),
1145         link_name = "pthread_rwlock_init$UNIX2003"
1146     )]
1147     pub fn pthread_rwlock_init(
1148         lock: *mut pthread_rwlock_t,
1149         attr: *const pthread_rwlockattr_t,
1150     ) -> ::c_int;
1151     #[cfg_attr(
1152         all(target_os = "macos", target_arch = "x86"),
1153         link_name = "pthread_rwlock_destroy$UNIX2003"
1154     )]
1155     pub fn pthread_rwlock_destroy(lock: *mut pthread_rwlock_t) -> ::c_int;
1156     #[cfg_attr(
1157         all(target_os = "macos", target_arch = "x86"),
1158         link_name = "pthread_rwlock_rdlock$UNIX2003"
1159     )]
1160     pub fn pthread_rwlock_rdlock(lock: *mut pthread_rwlock_t) -> ::c_int;
1161     #[cfg_attr(
1162         all(target_os = "macos", target_arch = "x86"),
1163         link_name = "pthread_rwlock_tryrdlock$UNIX2003"
1164     )]
1165     pub fn pthread_rwlock_tryrdlock(lock: *mut pthread_rwlock_t) -> ::c_int;
1166     #[cfg_attr(
1167         all(target_os = "macos", target_arch = "x86"),
1168         link_name = "pthread_rwlock_wrlock$UNIX2003"
1169     )]
1170     pub fn pthread_rwlock_wrlock(lock: *mut pthread_rwlock_t) -> ::c_int;
1171     #[cfg_attr(
1172         all(target_os = "macos", target_arch = "x86"),
1173         link_name = "pthread_rwlock_trywrlock$UNIX2003"
1174     )]
1175     pub fn pthread_rwlock_trywrlock(lock: *mut pthread_rwlock_t) -> ::c_int;
1176     #[cfg_attr(
1177         all(target_os = "macos", target_arch = "x86"),
1178         link_name = "pthread_rwlock_unlock$UNIX2003"
1179     )]
1180     pub fn pthread_rwlock_unlock(lock: *mut pthread_rwlock_t) -> ::c_int;
1181     pub fn pthread_rwlockattr_init(attr: *mut pthread_rwlockattr_t) -> ::c_int;
1182     pub fn pthread_rwlockattr_destroy(attr: *mut pthread_rwlockattr_t) -> ::c_int;
1183 
1184     #[cfg_attr(
1185         any(target_os = "illumos", target_os = "solaris"),
1186         link_name = "__xnet_getsockopt"
1187     )]
1188     #[cfg_attr(target_os = "espidf", link_name = "lwip_getsockopt")]
1189     pub fn getsockopt(
1190         sockfd: ::c_int,
1191         level: ::c_int,
1192         optname: ::c_int,
1193         optval: *mut ::c_void,
1194         optlen: *mut ::socklen_t,
1195     ) -> ::c_int;
1196     pub fn raise(signum: ::c_int) -> ::c_int;
1197 
1198     #[cfg_attr(target_os = "netbsd", link_name = "__utimes50")]
1199     pub fn utimes(filename: *const ::c_char, times: *const ::timeval) -> ::c_int;
1200     pub fn dlopen(filename: *const ::c_char, flag: ::c_int) -> *mut ::c_void;
1201     pub fn dlerror() -> *mut ::c_char;
1202     pub fn dlsym(handle: *mut ::c_void, symbol: *const ::c_char) -> *mut ::c_void;
1203     pub fn dlclose(handle: *mut ::c_void) -> ::c_int;
1204 
1205     #[cfg(not(all(
1206         libc_cfg_target_vendor,
1207         target_arch = "powerpc",
1208         target_vendor = "nintendo"
1209     )))]
1210     #[cfg_attr(
1211         any(target_os = "illumos", target_os = "solaris"),
1212         link_name = "__xnet_getaddrinfo"
1213     )]
1214     #[cfg_attr(target_os = "espidf", link_name = "lwip_getaddrinfo")]
1215     pub fn getaddrinfo(
1216         node: *const c_char,
1217         service: *const c_char,
1218         hints: *const addrinfo,
1219         res: *mut *mut addrinfo,
1220     ) -> ::c_int;
1221     #[cfg(not(all(
1222         libc_cfg_target_vendor,
1223         target_arch = "powerpc",
1224         target_vendor = "nintendo"
1225     )))]
1226     #[cfg_attr(target_os = "espidf", link_name = "lwip_freeaddrinfo")]
1227     pub fn freeaddrinfo(res: *mut addrinfo);
1228     pub fn hstrerror(errcode: ::c_int) -> *const ::c_char;
1229     pub fn gai_strerror(errcode: ::c_int) -> *const ::c_char;
1230     #[cfg_attr(
1231         any(
1232             all(
1233                 target_os = "linux",
1234                 not(any(target_env = "musl", target_env = "ohos"))
1235             ),
1236             target_os = "freebsd",
1237             target_os = "dragonfly",
1238             target_os = "haiku"
1239         ),
1240         link_name = "__res_init"
1241     )]
1242     #[cfg_attr(
1243         any(
1244             target_os = "macos",
1245             target_os = "ios",
1246             target_os = "tvos",
1247             target_os = "watchos",
1248             target_os = "visionos"
1249         ),
1250         link_name = "res_9_init"
1251     )]
1252     pub fn res_init() -> ::c_int;
1253 
1254     #[cfg_attr(target_os = "netbsd", link_name = "__gmtime_r50")]
1255     #[cfg_attr(any(target_env = "musl", target_env = "ohos"), allow(deprecated))]
1256     // FIXME: for `time_t`
1257     pub fn gmtime_r(time_p: *const time_t, result: *mut tm) -> *mut tm;
1258     #[cfg_attr(target_os = "netbsd", link_name = "__localtime_r50")]
1259     #[cfg_attr(any(target_env = "musl", target_env = "ohos"), allow(deprecated))]
1260     // FIXME: for `time_t`
1261     pub fn localtime_r(time_p: *const time_t, result: *mut tm) -> *mut tm;
1262     #[cfg_attr(
1263         all(target_os = "macos", target_arch = "x86"),
1264         link_name = "mktime$UNIX2003"
1265     )]
1266     #[cfg_attr(target_os = "netbsd", link_name = "__mktime50")]
1267     #[cfg_attr(any(target_env = "musl", target_env = "ohos"), allow(deprecated))]
1268     // FIXME: for `time_t`
1269     pub fn mktime(tm: *mut tm) -> time_t;
1270     #[cfg_attr(target_os = "netbsd", link_name = "__time50")]
1271     #[cfg_attr(any(target_env = "musl", target_env = "ohos"), allow(deprecated))]
1272     // FIXME: for `time_t`
1273     pub fn time(time: *mut time_t) -> time_t;
1274     #[cfg_attr(target_os = "netbsd", link_name = "__gmtime50")]
1275     #[cfg_attr(any(target_env = "musl", target_env = "ohos"), allow(deprecated))]
1276     // FIXME: for `time_t`
1277     pub fn gmtime(time_p: *const time_t) -> *mut tm;
1278     #[cfg_attr(target_os = "netbsd", link_name = "__locatime50")]
1279     #[cfg_attr(any(target_env = "musl", target_env = "ohos"), allow(deprecated))]
1280     // FIXME: for `time_t`
1281     pub fn localtime(time_p: *const time_t) -> *mut tm;
1282     #[cfg_attr(target_os = "netbsd", link_name = "__difftime50")]
1283     #[cfg_attr(any(target_env = "musl", target_env = "ohos"), allow(deprecated))]
1284     // FIXME: for `time_t`
1285     pub fn difftime(time1: time_t, time0: time_t) -> ::c_double;
1286     #[cfg_attr(target_os = "netbsd", link_name = "__timegm50")]
1287     #[cfg_attr(any(target_env = "musl", target_env = "ohos"), allow(deprecated))]
1288     // FIXME: for `time_t`
1289     pub fn timegm(tm: *mut ::tm) -> time_t;
1290 
1291     #[cfg_attr(target_os = "netbsd", link_name = "__mknod50")]
1292     #[cfg_attr(
1293         all(target_os = "freebsd", any(freebsd11, freebsd10)),
1294         link_name = "mknod@FBSD_1.0"
1295     )]
1296     pub fn mknod(pathname: *const ::c_char, mode: ::mode_t, dev: ::dev_t) -> ::c_int;
1297     pub fn gethostname(name: *mut ::c_char, len: ::size_t) -> ::c_int;
1298     pub fn endservent();
1299     pub fn getservbyname(name: *const ::c_char, proto: *const ::c_char) -> *mut servent;
1300     pub fn getservbyport(port: ::c_int, proto: *const ::c_char) -> *mut servent;
1301     pub fn getservent() -> *mut servent;
1302     pub fn setservent(stayopen: ::c_int);
1303     pub fn getprotobyname(name: *const ::c_char) -> *mut protoent;
1304     pub fn getprotobynumber(proto: ::c_int) -> *mut protoent;
1305     pub fn chroot(name: *const ::c_char) -> ::c_int;
1306     #[cfg_attr(
1307         all(target_os = "macos", target_arch = "x86"),
1308         link_name = "usleep$UNIX2003"
1309     )]
1310     pub fn usleep(secs: ::c_uint) -> ::c_int;
1311     #[cfg_attr(
1312         all(target_os = "macos", target_arch = "x86"),
1313         link_name = "send$UNIX2003"
1314     )]
1315     #[cfg_attr(target_os = "espidf", link_name = "lwip_send")]
1316     pub fn send(socket: ::c_int, buf: *const ::c_void, len: ::size_t, flags: ::c_int) -> ::ssize_t;
1317     #[cfg_attr(
1318         all(target_os = "macos", target_arch = "x86"),
1319         link_name = "recv$UNIX2003"
1320     )]
1321     #[cfg_attr(target_os = "espidf", link_name = "lwip_recv")]
1322     pub fn recv(socket: ::c_int, buf: *mut ::c_void, len: ::size_t, flags: ::c_int) -> ::ssize_t;
1323     #[cfg_attr(
1324         all(target_os = "macos", target_arch = "x86"),
1325         link_name = "putenv$UNIX2003"
1326     )]
1327     #[cfg_attr(target_os = "netbsd", link_name = "__putenv50")]
1328     pub fn putenv(string: *mut c_char) -> ::c_int;
1329     #[cfg_attr(
1330         all(target_os = "macos", target_arch = "x86"),
1331         link_name = "poll$UNIX2003"
1332     )]
1333     pub fn poll(fds: *mut pollfd, nfds: nfds_t, timeout: ::c_int) -> ::c_int;
1334     #[cfg_attr(
1335         all(target_os = "macos", target_arch = "x86_64"),
1336         link_name = "select$1050"
1337     )]
1338     #[cfg_attr(
1339         all(target_os = "macos", target_arch = "x86"),
1340         link_name = "select$UNIX2003"
1341     )]
1342     #[cfg_attr(target_os = "netbsd", link_name = "__select50")]
1343     pub fn select(
1344         nfds: ::c_int,
1345         readfds: *mut fd_set,
1346         writefds: *mut fd_set,
1347         errorfds: *mut fd_set,
1348         timeout: *mut timeval,
1349     ) -> ::c_int;
1350     #[cfg_attr(target_os = "netbsd", link_name = "__setlocale50")]
1351     pub fn setlocale(category: ::c_int, locale: *const ::c_char) -> *mut ::c_char;
1352     pub fn localeconv() -> *mut lconv;
1353 
1354     #[cfg_attr(
1355         all(target_os = "macos", target_arch = "x86"),
1356         link_name = "sem_wait$UNIX2003"
1357     )]
1358     pub fn sem_wait(sem: *mut sem_t) -> ::c_int;
1359     pub fn sem_trywait(sem: *mut sem_t) -> ::c_int;
1360     pub fn sem_post(sem: *mut sem_t) -> ::c_int;
1361     pub fn statvfs(path: *const c_char, buf: *mut statvfs) -> ::c_int;
1362     pub fn fstatvfs(fd: ::c_int, buf: *mut statvfs) -> ::c_int;
1363 
1364     #[cfg_attr(target_os = "netbsd", link_name = "__sigemptyset14")]
1365     pub fn sigemptyset(set: *mut sigset_t) -> ::c_int;
1366     #[cfg_attr(target_os = "netbsd", link_name = "__sigaddset14")]
1367     pub fn sigaddset(set: *mut sigset_t, signum: ::c_int) -> ::c_int;
1368     #[cfg_attr(target_os = "netbsd", link_name = "__sigfillset14")]
1369     pub fn sigfillset(set: *mut sigset_t) -> ::c_int;
1370     #[cfg_attr(target_os = "netbsd", link_name = "__sigdelset14")]
1371     pub fn sigdelset(set: *mut sigset_t, signum: ::c_int) -> ::c_int;
1372     #[cfg_attr(target_os = "netbsd", link_name = "__sigismember14")]
1373     pub fn sigismember(set: *const sigset_t, signum: ::c_int) -> ::c_int;
1374 
1375     #[cfg_attr(target_os = "netbsd", link_name = "__sigprocmask14")]
1376     pub fn sigprocmask(how: ::c_int, set: *const sigset_t, oldset: *mut sigset_t) -> ::c_int;
1377     #[cfg_attr(target_os = "netbsd", link_name = "__sigpending14")]
1378     pub fn sigpending(set: *mut sigset_t) -> ::c_int;
1379 
1380     pub fn sysconf(name: ::c_int) -> ::c_long;
1381 
1382     pub fn mkfifo(path: *const c_char, mode: mode_t) -> ::c_int;
1383 
1384     pub fn fseeko(stream: *mut ::FILE, offset: ::off_t, whence: ::c_int) -> ::c_int;
1385     pub fn ftello(stream: *mut ::FILE) -> ::off_t;
1386     #[cfg_attr(
1387         all(target_os = "macos", target_arch = "x86"),
1388         link_name = "tcdrain$UNIX2003"
1389     )]
1390     pub fn tcdrain(fd: ::c_int) -> ::c_int;
1391     pub fn cfgetispeed(termios: *const ::termios) -> ::speed_t;
1392     pub fn cfgetospeed(termios: *const ::termios) -> ::speed_t;
1393     pub fn cfsetispeed(termios: *mut ::termios, speed: ::speed_t) -> ::c_int;
1394     pub fn cfsetospeed(termios: *mut ::termios, speed: ::speed_t) -> ::c_int;
1395     pub fn tcgetattr(fd: ::c_int, termios: *mut ::termios) -> ::c_int;
1396     pub fn tcsetattr(fd: ::c_int, optional_actions: ::c_int, termios: *const ::termios) -> ::c_int;
1397     pub fn tcflow(fd: ::c_int, action: ::c_int) -> ::c_int;
1398     pub fn tcflush(fd: ::c_int, action: ::c_int) -> ::c_int;
1399     pub fn tcgetsid(fd: ::c_int) -> ::pid_t;
1400     pub fn tcsendbreak(fd: ::c_int, duration: ::c_int) -> ::c_int;
1401     pub fn mkstemp(template: *mut ::c_char) -> ::c_int;
1402     pub fn mkdtemp(template: *mut ::c_char) -> *mut ::c_char;
1403 
1404     pub fn tmpnam(ptr: *mut ::c_char) -> *mut ::c_char;
1405 
1406     pub fn openlog(ident: *const ::c_char, logopt: ::c_int, facility: ::c_int);
1407     pub fn closelog();
1408     pub fn setlogmask(maskpri: ::c_int) -> ::c_int;
1409     #[cfg_attr(target_os = "macos", link_name = "syslog$DARWIN_EXTSN")]
1410     pub fn syslog(priority: ::c_int, message: *const ::c_char, ...);
1411     #[cfg_attr(
1412         all(target_os = "macos", target_arch = "x86"),
1413         link_name = "nice$UNIX2003"
1414     )]
1415     pub fn nice(incr: ::c_int) -> ::c_int;
1416 
1417     pub fn grantpt(fd: ::c_int) -> ::c_int;
1418     pub fn posix_openpt(flags: ::c_int) -> ::c_int;
1419     pub fn ptsname(fd: ::c_int) -> *mut ::c_char;
1420     pub fn unlockpt(fd: ::c_int) -> ::c_int;
1421 
1422     pub fn strcasestr(cs: *const c_char, ct: *const c_char) -> *mut c_char;
1423     pub fn getline(lineptr: *mut *mut c_char, n: *mut size_t, stream: *mut FILE) -> ssize_t;
1424 
1425     pub fn lockf(fd: ::c_int, cmd: ::c_int, len: ::off_t) -> ::c_int;
1426 
1427 }
1428 
1429 cfg_if! {
1430     if #[cfg(not(any(target_os = "emscripten",
1431                      target_os = "android",
1432                      target_os = "haiku",
1433                      target_os = "nto")))] {
1434         extern "C" {
1435             pub fn adjtime(delta: *const timeval, olddelta: *mut timeval) -> ::c_int;
1436         }
1437     }
1438 }
1439 
1440 cfg_if! {
1441     if #[cfg(not(any(target_os = "emscripten",
1442                      target_os = "android",
1443                      target_os = "nto")))] {
1444         extern "C" {
1445             pub fn stpncpy(dst: *mut c_char, src: *const c_char, n: size_t) -> *mut c_char;
1446         }
1447     }
1448 }
1449 
1450 cfg_if! {
1451     if #[cfg(not(target_os = "aix"))] {
1452         extern "C" {
1453             pub fn dladdr(addr: *const ::c_void, info: *mut Dl_info) -> ::c_int;
1454         }
1455     }
1456 }
1457 
1458 cfg_if! {
1459     if #[cfg(not(any(target_env = "uclibc", target_os = "nto")))] {
1460         extern "C" {
1461             pub fn open_wmemstream(
1462                 ptr: *mut *mut wchar_t,
1463                 sizeloc: *mut size_t,
1464             ) -> *mut FILE;
1465         }
1466     }
1467 }
1468 
1469 cfg_if! {
1470     if #[cfg(not(target_os = "redox"))] {
1471         extern {
1472             pub fn getsid(pid: pid_t) -> pid_t;
1473             #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
1474                        link_name = "pause$UNIX2003")]
1475             pub fn pause() -> ::c_int;
1476 
1477             pub fn mkdirat(dirfd: ::c_int, pathname: *const ::c_char,
1478                           mode: ::mode_t) -> ::c_int;
1479             pub fn openat(dirfd: ::c_int, pathname: *const ::c_char,
1480                           flags: ::c_int, ...) -> ::c_int;
1481 
1482             #[cfg_attr(all(target_os = "macos", target_arch = "x86_64"),
1483                        link_name = "fdopendir$INODE64")]
1484             #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
1485                        link_name = "fdopendir$INODE64$UNIX2003")]
1486             pub fn fdopendir(fd: ::c_int) -> *mut ::DIR;
1487 
1488             #[cfg_attr(all(target_os = "macos", not(target_arch = "aarch64")),
1489                        link_name = "readdir_r$INODE64")]
1490             #[cfg_attr(target_os = "netbsd", link_name = "__readdir_r30")]
1491             #[cfg_attr(
1492                 all(target_os = "freebsd", any(freebsd11, freebsd10)),
1493                 link_name = "readdir_r@FBSD_1.0"
1494             )]
1495             #[allow(non_autolinks)] // FIXME: `<>` breaks line length limit.
1496             /// The 64-bit libc on Solaris and illumos only has readdir_r. If a
1497             /// 32-bit Solaris or illumos target is ever created, it should use
1498             /// __posix_readdir_r. See libc(3LIB) on Solaris or illumos:
1499             /// https://illumos.org/man/3lib/libc
1500             /// https://docs.oracle.com/cd/E36784_01/html/E36873/libc-3lib.html
1501             /// https://www.unix.com/man-page/opensolaris/3LIB/libc/
1502             pub fn readdir_r(dirp: *mut ::DIR, entry: *mut ::dirent,
1503                              result: *mut *mut ::dirent) -> ::c_int;
1504         }
1505     }
1506 }
1507 
1508 cfg_if! {
1509     if #[cfg(target_os = "nto")] {
1510         extern {
1511             pub fn readlinkat(dirfd: ::c_int,
1512                 pathname: *const ::c_char,
1513                 buf: *mut ::c_char,
1514                 bufsiz: ::size_t) -> ::c_int;
1515             pub fn readlink(path: *const c_char, buf: *mut c_char, bufsz: ::size_t) -> ::c_int;
1516             pub fn pselect(
1517                 nfds: ::c_int,
1518                 readfds: *mut fd_set,
1519                 writefds: *mut fd_set,
1520                 errorfds: *mut fd_set,
1521                 timeout: *mut timespec,
1522                 sigmask: *const sigset_t,
1523             ) -> ::c_int;
1524             pub fn sigaction(
1525                 signum: ::c_int,
1526                 act: *const sigaction,
1527                 oldact: *mut sigaction
1528             ) -> ::c_int;
1529         }
1530     } else {
1531         extern {
1532             pub fn readlinkat(dirfd: ::c_int,
1533                 pathname: *const ::c_char,
1534                 buf: *mut ::c_char,
1535                 bufsiz: ::size_t) -> ::ssize_t;
1536             pub fn fmemopen(buf: *mut c_void, size: size_t, mode: *const c_char) -> *mut FILE;
1537             pub fn open_memstream(ptr: *mut *mut c_char, sizeloc: *mut size_t) -> *mut FILE;
1538             pub fn atexit(cb: extern "C" fn()) -> c_int;
1539             #[cfg_attr(target_os = "netbsd", link_name = "__sigaction14")]
1540             pub fn sigaction(
1541                 signum: ::c_int,
1542                 act: *const sigaction,
1543                 oldact: *mut sigaction
1544             ) -> ::c_int;
1545             pub fn readlink(path: *const c_char, buf: *mut c_char, bufsz: ::size_t) -> ::ssize_t;
1546             #[cfg_attr(
1547                 all(target_os = "macos", target_arch = "x86_64"),
1548                 link_name = "pselect$1050"
1549             )]
1550             #[cfg_attr(
1551                 all(target_os = "macos", target_arch = "x86"),
1552                 link_name = "pselect$UNIX2003"
1553             )]
1554             #[cfg_attr(target_os = "netbsd", link_name = "__pselect50")]
1555             pub fn pselect(
1556                 nfds: ::c_int,
1557                 readfds: *mut fd_set,
1558                 writefds: *mut fd_set,
1559                 errorfds: *mut fd_set,
1560                 timeout: *const timespec,
1561                 sigmask: *const sigset_t,
1562             ) -> ::c_int;
1563         }
1564     }
1565 }
1566 
1567 cfg_if! {
1568    if #[cfg(not(any(target_os = "solaris",
1569                     target_os = "illumos",
1570                     target_os = "nto",
1571                 )))] {
1572         extern {
1573             pub fn cfmakeraw(termios: *mut ::termios);
1574             pub fn cfsetspeed(termios: *mut ::termios,
1575                               speed: ::speed_t) -> ::c_int;
1576         }
1577    }
1578 }
1579 
1580 cfg_if! {
1581     if #[cfg(target_env = "newlib")] {
1582         mod newlib;
1583         pub use self::newlib::*;
1584     } else if #[cfg(any(target_os = "linux",
1585                         target_os = "l4re",
1586                         target_os = "android",
1587                         target_os = "emscripten"))] {
1588         mod linux_like;
1589         pub use self::linux_like::*;
1590     } else if #[cfg(any(target_os = "macos",
1591                         target_os = "ios",
1592                         target_os = "tvos",
1593                         target_os = "watchos",
1594                         target_os = "visionos",
1595                         target_os = "freebsd",
1596                         target_os = "dragonfly",
1597                         target_os = "openbsd",
1598                         target_os = "netbsd"))] {
1599         mod bsd;
1600         pub use self::bsd::*;
1601     } else if #[cfg(any(target_os = "solaris",
1602                         target_os = "illumos"))] {
1603         mod solarish;
1604         pub use self::solarish::*;
1605     } else if #[cfg(target_os = "haiku")] {
1606         mod haiku;
1607         pub use self::haiku::*;
1608     } else if #[cfg(target_os = "redox")] {
1609         mod redox;
1610         pub use self::redox::*;
1611     } else if #[cfg(target_os = "nto")] {
1612         mod nto;
1613         pub use self::nto::*;
1614     } else if #[cfg(target_os = "aix")] {
1615         mod aix;
1616         pub use self::aix::*;
1617     } else if #[cfg(target_os = "hurd")] {
1618         mod hurd;
1619         pub use self::hurd::*;
1620     } else {
1621         // Unknown target_os
1622     }
1623 }
1624 
1625 cfg_if! {
1626     if #[cfg(libc_core_cvoid)] {
1627         pub use ::ffi::c_void;
1628     } else {
1629         // Use repr(u8) as LLVM expects `void*` to be the same as `i8*` to help
1630         // enable more optimization opportunities around it recognizing things
1631         // like malloc/free.
1632         #[repr(u8)]
1633         #[allow(missing_copy_implementations)]
1634         #[allow(missing_debug_implementations)]
1635         pub enum c_void {
1636             // Two dummy variants so the #[repr] attribute can be used.
1637             #[doc(hidden)]
1638             __variant1,
1639             #[doc(hidden)]
1640             __variant2,
1641         }
1642     }
1643 }
1644 
1645 cfg_if! {
1646     if #[cfg(libc_align)] {
1647         mod align;
1648         pub use self::align::*;
1649     } else {
1650         mod no_align;
1651         pub use self::no_align::*;
1652     }
1653 }
1654