1 | /* Copyright (C) 1991-2019 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ |
17 | |
18 | /* |
19 | * POSIX Standard: 2.10 Symbolic Constants <unistd.h> |
20 | */ |
21 | |
22 | #ifndef _UNISTD_H |
23 | #define _UNISTD_H 1 |
24 | |
25 | #include <features.h> |
26 | |
27 | __BEGIN_DECLS |
28 | |
29 | /* These may be used to determine what facilities are present at compile time. |
30 | Their values can be obtained at run time from `sysconf'. */ |
31 | |
32 | #ifdef __USE_XOPEN2K8 |
33 | /* POSIX Standard approved as ISO/IEC 9945-1 as of September 2008. */ |
34 | # define _POSIX_VERSION 200809L |
35 | #elif defined __USE_XOPEN2K |
36 | /* POSIX Standard approved as ISO/IEC 9945-1 as of December 2001. */ |
37 | # define _POSIX_VERSION 200112L |
38 | #elif defined __USE_POSIX199506 |
39 | /* POSIX Standard approved as ISO/IEC 9945-1 as of June 1995. */ |
40 | # define _POSIX_VERSION 199506L |
41 | #elif defined __USE_POSIX199309 |
42 | /* POSIX Standard approved as ISO/IEC 9945-1 as of September 1993. */ |
43 | # define _POSIX_VERSION 199309L |
44 | #else |
45 | /* POSIX Standard approved as ISO/IEC 9945-1 as of September 1990. */ |
46 | # define _POSIX_VERSION 199009L |
47 | #endif |
48 | |
49 | /* These are not #ifdef __USE_POSIX2 because they are |
50 | in the theoretically application-owned namespace. */ |
51 | |
52 | #ifdef __USE_XOPEN2K8 |
53 | # define __POSIX2_THIS_VERSION 200809L |
54 | /* The utilities on GNU systems also correspond to this version. */ |
55 | #elif defined __USE_XOPEN2K |
56 | /* The utilities on GNU systems also correspond to this version. */ |
57 | # define __POSIX2_THIS_VERSION 200112L |
58 | #elif defined __USE_POSIX199506 |
59 | /* The utilities on GNU systems also correspond to this version. */ |
60 | # define __POSIX2_THIS_VERSION 199506L |
61 | #else |
62 | /* The utilities on GNU systems also correspond to this version. */ |
63 | # define __POSIX2_THIS_VERSION 199209L |
64 | #endif |
65 | |
66 | /* The utilities on GNU systems also correspond to this version. */ |
67 | #define _POSIX2_VERSION __POSIX2_THIS_VERSION |
68 | |
69 | /* This symbol was required until the 2001 edition of POSIX. */ |
70 | #define _POSIX2_C_VERSION __POSIX2_THIS_VERSION |
71 | |
72 | /* If defined, the implementation supports the |
73 | C Language Bindings Option. */ |
74 | #define _POSIX2_C_BIND __POSIX2_THIS_VERSION |
75 | |
76 | /* If defined, the implementation supports the |
77 | C Language Development Utilities Option. */ |
78 | #define _POSIX2_C_DEV __POSIX2_THIS_VERSION |
79 | |
80 | /* If defined, the implementation supports the |
81 | Software Development Utilities Option. */ |
82 | #define _POSIX2_SW_DEV __POSIX2_THIS_VERSION |
83 | |
84 | /* If defined, the implementation supports the |
85 | creation of locales with the localedef utility. */ |
86 | #define _POSIX2_LOCALEDEF __POSIX2_THIS_VERSION |
87 | |
88 | /* X/Open version number to which the library conforms. It is selectable. */ |
89 | #ifdef __USE_XOPEN2K8 |
90 | # define _XOPEN_VERSION 700 |
91 | #elif defined __USE_XOPEN2K |
92 | # define _XOPEN_VERSION 600 |
93 | #elif defined __USE_UNIX98 |
94 | # define _XOPEN_VERSION 500 |
95 | #else |
96 | # define _XOPEN_VERSION 4 |
97 | #endif |
98 | |
99 | /* Commands and utilities from XPG4 are available. */ |
100 | #define _XOPEN_XCU_VERSION 4 |
101 | |
102 | /* We are compatible with the old published standards as well. */ |
103 | #define _XOPEN_XPG2 1 |
104 | #define _XOPEN_XPG3 1 |
105 | #define _XOPEN_XPG4 1 |
106 | |
107 | /* The X/Open Unix extensions are available. */ |
108 | #define _XOPEN_UNIX 1 |
109 | |
110 | /* The enhanced internationalization capabilities according to XPG4.2 |
111 | are present. */ |
112 | #define _XOPEN_ENH_I18N 1 |
113 | |
114 | /* The legacy interfaces are also available. */ |
115 | #define _XOPEN_LEGACY 1 |
116 | |
117 | |
118 | /* Get values of POSIX options: |
119 | |
120 | If these symbols are defined, the corresponding features are |
121 | always available. If not, they may be available sometimes. |
122 | The current values can be obtained with `sysconf'. |
123 | |
124 | _POSIX_JOB_CONTROL Job control is supported. |
125 | _POSIX_SAVED_IDS Processes have a saved set-user-ID |
126 | and a saved set-group-ID. |
127 | _POSIX_REALTIME_SIGNALS Real-time, queued signals are supported. |
128 | _POSIX_PRIORITY_SCHEDULING Priority scheduling is supported. |
129 | _POSIX_TIMERS POSIX.4 clocks and timers are supported. |
130 | _POSIX_ASYNCHRONOUS_IO Asynchronous I/O is supported. |
131 | _POSIX_PRIORITIZED_IO Prioritized asynchronous I/O is supported. |
132 | _POSIX_SYNCHRONIZED_IO Synchronizing file data is supported. |
133 | _POSIX_FSYNC The fsync function is present. |
134 | _POSIX_MAPPED_FILES Mapping of files to memory is supported. |
135 | _POSIX_MEMLOCK Locking of all memory is supported. |
136 | _POSIX_MEMLOCK_RANGE Locking of ranges of memory is supported. |
137 | _POSIX_MEMORY_PROTECTION Setting of memory protections is supported. |
138 | _POSIX_MESSAGE_PASSING POSIX.4 message queues are supported. |
139 | _POSIX_SEMAPHORES POSIX.4 counting semaphores are supported. |
140 | _POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported. |
141 | _POSIX_THREADS POSIX.1c pthreads are supported. |
142 | _POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported. |
143 | _POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported. |
144 | _POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported. |
145 | _POSIX_THREAD_PRIORITY_SCHEDULING |
146 | POSIX.1c thread execution scheduling supported. |
147 | _POSIX_THREAD_PRIO_INHERIT Thread priority inheritance option supported. |
148 | _POSIX_THREAD_PRIO_PROTECT Thread priority protection option supported. |
149 | _POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported. |
150 | _POSIX_PII Protocol-independent interfaces are supported. |
151 | _POSIX_PII_XTI XTI protocol-indep. interfaces are supported. |
152 | _POSIX_PII_SOCKET Socket protocol-indep. interfaces are supported. |
153 | _POSIX_PII_INTERNET Internet family of protocols supported. |
154 | _POSIX_PII_INTERNET_STREAM Connection-mode Internet protocol supported. |
155 | _POSIX_PII_INTERNET_DGRAM Connectionless Internet protocol supported. |
156 | _POSIX_PII_OSI ISO/OSI family of protocols supported. |
157 | _POSIX_PII_OSI_COTS Connection-mode ISO/OSI service supported. |
158 | _POSIX_PII_OSI_CLTS Connectionless ISO/OSI service supported. |
159 | _POSIX_POLL Implementation supports `poll' function. |
160 | _POSIX_SELECT Implementation supports `select' and `pselect'. |
161 | |
162 | _XOPEN_REALTIME X/Open realtime support is available. |
163 | _XOPEN_REALTIME_THREADS X/Open realtime thread support is available. |
164 | _XOPEN_SHM Shared memory interface according to XPG4.2. |
165 | |
166 | _XBS5_ILP32_OFF32 Implementation provides environment with 32-bit |
167 | int, long, pointer, and off_t types. |
168 | _XBS5_ILP32_OFFBIG Implementation provides environment with 32-bit |
169 | int, long, and pointer and off_t with at least |
170 | 64 bits. |
171 | _XBS5_LP64_OFF64 Implementation provides environment with 32-bit |
172 | int, and 64-bit long, pointer, and off_t types. |
173 | _XBS5_LPBIG_OFFBIG Implementation provides environment with at |
174 | least 32 bits int and long, pointer, and off_t |
175 | with at least 64 bits. |
176 | |
177 | If any of these symbols is defined as -1, the corresponding option is not |
178 | true for any file. If any is defined as other than -1, the corresponding |
179 | option is true for all files. If a symbol is not defined at all, the value |
180 | for a specific file can be obtained from `pathconf' and `fpathconf'. |
181 | |
182 | _POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change |
183 | the owner of a file. `chown' can only be used |
184 | to change the group ID of a file to a group of |
185 | which the calling process is a member. |
186 | _POSIX_NO_TRUNC Pathname components longer than |
187 | NAME_MAX generate an error. |
188 | _POSIX_VDISABLE If defined, if the value of an element of the |
189 | `c_cc' member of `struct termios' is |
190 | _POSIX_VDISABLE, no character will have the |
191 | effect associated with that element. |
192 | _POSIX_SYNC_IO Synchronous I/O may be performed. |
193 | _POSIX_ASYNC_IO Asynchronous I/O may be performed. |
194 | _POSIX_PRIO_IO Prioritized Asynchronous I/O may be performed. |
195 | |
196 | Support for the Large File Support interface is not generally available. |
197 | If it is available the following constants are defined to one. |
198 | _LFS64_LARGEFILE Low-level I/O supports large files. |
199 | _LFS64_STDIO Standard I/O supports large files. |
200 | */ |
201 | |
202 | #include <bits/posix_opt.h> |
203 | |
204 | /* Get the environment definitions from Unix98. */ |
205 | #if defined __USE_UNIX98 || defined __USE_XOPEN2K |
206 | # include <bits/environments.h> |
207 | #endif |
208 | |
209 | /* Standard file descriptors. */ |
210 | #define STDIN_FILENO 0 /* Standard input. */ |
211 | #define STDOUT_FILENO 1 /* Standard output. */ |
212 | #define STDERR_FILENO 2 /* Standard error output. */ |
213 | |
214 | |
215 | /* All functions that are not declared anywhere else. */ |
216 | |
217 | #include <bits/types.h> |
218 | |
219 | #ifndef __ssize_t_defined |
220 | typedef __ssize_t ssize_t; |
221 | # define __ssize_t_defined |
222 | #endif |
223 | |
224 | #define __need_size_t |
225 | #define __need_NULL |
226 | #include <stddef.h> |
227 | |
228 | #if defined __USE_XOPEN || defined __USE_XOPEN2K |
229 | /* The Single Unix specification says that some more types are |
230 | available here. */ |
231 | # ifndef __gid_t_defined |
232 | typedef __gid_t gid_t; |
233 | # define __gid_t_defined |
234 | # endif |
235 | |
236 | # ifndef __uid_t_defined |
237 | typedef __uid_t uid_t; |
238 | # define __uid_t_defined |
239 | # endif |
240 | |
241 | # ifndef __off_t_defined |
242 | # ifndef __USE_FILE_OFFSET64 |
243 | typedef __off_t off_t; |
244 | # else |
245 | typedef __off64_t off_t; |
246 | # endif |
247 | # define __off_t_defined |
248 | # endif |
249 | # if defined __USE_LARGEFILE64 && !defined __off64_t_defined |
250 | typedef __off64_t off64_t; |
251 | # define __off64_t_defined |
252 | # endif |
253 | |
254 | # ifndef __useconds_t_defined |
255 | typedef __useconds_t useconds_t; |
256 | # define __useconds_t_defined |
257 | # endif |
258 | |
259 | # ifndef __pid_t_defined |
260 | typedef __pid_t pid_t; |
261 | # define __pid_t_defined |
262 | # endif |
263 | #endif /* X/Open */ |
264 | |
265 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K |
266 | # ifndef __intptr_t_defined |
267 | typedef __intptr_t intptr_t; |
268 | # define __intptr_t_defined |
269 | # endif |
270 | #endif |
271 | |
272 | #if defined __USE_MISC || defined __USE_XOPEN |
273 | # ifndef __socklen_t_defined |
274 | typedef __socklen_t socklen_t; |
275 | # define __socklen_t_defined |
276 | # endif |
277 | #endif |
278 | |
279 | /* Values for the second argument to access. |
280 | These may be OR'd together. */ |
281 | #define R_OK 4 /* Test for read permission. */ |
282 | #define W_OK 2 /* Test for write permission. */ |
283 | #define X_OK 1 /* Test for execute permission. */ |
284 | #define F_OK 0 /* Test for existence. */ |
285 | |
286 | /* Test for access to NAME using the real UID and real GID. */ |
287 | extern int access (const char *__name, int __type) __THROW __nonnull ((1)); |
288 | |
289 | #ifdef __USE_GNU |
290 | /* Test for access to NAME using the effective UID and GID |
291 | (as normal file operations use). */ |
292 | extern int euidaccess (const char *__name, int __type) |
293 | __THROW __nonnull ((1)); |
294 | |
295 | /* An alias for `euidaccess', used by some other systems. */ |
296 | extern int eaccess (const char *__name, int __type) |
297 | __THROW __nonnull ((1)); |
298 | #endif |
299 | |
300 | #ifdef __USE_ATFILE |
301 | /* Test for access to FILE relative to the directory FD is open on. |
302 | If AT_EACCESS is set in FLAG, then use effective IDs like `eaccess', |
303 | otherwise use real IDs like `access'. */ |
304 | extern int faccessat (int __fd, const char *__file, int __type, int __flag) |
305 | __THROW __nonnull ((2)) __wur; |
306 | #endif /* Use GNU. */ |
307 | |
308 | |
309 | /* Values for the WHENCE argument to lseek. */ |
310 | #ifndef _STDIO_H /* <stdio.h> has the same definitions. */ |
311 | # define SEEK_SET 0 /* Seek from beginning of file. */ |
312 | # define SEEK_CUR 1 /* Seek from current position. */ |
313 | # define SEEK_END 2 /* Seek from end of file. */ |
314 | # ifdef __USE_GNU |
315 | # define SEEK_DATA 3 /* Seek to next data. */ |
316 | # define SEEK_HOLE 4 /* Seek to next hole. */ |
317 | # endif |
318 | #endif |
319 | |
320 | #if defined __USE_MISC && !defined L_SET |
321 | /* Old BSD names for the same constants; just for compatibility. */ |
322 | # define L_SET SEEK_SET |
323 | # define L_INCR SEEK_CUR |
324 | # define L_XTND SEEK_END |
325 | #endif |
326 | |
327 | |
328 | /* Move FD's file position to OFFSET bytes from the |
329 | beginning of the file (if WHENCE is SEEK_SET), |
330 | the current position (if WHENCE is SEEK_CUR), |
331 | or the end of the file (if WHENCE is SEEK_END). |
332 | Return the new file position. */ |
333 | #ifndef __USE_FILE_OFFSET64 |
334 | extern __off_t lseek (int __fd, __off_t __offset, int __whence) __THROW; |
335 | #else |
336 | # ifdef __REDIRECT_NTH |
337 | extern __off64_t __REDIRECT_NTH (lseek, |
338 | (int __fd, __off64_t __offset, int __whence), |
339 | lseek64); |
340 | # else |
341 | # define lseek lseek64 |
342 | # endif |
343 | #endif |
344 | #ifdef __USE_LARGEFILE64 |
345 | extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence) |
346 | __THROW; |
347 | #endif |
348 | |
349 | /* Close the file descriptor FD. |
350 | |
351 | This function is a cancellation point and therefore not marked with |
352 | __THROW. */ |
353 | extern int close (int __fd); |
354 | |
355 | /* Read NBYTES into BUF from FD. Return the |
356 | number read, -1 for errors or 0 for EOF. |
357 | |
358 | This function is a cancellation point and therefore not marked with |
359 | __THROW. */ |
360 | extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur; |
361 | |
362 | /* Write N bytes of BUF to FD. Return the number written, or -1. |
363 | |
364 | This function is a cancellation point and therefore not marked with |
365 | __THROW. */ |
366 | extern ssize_t write (int __fd, const void *__buf, size_t __n) __wur; |
367 | |
368 | #if defined __USE_UNIX98 || defined __USE_XOPEN2K8 |
369 | # ifndef __USE_FILE_OFFSET64 |
370 | /* Read NBYTES into BUF from FD at the given position OFFSET without |
371 | changing the file pointer. Return the number read, -1 for errors |
372 | or 0 for EOF. |
373 | |
374 | This function is a cancellation point and therefore not marked with |
375 | __THROW. */ |
376 | extern ssize_t pread (int __fd, void *__buf, size_t __nbytes, |
377 | __off_t __offset) __wur; |
378 | |
379 | /* Write N bytes of BUF to FD at the given position OFFSET without |
380 | changing the file pointer. Return the number written, or -1. |
381 | |
382 | This function is a cancellation point and therefore not marked with |
383 | __THROW. */ |
384 | extern ssize_t pwrite (int __fd, const void *__buf, size_t __n, |
385 | __off_t __offset) __wur; |
386 | # else |
387 | # ifdef __REDIRECT |
388 | extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes, |
389 | __off64_t __offset), |
390 | pread64) __wur; |
391 | extern ssize_t __REDIRECT (pwrite, (int __fd, const void *__buf, |
392 | size_t __nbytes, __off64_t __offset), |
393 | pwrite64) __wur; |
394 | # else |
395 | # define pread pread64 |
396 | # define pwrite pwrite64 |
397 | # endif |
398 | # endif |
399 | |
400 | # ifdef __USE_LARGEFILE64 |
401 | /* Read NBYTES into BUF from FD at the given position OFFSET without |
402 | changing the file pointer. Return the number read, -1 for errors |
403 | or 0 for EOF. */ |
404 | extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes, |
405 | __off64_t __offset) __wur; |
406 | /* Write N bytes of BUF to FD at the given position OFFSET without |
407 | changing the file pointer. Return the number written, or -1. */ |
408 | extern ssize_t pwrite64 (int __fd, const void *__buf, size_t __n, |
409 | __off64_t __offset) __wur; |
410 | # endif |
411 | #endif |
412 | |
413 | /* Create a one-way communication channel (pipe). |
414 | If successful, two file descriptors are stored in PIPEDES; |
415 | bytes written on PIPEDES[1] can be read from PIPEDES[0]. |
416 | Returns 0 if successful, -1 if not. */ |
417 | extern int pipe (int __pipedes[2]) __THROW __wur; |
418 | |
419 | #ifdef __USE_GNU |
420 | /* Same as pipe but apply flags passed in FLAGS to the new file |
421 | descriptors. */ |
422 | extern int pipe2 (int __pipedes[2], int __flags) __THROW __wur; |
423 | #endif |
424 | |
425 | /* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM. |
426 | If SECONDS is zero, any currently scheduled alarm will be cancelled. |
427 | The function returns the number of seconds remaining until the last |
428 | alarm scheduled would have signaled, or zero if there wasn't one. |
429 | There is no return value to indicate an error, but you can set `errno' |
430 | to 0 and check its value after calling `alarm', and this might tell you. |
431 | The signal may come late due to processor scheduling. */ |
432 | extern unsigned int alarm (unsigned int __seconds) __THROW; |
433 | |
434 | /* Make the process sleep for SECONDS seconds, or until a signal arrives |
435 | and is not ignored. The function returns the number of seconds less |
436 | than SECONDS which it actually slept (thus zero if it slept the full time). |
437 | If a signal handler does a `longjmp' or modifies the handling of the |
438 | SIGALRM signal while inside `sleep' call, the handling of the SIGALRM |
439 | signal afterwards is undefined. There is no return value to indicate |
440 | error, but if `sleep' returns SECONDS, it probably didn't work. |
441 | |
442 | This function is a cancellation point and therefore not marked with |
443 | __THROW. */ |
444 | extern unsigned int sleep (unsigned int __seconds); |
445 | |
446 | #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \ |
447 | || defined __USE_MISC |
448 | /* Set an alarm to go off (generating a SIGALRM signal) in VALUE |
449 | microseconds. If INTERVAL is nonzero, when the alarm goes off, the |
450 | timer is reset to go off every INTERVAL microseconds thereafter. |
451 | Returns the number of microseconds remaining before the alarm. */ |
452 | extern __useconds_t ualarm (__useconds_t __value, __useconds_t __interval) |
453 | __THROW; |
454 | |
455 | /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked |
456 | or ignored. |
457 | |
458 | This function is a cancellation point and therefore not marked with |
459 | __THROW. */ |
460 | extern int usleep (__useconds_t __useconds); |
461 | #endif |
462 | |
463 | |
464 | /* Suspend the process until a signal arrives. |
465 | This always returns -1 and sets `errno' to EINTR. |
466 | |
467 | This function is a cancellation point and therefore not marked with |
468 | __THROW. */ |
469 | extern int pause (void); |
470 | |
471 | |
472 | /* Change the owner and group of FILE. */ |
473 | extern int chown (const char *__file, __uid_t __owner, __gid_t __group) |
474 | __THROW __nonnull ((1)) __wur; |
475 | |
476 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 |
477 | /* Change the owner and group of the file that FD is open on. */ |
478 | extern int fchown (int __fd, __uid_t __owner, __gid_t __group) __THROW __wur; |
479 | |
480 | |
481 | /* Change owner and group of FILE, if it is a symbolic |
482 | link the ownership of the symbolic link is changed. */ |
483 | extern int lchown (const char *__file, __uid_t __owner, __gid_t __group) |
484 | __THROW __nonnull ((1)) __wur; |
485 | |
486 | #endif /* Use X/Open Unix. */ |
487 | |
488 | #ifdef __USE_ATFILE |
489 | /* Change the owner and group of FILE relative to the directory FD is open |
490 | on. */ |
491 | extern int fchownat (int __fd, const char *__file, __uid_t __owner, |
492 | __gid_t __group, int __flag) |
493 | __THROW __nonnull ((2)) __wur; |
494 | #endif /* Use GNU. */ |
495 | |
496 | /* Change the process's working directory to PATH. */ |
497 | extern int chdir (const char *__path) __THROW __nonnull ((1)) __wur; |
498 | |
499 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 |
500 | /* Change the process's working directory to the one FD is open on. */ |
501 | extern int fchdir (int __fd) __THROW __wur; |
502 | #endif |
503 | |
504 | /* Get the pathname of the current working directory, |
505 | and put it in SIZE bytes of BUF. Returns NULL if the |
506 | directory couldn't be determined or SIZE was too small. |
507 | If successful, returns BUF. In GNU, if BUF is NULL, |
508 | an array is allocated with `malloc'; the array is SIZE |
509 | bytes long, unless SIZE == 0, in which case it is as |
510 | big as necessary. */ |
511 | extern char *getcwd (char *__buf, size_t __size) __THROW __wur; |
512 | |
513 | #ifdef __USE_GNU |
514 | /* Return a malloc'd string containing the current directory name. |
515 | If the environment variable `PWD' is set, and its value is correct, |
516 | that value is used. */ |
517 | extern char *get_current_dir_name (void) __THROW; |
518 | #endif |
519 | |
520 | #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \ |
521 | || defined __USE_MISC |
522 | /* Put the absolute pathname of the current working directory in BUF. |
523 | If successful, return BUF. If not, put an error message in |
524 | BUF and return NULL. BUF should be at least PATH_MAX bytes long. */ |
525 | extern char *getwd (char *__buf) |
526 | __THROW __nonnull ((1)) __attribute_deprecated__ __wur; |
527 | #endif |
528 | |
529 | |
530 | /* Duplicate FD, returning a new file descriptor on the same file. */ |
531 | extern int dup (int __fd) __THROW __wur; |
532 | |
533 | /* Duplicate FD to FD2, closing FD2 and making it open on the same file. */ |
534 | extern int dup2 (int __fd, int __fd2) __THROW; |
535 | |
536 | #ifdef __USE_GNU |
537 | /* Duplicate FD to FD2, closing FD2 and making it open on the same |
538 | file while setting flags according to FLAGS. */ |
539 | extern int dup3 (int __fd, int __fd2, int __flags) __THROW; |
540 | #endif |
541 | |
542 | /* NULL-terminated array of "NAME=VALUE" environment variables. */ |
543 | extern char **__environ; |
544 | #ifdef __USE_GNU |
545 | extern char **environ; |
546 | #endif |
547 | |
548 | |
549 | /* Replace the current process, executing PATH with arguments ARGV and |
550 | environment ENVP. ARGV and ENVP are terminated by NULL pointers. */ |
551 | extern int execve (const char *__path, char *const __argv[], |
552 | char *const __envp[]) __THROW __nonnull ((1, 2)); |
553 | |
554 | #ifdef __USE_XOPEN2K8 |
555 | /* Execute the file FD refers to, overlaying the running program image. |
556 | ARGV and ENVP are passed to the new program, as for `execve'. */ |
557 | extern int fexecve (int __fd, char *const __argv[], char *const __envp[]) |
558 | __THROW __nonnull ((2)); |
559 | #endif |
560 | |
561 | |
562 | /* Execute PATH with arguments ARGV and environment from `environ'. */ |
563 | extern int execv (const char *__path, char *const __argv[]) |
564 | __THROW __nonnull ((1, 2)); |
565 | |
566 | /* Execute PATH with all arguments after PATH until a NULL pointer, |
567 | and the argument after that for environment. */ |
568 | extern int execle (const char *__path, const char *__arg, ...) |
569 | __THROW __nonnull ((1, 2)); |
570 | |
571 | /* Execute PATH with all arguments after PATH until |
572 | a NULL pointer and environment from `environ'. */ |
573 | extern int execl (const char *__path, const char *__arg, ...) |
574 | __THROW __nonnull ((1, 2)); |
575 | |
576 | /* Execute FILE, searching in the `PATH' environment variable if it contains |
577 | no slashes, with arguments ARGV and environment from `environ'. */ |
578 | extern int execvp (const char *__file, char *const __argv[]) |
579 | __THROW __nonnull ((1, 2)); |
580 | |
581 | /* Execute FILE, searching in the `PATH' environment variable if |
582 | it contains no slashes, with all arguments after FILE until a |
583 | NULL pointer and environment from `environ'. */ |
584 | extern int execlp (const char *__file, const char *__arg, ...) |
585 | __THROW __nonnull ((1, 2)); |
586 | |
587 | #ifdef __USE_GNU |
588 | /* Execute FILE, searching in the `PATH' environment variable if it contains |
589 | no slashes, with arguments ARGV and environment from `environ'. */ |
590 | extern int execvpe (const char *__file, char *const __argv[], |
591 | char *const __envp[]) |
592 | __THROW __nonnull ((1, 2)); |
593 | #endif |
594 | |
595 | |
596 | #if defined __USE_MISC || defined __USE_XOPEN |
597 | /* Add INC to priority of the current process. */ |
598 | extern int nice (int __inc) __THROW __wur; |
599 | #endif |
600 | |
601 | |
602 | /* Terminate program execution with the low-order 8 bits of STATUS. */ |
603 | extern void _exit (int __status) __attribute__ ((__noreturn__)); |
604 | |
605 | |
606 | /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf'; |
607 | the `_SC_*' symbols for the NAME argument to `sysconf'; |
608 | and the `_CS_*' symbols for the NAME argument to `confstr'. */ |
609 | #include <bits/confname.h> |
610 | |
611 | /* Get file-specific configuration information about PATH. */ |
612 | extern long int pathconf (const char *__path, int __name) |
613 | __THROW __nonnull ((1)); |
614 | |
615 | /* Get file-specific configuration about descriptor FD. */ |
616 | extern long int fpathconf (int __fd, int __name) __THROW; |
617 | |
618 | /* Get the value of the system variable NAME. */ |
619 | extern long int sysconf (int __name) __THROW; |
620 | |
621 | #ifdef __USE_POSIX2 |
622 | /* Get the value of the string-valued system variable NAME. */ |
623 | extern size_t confstr (int __name, char *__buf, size_t __len) __THROW; |
624 | #endif |
625 | |
626 | |
627 | /* Get the process ID of the calling process. */ |
628 | extern __pid_t getpid (void) __THROW; |
629 | |
630 | /* Get the process ID of the calling process's parent. */ |
631 | extern __pid_t getppid (void) __THROW; |
632 | |
633 | /* Get the process group ID of the calling process. */ |
634 | extern __pid_t getpgrp (void) __THROW; |
635 | |
636 | /* Get the process group ID of process PID. */ |
637 | extern __pid_t __getpgid (__pid_t __pid) __THROW; |
638 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 |
639 | extern __pid_t getpgid (__pid_t __pid) __THROW; |
640 | #endif |
641 | |
642 | |
643 | /* Set the process group ID of the process matching PID to PGID. |
644 | If PID is zero, the current process's process group ID is set. |
645 | If PGID is zero, the process ID of the process is used. */ |
646 | extern int setpgid (__pid_t __pid, __pid_t __pgid) __THROW; |
647 | |
648 | #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED |
649 | /* Both System V and BSD have `setpgrp' functions, but with different |
650 | calling conventions. The BSD function is the same as POSIX.1 `setpgid' |
651 | (above). The System V function takes no arguments and puts the calling |
652 | process in its on group like `setpgid (0, 0)'. |
653 | |
654 | New programs should always use `setpgid' instead. |
655 | |
656 | GNU provides the POSIX.1 function. */ |
657 | |
658 | /* Set the process group ID of the calling process to its own PID. |
659 | This is exactly the same as `setpgid (0, 0)'. */ |
660 | extern int setpgrp (void) __THROW; |
661 | |
662 | #endif /* Use misc or X/Open. */ |
663 | |
664 | /* Create a new session with the calling process as its leader. |
665 | The process group IDs of the session and the calling process |
666 | are set to the process ID of the calling process, which is returned. */ |
667 | extern __pid_t setsid (void) __THROW; |
668 | |
669 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 |
670 | /* Return the session ID of the given process. */ |
671 | extern __pid_t getsid (__pid_t __pid) __THROW; |
672 | #endif |
673 | |
674 | /* Get the real user ID of the calling process. */ |
675 | extern __uid_t getuid (void) __THROW; |
676 | |
677 | /* Get the effective user ID of the calling process. */ |
678 | extern __uid_t geteuid (void) __THROW; |
679 | |
680 | /* Get the real group ID of the calling process. */ |
681 | extern __gid_t getgid (void) __THROW; |
682 | |
683 | /* Get the effective group ID of the calling process. */ |
684 | extern __gid_t getegid (void) __THROW; |
685 | |
686 | /* If SIZE is zero, return the number of supplementary groups |
687 | the calling process is in. Otherwise, fill in the group IDs |
688 | of its supplementary groups in LIST and return the number written. */ |
689 | extern int getgroups (int __size, __gid_t __list[]) __THROW __wur; |
690 | |
691 | #ifdef __USE_GNU |
692 | /* Return nonzero iff the calling process is in group GID. */ |
693 | extern int group_member (__gid_t __gid) __THROW; |
694 | #endif |
695 | |
696 | /* Set the user ID of the calling process to UID. |
697 | If the calling process is the super-user, set the real |
698 | and effective user IDs, and the saved set-user-ID to UID; |
699 | if not, the effective user ID is set to UID. */ |
700 | extern int setuid (__uid_t __uid) __THROW __wur; |
701 | |
702 | #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED |
703 | /* Set the real user ID of the calling process to RUID, |
704 | and the effective user ID of the calling process to EUID. */ |
705 | extern int setreuid (__uid_t __ruid, __uid_t __euid) __THROW __wur; |
706 | #endif |
707 | |
708 | #ifdef __USE_XOPEN2K |
709 | /* Set the effective user ID of the calling process to UID. */ |
710 | extern int seteuid (__uid_t __uid) __THROW __wur; |
711 | #endif /* Use POSIX.1-2001. */ |
712 | |
713 | /* Set the group ID of the calling process to GID. |
714 | If the calling process is the super-user, set the real |
715 | and effective group IDs, and the saved set-group-ID to GID; |
716 | if not, the effective group ID is set to GID. */ |
717 | extern int setgid (__gid_t __gid) __THROW __wur; |
718 | |
719 | #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED |
720 | /* Set the real group ID of the calling process to RGID, |
721 | and the effective group ID of the calling process to EGID. */ |
722 | extern int setregid (__gid_t __rgid, __gid_t __egid) __THROW __wur; |
723 | #endif |
724 | |
725 | #ifdef __USE_XOPEN2K |
726 | /* Set the effective group ID of the calling process to GID. */ |
727 | extern int setegid (__gid_t __gid) __THROW __wur; |
728 | #endif /* Use POSIX.1-2001. */ |
729 | |
730 | #ifdef __USE_GNU |
731 | /* Fetch the real user ID, effective user ID, and saved-set user ID, |
732 | of the calling process. */ |
733 | extern int getresuid (__uid_t *__ruid, __uid_t *__euid, __uid_t *__suid) |
734 | __THROW; |
735 | |
736 | /* Fetch the real group ID, effective group ID, and saved-set group ID, |
737 | of the calling process. */ |
738 | extern int getresgid (__gid_t *__rgid, __gid_t *__egid, __gid_t *__sgid) |
739 | __THROW; |
740 | |
741 | /* Set the real user ID, effective user ID, and saved-set user ID, |
742 | of the calling process to RUID, EUID, and SUID, respectively. */ |
743 | extern int setresuid (__uid_t __ruid, __uid_t __euid, __uid_t __suid) |
744 | __THROW __wur; |
745 | |
746 | /* Set the real group ID, effective group ID, and saved-set group ID, |
747 | of the calling process to RGID, EGID, and SGID, respectively. */ |
748 | extern int setresgid (__gid_t __rgid, __gid_t __egid, __gid_t __sgid) |
749 | __THROW __wur; |
750 | #endif |
751 | |
752 | |
753 | /* Clone the calling process, creating an exact copy. |
754 | Return -1 for errors, 0 to the new process, |
755 | and the process ID of the new process to the old process. */ |
756 | extern __pid_t fork (void) __THROWNL; |
757 | |
758 | #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \ |
759 | || defined __USE_MISC |
760 | /* Clone the calling process, but without copying the whole address space. |
761 | The calling process is suspended until the new process exits or is |
762 | replaced by a call to `execve'. Return -1 for errors, 0 to the new process, |
763 | and the process ID of the new process to the old process. */ |
764 | extern __pid_t vfork (void) __THROW; |
765 | #endif /* Use misc or XPG < 7. */ |
766 | |
767 | |
768 | /* Return the pathname of the terminal FD is open on, or NULL on errors. |
769 | The returned storage is good only until the next call to this function. */ |
770 | extern char *ttyname (int __fd) __THROW; |
771 | |
772 | /* Store at most BUFLEN characters of the pathname of the terminal FD is |
773 | open on in BUF. Return 0 on success, otherwise an error number. */ |
774 | extern int ttyname_r (int __fd, char *__buf, size_t __buflen) |
775 | __THROW __nonnull ((2)) __wur; |
776 | |
777 | /* Return 1 if FD is a valid descriptor associated |
778 | with a terminal, zero if not. */ |
779 | extern int isatty (int __fd) __THROW; |
780 | |
781 | #ifdef __USE_MISC |
782 | /* Return the index into the active-logins file (utmp) for |
783 | the controlling terminal. */ |
784 | extern int ttyslot (void) __THROW; |
785 | #endif |
786 | |
787 | |
788 | /* Make a link to FROM named TO. */ |
789 | extern int link (const char *__from, const char *__to) |
790 | __THROW __nonnull ((1, 2)) __wur; |
791 | |
792 | #ifdef __USE_ATFILE |
793 | /* Like link but relative paths in TO and FROM are interpreted relative |
794 | to FROMFD and TOFD respectively. */ |
795 | extern int linkat (int __fromfd, const char *__from, int __tofd, |
796 | const char *__to, int __flags) |
797 | __THROW __nonnull ((2, 4)) __wur; |
798 | #endif |
799 | |
800 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K |
801 | /* Make a symbolic link to FROM named TO. */ |
802 | extern int symlink (const char *__from, const char *__to) |
803 | __THROW __nonnull ((1, 2)) __wur; |
804 | |
805 | /* Read the contents of the symbolic link PATH into no more than |
806 | LEN bytes of BUF. The contents are not null-terminated. |
807 | Returns the number of characters read, or -1 for errors. */ |
808 | extern ssize_t readlink (const char *__restrict __path, |
809 | char *__restrict __buf, size_t __len) |
810 | __THROW __nonnull ((1, 2)) __wur; |
811 | #endif /* Use POSIX.1-2001. */ |
812 | |
813 | #ifdef __USE_ATFILE |
814 | /* Like symlink but a relative path in TO is interpreted relative to TOFD. */ |
815 | extern int symlinkat (const char *__from, int __tofd, |
816 | const char *__to) __THROW __nonnull ((1, 3)) __wur; |
817 | |
818 | /* Like readlink but a relative PATH is interpreted relative to FD. */ |
819 | extern ssize_t readlinkat (int __fd, const char *__restrict __path, |
820 | char *__restrict __buf, size_t __len) |
821 | __THROW __nonnull ((2, 3)) __wur; |
822 | #endif |
823 | |
824 | /* Remove the link NAME. */ |
825 | extern int unlink (const char *__name) __THROW __nonnull ((1)); |
826 | |
827 | #ifdef __USE_ATFILE |
828 | /* Remove the link NAME relative to FD. */ |
829 | extern int unlinkat (int __fd, const char *__name, int __flag) |
830 | __THROW __nonnull ((2)); |
831 | #endif |
832 | |
833 | /* Remove the directory PATH. */ |
834 | extern int rmdir (const char *__path) __THROW __nonnull ((1)); |
835 | |
836 | |
837 | /* Return the foreground process group ID of FD. */ |
838 | extern __pid_t tcgetpgrp (int __fd) __THROW; |
839 | |
840 | /* Set the foreground process group ID of FD set PGRP_ID. */ |
841 | extern int tcsetpgrp (int __fd, __pid_t __pgrp_id) __THROW; |
842 | |
843 | |
844 | /* Return the login name of the user. |
845 | |
846 | This function is a possible cancellation point and therefore not |
847 | marked with __THROW. */ |
848 | extern char *getlogin (void); |
849 | #ifdef __USE_POSIX199506 |
850 | /* Return at most NAME_LEN characters of the login name of the user in NAME. |
851 | If it cannot be determined or some other error occurred, return the error |
852 | code. Otherwise return 0. |
853 | |
854 | This function is a possible cancellation point and therefore not |
855 | marked with __THROW. */ |
856 | extern int getlogin_r (char *__name, size_t __name_len) __nonnull ((1)); |
857 | #endif |
858 | |
859 | #ifdef __USE_MISC |
860 | /* Set the login name returned by `getlogin'. */ |
861 | extern int setlogin (const char *__name) __THROW __nonnull ((1)); |
862 | #endif |
863 | |
864 | |
865 | #ifdef __USE_POSIX2 |
866 | /* Get definitions and prototypes for functions to process the |
867 | arguments in ARGV (ARGC of them, minus the program name) for |
868 | options given in OPTS. */ |
869 | # include <bits/getopt_posix.h> |
870 | #endif |
871 | |
872 | |
873 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K |
874 | /* Put the name of the current host in no more than LEN bytes of NAME. |
875 | The result is null-terminated if LEN is large enough for the full |
876 | name and the terminator. */ |
877 | extern int gethostname (char *__name, size_t __len) __THROW __nonnull ((1)); |
878 | #endif |
879 | |
880 | |
881 | #if defined __USE_MISC |
882 | /* Set the name of the current host to NAME, which is LEN bytes long. |
883 | This call is restricted to the super-user. */ |
884 | extern int sethostname (const char *__name, size_t __len) |
885 | __THROW __nonnull ((1)) __wur; |
886 | |
887 | /* Set the current machine's Internet number to ID. |
888 | This call is restricted to the super-user. */ |
889 | extern int sethostid (long int __id) __THROW __wur; |
890 | |
891 | |
892 | /* Get and set the NIS (aka YP) domain name, if any. |
893 | Called just like `gethostname' and `sethostname'. |
894 | The NIS domain name is usually the empty string when not using NIS. */ |
895 | extern int getdomainname (char *__name, size_t __len) |
896 | __THROW __nonnull ((1)) __wur; |
897 | extern int setdomainname (const char *__name, size_t __len) |
898 | __THROW __nonnull ((1)) __wur; |
899 | |
900 | |
901 | /* Revoke access permissions to all processes currently communicating |
902 | with the control terminal, and then send a SIGHUP signal to the process |
903 | group of the control terminal. */ |
904 | extern int vhangup (void) __THROW; |
905 | |
906 | /* Revoke the access of all descriptors currently open on FILE. */ |
907 | extern int revoke (const char *__file) __THROW __nonnull ((1)) __wur; |
908 | |
909 | |
910 | /* Enable statistical profiling, writing samples of the PC into at most |
911 | SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling |
912 | is enabled, the system examines the user PC and increments |
913 | SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero, |
914 | disable profiling. Returns zero on success, -1 on error. */ |
915 | extern int profil (unsigned short int *__sample_buffer, size_t __size, |
916 | size_t __offset, unsigned int __scale) |
917 | __THROW __nonnull ((1)); |
918 | |
919 | |
920 | /* Turn accounting on if NAME is an existing file. The system will then write |
921 | a record for each process as it terminates, to this file. If NAME is NULL, |
922 | turn accounting off. This call is restricted to the super-user. */ |
923 | extern int acct (const char *__name) __THROW; |
924 | |
925 | |
926 | /* Successive calls return the shells listed in `/etc/shells'. */ |
927 | extern char *getusershell (void) __THROW; |
928 | extern void endusershell (void) __THROW; /* Discard cached info. */ |
929 | extern void setusershell (void) __THROW; /* Rewind and re-read the file. */ |
930 | |
931 | |
932 | /* Put the program in the background, and dissociate from the controlling |
933 | terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero, |
934 | redirects stdin, stdout, and stderr to /dev/null. */ |
935 | extern int daemon (int __nochdir, int __noclose) __THROW __wur; |
936 | #endif /* Use misc. */ |
937 | |
938 | |
939 | #if defined __USE_MISC || (defined __USE_XOPEN && !defined __USE_XOPEN2K) |
940 | /* Make PATH be the root directory (the starting point for absolute paths). |
941 | This call is restricted to the super-user. */ |
942 | extern int chroot (const char *__path) __THROW __nonnull ((1)) __wur; |
943 | |
944 | /* Prompt with PROMPT and read a string from the terminal without echoing. |
945 | Uses /dev/tty if possible; otherwise stderr and stdin. */ |
946 | extern char *getpass (const char *__prompt) __nonnull ((1)); |
947 | #endif /* Use misc || X/Open. */ |
948 | |
949 | |
950 | /* Make all changes done to FD actually appear on disk. |
951 | |
952 | This function is a cancellation point and therefore not marked with |
953 | __THROW. */ |
954 | extern int fsync (int __fd); |
955 | |
956 | |
957 | #ifdef __USE_GNU |
958 | /* Make all changes done to all files on the file system associated |
959 | with FD actually appear on disk. */ |
960 | extern int syncfs (int __fd) __THROW; |
961 | #endif |
962 | |
963 | |
964 | #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED |
965 | |
966 | /* Return identifier for the current host. */ |
967 | extern long int gethostid (void); |
968 | |
969 | /* Make all changes done to all files actually appear on disk. */ |
970 | extern void sync (void) __THROW; |
971 | |
972 | |
973 | # if defined __USE_MISC || !defined __USE_XOPEN2K |
974 | /* Return the number of bytes in a page. This is the system's page size, |
975 | which is not necessarily the same as the hardware page size. */ |
976 | extern int getpagesize (void) __THROW __attribute__ ((__const__)); |
977 | |
978 | |
979 | /* Return the maximum number of file descriptors |
980 | the current process could possibly have. */ |
981 | extern int getdtablesize (void) __THROW; |
982 | # endif |
983 | |
984 | #endif /* Use misc || X/Open Unix. */ |
985 | |
986 | |
987 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 |
988 | |
989 | /* Truncate FILE to LENGTH bytes. */ |
990 | # ifndef __USE_FILE_OFFSET64 |
991 | extern int truncate (const char *__file, __off_t __length) |
992 | __THROW __nonnull ((1)) __wur; |
993 | # else |
994 | # ifdef __REDIRECT_NTH |
995 | extern int __REDIRECT_NTH (truncate, |
996 | (const char *__file, __off64_t __length), |
997 | truncate64) __nonnull ((1)) __wur; |
998 | # else |
999 | # define truncate truncate64 |
1000 | # endif |
1001 | # endif |
1002 | # ifdef __USE_LARGEFILE64 |
1003 | extern int truncate64 (const char *__file, __off64_t __length) |
1004 | __THROW __nonnull ((1)) __wur; |
1005 | # endif |
1006 | |
1007 | #endif /* Use X/Open Unix || POSIX 2008. */ |
1008 | |
1009 | #if defined __USE_POSIX199309 \ |
1010 | || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K |
1011 | |
1012 | /* Truncate the file FD is open on to LENGTH bytes. */ |
1013 | # ifndef __USE_FILE_OFFSET64 |
1014 | extern int ftruncate (int __fd, __off_t __length) __THROW __wur; |
1015 | # else |
1016 | # ifdef __REDIRECT_NTH |
1017 | extern int __REDIRECT_NTH (ftruncate, (int __fd, __off64_t __length), |
1018 | ftruncate64) __wur; |
1019 | # else |
1020 | # define ftruncate ftruncate64 |
1021 | # endif |
1022 | # endif |
1023 | # ifdef __USE_LARGEFILE64 |
1024 | extern int ftruncate64 (int __fd, __off64_t __length) __THROW __wur; |
1025 | # endif |
1026 | |
1027 | #endif /* Use POSIX.1b || X/Open Unix || XPG6. */ |
1028 | |
1029 | |
1030 | #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K) \ |
1031 | || defined __USE_MISC |
1032 | |
1033 | /* Set the end of accessible data space (aka "the break") to ADDR. |
1034 | Returns zero on success and -1 for errors (with errno set). */ |
1035 | extern int brk (void *__addr) __THROW __wur; |
1036 | |
1037 | /* Increase or decrease the end of accessible data space by DELTA bytes. |
1038 | If successful, returns the address the previous end of data space |
1039 | (i.e. the beginning of the new space, if DELTA > 0); |
1040 | returns (void *) -1 for errors (with errno set). */ |
1041 | extern void *sbrk (intptr_t __delta) __THROW; |
1042 | #endif |
1043 | |
1044 | |
1045 | #ifdef __USE_MISC |
1046 | /* Invoke `system call' number SYSNO, passing it the remaining arguments. |
1047 | This is completely system-dependent, and not often useful. |
1048 | |
1049 | In Unix, `syscall' sets `errno' for all errors and most calls return -1 |
1050 | for errors; in many systems you cannot pass arguments or get return |
1051 | values for all system calls (`pipe', `fork', and `getppid' typically |
1052 | among them). |
1053 | |
1054 | In Mach, all system calls take normal arguments and always return an |
1055 | error code (zero for success). */ |
1056 | extern long int syscall (long int __sysno, ...) __THROW; |
1057 | |
1058 | #endif /* Use misc. */ |
1059 | |
1060 | |
1061 | #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK |
1062 | /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both |
1063 | files consistent. Some systems have them there and some here, and some |
1064 | software depends on the macros being defined without including both. */ |
1065 | |
1066 | /* `lockf' is a simpler interface to the locking facilities of `fcntl'. |
1067 | LEN is always relative to the current file position. |
1068 | The CMD argument is one of the following. |
1069 | |
1070 | This function is a cancellation point and therefore not marked with |
1071 | __THROW. */ |
1072 | |
1073 | # define F_ULOCK 0 /* Unlock a previously locked region. */ |
1074 | # define F_LOCK 1 /* Lock a region for exclusive use. */ |
1075 | # define F_TLOCK 2 /* Test and lock a region for exclusive use. */ |
1076 | # define F_TEST 3 /* Test a region for other processes locks. */ |
1077 | |
1078 | # ifndef __USE_FILE_OFFSET64 |
1079 | extern int lockf (int __fd, int __cmd, __off_t __len) __wur; |
1080 | # else |
1081 | # ifdef __REDIRECT |
1082 | extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), |
1083 | lockf64) __wur; |
1084 | # else |
1085 | # define lockf lockf64 |
1086 | # endif |
1087 | # endif |
1088 | # ifdef __USE_LARGEFILE64 |
1089 | extern int lockf64 (int __fd, int __cmd, __off64_t __len) __wur; |
1090 | # endif |
1091 | #endif /* Use misc and F_LOCK not already defined. */ |
1092 | |
1093 | |
1094 | #ifdef __USE_GNU |
1095 | |
1096 | /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno' |
1097 | set to EINTR. */ |
1098 | |
1099 | # define TEMP_FAILURE_RETRY(expression) \ |
1100 | (__extension__ \ |
1101 | ({ long int __result; \ |
1102 | do __result = (long int) (expression); \ |
1103 | while (__result == -1L && errno == EINTR); \ |
1104 | __result; })) |
1105 | |
1106 | /* Copy LENGTH bytes from INFD to OUTFD. */ |
1107 | ssize_t copy_file_range (int __infd, __off64_t *__pinoff, |
1108 | int __outfd, __off64_t *__poutoff, |
1109 | size_t __length, unsigned int __flags); |
1110 | #endif /* __USE_GNU */ |
1111 | |
1112 | #if defined __USE_POSIX199309 || defined __USE_UNIX98 |
1113 | /* Synchronize at least the data part of a file with the underlying |
1114 | media. */ |
1115 | extern int fdatasync (int __fildes); |
1116 | #endif /* Use POSIX199309 */ |
1117 | |
1118 | #ifdef __USE_MISC |
1119 | /* One-way hash PHRASE, returning a string suitable for storage in the |
1120 | user database. SALT selects the one-way function to use, and |
1121 | ensures that no two users' hashes are the same, even if they use |
1122 | the same passphrase. The return value points to static storage |
1123 | which will be overwritten by the next call to crypt. */ |
1124 | extern char *crypt (const char *__key, const char *__salt) |
1125 | __THROW __nonnull ((1, 2)); |
1126 | #endif |
1127 | |
1128 | #ifdef __USE_XOPEN |
1129 | /* Swab pairs bytes in the first N bytes of the area pointed to by |
1130 | FROM and copy the result to TO. The value of TO must not be in the |
1131 | range [FROM - N + 1, FROM - 1]. If N is odd the first byte in FROM |
1132 | is without partner. */ |
1133 | extern void swab (const void *__restrict __from, void *__restrict __to, |
1134 | ssize_t __n) __THROW __nonnull ((1, 2)); |
1135 | #endif |
1136 | |
1137 | |
1138 | /* Prior to Issue 6, the Single Unix Specification required these |
1139 | prototypes to appear in this header. They are also found in |
1140 | <stdio.h>. */ |
1141 | #if defined __USE_XOPEN && !defined __USE_XOPEN2K |
1142 | /* Return the name of the controlling terminal. */ |
1143 | extern char *ctermid (char *__s) __THROW; |
1144 | |
1145 | /* Return the name of the current user. */ |
1146 | extern char *cuserid (char *__s); |
1147 | #endif |
1148 | |
1149 | |
1150 | /* Unix98 requires this function to be declared here. In other |
1151 | standards it is in <pthread.h>. */ |
1152 | #if defined __USE_UNIX98 && !defined __USE_XOPEN2K |
1153 | extern int pthread_atfork (void (*__prepare) (void), |
1154 | void (*__parent) (void), |
1155 | void (*__child) (void)) __THROW; |
1156 | #endif |
1157 | |
1158 | #ifdef __USE_MISC |
1159 | /* Write LENGTH bytes of randomness starting at BUFFER. Return 0 on |
1160 | success or -1 on error. */ |
1161 | int getentropy (void *__buffer, size_t __length) __wur; |
1162 | #endif |
1163 | |
1164 | /* Define some macros helping to catch buffer overflows. */ |
1165 | #if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function |
1166 | # include <bits/unistd.h> |
1167 | #endif |
1168 | |
1169 | __END_DECLS |
1170 | |
1171 | #endif /* unistd.h */ |
1172 | |