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bfff8b1b | 1 | /* Copyright (C) 1991-2017 Free Software Foundation, Inc. |
2c6fe0bd | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
2c6fe0bd | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 8 | |
2c6fe0bd UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 RM |
17 | |
18 | /* | |
19 | * POSIX Standard: 2.10 Symbolic Constants <unistd.h> | |
20 | */ | |
21 | ||
22 | #ifndef _UNISTD_H | |
28f540f4 | 23 | #define _UNISTD_H 1 |
5107cf1d | 24 | |
28f540f4 RM |
25 | #include <features.h> |
26 | ||
27 | __BEGIN_DECLS | |
28 | ||
29 | /* These may be used to determine what facilities are present at compile time. | |
2c6fe0bd | 30 | Their values can be obtained at run time from `sysconf'. */ |
28f540f4 | 31 | |
c6b6723e | 32 | #ifdef __USE_XOPEN2K8 |
7db0cc42 | 33 | /* POSIX Standard approved as ISO/IEC 9945-1 as of September 2008. */ |
c6b6723e UD |
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 | |
28f540f4 RM |
48 | |
49 | /* These are not #ifdef __USE_POSIX2 because they are | |
50 | in the theoretically application-owned namespace. */ | |
51 | ||
bdc7f5d7 UD |
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 | ||
9756dfe1 | 66 | /* The utilities on GNU systems also correspond to this version. */ |
bdc7f5d7 | 67 | #define _POSIX2_VERSION __POSIX2_THIS_VERSION |
9756dfe1 | 68 | |
4e5f9259 JM |
69 | /* This symbol was required until the 2001 edition of POSIX. */ |
70 | #define _POSIX2_C_VERSION __POSIX2_THIS_VERSION | |
71 | ||
28f540f4 RM |
72 | /* If defined, the implementation supports the |
73 | C Language Bindings Option. */ | |
bdc7f5d7 | 74 | #define _POSIX2_C_BIND __POSIX2_THIS_VERSION |
28f540f4 RM |
75 | |
76 | /* If defined, the implementation supports the | |
77 | C Language Development Utilities Option. */ | |
bdc7f5d7 | 78 | #define _POSIX2_C_DEV __POSIX2_THIS_VERSION |
28f540f4 RM |
79 | |
80 | /* If defined, the implementation supports the | |
81 | Software Development Utilities Option. */ | |
bdc7f5d7 | 82 | #define _POSIX2_SW_DEV __POSIX2_THIS_VERSION |
28f540f4 | 83 | |
19bc17a9 RM |
84 | /* If defined, the implementation supports the |
85 | creation of locales with the localedef utility. */ | |
bdc7f5d7 | 86 | #define _POSIX2_LOCALEDEF __POSIX2_THIS_VERSION |
19bc17a9 | 87 | |
9756dfe1 | 88 | /* X/Open version number to which the library conforms. It is selectable. */ |
7db0cc42 UD |
89 | #ifdef __USE_XOPEN2K8 |
90 | # define _XOPEN_VERSION 700 | |
91 | #elif defined __USE_XOPEN2K | |
faf3ad69 UD |
92 | # define _XOPEN_VERSION 600 |
93 | #elif defined __USE_UNIX98 | |
9756dfe1 UD |
94 | # define _XOPEN_VERSION 500 |
95 | #else | |
96 | # define _XOPEN_VERSION 4 | |
97 | #endif | |
845dcb57 | 98 | |
2c6fe0bd UD |
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 | /* Encryption is present. */ | |
111 | #define _XOPEN_CRYPT 1 | |
112 | ||
afd4eb37 | 113 | /* The enhanced internationalization capabilities according to XPG4.2 |
2c6fe0bd UD |
114 | are present. */ |
115 | #define _XOPEN_ENH_I18N 1 | |
116 | ||
cbdee279 UD |
117 | /* The legacy interfaces are also available. */ |
118 | #define _XOPEN_LEGACY 1 | |
119 | ||
28f540f4 RM |
120 | |
121 | /* Get values of POSIX options: | |
122 | ||
123 | If these symbols are defined, the corresponding features are | |
124 | always available. If not, they may be available sometimes. | |
125 | The current values can be obtained with `sysconf'. | |
126 | ||
7b3547eb RM |
127 | _POSIX_JOB_CONTROL Job control is supported. |
128 | _POSIX_SAVED_IDS Processes have a saved set-user-ID | |
6991feeb | 129 | and a saved set-group-ID. |
7b3547eb RM |
130 | _POSIX_REALTIME_SIGNALS Real-time, queued signals are supported. |
131 | _POSIX_PRIORITY_SCHEDULING Priority scheduling is supported. | |
132 | _POSIX_TIMERS POSIX.4 clocks and timers are supported. | |
133 | _POSIX_ASYNCHRONOUS_IO Asynchronous I/O is supported. | |
134 | _POSIX_PRIORITIZED_IO Prioritized asynchronous I/O is supported. | |
135 | _POSIX_SYNCHRONIZED_IO Synchronizing file data is supported. | |
136 | _POSIX_FSYNC The fsync function is present. | |
137 | _POSIX_MAPPED_FILES Mapping of files to memory is supported. | |
138 | _POSIX_MEMLOCK Locking of all memory is supported. | |
139 | _POSIX_MEMLOCK_RANGE Locking of ranges of memory is supported. | |
140 | _POSIX_MEMORY_PROTECTION Setting of memory protections is supported. | |
141 | _POSIX_MESSAGE_PASSING POSIX.4 message queues are supported. | |
142 | _POSIX_SEMAPHORES POSIX.4 counting semaphores are supported. | |
143 | _POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported. | |
af6f3906 UD |
144 | _POSIX_THREADS POSIX.1c pthreads are supported. |
145 | _POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported. | |
146 | _POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported. | |
147 | _POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported. | |
148 | _POSIX_THREAD_PRIORITY_SCHEDULING | |
149 | POSIX.1c thread execution scheduling supported. | |
150 | _POSIX_THREAD_PRIO_INHERIT Thread priority inheritance option supported. | |
151 | _POSIX_THREAD_PRIO_PROTECT Thread priority protection option supported. | |
152 | _POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported. | |
503054c0 RM |
153 | _POSIX_PII Protocol-independent interfaces are supported. |
154 | _POSIX_PII_XTI XTI protocol-indep. interfaces are supported. | |
155 | _POSIX_PII_SOCKET Socket protocol-indep. interfaces are supported. | |
156 | _POSIX_PII_INTERNET Internet family of protocols supported. | |
157 | _POSIX_PII_INTERNET_STREAM Connection-mode Internet protocol supported. | |
158 | _POSIX_PII_INTERNET_DGRAM Connectionless Internet protocol supported. | |
159 | _POSIX_PII_OSI ISO/OSI family of protocols supported. | |
160 | _POSIX_PII_OSI_COTS Connection-mode ISO/OSI service supported. | |
161 | _POSIX_PII_OSI_CLTS Connectionless ISO/OSI service supported. | |
162 | _POSIX_POLL Implementation supports `poll' function. | |
163 | _POSIX_SELECT Implementation supports `select' and `pselect'. | |
28f540f4 | 164 | |
cbdee279 UD |
165 | _XOPEN_REALTIME X/Open realtime support is available. |
166 | _XOPEN_REALTIME_THREADS X/Open realtime thread support is available. | |
2c6fe0bd UD |
167 | _XOPEN_SHM Shared memory interface according to XPG4.2. |
168 | ||
86187531 UD |
169 | _XBS5_ILP32_OFF32 Implementation provides environment with 32-bit |
170 | int, long, pointer, and off_t types. | |
171 | _XBS5_ILP32_OFFBIG Implementation provides environment with 32-bit | |
172 | int, long, and pointer and off_t with at least | |
173 | 64 bits. | |
174 | _XBS5_LP64_OFF64 Implementation provides environment with 32-bit | |
175 | int, and 64-bit long, pointer, and off_t types. | |
176 | _XBS5_LPBIG_OFFBIG Implementation provides environment with at | |
177 | least 32 bits int and long, pointer, and off_t | |
178 | with at least 64 bits. | |
179 | ||
28f540f4 RM |
180 | If any of these symbols is defined as -1, the corresponding option is not |
181 | true for any file. If any is defined as other than -1, the corresponding | |
182 | option is true for all files. If a symbol is not defined at all, the value | |
183 | for a specific file can be obtained from `pathconf' and `fpathconf'. | |
184 | ||
185 | _POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change | |
6991feeb | 186 | the owner of a file. `chown' can only be used |
28f540f4 RM |
187 | to change the group ID of a file to a group of |
188 | which the calling process is a member. | |
189 | _POSIX_NO_TRUNC Pathname components longer than | |
6991feeb | 190 | NAME_MAX generate an error. |
28f540f4 RM |
191 | _POSIX_VDISABLE If defined, if the value of an element of the |
192 | `c_cc' member of `struct termios' is | |
193 | _POSIX_VDISABLE, no character will have the | |
194 | effect associated with that element. | |
75cd5204 RM |
195 | _POSIX_SYNC_IO Synchronous I/O may be performed. |
196 | _POSIX_ASYNC_IO Asynchronous I/O may be performed. | |
197 | _POSIX_PRIO_IO Prioritized Asynchronous I/O may be performed. | |
dfd2257a UD |
198 | |
199 | Support for the Large File Support interface is not generally available. | |
200 | If it is available the following constants are defined to one. | |
201 | _LFS64_LARGEFILE Low-level I/O supports large files. | |
202 | _LFS64_STDIO Standard I/O supports large files. | |
28f540f4 RM |
203 | */ |
204 | ||
5107cf1d | 205 | #include <bits/posix_opt.h> |
28f540f4 | 206 | |
cbdee279 | 207 | /* Get the environment definitions from Unix98. */ |
7cdb5a32 | 208 | #if defined __USE_UNIX98 || defined __USE_XOPEN2K |
cbdee279 UD |
209 | # include <bits/environments.h> |
210 | #endif | |
28f540f4 RM |
211 | |
212 | /* Standard file descriptors. */ | |
213 | #define STDIN_FILENO 0 /* Standard input. */ | |
214 | #define STDOUT_FILENO 1 /* Standard output. */ | |
215 | #define STDERR_FILENO 2 /* Standard error output. */ | |
216 | ||
217 | ||
218 | /* All functions that are not declared anywhere else. */ | |
219 | ||
5107cf1d | 220 | #include <bits/types.h> |
28f540f4 | 221 | |
7df789e0 | 222 | #ifndef __ssize_t_defined |
a68b0d31 | 223 | typedef __ssize_t ssize_t; |
7df789e0 | 224 | # define __ssize_t_defined |
28f540f4 RM |
225 | #endif |
226 | ||
227 | #define __need_size_t | |
228 | #define __need_NULL | |
229 | #include <stddef.h> | |
230 | ||
7a80496f | 231 | #if defined __USE_XOPEN || defined __USE_XOPEN2K |
a5a0310d UD |
232 | /* The Single Unix specification says that some more types are |
233 | available here. */ | |
7df789e0 | 234 | # ifndef __gid_t_defined |
a5a0310d | 235 | typedef __gid_t gid_t; |
7df789e0 | 236 | # define __gid_t_defined |
a5a0310d UD |
237 | # endif |
238 | ||
7df789e0 | 239 | # ifndef __uid_t_defined |
a5a0310d | 240 | typedef __uid_t uid_t; |
7df789e0 | 241 | # define __uid_t_defined |
a5a0310d UD |
242 | # endif |
243 | ||
7df789e0 | 244 | # ifndef __off_t_defined |
dfd2257a | 245 | # ifndef __USE_FILE_OFFSET64 |
a5a0310d | 246 | typedef __off_t off_t; |
dfd2257a UD |
247 | # else |
248 | typedef __off64_t off_t; | |
249 | # endif | |
7df789e0 | 250 | # define __off_t_defined |
a5a0310d | 251 | # endif |
7df789e0 | 252 | # if defined __USE_LARGEFILE64 && !defined __off64_t_defined |
dfd2257a | 253 | typedef __off64_t off64_t; |
7df789e0 | 254 | # define __off64_t_defined |
dfd2257a | 255 | # endif |
a5a0310d | 256 | |
7707af89 UD |
257 | # ifndef __useconds_t_defined |
258 | typedef __useconds_t useconds_t; | |
259 | # define __useconds_t_defined | |
260 | # endif | |
261 | ||
7df789e0 | 262 | # ifndef __pid_t_defined |
a5a0310d | 263 | typedef __pid_t pid_t; |
7df789e0 | 264 | # define __pid_t_defined |
a5a0310d | 265 | # endif |
e918a7fe | 266 | #endif /* X/Open */ |
4bae5567 | 267 | |
acd7f096 | 268 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K |
7df789e0 | 269 | # ifndef __intptr_t_defined |
4bae5567 | 270 | typedef __intptr_t intptr_t; |
7df789e0 | 271 | # define __intptr_t_defined |
4bae5567 | 272 | # endif |
4c63ebaa | 273 | #endif |
28f540f4 | 274 | |
498afc54 | 275 | #if defined __USE_MISC || defined __USE_XOPEN |
750f9af6 UD |
276 | # ifndef __socklen_t_defined |
277 | typedef __socklen_t socklen_t; | |
278 | # define __socklen_t_defined | |
279 | # endif | |
280 | #endif | |
281 | ||
28f540f4 RM |
282 | /* Values for the second argument to access. |
283 | These may be OR'd together. */ | |
284 | #define R_OK 4 /* Test for read permission. */ | |
285 | #define W_OK 2 /* Test for write permission. */ | |
286 | #define X_OK 1 /* Test for execute permission. */ | |
287 | #define F_OK 0 /* Test for existence. */ | |
288 | ||
22a1292a | 289 | /* Test for access to NAME using the real UID and real GID. */ |
a784e502 | 290 | extern int access (const char *__name, int __type) __THROW __nonnull ((1)); |
28f540f4 | 291 | |
22a1292a RM |
292 | #ifdef __USE_GNU |
293 | /* Test for access to NAME using the effective UID and GID | |
294 | (as normal file operations use). */ | |
a784e502 | 295 | extern int euidaccess (const char *__name, int __type) |
8a1f658b | 296 | __THROW __nonnull ((1)); |
cb483e04 RM |
297 | |
298 | /* An alias for `euidaccess', used by some other systems. */ | |
a784e502 | 299 | extern int eaccess (const char *__name, int __type) |
cb483e04 | 300 | __THROW __nonnull ((1)); |
22a1292a RM |
301 | #endif |
302 | ||
d15b99ac RM |
303 | #ifdef __USE_ATFILE |
304 | /* Test for access to FILE relative to the directory FD is open on. | |
305 | If AT_EACCESS is set in FLAG, then use effective IDs like `eaccess', | |
306 | otherwise use real IDs like `access'. */ | |
a784e502 | 307 | extern int faccessat (int __fd, const char *__file, int __type, int __flag) |
d15b99ac RM |
308 | __THROW __nonnull ((2)) __wur; |
309 | #endif /* Use GNU. */ | |
310 | ||
28f540f4 RM |
311 | |
312 | /* Values for the WHENCE argument to lseek. */ | |
313 | #ifndef _STDIO_H /* <stdio.h> has the same definitions. */ | |
a5a0310d UD |
314 | # define SEEK_SET 0 /* Seek from beginning of file. */ |
315 | # define SEEK_CUR 1 /* Seek from current position. */ | |
316 | # define SEEK_END 2 /* Seek from end of file. */ | |
798be72d UD |
317 | # ifdef __USE_GNU |
318 | # define SEEK_DATA 3 /* Seek to next data. */ | |
319 | # define SEEK_HOLE 4 /* Seek to next hole. */ | |
320 | # endif | |
28f540f4 RM |
321 | #endif |
322 | ||
498afc54 | 323 | #if defined __USE_MISC && !defined L_SET |
1474b80f | 324 | /* Old BSD names for the same constants; just for compatibility. */ |
a5a0310d UD |
325 | # define L_SET SEEK_SET |
326 | # define L_INCR SEEK_CUR | |
327 | # define L_XTND SEEK_END | |
1474b80f RM |
328 | #endif |
329 | ||
330 | ||
28f540f4 RM |
331 | /* Move FD's file position to OFFSET bytes from the |
332 | beginning of the file (if WHENCE is SEEK_SET), | |
333 | the current position (if WHENCE is SEEK_CUR), | |
334 | or the end of the file (if WHENCE is SEEK_END). | |
335 | Return the new file position. */ | |
dfd2257a | 336 | #ifndef __USE_FILE_OFFSET64 |
c1422e5b | 337 | extern __off_t lseek (int __fd, __off_t __offset, int __whence) __THROW; |
dfd2257a | 338 | #else |
f377d022 UD |
339 | # ifdef __REDIRECT_NTH |
340 | extern __off64_t __REDIRECT_NTH (lseek, | |
341 | (int __fd, __off64_t __offset, int __whence), | |
342 | lseek64); | |
01cad722 UD |
343 | # else |
344 | # define lseek lseek64 | |
345 | # endif | |
dfd2257a UD |
346 | #endif |
347 | #ifdef __USE_LARGEFILE64 | |
0476597b UD |
348 | extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence) |
349 | __THROW; | |
dfd2257a | 350 | #endif |
28f540f4 | 351 | |
2c008571 UD |
352 | /* Close the file descriptor FD. |
353 | ||
354 | This function is a cancellation point and therefore not marked with | |
355 | __THROW. */ | |
356 | extern int close (int __fd); | |
28f540f4 RM |
357 | |
358 | /* Read NBYTES into BUF from FD. Return the | |
2c008571 UD |
359 | number read, -1 for errors or 0 for EOF. |
360 | ||
361 | This function is a cancellation point and therefore not marked with | |
362 | __THROW. */ | |
0476597b | 363 | extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur; |
2c008571 UD |
364 | |
365 | /* Write N bytes of BUF to FD. Return the number written, or -1. | |
28f540f4 | 366 | |
2c008571 UD |
367 | This function is a cancellation point and therefore not marked with |
368 | __THROW. */ | |
a784e502 | 369 | extern ssize_t write (int __fd, const void *__buf, size_t __n) __wur; |
28f540f4 | 370 | |
7cdb5a32 | 371 | #if defined __USE_UNIX98 || defined __USE_XOPEN2K8 |
dfd2257a | 372 | # ifndef __USE_FILE_OFFSET64 |
2c008571 UD |
373 | /* Read NBYTES into BUF from FD at the given position OFFSET without |
374 | changing the file pointer. Return the number read, -1 for errors | |
375 | or 0 for EOF. | |
376 | ||
377 | This function is a cancellation point and therefore not marked with | |
378 | __THROW. */ | |
379 | extern ssize_t pread (int __fd, void *__buf, size_t __nbytes, | |
0476597b | 380 | __off_t __offset) __wur; |
2c008571 UD |
381 | |
382 | /* Write N bytes of BUF to FD at the given position OFFSET without | |
383 | changing the file pointer. Return the number written, or -1. | |
384 | ||
385 | This function is a cancellation point and therefore not marked with | |
386 | __THROW. */ | |
a784e502 | 387 | extern ssize_t pwrite (int __fd, const void *__buf, size_t __n, |
0476597b | 388 | __off_t __offset) __wur; |
dfd2257a | 389 | # else |
01cad722 | 390 | # ifdef __REDIRECT |
c1422e5b | 391 | extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes, |
2c008571 | 392 | __off64_t __offset), |
0476597b | 393 | pread64) __wur; |
a784e502 | 394 | extern ssize_t __REDIRECT (pwrite, (int __fd, const void *__buf, |
2c008571 | 395 | size_t __nbytes, __off64_t __offset), |
0476597b | 396 | pwrite64) __wur; |
01cad722 UD |
397 | # else |
398 | # define pread pread64 | |
399 | # define pwrite pwrite64 | |
400 | # endif | |
dfd2257a | 401 | # endif |
01cad722 | 402 | |
dfd2257a | 403 | # ifdef __USE_LARGEFILE64 |
6991feeb AJ |
404 | /* Read NBYTES into BUF from FD at the given position OFFSET without |
405 | changing the file pointer. Return the number read, -1 for errors | |
406 | or 0 for EOF. */ | |
c1422e5b | 407 | extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes, |
0476597b | 408 | __off64_t __offset) __wur; |
6991feeb AJ |
409 | /* Write N bytes of BUF to FD at the given position OFFSET without |
410 | changing the file pointer. Return the number written, or -1. */ | |
a784e502 | 411 | extern ssize_t pwrite64 (int __fd, const void *__buf, size_t __n, |
0476597b | 412 | __off64_t __offset) __wur; |
dfd2257a | 413 | # endif |
a5a0310d UD |
414 | #endif |
415 | ||
28f540f4 | 416 | /* Create a one-way communication channel (pipe). |
6d52618b | 417 | If successful, two file descriptors are stored in PIPEDES; |
28f540f4 RM |
418 | bytes written on PIPEDES[1] can be read from PIPEDES[0]. |
419 | Returns 0 if successful, -1 if not. */ | |
0476597b | 420 | extern int pipe (int __pipedes[2]) __THROW __wur; |
28f540f4 | 421 | |
bdcebfc4 UD |
422 | #ifdef __USE_GNU |
423 | /* Same as pipe but apply flags passed in FLAGS to the new file | |
424 | descriptors. */ | |
425 | extern int pipe2 (int __pipedes[2], int __flags) __THROW __wur; | |
426 | #endif | |
427 | ||
28f540f4 RM |
428 | /* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM. |
429 | If SECONDS is zero, any currently scheduled alarm will be cancelled. | |
430 | The function returns the number of seconds remaining until the last | |
431 | alarm scheduled would have signaled, or zero if there wasn't one. | |
432 | There is no return value to indicate an error, but you can set `errno' | |
433 | to 0 and check its value after calling `alarm', and this might tell you. | |
434 | The signal may come late due to processor scheduling. */ | |
c1422e5b | 435 | extern unsigned int alarm (unsigned int __seconds) __THROW; |
28f540f4 RM |
436 | |
437 | /* Make the process sleep for SECONDS seconds, or until a signal arrives | |
438 | and is not ignored. The function returns the number of seconds less | |
439 | than SECONDS which it actually slept (thus zero if it slept the full time). | |
440 | If a signal handler does a `longjmp' or modifies the handling of the | |
441 | SIGALRM signal while inside `sleep' call, the handling of the SIGALRM | |
442 | signal afterwards is undefined. There is no return value to indicate | |
2c008571 UD |
443 | error, but if `sleep' returns SECONDS, it probably didn't work. |
444 | ||
445 | This function is a cancellation point and therefore not marked with | |
446 | __THROW. */ | |
447 | extern unsigned int sleep (unsigned int __seconds); | |
28f540f4 | 448 | |
6a7007d7 | 449 | #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \ |
498afc54 | 450 | || defined __USE_MISC |
2c6fe0bd UD |
451 | /* Set an alarm to go off (generating a SIGALRM signal) in VALUE |
452 | microseconds. If INTERVAL is nonzero, when the alarm goes off, the | |
453 | timer is reset to go off every INTERVAL microseconds thereafter. | |
454 | Returns the number of microseconds remaining before the alarm. */ | |
c1422e5b UD |
455 | extern __useconds_t ualarm (__useconds_t __value, __useconds_t __interval) |
456 | __THROW; | |
2c6fe0bd | 457 | |
52e9a9d1 | 458 | /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked |
2c008571 UD |
459 | or ignored. |
460 | ||
461 | This function is a cancellation point and therefore not marked with | |
462 | __THROW. */ | |
463 | extern int usleep (__useconds_t __useconds); | |
52e9a9d1 RM |
464 | #endif |
465 | ||
28f540f4 RM |
466 | |
467 | /* Suspend the process until a signal arrives. | |
2c008571 UD |
468 | This always returns -1 and sets `errno' to EINTR. |
469 | ||
470 | This function is a cancellation point and therefore not marked with | |
471 | __THROW. */ | |
472 | extern int pause (void); | |
28f540f4 RM |
473 | |
474 | ||
475 | /* Change the owner and group of FILE. */ | |
a784e502 | 476 | extern int chown (const char *__file, __uid_t __owner, __gid_t __group) |
0476597b | 477 | __THROW __nonnull ((1)) __wur; |
28f540f4 | 478 | |
acd7f096 | 479 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 |
28f540f4 | 480 | /* Change the owner and group of the file that FD is open on. */ |
0476597b | 481 | extern int fchown (int __fd, __uid_t __owner, __gid_t __group) __THROW __wur; |
2c6fe0bd UD |
482 | |
483 | ||
484 | /* Change owner and group of FILE, if it is a symbolic | |
485 | link the ownership of the symbolic link is changed. */ | |
a784e502 | 486 | extern int lchown (const char *__file, __uid_t __owner, __gid_t __group) |
0476597b | 487 | __THROW __nonnull ((1)) __wur; |
2c6fe0bd | 488 | |
acd7f096 | 489 | #endif /* Use X/Open Unix. */ |
28f540f4 | 490 | |
0b8f25bb | 491 | #ifdef __USE_ATFILE |
26cec518 UD |
492 | /* Change the owner and group of FILE relative to the directory FD is open |
493 | on. */ | |
a784e502 | 494 | extern int fchownat (int __fd, const char *__file, __uid_t __owner, |
26cec518 UD |
495 | __gid_t __group, int __flag) |
496 | __THROW __nonnull ((2)) __wur; | |
497 | #endif /* Use GNU. */ | |
498 | ||
28f540f4 | 499 | /* Change the process's working directory to PATH. */ |
a784e502 | 500 | extern int chdir (const char *__path) __THROW __nonnull ((1)) __wur; |
28f540f4 | 501 | |
acd7f096 | 502 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 |
28f540f4 | 503 | /* Change the process's working directory to the one FD is open on. */ |
0476597b | 504 | extern int fchdir (int __fd) __THROW __wur; |
28f540f4 RM |
505 | #endif |
506 | ||
507 | /* Get the pathname of the current working directory, | |
508 | and put it in SIZE bytes of BUF. Returns NULL if the | |
509 | directory couldn't be determined or SIZE was too small. | |
510 | If successful, returns BUF. In GNU, if BUF is NULL, | |
511 | an array is allocated with `malloc'; the array is SIZE | |
714a562f | 512 | bytes long, unless SIZE == 0, in which case it is as |
28f540f4 | 513 | big as necessary. */ |
0476597b | 514 | extern char *getcwd (char *__buf, size_t __size) __THROW __wur; |
28f540f4 RM |
515 | |
516 | #ifdef __USE_GNU | |
517 | /* Return a malloc'd string containing the current directory name. | |
518 | If the environment variable `PWD' is set, and its value is correct, | |
519 | that value is used. */ | |
c1422e5b | 520 | extern char *get_current_dir_name (void) __THROW; |
28f540f4 RM |
521 | #endif |
522 | ||
6a7007d7 | 523 | #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \ |
498afc54 | 524 | || defined __USE_MISC |
28f540f4 RM |
525 | /* Put the absolute pathname of the current working directory in BUF. |
526 | If successful, return BUF. If not, put an error message in | |
527 | BUF and return NULL. BUF should be at least PATH_MAX bytes long. */ | |
0476597b UD |
528 | extern char *getwd (char *__buf) |
529 | __THROW __nonnull ((1)) __attribute_deprecated__ __wur; | |
28f540f4 RM |
530 | #endif |
531 | ||
532 | ||
533 | /* Duplicate FD, returning a new file descriptor on the same file. */ | |
0476597b | 534 | extern int dup (int __fd) __THROW __wur; |
28f540f4 RM |
535 | |
536 | /* Duplicate FD to FD2, closing FD2 and making it open on the same file. */ | |
e2070ca2 | 537 | extern int dup2 (int __fd, int __fd2) __THROW; |
28f540f4 | 538 | |
bdcebfc4 UD |
539 | #ifdef __USE_GNU |
540 | /* Duplicate FD to FD2, closing FD2 and making it open on the same | |
541 | file while setting flags according to FLAGS. */ | |
542 | extern int dup3 (int __fd, int __fd2, int __flags) __THROW; | |
543 | #endif | |
544 | ||
28f540f4 RM |
545 | /* NULL-terminated array of "NAME=VALUE" environment variables. */ |
546 | extern char **__environ; | |
df4ef2ab UD |
547 | #ifdef __USE_GNU |
548 | extern char **environ; | |
549 | #endif | |
28f540f4 RM |
550 | |
551 | ||
552 | /* Replace the current process, executing PATH with arguments ARGV and | |
553 | environment ENVP. ARGV and ENVP are terminated by NULL pointers. */ | |
a784e502 UD |
554 | extern int execve (const char *__path, char *const __argv[], |
555 | char *const __envp[]) __THROW __nonnull ((1, 2)); | |
28f540f4 | 556 | |
6cbe890a | 557 | #ifdef __USE_XOPEN2K8 |
28f540f4 RM |
558 | /* Execute the file FD refers to, overlaying the running program image. |
559 | ARGV and ENVP are passed to the new program, as for `execve'. */ | |
a784e502 | 560 | extern int fexecve (int __fd, char *const __argv[], char *const __envp[]) |
4940d71b | 561 | __THROW __nonnull ((2)); |
28f540f4 RM |
562 | #endif |
563 | ||
564 | ||
565 | /* Execute PATH with arguments ARGV and environment from `environ'. */ | |
a784e502 | 566 | extern int execv (const char *__path, char *const __argv[]) |
4940d71b | 567 | __THROW __nonnull ((1, 2)); |
28f540f4 RM |
568 | |
569 | /* Execute PATH with all arguments after PATH until a NULL pointer, | |
570 | and the argument after that for environment. */ | |
a784e502 | 571 | extern int execle (const char *__path, const char *__arg, ...) |
4940d71b | 572 | __THROW __nonnull ((1, 2)); |
28f540f4 RM |
573 | |
574 | /* Execute PATH with all arguments after PATH until | |
575 | a NULL pointer and environment from `environ'. */ | |
a784e502 | 576 | extern int execl (const char *__path, const char *__arg, ...) |
4940d71b | 577 | __THROW __nonnull ((1, 2)); |
28f540f4 RM |
578 | |
579 | /* Execute FILE, searching in the `PATH' environment variable if it contains | |
580 | no slashes, with arguments ARGV and environment from `environ'. */ | |
a784e502 | 581 | extern int execvp (const char *__file, char *const __argv[]) |
4940d71b | 582 | __THROW __nonnull ((1, 2)); |
28f540f4 RM |
583 | |
584 | /* Execute FILE, searching in the `PATH' environment variable if | |
585 | it contains no slashes, with all arguments after FILE until a | |
586 | NULL pointer and environment from `environ'. */ | |
a784e502 | 587 | extern int execlp (const char *__file, const char *__arg, ...) |
4940d71b | 588 | __THROW __nonnull ((1, 2)); |
28f540f4 | 589 | |
3d5243d4 UD |
590 | #ifdef __USE_GNU |
591 | /* Execute FILE, searching in the `PATH' environment variable if it contains | |
592 | no slashes, with arguments ARGV and environment from `environ'. */ | |
a784e502 UD |
593 | extern int execvpe (const char *__file, char *const __argv[], |
594 | char *const __envp[]) | |
4940d71b | 595 | __THROW __nonnull ((1, 2)); |
3d5243d4 UD |
596 | #endif |
597 | ||
28f540f4 | 598 | |
0d8733c4 | 599 | #if defined __USE_MISC || defined __USE_XOPEN |
a3e59be8 | 600 | /* Add INC to priority of the current process. */ |
0476597b | 601 | extern int nice (int __inc) __THROW __wur; |
a3e59be8 UD |
602 | #endif |
603 | ||
604 | ||
28f540f4 | 605 | /* Terminate program execution with the low-order 8 bits of STATUS. */ |
c1422e5b | 606 | extern void _exit (int __status) __attribute__ ((__noreturn__)); |
28f540f4 RM |
607 | |
608 | ||
609 | /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf'; | |
610 | the `_SC_*' symbols for the NAME argument to `sysconf'; | |
611 | and the `_CS_*' symbols for the NAME argument to `confstr'. */ | |
5107cf1d | 612 | #include <bits/confname.h> |
28f540f4 RM |
613 | |
614 | /* Get file-specific configuration information about PATH. */ | |
a784e502 | 615 | extern long int pathconf (const char *__path, int __name) |
8a1f658b | 616 | __THROW __nonnull ((1)); |
28f540f4 RM |
617 | |
618 | /* Get file-specific configuration about descriptor FD. */ | |
966f66bb | 619 | extern long int fpathconf (int __fd, int __name) __THROW; |
28f540f4 RM |
620 | |
621 | /* Get the value of the system variable NAME. */ | |
11bf311e | 622 | extern long int sysconf (int __name) __THROW; |
28f540f4 RM |
623 | |
624 | #ifdef __USE_POSIX2 | |
625 | /* Get the value of the string-valued system variable NAME. */ | |
c1422e5b | 626 | extern size_t confstr (int __name, char *__buf, size_t __len) __THROW; |
28f540f4 RM |
627 | #endif |
628 | ||
629 | ||
630 | /* Get the process ID of the calling process. */ | |
c1422e5b | 631 | extern __pid_t getpid (void) __THROW; |
28f540f4 RM |
632 | |
633 | /* Get the process ID of the calling process's parent. */ | |
c1422e5b | 634 | extern __pid_t getppid (void) __THROW; |
28f540f4 | 635 | |
7011c262 | 636 | /* Get the process group ID of the calling process. */ |
c1422e5b | 637 | extern __pid_t getpgrp (void) __THROW; |
28f540f4 | 638 | |
28f540f4 | 639 | /* Get the process group ID of process PID. */ |
c1422e5b | 640 | extern __pid_t __getpgid (__pid_t __pid) __THROW; |
7cdb5a32 | 641 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 |
c1422e5b | 642 | extern __pid_t getpgid (__pid_t __pid) __THROW; |
28f540f4 RM |
643 | #endif |
644 | ||
01cad722 UD |
645 | |
646 | /* Set the process group ID of the process matching PID to PGID. | |
647 | If PID is zero, the current process's process group ID is set. | |
648 | If PGID is zero, the process ID of the process is used. */ | |
c1422e5b | 649 | extern int setpgid (__pid_t __pid, __pid_t __pgid) __THROW; |
01cad722 | 650 | |
ed9a38e2 | 651 | #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED |
b20e47cb RM |
652 | /* Both System V and BSD have `setpgrp' functions, but with different |
653 | calling conventions. The BSD function is the same as POSIX.1 `setpgid' | |
654 | (above). The System V function takes no arguments and puts the calling | |
655 | process in its on group like `setpgid (0, 0)'. | |
656 | ||
657 | New programs should always use `setpgid' instead. | |
658 | ||
7011c262 | 659 | GNU provides the POSIX.1 function. */ |
b20e47cb RM |
660 | |
661 | /* Set the process group ID of the calling process to its own PID. | |
662 | This is exactly the same as `setpgid (0, 0)'. */ | |
c1422e5b | 663 | extern int setpgrp (void) __THROW; |
b20e47cb | 664 | |
acd7f096 | 665 | #endif /* Use misc or X/Open. */ |
28f540f4 RM |
666 | |
667 | /* Create a new session with the calling process as its leader. | |
668 | The process group IDs of the session and the calling process | |
669 | are set to the process ID of the calling process, which is returned. */ | |
c1422e5b | 670 | extern __pid_t setsid (void) __THROW; |
28f540f4 | 671 | |
7cdb5a32 | 672 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 |
b7843ea9 | 673 | /* Return the session ID of the given process. */ |
c1422e5b | 674 | extern __pid_t getsid (__pid_t __pid) __THROW; |
b7843ea9 RM |
675 | #endif |
676 | ||
28f540f4 | 677 | /* Get the real user ID of the calling process. */ |
c1422e5b | 678 | extern __uid_t getuid (void) __THROW; |
28f540f4 RM |
679 | |
680 | /* Get the effective user ID of the calling process. */ | |
c1422e5b | 681 | extern __uid_t geteuid (void) __THROW; |
28f540f4 RM |
682 | |
683 | /* Get the real group ID of the calling process. */ | |
c1422e5b | 684 | extern __gid_t getgid (void) __THROW; |
28f540f4 RM |
685 | |
686 | /* Get the effective group ID of the calling process. */ | |
c1422e5b | 687 | extern __gid_t getegid (void) __THROW; |
28f540f4 RM |
688 | |
689 | /* If SIZE is zero, return the number of supplementary groups | |
690 | the calling process is in. Otherwise, fill in the group IDs | |
691 | of its supplementary groups in LIST and return the number written. */ | |
0476597b | 692 | extern int getgroups (int __size, __gid_t __list[]) __THROW __wur; |
28f540f4 | 693 | |
3bbceb12 RM |
694 | #ifdef __USE_GNU |
695 | /* Return nonzero iff the calling process is in group GID. */ | |
c1422e5b | 696 | extern int group_member (__gid_t __gid) __THROW; |
3bbceb12 RM |
697 | #endif |
698 | ||
28f540f4 RM |
699 | /* Set the user ID of the calling process to UID. |
700 | If the calling process is the super-user, set the real | |
701 | and effective user IDs, and the saved set-user-ID to UID; | |
702 | if not, the effective user ID is set to UID. */ | |
7e66ee51 | 703 | extern int setuid (__uid_t __uid) __THROW __wur; |
28f540f4 | 704 | |
498afc54 | 705 | #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED |
28f540f4 RM |
706 | /* Set the real user ID of the calling process to RUID, |
707 | and the effective user ID of the calling process to EUID. */ | |
7e66ee51 | 708 | extern int setreuid (__uid_t __ruid, __uid_t __euid) __THROW __wur; |
2c6fe0bd | 709 | #endif |
28f540f4 | 710 | |
acd7f096 | 711 | #ifdef __USE_XOPEN2K |
28f540f4 | 712 | /* Set the effective user ID of the calling process to UID. */ |
7e66ee51 | 713 | extern int seteuid (__uid_t __uid) __THROW __wur; |
acd7f096 | 714 | #endif /* Use POSIX.1-2001. */ |
28f540f4 RM |
715 | |
716 | /* Set the group ID of the calling process to GID. | |
717 | If the calling process is the super-user, set the real | |
718 | and effective group IDs, and the saved set-group-ID to GID; | |
719 | if not, the effective group ID is set to GID. */ | |
7e66ee51 | 720 | extern int setgid (__gid_t __gid) __THROW __wur; |
28f540f4 | 721 | |
498afc54 | 722 | #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED |
28f540f4 RM |
723 | /* Set the real group ID of the calling process to RGID, |
724 | and the effective group ID of the calling process to EGID. */ | |
7e66ee51 | 725 | extern int setregid (__gid_t __rgid, __gid_t __egid) __THROW __wur; |
2c6fe0bd | 726 | #endif |
28f540f4 | 727 | |
acd7f096 | 728 | #ifdef __USE_XOPEN2K |
28f540f4 | 729 | /* Set the effective group ID of the calling process to GID. */ |
7e66ee51 | 730 | extern int setegid (__gid_t __gid) __THROW __wur; |
acd7f096 | 731 | #endif /* Use POSIX.1-2001. */ |
28f540f4 | 732 | |
747bf98e | 733 | #ifdef __USE_GNU |
0d5cb2c7 | 734 | /* Fetch the real user ID, effective user ID, and saved-set user ID, |
747bf98e | 735 | of the calling process. */ |
0d5cb2c7 | 736 | extern int getresuid (__uid_t *__ruid, __uid_t *__euid, __uid_t *__suid) |
0476597b | 737 | __THROW; |
747bf98e | 738 | |
0d5cb2c7 | 739 | /* Fetch the real group ID, effective group ID, and saved-set group ID, |
747bf98e | 740 | of the calling process. */ |
0d5cb2c7 | 741 | extern int getresgid (__gid_t *__rgid, __gid_t *__egid, __gid_t *__sgid) |
0476597b | 742 | __THROW; |
747bf98e | 743 | |
0d5cb2c7 RM |
744 | /* Set the real user ID, effective user ID, and saved-set user ID, |
745 | of the calling process to RUID, EUID, and SUID, respectively. */ | |
746 | extern int setresuid (__uid_t __ruid, __uid_t __euid, __uid_t __suid) | |
7e66ee51 | 747 | __THROW __wur; |
747bf98e | 748 | |
0d5cb2c7 RM |
749 | /* Set the real group ID, effective group ID, and saved-set group ID, |
750 | of the calling process to RGID, EGID, and SGID, respectively. */ | |
751 | extern int setresgid (__gid_t __rgid, __gid_t __egid, __gid_t __sgid) | |
7e66ee51 | 752 | __THROW __wur; |
747bf98e RM |
753 | #endif |
754 | ||
28f540f4 RM |
755 | |
756 | /* Clone the calling process, creating an exact copy. | |
757 | Return -1 for errors, 0 to the new process, | |
758 | and the process ID of the new process to the old process. */ | |
3871f58f | 759 | extern __pid_t fork (void) __THROWNL; |
28f540f4 | 760 | |
6a7007d7 | 761 | #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \ |
498afc54 | 762 | || defined __USE_MISC |
28f540f4 | 763 | /* Clone the calling process, but without copying the whole address space. |
05fdf2df | 764 | The calling process is suspended until the new process exits or is |
28f540f4 RM |
765 | replaced by a call to `execve'. Return -1 for errors, 0 to the new process, |
766 | and the process ID of the new process to the old process. */ | |
c1422e5b | 767 | extern __pid_t vfork (void) __THROW; |
acd7f096 | 768 | #endif /* Use misc or XPG < 7. */ |
28f540f4 RM |
769 | |
770 | ||
771 | /* Return the pathname of the terminal FD is open on, or NULL on errors. | |
73299943 UD |
772 | The returned storage is good only until the next call to this function. */ |
773 | extern char *ttyname (int __fd) __THROW; | |
9d187dd4 | 774 | |
60478656 | 775 | /* Store at most BUFLEN characters of the pathname of the terminal FD is |
73299943 | 776 | open on in BUF. Return 0 on success, otherwise an error number. */ |
8a1f658b | 777 | extern int ttyname_r (int __fd, char *__buf, size_t __buflen) |
0476597b | 778 | __THROW __nonnull ((2)) __wur; |
28f540f4 RM |
779 | |
780 | /* Return 1 if FD is a valid descriptor associated | |
781 | with a terminal, zero if not. */ | |
c1422e5b | 782 | extern int isatty (int __fd) __THROW; |
28f540f4 | 783 | |
4242d968 | 784 | #ifdef __USE_MISC |
1474b80f | 785 | /* Return the index into the active-logins file (utmp) for |
a9df8829 | 786 | the controlling terminal. */ |
c1422e5b | 787 | extern int ttyslot (void) __THROW; |
1474b80f RM |
788 | #endif |
789 | ||
28f540f4 RM |
790 | |
791 | /* Make a link to FROM named TO. */ | |
a784e502 | 792 | extern int link (const char *__from, const char *__to) |
0476597b | 793 | __THROW __nonnull ((1, 2)) __wur; |
28f540f4 | 794 | |
0b8f25bb | 795 | #ifdef __USE_ATFILE |
5c46041a UD |
796 | /* Like link but relative paths in TO and FROM are interpreted relative |
797 | to FROMFD and TOFD respectively. */ | |
a784e502 UD |
798 | extern int linkat (int __fromfd, const char *__from, int __tofd, |
799 | const char *__to, int __flags) | |
5733ab93 | 800 | __THROW __nonnull ((2, 4)) __wur; |
5c46041a UD |
801 | #endif |
802 | ||
acd7f096 | 803 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K |
28f540f4 | 804 | /* Make a symbolic link to FROM named TO. */ |
a784e502 | 805 | extern int symlink (const char *__from, const char *__to) |
0476597b | 806 | __THROW __nonnull ((1, 2)) __wur; |
28f540f4 RM |
807 | |
808 | /* Read the contents of the symbolic link PATH into no more than | |
809 | LEN bytes of BUF. The contents are not null-terminated. | |
810 | Returns the number of characters read, or -1 for errors. */ | |
a784e502 | 811 | extern ssize_t readlink (const char *__restrict __path, |
6d893bd9 UD |
812 | char *__restrict __buf, size_t __len) |
813 | __THROW __nonnull ((1, 2)) __wur; | |
acd7f096 | 814 | #endif /* Use POSIX.1-2001. */ |
28f540f4 | 815 | |
0b8f25bb | 816 | #ifdef __USE_ATFILE |
5c46041a | 817 | /* Like symlink but a relative path in TO is interpreted relative to TOFD. */ |
a784e502 UD |
818 | extern int symlinkat (const char *__from, int __tofd, |
819 | const char *__to) __THROW __nonnull ((1, 3)) __wur; | |
5c46041a UD |
820 | |
821 | /* Like readlink but a relative PATH is interpreted relative to FD. */ | |
a784e502 | 822 | extern ssize_t readlinkat (int __fd, const char *__restrict __path, |
6d893bd9 | 823 | char *__restrict __buf, size_t __len) |
5c46041a UD |
824 | __THROW __nonnull ((2, 3)) __wur; |
825 | #endif | |
826 | ||
28f540f4 | 827 | /* Remove the link NAME. */ |
a784e502 | 828 | extern int unlink (const char *__name) __THROW __nonnull ((1)); |
28f540f4 | 829 | |
0b8f25bb | 830 | #ifdef __USE_ATFILE |
26cec518 | 831 | /* Remove the link NAME relative to FD. */ |
a784e502 | 832 | extern int unlinkat (int __fd, const char *__name, int __flag) |
26cec518 UD |
833 | __THROW __nonnull ((2)); |
834 | #endif | |
835 | ||
28f540f4 | 836 | /* Remove the directory PATH. */ |
a784e502 | 837 | extern int rmdir (const char *__path) __THROW __nonnull ((1)); |
28f540f4 RM |
838 | |
839 | ||
840 | /* Return the foreground process group ID of FD. */ | |
c1422e5b | 841 | extern __pid_t tcgetpgrp (int __fd) __THROW; |
28f540f4 RM |
842 | |
843 | /* Set the foreground process group ID of FD set PGRP_ID. */ | |
c1422e5b | 844 | extern int tcsetpgrp (int __fd, __pid_t __pgrp_id) __THROW; |
28f540f4 RM |
845 | |
846 | ||
2c008571 UD |
847 | /* Return the login name of the user. |
848 | ||
4c1423ed | 849 | This function is a possible cancellation point and therefore not |
2c008571 UD |
850 | marked with __THROW. */ |
851 | extern char *getlogin (void); | |
c0307377 | 852 | #ifdef __USE_POSIX199506 |
ee188d55 | 853 | /* Return at most NAME_LEN characters of the login name of the user in NAME. |
6d52618b | 854 | If it cannot be determined or some other error occurred, return the error |
2c008571 UD |
855 | code. Otherwise return 0. |
856 | ||
4c1423ed | 857 | This function is a possible cancellation point and therefore not |
2c008571 | 858 | marked with __THROW. */ |
8a1f658b | 859 | extern int getlogin_r (char *__name, size_t __name_len) __nonnull ((1)); |
ee188d55 | 860 | #endif |
28f540f4 | 861 | |
498afc54 | 862 | #ifdef __USE_MISC |
28f540f4 | 863 | /* Set the login name returned by `getlogin'. */ |
a784e502 | 864 | extern int setlogin (const char *__name) __THROW __nonnull ((1)); |
28f540f4 RM |
865 | #endif |
866 | ||
867 | ||
868 | #ifdef __USE_POSIX2 | |
a379e56a UD |
869 | /* Get definitions and prototypes for functions to process the |
870 | arguments in ARGV (ARGC of them, minus the program name) for | |
871 | options given in OPTS. */ | |
10a33cf8 | 872 | # include <bits/getopt_posix.h> |
28f540f4 RM |
873 | #endif |
874 | ||
875 | ||
612fe432 | 876 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K |
28f540f4 RM |
877 | /* Put the name of the current host in no more than LEN bytes of NAME. |
878 | The result is null-terminated if LEN is large enough for the full | |
879 | name and the terminator. */ | |
8a1f658b | 880 | extern int gethostname (char *__name, size_t __len) __THROW __nonnull ((1)); |
639c3248 | 881 | #endif |
28f540f4 | 882 | |
639c3248 | 883 | |
266865c0 | 884 | #if defined __USE_MISC |
28f540f4 RM |
885 | /* Set the name of the current host to NAME, which is LEN bytes long. |
886 | This call is restricted to the super-user. */ | |
a784e502 | 887 | extern int sethostname (const char *__name, size_t __len) |
0476597b | 888 | __THROW __nonnull ((1)) __wur; |
28f540f4 | 889 | |
28f540f4 RM |
890 | /* Set the current machine's Internet number to ID. |
891 | This call is restricted to the super-user. */ | |
0476597b | 892 | extern int sethostid (long int __id) __THROW __wur; |
28f540f4 RM |
893 | |
894 | ||
f5348425 RM |
895 | /* Get and set the NIS (aka YP) domain name, if any. |
896 | Called just like `gethostname' and `sethostname'. | |
897 | The NIS domain name is usually the empty string when not using NIS. */ | |
8a1f658b | 898 | extern int getdomainname (char *__name, size_t __len) |
0476597b | 899 | __THROW __nonnull ((1)) __wur; |
a784e502 | 900 | extern int setdomainname (const char *__name, size_t __len) |
0476597b | 901 | __THROW __nonnull ((1)) __wur; |
f5348425 RM |
902 | |
903 | ||
28f540f4 RM |
904 | /* Revoke access permissions to all processes currently communicating |
905 | with the control terminal, and then send a SIGHUP signal to the process | |
906 | group of the control terminal. */ | |
c1422e5b | 907 | extern int vhangup (void) __THROW; |
28f540f4 | 908 | |
342414a6 | 909 | /* Revoke the access of all descriptors currently open on FILE. */ |
a784e502 | 910 | extern int revoke (const char *__file) __THROW __nonnull ((1)) __wur; |
342414a6 | 911 | |
28f540f4 | 912 | |
ea03559a RM |
913 | /* Enable statistical profiling, writing samples of the PC into at most |
914 | SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling | |
915 | is enabled, the system examines the user PC and increments | |
916 | SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero, | |
917 | disable profiling. Returns zero on success, -1 on error. */ | |
c1422e5b | 918 | extern int profil (unsigned short int *__sample_buffer, size_t __size, |
8a1f658b UD |
919 | size_t __offset, unsigned int __scale) |
920 | __THROW __nonnull ((1)); | |
ea03559a RM |
921 | |
922 | ||
28f540f4 RM |
923 | /* Turn accounting on if NAME is an existing file. The system will then write |
924 | a record for each process as it terminates, to this file. If NAME is NULL, | |
925 | turn accounting off. This call is restricted to the super-user. */ | |
a784e502 | 926 | extern int acct (const char *__name) __THROW; |
28f540f4 | 927 | |
28f540f4 RM |
928 | |
929 | /* Successive calls return the shells listed in `/etc/shells'. */ | |
c1422e5b UD |
930 | extern char *getusershell (void) __THROW; |
931 | extern void endusershell (void) __THROW; /* Discard cached info. */ | |
932 | extern void setusershell (void) __THROW; /* Rewind and re-read the file. */ | |
28f540f4 RM |
933 | |
934 | ||
28f540f4 RM |
935 | /* Put the program in the background, and dissociate from the controlling |
936 | terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero, | |
937 | redirects stdin, stdout, and stderr to /dev/null. */ | |
0476597b | 938 | extern int daemon (int __nochdir, int __noclose) __THROW __wur; |
266865c0 | 939 | #endif /* Use misc. */ |
28f540f4 RM |
940 | |
941 | ||
498afc54 | 942 | #if defined __USE_MISC || (defined __USE_XOPEN && !defined __USE_XOPEN2K) |
d921b304 UD |
943 | /* Make PATH be the root directory (the starting point for absolute paths). |
944 | This call is restricted to the super-user. */ | |
a784e502 | 945 | extern int chroot (const char *__path) __THROW __nonnull ((1)) __wur; |
d921b304 UD |
946 | |
947 | /* Prompt with PROMPT and read a string from the terminal without echoing. | |
948 | Uses /dev/tty if possible; otherwise stderr and stdin. */ | |
a784e502 | 949 | extern char *getpass (const char *__prompt) __nonnull ((1)); |
acd7f096 | 950 | #endif /* Use misc || X/Open. */ |
d921b304 UD |
951 | |
952 | ||
2c008571 UD |
953 | /* Make all changes done to FD actually appear on disk. |
954 | ||
955 | This function is a cancellation point and therefore not marked with | |
956 | __THROW. */ | |
957 | extern int fsync (int __fd); | |
d921b304 UD |
958 | |
959 | ||
81a5726b AS |
960 | #ifdef __USE_GNU |
961 | /* Make all changes done to all files on the file system associated | |
962 | with FD actually appear on disk. */ | |
963 | extern int syncfs (int __fd) __THROW; | |
964 | #endif | |
965 | ||
966 | ||
498afc54 | 967 | #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED |
2c6fe0bd | 968 | |
ce42435c UD |
969 | /* Return identifier for the current host. */ |
970 | extern long int gethostid (void); | |
28f540f4 | 971 | |
2c6fe0bd | 972 | /* Make all changes done to all files actually appear on disk. */ |
7287c36d | 973 | extern void sync (void) __THROW; |
28f540f4 | 974 | |
28f540f4 | 975 | |
498afc54 | 976 | # if defined __USE_MISC || !defined __USE_XOPEN2K |
2c6fe0bd UD |
977 | /* Return the number of bytes in a page. This is the system's page size, |
978 | which is not necessarily the same as the hardware page size. */ | |
16f282b8 | 979 | extern int getpagesize (void) __THROW __attribute__ ((__const__)); |
2c6fe0bd UD |
980 | |
981 | ||
f14038f2 UD |
982 | /* Return the maximum number of file descriptors |
983 | the current process could possibly have. */ | |
984 | extern int getdtablesize (void) __THROW; | |
52e2ea9a | 985 | # endif |
f14038f2 | 986 | |
acd7f096 | 987 | #endif /* Use misc || X/Open Unix. */ |
7cdb5a32 UD |
988 | |
989 | ||
acd7f096 | 990 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 |
f14038f2 | 991 | |
2c6fe0bd | 992 | /* Truncate FILE to LENGTH bytes. */ |
d921b304 | 993 | # ifndef __USE_FILE_OFFSET64 |
a784e502 | 994 | extern int truncate (const char *__file, __off_t __length) |
0476597b | 995 | __THROW __nonnull ((1)) __wur; |
d921b304 | 996 | # else |
f377d022 UD |
997 | # ifdef __REDIRECT_NTH |
998 | extern int __REDIRECT_NTH (truncate, | |
a784e502 | 999 | (const char *__file, __off64_t __length), |
0476597b | 1000 | truncate64) __nonnull ((1)) __wur; |
d921b304 UD |
1001 | # else |
1002 | # define truncate truncate64 | |
1003 | # endif | |
01cad722 | 1004 | # endif |
d921b304 | 1005 | # ifdef __USE_LARGEFILE64 |
a784e502 | 1006 | extern int truncate64 (const char *__file, __off64_t __length) |
0476597b | 1007 | __THROW __nonnull ((1)) __wur; |
d921b304 | 1008 | # endif |
2c6fe0bd | 1009 | |
acd7f096 | 1010 | #endif /* Use X/Open Unix || POSIX 2008. */ |
dda51327 | 1011 | |
acd7f096 | 1012 | #if defined __USE_POSIX199309 \ |
4efeffc1 | 1013 | || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K |
f14038f2 | 1014 | |
2c6fe0bd | 1015 | /* Truncate the file FD is open on to LENGTH bytes. */ |
d921b304 | 1016 | # ifndef __USE_FILE_OFFSET64 |
0476597b | 1017 | extern int ftruncate (int __fd, __off_t __length) __THROW __wur; |
d921b304 | 1018 | # else |
f377d022 UD |
1019 | # ifdef __REDIRECT_NTH |
1020 | extern int __REDIRECT_NTH (ftruncate, (int __fd, __off64_t __length), | |
0476597b | 1021 | ftruncate64) __wur; |
d921b304 UD |
1022 | # else |
1023 | # define ftruncate ftruncate64 | |
1024 | # endif | |
01cad722 | 1025 | # endif |
d921b304 | 1026 | # ifdef __USE_LARGEFILE64 |
0476597b | 1027 | extern int ftruncate64 (int __fd, __off64_t __length) __THROW __wur; |
d921b304 | 1028 | # endif |
2c6fe0bd | 1029 | |
acd7f096 | 1030 | #endif /* Use POSIX.1b || X/Open Unix || XPG6. */ |
2c6fe0bd UD |
1031 | |
1032 | ||
6a7007d7 UD |
1033 | #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K) \ |
1034 | || defined __USE_MISC | |
28f540f4 | 1035 | |
196980f5 RM |
1036 | /* Set the end of accessible data space (aka "the break") to ADDR. |
1037 | Returns zero on success and -1 for errors (with errno set). */ | |
0476597b | 1038 | extern int brk (void *__addr) __THROW __wur; |
196980f5 | 1039 | |
196980f5 RM |
1040 | /* Increase or decrease the end of accessible data space by DELTA bytes. |
1041 | If successful, returns the address the previous end of data space | |
1042 | (i.e. the beginning of the new space, if DELTA > 0); | |
1043 | returns (void *) -1 for errors (with errno set). */ | |
0ed99ce4 | 1044 | extern void *sbrk (intptr_t __delta) __THROW; |
2c6fe0bd | 1045 | #endif |
196980f5 RM |
1046 | |
1047 | ||
2c6fe0bd | 1048 | #ifdef __USE_MISC |
28f540f4 RM |
1049 | /* Invoke `system call' number SYSNO, passing it the remaining arguments. |
1050 | This is completely system-dependent, and not often useful. | |
1051 | ||
1052 | In Unix, `syscall' sets `errno' for all errors and most calls return -1 | |
1053 | for errors; in many systems you cannot pass arguments or get return | |
1054 | values for all system calls (`pipe', `fork', and `getppid' typically | |
1055 | among them). | |
1056 | ||
1057 | In Mach, all system calls take normal arguments and always return an | |
1058 | error code (zero for success). */ | |
c1422e5b | 1059 | extern long int syscall (long int __sysno, ...) __THROW; |
28f540f4 RM |
1060 | |
1061 | #endif /* Use misc. */ | |
1062 | ||
1063 | ||
0d8733c4 | 1064 | #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK |
28f540f4 RM |
1065 | /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both |
1066 | files consistent. Some systems have them there and some here, and some | |
1067 | software depends on the macros being defined without including both. */ | |
1068 | ||
1069 | /* `lockf' is a simpler interface to the locking facilities of `fcntl'. | |
1070 | LEN is always relative to the current file position. | |
2c008571 UD |
1071 | The CMD argument is one of the following. |
1072 | ||
1073 | This function is a cancellation point and therefore not marked with | |
1074 | __THROW. */ | |
28f540f4 | 1075 | |
a5a0310d UD |
1076 | # define F_ULOCK 0 /* Unlock a previously locked region. */ |
1077 | # define F_LOCK 1 /* Lock a region for exclusive use. */ | |
1078 | # define F_TLOCK 2 /* Test and lock a region for exclusive use. */ | |
1079 | # define F_TEST 3 /* Test a region for other processes locks. */ | |
28f540f4 | 1080 | |
dfd2257a | 1081 | # ifndef __USE_FILE_OFFSET64 |
0476597b | 1082 | extern int lockf (int __fd, int __cmd, __off_t __len) __wur; |
dfd2257a | 1083 | # else |
01cad722 | 1084 | # ifdef __REDIRECT |
2c008571 | 1085 | extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), |
0476597b | 1086 | lockf64) __wur; |
01cad722 UD |
1087 | # else |
1088 | # define lockf lockf64 | |
1089 | # endif | |
dfd2257a UD |
1090 | # endif |
1091 | # ifdef __USE_LARGEFILE64 | |
0476597b | 1092 | extern int lockf64 (int __fd, int __cmd, __off64_t __len) __wur; |
dfd2257a | 1093 | # endif |
28f540f4 RM |
1094 | #endif /* Use misc and F_LOCK not already defined. */ |
1095 | ||
1096 | ||
1097 | #ifdef __USE_GNU | |
1098 | ||
1099 | /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno' | |
1100 | set to EINTR. */ | |
1101 | ||
a5a0310d | 1102 | # define TEMP_FAILURE_RETRY(expression) \ |
036cc82f RM |
1103 | (__extension__ \ |
1104 | ({ long int __result; \ | |
28f540f4 RM |
1105 | do __result = (long int) (expression); \ |
1106 | while (__result == -1L && errno == EINTR); \ | |
06535ae9 | 1107 | __result; })) |
28f540f4 RM |
1108 | #endif |
1109 | ||
a5a0310d | 1110 | #if defined __USE_POSIX199309 || defined __USE_UNIX98 |
7b3547eb RM |
1111 | /* Synchronize at least the data part of a file with the underlying |
1112 | media. */ | |
aa75f64c | 1113 | extern int fdatasync (int __fildes); |
6d52618b | 1114 | #endif /* Use POSIX199309 */ |
7b3547eb | 1115 | |
2c6fe0bd UD |
1116 | |
1117 | /* XPG4.2 specifies that prototypes for the encryption functions must | |
1118 | be defined here. */ | |
1119 | #ifdef __USE_XOPEN | |
1120 | /* Encrypt at most 8 characters from KEY using salt to perturb DES. */ | |
a784e502 | 1121 | extern char *crypt (const char *__key, const char *__salt) |
8a1f658b | 1122 | __THROW __nonnull ((1, 2)); |
2c6fe0bd | 1123 | |
2c6fe0bd UD |
1124 | /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt |
1125 | block in place. */ | |
84ae135d MI |
1126 | extern void encrypt (char *__glibc_block, int __edflag) |
1127 | __THROW __nonnull ((1)); | |
2c6fe0bd UD |
1128 | |
1129 | ||
1130 | /* Swab pairs bytes in the first N bytes of the area pointed to by | |
1131 | FROM and copy the result to TO. The value of TO must not be in the | |
1132 | range [FROM - N + 1, FROM - 1]. If N is odd the first byte in FROM | |
1133 | is without partner. */ | |
a784e502 | 1134 | extern void swab (const void *__restrict __from, void *__restrict __to, |
8a1f658b | 1135 | ssize_t __n) __THROW __nonnull ((1, 2)); |
a5a0310d UD |
1136 | #endif |
1137 | ||
1138 | ||
b9eca49e JM |
1139 | /* Prior to Issue 6, the Single Unix Specification required these |
1140 | prototypes to appear in this header. They are also found in | |
1141 | <stdio.h>. */ | |
d94a4670 | 1142 | #if defined __USE_XOPEN && !defined __USE_XOPEN2K |
a5a0310d | 1143 | /* Return the name of the controlling terminal. */ |
35c2fd59 | 1144 | extern char *ctermid (char *__s) __THROW; |
b9eca49e JM |
1145 | |
1146 | /* Return the name of the current user. */ | |
1147 | extern char *cuserid (char *__s); | |
e918a7fe UD |
1148 | #endif |
1149 | ||
553cc5f9 | 1150 | |
46c1ffa4 JM |
1151 | /* Unix98 requires this function to be declared here. In other |
1152 | standards it is in <pthread.h>. */ | |
1153 | #if defined __USE_UNIX98 && !defined __USE_XOPEN2K | |
1154 | extern int pthread_atfork (void (*__prepare) (void), | |
1155 | void (*__parent) (void), | |
1156 | void (*__child) (void)) __THROW; | |
1157 | #endif | |
1158 | ||
a851999f | 1159 | #ifdef __USE_MISC |
ccb8b7f7 FW |
1160 | /* Write LENGTH bytes of randomness starting at BUFFER. Return 0 on |
1161 | success or -1 on error. */ | |
1162 | int getentropy (void *__buffer, size_t __length) __wur; | |
1163 | #endif | |
46c1ffa4 | 1164 | |
f2b0dc44 | 1165 | /* Define some macros helping to catch buffer overflows. */ |
5ac3ea17 | 1166 | #if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function |
f2b0dc44 UD |
1167 | # include <bits/unistd.h> |
1168 | #endif | |
1169 | ||
28f540f4 RM |
1170 | __END_DECLS |
1171 | ||
1172 | #endif /* unistd.h */ |