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b1a66442 | 1 | /* Copyright (C) 1991-2009, 2010 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 AJ |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, write to the Free | |
16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
17 | 02111-1307 USA. */ | |
28f540f4 RM |
18 | |
19 | /* | |
20 | * POSIX Standard: 2.10 Symbolic Constants <unistd.h> | |
21 | */ | |
22 | ||
23 | #ifndef _UNISTD_H | |
28f540f4 | 24 | #define _UNISTD_H 1 |
5107cf1d | 25 | |
28f540f4 RM |
26 | #include <features.h> |
27 | ||
28 | __BEGIN_DECLS | |
29 | ||
30 | /* These may be used to determine what facilities are present at compile time. | |
2c6fe0bd | 31 | Their values can be obtained at run time from `sysconf'. */ |
28f540f4 | 32 | |
c6b6723e | 33 | #ifdef __USE_XOPEN2K8 |
7db0cc42 | 34 | /* POSIX Standard approved as ISO/IEC 9945-1 as of September 2008. */ |
c6b6723e UD |
35 | # define _POSIX_VERSION 200809L |
36 | #elif defined __USE_XOPEN2K | |
37 | /* POSIX Standard approved as ISO/IEC 9945-1 as of December 2001. */ | |
38 | # define _POSIX_VERSION 200112L | |
39 | #elif defined __USE_POSIX199506 | |
40 | /* POSIX Standard approved as ISO/IEC 9945-1 as of June 1995. */ | |
41 | # define _POSIX_VERSION 199506L | |
42 | #elif defined __USE_POSIX199309 | |
43 | /* POSIX Standard approved as ISO/IEC 9945-1 as of September 1993. */ | |
44 | # define _POSIX_VERSION 199309L | |
45 | #else | |
46 | /* POSIX Standard approved as ISO/IEC 9945-1 as of September 1990. */ | |
47 | # define _POSIX_VERSION 199009L | |
48 | #endif | |
28f540f4 RM |
49 | |
50 | /* These are not #ifdef __USE_POSIX2 because they are | |
51 | in the theoretically application-owned namespace. */ | |
52 | ||
bdc7f5d7 UD |
53 | #ifdef __USE_XOPEN2K8 |
54 | # define __POSIX2_THIS_VERSION 200809L | |
55 | /* The utilities on GNU systems also correspond to this version. */ | |
56 | #elif defined __USE_XOPEN2K | |
57 | /* The utilities on GNU systems also correspond to this version. */ | |
58 | # define __POSIX2_THIS_VERSION 200112L | |
59 | #elif defined __USE_POSIX199506 | |
60 | /* The utilities on GNU systems also correspond to this version. */ | |
61 | # define __POSIX2_THIS_VERSION 199506L | |
62 | #else | |
63 | /* The utilities on GNU systems also correspond to this version. */ | |
64 | # define __POSIX2_THIS_VERSION 199209L | |
65 | #endif | |
66 | ||
9756dfe1 | 67 | /* The utilities on GNU systems also correspond to this version. */ |
bdc7f5d7 | 68 | #define _POSIX2_VERSION __POSIX2_THIS_VERSION |
9756dfe1 | 69 | |
28f540f4 RM |
70 | /* If defined, the implementation supports the |
71 | C Language Bindings Option. */ | |
bdc7f5d7 | 72 | #define _POSIX2_C_BIND __POSIX2_THIS_VERSION |
28f540f4 RM |
73 | |
74 | /* If defined, the implementation supports the | |
75 | C Language Development Utilities Option. */ | |
bdc7f5d7 | 76 | #define _POSIX2_C_DEV __POSIX2_THIS_VERSION |
28f540f4 RM |
77 | |
78 | /* If defined, the implementation supports the | |
79 | Software Development Utilities Option. */ | |
bdc7f5d7 | 80 | #define _POSIX2_SW_DEV __POSIX2_THIS_VERSION |
28f540f4 | 81 | |
19bc17a9 RM |
82 | /* If defined, the implementation supports the |
83 | creation of locales with the localedef utility. */ | |
bdc7f5d7 | 84 | #define _POSIX2_LOCALEDEF __POSIX2_THIS_VERSION |
19bc17a9 | 85 | |
9756dfe1 | 86 | /* X/Open version number to which the library conforms. It is selectable. */ |
7db0cc42 UD |
87 | #ifdef __USE_XOPEN2K8 |
88 | # define _XOPEN_VERSION 700 | |
89 | #elif defined __USE_XOPEN2K | |
faf3ad69 UD |
90 | # define _XOPEN_VERSION 600 |
91 | #elif defined __USE_UNIX98 | |
9756dfe1 UD |
92 | # define _XOPEN_VERSION 500 |
93 | #else | |
94 | # define _XOPEN_VERSION 4 | |
95 | #endif | |
845dcb57 | 96 | |
2c6fe0bd UD |
97 | /* Commands and utilities from XPG4 are available. */ |
98 | #define _XOPEN_XCU_VERSION 4 | |
99 | ||
100 | /* We are compatible with the old published standards as well. */ | |
101 | #define _XOPEN_XPG2 1 | |
102 | #define _XOPEN_XPG3 1 | |
103 | #define _XOPEN_XPG4 1 | |
104 | ||
105 | /* The X/Open Unix extensions are available. */ | |
106 | #define _XOPEN_UNIX 1 | |
107 | ||
108 | /* Encryption is present. */ | |
109 | #define _XOPEN_CRYPT 1 | |
110 | ||
afd4eb37 | 111 | /* The enhanced internationalization capabilities according to XPG4.2 |
2c6fe0bd UD |
112 | are present. */ |
113 | #define _XOPEN_ENH_I18N 1 | |
114 | ||
cbdee279 UD |
115 | /* The legacy interfaces are also available. */ |
116 | #define _XOPEN_LEGACY 1 | |
117 | ||
28f540f4 RM |
118 | |
119 | /* Get values of POSIX options: | |
120 | ||
121 | If these symbols are defined, the corresponding features are | |
122 | always available. If not, they may be available sometimes. | |
123 | The current values can be obtained with `sysconf'. | |
124 | ||
7b3547eb RM |
125 | _POSIX_JOB_CONTROL Job control is supported. |
126 | _POSIX_SAVED_IDS Processes have a saved set-user-ID | |
6991feeb | 127 | and a saved set-group-ID. |
7b3547eb RM |
128 | _POSIX_REALTIME_SIGNALS Real-time, queued signals are supported. |
129 | _POSIX_PRIORITY_SCHEDULING Priority scheduling is supported. | |
130 | _POSIX_TIMERS POSIX.4 clocks and timers are supported. | |
131 | _POSIX_ASYNCHRONOUS_IO Asynchronous I/O is supported. | |
132 | _POSIX_PRIORITIZED_IO Prioritized asynchronous I/O is supported. | |
133 | _POSIX_SYNCHRONIZED_IO Synchronizing file data is supported. | |
134 | _POSIX_FSYNC The fsync function is present. | |
135 | _POSIX_MAPPED_FILES Mapping of files to memory is supported. | |
136 | _POSIX_MEMLOCK Locking of all memory is supported. | |
137 | _POSIX_MEMLOCK_RANGE Locking of ranges of memory is supported. | |
138 | _POSIX_MEMORY_PROTECTION Setting of memory protections is supported. | |
139 | _POSIX_MESSAGE_PASSING POSIX.4 message queues are supported. | |
140 | _POSIX_SEMAPHORES POSIX.4 counting semaphores are supported. | |
141 | _POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported. | |
af6f3906 UD |
142 | _POSIX_THREADS POSIX.1c pthreads are supported. |
143 | _POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported. | |
144 | _POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported. | |
145 | _POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported. | |
146 | _POSIX_THREAD_PRIORITY_SCHEDULING | |
147 | POSIX.1c thread execution scheduling supported. | |
148 | _POSIX_THREAD_PRIO_INHERIT Thread priority inheritance option supported. | |
149 | _POSIX_THREAD_PRIO_PROTECT Thread priority protection option supported. | |
150 | _POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported. | |
503054c0 RM |
151 | _POSIX_PII Protocol-independent interfaces are supported. |
152 | _POSIX_PII_XTI XTI protocol-indep. interfaces are supported. | |
153 | _POSIX_PII_SOCKET Socket protocol-indep. interfaces are supported. | |
154 | _POSIX_PII_INTERNET Internet family of protocols supported. | |
155 | _POSIX_PII_INTERNET_STREAM Connection-mode Internet protocol supported. | |
156 | _POSIX_PII_INTERNET_DGRAM Connectionless Internet protocol supported. | |
157 | _POSIX_PII_OSI ISO/OSI family of protocols supported. | |
158 | _POSIX_PII_OSI_COTS Connection-mode ISO/OSI service supported. | |
159 | _POSIX_PII_OSI_CLTS Connectionless ISO/OSI service supported. | |
160 | _POSIX_POLL Implementation supports `poll' function. | |
161 | _POSIX_SELECT Implementation supports `select' and `pselect'. | |
28f540f4 | 162 | |
cbdee279 UD |
163 | _XOPEN_REALTIME X/Open realtime support is available. |
164 | _XOPEN_REALTIME_THREADS X/Open realtime thread support is available. | |
2c6fe0bd UD |
165 | _XOPEN_SHM Shared memory interface according to XPG4.2. |
166 | ||
86187531 UD |
167 | _XBS5_ILP32_OFF32 Implementation provides environment with 32-bit |
168 | int, long, pointer, and off_t types. | |
169 | _XBS5_ILP32_OFFBIG Implementation provides environment with 32-bit | |
170 | int, long, and pointer and off_t with at least | |
171 | 64 bits. | |
172 | _XBS5_LP64_OFF64 Implementation provides environment with 32-bit | |
173 | int, and 64-bit long, pointer, and off_t types. | |
174 | _XBS5_LPBIG_OFFBIG Implementation provides environment with at | |
175 | least 32 bits int and long, pointer, and off_t | |
176 | with at least 64 bits. | |
177 | ||
28f540f4 RM |
178 | If any of these symbols is defined as -1, the corresponding option is not |
179 | true for any file. If any is defined as other than -1, the corresponding | |
180 | option is true for all files. If a symbol is not defined at all, the value | |
181 | for a specific file can be obtained from `pathconf' and `fpathconf'. | |
182 | ||
183 | _POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change | |
6991feeb | 184 | the owner of a file. `chown' can only be used |
28f540f4 RM |
185 | to change the group ID of a file to a group of |
186 | which the calling process is a member. | |
187 | _POSIX_NO_TRUNC Pathname components longer than | |
6991feeb | 188 | NAME_MAX generate an error. |
28f540f4 RM |
189 | _POSIX_VDISABLE If defined, if the value of an element of the |
190 | `c_cc' member of `struct termios' is | |
191 | _POSIX_VDISABLE, no character will have the | |
192 | effect associated with that element. | |
75cd5204 RM |
193 | _POSIX_SYNC_IO Synchronous I/O may be performed. |
194 | _POSIX_ASYNC_IO Asynchronous I/O may be performed. | |
195 | _POSIX_PRIO_IO Prioritized Asynchronous I/O may be performed. | |
dfd2257a UD |
196 | |
197 | Support for the Large File Support interface is not generally available. | |
198 | If it is available the following constants are defined to one. | |
199 | _LFS64_LARGEFILE Low-level I/O supports large files. | |
200 | _LFS64_STDIO Standard I/O supports large files. | |
28f540f4 RM |
201 | */ |
202 | ||
5107cf1d | 203 | #include <bits/posix_opt.h> |
28f540f4 | 204 | |
cbdee279 | 205 | /* Get the environment definitions from Unix98. */ |
7cdb5a32 | 206 | #if defined __USE_UNIX98 || defined __USE_XOPEN2K |
cbdee279 UD |
207 | # include <bits/environments.h> |
208 | #endif | |
28f540f4 RM |
209 | |
210 | /* Standard file descriptors. */ | |
211 | #define STDIN_FILENO 0 /* Standard input. */ | |
212 | #define STDOUT_FILENO 1 /* Standard output. */ | |
213 | #define STDERR_FILENO 2 /* Standard error output. */ | |
214 | ||
215 | ||
216 | /* All functions that are not declared anywhere else. */ | |
217 | ||
5107cf1d | 218 | #include <bits/types.h> |
28f540f4 | 219 | |
7df789e0 | 220 | #ifndef __ssize_t_defined |
a68b0d31 | 221 | typedef __ssize_t ssize_t; |
7df789e0 | 222 | # define __ssize_t_defined |
28f540f4 RM |
223 | #endif |
224 | ||
225 | #define __need_size_t | |
226 | #define __need_NULL | |
227 | #include <stddef.h> | |
228 | ||
7a80496f | 229 | #if defined __USE_XOPEN || defined __USE_XOPEN2K |
a5a0310d UD |
230 | /* The Single Unix specification says that some more types are |
231 | available here. */ | |
7df789e0 | 232 | # ifndef __gid_t_defined |
a5a0310d | 233 | typedef __gid_t gid_t; |
7df789e0 | 234 | # define __gid_t_defined |
a5a0310d UD |
235 | # endif |
236 | ||
7df789e0 | 237 | # ifndef __uid_t_defined |
a5a0310d | 238 | typedef __uid_t uid_t; |
7df789e0 | 239 | # define __uid_t_defined |
a5a0310d UD |
240 | # endif |
241 | ||
7df789e0 | 242 | # ifndef __off_t_defined |
dfd2257a | 243 | # ifndef __USE_FILE_OFFSET64 |
a5a0310d | 244 | typedef __off_t off_t; |
dfd2257a UD |
245 | # else |
246 | typedef __off64_t off_t; | |
247 | # endif | |
7df789e0 | 248 | # define __off_t_defined |
a5a0310d | 249 | # endif |
7df789e0 | 250 | # if defined __USE_LARGEFILE64 && !defined __off64_t_defined |
dfd2257a | 251 | typedef __off64_t off64_t; |
7df789e0 | 252 | # define __off64_t_defined |
dfd2257a | 253 | # endif |
a5a0310d | 254 | |
7707af89 UD |
255 | # ifndef __useconds_t_defined |
256 | typedef __useconds_t useconds_t; | |
257 | # define __useconds_t_defined | |
258 | # endif | |
259 | ||
7df789e0 | 260 | # ifndef __pid_t_defined |
a5a0310d | 261 | typedef __pid_t pid_t; |
7df789e0 | 262 | # define __pid_t_defined |
a5a0310d | 263 | # endif |
e918a7fe | 264 | #endif /* X/Open */ |
4bae5567 | 265 | |
7cdb5a32 | 266 | #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K |
7df789e0 | 267 | # ifndef __intptr_t_defined |
4bae5567 | 268 | typedef __intptr_t intptr_t; |
7df789e0 | 269 | # define __intptr_t_defined |
4bae5567 | 270 | # endif |
4c63ebaa | 271 | #endif |
28f540f4 | 272 | |
750f9af6 UD |
273 | #if defined __USE_BSD || defined __USE_XOPEN |
274 | # ifndef __socklen_t_defined | |
275 | typedef __socklen_t socklen_t; | |
276 | # define __socklen_t_defined | |
277 | # endif | |
278 | #endif | |
279 | ||
28f540f4 RM |
280 | /* Values for the second argument to access. |
281 | These may be OR'd together. */ | |
282 | #define R_OK 4 /* Test for read permission. */ | |
283 | #define W_OK 2 /* Test for write permission. */ | |
284 | #define X_OK 1 /* Test for execute permission. */ | |
285 | #define F_OK 0 /* Test for existence. */ | |
286 | ||
22a1292a | 287 | /* Test for access to NAME using the real UID and real GID. */ |
8a1f658b | 288 | extern int access (__const char *__name, int __type) __THROW __nonnull ((1)); |
28f540f4 | 289 | |
22a1292a RM |
290 | #ifdef __USE_GNU |
291 | /* Test for access to NAME using the effective UID and GID | |
292 | (as normal file operations use). */ | |
8a1f658b UD |
293 | extern int euidaccess (__const char *__name, int __type) |
294 | __THROW __nonnull ((1)); | |
cb483e04 RM |
295 | |
296 | /* An alias for `euidaccess', used by some other systems. */ | |
297 | extern int eaccess (__const char *__name, int __type) | |
298 | __THROW __nonnull ((1)); | |
22a1292a RM |
299 | #endif |
300 | ||
d15b99ac RM |
301 | #ifdef __USE_ATFILE |
302 | /* Test for access to FILE relative to the directory FD is open on. | |
303 | If AT_EACCESS is set in FLAG, then use effective IDs like `eaccess', | |
304 | otherwise use real IDs like `access'. */ | |
305 | extern int faccessat (int __fd, __const char *__file, int __type, int __flag) | |
306 | __THROW __nonnull ((2)) __wur; | |
307 | #endif /* Use GNU. */ | |
308 | ||
28f540f4 RM |
309 | |
310 | /* Values for the WHENCE argument to lseek. */ | |
311 | #ifndef _STDIO_H /* <stdio.h> has the same definitions. */ | |
a5a0310d UD |
312 | # define SEEK_SET 0 /* Seek from beginning of file. */ |
313 | # define SEEK_CUR 1 /* Seek from current position. */ | |
314 | # define SEEK_END 2 /* Seek from end of file. */ | |
28f540f4 RM |
315 | #endif |
316 | ||
0d8733c4 | 317 | #if defined __USE_BSD && !defined L_SET |
1474b80f | 318 | /* Old BSD names for the same constants; just for compatibility. */ |
a5a0310d UD |
319 | # define L_SET SEEK_SET |
320 | # define L_INCR SEEK_CUR | |
321 | # define L_XTND SEEK_END | |
1474b80f RM |
322 | #endif |
323 | ||
324 | ||
28f540f4 RM |
325 | /* Move FD's file position to OFFSET bytes from the |
326 | beginning of the file (if WHENCE is SEEK_SET), | |
327 | the current position (if WHENCE is SEEK_CUR), | |
328 | or the end of the file (if WHENCE is SEEK_END). | |
329 | Return the new file position. */ | |
dfd2257a | 330 | #ifndef __USE_FILE_OFFSET64 |
c1422e5b | 331 | extern __off_t lseek (int __fd, __off_t __offset, int __whence) __THROW; |
dfd2257a | 332 | #else |
f377d022 UD |
333 | # ifdef __REDIRECT_NTH |
334 | extern __off64_t __REDIRECT_NTH (lseek, | |
335 | (int __fd, __off64_t __offset, int __whence), | |
336 | lseek64); | |
01cad722 UD |
337 | # else |
338 | # define lseek lseek64 | |
339 | # endif | |
dfd2257a UD |
340 | #endif |
341 | #ifdef __USE_LARGEFILE64 | |
0476597b UD |
342 | extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence) |
343 | __THROW; | |
dfd2257a | 344 | #endif |
28f540f4 | 345 | |
2c008571 UD |
346 | /* Close the file descriptor FD. |
347 | ||
348 | This function is a cancellation point and therefore not marked with | |
349 | __THROW. */ | |
350 | extern int close (int __fd); | |
28f540f4 RM |
351 | |
352 | /* Read NBYTES into BUF from FD. Return the | |
2c008571 UD |
353 | number read, -1 for errors or 0 for EOF. |
354 | ||
355 | This function is a cancellation point and therefore not marked with | |
356 | __THROW. */ | |
0476597b | 357 | extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur; |
2c008571 UD |
358 | |
359 | /* Write N bytes of BUF to FD. Return the number written, or -1. | |
28f540f4 | 360 | |
2c008571 UD |
361 | This function is a cancellation point and therefore not marked with |
362 | __THROW. */ | |
0476597b | 363 | extern ssize_t write (int __fd, __const void *__buf, size_t __n) __wur; |
28f540f4 | 364 | |
7cdb5a32 | 365 | #if defined __USE_UNIX98 || defined __USE_XOPEN2K8 |
dfd2257a | 366 | # ifndef __USE_FILE_OFFSET64 |
2c008571 UD |
367 | /* Read NBYTES into BUF from FD at the given position OFFSET without |
368 | changing the file pointer. Return the number read, -1 for errors | |
369 | or 0 for EOF. | |
370 | ||
371 | This function is a cancellation point and therefore not marked with | |
372 | __THROW. */ | |
373 | extern ssize_t pread (int __fd, void *__buf, size_t __nbytes, | |
0476597b | 374 | __off_t __offset) __wur; |
2c008571 UD |
375 | |
376 | /* Write N bytes of BUF to FD at the given position OFFSET without | |
377 | changing the file pointer. Return the number written, or -1. | |
378 | ||
379 | This function is a cancellation point and therefore not marked with | |
380 | __THROW. */ | |
c1422e5b | 381 | extern ssize_t pwrite (int __fd, __const void *__buf, size_t __n, |
0476597b | 382 | __off_t __offset) __wur; |
dfd2257a | 383 | # else |
01cad722 | 384 | # ifdef __REDIRECT |
c1422e5b | 385 | extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes, |
2c008571 | 386 | __off64_t __offset), |
0476597b | 387 | pread64) __wur; |
c1422e5b | 388 | extern ssize_t __REDIRECT (pwrite, (int __fd, __const void *__buf, |
2c008571 | 389 | size_t __nbytes, __off64_t __offset), |
0476597b | 390 | pwrite64) __wur; |
01cad722 UD |
391 | # else |
392 | # define pread pread64 | |
393 | # define pwrite pwrite64 | |
394 | # endif | |
dfd2257a | 395 | # endif |
01cad722 | 396 | |
dfd2257a | 397 | # ifdef __USE_LARGEFILE64 |
6991feeb AJ |
398 | /* Read NBYTES into BUF from FD at the given position OFFSET without |
399 | changing the file pointer. Return the number read, -1 for errors | |
400 | or 0 for EOF. */ | |
c1422e5b | 401 | extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes, |
0476597b | 402 | __off64_t __offset) __wur; |
6991feeb AJ |
403 | /* Write N bytes of BUF to FD at the given position OFFSET without |
404 | changing the file pointer. Return the number written, or -1. */ | |
c1422e5b | 405 | extern ssize_t pwrite64 (int __fd, __const void *__buf, size_t __n, |
0476597b | 406 | __off64_t __offset) __wur; |
dfd2257a | 407 | # endif |
a5a0310d UD |
408 | #endif |
409 | ||
28f540f4 | 410 | /* Create a one-way communication channel (pipe). |
6d52618b | 411 | If successful, two file descriptors are stored in PIPEDES; |
28f540f4 RM |
412 | bytes written on PIPEDES[1] can be read from PIPEDES[0]. |
413 | Returns 0 if successful, -1 if not. */ | |
0476597b | 414 | extern int pipe (int __pipedes[2]) __THROW __wur; |
28f540f4 | 415 | |
bdcebfc4 UD |
416 | #ifdef __USE_GNU |
417 | /* Same as pipe but apply flags passed in FLAGS to the new file | |
418 | descriptors. */ | |
419 | extern int pipe2 (int __pipedes[2], int __flags) __THROW __wur; | |
420 | #endif | |
421 | ||
28f540f4 RM |
422 | /* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM. |
423 | If SECONDS is zero, any currently scheduled alarm will be cancelled. | |
424 | The function returns the number of seconds remaining until the last | |
425 | alarm scheduled would have signaled, or zero if there wasn't one. | |
426 | There is no return value to indicate an error, but you can set `errno' | |
427 | to 0 and check its value after calling `alarm', and this might tell you. | |
428 | The signal may come late due to processor scheduling. */ | |
c1422e5b | 429 | extern unsigned int alarm (unsigned int __seconds) __THROW; |
28f540f4 RM |
430 | |
431 | /* Make the process sleep for SECONDS seconds, or until a signal arrives | |
432 | and is not ignored. The function returns the number of seconds less | |
433 | than SECONDS which it actually slept (thus zero if it slept the full time). | |
434 | If a signal handler does a `longjmp' or modifies the handling of the | |
435 | SIGALRM signal while inside `sleep' call, the handling of the SIGALRM | |
436 | signal afterwards is undefined. There is no return value to indicate | |
2c008571 UD |
437 | error, but if `sleep' returns SECONDS, it probably didn't work. |
438 | ||
439 | This function is a cancellation point and therefore not marked with | |
440 | __THROW. */ | |
441 | extern unsigned int sleep (unsigned int __seconds); | |
28f540f4 | 442 | |
21487cc9 UD |
443 | #if ((defined __USE_BSD || defined __USE_XOPEN_EXTENDED) \ |
444 | && !defined __USE_XOPEN2K8) || defined __USE_GNU | |
2c6fe0bd UD |
445 | /* Set an alarm to go off (generating a SIGALRM signal) in VALUE |
446 | microseconds. If INTERVAL is nonzero, when the alarm goes off, the | |
447 | timer is reset to go off every INTERVAL microseconds thereafter. | |
448 | Returns the number of microseconds remaining before the alarm. */ | |
c1422e5b UD |
449 | extern __useconds_t ualarm (__useconds_t __value, __useconds_t __interval) |
450 | __THROW; | |
2c6fe0bd | 451 | |
52e9a9d1 | 452 | /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked |
2c008571 UD |
453 | or ignored. |
454 | ||
455 | This function is a cancellation point and therefore not marked with | |
456 | __THROW. */ | |
457 | extern int usleep (__useconds_t __useconds); | |
52e9a9d1 RM |
458 | #endif |
459 | ||
28f540f4 RM |
460 | |
461 | /* Suspend the process until a signal arrives. | |
2c008571 UD |
462 | This always returns -1 and sets `errno' to EINTR. |
463 | ||
464 | This function is a cancellation point and therefore not marked with | |
465 | __THROW. */ | |
466 | extern int pause (void); | |
28f540f4 RM |
467 | |
468 | ||
469 | /* Change the owner and group of FILE. */ | |
c1422e5b | 470 | extern int chown (__const char *__file, __uid_t __owner, __gid_t __group) |
0476597b | 471 | __THROW __nonnull ((1)) __wur; |
28f540f4 | 472 | |
7cdb5a32 | 473 | #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 |
28f540f4 | 474 | /* Change the owner and group of the file that FD is open on. */ |
0476597b | 475 | extern int fchown (int __fd, __uid_t __owner, __gid_t __group) __THROW __wur; |
2c6fe0bd UD |
476 | |
477 | ||
478 | /* Change owner and group of FILE, if it is a symbolic | |
479 | link the ownership of the symbolic link is changed. */ | |
c1422e5b | 480 | extern int lchown (__const char *__file, __uid_t __owner, __gid_t __group) |
0476597b | 481 | __THROW __nonnull ((1)) __wur; |
2c6fe0bd UD |
482 | |
483 | #endif /* Use BSD || X/Open Unix. */ | |
28f540f4 | 484 | |
0b8f25bb | 485 | #ifdef __USE_ATFILE |
26cec518 UD |
486 | /* Change the owner and group of FILE relative to the directory FD is open |
487 | on. */ | |
488 | extern int fchownat (int __fd, __const char *__file, __uid_t __owner, | |
489 | __gid_t __group, int __flag) | |
490 | __THROW __nonnull ((2)) __wur; | |
491 | #endif /* Use GNU. */ | |
492 | ||
28f540f4 | 493 | /* Change the process's working directory to PATH. */ |
0476597b | 494 | extern int chdir (__const char *__path) __THROW __nonnull ((1)) __wur; |
28f540f4 | 495 | |
7cdb5a32 | 496 | #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 |
28f540f4 | 497 | /* Change the process's working directory to the one FD is open on. */ |
0476597b | 498 | extern int fchdir (int __fd) __THROW __wur; |
28f540f4 RM |
499 | #endif |
500 | ||
501 | /* Get the pathname of the current working directory, | |
502 | and put it in SIZE bytes of BUF. Returns NULL if the | |
503 | directory couldn't be determined or SIZE was too small. | |
504 | If successful, returns BUF. In GNU, if BUF is NULL, | |
505 | an array is allocated with `malloc'; the array is SIZE | |
714a562f | 506 | bytes long, unless SIZE == 0, in which case it is as |
28f540f4 | 507 | big as necessary. */ |
0476597b | 508 | extern char *getcwd (char *__buf, size_t __size) __THROW __wur; |
28f540f4 RM |
509 | |
510 | #ifdef __USE_GNU | |
511 | /* Return a malloc'd string containing the current directory name. | |
512 | If the environment variable `PWD' is set, and its value is correct, | |
513 | that value is used. */ | |
c1422e5b | 514 | extern char *get_current_dir_name (void) __THROW; |
28f540f4 RM |
515 | #endif |
516 | ||
21487cc9 UD |
517 | #if ((defined __USE_BSD || defined __USE_XOPEN_EXTENDED) \ |
518 | && !defined __USE_XOPEN2K8) || defined __USE_GNU | |
28f540f4 RM |
519 | /* Put the absolute pathname of the current working directory in BUF. |
520 | If successful, return BUF. If not, put an error message in | |
521 | BUF and return NULL. BUF should be at least PATH_MAX bytes long. */ | |
0476597b UD |
522 | extern char *getwd (char *__buf) |
523 | __THROW __nonnull ((1)) __attribute_deprecated__ __wur; | |
28f540f4 RM |
524 | #endif |
525 | ||
526 | ||
527 | /* Duplicate FD, returning a new file descriptor on the same file. */ | |
0476597b | 528 | extern int dup (int __fd) __THROW __wur; |
28f540f4 RM |
529 | |
530 | /* Duplicate FD to FD2, closing FD2 and making it open on the same file. */ | |
e2070ca2 | 531 | extern int dup2 (int __fd, int __fd2) __THROW; |
28f540f4 | 532 | |
bdcebfc4 UD |
533 | #ifdef __USE_GNU |
534 | /* Duplicate FD to FD2, closing FD2 and making it open on the same | |
535 | file while setting flags according to FLAGS. */ | |
536 | extern int dup3 (int __fd, int __fd2, int __flags) __THROW; | |
537 | #endif | |
538 | ||
28f540f4 RM |
539 | /* NULL-terminated array of "NAME=VALUE" environment variables. */ |
540 | extern char **__environ; | |
df4ef2ab UD |
541 | #ifdef __USE_GNU |
542 | extern char **environ; | |
543 | #endif | |
28f540f4 RM |
544 | |
545 | ||
546 | /* Replace the current process, executing PATH with arguments ARGV and | |
547 | environment ENVP. ARGV and ENVP are terminated by NULL pointers. */ | |
c1422e5b | 548 | extern int execve (__const char *__path, char *__const __argv[], |
4940d71b | 549 | char *__const __envp[]) __THROW __nonnull ((1, 2)); |
28f540f4 | 550 | |
6cbe890a | 551 | #ifdef __USE_XOPEN2K8 |
28f540f4 RM |
552 | /* Execute the file FD refers to, overlaying the running program image. |
553 | ARGV and ENVP are passed to the new program, as for `execve'. */ | |
c1422e5b | 554 | extern int fexecve (int __fd, char *__const __argv[], char *__const __envp[]) |
4940d71b | 555 | __THROW __nonnull ((2)); |
28f540f4 RM |
556 | #endif |
557 | ||
558 | ||
559 | /* Execute PATH with arguments ARGV and environment from `environ'. */ | |
8a1f658b | 560 | extern int execv (__const char *__path, char *__const __argv[]) |
4940d71b | 561 | __THROW __nonnull ((1, 2)); |
28f540f4 RM |
562 | |
563 | /* Execute PATH with all arguments after PATH until a NULL pointer, | |
564 | and the argument after that for environment. */ | |
8a1f658b | 565 | extern int execle (__const char *__path, __const char *__arg, ...) |
4940d71b | 566 | __THROW __nonnull ((1, 2)); |
28f540f4 RM |
567 | |
568 | /* Execute PATH with all arguments after PATH until | |
569 | a NULL pointer and environment from `environ'. */ | |
8a1f658b | 570 | extern int execl (__const char *__path, __const char *__arg, ...) |
4940d71b | 571 | __THROW __nonnull ((1, 2)); |
28f540f4 RM |
572 | |
573 | /* Execute FILE, searching in the `PATH' environment variable if it contains | |
574 | no slashes, with arguments ARGV and environment from `environ'. */ | |
8a1f658b | 575 | extern int execvp (__const char *__file, char *__const __argv[]) |
4940d71b | 576 | __THROW __nonnull ((1, 2)); |
28f540f4 RM |
577 | |
578 | /* Execute FILE, searching in the `PATH' environment variable if | |
579 | it contains no slashes, with all arguments after FILE until a | |
580 | NULL pointer and environment from `environ'. */ | |
8a1f658b | 581 | extern int execlp (__const char *__file, __const char *__arg, ...) |
4940d71b | 582 | __THROW __nonnull ((1, 2)); |
28f540f4 | 583 | |
3d5243d4 UD |
584 | #ifdef __USE_GNU |
585 | /* Execute FILE, searching in the `PATH' environment variable if it contains | |
586 | no slashes, with arguments ARGV and environment from `environ'. */ | |
587 | extern int execvpe (__const char *__file, char *__const __argv[], | |
588 | char *__const __envp[]) | |
4940d71b | 589 | __THROW __nonnull ((1, 2)); |
3d5243d4 UD |
590 | #endif |
591 | ||
28f540f4 | 592 | |
0d8733c4 | 593 | #if defined __USE_MISC || defined __USE_XOPEN |
a3e59be8 | 594 | /* Add INC to priority of the current process. */ |
0476597b | 595 | extern int nice (int __inc) __THROW __wur; |
a3e59be8 UD |
596 | #endif |
597 | ||
598 | ||
28f540f4 | 599 | /* Terminate program execution with the low-order 8 bits of STATUS. */ |
c1422e5b | 600 | extern void _exit (int __status) __attribute__ ((__noreturn__)); |
28f540f4 RM |
601 | |
602 | ||
603 | /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf'; | |
604 | the `_SC_*' symbols for the NAME argument to `sysconf'; | |
605 | and the `_CS_*' symbols for the NAME argument to `confstr'. */ | |
5107cf1d | 606 | #include <bits/confname.h> |
28f540f4 RM |
607 | |
608 | /* Get file-specific configuration information about PATH. */ | |
8a1f658b UD |
609 | extern long int pathconf (__const char *__path, int __name) |
610 | __THROW __nonnull ((1)); | |
28f540f4 RM |
611 | |
612 | /* Get file-specific configuration about descriptor FD. */ | |
966f66bb | 613 | extern long int fpathconf (int __fd, int __name) __THROW; |
28f540f4 RM |
614 | |
615 | /* Get the value of the system variable NAME. */ | |
11bf311e | 616 | extern long int sysconf (int __name) __THROW; |
28f540f4 RM |
617 | |
618 | #ifdef __USE_POSIX2 | |
619 | /* Get the value of the string-valued system variable NAME. */ | |
c1422e5b | 620 | extern size_t confstr (int __name, char *__buf, size_t __len) __THROW; |
28f540f4 RM |
621 | #endif |
622 | ||
623 | ||
624 | /* Get the process ID of the calling process. */ | |
c1422e5b | 625 | extern __pid_t getpid (void) __THROW; |
28f540f4 RM |
626 | |
627 | /* Get the process ID of the calling process's parent. */ | |
c1422e5b | 628 | extern __pid_t getppid (void) __THROW; |
28f540f4 | 629 | |
01cad722 UD |
630 | /* Get the process group ID of the calling process. |
631 | This function is different on old BSD. */ | |
632 | #ifndef __FAVOR_BSD | |
c1422e5b | 633 | extern __pid_t getpgrp (void) __THROW; |
01cad722 | 634 | #else |
f377d022 UD |
635 | # ifdef __REDIRECT_NTH |
636 | extern __pid_t __REDIRECT_NTH (getpgrp, (__pid_t __pid), __getpgid); | |
01cad722 UD |
637 | # else |
638 | # define getpgrp __getpgid | |
639 | # endif | |
0d8733c4 | 640 | #endif |
28f540f4 | 641 | |
28f540f4 | 642 | /* Get the process group ID of process PID. */ |
c1422e5b | 643 | extern __pid_t __getpgid (__pid_t __pid) __THROW; |
7cdb5a32 | 644 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 |
c1422e5b | 645 | extern __pid_t getpgid (__pid_t __pid) __THROW; |
28f540f4 RM |
646 | #endif |
647 | ||
01cad722 UD |
648 | |
649 | /* Set the process group ID of the process matching PID to PGID. | |
650 | If PID is zero, the current process's process group ID is set. | |
651 | If PGID is zero, the process ID of the process is used. */ | |
c1422e5b | 652 | extern int setpgid (__pid_t __pid, __pid_t __pgid) __THROW; |
01cad722 | 653 | |
0d8733c4 | 654 | #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED |
b20e47cb RM |
655 | /* Both System V and BSD have `setpgrp' functions, but with different |
656 | calling conventions. The BSD function is the same as POSIX.1 `setpgid' | |
657 | (above). The System V function takes no arguments and puts the calling | |
658 | process in its on group like `setpgid (0, 0)'. | |
659 | ||
660 | New programs should always use `setpgid' instead. | |
661 | ||
662 | The default in GNU is to provide the System V function. The BSD | |
01cad722 | 663 | function is available under -D_BSD_SOURCE. */ |
b20e47cb | 664 | |
dfd2257a | 665 | # ifndef __FAVOR_BSD |
b20e47cb RM |
666 | |
667 | /* Set the process group ID of the calling process to its own PID. | |
668 | This is exactly the same as `setpgid (0, 0)'. */ | |
c1422e5b | 669 | extern int setpgrp (void) __THROW; |
b20e47cb | 670 | |
dfd2257a | 671 | # else |
b20e47cb RM |
672 | |
673 | /* Another name for `setpgid' (above). */ | |
f377d022 UD |
674 | # ifdef __REDIRECT_NTH |
675 | extern int __REDIRECT_NTH (setpgrp, (__pid_t __pid, __pid_t __pgrp), setpgid); | |
01cad722 UD |
676 | # else |
677 | # define setpgrp setpgid | |
678 | # endif | |
b20e47cb | 679 | |
dfd2257a | 680 | # endif /* Favor BSD. */ |
b20e47cb | 681 | #endif /* Use SVID or BSD. */ |
28f540f4 RM |
682 | |
683 | /* Create a new session with the calling process as its leader. | |
684 | The process group IDs of the session and the calling process | |
685 | are set to the process ID of the calling process, which is returned. */ | |
c1422e5b | 686 | extern __pid_t setsid (void) __THROW; |
28f540f4 | 687 | |
7cdb5a32 | 688 | #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 |
b7843ea9 | 689 | /* Return the session ID of the given process. */ |
c1422e5b | 690 | extern __pid_t getsid (__pid_t __pid) __THROW; |
b7843ea9 RM |
691 | #endif |
692 | ||
28f540f4 | 693 | /* Get the real user ID of the calling process. */ |
c1422e5b | 694 | extern __uid_t getuid (void) __THROW; |
28f540f4 RM |
695 | |
696 | /* Get the effective user ID of the calling process. */ | |
c1422e5b | 697 | extern __uid_t geteuid (void) __THROW; |
28f540f4 RM |
698 | |
699 | /* Get the real group ID of the calling process. */ | |
c1422e5b | 700 | extern __gid_t getgid (void) __THROW; |
28f540f4 RM |
701 | |
702 | /* Get the effective group ID of the calling process. */ | |
c1422e5b | 703 | extern __gid_t getegid (void) __THROW; |
28f540f4 RM |
704 | |
705 | /* If SIZE is zero, return the number of supplementary groups | |
706 | the calling process is in. Otherwise, fill in the group IDs | |
707 | of its supplementary groups in LIST and return the number written. */ | |
0476597b | 708 | extern int getgroups (int __size, __gid_t __list[]) __THROW __wur; |
28f540f4 | 709 | |
3bbceb12 RM |
710 | #ifdef __USE_GNU |
711 | /* Return nonzero iff the calling process is in group GID. */ | |
c1422e5b | 712 | extern int group_member (__gid_t __gid) __THROW; |
3bbceb12 RM |
713 | #endif |
714 | ||
28f540f4 RM |
715 | /* Set the user ID of the calling process to UID. |
716 | If the calling process is the super-user, set the real | |
717 | and effective user IDs, and the saved set-user-ID to UID; | |
718 | if not, the effective user ID is set to UID. */ | |
c1422e5b | 719 | extern int setuid (__uid_t __uid) __THROW; |
28f540f4 | 720 | |
0d8733c4 | 721 | #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED |
28f540f4 RM |
722 | /* Set the real user ID of the calling process to RUID, |
723 | and the effective user ID of the calling process to EUID. */ | |
c1422e5b | 724 | extern int setreuid (__uid_t __ruid, __uid_t __euid) __THROW; |
2c6fe0bd | 725 | #endif |
28f540f4 | 726 | |
49833554 | 727 | #if defined __USE_BSD || defined __USE_XOPEN2K |
28f540f4 | 728 | /* Set the effective user ID of the calling process to UID. */ |
c1422e5b | 729 | extern int seteuid (__uid_t __uid) __THROW; |
28f540f4 RM |
730 | #endif /* Use BSD. */ |
731 | ||
732 | /* Set the group ID of the calling process to GID. | |
733 | If the calling process is the super-user, set the real | |
734 | and effective group IDs, and the saved set-group-ID to GID; | |
735 | if not, the effective group ID is set to GID. */ | |
c1422e5b | 736 | extern int setgid (__gid_t __gid) __THROW; |
28f540f4 | 737 | |
0d8733c4 | 738 | #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED |
28f540f4 RM |
739 | /* Set the real group ID of the calling process to RGID, |
740 | and the effective group ID of the calling process to EGID. */ | |
c1422e5b | 741 | extern int setregid (__gid_t __rgid, __gid_t __egid) __THROW; |
2c6fe0bd | 742 | #endif |
28f540f4 | 743 | |
49833554 | 744 | #if defined __USE_BSD || defined __USE_XOPEN2K |
28f540f4 | 745 | /* Set the effective group ID of the calling process to GID. */ |
c1422e5b | 746 | extern int setegid (__gid_t __gid) __THROW; |
28f540f4 RM |
747 | #endif /* Use BSD. */ |
748 | ||
747bf98e | 749 | #ifdef __USE_GNU |
0d5cb2c7 | 750 | /* Fetch the real user ID, effective user ID, and saved-set user ID, |
747bf98e | 751 | of the calling process. */ |
0d5cb2c7 | 752 | extern int getresuid (__uid_t *__ruid, __uid_t *__euid, __uid_t *__suid) |
0476597b | 753 | __THROW; |
747bf98e | 754 | |
0d5cb2c7 | 755 | /* Fetch the real group ID, effective group ID, and saved-set group ID, |
747bf98e | 756 | of the calling process. */ |
0d5cb2c7 | 757 | extern int getresgid (__gid_t *__rgid, __gid_t *__egid, __gid_t *__sgid) |
0476597b | 758 | __THROW; |
747bf98e | 759 | |
0d5cb2c7 RM |
760 | /* Set the real user ID, effective user ID, and saved-set user ID, |
761 | of the calling process to RUID, EUID, and SUID, respectively. */ | |
762 | extern int setresuid (__uid_t __ruid, __uid_t __euid, __uid_t __suid) | |
0476597b | 763 | __THROW; |
747bf98e | 764 | |
0d5cb2c7 RM |
765 | /* Set the real group ID, effective group ID, and saved-set group ID, |
766 | of the calling process to RGID, EGID, and SGID, respectively. */ | |
767 | extern int setresgid (__gid_t __rgid, __gid_t __egid, __gid_t __sgid) | |
0476597b | 768 | __THROW; |
747bf98e RM |
769 | #endif |
770 | ||
28f540f4 RM |
771 | |
772 | /* Clone the calling process, creating an exact copy. | |
773 | Return -1 for errors, 0 to the new process, | |
774 | and the process ID of the new process to the old process. */ | |
c1422e5b | 775 | extern __pid_t fork (void) __THROW; |
28f540f4 | 776 | |
21487cc9 UD |
777 | #if ((defined __USE_BSD || defined __USE_XOPEN_EXTENDED) \ |
778 | && !defined __USE_XOPEN2K8) || defined __USE_GNU | |
28f540f4 | 779 | /* Clone the calling process, but without copying the whole address space. |
05fdf2df | 780 | The calling process is suspended until the new process exits or is |
28f540f4 RM |
781 | replaced by a call to `execve'. Return -1 for errors, 0 to the new process, |
782 | and the process ID of the new process to the old process. */ | |
c1422e5b | 783 | extern __pid_t vfork (void) __THROW; |
28f540f4 RM |
784 | #endif /* Use BSD. */ |
785 | ||
786 | ||
787 | /* Return the pathname of the terminal FD is open on, or NULL on errors. | |
73299943 UD |
788 | The returned storage is good only until the next call to this function. */ |
789 | extern char *ttyname (int __fd) __THROW; | |
9d187dd4 | 790 | |
60478656 | 791 | /* Store at most BUFLEN characters of the pathname of the terminal FD is |
73299943 | 792 | open on in BUF. Return 0 on success, otherwise an error number. */ |
8a1f658b | 793 | extern int ttyname_r (int __fd, char *__buf, size_t __buflen) |
0476597b | 794 | __THROW __nonnull ((2)) __wur; |
28f540f4 RM |
795 | |
796 | /* Return 1 if FD is a valid descriptor associated | |
797 | with a terminal, zero if not. */ | |
c1422e5b | 798 | extern int isatty (int __fd) __THROW; |
28f540f4 | 799 | |
d921b304 UD |
800 | #if defined __USE_BSD \ |
801 | || (defined __USE_XOPEN_EXTENDED && !defined __USE_UNIX98) | |
1474b80f | 802 | /* Return the index into the active-logins file (utmp) for |
a9df8829 | 803 | the controlling terminal. */ |
c1422e5b | 804 | extern int ttyslot (void) __THROW; |
1474b80f RM |
805 | #endif |
806 | ||
28f540f4 RM |
807 | |
808 | /* Make a link to FROM named TO. */ | |
8a1f658b | 809 | extern int link (__const char *__from, __const char *__to) |
0476597b | 810 | __THROW __nonnull ((1, 2)) __wur; |
28f540f4 | 811 | |
0b8f25bb | 812 | #ifdef __USE_ATFILE |
5c46041a UD |
813 | /* Like link but relative paths in TO and FROM are interpreted relative |
814 | to FROMFD and TOFD respectively. */ | |
815 | extern int linkat (int __fromfd, __const char *__from, int __tofd, | |
5733ab93 UD |
816 | __const char *__to, int __flags) |
817 | __THROW __nonnull ((2, 4)) __wur; | |
5c46041a UD |
818 | #endif |
819 | ||
f2b0dc44 | 820 | #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K |
28f540f4 | 821 | /* Make a symbolic link to FROM named TO. */ |
8a1f658b | 822 | extern int symlink (__const char *__from, __const char *__to) |
0476597b | 823 | __THROW __nonnull ((1, 2)) __wur; |
28f540f4 RM |
824 | |
825 | /* Read the contents of the symbolic link PATH into no more than | |
826 | LEN bytes of BUF. The contents are not null-terminated. | |
827 | Returns the number of characters read, or -1 for errors. */ | |
6d893bd9 UD |
828 | extern ssize_t readlink (__const char *__restrict __path, |
829 | char *__restrict __buf, size_t __len) | |
830 | __THROW __nonnull ((1, 2)) __wur; | |
28f540f4 RM |
831 | #endif /* Use BSD. */ |
832 | ||
0b8f25bb | 833 | #ifdef __USE_ATFILE |
5c46041a UD |
834 | /* Like symlink but a relative path in TO is interpreted relative to TOFD. */ |
835 | extern int symlinkat (__const char *__from, int __tofd, | |
836 | __const char *__to) __THROW __nonnull ((1, 3)) __wur; | |
837 | ||
838 | /* Like readlink but a relative PATH is interpreted relative to FD. */ | |
6d893bd9 UD |
839 | extern ssize_t readlinkat (int __fd, __const char *__restrict __path, |
840 | char *__restrict __buf, size_t __len) | |
5c46041a UD |
841 | __THROW __nonnull ((2, 3)) __wur; |
842 | #endif | |
843 | ||
28f540f4 | 844 | /* Remove the link NAME. */ |
8a1f658b | 845 | extern int unlink (__const char *__name) __THROW __nonnull ((1)); |
28f540f4 | 846 | |
0b8f25bb | 847 | #ifdef __USE_ATFILE |
26cec518 UD |
848 | /* Remove the link NAME relative to FD. */ |
849 | extern int unlinkat (int __fd, __const char *__name, int __flag) | |
850 | __THROW __nonnull ((2)); | |
851 | #endif | |
852 | ||
28f540f4 | 853 | /* Remove the directory PATH. */ |
8a1f658b | 854 | extern int rmdir (__const char *__path) __THROW __nonnull ((1)); |
28f540f4 RM |
855 | |
856 | ||
857 | /* Return the foreground process group ID of FD. */ | |
c1422e5b | 858 | extern __pid_t tcgetpgrp (int __fd) __THROW; |
28f540f4 RM |
859 | |
860 | /* Set the foreground process group ID of FD set PGRP_ID. */ | |
c1422e5b | 861 | extern int tcsetpgrp (int __fd, __pid_t __pgrp_id) __THROW; |
28f540f4 RM |
862 | |
863 | ||
2c008571 UD |
864 | /* Return the login name of the user. |
865 | ||
866 | This function is a possible cancellation points and therefore not | |
867 | marked with __THROW. */ | |
868 | extern char *getlogin (void); | |
aa2c6b6d | 869 | #if defined __USE_REENTRANT || defined __USE_POSIX199506 |
ee188d55 | 870 | /* Return at most NAME_LEN characters of the login name of the user in NAME. |
6d52618b | 871 | If it cannot be determined or some other error occurred, return the error |
2c008571 UD |
872 | code. Otherwise return 0. |
873 | ||
874 | This function is a possible cancellation points and therefore not | |
875 | marked with __THROW. */ | |
8a1f658b | 876 | extern int getlogin_r (char *__name, size_t __name_len) __nonnull ((1)); |
ee188d55 | 877 | #endif |
28f540f4 RM |
878 | |
879 | #ifdef __USE_BSD | |
880 | /* Set the login name returned by `getlogin'. */ | |
8a1f658b | 881 | extern int setlogin (__const char *__name) __THROW __nonnull ((1)); |
28f540f4 RM |
882 | #endif |
883 | ||
884 | ||
885 | #ifdef __USE_POSIX2 | |
a379e56a UD |
886 | /* Get definitions and prototypes for functions to process the |
887 | arguments in ARGV (ARGC of them, minus the program name) for | |
888 | options given in OPTS. */ | |
889 | # define __need_getopt | |
890 | # include <getopt.h> | |
28f540f4 RM |
891 | #endif |
892 | ||
893 | ||
7cdb5a32 | 894 | #if defined __USE_BSD || defined __USE_UNIX98 || defined __USE_XOPEN2K |
28f540f4 RM |
895 | /* Put the name of the current host in no more than LEN bytes of NAME. |
896 | The result is null-terminated if LEN is large enough for the full | |
897 | name and the terminator. */ | |
8a1f658b | 898 | extern int gethostname (char *__name, size_t __len) __THROW __nonnull ((1)); |
639c3248 | 899 | #endif |
28f540f4 | 900 | |
639c3248 UD |
901 | |
902 | #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98) | |
28f540f4 RM |
903 | /* Set the name of the current host to NAME, which is LEN bytes long. |
904 | This call is restricted to the super-user. */ | |
8a1f658b | 905 | extern int sethostname (__const char *__name, size_t __len) |
0476597b | 906 | __THROW __nonnull ((1)) __wur; |
28f540f4 | 907 | |
28f540f4 RM |
908 | /* Set the current machine's Internet number to ID. |
909 | This call is restricted to the super-user. */ | |
0476597b | 910 | extern int sethostid (long int __id) __THROW __wur; |
28f540f4 RM |
911 | |
912 | ||
f5348425 RM |
913 | /* Get and set the NIS (aka YP) domain name, if any. |
914 | Called just like `gethostname' and `sethostname'. | |
915 | The NIS domain name is usually the empty string when not using NIS. */ | |
8a1f658b | 916 | extern int getdomainname (char *__name, size_t __len) |
0476597b | 917 | __THROW __nonnull ((1)) __wur; |
8a1f658b | 918 | extern int setdomainname (__const char *__name, size_t __len) |
0476597b | 919 | __THROW __nonnull ((1)) __wur; |
f5348425 RM |
920 | |
921 | ||
28f540f4 RM |
922 | /* Revoke access permissions to all processes currently communicating |
923 | with the control terminal, and then send a SIGHUP signal to the process | |
924 | group of the control terminal. */ | |
c1422e5b | 925 | extern int vhangup (void) __THROW; |
28f540f4 | 926 | |
342414a6 | 927 | /* Revoke the access of all descriptors currently open on FILE. */ |
0476597b | 928 | extern int revoke (__const char *__file) __THROW __nonnull ((1)) __wur; |
342414a6 | 929 | |
28f540f4 | 930 | |
ea03559a RM |
931 | /* Enable statistical profiling, writing samples of the PC into at most |
932 | SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling | |
933 | is enabled, the system examines the user PC and increments | |
934 | SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero, | |
935 | disable profiling. Returns zero on success, -1 on error. */ | |
c1422e5b | 936 | extern int profil (unsigned short int *__sample_buffer, size_t __size, |
8a1f658b UD |
937 | size_t __offset, unsigned int __scale) |
938 | __THROW __nonnull ((1)); | |
ea03559a RM |
939 | |
940 | ||
28f540f4 RM |
941 | /* Turn accounting on if NAME is an existing file. The system will then write |
942 | a record for each process as it terminates, to this file. If NAME is NULL, | |
943 | turn accounting off. This call is restricted to the super-user. */ | |
fb1887c7 | 944 | extern int acct (__const char *__name) __THROW; |
28f540f4 | 945 | |
28f540f4 RM |
946 | |
947 | /* Successive calls return the shells listed in `/etc/shells'. */ | |
c1422e5b UD |
948 | extern char *getusershell (void) __THROW; |
949 | extern void endusershell (void) __THROW; /* Discard cached info. */ | |
950 | extern void setusershell (void) __THROW; /* Rewind and re-read the file. */ | |
28f540f4 RM |
951 | |
952 | ||
28f540f4 RM |
953 | /* Put the program in the background, and dissociate from the controlling |
954 | terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero, | |
955 | redirects stdin, stdout, and stderr to /dev/null. */ | |
0476597b | 956 | extern int daemon (int __nochdir, int __noclose) __THROW __wur; |
2c6fe0bd | 957 | #endif /* Use BSD || X/Open. */ |
28f540f4 RM |
958 | |
959 | ||
d921b304 UD |
960 | #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_XOPEN2K) |
961 | /* Make PATH be the root directory (the starting point for absolute paths). | |
962 | This call is restricted to the super-user. */ | |
0476597b | 963 | extern int chroot (__const char *__path) __THROW __nonnull ((1)) __wur; |
d921b304 UD |
964 | |
965 | /* Prompt with PROMPT and read a string from the terminal without echoing. | |
966 | Uses /dev/tty if possible; otherwise stderr and stdin. */ | |
8a1f658b | 967 | extern char *getpass (__const char *__prompt) __nonnull ((1)); |
d921b304 UD |
968 | #endif /* Use BSD || X/Open. */ |
969 | ||
970 | ||
6701afc7 | 971 | #if defined __USE_BSD || defined __USE_XOPEN || defined __USE_XOPEN2K |
2c008571 UD |
972 | /* Make all changes done to FD actually appear on disk. |
973 | ||
974 | This function is a cancellation point and therefore not marked with | |
975 | __THROW. */ | |
976 | extern int fsync (int __fd); | |
ae4287f8 | 977 | #endif /* Use BSD || X/Open || Unix98. */ |
d921b304 UD |
978 | |
979 | ||
0d8733c4 | 980 | #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED |
2c6fe0bd | 981 | |
ce42435c UD |
982 | /* Return identifier for the current host. */ |
983 | extern long int gethostid (void); | |
28f540f4 | 984 | |
2c6fe0bd | 985 | /* Make all changes done to all files actually appear on disk. */ |
7287c36d | 986 | extern void sync (void) __THROW; |
28f540f4 | 987 | |
28f540f4 | 988 | |
52e2ea9a | 989 | # if defined __USE_BSD || !defined __USE_XOPEN2K |
2c6fe0bd UD |
990 | /* Return the number of bytes in a page. This is the system's page size, |
991 | which is not necessarily the same as the hardware page size. */ | |
16f282b8 | 992 | extern int getpagesize (void) __THROW __attribute__ ((__const__)); |
2c6fe0bd UD |
993 | |
994 | ||
f14038f2 UD |
995 | /* Return the maximum number of file descriptors |
996 | the current process could possibly have. */ | |
997 | extern int getdtablesize (void) __THROW; | |
52e2ea9a | 998 | # endif |
f14038f2 | 999 | |
7cdb5a32 UD |
1000 | #endif /* Use BSD || X/Open Unix. */ |
1001 | ||
1002 | ||
1003 | #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8 | |
f14038f2 | 1004 | |
2c6fe0bd | 1005 | /* Truncate FILE to LENGTH bytes. */ |
d921b304 | 1006 | # ifndef __USE_FILE_OFFSET64 |
8a1f658b | 1007 | extern int truncate (__const char *__file, __off_t __length) |
0476597b | 1008 | __THROW __nonnull ((1)) __wur; |
d921b304 | 1009 | # else |
f377d022 UD |
1010 | # ifdef __REDIRECT_NTH |
1011 | extern int __REDIRECT_NTH (truncate, | |
1012 | (__const char *__file, __off64_t __length), | |
0476597b | 1013 | truncate64) __nonnull ((1)) __wur; |
d921b304 UD |
1014 | # else |
1015 | # define truncate truncate64 | |
1016 | # endif | |
01cad722 | 1017 | # endif |
d921b304 | 1018 | # ifdef __USE_LARGEFILE64 |
8a1f658b | 1019 | extern int truncate64 (__const char *__file, __off64_t __length) |
0476597b | 1020 | __THROW __nonnull ((1)) __wur; |
d921b304 | 1021 | # endif |
2c6fe0bd | 1022 | |
f14038f2 | 1023 | |
2c6fe0bd | 1024 | /* Truncate the file FD is open on to LENGTH bytes. */ |
d921b304 | 1025 | # ifndef __USE_FILE_OFFSET64 |
0476597b | 1026 | extern int ftruncate (int __fd, __off_t __length) __THROW __wur; |
d921b304 | 1027 | # else |
f377d022 UD |
1028 | # ifdef __REDIRECT_NTH |
1029 | extern int __REDIRECT_NTH (ftruncate, (int __fd, __off64_t __length), | |
0476597b | 1030 | ftruncate64) __wur; |
d921b304 UD |
1031 | # else |
1032 | # define ftruncate ftruncate64 | |
1033 | # endif | |
01cad722 | 1034 | # endif |
d921b304 | 1035 | # ifdef __USE_LARGEFILE64 |
0476597b | 1036 | extern int ftruncate64 (int __fd, __off64_t __length) __THROW __wur; |
d921b304 | 1037 | # endif |
2c6fe0bd | 1038 | |
f14038f2 | 1039 | #endif /* Use BSD || X/Open Unix || POSIX 2003. */ |
2c6fe0bd UD |
1040 | |
1041 | ||
7cdb5a32 UD |
1042 | #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) \ |
1043 | && !defined __USE_XOPEN2K | |
28f540f4 | 1044 | |
196980f5 RM |
1045 | /* Set the end of accessible data space (aka "the break") to ADDR. |
1046 | Returns zero on success and -1 for errors (with errno set). */ | |
0476597b | 1047 | extern int brk (void *__addr) __THROW __wur; |
196980f5 | 1048 | |
196980f5 RM |
1049 | /* Increase or decrease the end of accessible data space by DELTA bytes. |
1050 | If successful, returns the address the previous end of data space | |
1051 | (i.e. the beginning of the new space, if DELTA > 0); | |
1052 | returns (void *) -1 for errors (with errno set). */ | |
0ed99ce4 | 1053 | extern void *sbrk (intptr_t __delta) __THROW; |
2c6fe0bd | 1054 | #endif |
196980f5 RM |
1055 | |
1056 | ||
2c6fe0bd | 1057 | #ifdef __USE_MISC |
28f540f4 RM |
1058 | /* Invoke `system call' number SYSNO, passing it the remaining arguments. |
1059 | This is completely system-dependent, and not often useful. | |
1060 | ||
1061 | In Unix, `syscall' sets `errno' for all errors and most calls return -1 | |
1062 | for errors; in many systems you cannot pass arguments or get return | |
1063 | values for all system calls (`pipe', `fork', and `getppid' typically | |
1064 | among them). | |
1065 | ||
1066 | In Mach, all system calls take normal arguments and always return an | |
1067 | error code (zero for success). */ | |
c1422e5b | 1068 | extern long int syscall (long int __sysno, ...) __THROW; |
28f540f4 RM |
1069 | |
1070 | #endif /* Use misc. */ | |
1071 | ||
1072 | ||
0d8733c4 | 1073 | #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK |
28f540f4 RM |
1074 | /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both |
1075 | files consistent. Some systems have them there and some here, and some | |
1076 | software depends on the macros being defined without including both. */ | |
1077 | ||
1078 | /* `lockf' is a simpler interface to the locking facilities of `fcntl'. | |
1079 | LEN is always relative to the current file position. | |
2c008571 UD |
1080 | The CMD argument is one of the following. |
1081 | ||
1082 | This function is a cancellation point and therefore not marked with | |
1083 | __THROW. */ | |
28f540f4 | 1084 | |
a5a0310d UD |
1085 | # define F_ULOCK 0 /* Unlock a previously locked region. */ |
1086 | # define F_LOCK 1 /* Lock a region for exclusive use. */ | |
1087 | # define F_TLOCK 2 /* Test and lock a region for exclusive use. */ | |
1088 | # define F_TEST 3 /* Test a region for other processes locks. */ | |
28f540f4 | 1089 | |
dfd2257a | 1090 | # ifndef __USE_FILE_OFFSET64 |
0476597b | 1091 | extern int lockf (int __fd, int __cmd, __off_t __len) __wur; |
dfd2257a | 1092 | # else |
01cad722 | 1093 | # ifdef __REDIRECT |
2c008571 | 1094 | extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), |
0476597b | 1095 | lockf64) __wur; |
01cad722 UD |
1096 | # else |
1097 | # define lockf lockf64 | |
1098 | # endif | |
dfd2257a UD |
1099 | # endif |
1100 | # ifdef __USE_LARGEFILE64 | |
0476597b | 1101 | extern int lockf64 (int __fd, int __cmd, __off64_t __len) __wur; |
dfd2257a | 1102 | # endif |
28f540f4 RM |
1103 | #endif /* Use misc and F_LOCK not already defined. */ |
1104 | ||
1105 | ||
1106 | #ifdef __USE_GNU | |
1107 | ||
1108 | /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno' | |
1109 | set to EINTR. */ | |
1110 | ||
a5a0310d | 1111 | # define TEMP_FAILURE_RETRY(expression) \ |
036cc82f RM |
1112 | (__extension__ \ |
1113 | ({ long int __result; \ | |
28f540f4 RM |
1114 | do __result = (long int) (expression); \ |
1115 | while (__result == -1L && errno == EINTR); \ | |
06535ae9 | 1116 | __result; })) |
28f540f4 RM |
1117 | #endif |
1118 | ||
a5a0310d | 1119 | #if defined __USE_POSIX199309 || defined __USE_UNIX98 |
7b3547eb RM |
1120 | /* Synchronize at least the data part of a file with the underlying |
1121 | media. */ | |
aa75f64c | 1122 | extern int fdatasync (int __fildes); |
6d52618b | 1123 | #endif /* Use POSIX199309 */ |
7b3547eb | 1124 | |
2c6fe0bd UD |
1125 | |
1126 | /* XPG4.2 specifies that prototypes for the encryption functions must | |
1127 | be defined here. */ | |
1128 | #ifdef __USE_XOPEN | |
1129 | /* Encrypt at most 8 characters from KEY using salt to perturb DES. */ | |
8a1f658b UD |
1130 | extern char *crypt (__const char *__key, __const char *__salt) |
1131 | __THROW __nonnull ((1, 2)); | |
2c6fe0bd | 1132 | |
2c6fe0bd UD |
1133 | /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt |
1134 | block in place. */ | |
8a1f658b | 1135 | extern void encrypt (char *__block, int __edflag) __THROW __nonnull ((1)); |
2c6fe0bd UD |
1136 | |
1137 | ||
1138 | /* Swab pairs bytes in the first N bytes of the area pointed to by | |
1139 | FROM and copy the result to TO. The value of TO must not be in the | |
1140 | range [FROM - N + 1, FROM - 1]. If N is odd the first byte in FROM | |
1141 | is without partner. */ | |
98cbe360 | 1142 | extern void swab (__const void *__restrict __from, void *__restrict __to, |
8a1f658b | 1143 | ssize_t __n) __THROW __nonnull ((1, 2)); |
a5a0310d UD |
1144 | #endif |
1145 | ||
1146 | ||
8de72f53 UD |
1147 | /* The Single Unix specification demands this prototype to be here. |
1148 | It is also found in <stdio.h>. */ | |
7cdb5a32 | 1149 | #if defined __USE_XOPEN || defined __USE_XOPEN2K8 |
a5a0310d | 1150 | /* Return the name of the controlling terminal. */ |
35c2fd59 | 1151 | extern char *ctermid (char *__s) __THROW; |
e918a7fe UD |
1152 | #endif |
1153 | ||
553cc5f9 | 1154 | |
f2b0dc44 | 1155 | /* Define some macros helping to catch buffer overflows. */ |
de1c3ebb | 1156 | #if __USE_FORTIFY_LEVEL > 0 && defined __extern_always_inline |
f2b0dc44 UD |
1157 | # include <bits/unistd.h> |
1158 | #endif | |
1159 | ||
28f540f4 RM |
1160 | __END_DECLS |
1161 | ||
1162 | #endif /* unistd.h */ |