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0476597b | 1 | /* Copyright (C) 1991-2003, 2004, 2005 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 | |
148bb057 UD |
33 | /* POSIX Standard approved as ISO/IEC 9945-1 as of December 2001. */ |
34 | #define _POSIX_VERSION 200112L | |
28f540f4 RM |
35 | |
36 | /* These are not #ifdef __USE_POSIX2 because they are | |
37 | in the theoretically application-owned namespace. */ | |
38 | ||
9756dfe1 | 39 | /* The utilities on GNU systems also correspond to this version. */ |
148bb057 | 40 | #define _POSIX2_VERSION 200112L |
9756dfe1 | 41 | |
28f540f4 RM |
42 | /* If defined, the implementation supports the |
43 | C Language Bindings Option. */ | |
148bb057 | 44 | #define _POSIX2_C_BIND 200112L |
28f540f4 RM |
45 | |
46 | /* If defined, the implementation supports the | |
47 | C Language Development Utilities Option. */ | |
148bb057 | 48 | #define _POSIX2_C_DEV 200112L |
28f540f4 RM |
49 | |
50 | /* If defined, the implementation supports the | |
51 | Software Development Utilities Option. */ | |
148bb057 | 52 | #define _POSIX2_SW_DEV 200112L |
28f540f4 | 53 | |
19bc17a9 RM |
54 | /* If defined, the implementation supports the |
55 | creation of locales with the localedef utility. */ | |
148bb057 | 56 | #define _POSIX2_LOCALEDEF 200112L |
19bc17a9 | 57 | |
9756dfe1 | 58 | /* X/Open version number to which the library conforms. It is selectable. */ |
a334319f | 59 | #ifdef __USE_UNIX98 |
9756dfe1 UD |
60 | # define _XOPEN_VERSION 500 |
61 | #else | |
62 | # define _XOPEN_VERSION 4 | |
63 | #endif | |
845dcb57 | 64 | |
2c6fe0bd UD |
65 | /* Commands and utilities from XPG4 are available. */ |
66 | #define _XOPEN_XCU_VERSION 4 | |
67 | ||
68 | /* We are compatible with the old published standards as well. */ | |
69 | #define _XOPEN_XPG2 1 | |
70 | #define _XOPEN_XPG3 1 | |
71 | #define _XOPEN_XPG4 1 | |
72 | ||
73 | /* The X/Open Unix extensions are available. */ | |
74 | #define _XOPEN_UNIX 1 | |
75 | ||
76 | /* Encryption is present. */ | |
77 | #define _XOPEN_CRYPT 1 | |
78 | ||
afd4eb37 | 79 | /* The enhanced internationalization capabilities according to XPG4.2 |
2c6fe0bd UD |
80 | are present. */ |
81 | #define _XOPEN_ENH_I18N 1 | |
82 | ||
cbdee279 UD |
83 | /* The legacy interfaces are also available. */ |
84 | #define _XOPEN_LEGACY 1 | |
85 | ||
28f540f4 RM |
86 | |
87 | /* Get values of POSIX options: | |
88 | ||
89 | If these symbols are defined, the corresponding features are | |
90 | always available. If not, they may be available sometimes. | |
91 | The current values can be obtained with `sysconf'. | |
92 | ||
7b3547eb RM |
93 | _POSIX_JOB_CONTROL Job control is supported. |
94 | _POSIX_SAVED_IDS Processes have a saved set-user-ID | |
6991feeb | 95 | and a saved set-group-ID. |
7b3547eb RM |
96 | _POSIX_REALTIME_SIGNALS Real-time, queued signals are supported. |
97 | _POSIX_PRIORITY_SCHEDULING Priority scheduling is supported. | |
98 | _POSIX_TIMERS POSIX.4 clocks and timers are supported. | |
99 | _POSIX_ASYNCHRONOUS_IO Asynchronous I/O is supported. | |
100 | _POSIX_PRIORITIZED_IO Prioritized asynchronous I/O is supported. | |
101 | _POSIX_SYNCHRONIZED_IO Synchronizing file data is supported. | |
102 | _POSIX_FSYNC The fsync function is present. | |
103 | _POSIX_MAPPED_FILES Mapping of files to memory is supported. | |
104 | _POSIX_MEMLOCK Locking of all memory is supported. | |
105 | _POSIX_MEMLOCK_RANGE Locking of ranges of memory is supported. | |
106 | _POSIX_MEMORY_PROTECTION Setting of memory protections is supported. | |
107 | _POSIX_MESSAGE_PASSING POSIX.4 message queues are supported. | |
108 | _POSIX_SEMAPHORES POSIX.4 counting semaphores are supported. | |
109 | _POSIX_SHARED_MEMORY_OBJECTS POSIX.4 shared memory objects are supported. | |
af6f3906 UD |
110 | _POSIX_THREADS POSIX.1c pthreads are supported. |
111 | _POSIX_THREAD_ATTR_STACKADDR Thread stack address attribute option supported. | |
112 | _POSIX_THREAD_ATTR_STACKSIZE Thread stack size attribute option supported. | |
113 | _POSIX_THREAD_SAFE_FUNCTIONS Thread-safe functions are supported. | |
114 | _POSIX_THREAD_PRIORITY_SCHEDULING | |
115 | POSIX.1c thread execution scheduling supported. | |
116 | _POSIX_THREAD_PRIO_INHERIT Thread priority inheritance option supported. | |
117 | _POSIX_THREAD_PRIO_PROTECT Thread priority protection option supported. | |
118 | _POSIX_THREAD_PROCESS_SHARED Process-shared synchronization supported. | |
503054c0 RM |
119 | _POSIX_PII Protocol-independent interfaces are supported. |
120 | _POSIX_PII_XTI XTI protocol-indep. interfaces are supported. | |
121 | _POSIX_PII_SOCKET Socket protocol-indep. interfaces are supported. | |
122 | _POSIX_PII_INTERNET Internet family of protocols supported. | |
123 | _POSIX_PII_INTERNET_STREAM Connection-mode Internet protocol supported. | |
124 | _POSIX_PII_INTERNET_DGRAM Connectionless Internet protocol supported. | |
125 | _POSIX_PII_OSI ISO/OSI family of protocols supported. | |
126 | _POSIX_PII_OSI_COTS Connection-mode ISO/OSI service supported. | |
127 | _POSIX_PII_OSI_CLTS Connectionless ISO/OSI service supported. | |
128 | _POSIX_POLL Implementation supports `poll' function. | |
129 | _POSIX_SELECT Implementation supports `select' and `pselect'. | |
28f540f4 | 130 | |
cbdee279 UD |
131 | _XOPEN_REALTIME X/Open realtime support is available. |
132 | _XOPEN_REALTIME_THREADS X/Open realtime thread support is available. | |
2c6fe0bd UD |
133 | _XOPEN_SHM Shared memory interface according to XPG4.2. |
134 | ||
86187531 UD |
135 | _XBS5_ILP32_OFF32 Implementation provides environment with 32-bit |
136 | int, long, pointer, and off_t types. | |
137 | _XBS5_ILP32_OFFBIG Implementation provides environment with 32-bit | |
138 | int, long, and pointer and off_t with at least | |
139 | 64 bits. | |
140 | _XBS5_LP64_OFF64 Implementation provides environment with 32-bit | |
141 | int, and 64-bit long, pointer, and off_t types. | |
142 | _XBS5_LPBIG_OFFBIG Implementation provides environment with at | |
143 | least 32 bits int and long, pointer, and off_t | |
144 | with at least 64 bits. | |
145 | ||
28f540f4 RM |
146 | If any of these symbols is defined as -1, the corresponding option is not |
147 | true for any file. If any is defined as other than -1, the corresponding | |
148 | option is true for all files. If a symbol is not defined at all, the value | |
149 | for a specific file can be obtained from `pathconf' and `fpathconf'. | |
150 | ||
151 | _POSIX_CHOWN_RESTRICTED Only the super user can use `chown' to change | |
6991feeb | 152 | the owner of a file. `chown' can only be used |
28f540f4 RM |
153 | to change the group ID of a file to a group of |
154 | which the calling process is a member. | |
155 | _POSIX_NO_TRUNC Pathname components longer than | |
6991feeb | 156 | NAME_MAX generate an error. |
28f540f4 RM |
157 | _POSIX_VDISABLE If defined, if the value of an element of the |
158 | `c_cc' member of `struct termios' is | |
159 | _POSIX_VDISABLE, no character will have the | |
160 | effect associated with that element. | |
75cd5204 RM |
161 | _POSIX_SYNC_IO Synchronous I/O may be performed. |
162 | _POSIX_ASYNC_IO Asynchronous I/O may be performed. | |
163 | _POSIX_PRIO_IO Prioritized Asynchronous I/O may be performed. | |
dfd2257a UD |
164 | |
165 | Support for the Large File Support interface is not generally available. | |
166 | If it is available the following constants are defined to one. | |
167 | _LFS64_LARGEFILE Low-level I/O supports large files. | |
168 | _LFS64_STDIO Standard I/O supports large files. | |
28f540f4 RM |
169 | */ |
170 | ||
5107cf1d | 171 | #include <bits/posix_opt.h> |
28f540f4 | 172 | |
cbdee279 UD |
173 | /* Get the environment definitions from Unix98. */ |
174 | #ifdef __USE_UNIX98 | |
175 | # include <bits/environments.h> | |
176 | #endif | |
28f540f4 RM |
177 | |
178 | /* Standard file descriptors. */ | |
179 | #define STDIN_FILENO 0 /* Standard input. */ | |
180 | #define STDOUT_FILENO 1 /* Standard output. */ | |
181 | #define STDERR_FILENO 2 /* Standard error output. */ | |
182 | ||
183 | ||
184 | /* All functions that are not declared anywhere else. */ | |
185 | ||
5107cf1d | 186 | #include <bits/types.h> |
28f540f4 | 187 | |
7df789e0 | 188 | #ifndef __ssize_t_defined |
a68b0d31 | 189 | typedef __ssize_t ssize_t; |
7df789e0 | 190 | # define __ssize_t_defined |
28f540f4 RM |
191 | #endif |
192 | ||
193 | #define __need_size_t | |
194 | #define __need_NULL | |
195 | #include <stddef.h> | |
196 | ||
7a80496f | 197 | #if defined __USE_XOPEN || defined __USE_XOPEN2K |
a5a0310d UD |
198 | /* The Single Unix specification says that some more types are |
199 | available here. */ | |
7df789e0 | 200 | # ifndef __gid_t_defined |
a5a0310d | 201 | typedef __gid_t gid_t; |
7df789e0 | 202 | # define __gid_t_defined |
a5a0310d UD |
203 | # endif |
204 | ||
7df789e0 | 205 | # ifndef __uid_t_defined |
a5a0310d | 206 | typedef __uid_t uid_t; |
7df789e0 | 207 | # define __uid_t_defined |
a5a0310d UD |
208 | # endif |
209 | ||
7df789e0 | 210 | # ifndef __off_t_defined |
dfd2257a | 211 | # ifndef __USE_FILE_OFFSET64 |
a5a0310d | 212 | typedef __off_t off_t; |
dfd2257a UD |
213 | # else |
214 | typedef __off64_t off_t; | |
215 | # endif | |
7df789e0 | 216 | # define __off_t_defined |
a5a0310d | 217 | # endif |
7df789e0 | 218 | # if defined __USE_LARGEFILE64 && !defined __off64_t_defined |
dfd2257a | 219 | typedef __off64_t off64_t; |
7df789e0 | 220 | # define __off64_t_defined |
dfd2257a | 221 | # endif |
a5a0310d | 222 | |
7707af89 UD |
223 | # ifndef __useconds_t_defined |
224 | typedef __useconds_t useconds_t; | |
225 | # define __useconds_t_defined | |
226 | # endif | |
227 | ||
7df789e0 | 228 | # ifndef __pid_t_defined |
a5a0310d | 229 | typedef __pid_t pid_t; |
7df789e0 | 230 | # define __pid_t_defined |
a5a0310d | 231 | # endif |
e918a7fe | 232 | #endif /* X/Open */ |
4bae5567 | 233 | |
4c63ebaa | 234 | #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED |
7df789e0 | 235 | # ifndef __intptr_t_defined |
4bae5567 | 236 | typedef __intptr_t intptr_t; |
7df789e0 | 237 | # define __intptr_t_defined |
4bae5567 | 238 | # endif |
4c63ebaa | 239 | #endif |
28f540f4 | 240 | |
750f9af6 UD |
241 | #if defined __USE_BSD || defined __USE_XOPEN |
242 | # ifndef __socklen_t_defined | |
243 | typedef __socklen_t socklen_t; | |
244 | # define __socklen_t_defined | |
245 | # endif | |
246 | #endif | |
247 | ||
28f540f4 RM |
248 | /* Values for the second argument to access. |
249 | These may be OR'd together. */ | |
250 | #define R_OK 4 /* Test for read permission. */ | |
251 | #define W_OK 2 /* Test for write permission. */ | |
252 | #define X_OK 1 /* Test for execute permission. */ | |
253 | #define F_OK 0 /* Test for existence. */ | |
254 | ||
22a1292a | 255 | /* Test for access to NAME using the real UID and real GID. */ |
8a1f658b | 256 | extern int access (__const char *__name, int __type) __THROW __nonnull ((1)); |
28f540f4 | 257 | |
22a1292a RM |
258 | #ifdef __USE_GNU |
259 | /* Test for access to NAME using the effective UID and GID | |
260 | (as normal file operations use). */ | |
8a1f658b UD |
261 | extern int euidaccess (__const char *__name, int __type) |
262 | __THROW __nonnull ((1)); | |
22a1292a RM |
263 | #endif |
264 | ||
28f540f4 RM |
265 | |
266 | /* Values for the WHENCE argument to lseek. */ | |
267 | #ifndef _STDIO_H /* <stdio.h> has the same definitions. */ | |
a5a0310d UD |
268 | # define SEEK_SET 0 /* Seek from beginning of file. */ |
269 | # define SEEK_CUR 1 /* Seek from current position. */ | |
270 | # define SEEK_END 2 /* Seek from end of file. */ | |
28f540f4 RM |
271 | #endif |
272 | ||
0d8733c4 | 273 | #if defined __USE_BSD && !defined L_SET |
1474b80f | 274 | /* Old BSD names for the same constants; just for compatibility. */ |
a5a0310d UD |
275 | # define L_SET SEEK_SET |
276 | # define L_INCR SEEK_CUR | |
277 | # define L_XTND SEEK_END | |
1474b80f RM |
278 | #endif |
279 | ||
280 | ||
28f540f4 RM |
281 | /* Move FD's file position to OFFSET bytes from the |
282 | beginning of the file (if WHENCE is SEEK_SET), | |
283 | the current position (if WHENCE is SEEK_CUR), | |
284 | or the end of the file (if WHENCE is SEEK_END). | |
285 | Return the new file position. */ | |
dfd2257a | 286 | #ifndef __USE_FILE_OFFSET64 |
c1422e5b | 287 | extern __off_t lseek (int __fd, __off_t __offset, int __whence) __THROW; |
dfd2257a | 288 | #else |
f377d022 UD |
289 | # ifdef __REDIRECT_NTH |
290 | extern __off64_t __REDIRECT_NTH (lseek, | |
291 | (int __fd, __off64_t __offset, int __whence), | |
292 | lseek64); | |
01cad722 UD |
293 | # else |
294 | # define lseek lseek64 | |
295 | # endif | |
dfd2257a UD |
296 | #endif |
297 | #ifdef __USE_LARGEFILE64 | |
0476597b UD |
298 | extern __off64_t lseek64 (int __fd, __off64_t __offset, int __whence) |
299 | __THROW; | |
dfd2257a | 300 | #endif |
28f540f4 | 301 | |
2c008571 UD |
302 | /* Close the file descriptor FD. |
303 | ||
304 | This function is a cancellation point and therefore not marked with | |
305 | __THROW. */ | |
306 | extern int close (int __fd); | |
28f540f4 RM |
307 | |
308 | /* Read NBYTES into BUF from FD. Return the | |
2c008571 UD |
309 | number read, -1 for errors or 0 for EOF. |
310 | ||
311 | This function is a cancellation point and therefore not marked with | |
312 | __THROW. */ | |
0476597b | 313 | extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur; |
2c008571 UD |
314 | |
315 | /* Write N bytes of BUF to FD. Return the number written, or -1. | |
28f540f4 | 316 | |
2c008571 UD |
317 | This function is a cancellation point and therefore not marked with |
318 | __THROW. */ | |
0476597b | 319 | extern ssize_t write (int __fd, __const void *__buf, size_t __n) __wur; |
28f540f4 | 320 | |
a5a0310d | 321 | #ifdef __USE_UNIX98 |
dfd2257a | 322 | # ifndef __USE_FILE_OFFSET64 |
2c008571 UD |
323 | /* Read NBYTES into BUF from FD at the given position OFFSET without |
324 | changing the file pointer. Return the number read, -1 for errors | |
325 | or 0 for EOF. | |
326 | ||
327 | This function is a cancellation point and therefore not marked with | |
328 | __THROW. */ | |
329 | extern ssize_t pread (int __fd, void *__buf, size_t __nbytes, | |
0476597b | 330 | __off_t __offset) __wur; |
2c008571 UD |
331 | |
332 | /* Write N bytes of BUF to FD at the given position OFFSET without | |
333 | changing the file pointer. Return the number written, or -1. | |
334 | ||
335 | This function is a cancellation point and therefore not marked with | |
336 | __THROW. */ | |
c1422e5b | 337 | extern ssize_t pwrite (int __fd, __const void *__buf, size_t __n, |
0476597b | 338 | __off_t __offset) __wur; |
dfd2257a | 339 | # else |
01cad722 | 340 | # ifdef __REDIRECT |
c1422e5b | 341 | extern ssize_t __REDIRECT (pread, (int __fd, void *__buf, size_t __nbytes, |
2c008571 | 342 | __off64_t __offset), |
0476597b | 343 | pread64) __wur; |
c1422e5b | 344 | extern ssize_t __REDIRECT (pwrite, (int __fd, __const void *__buf, |
2c008571 | 345 | size_t __nbytes, __off64_t __offset), |
0476597b | 346 | pwrite64) __wur; |
01cad722 UD |
347 | # else |
348 | # define pread pread64 | |
349 | # define pwrite pwrite64 | |
350 | # endif | |
dfd2257a | 351 | # endif |
01cad722 | 352 | |
dfd2257a | 353 | # ifdef __USE_LARGEFILE64 |
6991feeb AJ |
354 | /* Read NBYTES into BUF from FD at the given position OFFSET without |
355 | changing the file pointer. Return the number read, -1 for errors | |
356 | or 0 for EOF. */ | |
c1422e5b | 357 | extern ssize_t pread64 (int __fd, void *__buf, size_t __nbytes, |
0476597b | 358 | __off64_t __offset) __wur; |
6991feeb AJ |
359 | /* Write N bytes of BUF to FD at the given position OFFSET without |
360 | changing the file pointer. Return the number written, or -1. */ | |
c1422e5b | 361 | extern ssize_t pwrite64 (int __fd, __const void *__buf, size_t __n, |
0476597b | 362 | __off64_t __offset) __wur; |
dfd2257a | 363 | # endif |
a5a0310d UD |
364 | #endif |
365 | ||
28f540f4 | 366 | /* Create a one-way communication channel (pipe). |
6d52618b | 367 | If successful, two file descriptors are stored in PIPEDES; |
28f540f4 RM |
368 | bytes written on PIPEDES[1] can be read from PIPEDES[0]. |
369 | Returns 0 if successful, -1 if not. */ | |
0476597b | 370 | extern int pipe (int __pipedes[2]) __THROW __wur; |
28f540f4 RM |
371 | |
372 | /* Schedule an alarm. In SECONDS seconds, the process will get a SIGALRM. | |
373 | If SECONDS is zero, any currently scheduled alarm will be cancelled. | |
374 | The function returns the number of seconds remaining until the last | |
375 | alarm scheduled would have signaled, or zero if there wasn't one. | |
376 | There is no return value to indicate an error, but you can set `errno' | |
377 | to 0 and check its value after calling `alarm', and this might tell you. | |
378 | The signal may come late due to processor scheduling. */ | |
c1422e5b | 379 | extern unsigned int alarm (unsigned int __seconds) __THROW; |
28f540f4 RM |
380 | |
381 | /* Make the process sleep for SECONDS seconds, or until a signal arrives | |
382 | and is not ignored. The function returns the number of seconds less | |
383 | than SECONDS which it actually slept (thus zero if it slept the full time). | |
384 | If a signal handler does a `longjmp' or modifies the handling of the | |
385 | SIGALRM signal while inside `sleep' call, the handling of the SIGALRM | |
386 | signal afterwards is undefined. There is no return value to indicate | |
2c008571 UD |
387 | error, but if `sleep' returns SECONDS, it probably didn't work. |
388 | ||
389 | This function is a cancellation point and therefore not marked with | |
390 | __THROW. */ | |
391 | extern unsigned int sleep (unsigned int __seconds); | |
28f540f4 | 392 | |
0d8733c4 | 393 | #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED |
2c6fe0bd UD |
394 | /* Set an alarm to go off (generating a SIGALRM signal) in VALUE |
395 | microseconds. If INTERVAL is nonzero, when the alarm goes off, the | |
396 | timer is reset to go off every INTERVAL microseconds thereafter. | |
397 | Returns the number of microseconds remaining before the alarm. */ | |
c1422e5b UD |
398 | extern __useconds_t ualarm (__useconds_t __value, __useconds_t __interval) |
399 | __THROW; | |
2c6fe0bd | 400 | |
52e9a9d1 | 401 | /* Sleep USECONDS microseconds, or until a signal arrives that is not blocked |
2c008571 UD |
402 | or ignored. |
403 | ||
404 | This function is a cancellation point and therefore not marked with | |
405 | __THROW. */ | |
406 | extern int usleep (__useconds_t __useconds); | |
52e9a9d1 RM |
407 | #endif |
408 | ||
28f540f4 RM |
409 | |
410 | /* Suspend the process until a signal arrives. | |
2c008571 UD |
411 | This always returns -1 and sets `errno' to EINTR. |
412 | ||
413 | This function is a cancellation point and therefore not marked with | |
414 | __THROW. */ | |
415 | extern int pause (void); | |
28f540f4 RM |
416 | |
417 | ||
418 | /* Change the owner and group of FILE. */ | |
c1422e5b | 419 | extern int chown (__const char *__file, __uid_t __owner, __gid_t __group) |
0476597b | 420 | __THROW __nonnull ((1)) __wur; |
28f540f4 | 421 | |
0d8733c4 | 422 | #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED |
28f540f4 | 423 | /* Change the owner and group of the file that FD is open on. */ |
0476597b | 424 | extern int fchown (int __fd, __uid_t __owner, __gid_t __group) __THROW __wur; |
2c6fe0bd UD |
425 | |
426 | ||
427 | /* Change owner and group of FILE, if it is a symbolic | |
428 | link the ownership of the symbolic link is changed. */ | |
c1422e5b | 429 | extern int lchown (__const char *__file, __uid_t __owner, __gid_t __group) |
0476597b | 430 | __THROW __nonnull ((1)) __wur; |
2c6fe0bd UD |
431 | |
432 | #endif /* Use BSD || X/Open Unix. */ | |
28f540f4 RM |
433 | |
434 | /* Change the process's working directory to PATH. */ | |
0476597b | 435 | extern int chdir (__const char *__path) __THROW __nonnull ((1)) __wur; |
28f540f4 | 436 | |
0d8733c4 | 437 | #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED |
28f540f4 | 438 | /* Change the process's working directory to the one FD is open on. */ |
0476597b | 439 | extern int fchdir (int __fd) __THROW __wur; |
28f540f4 RM |
440 | #endif |
441 | ||
442 | /* Get the pathname of the current working directory, | |
443 | and put it in SIZE bytes of BUF. Returns NULL if the | |
444 | directory couldn't be determined or SIZE was too small. | |
445 | If successful, returns BUF. In GNU, if BUF is NULL, | |
446 | an array is allocated with `malloc'; the array is SIZE | |
714a562f | 447 | bytes long, unless SIZE == 0, in which case it is as |
28f540f4 | 448 | big as necessary. */ |
0476597b | 449 | extern char *getcwd (char *__buf, size_t __size) __THROW __wur; |
28f540f4 RM |
450 | |
451 | #ifdef __USE_GNU | |
452 | /* Return a malloc'd string containing the current directory name. | |
453 | If the environment variable `PWD' is set, and its value is correct, | |
454 | that value is used. */ | |
c1422e5b | 455 | extern char *get_current_dir_name (void) __THROW; |
28f540f4 RM |
456 | #endif |
457 | ||
0d8733c4 | 458 | #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED |
28f540f4 RM |
459 | /* Put the absolute pathname of the current working directory in BUF. |
460 | If successful, return BUF. If not, put an error message in | |
461 | BUF and return NULL. BUF should be at least PATH_MAX bytes long. */ | |
0476597b UD |
462 | extern char *getwd (char *__buf) |
463 | __THROW __nonnull ((1)) __attribute_deprecated__ __wur; | |
28f540f4 RM |
464 | #endif |
465 | ||
466 | ||
467 | /* Duplicate FD, returning a new file descriptor on the same file. */ | |
0476597b | 468 | extern int dup (int __fd) __THROW __wur; |
28f540f4 RM |
469 | |
470 | /* Duplicate FD to FD2, closing FD2 and making it open on the same file. */ | |
e2070ca2 | 471 | extern int dup2 (int __fd, int __fd2) __THROW; |
28f540f4 RM |
472 | |
473 | /* NULL-terminated array of "NAME=VALUE" environment variables. */ | |
474 | extern char **__environ; | |
df4ef2ab UD |
475 | #ifdef __USE_GNU |
476 | extern char **environ; | |
477 | #endif | |
28f540f4 RM |
478 | |
479 | ||
480 | /* Replace the current process, executing PATH with arguments ARGV and | |
481 | environment ENVP. ARGV and ENVP are terminated by NULL pointers. */ | |
c1422e5b | 482 | extern int execve (__const char *__path, char *__const __argv[], |
8a1f658b | 483 | char *__const __envp[]) __THROW __nonnull ((1)); |
28f540f4 RM |
484 | |
485 | #ifdef __USE_GNU | |
486 | /* Execute the file FD refers to, overlaying the running program image. | |
487 | ARGV and ENVP are passed to the new program, as for `execve'. */ | |
c1422e5b UD |
488 | extern int fexecve (int __fd, char *__const __argv[], char *__const __envp[]) |
489 | __THROW; | |
28f540f4 RM |
490 | #endif |
491 | ||
492 | ||
493 | /* Execute PATH with arguments ARGV and environment from `environ'. */ | |
8a1f658b UD |
494 | extern int execv (__const char *__path, char *__const __argv[]) |
495 | __THROW __nonnull ((1)); | |
28f540f4 RM |
496 | |
497 | /* Execute PATH with all arguments after PATH until a NULL pointer, | |
498 | and the argument after that for environment. */ | |
8a1f658b UD |
499 | extern int execle (__const char *__path, __const char *__arg, ...) |
500 | __THROW __nonnull ((1)); | |
28f540f4 RM |
501 | |
502 | /* Execute PATH with all arguments after PATH until | |
503 | a NULL pointer and environment from `environ'. */ | |
8a1f658b UD |
504 | extern int execl (__const char *__path, __const char *__arg, ...) |
505 | __THROW __nonnull ((1)); | |
28f540f4 RM |
506 | |
507 | /* Execute FILE, searching in the `PATH' environment variable if it contains | |
508 | no slashes, with arguments ARGV and environment from `environ'. */ | |
8a1f658b UD |
509 | extern int execvp (__const char *__file, char *__const __argv[]) |
510 | __THROW __nonnull ((1)); | |
28f540f4 RM |
511 | |
512 | /* Execute FILE, searching in the `PATH' environment variable if | |
513 | it contains no slashes, with all arguments after FILE until a | |
514 | NULL pointer and environment from `environ'. */ | |
8a1f658b UD |
515 | extern int execlp (__const char *__file, __const char *__arg, ...) |
516 | __THROW __nonnull ((1)); | |
28f540f4 RM |
517 | |
518 | ||
0d8733c4 | 519 | #if defined __USE_MISC || defined __USE_XOPEN |
a3e59be8 | 520 | /* Add INC to priority of the current process. */ |
0476597b | 521 | extern int nice (int __inc) __THROW __wur; |
a3e59be8 UD |
522 | #endif |
523 | ||
524 | ||
28f540f4 | 525 | /* Terminate program execution with the low-order 8 bits of STATUS. */ |
c1422e5b | 526 | extern void _exit (int __status) __attribute__ ((__noreturn__)); |
28f540f4 RM |
527 | |
528 | ||
529 | /* Get the `_PC_*' symbols for the NAME argument to `pathconf' and `fpathconf'; | |
530 | the `_SC_*' symbols for the NAME argument to `sysconf'; | |
531 | and the `_CS_*' symbols for the NAME argument to `confstr'. */ | |
5107cf1d | 532 | #include <bits/confname.h> |
28f540f4 RM |
533 | |
534 | /* Get file-specific configuration information about PATH. */ | |
8a1f658b UD |
535 | extern long int pathconf (__const char *__path, int __name) |
536 | __THROW __nonnull ((1)); | |
28f540f4 RM |
537 | |
538 | /* Get file-specific configuration about descriptor FD. */ | |
966f66bb | 539 | extern long int fpathconf (int __fd, int __name) __THROW; |
28f540f4 RM |
540 | |
541 | /* Get the value of the system variable NAME. */ | |
966f66bb | 542 | extern long int sysconf (int __name) __THROW __attribute__ ((__const__)); |
28f540f4 RM |
543 | |
544 | #ifdef __USE_POSIX2 | |
545 | /* Get the value of the string-valued system variable NAME. */ | |
c1422e5b | 546 | extern size_t confstr (int __name, char *__buf, size_t __len) __THROW; |
28f540f4 RM |
547 | #endif |
548 | ||
549 | ||
550 | /* Get the process ID of the calling process. */ | |
c1422e5b | 551 | extern __pid_t getpid (void) __THROW; |
28f540f4 RM |
552 | |
553 | /* Get the process ID of the calling process's parent. */ | |
c1422e5b | 554 | extern __pid_t getppid (void) __THROW; |
28f540f4 | 555 | |
01cad722 UD |
556 | /* Get the process group ID of the calling process. |
557 | This function is different on old BSD. */ | |
558 | #ifndef __FAVOR_BSD | |
c1422e5b | 559 | extern __pid_t getpgrp (void) __THROW; |
01cad722 | 560 | #else |
f377d022 UD |
561 | # ifdef __REDIRECT_NTH |
562 | extern __pid_t __REDIRECT_NTH (getpgrp, (__pid_t __pid), __getpgid); | |
01cad722 UD |
563 | # else |
564 | # define getpgrp __getpgid | |
565 | # endif | |
0d8733c4 | 566 | #endif |
28f540f4 | 567 | |
28f540f4 | 568 | /* Get the process group ID of process PID. */ |
c1422e5b | 569 | extern __pid_t __getpgid (__pid_t __pid) __THROW; |
2c6fe0bd | 570 | #ifdef __USE_XOPEN_EXTENDED |
c1422e5b | 571 | extern __pid_t getpgid (__pid_t __pid) __THROW; |
28f540f4 RM |
572 | #endif |
573 | ||
01cad722 UD |
574 | |
575 | /* Set the process group ID of the process matching PID to PGID. | |
576 | If PID is zero, the current process's process group ID is set. | |
577 | If PGID is zero, the process ID of the process is used. */ | |
c1422e5b | 578 | extern int setpgid (__pid_t __pid, __pid_t __pgid) __THROW; |
01cad722 | 579 | |
0d8733c4 | 580 | #if defined __USE_SVID || defined __USE_BSD || defined __USE_XOPEN_EXTENDED |
b20e47cb RM |
581 | /* Both System V and BSD have `setpgrp' functions, but with different |
582 | calling conventions. The BSD function is the same as POSIX.1 `setpgid' | |
583 | (above). The System V function takes no arguments and puts the calling | |
584 | process in its on group like `setpgid (0, 0)'. | |
585 | ||
586 | New programs should always use `setpgid' instead. | |
587 | ||
588 | The default in GNU is to provide the System V function. The BSD | |
01cad722 | 589 | function is available under -D_BSD_SOURCE. */ |
b20e47cb | 590 | |
dfd2257a | 591 | # ifndef __FAVOR_BSD |
b20e47cb RM |
592 | |
593 | /* Set the process group ID of the calling process to its own PID. | |
594 | This is exactly the same as `setpgid (0, 0)'. */ | |
c1422e5b | 595 | extern int setpgrp (void) __THROW; |
b20e47cb | 596 | |
dfd2257a | 597 | # else |
b20e47cb RM |
598 | |
599 | /* Another name for `setpgid' (above). */ | |
f377d022 UD |
600 | # ifdef __REDIRECT_NTH |
601 | extern int __REDIRECT_NTH (setpgrp, (__pid_t __pid, __pid_t __pgrp), setpgid); | |
01cad722 UD |
602 | # else |
603 | # define setpgrp setpgid | |
604 | # endif | |
b20e47cb | 605 | |
dfd2257a | 606 | # endif /* Favor BSD. */ |
b20e47cb | 607 | #endif /* Use SVID or BSD. */ |
28f540f4 RM |
608 | |
609 | /* Create a new session with the calling process as its leader. | |
610 | The process group IDs of the session and the calling process | |
611 | are set to the process ID of the calling process, which is returned. */ | |
c1422e5b | 612 | extern __pid_t setsid (void) __THROW; |
28f540f4 | 613 | |
2c6fe0bd | 614 | #ifdef __USE_XOPEN_EXTENDED |
b7843ea9 | 615 | /* Return the session ID of the given process. */ |
c1422e5b | 616 | extern __pid_t getsid (__pid_t __pid) __THROW; |
b7843ea9 RM |
617 | #endif |
618 | ||
28f540f4 | 619 | /* Get the real user ID of the calling process. */ |
c1422e5b | 620 | extern __uid_t getuid (void) __THROW; |
28f540f4 RM |
621 | |
622 | /* Get the effective user ID of the calling process. */ | |
c1422e5b | 623 | extern __uid_t geteuid (void) __THROW; |
28f540f4 RM |
624 | |
625 | /* Get the real group ID of the calling process. */ | |
c1422e5b | 626 | extern __gid_t getgid (void) __THROW; |
28f540f4 RM |
627 | |
628 | /* Get the effective group ID of the calling process. */ | |
c1422e5b | 629 | extern __gid_t getegid (void) __THROW; |
28f540f4 RM |
630 | |
631 | /* If SIZE is zero, return the number of supplementary groups | |
632 | the calling process is in. Otherwise, fill in the group IDs | |
633 | of its supplementary groups in LIST and return the number written. */ | |
0476597b | 634 | extern int getgroups (int __size, __gid_t __list[]) __THROW __wur; |
28f540f4 | 635 | |
3bbceb12 RM |
636 | #ifdef __USE_GNU |
637 | /* Return nonzero iff the calling process is in group GID. */ | |
c1422e5b | 638 | extern int group_member (__gid_t __gid) __THROW; |
3bbceb12 RM |
639 | #endif |
640 | ||
28f540f4 RM |
641 | /* Set the user ID of the calling process to UID. |
642 | If the calling process is the super-user, set the real | |
643 | and effective user IDs, and the saved set-user-ID to UID; | |
644 | if not, the effective user ID is set to UID. */ | |
c1422e5b | 645 | extern int setuid (__uid_t __uid) __THROW; |
28f540f4 | 646 | |
0d8733c4 | 647 | #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED |
28f540f4 RM |
648 | /* Set the real user ID of the calling process to RUID, |
649 | and the effective user ID of the calling process to EUID. */ | |
c1422e5b | 650 | extern int setreuid (__uid_t __ruid, __uid_t __euid) __THROW; |
2c6fe0bd | 651 | #endif |
28f540f4 | 652 | |
49833554 | 653 | #if defined __USE_BSD || defined __USE_XOPEN2K |
28f540f4 | 654 | /* Set the effective user ID of the calling process to UID. */ |
c1422e5b | 655 | extern int seteuid (__uid_t __uid) __THROW; |
28f540f4 RM |
656 | #endif /* Use BSD. */ |
657 | ||
658 | /* Set the group ID of the calling process to GID. | |
659 | If the calling process is the super-user, set the real | |
660 | and effective group IDs, and the saved set-group-ID to GID; | |
661 | if not, the effective group ID is set to GID. */ | |
c1422e5b | 662 | extern int setgid (__gid_t __gid) __THROW; |
28f540f4 | 663 | |
0d8733c4 | 664 | #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED |
28f540f4 RM |
665 | /* Set the real group ID of the calling process to RGID, |
666 | and the effective group ID of the calling process to EGID. */ | |
c1422e5b | 667 | extern int setregid (__gid_t __rgid, __gid_t __egid) __THROW; |
2c6fe0bd | 668 | #endif |
28f540f4 | 669 | |
49833554 | 670 | #if defined __USE_BSD || defined __USE_XOPEN2K |
28f540f4 | 671 | /* Set the effective group ID of the calling process to GID. */ |
c1422e5b | 672 | extern int setegid (__gid_t __gid) __THROW; |
28f540f4 RM |
673 | #endif /* Use BSD. */ |
674 | ||
747bf98e | 675 | #ifdef __USE_GNU |
a334319f | 676 | /* Fetch the effective user ID, real user ID, and saved-set user ID, |
747bf98e | 677 | of the calling process. */ |
0476597b UD |
678 | extern int getresuid (__uid_t *__euid, __uid_t *__ruid, __uid_t *__suid) |
679 | __THROW; | |
747bf98e | 680 | |
a334319f | 681 | /* Fetch the effective group ID, real group ID, and saved-set group ID, |
747bf98e | 682 | of the calling process. */ |
0476597b UD |
683 | extern int getresgid (__gid_t *__egid, __gid_t *__rgid, __gid_t *__sgid) |
684 | __THROW; | |
747bf98e | 685 | |
a334319f UD |
686 | /* Set the effective user ID, real user ID, and saved-set user ID, |
687 | of the calling process to EUID, RUID, and SUID, respectively. */ | |
0476597b UD |
688 | extern int setresuid (__uid_t __euid, __uid_t __ruid, __uid_t __suid) |
689 | __THROW; | |
747bf98e | 690 | |
a334319f UD |
691 | /* Set the effective group ID, real group ID, and saved-set group ID, |
692 | of the calling process to EGID, RGID, and SGID, respectively. */ | |
0476597b UD |
693 | extern int setresgid (__gid_t __egid, __gid_t __rgid, __gid_t __sgid) |
694 | __THROW; | |
747bf98e RM |
695 | #endif |
696 | ||
28f540f4 RM |
697 | |
698 | /* Clone the calling process, creating an exact copy. | |
699 | Return -1 for errors, 0 to the new process, | |
700 | and the process ID of the new process to the old process. */ | |
c1422e5b | 701 | extern __pid_t fork (void) __THROW; |
28f540f4 | 702 | |
0d8733c4 | 703 | #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED |
28f540f4 | 704 | /* Clone the calling process, but without copying the whole address space. |
05fdf2df | 705 | The calling process is suspended until the new process exits or is |
28f540f4 RM |
706 | replaced by a call to `execve'. Return -1 for errors, 0 to the new process, |
707 | and the process ID of the new process to the old process. */ | |
c1422e5b | 708 | extern __pid_t vfork (void) __THROW; |
28f540f4 RM |
709 | #endif /* Use BSD. */ |
710 | ||
711 | ||
712 | /* Return the pathname of the terminal FD is open on, or NULL on errors. | |
73299943 UD |
713 | The returned storage is good only until the next call to this function. */ |
714 | extern char *ttyname (int __fd) __THROW; | |
9d187dd4 | 715 | |
60478656 | 716 | /* Store at most BUFLEN characters of the pathname of the terminal FD is |
73299943 | 717 | open on in BUF. Return 0 on success, otherwise an error number. */ |
8a1f658b | 718 | extern int ttyname_r (int __fd, char *__buf, size_t __buflen) |
0476597b | 719 | __THROW __nonnull ((2)) __wur; |
28f540f4 RM |
720 | |
721 | /* Return 1 if FD is a valid descriptor associated | |
722 | with a terminal, zero if not. */ | |
c1422e5b | 723 | extern int isatty (int __fd) __THROW; |
28f540f4 | 724 | |
d921b304 UD |
725 | #if defined __USE_BSD \ |
726 | || (defined __USE_XOPEN_EXTENDED && !defined __USE_UNIX98) | |
1474b80f | 727 | /* Return the index into the active-logins file (utmp) for |
a9df8829 | 728 | the controlling terminal. */ |
c1422e5b | 729 | extern int ttyslot (void) __THROW; |
1474b80f RM |
730 | #endif |
731 | ||
28f540f4 RM |
732 | |
733 | /* Make a link to FROM named TO. */ | |
8a1f658b | 734 | extern int link (__const char *__from, __const char *__to) |
0476597b | 735 | __THROW __nonnull ((1, 2)) __wur; |
28f540f4 | 736 | |
f2b0dc44 | 737 | #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K |
28f540f4 | 738 | /* Make a symbolic link to FROM named TO. */ |
8a1f658b | 739 | extern int symlink (__const char *__from, __const char *__to) |
0476597b | 740 | __THROW __nonnull ((1, 2)) __wur; |
28f540f4 RM |
741 | |
742 | /* Read the contents of the symbolic link PATH into no more than | |
743 | LEN bytes of BUF. The contents are not null-terminated. | |
744 | Returns the number of characters read, or -1 for errors. */ | |
a334319f | 745 | extern int readlink (__const char *__restrict __path, char *__restrict __buf, |
0476597b | 746 | size_t __len) __THROW __nonnull ((1, 2)) __wur; |
28f540f4 RM |
747 | #endif /* Use BSD. */ |
748 | ||
749 | /* Remove the link NAME. */ | |
8a1f658b | 750 | extern int unlink (__const char *__name) __THROW __nonnull ((1)); |
28f540f4 RM |
751 | |
752 | /* Remove the directory PATH. */ | |
8a1f658b | 753 | extern int rmdir (__const char *__path) __THROW __nonnull ((1)); |
28f540f4 RM |
754 | |
755 | ||
756 | /* Return the foreground process group ID of FD. */ | |
c1422e5b | 757 | extern __pid_t tcgetpgrp (int __fd) __THROW; |
28f540f4 RM |
758 | |
759 | /* Set the foreground process group ID of FD set PGRP_ID. */ | |
c1422e5b | 760 | extern int tcsetpgrp (int __fd, __pid_t __pgrp_id) __THROW; |
28f540f4 RM |
761 | |
762 | ||
2c008571 UD |
763 | /* Return the login name of the user. |
764 | ||
765 | This function is a possible cancellation points and therefore not | |
766 | marked with __THROW. */ | |
767 | extern char *getlogin (void); | |
a334319f | 768 | #if defined __USE_REENTRANT || defined __USE_UNIX98 |
ee188d55 | 769 | /* Return at most NAME_LEN characters of the login name of the user in NAME. |
6d52618b | 770 | If it cannot be determined or some other error occurred, return the error |
2c008571 UD |
771 | code. Otherwise return 0. |
772 | ||
773 | This function is a possible cancellation points and therefore not | |
774 | marked with __THROW. */ | |
8a1f658b | 775 | extern int getlogin_r (char *__name, size_t __name_len) __nonnull ((1)); |
ee188d55 | 776 | #endif |
28f540f4 RM |
777 | |
778 | #ifdef __USE_BSD | |
779 | /* Set the login name returned by `getlogin'. */ | |
8a1f658b | 780 | extern int setlogin (__const char *__name) __THROW __nonnull ((1)); |
28f540f4 RM |
781 | #endif |
782 | ||
783 | ||
784 | #ifdef __USE_POSIX2 | |
a379e56a UD |
785 | /* Get definitions and prototypes for functions to process the |
786 | arguments in ARGV (ARGC of them, minus the program name) for | |
787 | options given in OPTS. */ | |
788 | # define __need_getopt | |
789 | # include <getopt.h> | |
28f540f4 RM |
790 | #endif |
791 | ||
792 | ||
58e52042 | 793 | #if defined __USE_BSD || defined __USE_UNIX98 |
28f540f4 RM |
794 | /* Put the name of the current host in no more than LEN bytes of NAME. |
795 | The result is null-terminated if LEN is large enough for the full | |
796 | name and the terminator. */ | |
8a1f658b | 797 | extern int gethostname (char *__name, size_t __len) __THROW __nonnull ((1)); |
639c3248 | 798 | #endif |
28f540f4 | 799 | |
639c3248 UD |
800 | |
801 | #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98) | |
28f540f4 RM |
802 | /* Set the name of the current host to NAME, which is LEN bytes long. |
803 | This call is restricted to the super-user. */ | |
8a1f658b | 804 | extern int sethostname (__const char *__name, size_t __len) |
0476597b | 805 | __THROW __nonnull ((1)) __wur; |
28f540f4 | 806 | |
28f540f4 RM |
807 | /* Set the current machine's Internet number to ID. |
808 | This call is restricted to the super-user. */ | |
0476597b | 809 | extern int sethostid (long int __id) __THROW __wur; |
28f540f4 RM |
810 | |
811 | ||
f5348425 RM |
812 | /* Get and set the NIS (aka YP) domain name, if any. |
813 | Called just like `gethostname' and `sethostname'. | |
814 | The NIS domain name is usually the empty string when not using NIS. */ | |
8a1f658b | 815 | extern int getdomainname (char *__name, size_t __len) |
0476597b | 816 | __THROW __nonnull ((1)) __wur; |
8a1f658b | 817 | extern int setdomainname (__const char *__name, size_t __len) |
0476597b | 818 | __THROW __nonnull ((1)) __wur; |
f5348425 RM |
819 | |
820 | ||
28f540f4 RM |
821 | /* Revoke access permissions to all processes currently communicating |
822 | with the control terminal, and then send a SIGHUP signal to the process | |
823 | group of the control terminal. */ | |
c1422e5b | 824 | extern int vhangup (void) __THROW; |
28f540f4 | 825 | |
342414a6 | 826 | /* Revoke the access of all descriptors currently open on FILE. */ |
0476597b | 827 | extern int revoke (__const char *__file) __THROW __nonnull ((1)) __wur; |
342414a6 | 828 | |
28f540f4 | 829 | |
ea03559a RM |
830 | /* Enable statistical profiling, writing samples of the PC into at most |
831 | SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling | |
832 | is enabled, the system examines the user PC and increments | |
833 | SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536]. If SCALE is zero, | |
834 | disable profiling. Returns zero on success, -1 on error. */ | |
c1422e5b | 835 | extern int profil (unsigned short int *__sample_buffer, size_t __size, |
8a1f658b UD |
836 | size_t __offset, unsigned int __scale) |
837 | __THROW __nonnull ((1)); | |
ea03559a RM |
838 | |
839 | ||
28f540f4 RM |
840 | /* Turn accounting on if NAME is an existing file. The system will then write |
841 | a record for each process as it terminates, to this file. If NAME is NULL, | |
842 | turn accounting off. This call is restricted to the super-user. */ | |
a334319f | 843 | extern int acct (__const char *__name) __THROW __nonnull ((1)); |
28f540f4 | 844 | |
28f540f4 RM |
845 | |
846 | /* Successive calls return the shells listed in `/etc/shells'. */ | |
c1422e5b UD |
847 | extern char *getusershell (void) __THROW; |
848 | extern void endusershell (void) __THROW; /* Discard cached info. */ | |
849 | extern void setusershell (void) __THROW; /* Rewind and re-read the file. */ | |
28f540f4 RM |
850 | |
851 | ||
28f540f4 RM |
852 | /* Put the program in the background, and dissociate from the controlling |
853 | terminal. If NOCHDIR is zero, do `chdir ("/")'. If NOCLOSE is zero, | |
854 | redirects stdin, stdout, and stderr to /dev/null. */ | |
0476597b | 855 | extern int daemon (int __nochdir, int __noclose) __THROW __wur; |
2c6fe0bd | 856 | #endif /* Use BSD || X/Open. */ |
28f540f4 RM |
857 | |
858 | ||
d921b304 UD |
859 | #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_XOPEN2K) |
860 | /* Make PATH be the root directory (the starting point for absolute paths). | |
861 | This call is restricted to the super-user. */ | |
0476597b | 862 | extern int chroot (__const char *__path) __THROW __nonnull ((1)) __wur; |
d921b304 UD |
863 | |
864 | /* Prompt with PROMPT and read a string from the terminal without echoing. | |
865 | Uses /dev/tty if possible; otherwise stderr and stdin. */ | |
8a1f658b | 866 | extern char *getpass (__const char *__prompt) __nonnull ((1)); |
d921b304 UD |
867 | #endif /* Use BSD || X/Open. */ |
868 | ||
869 | ||
870 | #if defined __USE_BSD || defined __USE_XOPEN | |
2c008571 UD |
871 | /* Make all changes done to FD actually appear on disk. |
872 | ||
873 | This function is a cancellation point and therefore not marked with | |
874 | __THROW. */ | |
875 | extern int fsync (int __fd); | |
d921b304 UD |
876 | #endif /* Use BSD || X/Open. */ |
877 | ||
878 | ||
0d8733c4 | 879 | #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED |
2c6fe0bd | 880 | |
ce42435c UD |
881 | /* Return identifier for the current host. */ |
882 | extern long int gethostid (void); | |
28f540f4 | 883 | |
2c6fe0bd | 884 | /* Make all changes done to all files actually appear on disk. */ |
7287c36d | 885 | extern void sync (void) __THROW; |
28f540f4 | 886 | |
28f540f4 | 887 | |
2c6fe0bd UD |
888 | /* Return the number of bytes in a page. This is the system's page size, |
889 | which is not necessarily the same as the hardware page size. */ | |
16f282b8 | 890 | extern int getpagesize (void) __THROW __attribute__ ((__const__)); |
2c6fe0bd UD |
891 | |
892 | ||
f14038f2 UD |
893 | /* Return the maximum number of file descriptors |
894 | the current process could possibly have. */ | |
895 | extern int getdtablesize (void) __THROW; | |
896 | ||
897 | ||
2c6fe0bd | 898 | /* Truncate FILE to LENGTH bytes. */ |
d921b304 | 899 | # ifndef __USE_FILE_OFFSET64 |
8a1f658b | 900 | extern int truncate (__const char *__file, __off_t __length) |
0476597b | 901 | __THROW __nonnull ((1)) __wur; |
d921b304 | 902 | # else |
f377d022 UD |
903 | # ifdef __REDIRECT_NTH |
904 | extern int __REDIRECT_NTH (truncate, | |
905 | (__const char *__file, __off64_t __length), | |
0476597b | 906 | truncate64) __nonnull ((1)) __wur; |
d921b304 UD |
907 | # else |
908 | # define truncate truncate64 | |
909 | # endif | |
01cad722 | 910 | # endif |
d921b304 | 911 | # ifdef __USE_LARGEFILE64 |
8a1f658b | 912 | extern int truncate64 (__const char *__file, __off64_t __length) |
0476597b | 913 | __THROW __nonnull ((1)) __wur; |
d921b304 | 914 | # endif |
2c6fe0bd | 915 | |
f14038f2 UD |
916 | #endif /* Use BSD || X/Open Unix. */ |
917 | ||
918 | #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K | |
919 | ||
2c6fe0bd | 920 | /* Truncate the file FD is open on to LENGTH bytes. */ |
d921b304 | 921 | # ifndef __USE_FILE_OFFSET64 |
0476597b | 922 | extern int ftruncate (int __fd, __off_t __length) __THROW __wur; |
d921b304 | 923 | # else |
f377d022 UD |
924 | # ifdef __REDIRECT_NTH |
925 | extern int __REDIRECT_NTH (ftruncate, (int __fd, __off64_t __length), | |
0476597b | 926 | ftruncate64) __wur; |
d921b304 UD |
927 | # else |
928 | # define ftruncate ftruncate64 | |
929 | # endif | |
01cad722 | 930 | # endif |
d921b304 | 931 | # ifdef __USE_LARGEFILE64 |
0476597b | 932 | extern int ftruncate64 (int __fd, __off64_t __length) __THROW __wur; |
d921b304 | 933 | # endif |
2c6fe0bd | 934 | |
f14038f2 | 935 | #endif /* Use BSD || X/Open Unix || POSIX 2003. */ |
2c6fe0bd UD |
936 | |
937 | ||
0d8733c4 | 938 | #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED |
28f540f4 | 939 | |
196980f5 RM |
940 | /* Set the end of accessible data space (aka "the break") to ADDR. |
941 | Returns zero on success and -1 for errors (with errno set). */ | |
0476597b | 942 | extern int brk (void *__addr) __THROW __wur; |
196980f5 | 943 | |
196980f5 RM |
944 | /* Increase or decrease the end of accessible data space by DELTA bytes. |
945 | If successful, returns the address the previous end of data space | |
946 | (i.e. the beginning of the new space, if DELTA > 0); | |
947 | returns (void *) -1 for errors (with errno set). */ | |
0ed99ce4 | 948 | extern void *sbrk (intptr_t __delta) __THROW; |
2c6fe0bd | 949 | #endif |
196980f5 RM |
950 | |
951 | ||
2c6fe0bd | 952 | #ifdef __USE_MISC |
28f540f4 RM |
953 | /* Invoke `system call' number SYSNO, passing it the remaining arguments. |
954 | This is completely system-dependent, and not often useful. | |
955 | ||
956 | In Unix, `syscall' sets `errno' for all errors and most calls return -1 | |
957 | for errors; in many systems you cannot pass arguments or get return | |
958 | values for all system calls (`pipe', `fork', and `getppid' typically | |
959 | among them). | |
960 | ||
961 | In Mach, all system calls take normal arguments and always return an | |
962 | error code (zero for success). */ | |
c1422e5b | 963 | extern long int syscall (long int __sysno, ...) __THROW; |
28f540f4 RM |
964 | |
965 | #endif /* Use misc. */ | |
966 | ||
967 | ||
0d8733c4 | 968 | #if (defined __USE_MISC || defined __USE_XOPEN_EXTENDED) && !defined F_LOCK |
28f540f4 RM |
969 | /* NOTE: These declarations also appear in <fcntl.h>; be sure to keep both |
970 | files consistent. Some systems have them there and some here, and some | |
971 | software depends on the macros being defined without including both. */ | |
972 | ||
973 | /* `lockf' is a simpler interface to the locking facilities of `fcntl'. | |
974 | LEN is always relative to the current file position. | |
2c008571 UD |
975 | The CMD argument is one of the following. |
976 | ||
977 | This function is a cancellation point and therefore not marked with | |
978 | __THROW. */ | |
28f540f4 | 979 | |
a5a0310d UD |
980 | # define F_ULOCK 0 /* Unlock a previously locked region. */ |
981 | # define F_LOCK 1 /* Lock a region for exclusive use. */ | |
982 | # define F_TLOCK 2 /* Test and lock a region for exclusive use. */ | |
983 | # define F_TEST 3 /* Test a region for other processes locks. */ | |
28f540f4 | 984 | |
dfd2257a | 985 | # ifndef __USE_FILE_OFFSET64 |
0476597b | 986 | extern int lockf (int __fd, int __cmd, __off_t __len) __wur; |
dfd2257a | 987 | # else |
01cad722 | 988 | # ifdef __REDIRECT |
2c008571 | 989 | extern int __REDIRECT (lockf, (int __fd, int __cmd, __off64_t __len), |
0476597b | 990 | lockf64) __wur; |
01cad722 UD |
991 | # else |
992 | # define lockf lockf64 | |
993 | # endif | |
dfd2257a UD |
994 | # endif |
995 | # ifdef __USE_LARGEFILE64 | |
0476597b | 996 | extern int lockf64 (int __fd, int __cmd, __off64_t __len) __wur; |
dfd2257a | 997 | # endif |
28f540f4 RM |
998 | #endif /* Use misc and F_LOCK not already defined. */ |
999 | ||
1000 | ||
1001 | #ifdef __USE_GNU | |
1002 | ||
1003 | /* Evaluate EXPRESSION, and repeat as long as it returns -1 with `errno' | |
1004 | set to EINTR. */ | |
1005 | ||
a5a0310d | 1006 | # define TEMP_FAILURE_RETRY(expression) \ |
036cc82f RM |
1007 | (__extension__ \ |
1008 | ({ long int __result; \ | |
28f540f4 RM |
1009 | do __result = (long int) (expression); \ |
1010 | while (__result == -1L && errno == EINTR); \ | |
06535ae9 | 1011 | __result; })) |
28f540f4 RM |
1012 | #endif |
1013 | ||
a5a0310d | 1014 | #if defined __USE_POSIX199309 || defined __USE_UNIX98 |
7b3547eb RM |
1015 | /* Synchronize at least the data part of a file with the underlying |
1016 | media. */ | |
a334319f | 1017 | extern int fdatasync (int __fildes) __THROW; |
6d52618b | 1018 | #endif /* Use POSIX199309 */ |
7b3547eb | 1019 | |
2c6fe0bd UD |
1020 | |
1021 | /* XPG4.2 specifies that prototypes for the encryption functions must | |
1022 | be defined here. */ | |
1023 | #ifdef __USE_XOPEN | |
1024 | /* Encrypt at most 8 characters from KEY using salt to perturb DES. */ | |
8a1f658b UD |
1025 | extern char *crypt (__const char *__key, __const char *__salt) |
1026 | __THROW __nonnull ((1, 2)); | |
2c6fe0bd | 1027 | |
2c6fe0bd UD |
1028 | /* Encrypt data in BLOCK in place if EDFLAG is zero; otherwise decrypt |
1029 | block in place. */ | |
8a1f658b | 1030 | extern void encrypt (char *__block, int __edflag) __THROW __nonnull ((1)); |
2c6fe0bd UD |
1031 | |
1032 | ||
1033 | /* Swab pairs bytes in the first N bytes of the area pointed to by | |
1034 | FROM and copy the result to TO. The value of TO must not be in the | |
1035 | range [FROM - N + 1, FROM - 1]. If N is odd the first byte in FROM | |
1036 | is without partner. */ | |
98cbe360 | 1037 | extern void swab (__const void *__restrict __from, void *__restrict __to, |
8a1f658b | 1038 | ssize_t __n) __THROW __nonnull ((1, 2)); |
a5a0310d UD |
1039 | #endif |
1040 | ||
1041 | ||
8de72f53 UD |
1042 | /* The Single Unix specification demands this prototype to be here. |
1043 | It is also found in <stdio.h>. */ | |
e918a7fe | 1044 | #ifdef __USE_XOPEN |
a5a0310d | 1045 | /* Return the name of the controlling terminal. */ |
a334319f | 1046 | extern char *ctermid (char *__s) __THROW __nonnull ((1)); |
e918a7fe UD |
1047 | #endif |
1048 | ||
553cc5f9 | 1049 | |
f2b0dc44 UD |
1050 | /* Define some macros helping to catch buffer overflows. */ |
1051 | #if __USE_FORTIFY_LEVEL > 0 && !defined __cplusplus | |
1052 | # include <bits/unistd.h> | |
1053 | #endif | |
1054 | ||
28f540f4 RM |
1055 | __END_DECLS |
1056 | ||
1057 | #endif /* unistd.h */ |