include/unistd.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2014 PALO, Richard.
  24  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
  25  * Copyright (c) 2013 Gary Mills
  26  *
  27  * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
  28  */
  29
  30 /*      Copyright (c) 1988 AT&T */
  31 /*        All Rights Reserved   */
  32
  33 /* Copyright (c) 2013, OmniTI Computer Consulting, Inc. All rights reserved. */
  34
  35 #ifndef _UNISTD_H
  36 #define _UNISTD_H
  37
  38 #include <sys/feature_tests.h>
  39
  40 #include <sys/null.h>
  41 #include <sys/types.h>
  42 #include <sys/unistd.h>
  43
  44 #ifdef  __cplusplus
  45 extern "C" {
  46 #endif
  47
  48 /* Symbolic constants for the "access" routine: */
  49 #define R_OK    4       /* Test for Read permission */
  50 #define W_OK    2       /* Test for Write permission */
  51 #define X_OK    1       /* Test for eXecute permission */
  52 #define F_OK    0       /* Test for existence of File */
  53
  54 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2) || defined(__EXTENSIONS__)
  55 #define F_ULOCK 0       /* Unlock a previously locked region */
  56 #define F_LOCK  1       /* Lock a region for exclusive use */
  57 #define F_TLOCK 2       /* Test and lock a region for exclusive use */
  58 #define F_TEST  3       /* Test a region for other processes locks */
  59 #endif /* !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2)... */
  60
  61 /* Symbolic constants for the "lseek" routine: */
  62
  63 #ifndef SEEK_SET
  64 #define SEEK_SET        0       /* Set file pointer to "offset" */
  65 #endif
  66
  67 #ifndef SEEK_CUR
  68 #define SEEK_CUR        1       /* Set file pointer to current plus "offset" */
  69 #endif
  70
  71 #ifndef SEEK_END
  72 #define SEEK_END        2       /* Set file pointer to EOF plus "offset" */
  73 #endif
  74
  75 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
  76 #ifndef SEEK_DATA
  77 #define SEEK_DATA       3       /* Set file pointer to next data past offset */
  78 #endif
  79
  80 #ifndef SEEK_HOLE
  81 #define SEEK_HOLE       4       /* Set file pointer to next hole past offset */
  82 #endif
  83 #endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */
  84
  85 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
  86 /* Path names: */
  87 #define GF_PATH "/etc/group"    /* Path name of the "group" file */
  88 #define PF_PATH "/etc/passwd"   /* Path name of the "passwd" file */
  89 #endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */
  90
  91 /*
  92  * compile-time symbolic constants,
  93  * Support does not mean the feature is enabled.
  94  * Use pathconf/sysconf to obtain actual configuration value.
  95  */
  96
  97 /* Values unchanged in UNIX 03 */
  98 #define _POSIX_ASYNC_IO                 1
  99 #define _POSIX_JOB_CONTROL              1
 100 #define _POSIX_SAVED_IDS                1
 101 #define _POSIX_SYNC_IO                  1
 102
 103 /*
 104  * POSIX.1b compile-time symbolic constants.
 105  */
 106 #if defined(_XPG6)
 107 #define _POSIX_ASYNCHRONOUS_IO          200112L
 108 #define _POSIX_FSYNC                    200112L
 109 #define _POSIX_MAPPED_FILES             200112L
 110 #define _POSIX_MEMLOCK                  200112L
 111 #define _POSIX_MEMLOCK_RANGE            200112L
 112 #define _POSIX_MEMORY_PROTECTION        200112L
 113 #define _POSIX_MESSAGE_PASSING          200112L
 114 #define _POSIX_PRIORITY_SCHEDULING      200112L
 115 #define _POSIX_REALTIME_SIGNALS         200112L
 116 #define _POSIX_SEMAPHORES               200112L
 117 #define _POSIX_SHARED_MEMORY_OBJECTS    200112L
 118 #define _POSIX_SYNCHRONIZED_IO          200112L
 119 #else
 120 #define _POSIX_ASYNCHRONOUS_IO          1
 121 #define _POSIX_FSYNC                    1
 122 #define _POSIX_MAPPED_FILES             1
 123 #define _POSIX_MEMLOCK                  1
 124 #define _POSIX_MEMLOCK_RANGE            1
 125 #define _POSIX_MEMORY_PROTECTION        1
 126 #define _POSIX_MESSAGE_PASSING          1
 127 #define _POSIX_PRIORITY_SCHEDULING      1
 128 #define _POSIX_REALTIME_SIGNALS         1
 129 #define _POSIX_SEMAPHORES               1
 130 #define _POSIX_SHARED_MEMORY_OBJECTS    1
 131 #define _POSIX_SYNCHRONIZED_IO          1
 132 #endif
 133
 134 /*
 135  * POSIX.1c compile-time symbolic constants.
 136  */
 137 #if defined(_XPG6)
 138 #define _POSIX_THREAD_SAFE_FUNCTIONS            200112L
 139 #define _POSIX_THREADS                          200112L
 140 #define _POSIX_THREAD_ATTR_STACKADDR            200112L
 141 #define _POSIX_THREAD_ATTR_STACKSIZE            200112L
 142 #define _POSIX_THREAD_PROCESS_SHARED            200112L
 143 #define _POSIX_THREAD_PRIORITY_SCHEDULING       200112L
 144 #define _POSIX_TIMERS                           200112L
 145 #else
 146 #define _POSIX_THREAD_SAFE_FUNCTIONS            1
 147 #define _POSIX_THREADS                          1
 148 #define _POSIX_THREAD_ATTR_STACKADDR            1
 149 #define _POSIX_THREAD_ATTR_STACKSIZE            1
 150 #define _POSIX_THREAD_PROCESS_SHARED            1
 151 #define _POSIX_THREAD_PRIORITY_SCHEDULING       1
 152 #define _POSIX_TIMERS                           1
 153 #endif
 154
 155 /* New in UNIX 03 */
 156 #define _POSIX_ADVISORY_INFO                    200112L
 157 #define _POSIX_BARRIERS                         200112L
 158 #define _POSIX_CLOCK_SELECTION                  200112L
 159 #define _POSIX_IPV6                             200112L
 160 #define _POSIX_MONOTONIC_CLOCK                  200112L
 161 #define _POSIX_RAW_SOCKETS                      200112L
 162 #define _POSIX_READER_WRITER_LOCKS              200112L
 163 #define _POSIX_SPAWN                            200112L
 164 #define _POSIX_SPIN_LOCKS                       200112L
 165 #define _POSIX_TIMEOUTS                         200112L
 166
 167 /*
 168  * Support for the POSIX.1 mutex protocol attribute. For realtime applications
 169  * which need mutexes to support priority inheritance/ceiling.
 170  */
 171 #if defined(_XPG6)
 172 #define _POSIX_THREAD_PRIO_INHERIT              200112L
 173 #define _POSIX_THREAD_PRIO_PROTECT              200112L
 174 #else
 175 #define _POSIX_THREAD_PRIO_INHERIT              1
 176 #define _POSIX_THREAD_PRIO_PROTECT              1
 177 #endif
 178
 179 #ifndef _POSIX_VDISABLE
 180 #define _POSIX_VDISABLE         0
 181 #endif
 182
 183 #define STDIN_FILENO    0
 184 #define STDOUT_FILENO   1
 185 #define STDERR_FILENO   2
 186
 187 extern int access(const char *, int);
 188 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 189 extern int acct(const char *);
 190 #endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */
 191 extern unsigned alarm(unsigned);
 192 /* Marked as LEGACY in SUSv2 and removed in SUSv3 */
 193 #if !defined(__XOPEN_OR_POSIX) || (defined(_XPG4_2) && !defined(_XPG6)) || \
 194         defined(__EXTENSIONS__)
 195 extern int brk(void *);
 196 #endif /* !defined(__XOPEN_OR_POSIX) || (defined(_XPG4_2)... */
 197 extern int chdir(const char *);
 198 extern int chown(const char *, uid_t, gid_t);
 199 /* Marked as LEGACY in SUSv2 and removed in SUSv3 */
 200 #if !defined(_POSIX_C_SOURCE) || (defined(_XOPEN_SOURCE) && \
 201         !defined(_XPG6)) || defined(__EXTENSIONS__)
 202 extern int chroot(const char *);
 203 #endif /* !defined(_POSIX_C_SOURCE) || defined(_XOPEN_SOURCE))... */
 204 extern int close(int);
 205 #if defined(_XPG4) || defined(__EXTENSIONS__)
 206 extern size_t confstr(int, char *, size_t);
 207 extern char *crypt(const char *, const char *);
 208 #endif /* defined(_XPG4) || defined(__EXTENSIONS__) */
 209 #if !defined(_POSIX_C_SOURCE) || defined(_XOPEN_SOURCE) || \
 210         defined(__EXTENSIONS__)
 211 extern char *ctermid(char *);
 212 #endif /* (!defined(_POSIX_C_SOURCE) ... */
 213 extern char *ctermid_r(char *);
 214 /* Marked as LEGACY in SUSv2 and removed in SUSv3 */
 215 #if !defined(_XPG6) || defined(__EXTENSIONS__)
 216 extern char *cuserid(char *);
 217 #endif
 218 extern int dup(int);
 219 extern int dup2(int, int);
 220 extern int dup3(int, int, int);
 221 #if defined(_XPG4) || defined(__EXTENSIONS__)
 222 extern void encrypt(char *, int);
 223 #endif /* defined(XPG4) || defined(__EXTENSIONS__) */
 224 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 225 extern void endusershell(void);
 226 #endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */
 227 extern int execl(const char *, const char *, ...);
 228 extern int execle(const char *, const char *, ...);
 229 extern int execlp(const char *, const char *, ...);
 230 extern int execv(const char *, char *const *);
 231 extern int execve(const char *, char *const *, char *const *);
 232 extern int execvp(const char *, char *const *);
 233 #if defined(_GNU_SOURCE) || defined(__EXTENSIONS__)
 234 extern int execvpe(const char *, char *const *, char *const *);
 235 #endif
 236 extern void _exit(int)
 237         __NORETURN;
 238 /*
 239  * The following fattach prototype is duplicated in <stropts.h>. The
 240  * duplication is necessitated by XPG4.2 which requires the prototype
 241  * be defined in <stropts.h>.
 242  */
 243 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 244 extern int fattach(int, const char *);
 245 #endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */
 246 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2) || defined(__EXTENSIONS__)
 247 extern int fchdir(int);
 248 extern int fchown(int, uid_t, gid_t);
 249 #endif /* !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2)... */
 250 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 251 extern int fchroot(int);
 252 #endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */
 253 #if !defined(__XOPEN_OR_POSIX) || (_POSIX_C_SOURCE > 2) || \
 254         defined(__EXTENSIONS__)
 255 extern int fdatasync(int);
 256 #endif /* !defined(__XOPEN_OR_POSIX) || (_POSIX_C_SOURCE > 2)... */
 257 /*
 258  * The following fdetach prototype is duplicated in <stropts.h>. The
 259  * duplication is necessitated by XPG4.2 which requires the prototype
 260  * be defined in <stropts.h>.
 261  */
 262 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 263 extern int fdetach(const char *);
 264 #endif /* !defined(__XOPEN_OR_POSIX)... */
 265 extern pid_t fork(void);
 266 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 267 extern pid_t fork1(void);
 268 extern pid_t forkall(void);
 269 #endif /* !defined(__XOPEN_OR_POSIX)... */
 270 extern long fpathconf(int, int);
 271 #if !defined(_POSIX_C_SOURCE) || (_POSIX_C_SOURCE > 2) || \
 272         defined(__EXTENSIONS__)
 273 extern int fsync(int);
 274 #endif /* !defined(_POSIX_C_SOURCE) || (_POSIX_C_SOURCE > 2)... */
 275 extern int ftruncate(int, off_t);
 276 extern char *getcwd(char *, size_t);
 277 #if !defined(__XOPEN_OR_POSIX) || (defined(_XPG4_2) && !defined(_XPG6)) || \
 278         defined(__EXTENSIONS__)
 279 extern int getdtablesize(void);
 280 #endif
 281 extern gid_t getegid(void);
 282 extern uid_t geteuid(void);
 283 extern gid_t getgid(void);
 284 extern int getgroups(int, gid_t *);
 285 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2) || defined(__EXTENSIONS__)
 286 extern long gethostid(void);
 287 #endif
 288 extern int gethostname(char *, size_t);
 289
 290 #ifndef __GETLOGIN_DEFINED      /* Avoid duplicate in stdlib.h */
 291 extern char *getlogin(void);
 292 #endif  /* __GETLOGIN_DEFINED */
 293
 294 #if defined(_XPG4) || defined(__EXTENSIONS__)
 295 extern int  getopt(int, char *const *, const char *);
 296 extern char *optarg;
 297 extern int  opterr, optind, optopt;
 298 /* Marked as LEGACY in SUSv2 and removed in SUSv3 */
 299 #if !defined(_XPG6) || defined(__EXTENSIONS__)
 300 extern char *getpass(const char *);
 301 #endif
 302 #endif /* defined(_XPG4) || defined(__EXTENSIONS__) */
 303 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2) || defined(__EXTENSIONS__)
 304 /* Marked as LEGACY in SUSv2 and removed in SUSv3 */
 305 #if !defined(_XPG6) || defined(__EXTENSIONS__)
 306 extern int getpagesize(void);
 307 #endif
 308 extern pid_t getpgid(pid_t);
 309 #endif /* !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2)... */
 310 extern pid_t getpid(void);
 311 extern pid_t getppid(void);
 312 extern pid_t getpgrp(void);
 313
 314 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 315 char *gettxt(const char *, const char *);
 316 #endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */
 317 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2) || defined(__EXTENSIONS__)
 318 extern pid_t getsid(pid_t);
 319 #endif /* !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2)... */
 320 extern uid_t getuid(void);
 321 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 322 extern char *getusershell(void);
 323 #endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */
 324 /*
 325  * The following ioctl prototype is duplicated in <stropts.h>. The
 326  * duplication is necessitated by XPG4.2 which requires the prototype
 327  * be defined in <stropts.h>.
 328  */
 329 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 330 extern int ioctl(int, int, ...);
 331 extern int isaexec(const char *, char *const *, char *const *);
 332 extern int issetugid(void);
 333 #endif
 334 extern int isatty(int);
 335 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2) || defined(__EXTENSIONS__)
 336 extern int lchown(const char *, uid_t, gid_t);
 337 #endif
 338 extern int link(const char *, const char *);
 339 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 340 extern offset_t llseek(int, offset_t, int);
 341 #endif
 342 extern int lockf(int, int, off_t);
 343 extern off_t lseek(int, off_t, int);
 344 #if !defined(_POSIX_C_SOURCE) || defined(_XOPEN_SOURCE) || \
 345         defined(__EXTENSIONS__)
 346 extern int nice(int);
 347 #endif /* !defined(_POSIX_C_SOURCE) || defined(_XOPEN_SOURCE)... */
 348 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 349 extern int mincore(caddr_t, size_t, char *);
 350 #endif
 351 extern long pathconf(const char *, int);
 352 extern int pause(void);
 353 extern int pipe(int *);
 354 extern int pipe2(int *, int);
 355 extern ssize_t pread(int, void *, size_t, off_t);
 356 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 357 extern void profil(unsigned short *, size_t, unsigned long, unsigned int);
 358 #endif
 359 /*
 360  * pthread_atfork() is also declared in <pthread.h> as per SUSv3. The
 361  * declarations are identical. A change to either one may also require
 362  * appropriate namespace updates in order to avoid redeclaration
 363  * warnings in the case where both prototypes are exposed via inclusion
 364  * of both <pthread.h> and <unistd.h>.
 365  */
 366 #if !defined(__XOPEN_OR_POSIX) || \
 367         ((_POSIX_C_SOURCE > 2) && !defined(_XPG6)) || \
 368         defined(__EXTENSIONS__)
 369 extern int pthread_atfork(void (*) (void), void (*) (void), void (*) (void));
 370 #endif /* !defined(__XOPEN_OR_POSIX) || ((_POSIX_C_SOURCE > 2) ... */
 371 #if !defined(_LP64) && \
 372         (!defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__))
 373 extern int ptrace(int, pid_t, int, int);
 374 #endif
 375 extern ssize_t pwrite(int, const void *, size_t, off_t);
 376 extern ssize_t read(int, void *, size_t);
 377 #if !defined(__XOPEN_OR_POSIX) || \
 378         defined(_XPG4_2) || defined(__EXTENSIONS__)
 379 extern ssize_t readlink(const char *_RESTRICT_KYWD, char *_RESTRICT_KYWD,
 380         size_t);
 381 #endif
 382 #if (!defined(__XOPEN_OR_POSIX) || (defined(_XPG3) && !defined(_XPG4))) || \
 383         defined(__EXTENSIONS__)
 384 #if __cplusplus >= 199711L
 385 namespace std {
 386 #endif
 387 extern int rename(const char *, const char *);
 388 #if __cplusplus >= 199711L
 389 } /* end of namespace std */
 390
 391 using std::rename;
 392 #endif /* __cplusplus >= 199711L */
 393 #endif /* (!defined(__XOPEN_OR_POSIX) || (defined(_XPG3)... */
 394 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 395 extern int resolvepath(const char *, char *, size_t);
 396 #endif /* !defined(__XOPEN_OR_POSIX)|| defined(__EXTENSIONS__) */
 397 extern int rmdir(const char *);
 398
 399 #if !defined(__XOPEN_OR_POSIX) || (defined(_XPG4_2) && !defined(_XPG6)) || \
 400         defined(__EXTENSIONS__)
 401 extern void *sbrk(intptr_t);
 402 #endif /* !defined(__XOPEN_OR_POSIX) || (defined(_XPG4_2)... */
 403 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__)
 404 extern int setegid(gid_t);
 405 extern int seteuid(uid_t);
 406 #endif /* !defined(__XOPEN_OR_POSIX) || defined(_XPG6) ... */
 407 extern int setgid(gid_t);
 408 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 409 extern int setgroups(int, const gid_t *);
 410 extern int sethostname(char *, int);
 411 #endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */
 412 extern int setpgid(pid_t, pid_t);
 413 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2) || defined(__EXTENSIONS__)
 414 extern pid_t setpgrp(void);
 415 extern int setregid(gid_t, gid_t);
 416 extern int setreuid(uid_t, uid_t);
 417 #endif /* !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2)... */
 418 extern pid_t setsid(void);
 419 extern int setuid(uid_t);
 420 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 421 extern void setusershell(void);
 422 #endif /* !defined(__XOPEN_OR_POSIX)|| defined(__EXTENSIONS__) */
 423 extern unsigned sleep(unsigned);
 424 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 425 extern int stime(const time_t *);
 426 #endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */
 427 #if defined(_XPG4)
 428 /* __EXTENSIONS__ makes the SVID Third Edition prototype in stdlib.h visible */
 429 extern void swab(const void *_RESTRICT_KYWD, void *_RESTRICT_KYWD, ssize_t);
 430 #endif /* defined(_XPG4) */
 431 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2) || defined(__EXTENSIONS__)
 432 extern int symlink(const char *, const char *);
 433 extern void sync(void);
 434 #endif /* !defined(__XOPEN_OR_POSIX) || defined(_XPG4_2) */
 435 #if defined(_XPG5) && !defined(_XPG6)
 436 #ifdef __PRAGMA_REDEFINE_EXTNAME
 437 #pragma redefine_extname sysconf __sysconf_xpg5
 438 #else /* __PRAGMA_REDEFINE_EXTNAME */
 439 #define sysconf __sysconf_xpg5
 440 #endif  /* __PRAGMA_REDEFINE_EXTNAME */
 441 #endif /* defined(_XPG5) && !defined(_XPG6) */
 442 extern long sysconf(int);
 443 extern pid_t tcgetpgrp(int);
 444 extern int tcsetpgrp(int, pid_t);
 445 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 446 extern off_t tell(int);
 447 #endif /* !defined(__XOPEN_OR_POSIX)... */
 448 #if __XPG_VISIBLE >= 420
 449 extern int truncate(const char *, off_t);
 450 #endif
 451 extern char *ttyname(int);
 452 #if (defined(_XPG4_2) && !defined(_XPG7)) || !defined(_STRICT_SYMBOLS)
 453 extern useconds_t ualarm(useconds_t, useconds_t);
 454 #endif
 455 extern int unlink(const char *);
 456 #if (defined(_XPG4_2) && !defined(_XPG7)) || !defined(_STRICT_SYMBOLS)
 457 extern char *getwd(char *);
 458 extern int usleep(useconds_t);
 459 extern pid_t vfork(void) __RETURNS_TWICE;
 460 #pragma unknown_control_flow(vfork)
 461 #endif
 462 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 463 extern void vhangup(void);
 464 #endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */
 465 extern ssize_t write(int, const void *, size_t);
 466 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 467 extern void yield(void);
 468 #endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */
 469
 470 #if !defined(__XOPEN_OR_POSIX) || defined(_ATFILE_SOURCE) || \
 471         defined(__EXTENSIONS__)
 472         /* || defined(_XPG7) */
 473 extern int faccessat(int, const char *, int, int);
 474 extern int fchownat(int, const char *, uid_t, gid_t, int);
 475 extern int linkat(int, const char *, int, const char *, int);
 476 extern ssize_t readlinkat(int, const char *_RESTRICT_KYWD,
 477         char *_RESTRICT_KYWD, size_t);
 478 extern int renameat(int, const char *, int, const char *);
 479 extern int symlinkat(const char *, int, const char *);
 480 extern int unlinkat(int, const char *, int);
 481 #endif  /* !defined(__XOPEN_OR_POSIX) || defined(_ATFILE_SOURCE)... */
 482 #if !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__)
 483 extern int get_nprocs(void);
 484 extern int get_nprocs_conf(void);
 485 #endif /* !defined(__XOPEN_OR_POSIX) || defined(__EXTENSIONS__) */
 486
 487 extern int getlogin_r(char *, size_t);
 488 extern int ttyname_r(int, char *, size_t);
 489
 490 #if !defined(_STRICT_SYMBOLS)
 491 extern int getentropy(void *, size_t);
 492 #endif  /* !_STRICT_SYMBOLS */
 493
 494 #if __UNLEASHED_VISIBLE
 495 extern mode_t getmode(const void *, mode_t);
 496 extern void *setmode(const char *);
 497 #endif
 498
 499 #ifdef  __cplusplus
 500 }
 501 #endif
 502
 503 #endif /* _UNISTD_H */