include/unistd.h

   1 /*-
   2  * Copyright (c) 1991, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)unistd.h    8.12 (Berkeley) 4/27/95
  34  * $FreeBSD: src/include/unistd.h,v 1.93 2009/03/14 19:11:08 das Exp $
  35  */
  36
  37 #ifndef _UNISTD_H_
  38 #define _UNISTD_H_
  39
  40 #include <sys/cdefs.h>
  41 #include <sys/types.h>                  /* XXX adds too much pollution. */
  42 #include <sys/unistd.h>
  43 #include <sys/_null.h>
  44
  45 #ifndef __returns_twice                 /* help with buildworld bootstrap */
  46 #define __returns_twice
  47 #endif
  48
  49 #ifndef _GID_T_DECLARED
  50 typedef __gid_t         gid_t;
  51 #define _GID_T_DECLARED
  52 #endif
  53
  54 #ifndef _OFF_T_DECLARED
  55 typedef __off_t         off_t;
  56 #define _OFF_T_DECLARED
  57 #endif
  58
  59 #ifndef _PID_T_DECLARED
  60 typedef __pid_t         pid_t;
  61 #define _PID_T_DECLARED
  62 #endif
  63
  64 #ifndef _SIZE_T_DECLARED
  65 typedef __size_t        size_t;
  66 #define _SIZE_T_DECLARED
  67 #endif
  68
  69 #ifndef _SSIZE_T_DECLARED
  70 typedef __ssize_t       ssize_t;
  71 #define _SSIZE_T_DECLARED
  72 #endif
  73
  74 #ifndef _UID_T_DECLARED
  75 typedef __uid_t         uid_t;
  76 #define _UID_T_DECLARED
  77 #endif
  78
  79 #define  STDIN_FILENO   0       /* standard input file descriptor */
  80 #define STDOUT_FILENO   1       /* standard output file descriptor */
  81 #define STDERR_FILENO   2       /* standard error file descriptor */
  82
  83 #if __XSI_VISIBLE || __POSIX_VISIBLE >= 200112
  84 #define F_ULOCK         0       /* unlock locked section */
  85 #define F_LOCK          1       /* lock a section for exclusive use */
  86 #define F_TLOCK         2       /* test and lock a section for exclusive use */
  87 #define F_TEST          3       /* test a section for locks by other procs */
  88 #endif
  89
  90 /*
  91  * POSIX options and option groups we unconditionally do or don't
  92  * implement.  This list includes those options which are exclusively
  93  * implemented (or not) in user mode.  Please keep this list in
  94  * alphabetical order.
  95  *
  96  * Anything which is defined as zero below **must** have an
  97  * implementation for the corresponding sysconf() which is able to
  98  * determine conclusively whether or not the feature is supported.
  99  * Anything which is defined as other than -1 below **must** have
 100  * complete headers, types, and function declarations as specified by
 101  * the POSIX standard; however, if the relevant sysconf() function
 102  * returns -1, the functions may be stubbed out.
 103  */
 104 #define _POSIX_READER_WRITER_LOCKS      200112L
 105 #define _POSIX_REGEXP                   1       /* mandatory */
 106 #define _POSIX_SHELL                    1       /* mandatory */
 107 #define _POSIX_SPAWN                    200112L
 108 #define _POSIX_THREAD_ATTR_STACKADDR    200112L
 109 #define _POSIX_THREAD_ATTR_STACKSIZE    200112L
 110 #define _POSIX_THREAD_CPUTIME           -1
 111 #define _POSIX_THREAD_PRIO_INHERIT      200112L
 112 #define _POSIX_THREAD_PRIO_PROTECT      200112L
 113 #define _POSIX_THREAD_PRIORITY_SCHEDULING 200112L
 114 #define _POSIX_THREAD_PROCESS_SHARED    -1
 115 #define _POSIX_THREAD_SAFE_FUNCTIONS    -1
 116 #define _POSIX_THREAD_SPORADIC_SERVER   -1
 117 #define _POSIX_THREADS                  200112L
 118 #define _POSIX_TRACE                    -1      /* [TRC] obsolescent */
 119 #define _POSIX_TRACE_EVENT_FILTER       -1      /* [TEF] obsolescent */
 120 #define _POSIX_TRACE_INHERIT            -1      /* [TRI] obsolescent */
 121 #define _POSIX_TRACE_LOG                -1      /* [TRL] obsolescent */
 122
 123 #define _POSIX2_C_BIND                  200809L /* mandatory */
 124 #define _POSIX2_C_DEV                   200809L /* [CD] */
 125 #define _POSIX2_CHAR_TERM               1
 126 #define _POSIX2_FORT_DEV                -1      /* [FD] need fort77 utility */
 127 #define _POSIX2_FORT_RUN                200809L /* [FR] */
 128 #define _POSIX2_LOCALEDEF               200809L
 129 #define _POSIX2_PBS                     -1      /* [BE] obsolescent */
 130 #define _POSIX2_PBS_ACCOUNTING          -1      /* [BE] obsolescent */
 131 #define _POSIX2_PBS_CHECKPOINT          -1      /* [BE] obsolescent */
 132 #define _POSIX2_PBS_LOCATE              -1      /* [BE] obsolescent */
 133 #define _POSIX2_PBS_MESSAGE             -1      /* [BE] obsolescent */
 134 #define _POSIX2_PBS_TRACK               -1      /* [BE] obsolescent */
 135 #define _POSIX2_SW_DEV                  200809L /* [SD] */
 136 #define _POSIX2_UPE                     200809L /* [UP] */
 137
 138 #define _V6_ILP32_OFF32                 -1
 139 #define _V6_ILP32_OFFBIG                0
 140 #define _V6_LP64_OFF64                  0
 141 #define _V6_LPBIG_OFFBIG                -1
 142
 143 #define _V7_ILP32_OFF32                 -1
 144 #define _V7_ILP32_OFFBIG                0
 145 #define _V7_LP64_OFF64                  0
 146 #define _V7_LPBIG_OFFBIG                -1
 147
 148 #if __XSI_VISIBLE
 149 #define _XOPEN_CRYPT                    -1 /* XXX ??? */
 150 #define _XOPEN_ENH_I18N                 -1 /* mandatory in XSI */
 151 #define _XOPEN_LEGACY                   -1
 152 #define _XOPEN_REALTIME                 -1
 153 #define _XOPEN_REALTIME_THREADS         -1
 154 #define _XOPEN_UNIX                     -1
 155 #endif
 156
 157 /* Define the POSIX.2 version we target for compliance. */
 158 #define _POSIX2_VERSION         199212L
 159
 160 /*
 161  * POSIX-style system configuration variable accessors (for the
 162  * sysconf function).  The kernel does not directly implement the
 163  * sysconf() interface; rather, a C library stub translates references
 164  * to sysconf() into calls to sysctl() using a giant switch statement.
 165  * Those that are marked `user' are implemented entirely in the C
 166  * library and never query the kernel.  pathconf() is implemented
 167  * directly by the kernel so those are not defined here.
 168  */
 169 #define _SC_ARG_MAX              1
 170 #define _SC_CHILD_MAX            2
 171 #define _SC_CLK_TCK              3
 172 #define _SC_NGROUPS_MAX          4
 173 #define _SC_OPEN_MAX             5
 174 #define _SC_JOB_CONTROL          6
 175 #define _SC_SAVED_IDS            7
 176 #define _SC_VERSION              8
 177 #define _SC_BC_BASE_MAX          9 /* user */
 178 #define _SC_BC_DIM_MAX          10 /* user */
 179 #define _SC_BC_SCALE_MAX        11 /* user */
 180 #define _SC_BC_STRING_MAX       12 /* user */
 181 #define _SC_COLL_WEIGHTS_MAX    13 /* user */
 182 #define _SC_EXPR_NEST_MAX       14 /* user */
 183 #define _SC_LINE_MAX            15 /* user */
 184 #define _SC_RE_DUP_MAX          16 /* user */
 185 #define _SC_2_VERSION           17 /* user */
 186 #define _SC_2_C_BIND            18 /* user */
 187 #define _SC_2_C_DEV             19 /* user */
 188 #define _SC_2_CHAR_TERM         20 /* user */
 189 #define _SC_2_FORT_DEV          21 /* user */
 190 #define _SC_2_FORT_RUN          22 /* user */
 191 #define _SC_2_LOCALEDEF         23 /* user */
 192 #define _SC_2_SW_DEV            24 /* user */
 193 #define _SC_2_UPE               25 /* user */
 194 #define _SC_STREAM_MAX          26 /* user */
 195 #define _SC_TZNAME_MAX          27 /* user */
 196
 197 #if __POSIX_VISIBLE >= 199309
 198 #define _SC_ASYNCHRONOUS_IO     28
 199 #define _SC_MAPPED_FILES        29
 200 #define _SC_MEMLOCK             30
 201 #define _SC_MEMLOCK_RANGE       31
 202 #define _SC_MEMORY_PROTECTION   32
 203 #define _SC_MESSAGE_PASSING     33
 204 #define _SC_PRIORITIZED_IO      34
 205 #define _SC_PRIORITY_SCHEDULING 35
 206 #define _SC_REALTIME_SIGNALS    36
 207 #define _SC_SEMAPHORES          37
 208 #define _SC_FSYNC               38
 209 #define _SC_SHARED_MEMORY_OBJECTS 39
 210 #define _SC_SYNCHRONIZED_IO     40
 211 #define _SC_TIMERS              41
 212 #define _SC_AIO_LISTIO_MAX      42
 213 #define _SC_AIO_MAX             43
 214 #define _SC_AIO_PRIO_DELTA_MAX  44
 215 #define _SC_DELAYTIMER_MAX      45
 216 #define _SC_MQ_OPEN_MAX         46
 217 #define _SC_PAGESIZE            47
 218 #define _SC_RTSIG_MAX           48
 219 #define _SC_SEM_NSEMS_MAX       49
 220 #define _SC_SEM_VALUE_MAX       50
 221 #define _SC_SIGQUEUE_MAX        51
 222 #define _SC_TIMER_MAX           52
 223 #endif
 224
 225 #if __POSIX_VISIBLE >= 200112
 226 #define _SC_2_PBS               59 /* user */
 227 #define _SC_2_PBS_ACCOUNTING    60 /* user */
 228 #define _SC_2_PBS_CHECKPOINT    61 /* user */
 229 #define _SC_2_PBS_LOCATE        62 /* user */
 230 #define _SC_2_PBS_MESSAGE       63 /* user */
 231 #define _SC_2_PBS_TRACK         64 /* user */
 232 #define _SC_ADVISORY_INFO       65
 233 #define _SC_BARRIERS            66 /* user */
 234 #define _SC_CLOCK_SELECTION     67
 235 #define _SC_CPUTIME             68
 236 #define _SC_FILE_LOCKING        69
 237 #define _SC_GETGR_R_SIZE_MAX    70 /* user */
 238 #define _SC_GETPW_R_SIZE_MAX    71 /* user */
 239 #define _SC_HOST_NAME_MAX       72
 240 #define _SC_LOGIN_NAME_MAX      73
 241 #define _SC_MONOTONIC_CLOCK     74
 242 #define _SC_MQ_PRIO_MAX         75
 243 #define _SC_READER_WRITER_LOCKS 76 /* user */
 244 #define _SC_REGEXP              77 /* user */
 245 #define _SC_SHELL               78 /* user */
 246 #define _SC_SPAWN               79 /* user */
 247 #define _SC_SPIN_LOCKS          80 /* user */
 248 #define _SC_SPORADIC_SERVER     81
 249 #define _SC_THREAD_ATTR_STACKADDR 82 /* user */
 250 #define _SC_THREAD_ATTR_STACKSIZE 83 /* user */
 251 #define _SC_THREAD_CPUTIME      84 /* user */
 252 #define _SC_THREAD_DESTRUCTOR_ITERATIONS 85 /* user */
 253 #define _SC_THREAD_KEYS_MAX     86 /* user */
 254 #define _SC_THREAD_PRIO_INHERIT 87 /* user */
 255 #define _SC_THREAD_PRIO_PROTECT 88 /* user */
 256 #define _SC_THREAD_PRIORITY_SCHEDULING 89 /* user */
 257 #define _SC_THREAD_PROCESS_SHARED 90 /* user */
 258 #define _SC_THREAD_SAFE_FUNCTIONS 91 /* user */
 259 #define _SC_THREAD_SPORADIC_SERVER 92 /* user */
 260 #define _SC_THREAD_STACK_MIN    93 /* user */
 261 #define _SC_THREAD_THREADS_MAX  94 /* user */
 262 #define _SC_TIMEOUTS            95 /* user */
 263 #define _SC_THREADS             96 /* user */
 264 #define _SC_TRACE               97 /* user */
 265 #define _SC_TRACE_EVENT_FILTER  98 /* user */
 266 #define _SC_TRACE_INHERIT       99 /* user */
 267 #define _SC_TRACE_LOG           100 /* user */
 268 #define _SC_TTY_NAME_MAX        101 /* user */
 269 #define _SC_TYPED_MEMORY_OBJECTS 102
 270 #define _SC_V6_ILP32_OFF32      103 /* user */
 271 #define _SC_V6_ILP32_OFFBIG     104 /* user */
 272 #define _SC_V6_LP64_OFF64       105 /* user */
 273 #define _SC_V6_LPBIG_OFFBIG     106 /* user */
 274 #define _SC_IPV6                118
 275 #define _SC_RAW_SOCKETS         119
 276 #define _SC_SYMLOOP_MAX         120
 277 #endif
 278
 279 #if __XSI_VISIBLE
 280 #define _SC_ATEXIT_MAX          107 /* user */
 281 #define _SC_IOV_MAX             56
 282 #define _SC_PAGE_SIZE           _SC_PAGESIZE
 283 #define _SC_XOPEN_CRYPT         108 /* user */
 284 #define _SC_XOPEN_ENH_I18N      109 /* user */
 285 #define _SC_XOPEN_LEGACY        110 /* user */
 286 #define _SC_XOPEN_REALTIME      111
 287 #define _SC_XOPEN_REALTIME_THREADS 112
 288 #define _SC_XOPEN_SHM           113
 289 #define _SC_XOPEN_STREAMS       114
 290 #define _SC_XOPEN_UNIX          115
 291 #define _SC_XOPEN_VERSION       116
 292 #define _SC_XOPEN_XCU_VERSION   117 /* user */
 293 #endif
 294
 295 #if __BSD_VISIBLE
 296 #define _SC_NPROCESSORS_CONF    57
 297 #define _SC_NPROCESSORS_ONLN    58
 298 #endif
 299
 300 /* Extensions found in Solaris and Linux. */
 301 #define _SC_PHYS_PAGES          121
 302
 303 #if __POSIX_VISIBLE >= 200809
 304 #define _SC_V7_ILP32_OFF32      122 /* user */
 305 #define _SC_V7_ILP32_OFFBIG     123 /* user */
 306 #define _SC_V7_LP64_OFF64       124 /* user */
 307 #define _SC_V7_LPBIG_OFFBIG     125 /* user */
 308 #endif
 309
 310 /* Keys for the confstr(3) function. */
 311 #if __POSIX_VISIBLE >= 199209
 312 #define _CS_PATH                1       /* default value of PATH */
 313 #endif
 314
 315 #if __POSIX_VISIBLE >= 200112
 316 #define _CS_POSIX_V6_ILP32_OFF32_CFLAGS         2
 317 #define _CS_POSIX_V6_ILP32_OFF32_LDFLAGS        3
 318 #define _CS_POSIX_V6_ILP32_OFF32_LIBS           4
 319 #define _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS        5
 320 #define _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS       6
 321 #define _CS_POSIX_V6_ILP32_OFFBIG_LIBS          7
 322 #define _CS_POSIX_V6_LP64_OFF64_CFLAGS          8
 323 #define _CS_POSIX_V6_LP64_OFF64_LDFLAGS         9
 324 #define _CS_POSIX_V6_LP64_OFF64_LIBS            10
 325 #define _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS        11
 326 #define _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS       12
 327 #define _CS_POSIX_V6_LPBIG_OFFBIG_LIBS          13
 328 #define _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS      14
 329 #endif
 330
 331 #if __POSIX_VISIBLE >= 200809
 332 #define _CS_POSIX_V7_ILP32_OFF32_CFLAGS         15
 333 #define _CS_POSIX_V7_ILP32_OFF32_LDFLAGS        16
 334 #define _CS_POSIX_V7_ILP32_OFF32_LIBS           17
 335 #define _CS_POSIX_V7_ILP32_OFFBIG_CFLAGS        18
 336 #define _CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS       19
 337 #define _CS_POSIX_V7_ILP32_OFFBIG_LIBS          20
 338 #define _CS_POSIX_V7_LP64_OFF64_CFLAGS          21
 339 #define _CS_POSIX_V7_LP64_OFF64_LDFLAGS         22
 340 #define _CS_POSIX_V7_LP64_OFF64_LIBS            23
 341 #define _CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS        24
 342 #define _CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS       25
 343 #define _CS_POSIX_V7_LPBIG_OFFBIG_LIBS          26
 344 #define _CS_POSIX_V7_WIDTH_RESTRICTED_ENVS      27
 345 #endif
 346
 347 __BEGIN_DECLS
 348 /* 1003.1-1990 */
 349 void     _exit(int) __dead2;
 350 int      access(const char *, int);
 351 unsigned int     alarm(unsigned int);
 352 int      chdir(const char *);
 353 int      chown(const char *, uid_t, gid_t);
 354 int      close(int);
 355 int      dup(int);
 356 int      dup2(int, int);
 357 #if __BSD_VISIBLE
 358 int      eaccess(const char *, int);
 359 #endif
 360 int      execl(const char *, const char *, ...);
 361 int      execle(const char *, const char *, ...);
 362 int      execlp(const char *, const char *, ...);
 363 int      execv(const char *, char * const *);
 364 int      execve(const char *, char * const *, char * const *);
 365 int      execvp(const char *, char * const *);
 366 pid_t    fork(void);
 367 long     fpathconf(int, int);
 368 char    *getcwd(char *, size_t);
 369 gid_t    getegid(void);
 370 uid_t    geteuid(void);
 371 gid_t    getgid(void);
 372 int      getgroups(int, gid_t []);
 373 char    *getlogin(void);
 374 pid_t    getpgrp(void);
 375 pid_t    getpid(void);
 376 pid_t    getppid(void);
 377 uid_t    getuid(void);
 378 int      isatty(int);
 379 int      link(const char *, const char *);
 380 #ifndef _LSEEK_DECLARED
 381 #define _LSEEK_DECLARED
 382 off_t    lseek(int, off_t, int);
 383 #endif
 384 long     pathconf(const char *, int);
 385 int      pause(void);
 386 int      pipe(int *);
 387 int      pipe2(int *, int);
 388 ssize_t  read(int, void *, size_t);
 389 int      rmdir(const char *);
 390 int      setgid(gid_t);
 391 int      setpgid(pid_t, pid_t);
 392 pid_t    setsid(void);
 393 int      setuid(uid_t);
 394 unsigned int     sleep(unsigned int);
 395 long     sysconf(int);
 396 pid_t    tcgetpgrp(int);
 397 int      tcsetpgrp(int, pid_t);
 398 char    *ttyname(int);
 399 int      ttyname_r(int, char *, size_t);
 400 int      unlink(const char *);
 401 ssize_t  write(int, const void *, size_t);
 402
 403 /* 1003.2-1992 */
 404 #if __POSIX_VISIBLE >= 199209 || __XSI_VISIBLE
 405 size_t   confstr(int, char *, size_t);
 406 #ifndef _GETOPT_DECLARED
 407 #define _GETOPT_DECLARED
 408 int      getopt(int, char * const [], const char *);
 409
 410 extern char *optarg;                    /* getopt(3) external variables */
 411 extern int optind, opterr, optopt;
 412 #endif /* _GETOPT_DECLARED */
 413 #endif
 414
 415 /* ISO/IEC 9945-1: 1996 */
 416 #if __POSIX_VISIBLE >= 199506 || __XSI_VISIBLE
 417 int      fsync(int);
 418
 419 /*
 420  * ftruncate() was in the POSIX Realtime Extension (it's used for shared
 421  * memory), but truncate() was not.
 422  */
 423 #ifndef _FTRUNCATE_DECLARED
 424 #define _FTRUNCATE_DECLARED
 425 int      ftruncate(int, off_t);
 426 #endif
 427 #endif
 428
 429 #if __POSIX_VISIBLE >= 199506
 430 int      getlogin_r(char *, int);
 431 #endif
 432
 433 /* 1003.1-2001 */
 434 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
 435 int      fchown(int, uid_t, gid_t);
 436 ssize_t  readlink(const char * __restrict, char * __restrict, size_t);
 437 #endif
 438 #if __POSIX_VISIBLE >= 200112
 439 int      gethostname(char *, size_t);
 440 int      setegid(gid_t);
 441 int      seteuid(uid_t);
 442 #endif
 443
 444 /* 1003.1-2008 */
 445 #if __POSIX_VISIBLE >= 200809 || __XSI_VISIBLE
 446 int      getsid(pid_t _pid);
 447 int      fchdir(int);
 448 int      getpgid(pid_t _pid);
 449 int      lchown(const char *, uid_t, gid_t);
 450 #ifndef _MKDTEMP_DECLARED
 451 char    *mkdtemp(char *);
 452 #define _MKDTEMP_DECLARED
 453 #endif
 454 #ifndef _MKSTEMP_DECLARED
 455 int      mkstemp(char *);
 456 #define _MKSTEMP_DECLARED
 457 #endif
 458 ssize_t  pread(int, void *, size_t, off_t);
 459 ssize_t  pwrite(int, const void *, size_t, off_t);
 460
 461 /* See comment at ftruncate() above. */
 462 #ifndef _TRUNCATE_DECLARED
 463 #define _TRUNCATE_DECLARED
 464 int      truncate(const char *, off_t);
 465 #endif
 466 #endif /* __POSIX_VISIBLE >= 200809 || __XSI_VISIBLE */
 467
 468 #if __POSIX_VISIBLE >= 200809
 469 int     faccessat(int, const char *, int, int);
 470 int     fchownat(int, const char *, uid_t, gid_t, int);
 471 #if 0
 472 int     fexecve(int, char *const [], char *const []);
 473 #endif
 474 int     linkat(int, const char *, int, const char *, int);
 475 ssize_t readlinkat(int, const char * __restrict, char * __restrict, size_t);
 476 int     symlinkat(const char *, int, const char *);
 477 int     unlinkat(int, const char *, int);
 478 #endif /* __POSIX_VISIBLE >= 200809 */
 479
 480 /*
 481  * symlink() was originally in POSIX.1a, which was withdrawn after
 482  * being overtaken by events (1003.1-2001).  It was in XPG4.2, and of
 483  * course has been in BSD since 4.2.
 484  */
 485 #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE >= 402
 486 int      symlink(const char * __restrict, const char * __restrict);
 487 #endif
 488
 489 /* X/Open System Interfaces */
 490 #if __XSI_VISIBLE
 491 char    *crypt(const char *, const char *);
 492 /* char *ctermid(char *); */            /* XXX ??? */
 493 int      encrypt(char *, int);
 494 long     gethostid(void);
 495 int      lockf(int, int, off_t);
 496 int      nice(int);
 497 int      setpgrp(pid_t _pid, pid_t _pgrp); /* obsoleted by setpgid() */
 498 int      setregid(gid_t, gid_t);
 499 int      setreuid(uid_t, uid_t);
 500
 501 #ifndef _SWAB_DECLARED
 502 #define _SWAB_DECLARED
 503 void     swab(const void * __restrict, void * __restrict, ssize_t);
 504 #endif /* _SWAB_DECLARED */
 505
 506 void     sync(void);
 507
 508 #endif /* __XSI_VISIBLE */
 509
 510 #if (__XSI_VISIBLE && __XSI_VISIBLE <= 500) || __BSD_VISIBLE
 511 int      brk(const void *);
 512 int      chroot(const char *);
 513 int      chroot_kernel(const char *);
 514 int      getdtablesize(void);
 515 int      getpagesize(void) __pure2;
 516 char    *getpass(const char *);
 517 void    *sbrk(intptr_t);
 518 #endif
 519
 520 #if (__XSI_VISIBLE && __XSI_VISIBLE <= 600) || __BSD_VISIBLE
 521 char    *getwd(char *);                 /* LEGACY (obsoleted by getcwd()) */
 522 unsigned int
 523          ualarm(unsigned int, unsigned int);
 524 int      usleep(unsigned int);
 525 pid_t    vfork(void) __returns_twice;
 526 #endif
 527
 528 #if __BSD_VISIBLE
 529 struct iovec;
 530 int      acct(const char *);
 531 int      async_daemon(void);
 532 int      closefrom(int);
 533 const char *
 534          crypt_get_format(void);
 535 int      crypt_set_format(const char *);
 536 void     endusershell(void);
 537 int      exect(const char *, char * const *, char * const *);
 538 int      execvP(const char *, const char *, char * const *);
 539 void     extexit(int, int, void *);
 540 ssize_t  extpread(int, void *, size_t, int, off_t);
 541 ssize_t  extpreadv(int, const struct iovec *, u_int, int, off_t);
 542 ssize_t  extpwrite(int, const void *, size_t, int, off_t);
 543 ssize_t  extpwritev(int, const struct iovec *, u_int, int, off_t);
 544 char    *fflagstostr(u_long);
 545 int      getdomainname(char *, int);
 546 int      getgrouplist(const char *, gid_t, gid_t *, int *);
 547 mode_t   getmode(const void *, mode_t);
 548 int      getosreldate(void);
 549 int      getpeereid(int, uid_t *, gid_t *);
 550 int      getresgid(gid_t *, gid_t *, gid_t *);
 551 int      getresuid(uid_t *, uid_t *, uid_t *);
 552 char    *getusershell(void);
 553 int      initgroups(const char *, gid_t);
 554 int      iruserok(unsigned long, int, const char *, const char *);
 555 int      iruserok_sa(const void *, int, int, const char *, const char *);
 556 int      issetugid(void);
 557 long     lpathconf(const char *, int);
 558 int      lwp_create(struct lwp_params *);
 559 lwpid_t  lwp_gettid(void);
 560 #ifndef _MKNOD_DECLARED
 561 int      mknod(const char *, mode_t, dev_t);
 562 #define _MKNOD_DECLARED
 563 #endif
 564 int      mkstemps(char *, int);
 565 #ifndef _MKTEMP_DECLARED
 566 char    *mktemp(char *);
 567 #define _MKTEMP_DECLARED
 568 #endif
 569 int      nfssvc(int, void *);
 570 int      profil(char *, size_t, vm_offset_t, int);
 571 int      rcmd(char **, int, const char *, const char *, const char *, int *);
 572 int      rcmd_af(char **, int, const char *, const char *, const char *, int *,
 573                  int);
 574 int      rcmdsh(char **, int, const char *, const char *, const char *,
 575                 const char *);
 576 char    *re_comp(const char *);
 577 int      re_exec(const char *);
 578 int      reboot(int);
 579 int      revoke(const char *);
 580 pid_t    rfork(int);
 581 pid_t    rfork_thread(int, void *, int (*)(void *), void *);
 582 int      rresvport(int *);
 583 int      rresvport_af(int *, int);
 584 int      ruserok(const char *, int, const char *, const char *);
 585 int      setdomainname(const char *, int);
 586 int      setgroups(int, const gid_t *);
 587 void     sethostid(long);
 588 int      sethostname(const char *, int);
 589 int      setlogin(const char *);
 590 void    *setmode(const char *);
 591 void     setproctitle(const char *_fmt, ...) __printf0like(1, 2);
 592 int      setresgid(gid_t, gid_t, gid_t);
 593 int      setresuid(uid_t, uid_t, uid_t);
 594 int      setrgid(gid_t);
 595 int      setruid(uid_t);
 596 void     setusershell(void);
 597 int      strtofflags(char **, u_long *, u_long *);
 598 int      swapoff(const char *);
 599 int      swapon(const char *);
 600 int      syscall(int, ...);
 601 off_t    __syscall(quad_t, ...);
 602 int      ttyslot(void);
 603 int      umtx_sleep(volatile const int *, int , int);
 604 int      umtx_wakeup(volatile const int *, int);
 605 int      undelete(const char *);
 606 int      unwhiteout(const char *);
 607 void    *valloc(size_t);                        /* obsoleted by malloc() */
 608 int      varsym_get(int, const char *, char *, int);
 609 int      varsym_list(int, char *, int, int *);
 610 int      varsym_set(int, const char *, const char *);
 611
 612 #ifndef _OPTRESET_DECLARED
 613 #define _OPTRESET_DECLARED
 614 extern int optreset;                    /* getopt(3) external variable */
 615 #endif
 616 #endif /* __BSD_VISIBLE */
 617 __END_DECLS
 618
 619 #endif /* !_UNISTD_H_ */