unistd.h revision 138659
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: head/include/unistd.h 138659 2004-12-10 15:24:40Z trhodes $ 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#include <sys/_types.h> 45 46#ifndef _GID_T_DECLARED 47typedef __gid_t gid_t; 48#define _GID_T_DECLARED 49#endif 50 51#ifndef _OFF_T_DECLARED 52typedef __off_t off_t; 53#define _OFF_T_DECLARED 54#endif 55 56#ifndef _PID_T_DECLARED 57typedef __pid_t pid_t; 58#define _PID_T_DECLARED 59#endif 60 61#ifndef _SIZE_T_DECLARED 62typedef __size_t size_t; 63#define _SIZE_T_DECLARED 64#endif 65 66#ifndef _SSIZE_T_DECLARED 67typedef __ssize_t ssize_t; 68#define _SSIZE_T_DECLARED 69#endif 70 71#ifndef _UID_T_DECLARED 72typedef __uid_t uid_t; 73#define _UID_T_DECLARED 74#endif 75 76#ifndef _USECONDS_T_DECLARED 77typedef __useconds_t useconds_t; 78#define _USECONDS_T_DECLARED 79#endif 80 81#define STDIN_FILENO 0 /* standard input file descriptor */ 82#define STDOUT_FILENO 1 /* standard output file descriptor */ 83#define STDERR_FILENO 2 /* standard error file descriptor */ 84 85#if __XSI_VISIBLE || __POSIX_VISIBLE >= 200112 86#define F_ULOCK 0 /* unlock locked section */ 87#define F_LOCK 1 /* lock a section for exclusive use */ 88#define F_TLOCK 2 /* test and lock a section for exclusive use */ 89#define F_TEST 3 /* test a section for locks by other procs */ 90#endif 91 92/* 93 * POSIX options and option groups we unconditionally do or don't 94 * implement. This list includes those options which are exclusively 95 * implemented (or not) in user mode. Please keep this list in 96 * alphabetical order. 97 * 98 * Anything which is defined as zero below **must** have an 99 * implementation for the corresponding sysconf() which is able to 100 * determine conclusively whether or not the feature is supported. 101 * Anything which is defined as other than -1 below **must** have 102 * complete headers, types, and function declarations as specified by 103 * the POSIX standard; however, if the relevant sysconf() function 104 * returns -1, the functions may be stubbed out. 105 */ 106#define _POSIX_BARRIERS -1 107#define _POSIX_READER_WRITER_LOCKS 200112L 108#define _POSIX_REGEXP 1 109#define _POSIX_SHELL 1 110#define _POSIX_SPAWN -1 111#define _POSIX_SPIN_LOCKS -1 112#define _POSIX_THREAD_ATTR_STACKADDR 200112L 113#define _POSIX_THREAD_ATTR_STACKSIZE 200112L 114#define _POSIX_THREAD_CPUTIME -1 115#define _POSIX_THREAD_PRIO_INHERIT 200112L 116#define _POSIX_THREAD_PRIO_PROTECT 200112L 117#define _POSIX_THREAD_PRIORITY_SCHEDULING 200112L 118#define _POSIX_THREAD_PROCESS_SHARED -1 119#define _POSIX_THREAD_SAFE_FUNCTIONS -1 120#define _POSIX_THREAD_SPORADIC_SERVER -1 121#define _POSIX_THREADS 200112L 122#define _POSIX_TRACE -1 123#define _POSIX_TRACE_EVENT_FILTER -1 124#define _POSIX_TRACE_INHERIT -1 125#define _POSIX_TRACE_LOG -1 126#define _POSIX2_C_BIND 200112L /* mandatory */ 127#define _POSIX2_C_DEV -1 /* need c99 utility */ 128#define _POSIX2_CHAR_TERM 1 129#define _POSIX2_FORT_DEV -1 /* need fort77 utility */ 130#define _POSIX2_FORT_RUN 200112L 131#define _POSIX2_LOCALEDEF -1 132#define _POSIX2_PBS -1 133#define _POSIX2_PBS_ACCOUNTING -1 134#define _POSIX2_PBS_CHECKPOINT -1 135#define _POSIX2_PBS_LOCATE -1 136#define _POSIX2_PBS_MESSAGE -1 137#define _POSIX2_PBS_TRACK -1 138#define _POSIX2_SW_DEV -1 /* XXX ??? */ 139#define _POSIX2_UPE 200112L 140#define _V6_ILP32_OFF32 -1 141#define _V6_ILP32_OFFBIG 0 142#define _V6_LP64_OFF64 0 143#define _V6_LPBIG_OFFBIG -1 144 145#if __XSI_VISIBLE 146#define _XOPEN_CRYPT -1 /* XXX ??? */ 147#define _XOPEN_ENH_I18N -1 /* mandatory in XSI */ 148#define _XOPEN_LEGACY -1 149#define _XOPEN_REALTIME -1 150#define _XOPEN_REALTIME_THREADS -1 151#define _XOPEN_UNIX -1 152#endif 153 154/* Define the POSIX.2 version we target for compliance. */ 155#define _POSIX2_VERSION 199212L 156 157/* 158 * POSIX-style system configuration variable accessors (for the 159 * sysconf function). The kernel does not directly implement the 160 * sysconf() interface; rather, a C library stub translates references 161 * to sysconf() into calls to sysctl() using a giant switch statement. 162 * Those that are marked `user' are implemented entirely in the C 163 * library and never query the kernel. pathconf() is implemented 164 * directly by the kernel so those are not defined here. 165 */ 166#define _SC_ARG_MAX 1 167#define _SC_CHILD_MAX 2 168#define _SC_CLK_TCK 3 169#define _SC_NGROUPS_MAX 4 170#define _SC_OPEN_MAX 5 171#define _SC_JOB_CONTROL 6 172#define _SC_SAVED_IDS 7 173#define _SC_VERSION 8 174#define _SC_BC_BASE_MAX 9 /* user */ 175#define _SC_BC_DIM_MAX 10 /* user */ 176#define _SC_BC_SCALE_MAX 11 /* user */ 177#define _SC_BC_STRING_MAX 12 /* user */ 178#define _SC_COLL_WEIGHTS_MAX 13 /* user */ 179#define _SC_EXPR_NEST_MAX 14 /* user */ 180#define _SC_LINE_MAX 15 /* user */ 181#define _SC_RE_DUP_MAX 16 /* user */ 182#define _SC_2_VERSION 17 /* user */ 183#define _SC_2_C_BIND 18 /* user */ 184#define _SC_2_C_DEV 19 /* user */ 185#define _SC_2_CHAR_TERM 20 /* user */ 186#define _SC_2_FORT_DEV 21 /* user */ 187#define _SC_2_FORT_RUN 22 /* user */ 188#define _SC_2_LOCALEDEF 23 /* user */ 189#define _SC_2_SW_DEV 24 /* user */ 190#define _SC_2_UPE 25 /* user */ 191#define _SC_STREAM_MAX 26 /* user */ 192#define _SC_TZNAME_MAX 27 /* user */ 193 194#if __POSIX_VISIBLE >= 199309 195#define _SC_ASYNCHRONOUS_IO 28 196#define _SC_MAPPED_FILES 29 197#define _SC_MEMLOCK 30 198#define _SC_MEMLOCK_RANGE 31 199#define _SC_MEMORY_PROTECTION 32 200#define _SC_MESSAGE_PASSING 33 201#define _SC_PRIORITIZED_IO 34 202#define _SC_PRIORITY_SCHEDULING 35 203#define _SC_REALTIME_SIGNALS 36 204#define _SC_SEMAPHORES 37 205#define _SC_FSYNC 38 206#define _SC_SHARED_MEMORY_OBJECTS 39 207#define _SC_SYNCHRONIZED_IO 40 208#define _SC_TIMERS 41 209#define _SC_AIO_LISTIO_MAX 42 210#define _SC_AIO_MAX 43 211#define _SC_AIO_PRIO_DELTA_MAX 44 212#define _SC_DELAYTIMER_MAX 45 213#define _SC_MQ_OPEN_MAX 46 214#define _SC_PAGESIZE 47 215#define _SC_RTSIG_MAX 48 216#define _SC_SEM_NSEMS_MAX 49 217#define _SC_SEM_VALUE_MAX 50 218#define _SC_SIGQUEUE_MAX 51 219#define _SC_TIMER_MAX 52 220#endif 221 222#if __POSIX_VISIBLE >= 200112 223#define _SC_2_PBS 59 /* user */ 224#define _SC_2_PBS_ACCOUNTING 60 /* user */ 225#define _SC_2_PBS_CHECKPOINT 61 /* user */ 226#define _SC_2_PBS_LOCATE 62 /* user */ 227#define _SC_2_PBS_MESSAGE 63 /* user */ 228#define _SC_2_PBS_TRACK 64 /* user */ 229#define _SC_ADVISORY_INFO 65 230#define _SC_BARRIERS 66 /* user */ 231#define _SC_CLOCK_SELECTION 67 232#define _SC_CPUTIME 68 233#define _SC_FILE_LOCKING 69 234#define _SC_GETGR_R_SIZE_MAX 70 /* user */ 235#define _SC_GETPW_R_SIZE_MAX 71 /* user */ 236#define _SC_HOST_NAME_MAX 72 237#define _SC_LOGIN_NAME_MAX 73 238#define _SC_MONOTONIC_CLOCK 74 239#define _SC_MQ_PRIO_MAX 75 240#define _SC_READER_WRITER_LOCKS 76 /* user */ 241#define _SC_REGEXP 77 /* user */ 242#define _SC_SHELL 78 /* user */ 243#define _SC_SPAWN 79 /* user */ 244#define _SC_SPIN_LOCKS 80 /* user */ 245#define _SC_SPORADIC_SERVER 81 246#define _SC_THREAD_ATTR_STACKADDR 82 /* user */ 247#define _SC_THREAD_ATTR_STACKSIZE 83 /* user */ 248#define _SC_THREAD_CPUTIME 84 /* user */ 249#define _SC_THREAD_DESTRUCTOR_ITERATIONS 85 /* user */ 250#define _SC_THREAD_KEYS_MAX 86 /* user */ 251#define _SC_THREAD_PRIO_INHERIT 87 /* user */ 252#define _SC_THREAD_PRIO_PROTECT 88 /* user */ 253#define _SC_THREAD_PRIORITY_SCHEDULING 89 /* user */ 254#define _SC_THREAD_PROCESS_SHARED 90 /* user */ 255#define _SC_THREAD_SAFE_FUNCTIONS 91 /* user */ 256#define _SC_THREAD_SPORADIC_SERVER 92 /* user */ 257#define _SC_THREAD_STACK_MIN 93 /* user */ 258#define _SC_THREAD_THREADS_MAX 94 /* user */ 259#define _SC_TIMEOUTS 95 /* user */ 260#define _SC_THREADS 96 /* user */ 261#define _SC_TRACE 97 /* user */ 262#define _SC_TRACE_EVENT_FILTER 98 /* user */ 263#define _SC_TRACE_INHERIT 99 /* user */ 264#define _SC_TRACE_LOG 100 /* user */ 265#define _SC_TTY_NAME_MAX 101 /* user */ 266#define _SC_TYPED_MEMORY_OBJECTS 102 267#define _SC_V6_ILP32_OFF32 103 /* user */ 268#define _SC_V6_ILP32_OFFBIG 104 /* user */ 269#define _SC_V6_LP64_OFF64 105 /* user */ 270#define _SC_V6_LPBIG_OFFBIG 106 /* user */ 271#define _SC_IPV6 118 272#define _SC_RAW_SOCKETS 119 273#define _SC_SYMLOOP_MAX 120 274#endif 275 276#if __XSI_VISIBLE 277#define _SC_ATEXIT_MAX 107 /* user */ 278#define _SC_IOV_MAX 56 279#define _SC_PAGE_SIZE _SC_PAGESIZE 280#define _SC_XOPEN_CRYPT 108 /* user */ 281#define _SC_XOPEN_ENH_I18N 109 /* user */ 282#define _SC_XOPEN_LEGACY 110 /* user */ 283#define _SC_XOPEN_REALTIME 111 284#define _SC_XOPEN_REALTIME_THREADS 112 285#define _SC_XOPEN_SHM 113 286#define _SC_XOPEN_STREAMS 114 287#define _SC_XOPEN_UNIX 115 288#define _SC_XOPEN_VERSION 116 289#define _SC_XOPEN_XCU_VERSION 117 /* user */ 290#endif 291 292#if __BSD_VISIBLE 293#define _SC_NPROCESSORS_CONF 57 294#define _SC_NPROCESSORS_ONLN 58 295#endif 296 297/* Keys for the confstr(3) function. */ 298#if __POSIX_VISIBLE >= 199209 299#define _CS_PATH 1 /* default value of PATH */ 300#endif 301 302#if __POSIX_VISIBLE >= 200112 303#define _CS_POSIX_V6_ILP32_OFF32_CFLAGS 2 304#define _CS_POSIX_V6_ILP32_OFF32_LDFLAGS 3 305#define _CS_POSIX_V6_ILP32_OFF32_LIBS 4 306#define _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS 5 307#define _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS 6 308#define _CS_POSIX_V6_ILP32_OFFBIG_LIBS 7 309#define _CS_POSIX_V6_LP64_OFF64_CFLAGS 8 310#define _CS_POSIX_V6_LP64_OFF64_LDFLAGS 9 311#define _CS_POSIX_V6_LP64_OFF64_LIBS 10 312#define _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS 11 313#define _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS 12 314#define _CS_POSIX_V6_LPBIG_OFFBIG_LIBS 13 315#define _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS 14 316#endif 317 318__BEGIN_DECLS 319/* 1003.1-1990 */ 320void _exit(int) __dead2; 321int access(const char *, int); 322unsigned int alarm(unsigned int); 323int chdir(const char *); 324int chown(const char *, uid_t, gid_t); 325int close(int); 326int dup(int); 327int dup2(int, int); 328int eaccess(const char *, int); 329int execl(const char *, const char *, ...); 330int execle(const char *, const char *, ...); 331int execlp(const char *, const char *, ...); 332int execv(const char *, char * const *); 333int execve(const char *, char * const *, char * const *); 334int execvp(const char *, char * const *); 335pid_t fork(void); 336long fpathconf(int, int); 337char *getcwd(char *, size_t); 338gid_t getegid(void); 339uid_t geteuid(void); 340gid_t getgid(void); 341int getgroups(int, gid_t []); 342char *getlogin(void); 343pid_t getpgrp(void); 344pid_t getpid(void); 345pid_t getppid(void); 346uid_t getuid(void); 347int isatty(int); 348int link(const char *, const char *); 349#ifndef _LSEEK_DECLARED 350#define _LSEEK_DECLARED 351off_t lseek(int, off_t, int); 352#endif 353long pathconf(const char *, int); 354int pause(void); 355int pipe(int *); 356ssize_t read(int, void *, size_t); 357int rmdir(const char *); 358int setgid(gid_t); 359int setpgid(pid_t, pid_t); 360void setproctitle(const char *_fmt, ...) __printf0like(1, 2); 361pid_t setsid(void); 362int setuid(uid_t); 363unsigned int sleep(unsigned int); 364long sysconf(int); 365pid_t tcgetpgrp(int); 366int tcsetpgrp(int, pid_t); 367char *ttyname(int); 368int unlink(const char *); 369ssize_t write(int, const void *, size_t); 370 371/* 1003.2-1992 */ 372#if __POSIX_VISIBLE >= 199209 || __XSI_VISIBLE 373size_t confstr(int, char *, size_t); 374#ifndef _GETOPT_DECLARED 375#define _GETOPT_DECLARED 376int getopt(int, char * const [], const char *); 377 378extern char *optarg; /* getopt(3) external variables */ 379extern int optind, opterr, optopt; 380#endif /* _GETOPT_DECLARED */ 381#endif 382 383/* ISO/IEC 9945-1: 1996 */ 384#if __POSIX_VISIBLE >= 199506 || __XSI_VISIBLE 385int fsync(int); 386 387/* 388 * ftruncate() was in the POSIX Realtime Extension (it's used for shared 389 * memory), but truncate() was not. 390 */ 391#ifndef _FTRUNCATE_DECLARED 392#define _FTRUNCATE_DECLARED 393int ftruncate(int, off_t); 394#endif 395#endif 396 397#if __POSIX_VISIBLE >= 199506 398int getlogin_r(char *, int); 399#endif 400 401/* 1003.1-2001 */ 402#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE 403int fchown(int, uid_t, gid_t); 404int readlink(const char *, char *, int); 405#endif 406#if __POSIX_VISIBLE >= 200112 407int gethostname(char *, size_t); 408int setegid(gid_t); 409int seteuid(uid_t); 410#endif 411 412/* 413 * symlink() was originally in POSIX.1a, which was withdrawn after 414 * being overtaken by events (1003.1-2001). It was in XPG4.2, and of 415 * course has been in BSD since 4.2. 416 */ 417#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE >= 402 || __BSD_VISIBLE 418int symlink(const char * __restrict, const char * __restrict); 419#endif 420 421/* X/Open System Interfaces */ 422#if __XSI_VISIBLE 423char *crypt(const char *, const char *); 424/* char *ctermid(char *); */ /* XXX ??? */ 425int encrypt(char *, int); 426int fchdir(int); 427long gethostid(void); 428int getpgid(pid_t _pid); 429int getsid(pid_t _pid); 430char *getwd(char *); /* LEGACY: obsoleted by getcwd() */ 431int lchown(const char *, uid_t, gid_t); 432int lockf(int, int, off_t); 433int nice(int); 434ssize_t pread(int, void *, size_t, off_t); 435ssize_t pwrite(int, const void *, size_t, off_t); 436int setpgrp(pid_t _pid, pid_t _pgrp); /* obsoleted by setpgid() */ 437int setregid(gid_t, gid_t); 438int setreuid(uid_t, uid_t); 439 440#ifndef _SWAB_DECLARED 441#define _SWAB_DECLARED 442void swab(const void * __restrict, void * __restrict, ssize_t); 443#endif /* _SWAB_DECLARED */ 444 445void sync(void); 446useconds_t ualarm(useconds_t, useconds_t); 447int usleep(useconds_t); 448pid_t vfork(void); 449 450/* See comment at ftruncate() above. */ 451#ifndef _TRUNCATE_DECLARED 452#define _TRUNCATE_DECLARED 453int truncate(const char *, off_t); 454#endif 455#endif /* __XSI_VISIBLE */ 456 457#if __XSI_VISIBLE <= 500 || __BSD_VISIBLE 458int brk(const void *); 459int chroot(const char *); 460int getdtablesize(void); 461int getpagesize(void) __pure2; 462char *getpass(const char *); 463void *sbrk(intptr_t); 464#endif 465 466#if __BSD_VISIBLE 467struct timeval; /* select(2) */ 468int acct(const char *); 469int async_daemon(void); 470int check_utility_compat(const char *); 471const char * 472 crypt_get_format(void); 473int crypt_set_format(const char *); 474int des_cipher(const char *, char *, long, int); 475int des_setkey(const char *key); 476void endusershell(void); 477int exect(const char *, char * const *, char * const *); 478int execvP(const char *, const char *, char * const *); 479char *fflagstostr(u_long); 480int getdomainname(char *, int); 481int getgrouplist(const char *, gid_t, gid_t *, int *); 482mode_t getmode(const void *, mode_t); 483int getpeereid(int, uid_t *, gid_t *); 484int getresgid(gid_t *, gid_t *, gid_t *); 485int getresuid(uid_t *, uid_t *, uid_t *); 486char *getusershell(void); 487int initgroups(const char *, gid_t); 488int iruserok(unsigned long, int, const char *, const char *); 489int iruserok_sa(const void *, int, int, const char *, const char *); 490int issetugid(void); 491char *mkdtemp(char *); 492int mknod(const char *, mode_t, dev_t); 493#ifndef _MKSTEMP_DECLARED 494int mkstemp(char *); 495#define _MKSTEMP_DECLARED 496#endif 497int mkstemps(char *, int); 498#ifndef _MKTEMP_DECLARED 499char *mktemp(char *); 500#define _MKTEMP_DECLARED 501#endif 502int nfssvc(int, void *); 503int profil(char *, size_t, vm_offset_t, int); 504int rcmd(char **, int, const char *, const char *, const char *, int *); 505int rcmd_af(char **, int, const char *, 506 const char *, const char *, int *, int); 507int rcmdsh(char **, int, const char *, 508 const char *, const char *, const char *); 509char *re_comp(const char *); 510int re_exec(const char *); 511int reboot(int); 512int revoke(const char *); 513pid_t rfork(int); 514pid_t rfork_thread(int, void *, int (*)(void *), void *); 515int rresvport(int *); 516int rresvport_af(int *, int); 517int ruserok(const char *, int, const char *, const char *); 518#if __BSD_VISIBLE 519#ifndef _SELECT_DECLARED 520#define _SELECT_DECLARED 521int select(int, fd_set *, fd_set *, fd_set *, struct timeval *); 522#endif 523#endif 524int setdomainname(const char *, int); 525int setgroups(int, const gid_t *); 526void sethostid(long); 527int sethostname(const char *, int); 528#ifndef _SETKEY_DECLARED 529int setkey(const char *); 530#define _SETKEY_DECLARED 531#endif 532int setlogin(const char *); 533void *setmode(const char *); 534int setresgid(gid_t, gid_t, gid_t); 535int setresuid(uid_t, uid_t, uid_t); 536int setrgid(gid_t); 537int setruid(uid_t); 538void setusershell(void); 539int strtofflags(char **, u_long *, u_long *); 540int swapon(const char *); 541int swapoff(const char *); 542int syscall(int, ...); 543off_t __syscall(quad_t, ...); 544int ttyslot(void); 545int undelete(const char *); 546int unwhiteout(const char *); 547void *valloc(size_t); /* obsoleted by malloc() */ 548 549#ifndef _OPTRESET_DECLARED 550#define _OPTRESET_DECLARED 551extern int optreset; /* getopt(3) external variable */ 552#endif 553#endif /* __BSD_VISIBLE */ 554__END_DECLS 555 556#endif /* !_UNISTD_H_ */ 557