unistd.h revision 117030
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 117030 2003-06-29 17:33:34Z gordon $ 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/_types.h> 44 45#ifndef _GID_T_DECLARED 46typedef __gid_t gid_t; 47#define _GID_T_DECLARED 48#endif 49 50#ifndef _OFF_T_DECLARED 51typedef __off_t off_t; 52#define _OFF_T_DECLARED 53#endif 54 55#ifndef _PID_T_DECLARED 56typedef __pid_t pid_t; 57#define _PID_T_DECLARED 58#endif 59 60#ifndef _SIZE_T_DECLARED 61typedef __size_t size_t; 62#define _SIZE_T_DECLARED 63#endif 64 65#ifndef _SSIZE_T_DECLARED 66typedef __ssize_t ssize_t; 67#define _SSIZE_T_DECLARED 68#endif 69 70#ifndef _UID_T_DECLARED 71typedef __uid_t uid_t; 72#define _UID_T_DECLARED 73#endif 74 75#ifndef _USECONDS_T_DECLARED 76typedef __useconds_t useconds_t; 77#define _USECONDS_T_DECLARED 78#endif 79 80#define STDIN_FILENO 0 /* standard input file descriptor */ 81#define STDOUT_FILENO 1 /* standard output file descriptor */ 82#define STDERR_FILENO 2 /* standard error file descriptor */ 83 84#ifndef NULL 85#define NULL 0 /* null pointer constant */ 86#endif 87 88#if __XSI_VISIBLE || __POSIX_VISIBLE >= 200112 89#define F_ULOCK 0 /* unlock locked section */ 90#define F_LOCK 1 /* lock a section for exclusive use */ 91#define F_TLOCK 2 /* test and lock a section for exclusive use */ 92#define F_TEST 3 /* test a section for locks by other procs */ 93#endif 94 95/* 96 * POSIX options and option groups we unconditionally do or don't 97 * implement. This list includes those options which are exclusively 98 * implemented (or not) in user mode. Please keep this list in 99 * alphabetical order. 100 * 101 * Anything which is defined as zero below **must** have an 102 * implementation for the corresponding sysconf() which is able to 103 * determine conclusively whether or not the feature is supported. 104 * Anything which is defined as other than -1 below **must** have 105 * complete headers, types, and function declarations as specified by 106 * the POSIX standard; however, if the relevant sysconf() function 107 * returns -1, the functions may be stubbed out. 108 */ 109#define _POSIX_BARRIERS -1 110#define _POSIX_READER_WRITER_LOCKS 200112L 111#define _POSIX_REGEXP 1 112#define _POSIX_SHELL 1 113#define _POSIX_SPAWN -1 114#define _POSIX_SPIN_LOCKS -1 115#define _POSIX_THREAD_ATTR_STACKADDR 200112L 116#define _POSIX_THREAD_ATTR_STACKSIZE 200112L 117#define _POSIX_THREAD_CPUTIME -1 118#define _POSIX_THREAD_PRIO_INHERIT 200112L 119#define _POSIX_THREAD_PRIO_PROTECT 200112L 120#define _POSIX_THREAD_PRIORITY_SCHEDULING 200112L 121#define _POSIX_THREAD_PROCESS_SHARED -1 122#define _POSIX_THREAD_SAFE_FUNCTIONS -1 123#define _POSIX_THREAD_SPORADIC_SERVER -1 124#define _POSIX_THREADS 200112L 125#define _POSIX_TRACE -1 126#define _POSIX_TRACE_EVENT_FILTER -1 127#define _POSIX_TRACE_INHERIT -1 128#define _POSIX_TRACE_LOG -1 129#define _POSIX2_C_BIND 200112L /* mandatory */ 130#define _POSIX2_C_DEV -1 /* need c99 utility */ 131#define _POSIX2_CHAR_TERM 1 132#define _POSIX2_FORT_DEV -1 /* need fort77 utility */ 133#define _POSIX2_FORT_RUN 200112L 134#define _POSIX2_LOCALEDEF -1 135#define _POSIX2_PBS -1 136#define _POSIX2_PBS_ACCOUNTING -1 137#define _POSIX2_PBS_CHECKPOINT -1 138#define _POSIX2_PBS_LOCATE -1 139#define _POSIX2_PBS_MESSAGE -1 140#define _POSIX2_PBS_TRACK -1 141#define _POSIX2_SW_DEV -1 /* XXX ??? */ 142#define _POSIX2_UPE 200112L 143#define _V6_ILP32_OFF32 -1 144#define _V6_ILP32_OFFBIG 0 145#define _V6_LP64_OFF64 0 146#define _V6_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/* Keys for the confstr(3) function. */ 301#if __POSIX_VISIBLE >= 199209 302#define _CS_PATH 1 /* default value of PATH */ 303#endif 304 305#if __POSIX_VISIBLE >= 200112 306#define _CS_POSIX_V6_ILP32_OFF32_CFLAGS 2 307#define _CS_POSIX_V6_ILP32_OFF32_LDFLAGS 3 308#define _CS_POSIX_V6_ILP32_OFF32_LIBS 4 309#define _CS_POSIX_V6_ILP32_OFFBIG_CFLAGS 5 310#define _CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS 6 311#define _CS_POSIX_V6_ILP32_OFFBIG_LIBS 7 312#define _CS_POSIX_V6_LP64_OFF64_CFLAGS 8 313#define _CS_POSIX_V6_LP64_OFF64_LDFLAGS 9 314#define _CS_POSIX_V6_LP64_OFF64_LIBS 10 315#define _CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS 11 316#define _CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS 12 317#define _CS_POSIX_V6_LPBIG_OFFBIG_LIBS 13 318#define _CS_POSIX_V6_WIDTH_RESTRICTED_ENVS 14 319#endif 320 321__BEGIN_DECLS 322/* 1003.1-1990 */ 323void _exit(int) __dead2; 324int access(const char *, int); 325unsigned int alarm(unsigned int); 326int chdir(const char *); 327int chown(const char *, uid_t, gid_t); 328int close(int); 329int dup(int); 330int dup2(int, int); 331int eaccess(const char *, int); 332int execl(const char *, const char *, ...); 333int execle(const char *, const char *, ...); 334int execlp(const char *, const char *, ...); 335int execv(const char *, char * const *); 336int execve(const char *, char * const *, char * const *); 337int execvp(const char *, char * const *); 338int execvP(const char *, const char *, char * const *); 339pid_t fork(void); 340long fpathconf(int, int); 341char *getcwd(char *, size_t); 342gid_t getegid(void); 343uid_t geteuid(void); 344gid_t getgid(void); 345int getgroups(int, gid_t []); 346char *getlogin(void); 347pid_t getpgrp(void); 348pid_t getpid(void); 349pid_t getppid(void); 350uid_t getuid(void); 351int isatty(int); 352int link(const char *, const char *); 353#ifndef _LSEEK_DECLARED 354#define _LSEEK_DECLARED 355off_t lseek(int, off_t, int); 356#endif 357long pathconf(const char *, int); 358int pause(void); 359int pipe(int *); 360ssize_t read(int, void *, size_t); 361int rmdir(const char *); 362int setgid(gid_t); 363int setpgid(pid_t, pid_t); 364void setproctitle(const char *_fmt, ...) __printf0like(1, 2); 365pid_t setsid(void); 366int setuid(uid_t); 367unsigned int sleep(unsigned int); 368long sysconf(int); 369pid_t tcgetpgrp(int); 370int tcsetpgrp(int, pid_t); 371char *ttyname(int); 372int unlink(const char *); 373ssize_t write(int, const void *, size_t); 374 375/* 1003.2-1992 */ 376#if __POSIX_VISIBLE >= 199209 || __XSI_VISIBLE 377size_t confstr(int, char *, size_t); 378int getopt(int, char * const [], const char *); 379 380extern char *optarg; /* getopt(3) external variables */ 381extern int optind, opterr, optopt; 382#endif 383 384/* ISO/IEC 9945-1: 1996 */ 385#if __POSIX_VISIBLE >= 199506 || __XSI_VISIBLE 386int fsync(int); 387 388/* 389 * ftruncate() was in the POSIX Realtime Extension (it's used for shared 390 * memory), but truncate() was not. 391 */ 392#ifndef _FTRUNCATE_DECLARED 393#define _FTRUNCATE_DECLARED 394int ftruncate(int, off_t); 395#endif 396#endif 397 398#if __POSIX_VISIBLE >= 199506 399int getlogin_r(char *, int); 400#endif 401 402/* 1003.1-2001 */ 403#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE 404int fchown(int, uid_t, gid_t); 405int readlink(const char *, char *, int); 406#endif 407#if __POSIX_VISIBLE >= 200112 408int gethostname(char *, int /* socklen_t */); 409int setegid(gid_t); 410int seteuid(uid_t); 411#endif 412 413/* 414 * symlink() was originally in POSIX.1a, which was withdrawn after 415 * being overtaken by events (1003.1-2001). It was in XPG4.2, and of 416 * course has been in BSD since 4.2. 417 */ 418#if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE >= 402 || __BSD_VISIBLE 419int symlink(const char * __restrict, const char * __restrict); 420#endif 421 422/* X/Open System Interfaces */ 423#if __XSI_VISIBLE 424char *crypt(const char *, const char *); 425/* char *ctermid(char *); */ /* XXX ??? */ 426int encrypt(char *, int); 427int fchdir(int); 428long gethostid(void); 429int getpgid(pid_t _pid); 430int getsid(pid_t _pid); 431char *getwd(char *); /* LEGACY: obsoleted by getcwd() */ 432int lchown(const char *, uid_t, gid_t); 433int lockf(int, int, off_t); 434int nice(int); 435ssize_t pread(int, void *, size_t, off_t); 436ssize_t pwrite(int, const void *, size_t, off_t); 437int setpgrp(pid_t _pid, pid_t _pgrp); /* obsoleted by setpgid() */ 438int setregid(gid_t, gid_t); 439int setreuid(uid_t, uid_t); 440/* void swab(const void * __restrict, void * __restrict, ssize_t); */ 441void sync(void); 442useconds_t ualarm(useconds_t, useconds_t); 443int usleep(useconds_t); 444pid_t vfork(void); 445 446/* See comment at ftruncate() above. */ 447#ifndef _TRUNCATE_DECLARED 448#define _TRUNCATE_DECLARED 449int truncate(const char *, off_t); 450#endif 451#endif /* __XSI_VISIBLE */ 452 453#if __XSI_VISIBLE <= 500 || __BSD_VISIBLE 454int brk(const void *); 455int chroot(const char *); 456int getdtablesize(void); 457int getpagesize(void) __pure2; 458char *getpass(const char *); 459void *sbrk(intptr_t); 460#endif 461 462#if __BSD_VISIBLE 463struct timeval; /* select(2) */ 464int acct(const char *); 465int async_daemon(void); 466int check_utility_compat(const char *); 467const char * 468 crypt_get_format(void); 469int crypt_set_format(const char *); 470int des_cipher(const char *, char *, long, int); 471int des_setkey(const char *key); 472void endusershell(void); 473int exect(const char *, char * const *, char * const *); 474char *fflagstostr(u_long); 475int getdomainname(char *, int); 476int getgrouplist(const char *, gid_t, gid_t *, int *); 477mode_t getmode(const void *, mode_t); 478int getpeereid(int, uid_t *, gid_t *); 479int getresgid(gid_t *, gid_t *, gid_t *); 480int getresuid(uid_t *, uid_t *, uid_t *); 481char *getusershell(void); 482int initgroups(const char *, gid_t); 483int iruserok(unsigned long, int, const char *, const char *); 484int iruserok_sa(const void *, int, int, const char *, const char *); 485int issetugid(void); 486char *mkdtemp(char *); 487int mknod(const char *, mode_t, dev_t); 488#ifndef _MKSTEMP_DECLARED 489int mkstemp(char *); 490#define _MKSTEMP_DECLARED 491#endif 492int mkstemps(char *, int); 493#ifndef _MKTEMP_DECLARED 494char *mktemp(char *); 495#define _MKTEMP_DECLARED 496#endif 497int nfsclnt(int, void *); 498int nfssvc(int, void *); 499int profil(char *, size_t, vm_offset_t, int); 500int rcmd(char **, int, const char *, const char *, const char *, int *); 501int rcmd_af(char **, int, const char *, 502 const char *, const char *, int *, int); 503int rcmdsh(char **, int, const char *, 504 const char *, const char *, const char *); 505char *re_comp(const char *); 506int re_exec(const char *); 507int reboot(int); 508int revoke(const char *); 509pid_t rfork(int); 510pid_t rfork_thread(int, void *, int (*)(void *), void *); 511int rresvport(int *); 512int rresvport_af(int *, int); 513int ruserok(const char *, int, const char *, const char *); 514#if __BSD_VISIBLE 515#ifndef _SELECT_DECLARED 516#define _SELECT_DECLARED 517int select(int, fd_set *, fd_set *, fd_set *, struct timeval *); 518#endif 519#endif 520int setdomainname(const char *, int); 521int setgroups(int, const gid_t *); 522void sethostid(long); 523int sethostname(const char *, int); 524#ifndef _SETKEY_DECLARED 525int setkey(const char *); 526#define _SETKEY_DECLARED 527#endif 528int setlogin(const char *); 529void *setmode(const char *); 530int setresgid(gid_t, gid_t, gid_t); 531int setresuid(uid_t, uid_t, uid_t); 532int setrgid(gid_t); 533int setruid(uid_t); 534void setusershell(void); 535int strtofflags(char **, u_long *, u_long *); 536int swapon(const char *); 537int swapoff(const char *); 538int syscall(int, ...); 539off_t __syscall(quad_t, ...); 540int ttyslot(void); 541int undelete(const char *); 542int unwhiteout(const char *); 543void *valloc(size_t); /* obsoleted by malloc() */ 544 545extern char *suboptarg; /* getsubopt(3) external variable */ 546#ifndef _GETSUBOPT_DECLARED 547int getsubopt(char **, char * const *, char **); 548#define _GETSUBOPT_DECLARED 549#endif 550extern int optreset; /* getopt(3) external variable */ 551#endif /* __BSD_VISIBLE */ 552__END_DECLS 553 554#endif /* !_UNISTD_H_ */ 555