text: /*-
   * Copyright (c) 1991, 1993, 1994
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   *	@(#)unistd.h	8.12 (Berkeley) 4/27/95
   * $FreeBSD: src/include/unistd.h,v 1.93 2009/03/14 19:11:08 das Exp $
   */
  
  #ifndef _UNISTD_H_
  #define	_UNISTD_H_
  
  #include <sys/cdefs.h>
  #include <sys/types.h>			/* XXX adds too much pollution. */
  #include <sys/unistd.h>
  #include <sys/_null.h>
  
  #if __XSI_VISIBLE
  #ifndef _INTPTR_T_DECLARED
  typedef	__intptr_t	intptr_t;
  #define	_INTPTR_T_DECLARED
  #endif
  #endif /* __XSI_VISIBLE */
  
  #ifndef _GID_T_DECLARED
  typedef	__uint32_t	gid_t;		/* XXX __gid_t */
  #define	_GID_T_DECLARED
  #endif
  
  #ifndef _OFF_T_DECLARED
  typedef	__off_t		off_t;
  #define	_OFF_T_DECLARED
  #endif
  
  #ifndef _PID_T_DECLARED
  typedef	__pid_t		pid_t;
  #define	_PID_T_DECLARED
  #endif
  
  #ifndef _SIZE_T_DECLARED
  typedef	__size_t	size_t;		/* _GCC_SIZE_T OK */
  #define	_SIZE_T_DECLARED
  #endif
  
  #ifndef _SSIZE_T_DECLARED
  typedef	__ssize_t	ssize_t;
  #define	_SSIZE_T_DECLARED
  #endif
  
  #ifndef _UID_T_DECLARED
  typedef	__uint32_t	uid_t;		/* XXX __uid_t */
  #define	_UID_T_DECLARED
  #endif
  
  #define	 STDIN_FILENO	0	/* standard input file descriptor */
  #define	STDOUT_FILENO	1	/* standard output file descriptor */
  #define	STDERR_FILENO	2	/* standard error file descriptor */
  
  #if __XSI_VISIBLE || __POSIX_VISIBLE >= 200112
  #define	F_ULOCK		0	/* unlock locked section */
  #define	F_LOCK		1	/* lock a section for exclusive use */
  #define	F_TLOCK		2	/* test and lock a section for exclusive use */
  #define	F_TEST		3	/* test a section for locks by other procs */
  #endif
  
  /*
   * Extended API support (DragonFly specific)
   */
  #if __BSD_VISIBLE
  
  #define _HAVE_EXTEXIT		1
  #define _HAVE_EXTPREAD		1
  #define _HAVE_EXTPREADV		1
  #define _HAVE_EXTPWRITE		1
  #define _HAVE_EXTPWRITEV	1
  
  #endif
  
  /*
   * POSIX options and option groups we unconditionally do or don't
   * implement.  This list includes those options which are exclusively
   * implemented (or not) in user mode.  Please keep this list in
   * alphabetical order.
   *
   * Anything which is defined as zero below **must** have an
   * implementation for the corresponding sysconf() which is able to
   * determine conclusively whether or not the feature is supported.
   * Anything which is defined as other than -1 below **must** have
   * complete headers, types, and function declarations as specified by
   * the POSIX standard; however, if the relevant sysconf() function
   * returns -1, the functions may be stubbed out.
   */
  #define	_POSIX_READER_WRITER_LOCKS	200112L	/* mandatory ([THR]) */
  #define	_POSIX_REGEXP			1	/* mandatory */
  #define	_POSIX_SHELL			1	/* mandatory */
  #define	_POSIX_SPAWN			200112L	/* [SPN] */
  #define	_POSIX_THREAD_ATTR_STACKADDR	200112L	/* [TSA] */
  #define	_POSIX_THREAD_ATTR_STACKSIZE	200112L	/* [TSS] */
  #define	_POSIX_THREAD_PRIO_INHERIT	200112L	/* [TPI] */
  #define	_POSIX_THREAD_PRIO_PROTECT	200112L	/* [TPP] */
  #define	_POSIX_THREAD_PRIORITY_SCHEDULING 200112L /* [TPS] */
  #define	_POSIX_THREAD_PROCESS_SHARED	-1	/* [TSH] */
  #define	_POSIX_THREAD_ROBUST_PRIO_INHERIT -1	/* [RPI] */
  #define	_POSIX_THREAD_ROBUST_PRIO_PROTECT -1	/* [RPP] */
  #define	_POSIX_THREAD_SAFE_FUNCTIONS	200112L	/* mandatory ([TSF]) */
  #define	_POSIX_THREAD_SPORADIC_SERVER	-1	/* [TSP] */
  #define	_POSIX_THREADS			200112L	/* mandatory ([THR]) */
  #define	_POSIX_TRACE			-1	/* [TRC] obsolescent */
  #define	_POSIX_TRACE_EVENT_FILTER	-1	/* [TEF] obsolescent */
  #define	_POSIX_TRACE_INHERIT		-1	/* [TRI] obsolescent */
  #define	_POSIX_TRACE_LOG		-1	/* [TRL] obsolescent */
  
  #define	_POSIX2_C_BIND			200809L	/* mandatory */
  #define	_POSIX2_C_DEV			200809L	/* [CD] */
  #define	_POSIX2_CHAR_TERM		1
  #define	_POSIX2_FORT_DEV		-1	/* [FD] obsolescent */
  #define	_POSIX2_FORT_RUN		200809L	/* [FR] */
  #define	_POSIX2_LOCALEDEF		200809L
  #define	_POSIX2_PBS			-1	/* [BE] obsolescent */
  #define	_POSIX2_PBS_ACCOUNTING		-1	/* [BE] obsolescent */
  #define	_POSIX2_PBS_CHECKPOINT		-1	/* [BE] obsolescent */
  #define	_POSIX2_PBS_LOCATE		-1	/* [BE] obsolescent */
  #define	_POSIX2_PBS_MESSAGE		-1	/* [BE] obsolescent */
  #define	_POSIX2_PBS_TRACK		-1	/* [BE] obsolescent */
  #define	_POSIX2_SW_DEV			200809L	/* [SD] */
  #define	_POSIX2_UPE			200809L	/* [UP] */
  
  #define	_V6_ILP32_OFF32			-1
  #define	_V6_ILP32_OFFBIG		0
  #define	_V6_LP64_OFF64			0
  #define	_V6_LPBIG_OFFBIG		-1
  
  #define	_V7_ILP32_OFF32			-1
  #define	_V7_ILP32_OFFBIG		0
  #define	_V7_LP64_OFF64			0
  #define	_V7_LPBIG_OFFBIG		-1
  
  #if __XSI_VISIBLE
  #define	_XOPEN_CRYPT			-1
  #define	_XOPEN_ENH_I18N			1	/* mandatory */
  #define	_XOPEN_LEGACY			-1	/* until _XOPEN_SOURCE < 700 */
  #define	_XOPEN_REALTIME			-1	/* missing: [ML] and [SIO] */
  #define	_XOPEN_REALTIME_THREADS		-1	/* missing: [RPI] and [RPP] */
  #define	_XOPEN_UNIX			-1
  #endif
  
  /* Define the POSIX.2 version we target for compliance. */
  #define	_POSIX2_VERSION		199212L
  
  /*
   * POSIX-style system configuration variable accessors (for the
   * sysconf function).  The kernel does not directly implement the
   * sysconf() interface; rather, a C library stub translates references
   * to sysconf() into calls to sysctl() using a giant switch statement.
   * Those that are marked `user' are implemented entirely in the C
   * library and never query the kernel.  pathconf() is implemented
   * directly by the kernel so those are not defined here.
   */
  #define	_SC_ARG_MAX		 1
  #define	_SC_CHILD_MAX		 2
  #define	_SC_CLK_TCK		 3
  #define	_SC_NGROUPS_MAX		 4
  #define	_SC_OPEN_MAX		 5
  #define	_SC_JOB_CONTROL		 6
  #define	_SC_SAVED_IDS		 7
  #define	_SC_VERSION		 8
  #define	_SC_BC_BASE_MAX		 9 /* user */
  #define	_SC_BC_DIM_MAX		10 /* user */
  #define	_SC_BC_SCALE_MAX	11 /* user */
  #define	_SC_BC_STRING_MAX	12 /* user */
  #define	_SC_COLL_WEIGHTS_MAX	13 /* user */
  #define	_SC_EXPR_NEST_MAX	14 /* user */
  #define	_SC_LINE_MAX		15 /* user */
  #define	_SC_RE_DUP_MAX		16 /* user */
  #define	_SC_2_VERSION		17 /* user */
  #define	_SC_2_C_BIND		18 /* user */
  #define	_SC_2_C_DEV		19 /* user */
  #define	_SC_2_CHAR_TERM		20 /* user */
  #define	_SC_2_FORT_DEV		21 /* user */
  #define	_SC_2_FORT_RUN		22 /* user */
  #define	_SC_2_LOCALEDEF		23 /* user */
  #define	_SC_2_SW_DEV		24 /* user */
  #define	_SC_2_UPE		25 /* user */
  #define	_SC_STREAM_MAX		26 /* user */
  #define	_SC_TZNAME_MAX		27 /* user */
  
  #if __POSIX_VISIBLE >= 199309
  #define	_SC_ASYNCHRONOUS_IO	28
  #define	_SC_MAPPED_FILES	29
  #define	_SC_MEMLOCK		30
  #define	_SC_MEMLOCK_RANGE	31
  #define	_SC_MEMORY_PROTECTION	32
  #define	_SC_MESSAGE_PASSING	33
  #define	_SC_PRIORITIZED_IO	34
  #define	_SC_PRIORITY_SCHEDULING	35
  #define	_SC_REALTIME_SIGNALS	36
  #define	_SC_SEMAPHORES		37
  #define	_SC_FSYNC		38
  #define	_SC_SHARED_MEMORY_OBJECTS 39
  #define	_SC_SYNCHRONIZED_IO	40
  #define	_SC_TIMERS		41
  #define	_SC_AIO_LISTIO_MAX	42
  #define	_SC_AIO_MAX		43
  #define	_SC_AIO_PRIO_DELTA_MAX	44
  #define	_SC_DELAYTIMER_MAX	45
  #define	_SC_MQ_OPEN_MAX		46
  #define	_SC_PAGESIZE		47
  #define	_SC_RTSIG_MAX		48
  #define	_SC_SEM_NSEMS_MAX	49
  #define	_SC_SEM_VALUE_MAX	50
  #define	_SC_SIGQUEUE_MAX	51
  #define	_SC_TIMER_MAX		52
  #endif
  
  #if __POSIX_VISIBLE >= 200112
  #define	_SC_2_PBS		59 /* user */
  #define	_SC_2_PBS_ACCOUNTING	60 /* user */
  #define	_SC_2_PBS_CHECKPOINT	61 /* user */
  #define	_SC_2_PBS_LOCATE	62 /* user */
  #define	_SC_2_PBS_MESSAGE	63 /* user */
  #define	_SC_2_PBS_TRACK		64 /* user */
  #define	_SC_ADVISORY_INFO	65
  #define	_SC_BARRIERS		66 /* user */
  #define	_SC_CLOCK_SELECTION	67
  #define	_SC_CPUTIME		68
  #define	_SC_FILE_LOCKING	69
  #define	_SC_GETGR_R_SIZE_MAX	70 /* user */
  #define	_SC_GETPW_R_SIZE_MAX	71 /* user */
  #define	_SC_HOST_NAME_MAX	72
  #define	_SC_LOGIN_NAME_MAX	73
  #define	_SC_MONOTONIC_CLOCK	74
  #define	_SC_MQ_PRIO_MAX		75
  #define	_SC_READER_WRITER_LOCKS	76 /* user */
  #define	_SC_REGEXP		77 /* user */
  #define	_SC_SHELL		78 /* user */
  #define	_SC_SPAWN		79 /* user */
  #define	_SC_SPIN_LOCKS		80 /* user */
  #define	_SC_SPORADIC_SERVER	81
  #define	_SC_THREAD_ATTR_STACKADDR 82 /* user */
  #define	_SC_THREAD_ATTR_STACKSIZE 83 /* user */
  #define	_SC_THREAD_CPUTIME	84 /* user */
  #define	_SC_THREAD_DESTRUCTOR_ITERATIONS 85 /* user */
  #define	_SC_THREAD_KEYS_MAX	86 /* user */
  #define	_SC_THREAD_PRIO_INHERIT	87 /* user */
  #define	_SC_THREAD_PRIO_PROTECT	88 /* user */
  #define	_SC_THREAD_PRIORITY_SCHEDULING 89 /* user */
  #define	_SC_THREAD_PROCESS_SHARED 90 /* user */
  #define	_SC_THREAD_SAFE_FUNCTIONS 91 /* user */
  #define	_SC_THREAD_SPORADIC_SERVER 92 /* user */
  #define	_SC_THREAD_STACK_MIN	93 /* user */
  #define	_SC_THREAD_THREADS_MAX	94 /* user */
  #define	_SC_TIMEOUTS		95 /* user */
  #define	_SC_THREADS		96 /* user */
  #define	_SC_TRACE		97 /* user */
  #define	_SC_TRACE_EVENT_FILTER	98 /* user */
  #define	_SC_TRACE_INHERIT	99 /* user */
  #define	_SC_TRACE_LOG		100 /* user */
  #define	_SC_TTY_NAME_MAX	101 /* user */
  #define	_SC_TYPED_MEMORY_OBJECTS 102
  #define	_SC_V6_ILP32_OFF32	103 /* user */
  #define	_SC_V6_ILP32_OFFBIG	104 /* user */
  #define	_SC_V6_LP64_OFF64	105 /* user */
  #define	_SC_V6_LPBIG_OFFBIG	106 /* user */
  #define	_SC_IPV6		118
  #define	_SC_RAW_SOCKETS		119
  #define	_SC_SYMLOOP_MAX		120
  #endif
  
  #if __XSI_VISIBLE
  #define	_SC_ATEXIT_MAX		107 /* user */
  #define	_SC_IOV_MAX		56
  #define	_SC_PAGE_SIZE		_SC_PAGESIZE
  #define	_SC_XOPEN_CRYPT		108 /* user */
  #define	_SC_XOPEN_ENH_I18N	109 /* user */
  #define	_SC_XOPEN_LEGACY	110 /* user */
  #define	_SC_XOPEN_REALTIME	111
  #define	_SC_XOPEN_REALTIME_THREADS 112
  #define	_SC_XOPEN_SHM		113
  #define	_SC_XOPEN_STREAMS	114
  #define	_SC_XOPEN_UNIX		115
  #define	_SC_XOPEN_VERSION	116
  #define	_SC_XOPEN_XCU_VERSION	117 /* user */
  #endif
  
  #if __BSD_VISIBLE
  #define	_SC_NPROCESSORS_CONF	57
  #define	_SC_NPROCESSORS_ONLN	58
  #define	_SC_LEVEL1_DCACHE_LINESIZE 128
  #endif
  
  /* Extensions found in Solaris and Linux. */
  #define	_SC_PHYS_PAGES		121
  
  #if __POSIX_VISIBLE >= 200809
  #define	_SC_V7_ILP32_OFF32	122 /* user */
  #define	_SC_V7_ILP32_OFFBIG	123 /* user */
  #define	_SC_V7_LP64_OFF64	124 /* user */
  #define	_SC_V7_LPBIG_OFFBIG	125 /* user */
  #define	_SC_THREAD_ROBUST_PRIO_INHERIT 126 /* user */
  #define	_SC_THREAD_ROBUST_PRIO_PROTECT 127 /* user */
  #endif
  
  /* Keys for the confstr(3) function. */
  #if __POSIX_VISIBLE >= 199209
  #define	_CS_PATH		1	/* default value of PATH */
  #endif
  
  #if __POSIX_VISIBLE >= 200112
  #define	_CS_POSIX_V6_ILP32_OFF32_CFLAGS		2
  #define	_CS_POSIX_V6_ILP32_OFF32_LDFLAGS	3
  #define	_CS_POSIX_V6_ILP32_OFF32_LIBS		4
  #define	_CS_POSIX_V6_ILP32_OFFBIG_CFLAGS	5
  #define	_CS_POSIX_V6_ILP32_OFFBIG_LDFLAGS	6
  #define	_CS_POSIX_V6_ILP32_OFFBIG_LIBS		7
  #define	_CS_POSIX_V6_LP64_OFF64_CFLAGS		8
  #define	_CS_POSIX_V6_LP64_OFF64_LDFLAGS		9
  #define	_CS_POSIX_V6_LP64_OFF64_LIBS		10
  #define	_CS_POSIX_V6_LPBIG_OFFBIG_CFLAGS	11
  #define	_CS_POSIX_V6_LPBIG_OFFBIG_LDFLAGS	12
  #define	_CS_POSIX_V6_LPBIG_OFFBIG_LIBS		13
  #define	_CS_POSIX_V6_WIDTH_RESTRICTED_ENVS	14
  #endif
  
  #if __POSIX_VISIBLE >= 200809
  #define	_CS_POSIX_V7_ILP32_OFF32_CFLAGS		15
  #define	_CS_POSIX_V7_ILP32_OFF32_LDFLAGS	16
  #define	_CS_POSIX_V7_ILP32_OFF32_LIBS		17
  #define	_CS_POSIX_V7_ILP32_OFFBIG_CFLAGS	18
  #define	_CS_POSIX_V7_ILP32_OFFBIG_LDFLAGS	19
  #define	_CS_POSIX_V7_ILP32_OFFBIG_LIBS		20
  #define	_CS_POSIX_V7_LP64_OFF64_CFLAGS		21
  #define	_CS_POSIX_V7_LP64_OFF64_LDFLAGS		22
  #define	_CS_POSIX_V7_LP64_OFF64_LIBS		23
  #define	_CS_POSIX_V7_LPBIG_OFFBIG_CFLAGS	24
  #define	_CS_POSIX_V7_LPBIG_OFFBIG_LDFLAGS	25
  #define	_CS_POSIX_V7_LPBIG_OFFBIG_LIBS		26
  #define	_CS_POSIX_V7_WIDTH_RESTRICTED_ENVS	27
  #endif
  
  __BEGIN_DECLS
  /* 1003.1-1990 */
  void	 _exit(int) __dead2;
  int	 access(const char *, int);
  unsigned int	 alarm(unsigned int);
  int	 chdir(const char *);
  int	 chown(const char *, uid_t, gid_t);
  int	 close(int);
  int	 dup(int);
  int	 dup2(int, int);
  int	 execl(const char *, const char *, ...);
  int	 execle(const char *, const char *, ...);
  int	 execlp(const char *, const char *, ...);
  int	 execv(const char *, char * const *);
  int	 execve(const char *, char * const *, char * const *);
  int	 execvp(const char *, char * const *);
  pid_t	 fork(void);
  long	 fpathconf(int, int);
  char	*getcwd(char *, size_t);
  gid_t	 getegid(void);
  uid_t	 geteuid(void);
  gid_t	 getgid(void);
  int	 getgroups(int, gid_t []);
  char	*getlogin(void);
  pid_t	 getpgrp(void);
  pid_t	 getpid(void);
  pid_t	 getppid(void);
  uid_t	 getuid(void);
  int	 isatty(int);
  int	 link(const char *, const char *);
  off_t	 lseek(int, off_t, int);
  long	 pathconf(const char *, int);
  int	 pause(void);
  int	 pipe(int *);
  ssize_t	 read(int, void *, size_t);
  int	 rmdir(const char *);
  int	 setgid(gid_t);
  int	 setpgid(pid_t, pid_t);
  pid_t	 setsid(void);
  int	 setuid(uid_t);
  unsigned int	 sleep(unsigned int);
  long	 sysconf(int);
  pid_t	 tcgetpgrp(int);
  int	 tcsetpgrp(int, pid_t);
  char	*ttyname(int);
  int	 ttyname_r(int, char *, size_t);
  int	 unlink(const char *);
  ssize_t	 write(int, const void *, size_t);
  
  /* 1003.2-1992 */
  #if __POSIX_VISIBLE >= 199209 || __XSI_VISIBLE
  size_t	 confstr(int, char *, size_t);
  #ifndef _GETOPT_DECLARED
  #define	_GETOPT_DECLARED
  int	 getopt(int, char * const [], const char *);
  
  extern char *optarg;			/* getopt(3) external variables */
  extern int optind, opterr, optopt;
  #endif /* _GETOPT_DECLARED */
  #endif
  
  /* ISO/IEC 9945-1: 1996 */
  #if __POSIX_VISIBLE >= 199506 || __XSI_VISIBLE
  #if 0 /* XXX missing */
  int	 fdatasync(int);
  #endif
  int	 fsync(int);
  
  /*
   * ftruncate() was in the POSIX Realtime Extension (it's used for shared
   * memory), but truncate() was not.
   */
  int	 ftruncate(int, off_t);
  #endif
  
  #if __POSIX_VISIBLE >= 199506
  int	 getlogin_r(char *, size_t);
  #endif
  
  /* 1003.1-2001 */
  #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE
  int	 fchown(int, uid_t, gid_t);
  ssize_t	 readlink(const char * __restrict, char * __restrict, size_t);
  #endif
  #if __POSIX_VISIBLE >= 200112
  int	 gethostname(char *, size_t);
  int	 setegid(gid_t);
  int	 seteuid(uid_t);
  #endif
  
  /* 1003.1-2008 */
  #if __POSIX_VISIBLE >= 200809 || __XSI_VISIBLE
  int	 getsid(pid_t _pid);
  int	 fchdir(int);
  int	 getpgid(pid_t _pid);
  int	 lchown(const char *, uid_t, gid_t);
  #ifndef _MKDTEMP_DECLARED
  char	*mkdtemp(char *);
  #define	_MKDTEMP_DECLARED
  #endif
  #ifndef _MKSTEMP_DECLARED
  int	 mkstemp(char *);
  #define	_MKSTEMP_DECLARED
  #endif
  ssize_t	 pread(int, void *, size_t, off_t);
  ssize_t	 pwrite(int, const void *, size_t, off_t);
  
  /* See comment at ftruncate() above. */
  int	 truncate(const char *, off_t);
  #endif /* __POSIX_VISIBLE >= 200809 || __XSI_VISIBLE */
  
  #if __POSIX_VISIBLE >= 200809
  int	faccessat(int, const char *, int, int);
  int	fchownat(int, const char *, uid_t, gid_t, int);
  #if 0 /* XXX missing */
  int	fexecve(int, char *const [], char *const []);
  #endif
  int	linkat(int, const char *, int, const char *, int);
  ssize_t	readlinkat(int, const char * __restrict, char * __restrict, size_t);
  int	symlinkat(const char *, int, const char *);
  int	unlinkat(int, const char *, int);
  #endif /* __POSIX_VISIBLE >= 200809 */
  
  /*
   * symlink() was originally in POSIX.1a, which was withdrawn after
   * being overtaken by events (1003.1-2001).  It was in XPG4.2, and of
   * course has been in BSD since 4.2.
   */
  #if __POSIX_VISIBLE >= 200112 || __XSI_VISIBLE >= 402
  int	 symlink(const char *, const char *);
  #endif
  
  /* X/Open System Interfaces */
  #if __XSI_VISIBLE
  char	*crypt(const char *, const char *);
  int	 encrypt(char *, int);
  long	 gethostid(void);
  int	 lockf(int, int, off_t);
  int	 nice(int);
  int	 setregid(gid_t, gid_t);
  int	 setreuid(uid_t, uid_t);
  void	 swab(const void * __restrict, void * __restrict, ssize_t);
  void	 sync(void);
  #endif /* __XSI_VISIBLE */
  
  #if __BSD_VISIBLE || (__XSI_VISIBLE && __XSI_VISIBLE < 600)
  int	 chroot(const char *);
  int	 chroot_kernel(const char *);
  int	 getdtablesize(void);
  int	 getpagesize(void) __pure2;
  char	*getpass(const char *);
  void	*sbrk(intptr_t);
  #endif
  
  #if __BSD_VISIBLE || (__XSI_VISIBLE && __XSI_VISIBLE < 700)
  char	*getwd(char *);			/* LEGACY (obsoleted by getcwd()) */
  unsigned int
  	 ualarm(unsigned int, unsigned int);
  int	 usleep(unsigned int);
  pid_t	 vfork(void) __returns_twice;
  #endif
  
  #if __BSD_VISIBLE
  struct iovec;
  int	 acct(const char *);
  int	 async_daemon(void);
  int	 closefrom(int);
  const char *
  	 crypt_get_format(void);
  int	 crypt_set_format(const char *);
  int	 dup3(int, int, int);
  int	 eaccess(const char *, int);
  void	 endusershell(void);
  int	 exect(const char *, char * const *, char * const *);
  int	 execvP(const char *, const char *, char * const *);
  void	 extexit(int, int, void *);
  ssize_t	 extpread(int, void *, size_t, int, off_t);
  ssize_t	 extpreadv(int, const struct iovec *, int, int, off_t);
  ssize_t	 extpwrite(int, const void *, size_t, int, off_t);
  ssize_t	 extpwritev(int, const struct iovec *, int, int, off_t);
  char	*fflagstostr(unsigned long);
  int	 getdomainname(char *, int);
  int	 getgrouplist(const char *, gid_t, gid_t *, int *);
  mode_t	 getmode(const void *, mode_t);
  int	 getosreldate(void);
  int	 getpeereid(int, uid_t *, gid_t *);
  int	 getresgid(gid_t *, gid_t *, gid_t *);
  int	 getresuid(uid_t *, uid_t *, uid_t *);
  char	*getusershell(void);
  int	 initgroups(const char *, gid_t);
  int	 iruserok(unsigned long, int, const char *, const char *);
  int	 iruserok_sa(const void *, int, int, const char *, const char *);
  int	 issetugid(void);
  long	 lpathconf(const char *, int);
  #ifndef _LWP_GETTID_DECLARED
  lwpid_t  lwp_gettid(void);
  #define _LWP_GETTID_DECLARED
  #endif
  #ifndef _LWP_SETNAME_DECLARED
  int	lwp_getname(lwpid_t, char *, size_t);
  int	lwp_setname(lwpid_t, const char *);
  #define _LWP_SETNAME_DECLARED
  #endif
  #ifndef	_MKNOD_DECLARED
  int	 mknod(const char *, mode_t, dev_t);
  #define	_MKNOD_DECLARED
  #endif
  int	 mkstemps(char *, int);
  #ifndef _MKTEMP_DECLARED
  char	*mktemp(char *);
  #define	_MKTEMP_DECLARED
  #endif
  int	 nfssvc(int, void *);
  int	 pipe2(int *, int);
  int	 profil(char *, size_t, unsigned long, unsigned int);
  int	 rcmd(char **, int, const char *, const char *, const char *, int *);
  int	 rcmd_af(char **, int, const char *, const char *, const char *, int *,
  		 int);
  int	 rcmdsh(char **, int, const char *, const char *, const char *,
  		const char *);
  char	*re_comp(const char *);
  int	 re_exec(const char *);
  int	 reboot(int);
  int	 revoke(const char *);
  pid_t	 rfork(int);
  pid_t	 rfork_thread(int, void *, int (*)(void *), void *);
  int	 rresvport(int *);
  int	 rresvport_af(int *, int);
  int	 ruserok(const char *, int, const char *, const char *);
  int	 setdomainname(const char *, int);
  int	 setgroups(int, const gid_t *);
  void	 sethostid(long);
  int	 sethostname(const char *, int);
  int	 setlogin(const char *);
  void	*setmode(const char *);
  int	 setpgrp(pid_t _pid, pid_t _pgrp); /* obsoleted by setpgid() */
  void	 setproctitle(const char *_fmt, ...) __printf0like(1, 2);
  int	 setresgid(gid_t, gid_t, gid_t);
  int	 setresuid(uid_t, uid_t, uid_t);
  int	 setrgid(gid_t);
  int	 setruid(uid_t);
  void	 setusershell(void);
  int	 strtofflags(char **, unsigned long *, unsigned long *);
  int	 swapoff(const char *);
  int	 swapon(const char *);
  int	 syscall(int, ...);
  off_t	 __syscall(quad_t, ...);
  int	 umtx_sleep(volatile const int *, int , int);
  int	 umtx_wakeup(volatile const int *, int);
  int	 undelete(const char *);
  void	*valloc(size_t);			/* obsoleted by malloc() */
  int	 varsym_get(int, const char *, char *, int);
  int	 varsym_list(int, char *, int, int *);
  int	 varsym_set(int, const char *, const char *);
  
  #ifndef _OPTRESET_DECLARED
  #define	_OPTRESET_DECLARED
  extern int optreset;			/* getopt(3) external variable */
  #endif
  #endif /* __BSD_VISIBLE */
  __END_DECLS
  
  #endif /* !_UNISTD_H_ */
  