/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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.
 */

#ifndef _UNISTD_H_
#define _UNISTD_H_

#include <sys/types.h>                  /* XXX adds too much pollution. */
#include <sys/unistd.h>
#include <sys/_null.h>
#include <sys/_types.h>

#if !defined(_STANDALONE) && defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0
#include <ssp/unistd.h>
#endif

#ifndef _GID_T_DECLARED
typedef __gid_t         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;
#define _SIZE_T_DECLARED
#endif

#ifndef _SSIZE_T_DECLARED
typedef __ssize_t       ssize_t;
#define _SSIZE_T_DECLARED
#endif

#ifndef _UID_T_DECLARED
typedef __uid_t         uid_t;
#define _UID_T_DECLARED
#endif

#ifndef _USECONDS_T_DECLARED
typedef __useconds_t    useconds_t;
#define _USECONDS_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

/*
 * 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_BARRIERS                 200112L
#define _POSIX_CPUTIME                  200112L
#define _POSIX_READER_WRITER_LOCKS      200112L
#define _POSIX_REGEXP                   1
#define _POSIX_SHELL                    1
#define _POSIX_SPAWN                    200112L
#define _POSIX_SPIN_LOCKS               200112L
#define _POSIX_THREAD_ATTR_STACKADDR    200112L
#define _POSIX_THREAD_ATTR_STACKSIZE    200112L
#define _POSIX_THREAD_CPUTIME           200112L
#define _POSIX_THREAD_PRIO_INHERIT      200112L
#define _POSIX_THREAD_PRIO_PROTECT      200112L
#define _POSIX_THREAD_PRIORITY_SCHEDULING 200112L
#define _POSIX_THREAD_PROCESS_SHARED    200112L
#define _POSIX_THREAD_SAFE_FUNCTIONS    -1
#define _POSIX_THREAD_SPORADIC_SERVER   -1
#define _POSIX_THREADS                  200112L
#define _POSIX_TRACE                    -1
#define _POSIX_TRACE_EVENT_FILTER       -1
#define _POSIX_TRACE_INHERIT            -1
#define _POSIX_TRACE_LOG                -1
#define _POSIX2_C_BIND                  200112L /* mandatory */
#define _POSIX2_C_DEV                   -1 /* need c99 utility */
#define _POSIX2_CHAR_TERM               1
#define _POSIX2_FORT_DEV                -1 /* need fort77 utility */
#define _POSIX2_FORT_RUN                200112L
#define _POSIX2_LOCALEDEF               -1
#define _POSIX2_PBS                     -1
#define _POSIX2_PBS_ACCOUNTING          -1
#define _POSIX2_PBS_CHECKPOINT          -1
#define _POSIX2_PBS_LOCATE              -1
#define _POSIX2_PBS_MESSAGE             -1
#define _POSIX2_PBS_TRACK               -1
#define _POSIX2_SW_DEV                  -1 /* XXX ??? */
#define _POSIX2_UPE                     200112L
#define _V6_ILP32_OFF32                 -1
#define _V6_ILP32_OFFBIG                0
#define _V6_LP64_OFF64                  0
#define _V6_LPBIG_OFFBIG                -1

#if __XSI_VISIBLE
#define _XOPEN_CRYPT                    -1 /* XXX ??? */
#define _XOPEN_ENH_I18N                 -1 /* mandatory in XSI */
#define _XOPEN_LEGACY                   -1
#define _XOPEN_REALTIME                 -1
#define _XOPEN_REALTIME_THREADS         -1
#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_CPUSET_SIZE         122
#define _SC_UEXTERR_MAXLEN      123 /* user */
#endif

#if __POSIX_VISIBLE >= 202405
#define _SC_NSIG                124
#endif

/* Extensions found in Solaris and Linux. */
#define _SC_PHYS_PAGES          121

/* 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

__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);
void     closefrom(int);
int      dup(int);
int      dup2(int, int);
int      execl(const char *, const char *, ...) __null_sentinel;
int      execle(const char *, const char *, ...);
int      execlp(const char *, const char *, ...) __null_sentinel;
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 *);
#ifndef _LSEEK_DECLARED
#define _LSEEK_DECLARED
off_t    lseek(int, off_t, int);
#endif
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
int      fsync(int);
int      fdatasync(int);

/*
 * ftruncate() was in the POSIX Realtime Extension (it's used for shared
 * memory), but truncate() was not.
 */
#ifndef _FTRUNCATE_DECLARED
#define _FTRUNCATE_DECLARED
int      ftruncate(int, off_t);
#endif
#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);
ssize_t  pread(int, void *, size_t, off_t);
ssize_t  pwrite(int, const void *, size_t, off_t);

/* See comment at ftruncate() above. */
#ifndef _TRUNCATE_DECLARED
#define _TRUNCATE_DECLARED
int      truncate(const char *, off_t);
#endif
#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);
int     fexecve(int, char *const [], char *const []);
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 * __restrict, const char * __restrict);
#endif

/* X/Open System Interfaces */
#if __XSI_VISIBLE
char    *crypt(const char *, const char *);
long     gethostid(void);
int      lockf(int, int, off_t);
int      nice(int);
int      setregid(gid_t, gid_t);
int      setreuid(uid_t, uid_t);

#ifndef _SWAB_DECLARED
#define _SWAB_DECLARED
void     swab(const void * __restrict, void * __restrict, ssize_t);
#endif /* _SWAB_DECLARED */

void     sync(void);

#endif /* __XSI_VISIBLE */

#if (__XSI_VISIBLE && __XSI_VISIBLE <= 500) || __BSD_VISIBLE
int      brk(const void *);
int      chroot(const char *);
int      getdtablesize(void);
int      getpagesize(void) __pure2;
char    *getpass(const char *);
void    *sbrk(intptr_t);
#endif

#if (__XSI_VISIBLE && __XSI_VISIBLE <= 600) || __BSD_VISIBLE
char    *getwd(char *);                 /* obsoleted by getcwd() */
useconds_t
         ualarm(useconds_t, useconds_t);
int      usleep(useconds_t);
pid_t    vfork(void) __returns_twice;
#endif

#if __BSD_VISIBLE
struct timeval;                         /* select(2) */

struct crypt_data {
        int     initialized;    /* For compatibility with glibc. */
        char    __buf[256];     /* Buffer returned by crypt_r(). */
};

int      acct(const char *);
int      async_daemon(void);
int      check_utility_compat(const char *);
int      close_range(unsigned int, unsigned int, int);
ssize_t  copy_file_range(int, off_t *, int, off_t *, size_t, unsigned int);
const char *
         crypt_get_format(void);
char    *crypt_r(const char *, const char *, struct crypt_data *);
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 *);
int      execvpe(const char *, char * const *, char * const *);
int      feature_present(const char *);
int      fchroot(int);
char    *fflagstostr(u_long);
int      getdomainname(char *, int);
int      getentropy(void *, size_t);
int      getgrouplist(const char *, gid_t, gid_t *, int *);
int      getloginclass(char *, size_t);
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);
void    __FreeBSD_libc_enter_restricted_mode(void);
int      kcmp(pid_t pid1, pid_t pid2, int type, uintptr_t idx1, uintptr_t idx2);
long     lpathconf(const char *, int);
#ifndef _MKDTEMP_DECLARED
char    *mkdtemp(char *);
#define _MKDTEMP_DECLARED
#endif
#ifndef _MKNOD_DECLARED
int      mknod(const char *, mode_t, dev_t);
#define _MKNOD_DECLARED
#endif
#ifndef _MKSTEMP_DECLARED
int      mkstemp(char *);
#define _MKSTEMP_DECLARED
#endif
int      mkstemps(char *, int);
#ifndef _MKTEMP_DECLARED
char    *mktemp(char *);
#define _MKTEMP_DECLARED
#endif
int      nfssvc(int, void *);
int      nlm_syscall(int, int, int, char **);
int      pipe2(int *, int);
int      profil(char *, size_t, vm_offset_t, 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) __returns_twice;
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 *);
#ifndef _SELECT_DECLARED
#define _SELECT_DECLARED
int      select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
#endif
int      setdomainname(const char *, int);
int      setgroups(int, const gid_t *);
void     sethostid(long);
int      sethostname(const char *, int);
int      setlogin(const char *);
int      setloginclass(const char *);
void    *setmode(const char *);
int      setpgrp(pid_t, pid_t);                 /* obsoleted by setpgid() */
void     setproctitle(const char *_fmt, ...) __printf0like(1, 2);
void     setproctitle_fast(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 **, u_long *, u_long *);
int      swapon(const char *);
int      swapoff(const char *, u_int);
int      syscall(int, ...);
off_t    __syscall(quad_t, ...);
int      undelete(const char *);
int      unwhiteout(const char *);
void    *valloc(size_t);                        /* obsoleted by malloc() */
int      funlinkat(int, const char *, int, int);
pid_t    _Fork(void);

#ifndef _OPTRESET_DECLARED
#define _OPTRESET_DECLARED
extern int optreset;                    /* getopt(3) external variable */
#endif
#endif /* __BSD_VISIBLE */
__END_DECLS

#endif /* !_UNISTD_H_ */