StdLib/Include/sys/unistd.h

   1 /*  $NetBSD: unistd.h,v 1.35 2006/08/14 18:17:48 rpaulo Exp $ */
   2
   3 /*
   4  * Copyright (c) 1989, 1993
   5  *  The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *  @(#)unistd.h  8.2 (Berkeley) 1/7/94
  32  */
  33
  34 #ifndef _SYS_UNISTD_H_
  35 #define _SYS_UNISTD_H_
  36
  37 #include <sys/featuretest.h>
  38
  39 /* compile-time symbolic constants */
  40 #define _POSIX_JOB_CONTROL  /* implementation supports job control */
  41
  42 /*
  43  * According to POSIX 1003.1:
  44  * "The saved set-user-ID capability allows a program to regain the
  45  * effective user ID established at the last exec call."
  46  * However, the setuid/setgid function as specified by POSIX 1003.1 does
  47  * not allow changing the effective ID from the super-user without also
  48  * changed the saved ID, so it is impossible to get super-user privileges
  49  * back later.  Instead we provide this feature independent of the current
  50  * effective ID through the seteuid/setegid function.  In addition, we do
  51  * not use the saved ID as specified by POSIX 1003.1 in setuid/setgid,
  52  * because this would make it impossible for a set-user-ID executable
  53  * owned by a user other than the super-user to permanently revoke its
  54  * extra privileges.
  55  */
  56 #ifdef  _NOT_AVAILABLE
  57 #define _POSIX_SAVED_IDS  /* saved set-user-ID and set-group-ID */
  58 #endif
  59
  60 #define _POSIX_VERSION    199009L
  61 #define _POSIX2_VERSION   199212L
  62
  63 /* execution-time symbolic constants */
  64         /* chown requires appropriate privileges */
  65 #define _POSIX_CHOWN_RESTRICTED 1
  66         /* clock selection */
  67 #define _POSIX_CLOCK_SELECTION  -1
  68         /* too-long path components generate errors */
  69 #define _POSIX_NO_TRUNC   1
  70         /* may disable terminal special characters */
  71 #define _POSIX_VDISABLE   ((unsigned char)'\377')
  72         /* file synchronization is available */
  73 #define _POSIX_FSYNC    1
  74         /* synchronized I/O is available */
  75 #define _POSIX_SYNCHRONIZED_IO  1
  76         /* memory mapped files */
  77 #define _POSIX_MAPPED_FILES 1
  78         /* memory locking of whole address space */
  79 #define _POSIX_MEMLOCK    1
  80         /* memory locking address ranges */
  81 #define _POSIX_MEMLOCK_RANGE  1
  82         /* memory access protections */
  83 #define _POSIX_MEMORY_PROTECTION 1
  84         /* monotonic clock */
  85 #define _POSIX_MONOTONIC_CLOCK  200112L
  86         /* threads */
  87 #define _POSIX_THREADS    200112L
  88         /* semaphores */
  89 #define _POSIX_SEMAPHORES 0
  90         /* barriers */
  91 #define _POSIX_BARRIERS   200112L
  92         /* timers */
  93 #define _POSIX_TIMERS   200112L
  94         /* spin locks */
  95 #define _POSIX_SPIN_LOCKS 200112L
  96         /* read/write locks */
  97 #define _POSIX_READER_WRITER_LOCKS  200112L
  98         /* XPG4.2 shared memory */
  99 #define _XOPEN_SHM    0
 100
 101 #if defined(_NETBSD_SOURCE)
 102 /* whence values for lseek(2); renamed by POSIX 1003.1 */
 103 #define L_SET   SEEK_SET
 104 #define L_INCR    SEEK_CUR
 105 #define L_XTND    SEEK_END
 106
 107 /*
 108  * fsync_range values.
 109  *
 110  * Note the following flag values were chosen to not overlap
 111  * values for SEEK_XXX flags.  While not currently implemented,
 112  * it is possible to extend this call to respect SEEK_CUR and
 113  * SEEK_END offset addressing modes.
 114  */
 115 #define FDATASYNC 0x0010  /* sync data and minimal metadata */
 116 #define FFILESYNC 0x0020  /* sync data and metadata */
 117 #define FDISKSYNC 0x0040  /* flush disk caches after sync */
 118 #endif
 119
 120 /* configurable pathname variables; use as argument to pathconf(3) */
 121 #define _PC_LINK_MAX     1
 122 #define _PC_MAX_CANON    2
 123 #define _PC_MAX_INPUT    3
 124 #define _PC_NAME_MAX     4
 125 #define _PC_PATH_MAX     5
 126 #define _PC_PIPE_BUF     6
 127 #define _PC_CHOWN_RESTRICTED   7
 128 #define _PC_NO_TRUNC     8
 129 #define _PC_VDISABLE     9
 130 #define _PC_SYNC_IO   10
 131 #define _PC_FILESIZEBITS  11
 132
 133 /* configurable system variables; use as argument to sysconf(3) */
 134 /*
 135  * XXX The value of _SC_CLK_TCK is embedded in <time.h>.
 136  * XXX The value of _SC_PAGESIZE is embedded in <sys/shm.h>.
 137  */
 138 #define _SC_ARG_MAX    1
 139 #define _SC_CHILD_MAX    2
 140 #define _O_SC_CLK_TCK    3 /* Old version, always 100 */
 141 #define _SC_NGROUPS_MAX    4
 142 #define _SC_OPEN_MAX     5
 143 #define _SC_JOB_CONTROL    6
 144 #define _SC_SAVED_IDS    7
 145 #define _SC_VERSION    8
 146 #define _SC_BC_BASE_MAX    9
 147 #define _SC_BC_DIM_MAX    10
 148 #define _SC_BC_SCALE_MAX  11
 149 #define _SC_BC_STRING_MAX 12
 150 #define _SC_COLL_WEIGHTS_MAX  13
 151 #define _SC_EXPR_NEST_MAX 14
 152 #define _SC_LINE_MAX    15
 153 #define _SC_RE_DUP_MAX    16
 154 #define _SC_2_VERSION   17
 155 #define _SC_2_C_BIND    18
 156 #define _SC_2_C_DEV   19
 157 #define _SC_2_CHAR_TERM   20
 158 #define _SC_2_FORT_DEV    21
 159 #define _SC_2_FORT_RUN    22
 160 #define _SC_2_LOCALEDEF   23
 161 #define _SC_2_SW_DEV    24
 162 #define _SC_2_UPE   25
 163 #define _SC_STREAM_MAX    26
 164 #define _SC_TZNAME_MAX    27
 165 #define _SC_PAGESIZE    28
 166 #define _SC_PAGE_SIZE   _SC_PAGESIZE  /* 1170 compatibility */
 167 #define _SC_FSYNC   29
 168 #define _SC_XOPEN_SHM   30
 169 #define _SC_SYNCHRONIZED_IO 31
 170 #define _SC_IOV_MAX   32
 171 #define _SC_MAPPED_FILES  33
 172 #define _SC_MEMLOCK   34
 173 #define _SC_MEMLOCK_RANGE 35
 174 #define _SC_MEMORY_PROTECTION 36
 175 #define _SC_LOGIN_NAME_MAX  37
 176 #define _SC_MONOTONIC_CLOCK 38
 177 #define _SC_CLK_TCK   39 /* New, variable version */
 178 #define _SC_ATEXIT_MAX    40
 179 #define _SC_THREADS   41
 180 #define _SC_SEMAPHORES    42
 181 #define _SC_BARRIERS    43
 182 #define _SC_TIMERS    44
 183 #define _SC_SPIN_LOCKS    45
 184 #define _SC_READER_WRITER_LOCKS 46
 185 #define _SC_GETGR_R_SIZE_MAX  47
 186 #define _SC_GETPW_R_SIZE_MAX  48
 187 #define _SC_CLOCK_SELECTION 49
 188
 189 /* configurable system strings */
 190 #define _CS_PATH     1
 191
 192 #endif /* !_SYS_UNISTD_H_ */