posix/bits/posix1_lim.h

   1 /* Copyright (C) 1991-2019 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 /*
  19  *      POSIX Standard: 2.9.2 Minimum Values    Added to <limits.h>
  20  *
  21  *      Never include this file directly; use <limits.h> instead.
  22  */
  23
  24 #ifndef _BITS_POSIX1_LIM_H
  25 #define _BITS_POSIX1_LIM_H      1
  26
  27 #include <bits/wordsize.h>
  28
  29 /* These are the standard-mandated minimum values.  */
  30
  31 /* Minimum number of operations in one list I/O call.  */
  32 #define _POSIX_AIO_LISTIO_MAX   2
  33
  34 /* Minimal number of outstanding asynchronous I/O operations.  */
  35 #define _POSIX_AIO_MAX          1
  36
  37 /* Maximum length of arguments to `execve', including environment.  */
  38 #define _POSIX_ARG_MAX          4096
  39
  40 /* Maximum simultaneous processes per real user ID.  */
  41 #ifdef __USE_XOPEN2K
  42 # define _POSIX_CHILD_MAX       25
  43 #else
  44 # define _POSIX_CHILD_MAX       6
  45 #endif
  46
  47 /* Minimal number of timer expiration overruns.  */
  48 #define _POSIX_DELAYTIMER_MAX   32
  49
  50 /* Maximum length of a host name (not including the terminating null)
  51    as returned from the GETHOSTNAME function.  */
  52 #define _POSIX_HOST_NAME_MAX    255
  53
  54 /* Maximum link count of a file.  */
  55 #define _POSIX_LINK_MAX         8
  56
  57 /* Maximum length of login name.  */
  58 #define _POSIX_LOGIN_NAME_MAX   9
  59
  60 /* Number of bytes in a terminal canonical input queue.  */
  61 #define _POSIX_MAX_CANON        255
  62
  63 /* Number of bytes for which space will be
  64    available in a terminal input queue.  */
  65 #define _POSIX_MAX_INPUT        255
  66
  67 /* Maximum number of message queues open for a process.  */
  68 #define _POSIX_MQ_OPEN_MAX      8
  69
  70 /* Maximum number of supported message priorities.  */
  71 #define _POSIX_MQ_PRIO_MAX      32
  72
  73 /* Number of bytes in a filename.  */
  74 #define _POSIX_NAME_MAX         14
  75
  76 /* Number of simultaneous supplementary group IDs per process.  */
  77 #ifdef __USE_XOPEN2K
  78 # define _POSIX_NGROUPS_MAX     8
  79 #else
  80 # define _POSIX_NGROUPS_MAX     0
  81 #endif
  82
  83 /* Number of files one process can have open at once.  */
  84 #ifdef __USE_XOPEN2K
  85 # define _POSIX_OPEN_MAX        20
  86 #else
  87 # define _POSIX_OPEN_MAX        16
  88 #endif
  89
  90 #if !defined __USE_XOPEN2K || defined __USE_GNU
  91 /* Number of descriptors that a process may examine with `pselect' or
  92    `select'.  */
  93 # define _POSIX_FD_SETSIZE      _POSIX_OPEN_MAX
  94 #endif
  95
  96 /* Number of bytes in a pathname.  */
  97 #define _POSIX_PATH_MAX         256
  98
  99 /* Number of bytes than can be written atomically to a pipe.  */
 100 #define _POSIX_PIPE_BUF         512
 101
 102 /* The number of repeated occurrences of a BRE permitted by the
 103    REGEXEC and REGCOMP functions when using the interval notation.  */
 104 #define _POSIX_RE_DUP_MAX       255
 105
 106 /* Minimal number of realtime signals reserved for the application.  */
 107 #define _POSIX_RTSIG_MAX        8
 108
 109 /* Number of semaphores a process can have.  */
 110 #define _POSIX_SEM_NSEMS_MAX    256
 111
 112 /* Maximal value of a semaphore.  */
 113 #define _POSIX_SEM_VALUE_MAX    32767
 114
 115 /* Number of pending realtime signals.  */
 116 #define _POSIX_SIGQUEUE_MAX     32
 117
 118 /* Largest value of a `ssize_t'.  */
 119 #define _POSIX_SSIZE_MAX        32767
 120
 121 /* Number of streams a process can have open at once.  */
 122 #define _POSIX_STREAM_MAX       8
 123
 124 /* The number of bytes in a symbolic link.  */
 125 #define _POSIX_SYMLINK_MAX      255
 126
 127 /* The number of symbolic links that can be traversed in the
 128    resolution of a pathname in the absence of a loop.  */
 129 #define _POSIX_SYMLOOP_MAX      8
 130
 131 /* Number of timer for a process.  */
 132 #define _POSIX_TIMER_MAX        32
 133
 134 /* Maximum number of characters in a tty name.  */
 135 #define _POSIX_TTY_NAME_MAX     9
 136
 137 /* Maximum length of a timezone name (element of `tzname').  */
 138 #ifdef __USE_XOPEN2K
 139 # define _POSIX_TZNAME_MAX      6
 140 #else
 141 # define _POSIX_TZNAME_MAX      3
 142 #endif
 143
 144 #if !defined __USE_XOPEN2K || defined __USE_GNU
 145 /* Maximum number of connections that can be queued on a socket.  */
 146 # define _POSIX_QLIMIT          1
 147
 148 /* Maximum number of bytes that can be buffered on a socket for send
 149    or receive.  */
 150 # define _POSIX_HIWAT           _POSIX_PIPE_BUF
 151
 152 /* Maximum number of elements in an `iovec' array.  */
 153 # define _POSIX_UIO_MAXIOV      16
 154 #endif
 155
 156 /* Maximum clock resolution in nanoseconds.  */
 157 #define _POSIX_CLOCKRES_MIN     20000000
 158
 159
 160 /* Get the implementation-specific values for the above.  */
 161 #include <bits/local_lim.h>
 162
 163
 164 #ifndef SSIZE_MAX
 165 /* ssize_t is not formally required to be the signed type
 166    corresponding to size_t, but it is for all configurations supported
 167    by glibc.  */
 168 # if __WORDSIZE == 64 || __WORDSIZE32_SIZE_ULONG
 169 #  define SSIZE_MAX     LONG_MAX
 170 # else
 171 #  define SSIZE_MAX     INT_MAX
 172 # endif
 173 #endif
 174
 175
 176 /* This value is a guaranteed minimum maximum.
 177    The current maximum can be got from `sysconf'.  */
 178
 179 #ifndef NGROUPS_MAX
 180 # define NGROUPS_MAX    8
 181 #endif
 182
 183 #endif  /* bits/posix1_lim.h  */