posix/bits/posix1_lim.h

   1 /* Copyright (C) 1991-2015 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    <http://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
  28 /* These are the standard-mandated minimum values.  */
  29
  30 /* Minimum number of operations in one list I/O call.  */
  31 #define _POSIX_AIO_LISTIO_MAX   2
  32
  33 /* Minimal number of outstanding asynchronous I/O operations.  */
  34 #define _POSIX_AIO_MAX          1
  35
  36 /* Maximum length of arguments to `execve', including environment.  */
  37 #define _POSIX_ARG_MAX          4096
  38
  39 /* Maximum simultaneous processes per real user ID.  */
  40 #ifdef __USE_XOPEN2K
  41 # define _POSIX_CHILD_MAX       25
  42 #else
  43 # define _POSIX_CHILD_MAX       6
  44 #endif
  45
  46 /* Minimal number of timer expiration overruns.  */
  47 #define _POSIX_DELAYTIMER_MAX   32
  48
  49 /* Maximum length of a host name (not including the terminating null)
  50    as returned from the GETHOSTNAME function.  */
  51 #define _POSIX_HOST_NAME_MAX    255
  52
  53 /* Maximum link count of a file.  */
  54 #define _POSIX_LINK_MAX         8
  55
  56 /* Maximum length of login name.  */
  57 #define _POSIX_LOGIN_NAME_MAX   9
  58
  59 /* Number of bytes in a terminal canonical input queue.  */
  60 #define _POSIX_MAX_CANON        255
  61
  62 /* Number of bytes for which space will be
  63    available in a terminal input queue.  */
  64 #define _POSIX_MAX_INPUT        255
  65
  66 /* Maximum number of message queues open for a process.  */
  67 #define _POSIX_MQ_OPEN_MAX      8
  68
  69 /* Maximum number of supported message priorities.  */
  70 #define _POSIX_MQ_PRIO_MAX      32
  71
  72 /* Number of bytes in a filename.  */
  73 #define _POSIX_NAME_MAX         14
  74
  75 /* Number of simultaneous supplementary group IDs per process.  */
  76 #ifdef __USE_XOPEN2K
  77 # define _POSIX_NGROUPS_MAX     8
  78 #else
  79 # define _POSIX_NGROUPS_MAX     0
  80 #endif
  81
  82 /* Number of files one process can have open at once.  */
  83 #ifdef __USE_XOPEN2K
  84 # define _POSIX_OPEN_MAX        20
  85 #else
  86 # define _POSIX_OPEN_MAX        16
  87 #endif
  88
  89 #if !defined __USE_XOPEN2K || defined __USE_GNU
  90 /* Number of descriptors that a process may examine with `pselect' or
  91    `select'.  */
  92 # define _POSIX_FD_SETSIZE      _POSIX_OPEN_MAX
  93 #endif
  94
  95 /* Number of bytes in a pathname.  */
  96 #define _POSIX_PATH_MAX         256
  97
  98 /* Number of bytes than can be written atomically to a pipe.  */
  99 #define _POSIX_PIPE_BUF         512
 100
 101 /* The number of repeated occurrences of a BRE permitted by the
 102    REGEXEC and REGCOMP functions when using the interval notation.  */
 103 #define _POSIX_RE_DUP_MAX       255
 104
 105 /* Minimal number of realtime signals reserved for the application.  */
 106 #define _POSIX_RTSIG_MAX        8
 107
 108 /* Number of semaphores a process can have.  */
 109 #define _POSIX_SEM_NSEMS_MAX    256
 110
 111 /* Maximal value of a semaphore.  */
 112 #define _POSIX_SEM_VALUE_MAX    32767
 113
 114 /* Number of pending realtime signals.  */
 115 #define _POSIX_SIGQUEUE_MAX     32
 116
 117 /* Largest value of a `ssize_t'.  */
 118 #define _POSIX_SSIZE_MAX        32767
 119
 120 /* Number of streams a process can have open at once.  */
 121 #define _POSIX_STREAM_MAX       8
 122
 123 /* The number of bytes in a symbolic link.  */
 124 #define _POSIX_SYMLINK_MAX      255
 125
 126 /* The number of symbolic links that can be traversed in the
 127    resolution of a pathname in the absence of a loop.  */
 128 #define _POSIX_SYMLOOP_MAX      8
 129
 130 /* Number of timer for a process.  */
 131 #define _POSIX_TIMER_MAX        32
 132
 133 /* Maximum number of characters in a tty name.  */
 134 #define _POSIX_TTY_NAME_MAX     9
 135
 136 /* Maximum length of a timezone name (element of `tzname').  */
 137 #ifdef __USE_XOPEN2K
 138 # define _POSIX_TZNAME_MAX      6
 139 #else
 140 # define _POSIX_TZNAME_MAX      3
 141 #endif
 142
 143 #if !defined __USE_XOPEN2K || defined __USE_GNU
 144 /* Maximum number of connections that can be queued on a socket.  */
 145 # define _POSIX_QLIMIT          1
 146
 147 /* Maximum number of bytes that can be buffered on a socket for send
 148    or receive.  */
 149 # define _POSIX_HIWAT           _POSIX_PIPE_BUF
 150
 151 /* Maximum number of elements in an `iovec' array.  */
 152 # define _POSIX_UIO_MAXIOV      16
 153 #endif
 154
 155 /* Maximum clock resolution in nanoseconds.  */
 156 #define _POSIX_CLOCKRES_MIN     20000000
 157
 158
 159 /* Get the implementation-specific values for the above.  */
 160 #include <bits/local_lim.h>
 161
 162
 163 #ifndef SSIZE_MAX
 164 # define SSIZE_MAX      LONG_MAX
 165 #endif
 166
 167
 168 /* This value is a guaranteed minimum maximum.
 169    The current maximum can be got from `sysconf'.  */
 170
 171 #ifndef NGROUPS_MAX
 172 # define NGROUPS_MAX    8
 173 #endif
 174
 175 #endif  /* bits/posix1_lim.h  */