posix/bits/posix1_lim.h

   1 /* Copyright (C) 1991-1993,96,98,2000-2003,2004 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 /*
  20  *      POSIX Standard: 2.9.2 Minimum Values    Added to <limits.h>
  21  *
  22  *      Never include this file directly; use <limits.h> instead.
  23  */
  24
  25 #ifndef _BITS_POSIX1_LIM_H
  26 #define _BITS_POSIX1_LIM_H      1
  27
  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 /* Number of descriptors that a process may examine with `pselect' or
  91    `select'.  */
  92 #define _POSIX_FD_SETSIZE       _POSIX_OPEN_MAX
  93
  94 /* Number of bytes in a pathname.  */
  95 #define _POSIX_PATH_MAX         256
  96
  97 /* Number of bytes than can be written atomically to a pipe.  */
  98 #define _POSIX_PIPE_BUF         512
  99
 100 /* The number of repeated occurrences of a BRE permitted by the
 101    REGEXEC and REGCOMP functions when using the interval notation.  */
 102 #define _POSIX_RE_DUP_MAX       255
 103
 104 /* Minimal number of realtime signals reserved for the application.  */
 105 #define _POSIX_RTSIG_MAX        8
 106
 107 /* Number of semaphores a process can have.  */
 108 #define _POSIX_SEM_NSEMS_MAX    256
 109
 110 /* Maximal value of a semaphore.  */
 111 #define _POSIX_SEM_VALUE_MAX    32767
 112
 113 /* Number of pending realtime signals.  */
 114 #define _POSIX_SIGQUEUE_MAX     32
 115
 116 /* Largest value of a `ssize_t'.  */
 117 #define _POSIX_SSIZE_MAX        32767
 118
 119 /* Number of streams a process can have open at once.  */
 120 #define _POSIX_STREAM_MAX       8
 121
 122 /* The number of bytes in a symbolic link.  */
 123 #define _POSIX_SYMLINK_MAX      255
 124
 125 /* The number of symbolic links that can be traversed in the
 126    resolution of a pathname in the absence of a loop.  */
 127 #define _POSIX_SYMLOOP_MAX      8
 128
 129 /* Number of timer for a process.  */
 130 #define _POSIX_TIMER_MAX        32
 131
 132 /* Maximum number of characters in a tty name.  */
 133 #define _POSIX_TTY_NAME_MAX     9
 134
 135 /* Maximum length of a timezone name (element of `tzname').  */
 136 #define _POSIX_TZNAME_MAX       6
 137
 138 /* Maximum number of connections that can be queued on a socket.  */
 139 #define _POSIX_QLIMIT           1
 140
 141 /* Maximum number of bytes that can be buffered on a socket for send
 142    or receive.  */
 143 #define _POSIX_HIWAT            _POSIX_PIPE_BUF
 144
 145 /* Maximum number of elements in an `iovec' array.  */
 146 #define _POSIX_UIO_MAXIOV       16
 147
 148 /* Maximum clock resolution in nanoseconds.  */
 149 #define _POSIX_CLOCKRES_MIN     20000000
 150
 151
 152 /* Get the implementation-specific values for the above.  */
 153 #include <bits/local_lim.h>
 154
 155
 156 #ifndef SSIZE_MAX
 157 # define SSIZE_MAX      LONG_MAX
 158 #endif
 159
 160
 161 /* This value is a guaranteed minimum maximum.
 162    The current maximum can be got from `sysconf'.  */
 163
 164 #ifndef NGROUPS_MAX
 165 # define NGROUPS_MAX    8
 166 #endif
 167
 168 #endif  /* bits/posix1_lim.h  */