posix/bits/posix1_lim.h

   1 /* Copyright (C) 1991,92,93,96,98,2000,2001 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 #define _POSIX_CHILD_MAX        6
  42
  43 /* Minimal number of timer expiration overruns.  */
  44 #define _POSIX_DELAYTIMER_MAX   32
  45
  46 /* Maximum link count of a file.  */
  47 #define _POSIX_LINK_MAX         8
  48
  49 /* Number of bytes in a terminal canonical input queue.  */
  50 #define _POSIX_MAX_CANON        255
  51
  52 /* Number of bytes for which space will be
  53    available in a terminal input queue.  */
  54 #define _POSIX_MAX_INPUT        255
  55
  56 /* Maximum number of message queues open for a process.  */
  57 #define _POSIX_MQ_OPEN_MAX      8
  58
  59 /* Maximum number of supported message priorities.  */
  60 #define _POSIX_MQ_PRIO_MAX      32
  61
  62 /* Number of simultaneous supplementary group IDs per process.  */
  63 #define _POSIX_NGROUPS_MAX      0
  64
  65 /* Number of files one process can have open at once.  */
  66 #define _POSIX_OPEN_MAX         16
  67
  68 /* Number of descriptors that a process may examine with `pselect' or
  69    `select'.  */
  70 #define _POSIX_FD_SETSIZE       _POSIX_OPEN_MAX
  71
  72 /* Number of bytes in a filename.  */
  73 #define _POSIX_NAME_MAX         14
  74
  75 /* Number of bytes in a pathname.  */
  76 #define _POSIX_PATH_MAX         256
  77
  78 /* Number of bytes than can be written atomically to a pipe.  */
  79 #define _POSIX_PIPE_BUF         512
  80
  81 /* Minimal number of realtime signals reserved for the application.  */
  82 #define _POSIX_RTSIG_MAX        8
  83
  84 /* Number of semaphores a process can have.  */
  85 #define _POSIX_SEM_NSEMS_MAX    256
  86
  87 /* Maximal value of a semaphore.  */
  88 #define _POSIX_SEM_VALUE_MAX    32767
  89
  90 /* Number of pending realtime signals.  */
  91 #define _POSIX_SIGQUEUE_MAX     32
  92
  93 /* Largest value of a `ssize_t'.  */
  94 #define _POSIX_SSIZE_MAX        32767
  95
  96 /* Number of streams a process can have open at once.  */
  97 #define _POSIX_STREAM_MAX       8
  98
  99 /* Maximum length of a timezone name (element of `tzname').  */
 100 #define _POSIX_TZNAME_MAX       6
 101
 102 /* Maximum number of connections that can be queued on a socket.  */
 103 #define _POSIX_QLIMIT           1
 104
 105 /* Maximum number of bytes that can be buffered on a socket for send
 106    or receive.  */
 107 #define _POSIX_HIWAT            _POSIX_PIPE_BUF
 108
 109 /* Maximum number of elements in an `iovec' array.  */
 110 #define _POSIX_UIO_MAXIOV       16
 111
 112 /* Maximum number of characters in a tty name.  */
 113 #define _POSIX_TTY_NAME_MAX     9
 114
 115 /* Number of timer for a process.  */
 116 #define _POSIX_TIMER_MAX        32
 117
 118 /* Maximum length of login name.  */
 119 #define _POSIX_LOGIN_NAME_MAX   9
 120
 121 /* Maximum clock resolution in nanoseconds.  */
 122 #define _POSIX_CLOCKRES_MIN     20000000
 123
 124
 125 /* Get the implementation-specific values for the above.  */
 126 #include <bits/local_lim.h>
 127
 128
 129 #ifndef SSIZE_MAX
 130 # define SSIZE_MAX      INT_MAX
 131 #endif
 132
 133
 134 /* This value is a guaranteed minimum maximum.
 135    The current maximum can be got from `sysconf'.  */
 136
 137 #ifndef NGROUPS_MAX
 138 # define NGROUPS_MAX    _POSIX_NGROUPS_MAX
 139 #endif
 140
 141 #endif  /* bits/posix1_lim.h  */