posix/posix1_lim.h

   1 /* Copyright (C) 1991, 1992, 1993, 1996 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 /*
  20  *      POSIX Standard: 2.9.2 Minimum Values    Added to <limits.h>
  21  */
  22
  23 #ifndef _POSIX1_LIMITS_H
  24
  25 #define _POSIX1_LIMITS_H        1
  26
  27
  28 /* These are the standard-mandated minimum values.  */
  29
  30 /* Maximum length of arguments to `execve', including environment.  */
  31 #define _POSIX_ARG_MAX          4096
  32
  33 /* Maximum simultaneous processes per real user ID.  */
  34 #define _POSIX_CHILD_MAX        6
  35
  36 /* Maximum link count of a file.  */
  37 #define _POSIX_LINK_MAX         8
  38
  39 /* Number of bytes in a terminal canonical input queue.  */
  40 #define _POSIX_MAX_CANON        255
  41
  42 /* Number of bytes for which space will be
  43    available in a terminal input queue.  */
  44 #define _POSIX_MAX_INPUT        255
  45
  46 /* Number of simultaneous supplementary group IDs per process.  */
  47 #define _POSIX_NGROUPS_MAX      0
  48
  49 /* Number of files one process can have open at once.  */
  50 #define _POSIX_OPEN_MAX         16
  51
  52 /* Number of descriptors that a process may examine with `pselect' or
  53    `select'.  */
  54 #define _POSIX_FD_SETSIZE       _POSIX_OPEN_MAX
  55
  56 /* Number of bytes in a filename.  */
  57 #define _POSIX_NAME_MAX         14
  58
  59 /* Number of bytes in a pathname.  */
  60 #define _POSIX_PATH_MAX         255
  61
  62 /* Number of bytes than can be written atomically to a pipe.  */
  63 #define _POSIX_PIPE_BUF         512
  64
  65 /* Largest value of a `ssize_t'.  */
  66 #define _POSIX_SSIZE_MAX        32767
  67
  68 /* Number of streams a process can have open at once.  */
  69 #define _POSIX_STREAM_MAX       8
  70
  71 /* Maximum length of a timezone name (element of `tzname').  */
  72 #define _POSIX_TZNAME_MAX       3
  73
  74 /* Maximum number of connections that can be queued on a socket.  */
  75 #define _POSIX_QLIMIT           1
  76
  77 /* Maximem number of bytes that can be buffered on a socket for send
  78    or receive.  */
  79 #define _POSIX_HIWAT            _POSIX_PIPE_BUF
  80
  81 /* Maximum number of elements in an `iovec' array.  */
  82 #define _POSIX_UIO_MAXIOV       16
  83
  84
  85 /* Get the implementation-specific values for the above.  */
  86 #include <local_lim.h>
  87
  88
  89 #ifndef SSIZE_MAX
  90 #define SSIZE_MAX       INT_MAX
  91 #endif
  92
  93
  94 /* This value is a guaranteed minimum maximum.
  95    The current maximum can be got from `sysconf'.  */
  96
  97 #ifndef NGROUPS_MAX
  98 #define NGROUPS_MAX     _POSIX_NGROUPS_MAX
  99 #endif
 100
 101 #endif  /* posix1_limits.h  */