posix/bits/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 not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 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 /* Maximum length of arguments to `execve', including environment.  */
  32 #define _POSIX_ARG_MAX          4096
  33
  34 /* Maximum simultaneous processes per real user ID.  */
  35 #define _POSIX_CHILD_MAX        6
  36
  37 /* Maximum link count of a file.  */
  38 #define _POSIX_LINK_MAX         8
  39
  40 /* Number of bytes in a terminal canonical input queue.  */
  41 #define _POSIX_MAX_CANON        255
  42
  43 /* Number of bytes for which space will be
  44    available in a terminal input queue.  */
  45 #define _POSIX_MAX_INPUT        255
  46
  47 /* Number of simultaneous supplementary group IDs per process.  */
  48 #define _POSIX_NGROUPS_MAX      0
  49
  50 /* Number of files one process can have open at once.  */
  51 #define _POSIX_OPEN_MAX         16
  52
  53 /* Number of descriptors that a process may examine with `pselect' or
  54    `select'.  */
  55 #define _POSIX_FD_SETSIZE       _POSIX_OPEN_MAX
  56
  57 /* Number of bytes in a filename.  */
  58 #define _POSIX_NAME_MAX         14
  59
  60 /* Number of bytes in a pathname.  */
  61 #define _POSIX_PATH_MAX         255
  62
  63 /* Number of bytes than can be written atomically to a pipe.  */
  64 #define _POSIX_PIPE_BUF         512
  65
  66 /* Largest value of a `ssize_t'.  */
  67 #define _POSIX_SSIZE_MAX        32767
  68
  69 /* Number of streams a process can have open at once.  */
  70 #define _POSIX_STREAM_MAX       8
  71
  72 /* Maximum length of a timezone name (element of `tzname').  */
  73 #define _POSIX_TZNAME_MAX       3
  74
  75 /* Maximum number of connections that can be queued on a socket.  */
  76 #define _POSIX_QLIMIT           1
  77
  78 /* Maximum number of bytes that can be buffered on a socket for send
  79    or receive.  */
  80 #define _POSIX_HIWAT            _POSIX_PIPE_BUF
  81
  82 /* Maximum number of elements in an `iovec' array.  */
  83 #define _POSIX_UIO_MAXIOV       16
  84
  85 /* Maximum number of characters in a tty name.  */
  86 #define _POSIX_TTY_NAME_MAX     9
  87
  88 /* Maximum length of login name.  */
  89 #define _POSIX_LOGIN_NAME_MAX   9
  90
  91
  92 /* Get the implementation-specific values for the above.  */
  93 #include <bits/local_lim.h>
  94
  95
  96 #ifndef SSIZE_MAX
  97 #define SSIZE_MAX       INT_MAX
  98 #endif
  99
 100
 101 /* This value is a guaranteed minimum maximum.
 102    The current maximum can be got from `sysconf'.  */
 103
 104 #ifndef NGROUPS_MAX
 105 #define NGROUPS_MAX     _POSIX_NGROUPS_MAX
 106 #endif
 107
 108 #endif  /* bits/posix1_lim.h  */