include/bits/xopen_lim.h

   1 /* Copyright (C) 1996-2018 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  * Never include this file directly; use <limits.h> instead.
  20  */
  21
  22 /* Additional definitions from X/Open Portability Guide, Issue 4, Version 2
  23    System Interfaces and Headers, 4.16 <limits.h>
  24
  25    Please note only the values which are not greater than the minimum
  26    stated in the standard document are listed.  The `sysconf' functions
  27    should be used to obtain the actual value.  */
  28
  29 #ifndef _XOPEN_LIM_H
  30 #define _XOPEN_LIM_H    1
  31
  32 /* We do not provide fixed values for
  33
  34    ARG_MAX      Maximum length of argument to the `exec' function
  35                 including environment data.
  36
  37    ATEXIT_MAX   Maximum number of functions that may be registered
  38                 with `atexit'.
  39
  40    CHILD_MAX    Maximum number of simultaneous processes per real
  41                 user ID.
  42
  43    OPEN_MAX     Maximum number of files that one process can have open
  44                 at anyone time.
  45
  46    PAGESIZE
  47    PAGE_SIZE    Size of bytes of a page.
  48
  49    PASS_MAX     Maximum number of significant bytes in a password.
  50
  51    We only provide a fixed limit for
  52
  53    IOV_MAX      Maximum number of `iovec' structures that one process has
  54                 available for use with `readv' or writev'.
  55
  56    if this is indeed fixed by the underlying system.
  57 */
  58
  59
  60 /* Maximum number of `iovec' structures that may be used in a single call
  61    to `readv', `writev', etc.  */
  62 #define _XOPEN_IOV_MAX  _POSIX_UIO_MAXIOV
  63
  64 #include <bits/uio_lim.h>
  65 #ifdef __IOV_MAX
  66 # define IOV_MAX __IOV_MAX
  67 #else
  68 # undef IOV_MAX
  69 #endif
  70
  71 /* Maximum value of `digit' in calls to the `printf' and `scanf'
  72    functions.  We have no limit, so return a reasonable value.  */
  73 #define NL_ARGMAX       _POSIX_ARG_MAX
  74
  75 /* Maximum number of bytes in a `LANG' name.  We have no limit.  */
  76 #define NL_LANGMAX      _POSIX2_LINE_MAX
  77
  78 /* Maximum message number.  We have no limit.  */
  79 #define NL_MSGMAX       INT_MAX
  80
  81 /* Maximum number of bytes in N-to-1 collation mapping.  We have no
  82    limit.  */
  83 #if defined __USE_GNU || !defined __USE_XOPEN2K8
  84 # define NL_NMAX        INT_MAX
  85 #endif
  86
  87 /* Maximum set number.  We have no limit.  */
  88 #define NL_SETMAX       INT_MAX
  89
  90 /* Maximum number of bytes in a message.  We have no limit.  */
  91 #define NL_TEXTMAX      INT_MAX
  92
  93 /* Default process priority.  */
  94 #define NZERO           20
  95
  96
  97 /* Number of bits in a word of type `int'.  */
  98 #ifdef INT_MAX
  99 # if INT_MAX == 32767
 100 #  define WORD_BIT      16
 101 # else
 102 #  if INT_MAX == 2147483647
 103 #   define WORD_BIT     32
 104 #  else
 105 /* Safe assumption.  */
 106 #   define WORD_BIT     64
 107 #  endif
 108 # endif
 109 #elif defined __INT_MAX__
 110 # if __INT_MAX__ == 32767
 111 #  define WORD_BIT      16
 112 # else
 113 #  if __INT_MAX__ == 2147483647
 114 #   define WORD_BIT     32
 115 #  else
 116 /* Safe assumption.  */
 117 #   define WORD_BIT     64
 118 #  endif
 119 # endif
 120 #else
 121 # define WORD_BIT       32
 122 #endif
 123
 124 /* Number of bits in a word of type `long int'.  */
 125 #ifdef LONG_MAX
 126 # if LONG_MAX == 2147483647
 127 #  define LONG_BIT      32
 128 # else
 129 /* Safe assumption.  */
 130 #  define LONG_BIT      64
 131 # endif
 132 #elif defined __LONG_MAX__
 133 # if __LONG_MAX__ == 2147483647
 134 #  define LONG_BIT      32
 135 # else
 136 /* Safe assumption.  */
 137 #  define LONG_BIT      64
 138 # endif
 139 #else
 140 # include <bits/wordsize.h>
 141 # if __WORDSIZE == 64
 142 #  define LONG_BIT      64
 143 # else
 144 #  define LONG_BIT      32
 145 # endif
 146 #endif
 147
 148 #endif /* bits/xopen_lim.h */