include/bits/xopen_lim.h

   1 /* Copyright (C) 1996-2016 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 #define __need_IOV_MAX
  33 #include <bits/stdio_lim.h>
  34
  35 /* We do not provide fixed values for
  36
  37    ARG_MAX      Maximum length of argument to the `exec' function
  38                 including environment data.
  39
  40    ATEXIT_MAX   Maximum number of functions that may be registered
  41                 with `atexit'.
  42
  43    CHILD_MAX    Maximum number of simultaneous processes per real
  44                 user ID.
  45
  46    OPEN_MAX     Maximum number of files that one process can have open
  47                 at anyone time.
  48
  49    PAGESIZE
  50    PAGE_SIZE    Size of bytes of a page.
  51
  52    PASS_MAX     Maximum number of significant bytes in a password.
  53
  54    We only provide a fixed limit for
  55
  56    IOV_MAX      Maximum number of `iovec' structures that one process has
  57                 available for use with `readv' or writev'.
  58
  59    if this is indeed fixed by the underlying system.
  60 */
  61
  62
  63 /* Maximum number of `iovec' structures that one process has available
  64    for use with `readv' or writev'.  */
  65 #define _XOPEN_IOV_MAX  _POSIX_UIO_MAXIOV
  66
  67
  68 /* Maximum value of `digit' in calls to the `printf' and `scanf'
  69    functions.  We have no limit, so return a reasonable value.  */
  70 #define NL_ARGMAX       _POSIX_ARG_MAX
  71
  72 /* Maximum number of bytes in a `LANG' name.  We have no limit.  */
  73 #define NL_LANGMAX      _POSIX2_LINE_MAX
  74
  75 /* Maximum message number.  We have no limit.  */
  76 #define NL_MSGMAX       INT_MAX
  77
  78 /* Maximum number of bytes in N-to-1 collation mapping.  We have no
  79    limit.  */
  80 #define NL_NMAX         INT_MAX
  81
  82 /* Maximum set number.  We have no limit.  */
  83 #define NL_SETMAX       INT_MAX
  84
  85 /* Maximum number of bytes in a message.  We have no limit.  */
  86 #define NL_TEXTMAX      INT_MAX
  87
  88 /* Default process priority.  */
  89 #define NZERO           20
  90
  91
  92 /* Number of bits in a word of type `int'.  */
  93 #ifdef INT_MAX
  94 # if INT_MAX == 32767
  95 #  define WORD_BIT      16
  96 # else
  97 #  if INT_MAX == 2147483647
  98 #   define WORD_BIT     32
  99 #  else
 100 /* Safe assumption.  */
 101 #   define WORD_BIT     64
 102 #  endif
 103 # endif
 104 #elif defined __INT_MAX__
 105 # if __INT_MAX__ == 32767
 106 #  define WORD_BIT      16
 107 # else
 108 #  if __INT_MAX__ == 2147483647
 109 #   define WORD_BIT     32
 110 #  else
 111 /* Safe assumption.  */
 112 #   define WORD_BIT     64
 113 #  endif
 114 # endif
 115 #else
 116 # define WORD_BIT       32
 117 #endif
 118
 119 /* Number of bits in a word of type `long int'.  */
 120 #ifdef LONG_MAX
 121 # if LONG_MAX == 2147483647
 122 #  define LONG_BIT      32
 123 # else
 124 /* Safe assumption.  */
 125 #  define LONG_BIT      64
 126 # endif
 127 #elif defined __LONG_MAX__
 128 # if __LONG_MAX__ == 2147483647
 129 #  define LONG_BIT      32
 130 # else
 131 /* Safe assumption.  */
 132 #  define LONG_BIT      64
 133 # endif
 134 #else
 135 # include <bits/wordsize.h>
 136 # if __WORDSIZE == 64
 137 #  define LONG_BIT      64
 138 # else
 139 #  define LONG_BIT      32
 140 # endif
 141 #endif
 142
 143 #endif /* bits/xopen_lim.h */