sysdeps/posix/sysconf.c

   1 /* Copyright (C) 1991, 1993, 1995 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 #include <ansidecl.h>
  20 #include <errno.h>
  21 #include <limits.h>
  22 #include <unistd.h>
  23 #include <stddef.h>
  24 #include <stdio.h>
  25 #include <time.h>
  26
  27 extern int EXFUN(__getdtablesize, (NOARGS));
  28 extern size_t EXFUN(__getpagesize, (NOARGS));
  29
  30 /* Get the value of the system variable NAME.  */
  31 long int
  32 DEFUN(__sysconf, (name), int name)
  33 {
  34   switch (name)
  35     {
  36     default:
  37       errno = EINVAL;
  38       return -1;
  39
  40     case _SC_ARG_MAX:
  41 #ifdef  ARG_MAX
  42       return ARG_MAX;
  43 #else
  44       return -1;
  45 #endif
  46
  47     case _SC_CHILD_MAX:
  48 #ifdef  CHILD_MAX
  49       return CHILD_MAX;
  50 #else
  51       return -1;
  52 #endif
  53
  54     case _SC_CLK_TCK:
  55 #ifdef  CLK_TCK
  56       return CLK_TCK;
  57 #else
  58       return 60;
  59 #endif
  60
  61     case _SC_NGROUPS_MAX:
  62 #ifdef  NGROUPS_MAX
  63       return NGROUPS_MAX;
  64 #else
  65       return -1;
  66 #endif
  67
  68     case _SC_OPEN_MAX:
  69       return __getdtablesize ();
  70
  71     case _SC_STREAM_MAX:
  72 #ifdef  STREAM_MAX
  73       return STREAM_MAX;
  74 #else
  75       return FOPEN_MAX;
  76 #endif
  77
  78     case _SC_TZNAME_MAX:
  79       return __tzname_max ();
  80
  81     case _SC_JOB_CONTROL:
  82 #ifdef  _POSIX_JOB_CONTROL
  83       return 1;
  84 #else
  85       return -1;
  86 #endif
  87     case _SC_SAVED_IDS:
  88 #ifdef  _POSIX_SAVED_IDS
  89       return 1;
  90 #else
  91       return -1;
  92 #endif
  93     case _SC_VERSION:
  94       return _POSIX_VERSION;
  95
  96     case _SC_PAGESIZE:
  97       return __getpagesize ();
  98
  99     case _SC_BC_BASE_MAX:
 100 #ifdef  BC_BASE_MAX
 101       return BC_BASE_MAX;
 102 #else
 103       return -1;
 104 #endif
 105
 106     case _SC_BC_DIM_MAX:
 107 #ifdef  BC_DIM_MAX
 108       return BC_DIM_MAX;
 109 #else
 110       return -1;
 111 #endif
 112
 113     case _SC_BC_SCALE_MAX:
 114 #ifdef  BC_SCALE_MAX
 115       return BC_SCALE_MAX;
 116 #else
 117       return -1;
 118 #endif
 119
 120     case _SC_BC_STRING_MAX:
 121 #ifdef  BC_STRING_MAX
 122       return BC_STRING_MAX;
 123 #else
 124       return -1;
 125 #endif
 126
 127     case _SC_EQUIV_CLASS_MAX:
 128 #ifdef  EQUIV_CLASS_MAX
 129       return EQUIV_CLASS_MAX;
 130 #else
 131       return -1;
 132 #endif
 133
 134     case _SC_EXPR_NEST_MAX:
 135 #ifdef  EXPR_NEST_MAX
 136       return EXPR_NEST_MAX;
 137 #else
 138       return -1;
 139 #endif
 140
 141     case _SC_LINE_MAX:
 142 #ifdef  LINE_MAX
 143       return LINE_MAX;
 144 #else
 145       return -1;
 146 #endif
 147
 148     case _SC_RE_DUP_MAX:
 149 #ifdef  RE_DUP_MAX
 150       return RE_DUP_MAX;
 151 #else
 152       return -1;
 153 #endif
 154
 155
 156     case _SC_2_VERSION:
 157       /* This is actually supposed to return the version
 158          of the 1003.2 utilities on the system {POSIX2_VERSION}.  */
 159       return _POSIX2_C_VERSION;
 160
 161     case _SC_2_C_BIND:
 162 #ifdef  _POSIX2_C_BIND
 163       return _POSIX2_C_BIND;
 164 #else
 165       return -1;
 166 #endif
 167
 168     case _SC_2_C_DEV:
 169 #ifdef  _POSIX2_C_DEV
 170       return _POSIX2_C_DEV;
 171 #else
 172       return -1;
 173 #endif
 174
 175     case _SC_2_FORT_DEV:
 176 #ifdef  _POSIX2_FORT_DEV
 177       return _POSIX2_FORT_DEV;
 178 #else
 179       return -1;
 180 #endif
 181
 182     case _SC_2_LOCALEDEF:
 183 #ifdef  _POSIX2_LOCALEDEF
 184       return _POSIX2_LOCALEDEF;
 185 #else
 186       return -1;
 187 #endif
 188
 189     case _SC_2_SW_DEV:
 190 #ifdef  _POSIX2_SW_DEV
 191       return _POSIX2_SW_DEV;
 192 #else
 193       return -1;
 194 #endif
 195     }
 196 }
 197
 198 weak_alias (__sysconf, sysconf)