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       return 60;
  56
  57     case _SC_NGROUPS_MAX:
  58 #ifdef  NGROUPS_MAX
  59       return NGROUPS_MAX;
  60 #else
  61       return -1;
  62 #endif
  63
  64     case _SC_OPEN_MAX:
  65       return __getdtablesize ();
  66
  67     case _SC_STREAM_MAX:
  68       return FOPEN_MAX;
  69
  70     case _SC_TZNAME_MAX:
  71       return __tzname_max ();
  72
  73     case _SC_JOB_CONTROL:
  74 #ifdef  _POSIX_JOB_CONTROL
  75       return 1;
  76 #else
  77       return -1;
  78 #endif
  79     case _SC_SAVED_IDS:
  80 #ifdef  _POSIX_SAVED_IDS
  81       return 1;
  82 #else
  83       return -1;
  84 #endif
  85     case _SC_VERSION:
  86       return _POSIX_VERSION;
  87
  88     case _SC_PAGESIZE:
  89       return __getpagesize ();
  90
  91     case _SC_BC_BASE_MAX:
  92 #ifdef  BC_BASE_MAX
  93       return BC_BASE_MAX;
  94 #else
  95       return -1;
  96 #endif
  97
  98     case _SC_BC_DIM_MAX:
  99 #ifdef  BC_DIM_MAX
 100       return BC_DIM_MAX;
 101 #else
 102       return -1;
 103 #endif
 104
 105     case _SC_BC_SCALE_MAX:
 106 #ifdef  BC_SCALE_MAX
 107       return BC_SCALE_MAX;
 108 #else
 109       return -1;
 110 #endif
 111
 112     case _SC_BC_STRING_MAX:
 113 #ifdef  BC_STRING_MAX
 114       return BC_STRING_MAX;
 115 #else
 116       return -1;
 117 #endif
 118
 119     case _SC_EQUIV_CLASS_MAX:
 120 #ifdef  EQUIV_CLASS_MAX
 121       return EQUIV_CLASS_MAX;
 122 #else
 123       return -1;
 124 #endif
 125
 126     case _SC_EXPR_NEST_MAX:
 127 #ifdef  EXPR_NEST_MAX
 128       return EXPR_NEST_MAX;
 129 #else
 130       return -1;
 131 #endif
 132
 133     case _SC_LINE_MAX:
 134 #ifdef  LINE_MAX
 135       return LINE_MAX;
 136 #else
 137       return -1;
 138 #endif
 139
 140     case _SC_RE_DUP_MAX:
 141 #ifdef  RE_DUP_MAX
 142       return RE_DUP_MAX;
 143 #else
 144       return -1;
 145 #endif
 146
 147
 148     case _SC_2_VERSION:
 149       /* This is actually supposed to return the version
 150          of the 1003.2 utilities on the system {POSIX2_VERSION}.  */
 151       return _POSIX2_C_VERSION;
 152
 153     case _SC_2_C_BIND:
 154 #ifdef  _POSIX2_C_BIND
 155       return _POSIX2_C_BIND;
 156 #else
 157       return -1;
 158 #endif
 159
 160     case _SC_2_C_DEV:
 161 #ifdef  _POSIX2_C_DEV
 162       return _POSIX2_C_DEV;
 163 #else
 164       return -1;
 165 #endif
 166
 167     case _SC_2_FORT_DEV:
 168 #ifdef  _POSIX2_FORT_DEV
 169       return _POSIX2_FORT_DEV;
 170 #else
 171       return -1;
 172 #endif
 173
 174     case _SC_2_SW_DEV:
 175 #ifdef  _POSIX2_SW_DEV
 176       return _POSIX2_SW_DEV;
 177 #else
 178       return -1;
 179 #endif
 180     }
 181 }
 182
 183 weak_alias (__sysconf, sysconf)