sysdeps/unix/sysv/sysv4/sysconf.c

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