sysdeps/unix/bsd/ultrix4/sysconf.c

   1 /* Copyright (C) 1992, 1995, 1996, 1997, 2004 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ian Lance Taylor (ian@airs.com).
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /* On Ultrix we can use the getsysinfo call to get the right return
  21    value for _SC_CHILD_MAX.  Everything else is from <sys/param.h>,
  22    which the default sysconf already knows how to handle.  */
  23
  24 #include <unistd.h>
  25 #include <errno.h>
  26
  27 /* This is an Ultrix header file.  */
  28 #include <sys/sysinfo.h>
  29
  30 extern int __getsysinfo (unsigned int op, void *buffer,
  31                          size_t nbytes, int *start, void *arg);
  32 extern long int __default_sysconf (int name);
  33
  34 long int
  35 __sysconf (name)
  36      int name;
  37 {
  38   if (name == _SC_CHILD_MAX)
  39     {
  40       int save = errno;
  41       int start = 0;
  42       int ret;
  43
  44       /* getsysinfo returns the number of values it put into the
  45          buffer, or 0 if not available, or -1 on error.  */
  46       if (__getsysinfo (GSI_MAX_UPROCS, &ret, sizeof (ret), &start,
  47                         (void *) 0) > 0)
  48         {
  49           __set_errno (save);
  50           return ret;
  51         }
  52
  53       __set_errno (save);
  54     }
  55
  56   return __default_sysconf (name);
  57 }
  58
  59 #define __sysconf __default_sysconf
  60
  61 #include <sysdeps/posix/sysconf.c>