sysdeps/unix/bsd/ultrix4/sysconf.c

   1 /* Copyright (C) 1992, 1995, 1996 Free Software Foundation, Inc.
   2    Contributed by Ian Lance Taylor (ian@airs.com).
   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 /* On Ultrix we can use the getsysinfo call to get the right return
  20    value for _SC_CHILD_MAX.  Everything else is from <sys/param.h>,
  21    which the default sysconf already knows how to handle.  */
  22
  23 #include <unistd.h>
  24 #include <errno.h>
  25
  26 /* This is an Ultrix header file.  */
  27 #include <sys/sysinfo.h>
  28
  29 extern int __getsysinfo __P ((unsigned int op, void *buffer,
  30                               size_t nbytes, int *start, void *arg));
  31 extern long int __default_sysconf __P ((int name));
  32
  33 long int
  34 __sysconf (name)
  35      int name;
  36 {
  37   if (name == _SC_CHILD_MAX)
  38     {
  39       int save = errno;
  40       int start = 0;
  41       int ret;
  42
  43       /* getsysinfo returns the number of values it put into the
  44          buffer, or 0 if not available, or -1 on error.  */
  45       if (__getsysinfo (GSI_MAX_UPROCS, &ret, sizeof (ret), &start,
  46                         (void *) 0) > 0)
  47         {
  48           __set_errno (save);
  49           return ret;
  50         }
  51
  52       __set_errno (save);
  53     }
  54
  55   return __default_sysconf (name);
  56 }
  57
  58 #define __sysconf __default_sysconf
  59
  60 #include <sysdeps/posix/sysconf.c>