sysdeps/unix/bsd/bsd4.4/kfreebsd/fbtl/sysconf.c

   1 /* Get file-specific information about a file.
   2    Copyright (C) 2006 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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 #include <errno.h>
  21 #include <fcntl.h>
  22 #include <stdlib.h>
  23 #include <sysdep.h>
  24 #include <time.h>
  25 #include <unistd.h>
  26 #include <hp-timing.h>
  27 #include <sys/sysctl.h>
  28
  29 static long int posix_sysconf (int name);
  30
  31 /* Get the value of the system variable NAME.  */
  32 long int
  33 __sysconf (int name)
  34 {
  35   int request[2];
  36   int value;
  37   size_t len = sizeof(value);
  38
  39   switch(name)
  40     {
  41       case _SC_CPUTIME:
  42       case _SC_THREAD_CPUTIME:
  43       {
  44         clockid_t clock_id;
  45         /* try whether we have a syscall available */
  46         if ( ENOSYS != INLINE_SYSCALL(clock_getcpuclockid2, 3, 0, CPUCLOCK_WHICH_TID, &clock_id))
  47           return 200809L;
  48         else
  49           return -1;
  50       }
  51       case _SC_NGROUPS_MAX:
  52         request[0] = CTL_KERN;
  53         request[1] = KERN_NGROUPS;
  54         if (__sysctl(request, 2, &value, &len, NULL, 0) == -1)
  55             return NGROUPS_MAX;
  56         return (long)value;
  57       case _SC_ARG_MAX:
  58         request[0] = CTL_KERN;
  59         request[1] = KERN_ARGMAX;
  60         if (__sysctl(request, 2, &value, &len, NULL, 0) == -1)
  61             return ARG_MAX;
  62         return (long)value;
  63     }
  64   return posix_sysconf (name);
  65 }
  66
  67 /* Now the POSIX version.  */
  68 #undef __sysconf
  69 #define __sysconf static posix_sysconf
  70 #include <sysdeps/posix/sysconf.c>