sysdeps/unix/sysv/linux/sysctl.c

   1 /* Read or write system information.  Linux version.
   2    Copyright (C) 1996-2000,2002,2003,2005 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 <string.h>     /* For the real memset prototype.  */
  22 #include <sys/sysctl.h>
  23
  24 #include <sysdep.h>
  25 #include <sys/syscall.h>
  26 #include <bp-checks.h>
  27
  28 int
  29 __sysctl (int *name, int nlen, void *oldval, size_t *oldlenp,
  30           void *newval, size_t newlen)
  31 {
  32   /* GKM FIXME: force __sysctl_args decl to have unbounded pointers.  */
  33   struct __sysctl_args args =
  34   {
  35     .name = name,
  36     .nlen = nlen,
  37     .oldval = oldval,
  38     .oldlenp = oldlenp,
  39     .newval = newval,
  40     .newlen = newlen
  41   };
  42   (void) CHECK_N (name, nlen);
  43   (void) CHECK_N (oldval, *oldlenp);
  44   (void) CHECK_N (newval, newlen);
  45
  46   return INLINE_SYSCALL (_sysctl, 1, __ptrvalue (&args));
  47 }
  48 libc_hidden_def (__sysctl)
  49 weak_alias (__sysctl, sysctl)