linux-sysctl/sysctl.c

/* Read or write system information.  Linux version.
   Copyright (C) 1996-2016 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <sys/sysctl.h>
#include <sys/syscall.h>
#include <unistd.h>

int
sysctl (int *name, int nlen, void *oldval, size_t *oldlenp,
	void *newval, size_t newlen)
{
  struct __sysctl_args args =
  {
    .name = name,
    .nlen = nlen,
    .oldval = oldval,
    .oldlenp = oldlenp,
    .newval = newval,
    .newlen = newlen
  };

  return syscall(SYS__sysctl, &args);
}