sysctl.c

来自「Glibc 2.3.2源代码(解压后有100多M)」· C语言 代码 · 共 51 行

/* Read or write system information.  Linux version.
   Copyright (C) 1996-1999, 2000, 2002 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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <errno.h>
#include <sys/sysctl.h>

#include <sysdep.h>
#include <sys/syscall.h>
#include <bp-checks.h>

extern int __syscall__sysctl (struct __sysctl_args *__unbounded args);

int
__sysctl (int *name, int nlen, void *oldval, size_t *oldlenp,
	  void *newval, size_t newlen)
{
  /* GKM FIXME: force __sysctl_args decl to have unbounded pointers.  */
  struct __sysctl_args args =
  {
    .name = name,
    .nlen = nlen,
    .oldval = oldval,
    .oldlenp = oldlenp,
    .newval = newval,
    .newlen = newlen
  };
  (void) CHECK_N (name, nlen);
  (void) CHECK_N (oldval, *oldlenp);
  (void) CHECK_N (newval, newlen);

  return INLINE_SYSCALL (_sysctl, 1, __ptrvalue (&args));
}
libc_hidden_def (__sysctl)
weak_alias (__sysctl, sysctl)