88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
|
/* $NetBSD: ntp_adjtime.c,v 1.1 2001/09/16 07:41:58 manu Exp $ */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Copyright (c) 2001 The NetBSD Foundation, Inc.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
||
|
|
* by Emmanuel Dreyfus.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
|
* documentation and/or other materials provided with the distribution.
|
||
|
|
* 3. The name of the author may not be used to endorse or promote products
|
||
|
|
* derived from this software without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
||
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
||
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
||
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
|
|
* SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "namespace.h"
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include <paths.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <sys/timex.h>
|
||
|
|
#include <sys/types.h>
|
||
|
|
#include <sys/ioctl.h>
|
||
|
|
#include <sys/syscall.h>
|
||
|
|
#include <sys/clockctl.h>
|
||
|
|
|
||
|
|
#ifdef __weak_alias
|
||
|
|
__weak_alias(ntp_adjtime,_ntp_adjtime)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
int
|
||
|
|
ntp_adjtime(tp)
|
||
|
|
struct timex *tp;
|
||
|
|
{
|
||
|
|
struct clockctl_ntp_adjtime_args args;
|
||
|
|
int error;
|
||
|
|
int fd;
|
||
|
|
quad_t q;
|
||
|
|
int rv;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Root always uses the adjtime syscall
|
||
|
|
*/
|
||
|
|
if (geteuid() == 0)
|
||
|
|
goto try_syscall;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Try to use /dev/clockctl, and revert to
|
||
|
|
* adjtime syscall if it fails.
|
||
|
|
*/
|
||
|
|
fd = open(_PATH_CLOCKCTL, O_WRONLY, 0);
|
||
|
|
if (fd == -1)
|
||
|
|
goto try_syscall;
|
||
|
|
|
||
|
|
(void)memcpy(&args.tp, tp, sizeof(tp));
|
||
|
|
error = ioctl(fd, CLOCKCTL_NTP_ADJTIME, &args);
|
||
|
|
(void)close(fd);
|
||
|
|
if (!error) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
try_syscall:
|
||
|
|
q = __syscall((quad_t)SYS_ntp_adjtime, tp);
|
||
|
|
if (/* LINTED constant */ sizeof (quad_t) == sizeof (register_t) ||
|
||
|
|
/* LINTED constant */ BYTE_ORDER == LITTLE_ENDIAN)
|
||
|
|
rv = (int)q;
|
||
|
|
else
|
||
|
|
rv = (int)((u_quad_t)q >> 32);
|
||
|
|
return rv;
|
||
|
|
}
|