97 lines
3.0 KiB
C
97 lines
3.0 KiB
C
/* $NetBSD: adjtime.c,v 1.11 2009/01/11 02:46:30 christos Exp $ */
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/*
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Emmanuel Dreyfus.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: adjtime.c,v 1.11 2009/01/11 02:46:30 christos Exp $");
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <unistd.h>
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#include <time.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/syscall.h>
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#include <sys/clockctl.h>
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extern int __clockctl_fd;
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int ____adjtime50(const struct timeval *, struct timeval *);
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int
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adjtime(const struct timeval *delta, struct timeval *olddelta)
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{
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struct clockctl_adjtime args;
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int rv;
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/*
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* we always attempt the syscall first and switch to
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* clockctl if that fails with EPERM
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*/
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if (__clockctl_fd == -1) {
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rv = ____adjtime50(delta, olddelta);
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/*
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* try via clockctl if the call fails with EPERM
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*/
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if (rv != -1 || errno != EPERM)
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return rv;
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/*
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* If this fails, it means that we are not root
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* and we cannot open clockctl. This is a failure.
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*/
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__clockctl_fd = open(_PATH_CLOCKCTL, O_WRONLY, 0);
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if (__clockctl_fd == -1) {
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/* original error was EPERM - don't leak open errors */
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errno = EPERM;
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return -1;
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}
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(void) fcntl(__clockctl_fd, F_SETFD, FD_CLOEXEC);
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}
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/*
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* If __clockctl_fd >=0, clockctl has already been open
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* and used, so we carry on using it.
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*/
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args.delta = delta;
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args.olddelta = olddelta;
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return ioctl(__clockctl_fd, CLOCKCTL_ADJTIME, &args);
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}
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