93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
/* $NetBSD: clock_settime.c,v 1.2 2001/09/17 23:32:33 thorpej 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 "namespace.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 <fcntl.h>
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#include <paths.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/clockctl.h>
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#ifdef __weak_alias
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__weak_alias(clock_settime,_clock_settime)
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#endif
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int
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clock_settime(clock_id, tp)
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clockid_t clock_id;
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const struct timespec *tp;
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{
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struct clockctl_clock_settime_args args;
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int error;
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int fd;
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quad_t q;
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int rv;
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/*
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* Root always uses the settimeofday syscall
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*/
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if (geteuid() == 0)
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goto try_syscall;
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/*
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* Try to use /dev/clockctl, and revert to
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* settimeofday syscall if it fails.
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*/
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fd = open(_PATH_CLOCKCTL, O_WRONLY, 0);
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if (fd == -1)
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goto try_syscall;
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args.clock_id = clock_id;
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(void)memcpy (&args.tp, tp, sizeof(tp));
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error = ioctl(fd, CLOCKCTL_CLOCK_SETTIME, &args);
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(void)close(fd);
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if (!error)
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return 0;
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try_syscall:
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q = __syscall((quad_t)SYS_clock_settime, clock_id, tp);
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if (/* LINTED constant */ sizeof (quad_t) == sizeof (register_t) ||
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/* LINTED constant */ BYTE_ORDER == LITTLE_ENDIAN)
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rv = (int)q;
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else
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rv = (int)((u_quad_t)q >> 32);
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return rv;
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}
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