120 lines
3.2 KiB
C
120 lines
3.2 KiB
C
/*
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swclock.c
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Sets the system time from the mtime of the given file.
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This is useful for systems who do not have a working RTC and rely on ntp.
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OpenRC relies on the correct system time for a lot of operations so this is needed
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quite early.
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*/
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/*
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* Copyright (c) 2009 Roy Marples <roy@marples.name>
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, 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/time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <unistd.h>
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#include <utime.h>
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#include "builtins.h"
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#include "einfo.h"
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#include "rc-misc.h"
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#define RC_SHUTDOWNTIME RC_SVCDIR "/shutdowntime"
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extern const char *applet;
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#include "_usage.h"
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#define extraopts "file"
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#define getoptstring "sw" getoptstring_COMMON
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static const struct option longopts[] = {
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{ "save", 0, NULL, 's' },
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{ "warn", 0, NULL, 'w' },
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longopts_COMMON
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};
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static const char * const longopts_help[] = {
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"saves the time",
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"no error if no reference file",
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longopts_help_COMMON
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};
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#include "_usage.c"
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int
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swclock(int argc, char **argv)
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{
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int opt, sflag = 0, wflag = 0;
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const char *file = RC_SHUTDOWNTIME;
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struct stat sb;
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struct timeval tv;
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while ((opt = getopt_long(argc, argv, getoptstring,
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longopts, (int *) 0)) != -1)
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{
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switch (opt) {
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case 's':
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sflag = 1;
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break;
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case 'w':
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wflag = 1;
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break;
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case_RC_COMMON_GETOPT
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}
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}
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if (optind < argc)
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file = argv[optind++];
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if (sflag) {
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if (stat(file, &sb) == -1) {
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opt = open(file, O_WRONLY | O_CREAT, 0644);
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if (opt == -1)
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eerrorx("swclock: open: %s", strerror(errno));
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close(opt);
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} else
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if (utime(file, NULL) == -1)
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eerrorx("swclock: utime: %s", strerror(errno));
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return 0;
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}
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if (stat(file, &sb) == -1) {
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if (wflag != 0 && errno == ENOENT)
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ewarn("swclock: `%s': %s", file, strerror(errno));
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else
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eerrorx("swclock: `%s': %s", file, strerror(errno));
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return 0;
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}
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tv.tv_sec = sb.st_mtime;
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tv.tv_usec = 0;
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if (settimeofday(&tv, NULL) == -1)
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eerrorx("swclock: settimeofday: %s", strerror(errno));
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return 0;
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}
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