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/*
* swclock.c
* Sets the system time from the mtime of the given file.
* This is useful for systems who do not have a working RTC and rely on ntp.
* OpenRC relies on the correct system time for a lot of operations
* so this is needed quite early.
*/
/*
* Copyright (c) 2007-2015 The OpenRC Authors.
* See the Authors file at the top-level directory of this distribution and
* https://github.com/OpenRC/openrc/blob/HEAD/AUTHORS
*
* This file is part of OpenRC. It is subject to the license terms in
* the LICENSE file found in the top-level directory of this
* distribution and at https://github.com/OpenRC/openrc/blob/HEAD/LICENSE
* This file may not be copied, modified, propagated, or distributed
* except according to the terms contained in the LICENSE file.
*/
#include <sys/time.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <unistd.h>
#include <utime.h>
#include <string.h>
#include "einfo.h"
#include "_usage.h"
#include "helpers.h"
const char *applet = NULL;
const char *extraopts = "file";
const char getoptstring[] = "sw" getoptstring_COMMON;
const struct option longopts[] = {
{ "save", 0, NULL, 's' },
{ "warn", 0, NULL, 'w' },
longopts_COMMON
};
const char * const longopts_help[] = {
"saves the time",
"no error if no reference file",
longopts_help_COMMON
};
const char *usagestring = NULL;
int main(int argc, char **argv)
{
int opt, sflag = 0, wflag = 0;
const char *file = NULL;
struct stat sb;
struct timeval tv;
applet = basename_c(argv[0]);
while ((opt = getopt_long(argc, argv, getoptstring,
longopts, (int *) 0)) != -1)
{
switch (opt) {
case 's':
sflag = 1;
break;
case 'w':
wflag = 1;
break;
case_RC_COMMON_GETOPT
}
}
if (optind < argc)
file = argv[optind++];
else
eerrorx("swclock: Reference file was not specified");
if (sflag) {
int fd = open(file, O_WRONLY | O_CREAT, 0644);
if (fd == -1)
eerrorx("swclock: open: %s", strerror(errno));
if (futimens(fd, NULL) == -1)
eerrorx("swclock: futimens: %s", strerror(errno));
close(fd);
return 0;
}
if (stat(file, &sb) == -1) {
if (wflag != 0 && errno == ENOENT)
ewarn("swclock: `%s': %s", file, strerror(errno));
else
eerrorx("swclock: `%s': %s", file, strerror(errno));
return 0;
}
tv.tv_sec = sb.st_mtime;
tv.tv_usec = 0;
if (settimeofday(&tv, NULL) == -1)
eerrorx("swclock: settimeofday: %s", strerror(errno));
return 0;
}
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