35f7216f96
As we default to "hardware clock is in UTC" if /etc/adjtime is not present, it also makes sense to have that default if /etc/adjtime contains only one or two lines. Drop the "gibberish" test case, as this was just EIO because of not containing three lines, which is already contained in other tests. clock_is_localtime() never actually validated the format of the first two lines, and there is little point in doing that. This addresses the reading half of issue #2638.
166 lines
4.4 KiB
C
166 lines
4.4 KiB
C
/***
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This file is part of systemd.
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Copyright 2010-2012 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <time.h>
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#include <linux/rtc.h>
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include "clock-util.h"
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#include "fd-util.h"
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#include "macro.h"
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#include "string-util.h"
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#include "util.h"
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int clock_get_hwclock(struct tm *tm) {
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_cleanup_close_ int fd = -1;
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assert(tm);
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fd = open("/dev/rtc", O_RDONLY|O_CLOEXEC);
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if (fd < 0)
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return -errno;
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/* This leaves the timezone fields of struct tm
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* uninitialized! */
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if (ioctl(fd, RTC_RD_TIME, tm) < 0)
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return -errno;
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/* We don't know daylight saving, so we reset this in order not
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* to confuse mktime(). */
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tm->tm_isdst = -1;
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return 0;
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}
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int clock_set_hwclock(const struct tm *tm) {
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_cleanup_close_ int fd = -1;
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assert(tm);
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fd = open("/dev/rtc", O_RDONLY|O_CLOEXEC);
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if (fd < 0)
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return -errno;
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if (ioctl(fd, RTC_SET_TIME, tm) < 0)
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return -errno;
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return 0;
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}
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int clock_is_localtime(const char* adjtime_path) {
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_cleanup_fclose_ FILE *f;
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if (adjtime_path == NULL)
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adjtime_path = "/etc/adjtime";
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/*
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* The third line of adjtime is "UTC" or "LOCAL" or nothing.
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* # /etc/adjtime
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* 0.0 0 0
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* 0
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* UTC
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*/
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f = fopen(adjtime_path, "re");
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if (f) {
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char line[LINE_MAX];
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bool b;
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b = fgets(line, sizeof(line), f) &&
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fgets(line, sizeof(line), f) &&
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fgets(line, sizeof(line), f);
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if (!b)
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/* less than three lines -> default to UTC */
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return 0;
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truncate_nl(line);
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return streq(line, "LOCAL");
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} else if (errno != ENOENT)
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return -errno;
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/* adjtime not present -> default to UTC */
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return 0;
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}
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int clock_set_timezone(int *min) {
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const struct timeval *tv_null = NULL;
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struct timespec ts;
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struct tm *tm;
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int minutesdelta;
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struct timezone tz;
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assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
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assert_se(tm = localtime(&ts.tv_sec));
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minutesdelta = tm->tm_gmtoff / 60;
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tz.tz_minuteswest = -minutesdelta;
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tz.tz_dsttime = 0; /* DST_NONE */
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/*
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* If the RTC does not run in UTC but in local time, the very first
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* call to settimeofday() will set the kernel's timezone and will warp the
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* system clock, so that it runs in UTC instead of the local time we
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* have read from the RTC.
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*/
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if (settimeofday(tv_null, &tz) < 0)
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return negative_errno();
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if (min)
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*min = minutesdelta;
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return 0;
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}
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int clock_reset_timewarp(void) {
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const struct timeval *tv_null = NULL;
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struct timezone tz;
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tz.tz_minuteswest = 0;
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tz.tz_dsttime = 0; /* DST_NONE */
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/*
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* The very first call to settimeofday() does time warp magic. Do a
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* dummy call here, so the time warping is sealed and all later calls
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* behave as expected.
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*/
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if (settimeofday(tv_null, &tz) < 0)
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return -errno;
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return 0;
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}
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#define TIME_EPOCH_USEC ((usec_t) TIME_EPOCH * USEC_PER_SEC)
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int clock_apply_epoch(void) {
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struct timespec ts;
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if (now(CLOCK_REALTIME) >= TIME_EPOCH_USEC)
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return 0;
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if (clock_settime(CLOCK_REALTIME, timespec_store(&ts, TIME_EPOCH_USEC)) < 0)
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return -errno;
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return 1;
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}
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