diff options
Diffstat (limited to 'src/shared/hwclock.c')
| -rw-r--r-- | src/shared/hwclock.c | 240 |
1 files changed, 0 insertions, 240 deletions
diff --git a/src/shared/hwclock.c b/src/shared/hwclock.c deleted file mode 100644 index f9adf0369e..0000000000 --- a/src/shared/hwclock.c +++ /dev/null @@ -1,240 +0,0 @@ -/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ - -/*** - This file is part of systemd. - - Copyright 2010-2012 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, or - (at your option) any later version. - - systemd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see <http://www.gnu.org/licenses/>. -***/ - -#include <assert.h> -#include <string.h> -#include <unistd.h> -#include <errno.h> -#include <stdlib.h> -#include <signal.h> -#include <stdio.h> -#include <sys/types.h> -#include <sys/stat.h> -#include <fcntl.h> -#include <sys/ioctl.h> -#include <stdarg.h> -#include <ctype.h> -#include <sys/prctl.h> -#include <sys/time.h> -#include <linux/rtc.h> - -#include "macro.h" -#include "util.h" -#include "log.h" -#include "strv.h" -#include "hwclock.h" - -static int rtc_open(int flags) { - int fd; - DIR *d; - - /* First, we try to make use of the /dev/rtc symlink. If that - * doesn't exist, we open the first RTC which has hctosys=1 - * set. If we don't find any we just take the first RTC that - * exists at all. */ - - fd = open("/dev/rtc", flags); - if (fd >= 0) - return fd; - - d = opendir("/sys/class/rtc"); - if (!d) - goto fallback; - - for (;;) { - char *p, *v; - struct dirent *de; - union dirent_storage buf; - int r; - - r = readdir_r(d, &buf.de, &de); - if (r != 0) - goto fallback; - - if (!de) - goto fallback; - - if (ignore_file(de->d_name)) - continue; - - p = strjoin("/sys/class/rtc/", de->d_name, "/hctosys", NULL); - if (!p) { - closedir(d); - return -ENOMEM; - } - - r = read_one_line_file(p, &v); - free(p); - - if (r < 0) - continue; - - r = parse_boolean(v); - free(v); - - if (r <= 0) - continue; - - p = strappend("/dev/", de->d_name); - if (!p) { - closedir(d); - return -ENOMEM; - } - - fd = open(p, flags); - free(p); - - if (fd >= 0) { - closedir(d); - return fd; - } - } - -fallback: - if (d) - closedir(d); - - fd = open("/dev/rtc0", flags); - if (fd < 0) - return -errno; - - return fd; -} - -int hwclock_get_time(struct tm *tm) { - int fd; - int err = 0; - - assert(tm); - - fd = rtc_open(O_RDONLY|O_CLOEXEC); - if (fd < 0) - return -errno; - - /* This leaves the timezone fields of struct tm - * uninitialized! */ - if (ioctl(fd, RTC_RD_TIME, tm) < 0) - err = -errno; - - /* We don't know daylight saving, so we reset this in order not - * to confused mktime(). */ - tm->tm_isdst = -1; - - close_nointr_nofail(fd); - - return err; -} - -int hwclock_set_time(const struct tm *tm) { - int fd; - int err = 0; - - assert(tm); - - fd = rtc_open(O_RDONLY|O_CLOEXEC); - if (fd < 0) - return -errno; - - if (ioctl(fd, RTC_SET_TIME, tm) < 0) - err = -errno; - - close_nointr_nofail(fd); - - return err; -} - -int hwclock_is_localtime(void) { - FILE *f; - bool local = false; - - /* - * The third line of adjtime is "UTC" or "LOCAL" or nothing. - * # /etc/adjtime - * 0.0 0 0 - * 0 - * UTC - */ - f = fopen("/etc/adjtime", "re"); - if (f) { - char line[LINE_MAX]; - bool b; - - b = fgets(line, sizeof(line), f) && - fgets(line, sizeof(line), f) && - fgets(line, sizeof(line), f); - - fclose(f); - - if (!b) - return -EIO; - - truncate_nl(line); - local = streq(line, "LOCAL"); - - } else if (errno != -ENOENT) - return -errno; - - return local; -} - -int hwclock_set_timezone(int *min) { - const struct timeval *tv_null = NULL; - struct timespec ts; - struct tm *tm; - int minutesdelta; - struct timezone tz; - - assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0); - assert_se(tm = localtime(&ts.tv_sec)); - minutesdelta = tm->tm_gmtoff / 60; - - tz.tz_minuteswest = -minutesdelta; - tz.tz_dsttime = 0; /* DST_NONE*/ - - /* - * If the hardware clock does not run in UTC, but in local time: - * The very first time we set the kernel's timezone, it will warp - * the clock so that it runs in UTC instead of local time. - */ - if (settimeofday(tv_null, &tz) < 0) - return -errno; - if (min) - *min = minutesdelta; - return 0; -} - -int hwclock_reset_timezone(void) { - const struct timeval *tv_null = NULL; - struct timezone tz; - - tz.tz_minuteswest = 0; - tz.tz_dsttime = 0; /* DST_NONE*/ - - /* - * The very first time we set the kernel's timezone, it will warp - * the clock. Do a dummy call here, so the time warping is sealed - * and we set only the time zone with next call. - */ - if (settimeofday(tv_null, &tz) < 0) - return -errno; - - return 0; -} |