b200c2aab0
This patch introduces: * _PATH_HWCLOCK_MODE_FILE for clock mode (UTC or LOCAL), default is _PATH_ADJTIME (/etc/adjtime). * _PATH_HWCLOCK_DRIFT_FILE - optional file for clock drift information, the default is /var/lib/hwclock/drift. If the file does not exist than default to _PATH_HWCLOCK_MODE_FILE. The both files use 'adjtime' file format for better backward compatibility. The file /etc/adjtime is de-facto standard and it's used by more 3rd party utils (e.g. systemd). Unfortunately, keep state files in /etc is bad idea. This change makes /etc/adjtime read-only for UTC / LOCAL info and rest is maintained in /var/lib/hwclock/drift. Note that /var/lib/hwclock/drift is not automatically created. It's up to downstream (or system admin) to create the file, for example by: cp /etc/adjtime /var/lib/hwclock/drift otherwise binary will fall back to /etc/adjtime. This idea makes hwclock backwardly compatible and more portable without recompilation. (This patch does not implement changes for hwclock.) Signed-off-by: Karel Zak <kzak@redhat.com>
96 lines
3.2 KiB
C
96 lines
3.2 KiB
C
/***
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First set of functions in this file are part of systemd, and were
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copied to util-linux at August 2013.
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Copyright 2010 Lennart Poettering
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Copyright (C) 2014 Karel Zak <kzak@redhat.com>
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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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#ifndef UTIL_LINUX_TIME_UTIL_H
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#define UTIL_LINUX_TIME_UTIL_H
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#include <stdio.h>
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#include <inttypes.h>
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#include <sys/time.h>
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typedef uint64_t usec_t;
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typedef uint64_t nsec_t;
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#define MSEC_PER_SEC 1000ULL
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#define USEC_PER_SEC 1000000ULL
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#define USEC_PER_MSEC 1000ULL
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#define NSEC_PER_SEC 1000000000ULL
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#define NSEC_PER_MSEC 1000000ULL
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#define NSEC_PER_USEC 1000ULL
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#define USEC_PER_MINUTE (60ULL*USEC_PER_SEC)
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#define NSEC_PER_MINUTE (60ULL*NSEC_PER_SEC)
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#define USEC_PER_HOUR (60ULL*USEC_PER_MINUTE)
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#define NSEC_PER_HOUR (60ULL*NSEC_PER_MINUTE)
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#define USEC_PER_DAY (24ULL*USEC_PER_HOUR)
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#define NSEC_PER_DAY (24ULL*NSEC_PER_HOUR)
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#define USEC_PER_WEEK (7ULL*USEC_PER_DAY)
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#define NSEC_PER_WEEK (7ULL*NSEC_PER_DAY)
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#define USEC_PER_MONTH (2629800ULL*USEC_PER_SEC)
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#define NSEC_PER_MONTH (2629800ULL*NSEC_PER_SEC)
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#define USEC_PER_YEAR (31557600ULL*USEC_PER_SEC)
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#define NSEC_PER_YEAR (31557600ULL*NSEC_PER_SEC)
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#define FORMAT_TIMESTAMP_MAX ((4*4+1)+11+9+4+1) /* weekdays can be unicode */
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#define FORMAT_TIMESTAMP_RELATIVE_MAX 256
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#define FORMAT_TIMESPAN_MAX 64
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int parse_timestamp(const char *t, usec_t *usec);
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int get_gmtoff(const struct tm *tp);
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/* flags and masks for strxxx_iso() functions */
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enum {
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ISO_DATE = (1 << 0),
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ISO_TIME = (1 << 1),
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ISO_TIMEZONE = (1 << 2),
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ISO_DOTUSEC = (1 << 3),
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ISO_COMMAUSEC = (1 << 4),
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ISO_T = (1 << 5),
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ISO_GMTIME = (1 << 6),
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ISO_TIMESTAMP = ISO_DATE | ISO_TIME | ISO_TIMEZONE,
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ISO_TIMESTAMP_T = ISO_TIMESTAMP | ISO_T,
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ISO_TIMESTAMP_DOT = ISO_TIMESTAMP | ISO_DOTUSEC,
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ISO_TIMESTAMP_DOT_T = ISO_TIMESTAMP_DOT | ISO_T,
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ISO_TIMESTAMP_COMMA = ISO_TIMESTAMP | ISO_COMMAUSEC,
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ISO_TIMESTAMP_COMMA_T = ISO_TIMESTAMP_COMMA | ISO_T,
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ISO_TIMESTAMP_COMMA_G = ISO_TIMESTAMP_COMMA | ISO_GMTIME,
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ISO_TIMESTAMP_COMMA_GT = ISO_TIMESTAMP_COMMA_G | ISO_T
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};
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#define CTIME_BUFSIZ 26
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#define ISO_BUFSIZ 42
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int strtimeval_iso(struct timeval *tv, int flags, char *buf, size_t bufsz);
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int strtm_iso(struct tm *tm, int flags, char *buf, size_t bufsz);
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int strtime_iso(const time_t *t, int flags, char *buf, size_t bufsz);
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#define UL_SHORTTIME_THISYEAR_HHMM (1 << 1)
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int strtime_short(const time_t *t, struct timeval *now, int flags, char *buf, size_t bufsz);
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#ifndef HAVE_TIMEGM
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extern time_t timegm(struct tm *tm);
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#endif
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const char *ul_hwclock_get_drift_file(void);
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const char *ul_hwclock_get_mode_file(void);
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int ul_hwclock_mode_is_utc(const char *modefile, int *rc);
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#endif /* UTIL_LINUX_TIME_UTIL_H */
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