LCOV - code coverage report
Current view: top level - basic - clock-util.c (source / functions) Hit Total Coverage
Test: systemd test coverage Lines: 0 52 0.0 %
Date: 2015-07-29 18:47:03 Functions: 0 5 0.0 %

          Line data    Source code
       1             : /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
       2             : 
       3             : /***
       4             :   This file is part of systemd.
       5             : 
       6             :   Copyright 2010-2012 Lennart Poettering
       7             : 
       8             :   systemd is free software; you can redistribute it and/or modify it
       9             :   under the terms of the GNU Lesser General Public License as published by
      10             :   the Free Software Foundation; either version 2.1 of the License, or
      11             :   (at your option) any later version.
      12             : 
      13             :   systemd is distributed in the hope that it will be useful, but
      14             :   WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
      16             :   Lesser General Public License for more details.
      17             : 
      18             :   You should have received a copy of the GNU Lesser General Public License
      19             :   along with systemd; If not, see <http://www.gnu.org/licenses/>.
      20             : ***/
      21             : 
      22             : #include <errno.h>
      23             : #include <stdio.h>
      24             : #include <fcntl.h>
      25             : #include <sys/ioctl.h>
      26             : #include <sys/time.h>
      27             : #include <linux/rtc.h>
      28             : 
      29             : #include "macro.h"
      30             : #include "util.h"
      31             : #include "clock-util.h"
      32             : 
      33           0 : int clock_get_hwclock(struct tm *tm) {
      34           0 :         _cleanup_close_ int fd = -1;
      35             : 
      36           0 :         assert(tm);
      37             : 
      38           0 :         fd = open("/dev/rtc", O_RDONLY|O_CLOEXEC);
      39           0 :         if (fd < 0)
      40           0 :                 return -errno;
      41             : 
      42             :         /* This leaves the timezone fields of struct tm
      43             :          * uninitialized! */
      44           0 :         if (ioctl(fd, RTC_RD_TIME, tm) < 0)
      45           0 :                 return -errno;
      46             : 
      47             :         /* We don't know daylight saving, so we reset this in order not
      48             :          * to confuse mktime(). */
      49           0 :         tm->tm_isdst = -1;
      50             : 
      51           0 :         return 0;
      52             : }
      53             : 
      54           0 : int clock_set_hwclock(const struct tm *tm) {
      55           0 :         _cleanup_close_ int fd = -1;
      56             : 
      57           0 :         assert(tm);
      58             : 
      59           0 :         fd = open("/dev/rtc", O_RDONLY|O_CLOEXEC);
      60           0 :         if (fd < 0)
      61           0 :                 return -errno;
      62             : 
      63           0 :         if (ioctl(fd, RTC_SET_TIME, tm) < 0)
      64           0 :                 return -errno;
      65             : 
      66           0 :         return 0;
      67             : }
      68             : 
      69           0 : int clock_is_localtime(void) {
      70           0 :         _cleanup_fclose_ FILE *f;
      71             : 
      72             :         /*
      73             :          * The third line of adjtime is "UTC" or "LOCAL" or nothing.
      74             :          *   # /etc/adjtime
      75             :          *   0.0 0 0
      76             :          *   0
      77             :          *   UTC
      78             :          */
      79           0 :         f = fopen("/etc/adjtime", "re");
      80           0 :         if (f) {
      81             :                 char line[LINE_MAX];
      82             :                 bool b;
      83             : 
      84           0 :                 b = fgets(line, sizeof(line), f) &&
      85           0 :                         fgets(line, sizeof(line), f) &&
      86           0 :                         fgets(line, sizeof(line), f);
      87           0 :                 if (!b)
      88           0 :                         return -EIO;
      89             : 
      90           0 :                 truncate_nl(line);
      91           0 :                 return streq(line, "LOCAL");
      92             : 
      93           0 :         } else if (errno != ENOENT)
      94           0 :                 return -errno;
      95             : 
      96           0 :         return 0;
      97             : }
      98             : 
      99           0 : int clock_set_timezone(int *min) {
     100           0 :         const struct timeval *tv_null = NULL;
     101             :         struct timespec ts;
     102             :         struct tm *tm;
     103             :         int minutesdelta;
     104             :         struct timezone tz;
     105             : 
     106           0 :         assert_se(clock_gettime(CLOCK_REALTIME, &ts) == 0);
     107           0 :         assert_se(tm = localtime(&ts.tv_sec));
     108           0 :         minutesdelta = tm->tm_gmtoff / 60;
     109             : 
     110           0 :         tz.tz_minuteswest = -minutesdelta;
     111           0 :         tz.tz_dsttime = 0; /* DST_NONE */
     112             : 
     113             :         /*
     114             :          * If the RTC does not run in UTC but in local time, the very first
     115             :          * call to settimeofday() will set the kernel's timezone and will warp the
     116             :          * system clock, so that it runs in UTC instead of the local time we
     117             :          * have read from the RTC.
     118             :          */
     119           0 :         if (settimeofday(tv_null, &tz) < 0)
     120           0 :                 return -errno;
     121           0 :         if (min)
     122           0 :                 *min = minutesdelta;
     123           0 :         return 0;
     124             : }
     125             : 
     126           0 : int clock_reset_timewarp(void) {
     127           0 :         const struct timeval *tv_null = NULL;
     128             :         struct timezone tz;
     129             : 
     130           0 :         tz.tz_minuteswest = 0;
     131           0 :         tz.tz_dsttime = 0; /* DST_NONE */
     132             : 
     133             :         /*
     134             :          * The very first call to settimeofday() does time warp magic. Do a
     135             :          * dummy call here, so the time warping is sealed and all later calls
     136             :          * behave as expected.
     137             :          */
     138           0 :         if (settimeofday(tv_null, &tz) < 0)
     139           0 :                 return -errno;
     140             : 
     141           0 :         return 0;
     142             : }

Generated by: LCOV version 1.11