2002-07-21 16:50:49 +00:00
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/* vi: set sw=4 ts=4: */
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/*
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2002-08-05 02:57:12 +00:00
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* Mini hwclock implementation for busybox
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*
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2002-07-21 16:50:49 +00:00
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* Copyright (C) 2002 Robert Griebl <griebl@gmx.de>
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*
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2002-08-05 02:57:12 +00:00
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but 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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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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2002-07-21 16:50:49 +00:00
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2004-02-22 09:11:33 +00:00
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#include <sys/ioctl.h>
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#include <sys/time.h>
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2002-07-21 16:50:49 +00:00
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#include <sys/utsname.h>
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#include <ctype.h>
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#include <fcntl.h>
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2004-02-22 09:11:33 +00:00
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#include <getopt.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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2002-07-21 16:50:49 +00:00
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#include <time.h>
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2004-02-22 09:11:33 +00:00
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#include <unistd.h>
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2002-07-21 16:50:49 +00:00
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#include "busybox.h"
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2002-12-11 03:41:28 +00:00
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/* Copied from linux/rtc.h to eliminate the kernel dependancy */
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2003-01-02 07:16:53 +00:00
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struct linux_rtc_time {
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int tm_sec;
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int tm_min;
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int tm_hour;
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int tm_mday;
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int tm_mon;
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int tm_year;
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int tm_wday;
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int tm_yday;
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int tm_isdst;
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};
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2004-03-15 08:29:22 +00:00
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2003-01-02 07:16:53 +00:00
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#define RTC_SET_TIME _IOW('p', 0x0a, struct linux_rtc_time) /* Set RTC time */
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#define RTC_RD_TIME _IOR('p', 0x09, struct linux_rtc_time) /* Read RTC time */
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2002-12-11 03:41:28 +00:00
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2002-07-21 16:50:49 +00:00
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#ifdef CONFIG_FEATURE_HWCLOCK_LONGOPTIONS
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# ifndef _GNU_SOURCE
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# define _GNU_SOURCE
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# endif
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#endif
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2004-02-22 09:11:33 +00:00
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static time_t read_rtc(int utc)
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2002-07-21 16:50:49 +00:00
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{
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int rtc;
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struct tm tm;
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char *oldtz = 0;
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time_t t = 0;
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if (( rtc = open ( "/dev/rtc", O_RDONLY )) < 0 ) {
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if (( rtc = open ( "/dev/misc/rtc", O_RDONLY )) < 0 )
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2003-03-19 09:13:01 +00:00
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bb_perror_msg_and_die ( "Could not access RTC" );
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2002-07-21 16:50:49 +00:00
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}
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memset ( &tm, 0, sizeof( struct tm ));
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if ( ioctl ( rtc, RTC_RD_TIME, &tm ) < 0 )
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2003-03-19 09:13:01 +00:00
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bb_perror_msg_and_die ( "Could not read time from RTC" );
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2002-07-21 16:50:49 +00:00
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tm. tm_isdst = -1; // not known
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2004-03-15 08:29:22 +00:00
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2002-07-21 16:50:49 +00:00
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close ( rtc );
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2004-03-15 08:29:22 +00:00
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if ( utc ) {
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2002-07-21 16:50:49 +00:00
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oldtz = getenv ( "TZ" );
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setenv ( "TZ", "UTC 0", 1 );
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tzset ( );
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}
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2004-03-15 08:29:22 +00:00
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2002-07-21 16:50:49 +00:00
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t = mktime ( &tm );
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2004-03-15 08:29:22 +00:00
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2002-07-21 16:50:49 +00:00
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if ( utc ) {
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if ( oldtz )
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setenv ( "TZ", oldtz, 1 );
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else
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unsetenv ( "TZ" );
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tzset ( );
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}
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return t;
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}
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2004-02-22 09:11:33 +00:00
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static void write_rtc(time_t t, int utc)
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2002-07-21 16:50:49 +00:00
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{
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int rtc;
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struct tm tm;
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if (( rtc = open ( "/dev/rtc", O_WRONLY )) < 0 ) {
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if (( rtc = open ( "/dev/misc/rtc", O_WRONLY )) < 0 )
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2003-03-19 09:13:01 +00:00
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bb_perror_msg_and_die ( "Could not access RTC" );
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2002-07-21 16:50:49 +00:00
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}
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2004-03-15 08:29:22 +00:00
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2002-07-21 16:50:49 +00:00
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tm = *( utc ? gmtime ( &t ) : localtime ( &t ));
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tm. tm_isdst = 0;
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2004-03-15 08:29:22 +00:00
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2002-07-21 16:50:49 +00:00
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if ( ioctl ( rtc, RTC_SET_TIME, &tm ) < 0 )
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2003-03-19 09:13:01 +00:00
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bb_perror_msg_and_die ( "Could not set the RTC time" );
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2004-03-15 08:29:22 +00:00
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2002-07-21 16:50:49 +00:00
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close ( rtc );
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}
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2004-02-22 09:11:33 +00:00
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static int show_clock(int utc)
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2002-07-21 16:50:49 +00:00
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{
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struct tm *ptm;
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time_t t;
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char buffer [64];
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2004-03-15 08:29:22 +00:00
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t = read_rtc ( utc );
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2002-07-21 16:50:49 +00:00
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ptm = localtime ( &t ); /* Sets 'tzname[]' */
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2004-03-15 08:29:22 +00:00
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2002-07-21 16:50:49 +00:00
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safe_strncpy ( buffer, ctime ( &t ), sizeof( buffer ));
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if ( buffer [0] )
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2003-03-19 09:13:01 +00:00
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buffer [bb_strlen ( buffer ) - 1] = 0;
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2004-03-15 08:29:22 +00:00
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2002-07-21 16:50:49 +00:00
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//printf ( "%s %.6f seconds %s\n", buffer, 0.0, utc ? "" : ( ptm-> tm_isdst ? tzname [1] : tzname [0] ));
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printf ( "%s %.6f seconds\n", buffer, 0.0 );
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2004-03-15 08:29:22 +00:00
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2002-07-21 16:50:49 +00:00
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return 0;
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}
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2004-02-22 09:11:33 +00:00
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static int to_sys_clock(int utc)
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2002-07-21 16:50:49 +00:00
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{
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struct timeval tv = { 0, 0 };
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const struct timezone tz = { timezone/60 - 60*daylight, 0 };
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2004-03-15 08:29:22 +00:00
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2002-07-21 16:50:49 +00:00
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tv. tv_sec = read_rtc ( utc );
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if ( settimeofday ( &tv, &tz ))
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2003-03-19 09:13:01 +00:00
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bb_perror_msg_and_die ( "settimeofday() failed" );
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2002-07-21 16:50:49 +00:00
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return 0;
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}
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2004-02-22 09:11:33 +00:00
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static int from_sys_clock(int utc)
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2002-07-21 16:50:49 +00:00
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{
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struct timeval tv = { 0, 0 };
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struct timezone tz = { 0, 0 };
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if ( gettimeofday ( &tv, &tz ))
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2003-03-19 09:13:01 +00:00
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bb_perror_msg_and_die ( "gettimeofday() failed" );
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2002-07-21 16:50:49 +00:00
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write_rtc ( tv. tv_sec, utc );
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return 0;
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}
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2004-02-22 09:11:33 +00:00
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static int check_utc(void)
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2002-07-21 16:50:49 +00:00
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{
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int utc = 0;
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2004-02-22 08:33:37 +00:00
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FILE *f = fopen ( "/var/lib/hwclock/adjtime", "r" );
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2004-03-15 08:29:22 +00:00
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2002-07-21 16:50:49 +00:00
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if ( f ) {
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char buffer [128];
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2004-03-15 08:29:22 +00:00
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2002-07-21 16:50:49 +00:00
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while ( fgets ( buffer, sizeof( buffer ), f )) {
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2003-03-19 09:13:01 +00:00
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int len = bb_strlen ( buffer );
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2004-03-15 08:29:22 +00:00
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2002-07-21 16:50:49 +00:00
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while ( len && isspace ( buffer [len - 1] ))
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len--;
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2004-03-15 08:29:22 +00:00
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2002-07-21 16:50:49 +00:00
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buffer [len] = 0;
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2004-03-15 08:29:22 +00:00
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2002-07-21 16:50:49 +00:00
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if ( strncmp ( buffer, "UTC", 3 ) == 0 ) {
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utc = 1;
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break;
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}
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}
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fclose ( f );
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}
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return utc;
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}
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2004-02-22 09:11:33 +00:00
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#define HWCLOCK_OPT_LOCALTIME 1
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2004-03-10 10:47:37 +00:00
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#define HWCLOCK_OPT_UTC 2
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#define HWCLOCK_OPT_SHOW 4
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#define HWCLOCK_OPT_HCTOSYS 8
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2004-02-22 09:11:33 +00:00
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#define HWCLOCK_OPT_SYSTOHC 16
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2002-07-21 16:50:49 +00:00
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extern int hwclock_main ( int argc, char **argv )
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{
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2004-02-22 09:11:33 +00:00
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unsigned long opt;
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2002-07-21 16:50:49 +00:00
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int utc = 0;
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#ifdef CONFIG_FEATURE_HWCLOCK_LONGOPTIONS
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2004-02-22 09:11:33 +00:00
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static const struct option hwclock_long_options[] = {
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2002-07-21 16:50:49 +00:00
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{ "localtime", 0, 0, 'l' },
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2004-02-22 09:11:33 +00:00
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{ "utc", 0, 0, 'u' },
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{ "show", 0, 0, 'r' },
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2002-07-21 16:50:49 +00:00
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{ "hctosys", 0, 0, 's' },
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{ "systohc", 0, 0, 'w' },
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{ 0, 0, 0, 0 }
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};
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2004-02-22 09:11:33 +00:00
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bb_applet_long_options = hwclock_long_options;
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2002-07-21 16:50:49 +00:00
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#endif
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2004-02-22 09:11:33 +00:00
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bb_opt_complementaly = "r~ws:w~rs:s~wr";
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opt = bb_getopt_ulflags(argc, argv, "lursw");
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/* Check only one mode was given */
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if(opt & 0x80000000UL) {
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bb_show_usage();
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2002-07-21 16:50:49 +00:00
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}
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2004-02-22 09:11:33 +00:00
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/* If -u or -l wasnt give check if we are using utc */
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if ((opt & (HWCLOCK_OPT_UTC | HWCLOCK_OPT_LOCALTIME)) == 0) {
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utc = check_utc();
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}
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2002-07-21 16:50:49 +00:00
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2004-02-22 09:11:33 +00:00
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if (opt & HWCLOCK_OPT_HCTOSYS) {
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2002-07-21 16:50:49 +00:00
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return to_sys_clock ( utc );
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2004-02-22 09:11:33 +00:00
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}
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else if (opt & HWCLOCK_OPT_SYSTOHC) {
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return from_sys_clock ( utc );
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} else {
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/* default HWCLOCK_OPT_SHOW */
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2004-03-15 08:29:22 +00:00
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return show_clock ( utc );
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2004-02-22 09:11:33 +00:00
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}
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2002-07-21 16:50:49 +00:00
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}
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