blob: 11261f47db889a9b3c55962ee0c2172975e1e20b [file] [log] [blame]
Robert Griebl1cd04452002-07-21 16:50:49 +00001/* vi: set sw=4 ts=4: */
2/*
Robert Griebl6859d762002-08-05 02:57:12 +00003 * Mini hwclock implementation for busybox
4 *
Robert Griebl1cd04452002-07-21 16:50:49 +00005 * Copyright (C) 2002 Robert Griebl <griebl@gmx.de>
6 *
Robert Griebl6859d762002-08-05 02:57:12 +00007 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21*/
Robert Griebl1cd04452002-07-21 16:50:49 +000022
23
Glenn L McGrath689e4b92004-02-22 09:11:33 +000024#include <sys/ioctl.h>
25#include <sys/time.h>
Robert Griebl1cd04452002-07-21 16:50:49 +000026#include <sys/utsname.h>
Robert Griebl1cd04452002-07-21 16:50:49 +000027#include <ctype.h>
28#include <fcntl.h>
Glenn L McGrath689e4b92004-02-22 09:11:33 +000029#include <getopt.h>
30#include <stdlib.h>
31#include <string.h>
32#include <syslog.h>
Robert Griebl1cd04452002-07-21 16:50:49 +000033#include <time.h>
Glenn L McGrath689e4b92004-02-22 09:11:33 +000034#include <unistd.h>
Robert Griebl1cd04452002-07-21 16:50:49 +000035#include "busybox.h"
36
Eric Andersenaff114c2004-04-14 17:51:38 +000037/* Copied from linux/rtc.h to eliminate the kernel dependency */
Robert Griebl7ce75f42003-01-02 07:16:53 +000038struct linux_rtc_time {
39 int tm_sec;
40 int tm_min;
41 int tm_hour;
42 int tm_mday;
43 int tm_mon;
44 int tm_year;
45 int tm_wday;
46 int tm_yday;
47 int tm_isdst;
48};
Mike Frysingerb31566e2005-04-16 04:48:48 +000049
Robert Griebl7ce75f42003-01-02 07:16:53 +000050#define RTC_SET_TIME _IOW('p', 0x0a, struct linux_rtc_time) /* Set RTC time */
51#define RTC_RD_TIME _IOR('p', 0x09, struct linux_rtc_time) /* Read RTC time */
Eric Andersen8882ea52002-12-11 03:41:28 +000052
Robert Griebl1cd04452002-07-21 16:50:49 +000053#ifdef CONFIG_FEATURE_HWCLOCK_LONGOPTIONS
54# ifndef _GNU_SOURCE
55# define _GNU_SOURCE
56# endif
57#endif
58
Glenn L McGrath689e4b92004-02-22 09:11:33 +000059static time_t read_rtc(int utc)
Robert Griebl1cd04452002-07-21 16:50:49 +000060{
61 int rtc;
62 struct tm tm;
63 char *oldtz = 0;
64 time_t t = 0;
65
66 if (( rtc = open ( "/dev/rtc", O_RDONLY )) < 0 ) {
67 if (( rtc = open ( "/dev/misc/rtc", O_RDONLY )) < 0 )
Manuel Novoa III cad53642003-03-19 09:13:01 +000068 bb_perror_msg_and_die ( "Could not access RTC" );
Robert Griebl1cd04452002-07-21 16:50:49 +000069 }
70 memset ( &tm, 0, sizeof( struct tm ));
71 if ( ioctl ( rtc, RTC_RD_TIME, &tm ) < 0 )
Manuel Novoa III cad53642003-03-19 09:13:01 +000072 bb_perror_msg_and_die ( "Could not read time from RTC" );
Robert Griebl1cd04452002-07-21 16:50:49 +000073 tm. tm_isdst = -1; // not known
Eric Andersenc7bda1c2004-03-15 08:29:22 +000074
Robert Griebl1cd04452002-07-21 16:50:49 +000075 close ( rtc );
76
Eric Andersenc7bda1c2004-03-15 08:29:22 +000077 if ( utc ) {
Robert Griebl1cd04452002-07-21 16:50:49 +000078 oldtz = getenv ( "TZ" );
79 setenv ( "TZ", "UTC 0", 1 );
80 tzset ( );
81 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +000082
Robert Griebl1cd04452002-07-21 16:50:49 +000083 t = mktime ( &tm );
Eric Andersenc7bda1c2004-03-15 08:29:22 +000084
Robert Griebl1cd04452002-07-21 16:50:49 +000085 if ( utc ) {
86 if ( oldtz )
87 setenv ( "TZ", oldtz, 1 );
88 else
89 unsetenv ( "TZ" );
90 tzset ( );
91 }
92 return t;
93}
94
Glenn L McGrath689e4b92004-02-22 09:11:33 +000095static void write_rtc(time_t t, int utc)
Robert Griebl1cd04452002-07-21 16:50:49 +000096{
97 int rtc;
98 struct tm tm;
99
100 if (( rtc = open ( "/dev/rtc", O_WRONLY )) < 0 ) {
101 if (( rtc = open ( "/dev/misc/rtc", O_WRONLY )) < 0 )
Manuel Novoa III cad53642003-03-19 09:13:01 +0000102 bb_perror_msg_and_die ( "Could not access RTC" );
Robert Griebl1cd04452002-07-21 16:50:49 +0000103 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000104
Robert Griebl1cd04452002-07-21 16:50:49 +0000105 tm = *( utc ? gmtime ( &t ) : localtime ( &t ));
106 tm. tm_isdst = 0;
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000107
Robert Griebl1cd04452002-07-21 16:50:49 +0000108 if ( ioctl ( rtc, RTC_SET_TIME, &tm ) < 0 )
Manuel Novoa III cad53642003-03-19 09:13:01 +0000109 bb_perror_msg_and_die ( "Could not set the RTC time" );
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000110
Robert Griebl1cd04452002-07-21 16:50:49 +0000111 close ( rtc );
112}
113
Glenn L McGrath689e4b92004-02-22 09:11:33 +0000114static int show_clock(int utc)
Robert Griebl1cd04452002-07-21 16:50:49 +0000115{
116 struct tm *ptm;
117 time_t t;
118 char buffer [64];
119
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000120 t = read_rtc ( utc );
Robert Griebl1cd04452002-07-21 16:50:49 +0000121 ptm = localtime ( &t ); /* Sets 'tzname[]' */
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000122
Robert Griebl1cd04452002-07-21 16:50:49 +0000123 safe_strncpy ( buffer, ctime ( &t ), sizeof( buffer ));
124 if ( buffer [0] )
Manuel Novoa III cad53642003-03-19 09:13:01 +0000125 buffer [bb_strlen ( buffer ) - 1] = 0;
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000126
Robert Griebl1cd04452002-07-21 16:50:49 +0000127 //printf ( "%s %.6f seconds %s\n", buffer, 0.0, utc ? "" : ( ptm-> tm_isdst ? tzname [1] : tzname [0] ));
128 printf ( "%s %.6f seconds\n", buffer, 0.0 );
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000129
Robert Griebl1cd04452002-07-21 16:50:49 +0000130 return 0;
131}
132
Glenn L McGrath689e4b92004-02-22 09:11:33 +0000133static int to_sys_clock(int utc)
Robert Griebl1cd04452002-07-21 16:50:49 +0000134{
135 struct timeval tv = { 0, 0 };
136 const struct timezone tz = { timezone/60 - 60*daylight, 0 };
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000137
Robert Griebl1cd04452002-07-21 16:50:49 +0000138 tv. tv_sec = read_rtc ( utc );
139
140 if ( settimeofday ( &tv, &tz ))
Manuel Novoa III cad53642003-03-19 09:13:01 +0000141 bb_perror_msg_and_die ( "settimeofday() failed" );
Robert Griebl1cd04452002-07-21 16:50:49 +0000142
143 return 0;
144}
145
Glenn L McGrath689e4b92004-02-22 09:11:33 +0000146static int from_sys_clock(int utc)
Robert Griebl1cd04452002-07-21 16:50:49 +0000147{
148 struct timeval tv = { 0, 0 };
149 struct timezone tz = { 0, 0 };
150
151 if ( gettimeofday ( &tv, &tz ))
Manuel Novoa III cad53642003-03-19 09:13:01 +0000152 bb_perror_msg_and_die ( "gettimeofday() failed" );
Robert Griebl1cd04452002-07-21 16:50:49 +0000153
154 write_rtc ( tv. tv_sec, utc );
155 return 0;
156}
157
158
Glenn L McGrath689e4b92004-02-22 09:11:33 +0000159static int check_utc(void)
Robert Griebl1cd04452002-07-21 16:50:49 +0000160{
161 int utc = 0;
Glenn L McGrathf461e012004-02-22 08:33:37 +0000162 FILE *f = fopen ( "/var/lib/hwclock/adjtime", "r" );
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000163
Robert Griebl1cd04452002-07-21 16:50:49 +0000164 if ( f ) {
165 char buffer [128];
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000166
Robert Griebl1cd04452002-07-21 16:50:49 +0000167 while ( fgets ( buffer, sizeof( buffer ), f )) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000168 int len = bb_strlen ( buffer );
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000169
Robert Griebl1cd04452002-07-21 16:50:49 +0000170 while ( len && isspace ( buffer [len - 1] ))
171 len--;
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000172
Robert Griebl1cd04452002-07-21 16:50:49 +0000173 buffer [len] = 0;
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000174
Robert Griebl1cd04452002-07-21 16:50:49 +0000175 if ( strncmp ( buffer, "UTC", 3 ) == 0 ) {
176 utc = 1;
177 break;
178 }
179 }
180 fclose ( f );
181 }
182 return utc;
183}
184
Mike Frysingerb31566e2005-04-16 04:48:48 +0000185#define HWCLOCK_OPT_LOCALTIME 0x01
186#define HWCLOCK_OPT_UTC 0x02
187#define HWCLOCK_OPT_SHOW 0x04
188#define HWCLOCK_OPT_HCTOSYS 0x08
189#define HWCLOCK_OPT_SYSTOHC 0x10
Glenn L McGrath689e4b92004-02-22 09:11:33 +0000190
Robert Griebl1cd04452002-07-21 16:50:49 +0000191extern int hwclock_main ( int argc, char **argv )
192{
Glenn L McGrath689e4b92004-02-22 09:11:33 +0000193 unsigned long opt;
Robert Griebl6bb80872004-03-22 21:27:39 +0000194 int utc;
Robert Griebl1cd04452002-07-21 16:50:49 +0000195
196#ifdef CONFIG_FEATURE_HWCLOCK_LONGOPTIONS
Glenn L McGrath689e4b92004-02-22 09:11:33 +0000197static const struct option hwclock_long_options[] = {
Robert Griebl1cd04452002-07-21 16:50:49 +0000198 { "localtime", 0, 0, 'l' },
Glenn L McGrath689e4b92004-02-22 09:11:33 +0000199 { "utc", 0, 0, 'u' },
200 { "show", 0, 0, 'r' },
Robert Griebl1cd04452002-07-21 16:50:49 +0000201 { "hctosys", 0, 0, 's' },
202 { "systohc", 0, 0, 'w' },
203 { 0, 0, 0, 0 }
204 };
Glenn L McGrath689e4b92004-02-22 09:11:33 +0000205 bb_applet_long_options = hwclock_long_options;
Robert Griebl1cd04452002-07-21 16:50:49 +0000206#endif
Glenn L McGrath689e4b92004-02-22 09:11:33 +0000207
"Vladimir N. Oleynik"27421a12005-09-05 14:46:07 +0000208 bb_opt_complementally = "!r~ws:w~rs:s~wr:l~u:u~l";
Glenn L McGrath689e4b92004-02-22 09:11:33 +0000209 opt = bb_getopt_ulflags(argc, argv, "lursw");
Robert Griebl1cd04452002-07-21 16:50:49 +0000210
Robert Griebl6bb80872004-03-22 21:27:39 +0000211 /* If -u or -l wasn't given check if we are using utc */
Mike Frysingerb31566e2005-04-16 04:48:48 +0000212 if (opt & (HWCLOCK_OPT_UTC | HWCLOCK_OPT_LOCALTIME))
Robert Griebl6bb80872004-03-22 21:27:39 +0000213 utc = opt & HWCLOCK_OPT_UTC;
214 else
Glenn L McGrath689e4b92004-02-22 09:11:33 +0000215 utc = check_utc();
Mike Frysingerb31566e2005-04-16 04:48:48 +0000216
Glenn L McGrath689e4b92004-02-22 09:11:33 +0000217 if (opt & HWCLOCK_OPT_HCTOSYS) {
Robert Griebl1cd04452002-07-21 16:50:49 +0000218 return to_sys_clock ( utc );
Glenn L McGrath689e4b92004-02-22 09:11:33 +0000219 }
220 else if (opt & HWCLOCK_OPT_SYSTOHC) {
221 return from_sys_clock ( utc );
222 } else {
223 /* default HWCLOCK_OPT_SHOW */
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000224 return show_clock ( utc );
Glenn L McGrath689e4b92004-02-22 09:11:33 +0000225 }
Robert Griebl1cd04452002-07-21 16:50:49 +0000226}