Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
Robert Griebl | 6859d76 | 2002-08-05 02:57:12 +0000 | [diff] [blame] | 3 | * Mini hwclock implementation for busybox |
| 4 | * |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 5 | * Copyright (C) 2002 Robert Griebl <griebl@gmx.de> |
| 6 | * |
Bernhard Reutner-Fischer | 5cf905a | 2006-03-31 22:36:15 +0000 | [diff] [blame] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
Robert Griebl | 6859d76 | 2002-08-05 02:57:12 +0000 | [diff] [blame] | 8 | */ |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 9 | |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 10 | #include <sys/utsname.h> |
Glenn L McGrath | 689e4b9 | 2004-02-22 09:11:33 +0000 | [diff] [blame] | 11 | #include <getopt.h> |
Denis Vlasenko | b6adbf1 | 2007-05-26 19:00:18 +0000 | [diff] [blame] | 12 | #include "libbb.h" |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 13 | |
Eric Andersen | aff114c | 2004-04-14 17:51:38 +0000 | [diff] [blame] | 14 | /* Copied from linux/rtc.h to eliminate the kernel dependency */ |
Robert Griebl | 7ce75f4 | 2003-01-02 07:16:53 +0000 | [diff] [blame] | 15 | struct linux_rtc_time { |
| 16 | int tm_sec; |
| 17 | int tm_min; |
| 18 | int tm_hour; |
| 19 | int tm_mday; |
| 20 | int tm_mon; |
| 21 | int tm_year; |
| 22 | int tm_wday; |
| 23 | int tm_yday; |
| 24 | int tm_isdst; |
| 25 | }; |
Mike Frysinger | b31566e | 2005-04-16 04:48:48 +0000 | [diff] [blame] | 26 | |
Robert Griebl | 7ce75f4 | 2003-01-02 07:16:53 +0000 | [diff] [blame] | 27 | #define RTC_SET_TIME _IOW('p', 0x0a, struct linux_rtc_time) /* Set RTC time */ |
| 28 | #define RTC_RD_TIME _IOR('p', 0x09, struct linux_rtc_time) /* Read RTC time */ |
Eric Andersen | 8882ea5 | 2002-12-11 03:41:28 +0000 | [diff] [blame] | 29 | |
Bernhard Reutner-Fischer | 01d23ad | 2006-05-26 20:19:22 +0000 | [diff] [blame] | 30 | #if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 31 | # ifndef _GNU_SOURCE |
| 32 | # define _GNU_SOURCE |
| 33 | # endif |
| 34 | #endif |
| 35 | |
Denis Vlasenko | 673d4bb | 2007-03-07 23:02:50 +0000 | [diff] [blame] | 36 | static const char *rtcname; |
| 37 | |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 38 | static int xopen_rtc(int flags) |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 39 | { |
| 40 | int rtc; |
Denis Vlasenko | 673d4bb | 2007-03-07 23:02:50 +0000 | [diff] [blame] | 41 | |
| 42 | if (!rtcname) { |
| 43 | rtc = open("/dev/rtc", flags); |
| 44 | if (rtc >= 0) |
| 45 | return rtc; |
| 46 | rtc = open("/dev/rtc0", flags); |
| 47 | if (rtc >= 0) |
| 48 | return rtc; |
| 49 | rtcname = "/dev/misc/rtc"; |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 50 | } |
Denis Vlasenko | 673d4bb | 2007-03-07 23:02:50 +0000 | [diff] [blame] | 51 | return xopen(rtcname, flags); |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 52 | } |
| 53 | |
| 54 | static time_t read_rtc(int utc) |
| 55 | { |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 56 | struct tm tm; |
| 57 | char *oldtz = 0; |
| 58 | time_t t = 0; |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 59 | int rtc = xopen_rtc(O_RDONLY); |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 60 | |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 61 | memset(&tm, 0, sizeof(struct tm)); |
Denis Vlasenko | fb79a2e | 2007-07-14 22:07:14 +0000 | [diff] [blame] | 62 | xioctl(rtc, RTC_RD_TIME, &tm); |
Bernhard Reutner-Fischer | 5cf905a | 2006-03-31 22:36:15 +0000 | [diff] [blame] | 63 | tm.tm_isdst = -1; /* not known */ |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 64 | |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 65 | close(rtc); |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 66 | |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 67 | if (utc) { |
| 68 | oldtz = getenv("TZ"); |
Denis Vlasenko | fb79a2e | 2007-07-14 22:07:14 +0000 | [diff] [blame] | 69 | putenv((char*)"TZ=UTC0"); |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 70 | tzset(); |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 71 | } |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 72 | |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 73 | t = mktime(&tm); |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 74 | |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 75 | if (utc) { |
Denis Vlasenko | fb79a2e | 2007-07-14 22:07:14 +0000 | [diff] [blame] | 76 | unsetenv("TZ"); |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 77 | if (oldtz) |
Denis Vlasenko | fb79a2e | 2007-07-14 22:07:14 +0000 | [diff] [blame] | 78 | putenv(oldtz - 3); |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 79 | tzset(); |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 80 | } |
| 81 | return t; |
| 82 | } |
| 83 | |
Glenn L McGrath | 689e4b9 | 2004-02-22 09:11:33 +0000 | [diff] [blame] | 84 | static void write_rtc(time_t t, int utc) |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 85 | { |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 86 | struct tm tm; |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 87 | int rtc = xopen_rtc(O_WRONLY); |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 88 | |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 89 | tm = *(utc ? gmtime(&t) : localtime(&t)); |
Bernhard Reutner-Fischer | 5cf905a | 2006-03-31 22:36:15 +0000 | [diff] [blame] | 90 | tm.tm_isdst = 0; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 91 | |
Denis Vlasenko | fb79a2e | 2007-07-14 22:07:14 +0000 | [diff] [blame] | 92 | xioctl(rtc, RTC_SET_TIME, &tm); |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 93 | |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 94 | close(rtc); |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 95 | } |
| 96 | |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 97 | static void show_clock(int utc) |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 98 | { |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 99 | //struct tm *ptm; |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 100 | time_t t; |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 101 | char *cp; |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 102 | |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 103 | t = read_rtc(utc); |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 104 | //ptm = localtime(&t); /* Sets 'tzname[]' */ |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 105 | |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 106 | cp = ctime(&t); |
| 107 | if (cp[0]) |
| 108 | cp[strlen(cp) - 1] = '\0'; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 109 | |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 110 | //printf("%s %.6f seconds %s\n", cp, 0.0, utc ? "" : (ptm->tm_isdst ? tzname[1] : tzname[0])); |
| 111 | printf("%s 0.000000 seconds\n", cp); |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 112 | } |
| 113 | |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 114 | static void to_sys_clock(int utc) |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 115 | { |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 116 | struct timeval tv; |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 117 | const struct timezone tz = { timezone/60 - 60*daylight, 0 }; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 118 | |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 119 | tv.tv_sec = read_rtc(utc); |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 120 | tv.tv_usec = 0; |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 121 | if (settimeofday(&tv, &tz)) |
| 122 | bb_perror_msg_and_die("settimeofday() failed"); |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 123 | } |
| 124 | |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 125 | static void from_sys_clock(int utc) |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 126 | { |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 127 | struct timeval tv; |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 128 | |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 129 | gettimeofday(&tv, NULL); |
| 130 | //if (gettimeofday(&tv, NULL)) |
| 131 | // bb_perror_msg_and_die("gettimeofday() failed"); |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 132 | write_rtc(tv.tv_sec, utc); |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 133 | } |
| 134 | |
Mike Frysinger | 747fc5d | 2005-09-28 03:21:21 +0000 | [diff] [blame] | 135 | #ifdef CONFIG_FEATURE_HWCLOCK_ADJTIME_FHS |
| 136 | # define ADJTIME_PATH "/var/lib/hwclock/adjtime" |
| 137 | #else |
| 138 | # define ADJTIME_PATH "/etc/adjtime" |
| 139 | #endif |
Glenn L McGrath | 689e4b9 | 2004-02-22 09:11:33 +0000 | [diff] [blame] | 140 | static int check_utc(void) |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 141 | { |
| 142 | int utc = 0; |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 143 | FILE *f = fopen(ADJTIME_PATH, "r"); |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 144 | |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 145 | if (f) { |
Bernhard Reutner-Fischer | 5cf905a | 2006-03-31 22:36:15 +0000 | [diff] [blame] | 146 | RESERVE_CONFIG_BUFFER(buffer, 128); |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 147 | |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 148 | while (fgets(buffer, sizeof(buffer), f)) { |
| 149 | int len = strlen(buffer); |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 150 | |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 151 | while (len && isspace(buffer[len - 1])) |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 152 | len--; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 153 | |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 154 | buffer[len] = 0; |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 155 | |
Denis Vlasenko | 219d14d | 2007-03-24 15:40:16 +0000 | [diff] [blame] | 156 | if (strncmp(buffer, "UTC", 3) == 0) { |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 157 | utc = 1; |
| 158 | break; |
| 159 | } |
| 160 | } |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 161 | fclose(f); |
Bernhard Reutner-Fischer | 5cf905a | 2006-03-31 22:36:15 +0000 | [diff] [blame] | 162 | RELEASE_CONFIG_BUFFER(buffer); |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 163 | } |
| 164 | return utc; |
| 165 | } |
| 166 | |
Denis Vlasenko | 9225854 | 2006-11-01 10:25:35 +0000 | [diff] [blame] | 167 | #define HWCLOCK_OPT_LOCALTIME 0x01 |
| 168 | #define HWCLOCK_OPT_UTC 0x02 |
| 169 | #define HWCLOCK_OPT_SHOW 0x04 |
| 170 | #define HWCLOCK_OPT_HCTOSYS 0x08 |
| 171 | #define HWCLOCK_OPT_SYSTOHC 0x10 |
Denis Vlasenko | 673d4bb | 2007-03-07 23:02:50 +0000 | [diff] [blame] | 172 | #define HWCLOCK_OPT_RTCFILE 0x20 |
Glenn L McGrath | 689e4b9 | 2004-02-22 09:11:33 +0000 | [diff] [blame] | 173 | |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 174 | int hwclock_main(int argc, char **argv); |
| 175 | int hwclock_main(int argc, char **argv) |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 176 | { |
Denis Vlasenko | 67b23e6 | 2006-10-03 21:00:06 +0000 | [diff] [blame] | 177 | unsigned opt; |
Robert Griebl | 6bb8087 | 2004-03-22 21:27:39 +0000 | [diff] [blame] | 178 | int utc; |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 179 | |
Bernhard Reutner-Fischer | 01d23ad | 2006-05-26 20:19:22 +0000 | [diff] [blame] | 180 | #if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS |
Denis Vlasenko | 6ca409e | 2007-08-12 20:58:27 +0000 | [diff] [blame^] | 181 | static const char hwclock_longopts[] ALIGN1 = |
Denis Vlasenko | bdc88fd | 2007-07-23 17:14:14 +0000 | [diff] [blame] | 182 | "localtime\0" No_argument "l" |
| 183 | "utc\0" No_argument "u" |
| 184 | "show\0" No_argument "r" |
| 185 | "hctosys\0" No_argument "s" |
| 186 | "systohc\0" No_argument "w" |
| 187 | "file\0" Required_argument "f" |
Denis Vlasenko | 990d0f6 | 2007-07-24 15:54:42 +0000 | [diff] [blame] | 188 | ; |
Denis Vlasenko | bdc88fd | 2007-07-23 17:14:14 +0000 | [diff] [blame] | 189 | applet_long_options = hwclock_longopts; |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 190 | #endif |
Denis Vlasenko | 0919657 | 2007-07-21 13:27:44 +0000 | [diff] [blame] | 191 | opt_complementary = "r--ws:w--rs:s--wr:l--u:u--l"; |
Denis Vlasenko | 673d4bb | 2007-03-07 23:02:50 +0000 | [diff] [blame] | 192 | opt = getopt32(argc, argv, "lurswf:", &rtcname); |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 193 | |
Robert Griebl | 6bb8087 | 2004-03-22 21:27:39 +0000 | [diff] [blame] | 194 | /* If -u or -l wasn't given check if we are using utc */ |
Mike Frysinger | b31566e | 2005-04-16 04:48:48 +0000 | [diff] [blame] | 195 | if (opt & (HWCLOCK_OPT_UTC | HWCLOCK_OPT_LOCALTIME)) |
Robert Griebl | 6bb8087 | 2004-03-22 21:27:39 +0000 | [diff] [blame] | 196 | utc = opt & HWCLOCK_OPT_UTC; |
| 197 | else |
Glenn L McGrath | 689e4b9 | 2004-02-22 09:11:33 +0000 | [diff] [blame] | 198 | utc = check_utc(); |
Mike Frysinger | b31566e | 2005-04-16 04:48:48 +0000 | [diff] [blame] | 199 | |
Glenn L McGrath | 689e4b9 | 2004-02-22 09:11:33 +0000 | [diff] [blame] | 200 | if (opt & HWCLOCK_OPT_HCTOSYS) { |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 201 | to_sys_clock(utc); |
| 202 | return 0; |
Glenn L McGrath | 689e4b9 | 2004-02-22 09:11:33 +0000 | [diff] [blame] | 203 | } |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 204 | if (opt & HWCLOCK_OPT_SYSTOHC) { |
| 205 | from_sys_clock(utc); |
| 206 | return 0; |
Glenn L McGrath | 689e4b9 | 2004-02-22 09:11:33 +0000 | [diff] [blame] | 207 | } |
Denis Vlasenko | 459be35 | 2007-06-17 19:09:05 +0000 | [diff] [blame] | 208 | /* default HWCLOCK_OPT_SHOW */ |
| 209 | show_clock(utc); |
| 210 | return 0; |
Robert Griebl | 1cd0445 | 2002-07-21 16:50:49 +0000 | [diff] [blame] | 211 | } |