| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini hwclock implementation for busybox |
| * |
| * Copyright (C) 2002 Robert Griebl <griebl@gmx.de> |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
| */ |
| |
| |
| #include <sys/ioctl.h> |
| #include <sys/utsname.h> |
| #include <getopt.h> |
| #include "libbb.h" |
| |
| /* Copied from linux/rtc.h to eliminate the kernel dependency */ |
| struct linux_rtc_time { |
| int tm_sec; |
| int tm_min; |
| int tm_hour; |
| int tm_mday; |
| int tm_mon; |
| int tm_year; |
| int tm_wday; |
| int tm_yday; |
| int tm_isdst; |
| }; |
| |
| #define RTC_SET_TIME _IOW('p', 0x0a, struct linux_rtc_time) /* Set RTC time */ |
| #define RTC_RD_TIME _IOR('p', 0x09, struct linux_rtc_time) /* Read RTC time */ |
| |
| #if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS |
| # ifndef _GNU_SOURCE |
| # define _GNU_SOURCE |
| # endif |
| #endif |
| |
| static const char *rtcname; |
| |
| static int xopen_rtc(int flags) |
| { |
| int rtc; |
| |
| if (!rtcname) { |
| rtc = open("/dev/rtc", flags); |
| if (rtc >= 0) |
| return rtc; |
| rtc = open("/dev/rtc0", flags); |
| if (rtc >= 0) |
| return rtc; |
| rtcname = "/dev/misc/rtc"; |
| } |
| return xopen(rtcname, flags); |
| } |
| |
| static time_t read_rtc(int utc) |
| { |
| struct tm tm; |
| char *oldtz = 0; |
| time_t t = 0; |
| int rtc = xopen_rtc(O_RDONLY); |
| |
| memset(&tm, 0, sizeof(struct tm)); |
| if (ioctl(rtc, RTC_RD_TIME, &tm) < 0) |
| bb_perror_msg_and_die("cannot read time from RTC"); |
| tm.tm_isdst = -1; /* not known */ |
| |
| close(rtc); |
| |
| if (utc) { |
| oldtz = getenv("TZ"); |
| setenv("TZ", "UTC 0", 1); |
| tzset(); |
| } |
| |
| t = mktime(&tm); |
| |
| if (utc) { |
| if (oldtz) |
| setenv("TZ", oldtz, 1); |
| else |
| unsetenv("TZ"); |
| tzset(); |
| } |
| return t; |
| } |
| |
| static void write_rtc(time_t t, int utc) |
| { |
| struct tm tm; |
| int rtc = xopen_rtc(O_WRONLY); |
| |
| tm = *(utc ? gmtime(&t) : localtime(&t)); |
| tm.tm_isdst = 0; |
| |
| if (ioctl(rtc, RTC_SET_TIME, &tm) < 0) |
| bb_perror_msg_and_die("cannot set the RTC time"); |
| |
| close(rtc); |
| } |
| |
| static int show_clock(int utc) |
| { |
| struct tm *ptm; |
| time_t t; |
| RESERVE_CONFIG_BUFFER(buffer, 64); |
| |
| t = read_rtc(utc); |
| ptm = localtime(&t); /* Sets 'tzname[]' */ |
| |
| safe_strncpy(buffer, ctime(&t), 64); |
| if (buffer[0]) |
| buffer[strlen(buffer) - 1] = 0; |
| |
| //printf("%s %.6f seconds %s\n", buffer, 0.0, utc ? "" : (ptm->tm_isdst ? tzname[1] : tzname[0])); |
| printf( "%s %.6f seconds\n", buffer, 0.0); |
| RELEASE_CONFIG_BUFFER(buffer); |
| |
| return 0; |
| } |
| |
| static int to_sys_clock(int utc) |
| { |
| struct timeval tv = { 0, 0 }; |
| const struct timezone tz = { timezone/60 - 60*daylight, 0 }; |
| |
| tv.tv_sec = read_rtc(utc); |
| |
| if (settimeofday(&tv, &tz)) |
| bb_perror_msg_and_die("settimeofday() failed"); |
| |
| return 0; |
| } |
| |
| static int from_sys_clock(int utc) |
| { |
| struct timeval tv = { 0, 0 }; |
| struct timezone tz = { 0, 0 }; |
| |
| if (gettimeofday(&tv, &tz)) |
| bb_perror_msg_and_die("gettimeofday() failed"); |
| |
| write_rtc(tv.tv_sec, utc); |
| return 0; |
| } |
| |
| #ifdef CONFIG_FEATURE_HWCLOCK_ADJTIME_FHS |
| # define ADJTIME_PATH "/var/lib/hwclock/adjtime" |
| #else |
| # define ADJTIME_PATH "/etc/adjtime" |
| #endif |
| static int check_utc(void) |
| { |
| int utc = 0; |
| FILE *f = fopen(ADJTIME_PATH, "r"); |
| |
| if (f) { |
| RESERVE_CONFIG_BUFFER(buffer, 128); |
| |
| while (fgets(buffer, sizeof(buffer), f)) { |
| int len = strlen(buffer); |
| |
| while (len && isspace(buffer[len - 1])) |
| len--; |
| |
| buffer[len] = 0; |
| |
| if (strncmp(buffer, "UTC", 3) == 0) { |
| utc = 1; |
| break; |
| } |
| } |
| fclose(f); |
| RELEASE_CONFIG_BUFFER(buffer); |
| } |
| return utc; |
| } |
| |
| #define HWCLOCK_OPT_LOCALTIME 0x01 |
| #define HWCLOCK_OPT_UTC 0x02 |
| #define HWCLOCK_OPT_SHOW 0x04 |
| #define HWCLOCK_OPT_HCTOSYS 0x08 |
| #define HWCLOCK_OPT_SYSTOHC 0x10 |
| #define HWCLOCK_OPT_RTCFILE 0x20 |
| |
| int hwclock_main(int argc, char **argv ); |
| int hwclock_main(int argc, char **argv ) |
| { |
| unsigned opt; |
| int utc; |
| |
| #if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS |
| static const struct option hwclock_long_options[] = { |
| { "localtime", 0, 0, 'l' }, |
| { "utc", 0, 0, 'u' }, |
| { "show", 0, 0, 'r' }, |
| { "hctosys", 0, 0, 's' }, |
| { "systohc", 0, 0, 'w' }, |
| { "file", 1, 0, 'f' }, |
| { 0, 0, 0, 0 } |
| }; |
| applet_long_options = hwclock_long_options; |
| #endif |
| opt_complementary = "?:r--ws:w--rs:s--wr:l--u:u--l"; |
| opt = getopt32(argc, argv, "lurswf:", &rtcname); |
| |
| /* If -u or -l wasn't given check if we are using utc */ |
| if (opt & (HWCLOCK_OPT_UTC | HWCLOCK_OPT_LOCALTIME)) |
| utc = opt & HWCLOCK_OPT_UTC; |
| else |
| utc = check_utc(); |
| |
| if (opt & HWCLOCK_OPT_HCTOSYS) { |
| return to_sys_clock(utc); |
| } |
| else if (opt & HWCLOCK_OPT_SYSTOHC) { |
| return from_sys_clock(utc); |
| } else { |
| /* default HWCLOCK_OPT_SHOW */ |
| return show_clock(utc); |
| } |
| } |