| /* 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/utsname.h> |
| #include <getopt.h> |
| #include "libbb.h" |
| #include "rtc_.h" |
| |
| #if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS |
| # ifndef _GNU_SOURCE |
| # define _GNU_SOURCE |
| # endif |
| #endif |
| |
| static const char *rtcname; |
| |
| static time_t read_rtc(int utc) |
| { |
| time_t ret; |
| int fd; |
| |
| fd = rtc_xopen(&rtcname, O_RDONLY); |
| ret = rtc_read_time(fd, utc); |
| close(fd); |
| |
| return ret; |
| } |
| |
| static void write_rtc(time_t t, int utc) |
| { |
| struct tm tm; |
| int rtc = rtc_xopen(&rtcname, O_WRONLY); |
| |
| tm = *(utc ? gmtime(&t) : localtime(&t)); |
| tm.tm_isdst = 0; |
| |
| xioctl(rtc, RTC_SET_TIME, &tm); |
| |
| close(rtc); |
| } |
| |
| static void show_clock(int utc) |
| { |
| //struct tm *ptm; |
| time_t t; |
| char *cp; |
| |
| t = read_rtc(utc); |
| //ptm = localtime(&t); /* Sets 'tzname[]' */ |
| |
| cp = ctime(&t); |
| if (cp[0]) |
| cp[strlen(cp) - 1] = '\0'; |
| |
| //printf("%s %.6f seconds %s\n", cp, 0.0, utc ? "" : (ptm->tm_isdst ? tzname[1] : tzname[0])); |
| printf("%s 0.000000 seconds\n", cp); |
| } |
| |
| static void to_sys_clock(int utc) |
| { |
| struct timeval tv; |
| const struct timezone tz = { timezone/60 - 60*daylight, 0 }; |
| |
| tv.tv_sec = read_rtc(utc); |
| tv.tv_usec = 0; |
| if (settimeofday(&tv, &tz)) |
| bb_perror_msg_and_die("settimeofday() failed"); |
| } |
| |
| static void from_sys_clock(int utc) |
| { |
| struct timeval tv; |
| |
| gettimeofday(&tv, NULL); |
| //if (gettimeofday(&tv, NULL)) |
| // bb_perror_msg_and_die("gettimeofday() failed"); |
| write_rtc(tv.tv_sec, 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) MAIN_EXTERNALLY_VISIBLE; |
| int hwclock_main(int argc ATTRIBUTE_UNUSED, char **argv) |
| { |
| unsigned opt; |
| int utc; |
| |
| #if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS |
| static const char hwclock_longopts[] ALIGN1 = |
| "localtime\0" No_argument "l" |
| "utc\0" No_argument "u" |
| "show\0" No_argument "r" |
| "hctosys\0" No_argument "s" |
| "systohc\0" No_argument "w" |
| "file\0" Required_argument "f" |
| ; |
| applet_long_options = hwclock_longopts; |
| #endif |
| opt_complementary = "r--ws:w--rs:s--wr:l--u:u--l"; |
| opt = getopt32(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 = rtc_adjtime_is_utc(); |
| |
| if (opt & HWCLOCK_OPT_HCTOSYS) |
| to_sys_clock(utc); |
| else if (opt & HWCLOCK_OPT_SYSTOHC) |
| from_sys_clock(utc); |
| else |
| /* default HWCLOCK_OPT_SHOW */ |
| show_clock(utc); |
| |
| return 0; |
| } |