/* vi: set sw=4 ts=4: */ /* * Mini hwclock implementation for busybox * * Copyright (C) 2002 Robert Griebl <griebl@gmx.de> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include <sys/ioctl.h> #include <sys/time.h> #include <sys/utsname.h> #include <ctype.h> #include <fcntl.h> #include <getopt.h> #include <stdlib.h> #include <string.h> #include <syslog.h> #include <time.h> #include <unistd.h> #include "busybox.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 */ #ifdef CONFIG_FEATURE_HWCLOCK_LONGOPTIONS # ifndef _GNU_SOURCE # define _GNU_SOURCE # endif #endif static time_t read_rtc(int utc) { int rtc; struct tm tm; char *oldtz = 0; time_t t = 0; if (( rtc = open ( "/dev/rtc", O_RDONLY )) < 0 ) { if (( rtc = open ( "/dev/misc/rtc", O_RDONLY )) < 0 ) bb_perror_msg_and_die ( "Could not access RTC" ); } memset ( &tm, 0, sizeof( struct tm )); if ( ioctl ( rtc, RTC_RD_TIME, &tm ) < 0 ) bb_perror_msg_and_die ( "Could not 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) { int rtc; struct tm tm; if (( rtc = open ( "/dev/rtc", O_WRONLY )) < 0 ) { if (( rtc = open ( "/dev/misc/rtc", O_WRONLY )) < 0 ) bb_perror_msg_and_die ( "Could not access RTC" ); } tm = *( utc ? gmtime ( &t ) : localtime ( &t )); tm. tm_isdst = 0; if ( ioctl ( rtc, RTC_SET_TIME, &tm ) < 0 ) bb_perror_msg_and_die ( "Could not set the RTC time" ); close ( rtc ); } static int show_clock(int utc) { struct tm *ptm; time_t t; char buffer [64]; t = read_rtc ( utc ); ptm = localtime ( &t ); /* Sets 'tzname[]' */ safe_strncpy ( buffer, ctime ( &t ), sizeof( buffer )); if ( buffer [0] ) buffer [bb_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 ); 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 ) { char buffer [128]; while ( fgets ( buffer, sizeof( buffer ), f )) { int len = bb_strlen ( buffer ); while ( len && isspace ( buffer [len - 1] )) len--; buffer [len] = 0; if ( strncmp ( buffer, "UTC", 3 ) == 0 ) { utc = 1; break; } } fclose ( f ); } 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 extern int hwclock_main ( int argc, char **argv ) { unsigned long opt; int utc; #ifdef CONFIG_FEATURE_HWCLOCK_LONGOPTIONS 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' }, { 0, 0, 0, 0 } }; bb_applet_long_options = hwclock_long_options; #endif bb_opt_complementally = "!r~ws:w~rs:s~wr:l~u:u~l"; opt = bb_getopt_ulflags(argc, argv, "lursw"); /* 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 ); } }