diff options
Diffstat (limited to 'busybox/util-linux/hwclock.c')
| -rw-r--r-- | busybox/util-linux/hwclock.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/busybox/util-linux/hwclock.c b/busybox/util-linux/hwclock.c new file mode 100644 index 0000000..a260d74 --- /dev/null +++ b/busybox/util-linux/hwclock.c @@ -0,0 +1,230 @@ +/* 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; +} + + +static int check_utc(void) +{ + int utc = 0; + FILE *f = fopen ( "/var/lib/hwclock/adjtime", "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 1 +#define HWCLOCK_OPT_UTC 2 +#define HWCLOCK_OPT_SHOW 4 +#define HWCLOCK_OPT_HCTOSYS 8 +#define HWCLOCK_OPT_SYSTOHC 16 + +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_complementaly = "r~ws:w~rs:s~wr:l~u:u~l"; + opt = bb_getopt_ulflags(argc, argv, "lursw"); + /* Check only one mode was given */ + if(opt & 0x80000000UL) { + bb_show_usage(); + } + + /* 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 ); + } +} |