mirror of
https://github.com/sheumann/hush.git
synced 2024-08-16 09:29:16 +00:00
219 lines
4.5 KiB
C
219 lines
4.5 KiB
C
/* 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 <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 */
|
|
|
|
#if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
|
|
# 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;
|
|
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
|
|
|
|
int hwclock_main ( int argc, char **argv )
|
|
{
|
|
unsigned long 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' },
|
|
{ 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 );
|
|
}
|
|
}
|