busybox/util-linux/hwclock.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/utsname.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 UNUSED_PARAM, 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;
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* Mini hwclock implementation for busybox
4	*
5	* Copyright (C) 2002 Robert Griebl <griebl@gmx.de>
6	*
7	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8	*/
9
10	#include <sys/utsname.h>
11	#include "libbb.h"
12	#include "rtc_.h"
13
14	#if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
15	# ifndef _GNU_SOURCE
16	# define _GNU_SOURCE
17	# endif
18	#endif
19
20	static const char *rtcname;
21
22	static time_t read_rtc(int utc)
23	{
24	time_t ret;
25	int fd;
26
27	fd = rtc_xopen(&rtcname, O_RDONLY);
28	ret = rtc_read_time(fd, utc);
29	close(fd);
30
31	return ret;
32	}
33
34	static void write_rtc(time_t t, int utc)
35	{
36	struct tm tm;
37	int rtc = rtc_xopen(&rtcname, O_WRONLY);
38
39	tm = *(utc ? gmtime(&t) : localtime(&t));
40	tm.tm_isdst = 0;
41
42	xioctl(rtc, RTC_SET_TIME, &tm);
43
44	close(rtc);
45	}
46
47	static void show_clock(int utc)
48	{
49	//struct tm *ptm;
50	time_t t;
51	char *cp;
52
53	t = read_rtc(utc);
54	//ptm = localtime(&t); /* Sets 'tzname[]' */
55
56	cp = ctime(&t);
57	if (cp[0])
58	cp[strlen(cp) - 1] = '\0';
59
60	//printf("%s %.6f seconds %s\n", cp, 0.0, utc ? "" : (ptm->tm_isdst ? tzname[1] : tzname[0]));
61	printf("%s 0.000000 seconds\n", cp);
62	}
63
64	static void to_sys_clock(int utc)
65	{
66	struct timeval tv;
67	const struct timezone tz = { timezone/60 - 60*daylight, 0 };
68
69	tv.tv_sec = read_rtc(utc);
70	tv.tv_usec = 0;
71	if (settimeofday(&tv, &tz))
72	bb_perror_msg_and_die("settimeofday() failed");
73	}
74
75	static void from_sys_clock(int utc)
76	{
77	struct timeval tv;
78
79	gettimeofday(&tv, NULL);
80	//if (gettimeofday(&tv, NULL))
81	// bb_perror_msg_and_die("gettimeofday() failed");
82	write_rtc(tv.tv_sec, utc);
83	}
84
85	#define HWCLOCK_OPT_LOCALTIME 0x01
86	#define HWCLOCK_OPT_UTC 0x02
87	#define HWCLOCK_OPT_SHOW 0x04
88	#define HWCLOCK_OPT_HCTOSYS 0x08
89	#define HWCLOCK_OPT_SYSTOHC 0x10
90	#define HWCLOCK_OPT_RTCFILE 0x20
91
92	int hwclock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
93	int hwclock_main(int argc UNUSED_PARAM, char **argv)
94	{
95	unsigned opt;
96	int utc;
97
98	#if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
99	static const char hwclock_longopts[] ALIGN1 =
100	"localtime\0" No_argument "l"
101	"utc\0" No_argument "u"
102	"show\0" No_argument "r"
103	"hctosys\0" No_argument "s"
104	"systohc\0" No_argument "w"
105	"file\0" Required_argument "f"
106	;
107	applet_long_options = hwclock_longopts;
108	#endif
109	opt_complementary = "r--ws:w--rs:s--wr:l--u:u--l";
110	opt = getopt32(argv, "lurswf:", &rtcname);
111
112	/* If -u or -l wasn't given check if we are using utc */
113	if (opt & (HWCLOCK_OPT_UTC \| HWCLOCK_OPT_LOCALTIME))
114	utc = (opt & HWCLOCK_OPT_UTC);
115	else
116	utc = rtc_adjtime_is_utc();
117
118	if (opt & HWCLOCK_OPT_HCTOSYS)
119	to_sys_clock(utc);
120	else if (opt & HWCLOCK_OPT_SYSTOHC)
121	from_sys_clock(utc);
122	else
123	/* default HWCLOCK_OPT_SHOW */
124	show_clock(utc);
125
126	return 0;
127	}