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	niro	532	/* 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	niro	816	#include "libbb.h"
12			#include "rtc_.h"
13	niro	532
14			#if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
15			# ifndef _GNU_SOURCE
16			# define _GNU_SOURCE
17			# endif
18			#endif
19
20	niro	816	static const char *rtcname;
21	niro	532
22			static time_t read_rtc(int utc)
23			{
24	niro	816	time_t ret;
25			int fd;
26	niro	532
27	niro	816	fd = rtc_xopen(&rtcname, O_RDONLY);
28			ret = rtc_read_time(fd, utc);
29			close(fd);
30	niro	532
31	niro	816	return ret;
32	niro	532	}
33
34			static void write_rtc(time_t t, int utc)
35			{
36			struct tm tm;
37	niro	816	int rtc = rtc_xopen(&rtcname, O_WRONLY);
38	niro	532
39			tm = *(utc ? gmtime(&t) : localtime(&t));
40			tm.tm_isdst = 0;
41
42	niro	816	xioctl(rtc, RTC_SET_TIME, &tm);
43	niro	532
44			close(rtc);
45			}
46
47	niro	816	static void show_clock(int utc)
48	niro	532	{
49	niro	816	//struct tm *ptm;
50	niro	532	time_t t;
51	niro	816	char *cp;
52	niro	532
53			t = read_rtc(utc);
54	niro	816	//ptm = localtime(&t); /* Sets 'tzname[]' */
55	niro	532
56	niro	816	cp = ctime(&t);
57			if (cp[0])
58			cp[strlen(cp) - 1] = '\0';
59	niro	532
60	niro	816	//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	niro	532	}
63
64	niro	816	static void to_sys_clock(int utc)
65	niro	532	{
66	niro	816	struct timeval tv;
67	niro	532	const struct timezone tz = { timezone/60 - 60*daylight, 0 };
68
69			tv.tv_sec = read_rtc(utc);
70	niro	816	tv.tv_usec = 0;
71	niro	532	if (settimeofday(&tv, &tz))
72			bb_perror_msg_and_die("settimeofday() failed");
73			}
74
75	niro	816	static void from_sys_clock(int utc)
76	niro	532	{
77	niro	816	struct timeval tv;
78	niro	532
79	niro	816	gettimeofday(&tv, NULL);
80			//if (gettimeofday(&tv, NULL))
81			// bb_perror_msg_and_die("gettimeofday() failed");
82	niro	532	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	niro	816	#define HWCLOCK_OPT_RTCFILE 0x20
91	niro	532
92	niro	816	int hwclock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
93			int hwclock_main(int argc UNUSED_PARAM, char **argv)
94	niro	532	{
95			unsigned opt;
96			int utc;
97
98			#if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
99	niro	816	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	niro	532	#endif
109	niro	816	opt_complementary = "r--ws:w--rs:s--wr:l--u:u--l";
110			opt = getopt32(argv, "lurswf:", &rtcname);
111	niro	532
112			/* If -u or -l wasn't given check if we are using utc */
113			if (opt & (HWCLOCK_OPT_UTC \| HWCLOCK_OPT_LOCALTIME))
114	niro	816	utc = (opt & HWCLOCK_OPT_UTC);
115	niro	532	else
116	niro	816	utc = rtc_adjtime_is_utc();
117	niro	532
118	niro	816	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	niro	532	/* default HWCLOCK_OPT_SHOW */
124	niro	816	show_clock(utc);
125
126			return 0;
127	niro	532	}