1 /* vi: set sw=4 ts=4: */
3 * Mini hwclock implementation for busybox
5 * Copyright (C) 2002 Robert Griebl <griebl@gmx.de>
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10 #include <sys/utsname.h>
15 #if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
21 static const char *rtcname;
23 static time_t read_rtc(int utc)
28 fd = rtc_xopen(&rtcname, O_RDONLY);
29 ret = rtc_read_time(fd, utc);
35 static void write_rtc(time_t t, int utc)
38 int rtc = rtc_xopen(&rtcname, O_WRONLY);
40 tm = *(utc ? gmtime(&t) : localtime(&t));
43 xioctl(rtc, RTC_SET_TIME, &tm);
48 static void show_clock(int utc)
55 //ptm = localtime(&t); /* Sets 'tzname[]' */
59 cp[strlen(cp) - 1] = '\0';
61 //printf("%s %.6f seconds %s\n", cp, 0.0, utc ? "" : (ptm->tm_isdst ? tzname[1] : tzname[0]));
62 printf("%s 0.000000 seconds\n", cp);
65 static void to_sys_clock(int utc)
68 const struct timezone tz = { timezone/60 - 60*daylight, 0 };
70 tv.tv_sec = read_rtc(utc);
72 if (settimeofday(&tv, &tz))
73 bb_perror_msg_and_die("settimeofday() failed");
76 static void from_sys_clock(int utc)
80 gettimeofday(&tv, NULL);
81 //if (gettimeofday(&tv, NULL))
82 // bb_perror_msg_and_die("gettimeofday() failed");
83 write_rtc(tv.tv_sec, utc);
86 #define HWCLOCK_OPT_LOCALTIME 0x01
87 #define HWCLOCK_OPT_UTC 0x02
88 #define HWCLOCK_OPT_SHOW 0x04
89 #define HWCLOCK_OPT_HCTOSYS 0x08
90 #define HWCLOCK_OPT_SYSTOHC 0x10
91 #define HWCLOCK_OPT_RTCFILE 0x20
93 int hwclock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
94 int hwclock_main(int argc ATTRIBUTE_UNUSED, char **argv)
99 #if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
100 static const char hwclock_longopts[] ALIGN1 =
101 "localtime\0" No_argument "l"
102 "utc\0" No_argument "u"
103 "show\0" No_argument "r"
104 "hctosys\0" No_argument "s"
105 "systohc\0" No_argument "w"
106 "file\0" Required_argument "f"
108 applet_long_options = hwclock_longopts;
110 opt_complementary = "r--ws:w--rs:s--wr:l--u:u--l";
111 opt = getopt32(argv, "lurswf:", &rtcname);
113 /* If -u or -l wasn't given check if we are using utc */
114 if (opt & (HWCLOCK_OPT_UTC | HWCLOCK_OPT_LOCALTIME))
115 utc = (opt & HWCLOCK_OPT_UTC);
117 utc = rtc_adjtime_is_utc();
119 if (opt & HWCLOCK_OPT_HCTOSYS)
121 else if (opt & HWCLOCK_OPT_SYSTOHC)
124 /* default HWCLOCK_OPT_SHOW */