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>
14 /* Copied from linux/rtc.h to eliminate the kernel dependency */
15 struct linux_rtc_time {
27 #define RTC_SET_TIME _IOW('p', 0x0a, struct linux_rtc_time) /* Set RTC time */
28 #define RTC_RD_TIME _IOR('p', 0x09, struct linux_rtc_time) /* Read RTC time */
30 #if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
36 static const char *rtcname;
38 static int xopen_rtc(int flags)
43 rtc = open("/dev/rtc", flags);
46 rtc = open("/dev/rtc0", flags);
49 rtcname = "/dev/misc/rtc";
51 return xopen(rtcname, flags);
54 static time_t read_rtc(int utc)
59 int rtc = xopen_rtc(O_RDONLY);
61 memset(&tm, 0, sizeof(struct tm));
62 xioctl(rtc, RTC_RD_TIME, &tm);
63 tm.tm_isdst = -1; /* not known */
69 putenv((char*)"TZ=UTC0");
84 static void write_rtc(time_t t, int utc)
87 int rtc = xopen_rtc(O_WRONLY);
89 tm = *(utc ? gmtime(&t) : localtime(&t));
92 xioctl(rtc, RTC_SET_TIME, &tm);
97 static void show_clock(int utc)
104 //ptm = localtime(&t); /* Sets 'tzname[]' */
108 cp[strlen(cp) - 1] = '\0';
110 //printf("%s %.6f seconds %s\n", cp, 0.0, utc ? "" : (ptm->tm_isdst ? tzname[1] : tzname[0]));
111 printf("%s 0.000000 seconds\n", cp);
114 static void to_sys_clock(int utc)
117 const struct timezone tz = { timezone/60 - 60*daylight, 0 };
119 tv.tv_sec = read_rtc(utc);
121 if (settimeofday(&tv, &tz))
122 bb_perror_msg_and_die("settimeofday() failed");
125 static void from_sys_clock(int utc)
129 gettimeofday(&tv, NULL);
130 //if (gettimeofday(&tv, NULL))
131 // bb_perror_msg_and_die("gettimeofday() failed");
132 write_rtc(tv.tv_sec, utc);
135 #if ENABLE_FEATURE_HWCLOCK_ADJTIME_FHS
136 # define ADJTIME_PATH "/var/lib/hwclock/adjtime"
138 # define ADJTIME_PATH "/etc/adjtime"
140 static int check_utc(void)
143 FILE *f = fopen(ADJTIME_PATH, "r");
146 RESERVE_CONFIG_BUFFER(buffer, 128);
148 while (fgets(buffer, sizeof(buffer), f)) {
149 int len = strlen(buffer);
151 while (len && isspace(buffer[len - 1]))
156 if (strncmp(buffer, "UTC", 3) == 0) {
162 RELEASE_CONFIG_BUFFER(buffer);
167 #define HWCLOCK_OPT_LOCALTIME 0x01
168 #define HWCLOCK_OPT_UTC 0x02
169 #define HWCLOCK_OPT_SHOW 0x04
170 #define HWCLOCK_OPT_HCTOSYS 0x08
171 #define HWCLOCK_OPT_SYSTOHC 0x10
172 #define HWCLOCK_OPT_RTCFILE 0x20
174 int hwclock_main(int argc, char **argv);
175 int hwclock_main(int argc, char **argv)
180 #if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
181 static const char hwclock_longopts[] ALIGN1 =
182 "localtime\0" No_argument "l"
183 "utc\0" No_argument "u"
184 "show\0" No_argument "r"
185 "hctosys\0" No_argument "s"
186 "systohc\0" No_argument "w"
187 "file\0" Required_argument "f"
189 applet_long_options = hwclock_longopts;
191 opt_complementary = "r--ws:w--rs:s--wr:l--u:u--l";
192 opt = getopt32(argv, "lurswf:", &rtcname);
194 /* If -u or -l wasn't given check if we are using utc */
195 if (opt & (HWCLOCK_OPT_UTC | HWCLOCK_OPT_LOCALTIME))
196 utc = opt & HWCLOCK_OPT_UTC;
200 if (opt & HWCLOCK_OPT_HCTOSYS) {
204 if (opt & HWCLOCK_OPT_SYSTOHC) {
208 /* default HWCLOCK_OPT_SHOW */