128 lines
2.7 KiB
C
128 lines
2.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini hwclock implementation for busybox
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*
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* Copyright (C) 2002 Robert Griebl <griebl@gmx.de>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include <sys/utsname.h>
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#include "libbb.h"
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#include "rtc_.h"
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#if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
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# ifndef _GNU_SOURCE
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# define _GNU_SOURCE
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# endif
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#endif
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static const char *rtcname;
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static time_t read_rtc(int utc)
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{
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time_t ret;
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int fd;
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fd = rtc_xopen(&rtcname, O_RDONLY);
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ret = rtc_read_time(fd, utc);
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close(fd);
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return ret;
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}
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static void write_rtc(time_t t, int utc)
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{
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struct tm tm;
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int rtc = rtc_xopen(&rtcname, O_WRONLY);
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tm = *(utc ? gmtime(&t) : localtime(&t));
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tm.tm_isdst = 0;
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xioctl(rtc, RTC_SET_TIME, &tm);
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close(rtc);
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}
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static void show_clock(int utc)
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{
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//struct tm *ptm;
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time_t t;
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char *cp;
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t = read_rtc(utc);
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//ptm = localtime(&t); /* Sets 'tzname[]' */
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cp = ctime(&t);
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if (cp[0])
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cp[strlen(cp) - 1] = '\0';
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//printf("%s %.6f seconds %s\n", cp, 0.0, utc ? "" : (ptm->tm_isdst ? tzname[1] : tzname[0]));
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printf("%s 0.000000 seconds\n", cp);
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}
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static void to_sys_clock(int utc)
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{
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struct timeval tv;
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const struct timezone tz = { timezone/60 - 60*daylight, 0 };
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tv.tv_sec = read_rtc(utc);
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tv.tv_usec = 0;
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if (settimeofday(&tv, &tz))
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bb_perror_msg_and_die("settimeofday() failed");
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}
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static void from_sys_clock(int utc)
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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//if (gettimeofday(&tv, NULL))
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// bb_perror_msg_and_die("gettimeofday() failed");
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write_rtc(tv.tv_sec, utc);
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}
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#define HWCLOCK_OPT_LOCALTIME 0x01
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#define HWCLOCK_OPT_UTC 0x02
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#define HWCLOCK_OPT_SHOW 0x04
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#define HWCLOCK_OPT_HCTOSYS 0x08
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#define HWCLOCK_OPT_SYSTOHC 0x10
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#define HWCLOCK_OPT_RTCFILE 0x20
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int hwclock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int hwclock_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned opt;
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int utc;
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#if ENABLE_FEATURE_HWCLOCK_LONG_OPTIONS
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static const char hwclock_longopts[] ALIGN1 =
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"localtime\0" No_argument "l"
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"utc\0" No_argument "u"
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"show\0" No_argument "r"
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"hctosys\0" No_argument "s"
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"systohc\0" No_argument "w"
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"file\0" Required_argument "f"
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;
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applet_long_options = hwclock_longopts;
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#endif
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opt_complementary = "r--ws:w--rs:s--wr:l--u:u--l";
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opt = getopt32(argv, "lurswf:", &rtcname);
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/* If -u or -l wasn't given check if we are using utc */
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if (opt & (HWCLOCK_OPT_UTC | HWCLOCK_OPT_LOCALTIME))
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utc = (opt & HWCLOCK_OPT_UTC);
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else
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utc = rtc_adjtime_is_utc();
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if (opt & HWCLOCK_OPT_HCTOSYS)
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to_sys_clock(utc);
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else if (opt & HWCLOCK_OPT_SYSTOHC)
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from_sys_clock(utc);
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else
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/* default HWCLOCK_OPT_SHOW */
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show_clock(utc);
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return 0;
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}
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