diff options
Diffstat (limited to 'util-linux')
| -rw-r--r-- | util-linux/hwclock.c | 51 |
1 files changed, 33 insertions, 18 deletions
diff --git a/util-linux/hwclock.c b/util-linux/hwclock.c index 606721e..7f4c563 100644 --- a/util-linux/hwclock.c +++ b/util-linux/hwclock.c @@ -18,17 +18,29 @@ # endif #endif -static const char *rtcname; -static time_t read_rtc(struct timeval *sys_tv, int utc) +/* diff code is disabled: it's not sys/hw clock diff, it's some useless + * "time between hwclock was started and we saw CMOS tick" quantity. + * It's useless since hwclock is started at a random moment, + * thus the quantity is also random, useless. Showing 0.000000 does not + * deprive us from any useful info. */ +#define SHOW_HWCLOCK_DIFF 0 + + +#if !SHOW_HWCLOCK_DIFF +# define read_rtc(pp_rtcname, sys_tv, utc) read_rtc(pp_rtcname, utc) +#endif +static time_t read_rtc(const char **pp_rtcname, struct timeval *sys_tv, int utc) { struct tm tm; int fd; - int before; - fd = rtc_xopen(&rtcname, O_RDONLY); + fd = rtc_xopen(pp_rtcname, O_RDONLY); rtc_read_tm(&tm, fd); + +#if SHOW_HWCLOCK_DIFF + int before; before = tm.tm_sec; while (1) { rtc_read_tm(&tm, fd); @@ -36,6 +48,7 @@ static time_t read_rtc(struct timeval *sys_tv, int utc) if (before != tm.tm_sec) break; } +#endif if (ENABLE_FEATURE_CLEAN_UP) close(fd); @@ -43,19 +56,19 @@ static time_t read_rtc(struct timeval *sys_tv, int utc) return rtc_tm2time(&tm, utc); } -static void show_clock(int utc) +static void show_clock(const char **pp_rtcname, int utc) { - struct timeval sys_tv; time_t t; - long diff; char *cp; - t = read_rtc(&sys_tv, utc); - + t = read_rtc(pp_rtcname, &sys_tv, utc); cp = ctime(&t); strchrnul(cp, '\n')[0] = '\0'; + printf("%s 0.000000 seconds\n", cp); - //printf("%s 0.000000 seconds %s\n", cp, utc ? "" : (ptm->tm_isdst ? tzname[1] : tzname[0])); +#if SHOW_HWCLOCK_DIFF + struct timeval sys_tv; + long diff; diff = sys_tv.tv_sec - t; if (diff < 0 /*&& tv.tv_usec != 0*/) { /* Why? */ @@ -68,9 +81,10 @@ static void show_clock(int utc) sys_tv.tv_usec = 999999 - sys_tv.tv_usec; } printf("%s %ld.%06lu seconds\n", cp, diff, (unsigned long)sys_tv.tv_usec); +#endif } -static void to_sys_clock(int utc) +static void to_sys_clock(const char **pp_rtcname, int utc) { struct timeval tv; struct timezone tz; @@ -78,19 +92,19 @@ static void to_sys_clock(int utc) tz.tz_minuteswest = timezone/60 - 60*daylight; tz.tz_dsttime = 0; - tv.tv_sec = read_rtc(NULL, utc); + tv.tv_sec = read_rtc(pp_rtcname, NULL, utc); tv.tv_usec = 0; if (settimeofday(&tv, &tz)) - bb_perror_msg_and_die("settimeofday() failed"); + bb_perror_msg_and_die("settimeofday"); } -static void from_sys_clock(int utc) +static void from_sys_clock(const char **pp_rtcname, int utc) { #define TWEAK_USEC 200 struct tm tm; struct timeval tv; unsigned adj = TWEAK_USEC; - int rtc = rtc_xopen(&rtcname, O_WRONLY); + int rtc = rtc_xopen(pp_rtcname, O_WRONLY); /* Try to catch the moment when whole second is close */ while (1) { @@ -165,6 +179,7 @@ static void from_sys_clock(int utc) int hwclock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int hwclock_main(int argc UNUSED_PARAM, char **argv) { + const char *rtcname = NULL; unsigned opt; int utc; @@ -189,12 +204,12 @@ int hwclock_main(int argc UNUSED_PARAM, char **argv) utc = rtc_adjtime_is_utc(); if (opt & HWCLOCK_OPT_HCTOSYS) - to_sys_clock(utc); + to_sys_clock(&rtcname, utc); else if (opt & HWCLOCK_OPT_SYSTOHC) - from_sys_clock(utc); + from_sys_clock(&rtcname, utc); else /* default HWCLOCK_OPT_SHOW */ - show_clock(utc); + show_clock(&rtcname, utc); return 0; } |