1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
4  * Copyright (C) 1993-1998 by Andrey A. Chernov, Moscow, Russia.
34  * using zoneinfo rules or direct TZ environment variable set.
55 #define Unknown (-1)
73 	struct timeval tv, *stv;  in main()  local
81 	int initial_isdst = -1, final_isdst;  in main()
86 	while ((ch = getopt(argc, argv, "ais")) != -1)  in main()
151 	if (sysctlbyname("machdep.adjkerntz", &kern_offset, &len, NULL, 0) == -1) {  in main()
159 	if (gettimeofday(&tv, &tz)) {  in main()
165 	initial_sec = tv.tv_sec;  in main()
176 	if (localsec == -1) {  in main()
197 	offset = -local.tm_gmtoff;  in main()
205 	diff = offset - tz.tz_minuteswest * 60 - kern_offset;  in main()
228 		if (localsec == -1) {  in main()
249 		offset = -local.tm_gmtoff;  in main()
257 		diff = offset - tz.tz_minuteswest * 60 - kern_offset;  in main()
267 			stv = &tv;  in main()
285 		if (sysctlbyname("machdep.disable_rtc_set", &disrtcset, &len, NULL, 0) == -1) {  in main()
292 			if (sysctlbyname("machdep.disable_rtc_set", NULL, NULL, &disrtcset, len) == -1) {  in main()
293 				syslog(LOG_ERR, "sysctl(set: \"machdep.disable_rtc_set\"): %m");  in main()
310 			(void)gettimeofday(&tv, NULL);  in main()
311 			tv.tv_sec += diff;  in main()
312 			stv = &tv;  in main()
322 	/* -- don't write RTC, else write RTC.                          */  in main()
327 		if (sysctlbyname("machdep.adjkerntz", NULL, NULL, &kern_offset, len) == -1) {  in main()
328 			syslog(LOG_ERR, "sysctl(set: \"machdep.adjkerntz\"): %m");  in main()
334 	if (sysctlbyname("machdep.wall_cmos_clock",  NULL, NULL, &wall_clock, len) == -1) {  in main()
335 		syslog(LOG_ERR, "sysctl(set: \"machdep.wall_cmos_clock\"): %m");  in main()
343 		if (sysctlbyname("machdep.disable_rtc_set", NULL, NULL, &disrtcset, len) == -1) {  in main()
344 			syslog(LOG_ERR, "sysctl(set: \"machdep.disable_rtc_set\"): %m");  in main()
353 		/* wait for signals and acts like -a */  in main()
365 		"usage: adjkerntz -i",  in usage()
367 		"       adjkerntz -a [-s]",  in usage()
368 		"\t\t(adjustment call, -s for sleep/retry mode)");  in usage()