9  *  kernel's leap-second behavior, as well as how well applications
10  *  handle the leap-second discontinuity.
12  *  Usage: leap-a-day [-s] [-i <num>]
15  *	-s:	Each iteration, set the date to 10 seconds before midnight GMT.
21  *	-i:	Number of iterations to run (default: infinite)
27  *	$ gcc leap-a-day.c -o leap-a-day -lrt
75 		ts.tv_nsec -= NSEC_PER_SEC;  in timespec_add()
97 	struct timex tx;  in clear_time_state()  local
103 	 * -stable), had an issue with the state machine  in clear_time_state()
106 	tx.modes = ADJ_STATUS;  in clear_time_state()
107 	tx.status = STA_PLL;  in clear_time_state()
108 	ret = adjtimex(&tx);  in clear_time_state()
111 	tx.modes = ADJ_MAXERROR;  in clear_time_state()
112 	tx.maxerror = 0;  in clear_time_state()
113 	ret = adjtimex(&tx);  in clear_time_state()
116 	tx.modes = ADJ_STATUS;  in clear_time_state()
117 	tx.status = 0;  in clear_time_state()
118 	ret = adjtimex(&tx);  in clear_time_state()
123 /* Make sure we cleanup on ctrl-c */
132 	struct timex tx;  in sigalarm()  local
135 	tx.modes = 0;  in sigalarm()
136 	ret = adjtimex(&tx);  in sigalarm()
138 	if (tx.time.tv_sec < next_leap) {  in sigalarm()
141 		printf("adjtimex: %10ld sec + %6ld us (%i)\t%s\n",  in sigalarm()
142 					tx.time.tv_sec,  in sigalarm()
143 					tx.time.tv_usec,  in sigalarm()
144 					tx.tai,  in sigalarm()
150 		printf("adjtimex: %10ld sec + %6ld us (%i)\t%s\n",  in sigalarm()
151 					tx.time.tv_sec,  in sigalarm()
152 					tx.time.tv_usec,  in sigalarm()
153 					tx.tai,  in sigalarm()
189 	while ((opt = getopt(argc, argv, "sti:")) != -1) {  in main()
192 …printf("Only setting leap-flag, not changing time. It could take up to a day for leap to trigger.\…  in main()
202 			printf("Usage: %s [-w] [-i <iterations>]\n", argv[0]);  in main()
203 			printf("	-w: Set flag and wait for leap second each iteration");  in main()
205 			printf("	-i: Number of iterations (-1 = infinite, default is 10)\n");  in main()
206 			printf("	-t: Print TAI time\n");  in main()
207 			exit(-1);  in main()
211 	/* Make sure TAI support is present if -t was used */  in main()
231 		printf("This runs continuously. Press ctrl-c to stop\n");  in main()
233 		printf("Running for %i iterations. Press ctrl-c to stop\n", iterations);  in main()
239 		struct timex tx;  in main()  local
247 		next_leap += 86400 - (next_leap % 86400);  in main()
252 			tv.tv_sec = next_leap - 10;  in main()
262 		tx.modes = ADJ_STATUS;  in main()
264 			tx.status = STA_INS;  in main()
266 			tx.status = STA_DEL;  in main()
267 		ret = adjtimex(&tx);  in main()
275 		tx.modes = 0;  in main()
276 		ret = adjtimex(&tx);  in main()
277 		if (tx.status != STA_INS && tx.status != STA_DEL) {  in main()
291 		printf("Setting timer for %ld -  %s", next_leap, ctime(&next_leap));  in main()
296 		if (timer_create(CLOCK_REALTIME, &se, &tm1) == -1) {  in main()
307 		ts.tv_sec = next_leap - 3;  in main()
315 		tx.modes = 0;  in main()
316 		ret = adjtimex(&tx);  in main()
317 		if (tx.status != STA_INS && tx.status != STA_DEL) {  in main()
319 			tx.modes = ADJ_STATUS;  in main()
321 				tx.status = STA_INS;  in main()
323 				tx.status = STA_DEL;  in main()
324 			ret = adjtimex(&tx);  in main()
328 		now = tx.time.tv_sec;  in main()
334 			tx.modes = 0;  in main()
335 			ret = adjtimex(&tx);  in main()
339 				printf("%ld sec, %9ld ns\t%s\n",  in main()
344 				ctime_r(&tx.time.tv_sec, buf);  in main()
345 				buf[strlen(buf)-1] = 0; /*remove trailing\n */  in main()
349 						tx.time.tv_usec,  in main()
350 						tx.tai,  in main()
353 			now = tx.time.tv_sec;  in main()
372 		if ((iterations != -1) && !(--iterations))  in main()