7  *	$ gcc adjtick.c -o adjtick -lrt
11  *   the Free Software Foundation, either version 2 of the License, or
40 		val = -val;  in llabs()
66 	return end_ns - start_ns;  in diff_timespec()
90 			tmp = (ts_to_nsec(start) + ts_to_nsec(end))/2;  in get_monotonic_and_raw()
110 	eppm = (delta1*MILLION)/delta2 - MILLION;  in get_ppm_drift()
118 	struct timex tx1;  in check_tick_adj()  local
120 	tx1.modes	 = ADJ_TICK;  in check_tick_adj()
121 	tx1.modes	|= ADJ_OFFSET;  in check_tick_adj()
122 	tx1.modes	|= ADJ_FREQUENCY;  in check_tick_adj()
123 	tx1.modes	|= ADJ_STATUS;  in check_tick_adj()
125 	tx1.status	= STA_PLL;  in check_tick_adj()
126 	tx1.offset	= 0;  in check_tick_adj()
127 	tx1.freq	= 0;  in check_tick_adj()
128 	tx1.tick	= tickval;  in check_tick_adj()
130 	adjtimex(&tx1);  in check_tick_adj()
134 	ppm = ((long long)tickval * MILLION)/systick - MILLION;  in check_tick_adj()
141 	tx1.modes = 0;  in check_tick_adj()
142 	adjtimex(&tx1);  in check_tick_adj()
144 	if (tx1.offset || tx1.freq || tx1.tick != tickval) {  in check_tick_adj()
147 		return -1;  in check_tick_adj()
159 	if (llabs(eppm - ppm) > 100) {  in check_tick_adj()
161 		return -1;  in check_tick_adj()
172 	struct timex tx1;  in main()  local
179 		return -1;  in main()
186 	max = systick/10; /* +/- 10% */  in main()
189 	for (tick = (systick - max); tick < (systick + max); tick += interval) {  in main()
197 	tx1.modes	 = ADJ_TICK;  in main()
198 	tx1.modes	|= ADJ_OFFSET;  in main()
199 	tx1.modes	|= ADJ_FREQUENCY;  in main()
201 	tx1.offset	 = 0;  in main()
202 	tx1.freq	 = 0;  in main()
203 	tx1.tick	 = systick;  in main()
205 	adjtimex(&tx1);  in main()