1 /* 2 * Copyright (c) 2011 Cyril Hrubis <chrubis (at) suse.cz> 3 * 4 * This file is licensed under the GPL license. For the full content 5 * of this license, see the COPYING file at the top level of this 6 * source tree. 7 */ 8 9 /* 10 * Here comes common funcions to correctly compute difference between two 11 * struct timespec values. 12 */ 13 14 #define NSEC_IN_SEC 1000000000 15 16 /* 17 * Returns difference between two struct timespec values. If difference is 18 * greater that 1 sec, 1 sec is returned. 19 */ 20 static long timespec_nsec_diff(struct timespec *t1, struct timespec *t2) 21 { 22 time_t sec_diff; 23 long nsec_diff; 24 25 if (t2->tv_sec > t1->tv_sec) { 26 struct timespec *tmp; 27 tmp = t1; 28 t1 = t2; 29 t2 = tmp; 30 } 31 32 sec_diff = t1->tv_sec - t2->tv_sec; 33 nsec_diff = t1->tv_nsec - t2->tv_nsec; 34 35 if (sec_diff > 1 || (sec_diff == 1 && nsec_diff >= 0)) 36 return NSEC_IN_SEC; 37 38 return abs(nsec_diff + NSEC_IN_SEC * sec_diff); 39 } 40
