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Aug 18th, 2017
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  1. void timespec_minus(struct timespec * tv_a, const struct timespec * tv_b) {
  2.     tv_a->tv_sec -= tv_b->tv_sec;
  3.     tv_a->tv_nsec -= tv_b->tv_nsec;
  4.    
  5.     if (tv_a->tv_nsec < 0) {
  6.         tv_a->tv_sec -= 1;
  7.         tv_a->tv_nsec += 1000 * 1000 * 1000;
  8.     }
  9. }
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