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#include <assert.h> #include <stdlib.h> #include <sys/time.h> int main() { struct timeval tv1; struct timeval tv2; long long s1; long long us1; long long s2; long long us2; int r; int success = 0; r = gettimeofday(&tv1, NULL); assert(r == 0); s1 = tv1.tv_sec; us1 = tv1.tv_usec; for (int i = 0; i < 10000; i++) { r = gettimeofday(&tv2, NULL); assert(r == 0); s2 = tv2.tv_sec; us2 = tv2.tv_usec; assert(s1 <= s2); // Verify that some time has passed. if (s2 > s1 || (s2 == s1 && us2 > us1)) { success = 1; break; } } assert(success == 1); }