?? linuxtime.c
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/* * (C) Finite State Machine Labs Inc. 2000 business@fsmlabs.com * * Released under the terms of GPL 2. * Open RTLinux makes use of a patented process described in * US Patent 5,995,745. Use of this process is governed * by the Open RTLinux Patent License which can be obtained from * www.fsmlabs.com/PATENT or by sending email to * licensequestions@fsmlabs.com */#include <stdio.h>#include <errno.h>#include <sys/time.h>#include <sys/types.h>#include <fcntl.h>#include <unistd.h>#include <sys/ioctl.h>struct timeval torig, t1, t2;int main(void){#define US(x) ( ((unsigned long long)(x).tv_sec*1000000) + (unsigned long long)(x).tv_usec ) gettimeofday(&torig, 0); t1 = torig; do { gettimeofday(&t2, 0); if (US(t2) < US(t1)) { fprintf(stderr, "Linux time went backwards\n"); return -1; } t1 = t2; } while (US(t2) < (US(torig) + (unsigned long long) 10 * 1000000)); return 0;}
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