clock_gettime 用法

#include <stdio.h>

#include <stdlib.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <unistd.h>

#include <string.h>

#include <time.h>

#define TARGET_FILE_NAME    "/tmp/test"

int main(void)

{

    struct stat st;

    struct timespec start, end;

    unsigned long long elapse;

    int ret;

    ret = clock_gettime(CLOCK_REALTIME, &start);

    if (ret < 0) {

        fprintf(stderr, "Unable to get start timestamp\n");

        return ret;

    }

    ret = lstat(TARGET_FILE_NAME, &st);

    if (ret < 0) {

        fprintf(stderr, "Error on lstat()\n");

        return ret;

    }

    ret = clock_gettime(CLOCK_REALTIME, &end);

    if (ret < 0) {

        fprintf(stderr, "Unable to get end timestamp\n");

        return ret;

    }

    elapse = (end.tv_sec - start.tv_sec) * 1000000000 +

             (end.tv_nsec - start.tv_nsec);

    fprintf(stdout, "elapse: %lld ns\n", elapse);

    return 0;

}
巴特西

clock_gettime 用法

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