在ubuntu中取得時間

Question

#include <sys/time.h>
#include <stdio.h>


int GetTime()
{

   struct timespec tsp;

   clock_gettime(CLOCK_REALTIME, &tsp);   //Call clock_gettime to fill tsp

   fprintf(stdout, "time=%d.%d\n", tsp.tv_sec, tsp.tv_nsec);

   fflush(stdout);

}

我試著編譯上面的程式碼，但它不斷拋出錯誤：

time.c: In function ‘GetTime’:
time.c:12:4: warning: implicit declaration of function ‘clock_gettime’ [-Wimplicit-function-declaration]
time.c:12:18: error: ‘CLOCK_REALTIME’ undeclared (first use in this function)
time.c:12:18: note: each undeclared identifier is reported only once for each function it appears in
time.c:14:4: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘__time_t’ [-Wformat]
time.c:14:4: warning: format ‘%d’ expects argument of type ‘int’, but argument 4 has type ‘long int’ [-Wformat]

我嘗試使用 -lrt 標誌和 -std=gnu99 進行編譯。什麼都不起作用。

Answer 1

用#include <sys/time.h>。#include <time.h>

fprintf(stdout, "time=%d.%d\n", tsp.tv_sec, tsp.tv_nsec);與

fprintf(stdout, "time=%d.%d\n", (int) tsp.tv_sec, (int) ttsp.tv_nsec);

另一個很好的例子：http://ubuntuforums.org/showthread.php?t=1244004&p=7812845#post7812845