justtest.c

这是linux下的基础C编程代码。都是已经调试成功的

#include <stdio.h>
#include <stdlib.h>


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


void print_time() 
{
	struct timeval tp; 
	struct tm t_m;
	gettimeofday (&tp, NULL);
	t_m = *localtime( &tp );
	printf("TIME -- %d:%d:%d:%f:%f  [1 ms:0 us]\n",
		t_m.tm_hour,t_m.tm_min, t_m.tm_sec, tp.tv_usec/1000,tp.tv_usec); 
}

int main(void)
{
	int i=10;
	struct timeval timeout;
	printf("----------- test sleep -----------\n");
	while (i>0) {
		sleep(1);
		print_time();
		i--;
	}

	printf("----------- test select -------------- \n");
	i=100;
	while (i>0) {
		i--;
		timeout.tv_sec = 0;
		timeout.tv_usec = 2000;
		select(FD_SETSIZE,NULL,NULL,NULL,&timeout);
		print_time();
	}
}