signal.cpp

C语言编程实现了linux的shell功能

/*****************************************************************************/
/*作者:王伟*/
/*班级:自42*/
/*学号：2004011443*/
/*程序功能:软中断信号联系*/
/*日期：2007.6.1*/
/*****************************************************************************/

#include <signal.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#include <time.h>
void handler(int signo) 
{
	signal(SIGINT,SIG_IGN);
	//char * argv[]={"date\0",(char *)0 };
	//execl("/bin/ls","ls",(char * )0);
	//execl("/bin/ls","ls","-al","/etc/passwd",(char * )0);
	time_t timep;
	time (&timep);
	printf("now the time is=%s\n",asctime(gmtime(&timep)));
	signal(SIGINT,handler);
}
int main()
{
	int i;
	signal(SIGINT,handler);
	for(i=1;i<=100;i++)
	{
		printf("i=%d\n",i);
		sleep(1);
	}
	printf("the program ends!\n");
	return 1;
}