homeworkb.c

用系统调用signal()让父进程捕捉键盘上来的中断信号（按Ctrl-C键）；当捕捉到中断信号后

#include<stdio.h>
void pro1()
{
 int i;
 sleep(2);
 for(i=1;i<=10;i++)
 {
         printf("b ");
 }
         printf("\n");
}
void pro2()
{
 int i;
 sleep(2);
 for(i=1;i<=10;i++)
 {
         printf("c ");
 }
         printf("\n");
}
int main(void)
{
      int pid1,pid2;
        int i;
        for(i=1;i<=5;i++)
        {
                printf("a ");
        }
        printf("\n");
        pid1=fork();
        if(pid1==0)
        {
                pro1();
                printf("child 1 is alive!\n");
     //         execl("/bin/ls","ls","-al",0);
                exit(1);
        }
        else
        {
                pid2=fork();
                if(pid2==0)
                {
                        pro2();
                        printf("child 2 is alive!\n");
         //             execl("/bin/ls","ls","-a",0);
						exit(1);
                }
                else
                {
                        wait();
                        wait();                      
                        for(i=1;i<=5;i++)
                        printf("a ");
                        printf("\n");
                }
        }
        printf("over\n");
        return 1;
}