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【Linux学习】倒计时退出,当进程收到SIGUSR1信号时开始倒计时,3秒钟后退出程序。

题目3:

编写一个程序实现倒计时退出功能,当进程收到SIGUSR1信号时开始倒计时,3秒钟后退出程序。
要求在终端上输出收到信号并开始倒计时的过程
如:
The process is terminating in 3 sec...
The process is terminating in 2 sec...
The process is terminating in 1 sec...

 

 1 #include <sys/types.h> 2 #include <unistd.h> 3 #include <signal.h> 4 #include <stdlib.h> 5 #include <string.h> 6 #include <stdio.h> 7 #include <errno.h> 8 #include <signal.h> 9 10 int g_tag;11 12 void  myhandle(int num)13 {14     printf("recv signal id num : %d \n", num);15     if (num == 10)16     {17         g_tag = 0;18     }19 }20 21 int main(void)22 {23 24     g_tag = 1;25 26     27     if ( signal(SIGUSR1, myhandle) == SIG_ERR )28     {29         perror("signal err");30         return 0;31     }32     33     while(1)34     {35         if(g_tag == 0)36         {37             printf("The process is terminating in 3 sec...\n");38             sleep(1);39             printf("The process is terminating in 2 sec...\n");40             sleep(1);41             printf("The process is terminating in 1 sec...\n");42             sleep(1);43             break;44         }45     }46 47     48     return 0;49 }

 

【Linux学习】倒计时退出,当进程收到SIGUSR1信号时开始倒计时,3秒钟后退出程序。