signal（7）---一个普通的函数

发送SIGUSR1信号，接收到处理完信号之后程序继续运行

#include <unistd.h>
#include <sys/types.h>
#include <signal.h>
#include <stdio.h>

void sig_usr(int signo){
    printf("get signo SIGUSR1\n");
}

int main(){

    int i;
    int j;

    signal(SIGUSR1, sig_usr);
    for(i = 1; i < 10; i++){
        if(i%3 == 0){
            printf("send sig SIGUSR1\n");
            kill(getpid(), SIGUSR1);
        }
        else{
            printf("the normal num is %d\n",i);
        }
    }

    printf("\nthe final i is %d\n", i);

    return 0;
}

结果如下：

the normal num is 1

the normal num is 2

send sig SIGUSR1

get signo SIGUSR1

the normal num is 4

the normal num is 5

send sig SIGUSR1

get signo SIGUSR1

the normal num is 7

the normal num is 8

send sig SIGUSR1

get signo SIGUSR1

the final i is 10