test

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

pid_t pid1, pid2;
int fd[2];

void handler1(int sg)
{
    if (sg == SIGINT)
    {
        kill(pid1, SIGUSR1);
        kill(pid2, SIGUSR1);
    }
}

void handler2(int sg)
{
    close(fd[0]);
    close(fd[1]);

    if (pid1 == 0 && sg == SIGUSR1)
    {
        printf("Child Process 1 is killed by Parent!\n");
        exit(0);
    }
    if (pid2 == 0 && sg == SIGUSR1)
    {
        printf("Child Process 2 is killed by Parent!\n");
        exit(0);
    }
}

int main()
{
    int myclock = 1;
    char buf[64];
    char msg[64];
    memset(buf, 0, 64);
    memset(msg, 0, 64);

    if (pipe(fd) < 0)
    {
        perror("pipe");
        exit(1);
    }

    signal(SIGINT, handler1);

    pid1 = fork();

    if (pid1 == 0)
    {
        signal(SIGINT, SIG_IGN);
        signal(SIGUSR1, handler2);

        while (1)
        {
            close(fd[0]);
            sprintf(msg, "I send message %d times.\n", myclock);
            write(fd[1], msg, strlen(msg));
            myclock++;
            sleep(1);
        }
    }

    else if (pid1 > 0)
    {
        pid2 = fork();

        if (pid2 == 0)
        {
            signal(SIGINT, SIG_IGN);
            signal(SIGUSR1, handler2);

            while (1)
            {
                close(fd[1]);
                read(fd[0], buf, 64);
                printf("%s", buf);
            }
        }

        waitpid(pid1, NULL, 0);
        waitpid(pid2, NULL, 0);
        close(fd[0]);
        close(fd[1]);
        printf("Parent Process is killed!\n");
    }

    else
    {
        perror("fork");
        exit(1);
    }

    return 0;
}

来源：https://www.cnblogs.com/gzr2018/p/11909840.html