父进程异常退出时，杀死所以子进程

淩亂°似流年 2022-06-09 13:16 271阅读 0赞

#include <stdio.h>
    #include <unistd.h>
    #include <sys/types.h>
    #include <stdlib.h>
    #include <sys/prctl.h>
    #include <signal.h>
    
    
    
    void my_system(const char*cmd)
    {
        pid_t pid;
        pid = fork();
        if (pid == 0)
        {
            prctl(PR_SET_PDEATHSIG, SIGHUP);
            execl("/bin/bash", "/bin/bash", "-c", cmd, NULL);
            exit(0);
        } else if (pid < 0)
        {
            printf("create failed\n");
        }
    }
    
    int main()
    {
        int i = 0;
        my_system("./tstprogram");
        while (5)
        {
            printf("a\n");
            sleep(1);
            i++;
        }
        return 0;
    }
    
    #include<string.h>
    #include<sys/prctl.h>
    #include<signal.h>
    #include<unistd.h>
    #include <stdlib.h>
    
    static int do_abort = 0;
    
    void handle_signal(int signo) {
        if (signo == SIGHUP) {
            printf("child recv SIGHUP..\n");
            do_abort = 1;
        }
    }
    
    int main(void) {
        pid_t pid;
        pid = fork();
        char *p = NULL;
        if (pid == 0) {
            signal(SIGHUP, handle_signal);
            prctl(PR_SET_PDEATHSIG, SIGHUP);
            while (!do_abort) {
                sleep(1);
                printf("in child...%d\n", getpid());
            }
            printf("child exit...%d\n", getpid());
            exit(0);
            return 0;
        }
        else {
            int times = 5;
            while (times-- > 0) {
                sleep(1);
                if (times == 3) {
                    printf("memcpy ...\n");
                    memcpy(p, "Hello", 5);
                }
                printf("in parent.%d\n", getpid());
            }
            printf("parent exit..\n");
            return 0;
        }
        return 0;
    }