#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;
}