#include
#include
#include
#include
int main(int argc, char *argv[]){
int pid = getpid();
printf(“Parent: PID = %d, PPID = %d, PGID = %d\n”,pid,getppid(),getpgid(pid));
if ((pid = fork())==0){
printf(“Child: PID = %d, PPID = %d, PGID = %d\n”,
getpid(),getppid(),getpgid(getpid()));
exit(1);
}
sleep(5);
}