kill parent and child process sametime

#include <stdio.h> //#include <sys/mount.h> #include <signal.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <sys/wait.h> int main(int argc, char *argv[]) { //    signal(SIGALRM, timer_handler); // add handler about sigalrm     pid_t pid, child_pid;     int rc=0;     pid = fork();     if (pid == 0){ // child printf("[child] I'm child(%d)\n", getpid());         //char *argvs[] = {~~~~~~~, (char *)0};         //return execv(~~~~~~~~~); // run other program  pid_t ppid = getppid(); pid_t pgid = getpgrp(); pid = getpid(); printf("[child] I will kill parent(%d)\n", ppid); sleep(1); printf("[child] kill parent(%d) now\n", ppid); rc = kill(ppid, 9); // kill parent printf("[child] rc = %d\n", rc); sleep(1); kill(0, SIGTERM); // kill self printf("[child] rc = %d\n", rc); #if 1 while(1) { sleep(1); printf("[child] rc = %d\n", rc); } #endif return 0;     }     else if (pid>0){ // parent printf("[Parent] I'm Parent(%d)\n", getpid());         child_pid = pid; //        alarm(30);         waitpid(pid, NULL, 0); printf("[Parent] wait done\n");     }     else{         perror("fork");         return 1;     } /*     if (mount("/dev/sdg1", "/media/flashCorsaire/", "fuseblk",                MS_MGC_VAL,"rw,nosuid,nodev,allow_other,blksize=4096") != 0)     {         fprintf(stderr, "Error: The program doesn't seem to be able ");         fprintf(stderr, "to control the USB device\n");         fprintf(stderr, "%s\n", strerror(errno));         return 1;     } */ printf("Hello, World! rc = %d\n", rc);     return 0; }