linux下C++pidに従ってプログラムプロセスを閉じる

#include
#include
#include
#include
main()
{
pid_t pid;
int status;
if(!(pid= fork())){
printf(“Hi I am child process!
”);
sleep(10);
return;
}
else{
printf(“send signal to child process (%d) 
”,pid);
sleep(1);
kill(pid ,SIGABRT);    // pid       SIGABRT（      ）  
wait(&status);
if(WIFSIGNALED(status))
printf(“chile process receive signal %d
”,WTERMSIG(status));
}
}

send signal to child processの実行(3170)
Hi I am child process!
child process receive signal 6