#include <unistd.h>     /* standard unix functions, like getpid()       */
#include <sys/types.h>  /* various type definitions, like pid_t         */
#include <signal.h>     /* signal name macros, and the kill() prototype */
#include <stdio.h>
main (){
/* first, find my own process ID */
pid_t my_pid = getpid();
fprintf(stdout,"my pid is %d\n",my_pid);
/* now that i got my PID, send myself the STOP signal. */
kill(my_pid, SIGSTOP);
fprintf(stdout,"process %d is now finishing\n",my_pid);
}