killpg
(void) killpg(pid, sig);
(void) killpg(pid, sig);
(void) killpg(ctpgrp, SIGHUP);
(void) killpg(pp->p_jobid, SIGCONT);
if (killpg(pp->p_jobid, signum) < 0) {
(void) killpg(pp->p_jobid, SIGCONT);
extern int killpg(pid_t, int);