waitforjob
exitstatus = waitforjob(jp, &signaled);
exitstatus = waitforjob(jp, (int *)NULL);
exitstatus = waitforjob(jp, (int *)NULL);
exitstatus = waitforjob(in.jp, (int *)NULL);
status = waitforjob(jp, (int *)NULL);
int waitforjob(struct job *, int *);