pgrp_find
pgrp = pgrp_find(pgid);
pgrp = pgrp_find(-pgid);
pg = pgrp_find(-pid);
pgrp_find(curp->p_pid)))
pgrp = pgrp_find(pg_id);
else if ((pg = pgrp_find(who)) == NULL)
else if ((pg = pgrp_find(who)) == NULL)
pgrp = pgrp_find(pgid);
pgrp = pgrp_find(-pgid);
pgrp = pgrp_find(pgid);
struct pgrp * pgrp_find(pid_t); /* Find process group by ID */