pgfind
if (pgfind(pid) != NULL)
pg = pgfind(-pid);
if (pr->ps_pgid == pid || pgfind(pid) != NULL) {
if ((pgrp = pgfind(pgid)) == NULL) {
else if ((pg = pgfind(SCARG(uap, who))) == NULL)
else if ((pg = pgfind(SCARG(uap, who))) == NULL)
pgrp = pgfind(-pgid);
pgrp = pgfind(pgid);
struct pgrp *pgrp = pgfind(*(int *)data);
pgrp = pgfind(-pgid);
struct pgrp *pgfind(pid_t); /* Find process group by id. */