prison_ischild
: !prison_ischild(mypr, pr)) {
prison_ischild(mypr, pr)) {
prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
if (prison_ischild(pr1, pr2)) {
prison_ischild(rpr, msqkptr->cred->cr_prison)))
prison_ischild(rpr, semakptr->cred->cr_prison)))
prison_ischild(rpr, shmseg->cred->cr_prison)))
bool prison_ischild(struct prison *, struct prison *);