re_exchange()
public
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static VALUE
p_uid_exchange(VALUE obj)
{
rb_uid_t uid;
rb_uid_t euid;
check_uid_switch();
uid = getuid();
euid = geteuid();
if (setresuid(euid, uid, uid) < 0) rb_sys_fail(0);
SAVED_USER_ID = uid;
if (setreuid(euid,uid) < 0) rb_sys_fail(0);
SAVED_USER_ID = uid;
rb_notimplement();
return UIDT2NUM(uid);
}