getprotobynumber_r
int getprotobynumber_r(int, struct protoent *,
PROTO_NORMAL(getprotobynumber_r);
DEF_WEAK(getprotobynumber_r);
if (getprotobynumber_r(num, &proto, &_protoent_data) != 0)
r = getprotobynumber_r(35, &protoent, &protoent_data);
r = getprotobynumber_r(256, &protoent, &protoent_data);