HelenOS sources

TCP_DST_PORT      133 uspace/app/pcapcat/eth_parser.c 	if (size < TCP_DST_PORT + TCP_PORT_SIZE) {
TCP_DST_PORT      139 uspace/app/pcapcat/eth_parser.c 	uint16_t dst_port = BIG_END_16(buffer, TCP_DST_PORT);
HelenOS homepage, sources at GitHub