protocol number of TCP ; see getprotoent (3). The arguments optval and optlen are used ... system. SEE ALSO ioctl (2), socket (2), getprotoent (3), protocols (5), ip (7), packetprotocol number of TCP ; see getprotoent (3). The arguments optval and optlen are used ... system. SEE ALSO ioctl (2), socket (2), getprotoent (3), protocols (5), ip (7), packettake place; see protocols (5). See getprotoent (3) on how to map protocol name strings ... shutdown (2), socketpair (2), write (2), getprotoent (3), address_families (7), ip (7), s…