nng_socket_proto_id3
Obtain the socket protocol id
Usage
#include <nng/nng.h> int nng_socket_proto_id(nng_socket s, uint16_t *id); int nng_socket_peer_id(nng_socket s, uint16_t *id);
Overview
These functions store the 16-bit protocol identifier of either the socket s, or its natural peer, in id.
Tip
These functions should be used in place of the NNG_OPT_PROTO and NNG_OPT_PEER options in new code.
Return values
These functions return zero on success, or an error if the socket is invalid.
Errors
NNG_ECLOSED
Parameter s does not refer to an open socket.