nng_socket_id - return numeric socket identifier

       The nng_socket_id() function returns a positive identifier for the socket s, if it is valid. Otherwise it
       returns -1.

           Note

           A socket is considered valid if it was ever opened with a protocol constructor, such as the
           nng_req0_open() function. Sockets that are allocated on the stack or statically should be initialized
           with the macro NNG_SOCKET_INITIALIZER to ensure that they cannot be confused with a valid socket
           before they are opened.

       None.

       nng_socket_id - return numeric socket identifier

       This function returns the positive value for the socket identifier, or -1 if the socket is invalid.

nng_socket(5), nng(7)

                                                   2025-04-20                                   NNG_SOCKET_ID(3)

           #include <nng/nng.h>

           int nng_socket_id(nng_socket s);