nng_socket_id3
Return numeric socket identifier
Usage
#include <nng/nng.h> int nng_socket_id(nng_socket s);
Overview
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.
Return values
This function returns the positive value for the socket identifier, or -1 if the socket is invalid.
Errors
None.