This documentation is for version v1.3.0 of NNG, but the latest released version is v1.7.2. see the documentation for v1.7.2 for the most up-to-date information.

SYNOPSIS

#include <nng/nng.h>

int nng_listener_id(nng_listener l);

DESCRIPTION

The nng_listener_id() function returns a positive identifier for the listener l, if it is valid. Otherwise it returns -1.

A listener is considered valid if it was ever created with the nng_listener_create() or nng_listen() functions. listeners that are allocated on the stack or statically should be initialized with the macro NNG_LISTENER_INITIALIZER to ensure that they cannot be confused with a valid listener before they are created properly.

RETURN VALUES

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

ERRORS

None.