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.
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RETURN VALUES
This function returns the positive value for the listener identifier, or
-1 if the listener is invalid.
ERRORS
None.