NAME

       nng_listener_id - return numeric listener identifier

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.

           Note

           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.

SEE ALSO

       nng_listener(5), nng(7)

                                                   2025-04-20                                 NNG_LISTENER_ID(3)