NAME

       nng_listener_setopt - set listener option

SYNOPSIS

           #include <nng/nng.h>

           int nng_listener_setopt(nng_listener l, const char *opt, const void *val,
               size_t valsz);

           int nng_listener_setopt_bool(nng_listener l, const char *opt, bool bval);

           int nng_listener_setopt_int(nng_listener l, const char *opt, int ival);

           int nng_listener_setopt_ms(nng_listener l, const char *opt, nng_duration dur);

           int nng_listener_setopt_ptr(nng_listener l, const char *opt, void *ptr);

           int nng_listener_setopt_size(nng_listener l, const char *opt, size_t z);

           int nng_listener_setopt_string(nng_listener l, const char *opt, const char *str);

           int nng_listener_setopt_uint64(nng_listener l, const char *opt, uint64_t u64);

DESCRIPTION

           Important
           These functions are deprecated. Please see nng_listener_set. They may not be present
           if the library was built with NNG_ELIDE_DEPRECATED.

       The nng_listener_setopt() functions are used to configure options for the listener l. The
       actual options that may be configured in this way vary, and many are documented in
       nng_options(5).

       Additionally some transport-specific options are documented with the transports
       themselves.

           Note
           Once a listener has started, it is generally not possible to change its configuration.

   Forms
       In all of these forms, the option opt is configured on the listener l.

       The details of the type, size, and semantics of the option will depend on the actual
       option, and will be documented with the option itself.

           Tip
           It may be easier to use one of the typed forms of this function.

       nng_listener_setopt()
           This function is untyped, and can be used to configure any arbitrary data. The val
           pointer addresses the data to copy, and valsz is the size of the objected located at
           val.

       nng_listener_setopt_bool()
           This function is for options which take a Boolean (bool). The bval is passed to the
           option.

       nng_listener_setopt_int()
           This function is for options which take an integer (int). The ival is passed to the
           option.

       nng_listener_setopt_ms()
           This function is used to configure time durations (such as timeouts) using type
           nng_duration. The duration dur is an integer number of milliseconds.

       nng_listener_setopt_ptr()
           This function is used to pass a pointer, ptr, to structured data. The data referenced
           by ptr is generally managed by other functions. For example, TLS configuration objects
           created with (nng_tls_config_alloc()) can be passed this way.

           Note
           This form is somewhat special in that the object is generally not copied, but instead
           the pointer to the object is copied.

       nng_listener_setopt_size()
           This function is used to configure a size, z, typically for buffer sizes, message
           maximum sizes, and similar options.

       nng_listener_setopt_string()
           This function is used to pass configure a string, str. Strings passed this way must be
           legal UTF-8 or ASCII strings, terminated with a NUL (\0) byte. (Other constraints may
           apply as well, see the documentation for each option for details.)

       nng_listener_setopt_uint64()
           This function is used to configure a 64-bit unsigned value, u64. This is typically
           used for options related to identifiers, network numbers, and similar.

RETURN VALUES

       These functions return 0 on success, and non-zero otherwise.

ERRORS

       NNG_EBADTYPE
           Incorrect type for option.

       NNG_ECLOSED
           Parameter l does not refer to an open listener.

       NNG_EINVAL
           The value being passed is invalid.

       NNG_ENOTSUP
           The option opt is not supported.

       NNG_EREADONLY
           The option opt is read-only.

       NNG_ESTATE
           The listener l is already started.

SEE ALSO

       nng_listen(3), nng_listener_create(3) nng_listener_getopt(3) nng_setopt(3),
       nng_strerror(3), nng_duration(5), nng_listener(5), nng_options(5), nng(7)

                                            2024-10-11                     NNG_LISTENER_SETOPT(3)