= nng_listener_set(3)
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//
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// Copyright 2020 Staysail Systems, Inc. <info@staysail.tech>
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// Copyright 2018 Capitar IT Group BV <info@capitar.com>
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//
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// This document is supplied under the terms of the MIT License, a
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// copy of which should be located in the distribution where this
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// file was obtained (LICENSE.txt). A copy of the license may also be
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// found online at https://opensource.org/licenses/MIT.
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//
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== NAME
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nng_listener_set - set listener option
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== SYNOPSIS
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[source, c]
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----
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#include <nng/nng.h>
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int nng_listener_set(nng_listener l, const char *opt, const void *val,
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size_t valsz);
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int nng_listener_set_bool(nng_listener l, const char *opt, bool bval);
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int nng_listener_set_int(nng_listener l, const char *opt, int ival);
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int nng_listener_set_ms(nng_listener l, const char *opt, nng_duration dur);
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int nng_listener_set_ptr(nng_listener l, const char *opt, void *ptr);
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int nng_listener_set_size(nng_listener l, const char *opt, size_t z);
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int nng_listener_set_string(nng_listener l, const char *opt, const char *str);
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int nng_listener_set_uint64(nng_listener l, const char *opt, uint64_t u64);
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----
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== DESCRIPTION
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(((options, listener)))
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The `nng_listener_set()` functions are used to configure options for
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the xref:nng_listener.5.adoc[listener] _l_.
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The actual options that may be configured in this way
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vary, and many are documented in xref:nng_options.5.adoc[nng_options(5)].
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Additionally some transport-specific options are documented with the transports themselves.
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NOTE: Once a listener has started, it is generally not possible to change
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its configuration.
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=== Forms
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In all of these forms, the option _opt_ is configured on the listener _l_.
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The details of the type, size, and semantics of the option will depend
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on the actual option, and will be documented with the option itself.
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TIP: It may be easier to use one of the typed forms of this function.
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`nng_listener_set()`::
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This function is untyped, and can be used to configure any arbitrary data.
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The _val_ pointer addresses the data to copy, and _valsz_ is the
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size of the objected located at _val_.
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`nng_listener_set_bool()`::
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This function is for options which take a Boolean (`bool`).
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The _bval_ is passed to the option.
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`nng_listener_set_int()`::
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This function is for options which take an integer (`int`).
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The _ival_ is passed to the option.
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`nng_listener_set_ms()`::
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This function is used to configure time durations (such as timeouts) using
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type xref:nng_duration.5.adoc[`nng_duration`].
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The duration _dur_ is an integer number of milliseconds.
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`nng_listener_set_ptr()`::
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This function is used to pass a pointer, _ptr_, to structured data.
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The data referenced by _ptr_ is generally managed by other functions.
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For example, TLS configuration objects created with
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(xref:nng_tls_config_alloc.3tls.adoc[`nng_tls_config_alloc()`])
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can be passed this way.
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NOTE: This form is somewhat special in that the object is generally
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not copied, but instead the *pointer* to the object is copied.
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`nng_listener_set_size()`::
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This function is used to configure a size, _z_, typically for buffer sizes,
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message maximum sizes, and similar options.
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`nng_listener_set_string()`::
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This function is used to pass configure a string, _str_.
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Strings passed this way must be legal UTF-8 or ASCII strings, terminated
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with a `NUL` (`\0`) byte.
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(Other constraints may apply as well, see the documentation for each option
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for details.)
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`nng_listener_set_uint64()`::
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This function is used to configure a 64-bit unsigned value, _u64_.
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This is typically used for options related to identifiers, network numbers,
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and similar.
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== RETURN VALUES
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These functions return 0 on success, and non-zero otherwise.
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== ERRORS
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[horizontal]
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`NNG_EBADTYPE`:: Incorrect type for option.
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`NNG_ECLOSED`:: Parameter _l_ does not refer to an open listener.
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`NNG_EINVAL`:: The value being passed is invalid.
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`NNG_ENOTSUP`:: The option _opt_ is not supported.
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`NNG_EREADONLY`:: The option _opt_ is read-only.
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`NNG_ESTATE`:: The listener _l_ is already started.
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== SEE ALSO
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[.text-left]
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xref:nng_listen.3.adoc[nng_listen(3)],
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xref:nng_listener_create.3.adoc[nng_listener_create(3)]
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xref:nng_listener_get.3.adoc[nng_listener_get(3)]
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xref:nng_socket_set.3.adoc[nng_socket_set(3)],
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xref:nng_strerror.3.adoc[nng_strerror(3)],
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xref:nng_duration.5.adoc[nng_duration(5)],
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xref:nng_listener.5.adoc[nng_listener(5)],
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xref:nng_options.5.adoc[nng_options(5)],
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xref:nng.7.adoc[nng(7)]
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