72 lines
2.2 KiB
Text
72 lines
2.2 KiB
Text
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= nng_socket(5)
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//
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// Copyright 2018 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_socket - socket handle
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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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typedef struct nng_socket_s nng_socket;
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----
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== DESCRIPTION
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An `nng_socket`(((socket))) is a handle to an underlying socket object.
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All communication between the application and remote Scalability Protocol
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peers is done through sockets.
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A given socket can have multiple dialers (xref:nng_dialer.5.adoc[`nng_dialer`])
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and/or listeners (xref:nng_listener.5.adoc[`nng_listener`]), and multiple
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pipes (xref:nng_pipe.5.adoc[`nng_pipe`]), and
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may be connected to multiple transports at the same time.
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However, a given socket will have exactly one protocol associated with it,
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and is responsible for any state machines or other protocol-specific logic.
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IMPORTANT: The `nng_socket` structure is always passed by value (both
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for input parameters and return values), and should be treated opaquely.
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Passing structures this way gives the compiler a chance to perform
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accurate type checks in functions passing values of this type.
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Each `nng_socket` is created by a protocol-specific constructor, such as
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xref:nng_rep_open.3.adoc[`nng_rep_open()`].
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When the socket is no longer needed, it can be closed with
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xref:nng_close.3.adoc[`nng_close()`].
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[[NNG_SOCKET_INITIALIZER]]
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=== Initialization
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A socket may be initialized using the macro `NNG_SOCKET_INITIALIZER`
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before it is opened, to prevent confusion with valid open sockets.
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For example:
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[source, c]
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----
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nng_socket s = NNG_SOCKET_INITIALIZER;
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----
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== SEE ALSO
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[.text-left]
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xref:libnng.3.adoc[libnng(3)],
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xref:nng_close.3.adoc[nng_close(3)],
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xref:nng_getopt.3.adoc[nng_getopt(3)],
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xref:nng_setopt.3.adoc[nng_setopt(3)],
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xref:nng_socket_id.3.adoc[nng_socket_id(3)],
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xref:nng_dialer.5.adoc[nng_dialer(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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