52 lines
1.3 KiB
Text
52 lines
1.3 KiB
Text
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= nng_socket_id(3)
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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_id - return numeric socket identifier
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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_socket_id(nng_socket s);
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----
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== DESCRIPTION
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The `nng_socket_id()` function returns a positive identifier for the socket _s_,
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if it is valid.
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Otherwise it returns `-1`.
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NOTE: A socket is considered valid if it was ever opened with a protocol
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constructor, such as the xref:nng_req_open.3.adoc[`nng_req0_open()`] function.
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Sockets that are allocated on the stack or statically should be
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initialized with the macro
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xref:nng_socket.5.adoc#NNG_SOCKET_INITIALIZER[`NNG_SOCKET_INITIALIZER`]
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to ensure that they cannot be confused with a valid socket before they are opened.
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== RETURN VALUES
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This function returns the positive value for the socket identifier, or
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`-1` if the socket is invalid.
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== ERRORS
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None.
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== SEE ALSO
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[.text-left]
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xref:nng_socket.5.adoc[nng_socket(5)],
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xref:nng.7.adoc[nng(7)]
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