60 lines
1.7 KiB
Text
60 lines
1.7 KiB
Text
= nng_msg_get_pipe(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_msg_get_pipe - get pipe for message
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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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nng_pipe nng_msg_get_pipe(nng_msg *msg);
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----
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== DESCRIPTION
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The `nng_msg_get_pipe()` returns the xref:nng_pipe.5.adoc[`nng_pipe`] object
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associated with message _msg_.
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On receive, this is the pipe from which a message was received.
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On transmit, this would be the pipe that the message should be delivered
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to, if a specific peer is required.
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NOTE: Not all protocols support overriding the destination pipe.
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The most usual use case for this is to obtain information about the peer
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from which the message was received.
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This can be used to provide different behaviors for different peers, such as
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a higher level of authentication for peers located on an untrusted network.
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The xref:nng_pipe_getopt.3.adoc[`nng_pipe_getopt()`] function
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is useful in this situation.
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== RETURN VALUES
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This function returns the pipe associated with this message, which will
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be a positive value.
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If the pipe is non-positive, then that indicates that
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no specific pipe is associated with the message.
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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_msg_alloc.3.adoc[nng_msg_alloc(3)],
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xref:nng_msg_set_pipe.3.adoc[nng_msg_set_pipe(3)],
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xref:nng_pipe_getopt.3.adoc[nng_pipe_getopt(3)],
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xref:nng.7.adoc[nng(7)]
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