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authorGarrett D'Amore <garrett@damore.org>2025-01-14 08:26:14 -0800
committerGarrett D'Amore <garrett@damore.org>2025-01-14 08:26:14 -0800
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docs: pipe documentation
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-= nng_pipe_notify(3)
-//
-// Copyright 2019 Staysail Systems, Inc. <info@staysail.tech>
-// Copyright 2018 Capitar IT Group BV <info@capitar.com>
-// Copyright 2019 Devolutions <info@devolutions.net>
-//
-// This document is supplied under the terms of the MIT License, a
-// copy of which should be located in the distribution where this
-// file was obtained (LICENSE.txt). A copy of the license may also be
-// found online at https://opensource.org/licenses/MIT.
-//
-
-== NAME
-
-nng_pipe_notify - register pipe notification callback
-
-== SYNOPSIS
-
-[source, c]
-----
-#include <nng/nng.h>
-
-typedef enum {
- NNG_PIPE_EV_ADD_PRE,
- NNG_PIPE_EV_ADD_POST,
- NNG_PIPE_EV_REM_POST,
-} nng_pipe_ev;
-
-typedef void (*nng_pipe_cb)(nng_pipe, nng_pipe_ev, void *);
-
-int nng_pipe_notify(nng_socket s, nng_pipe_ev ev, nng_pipe_cb cb, void *arg);
-----
-
-== DESCRIPTION
-
-The `nng_pipe_notify()` function registers the callback function _cb_
-to be called whenever a xref:nng_pipe.5.adoc[pipe] the pipe event specified by
-_ev_ occurs on the socket _s_.
-The callback _cb_ will be passed _arg_ as its final argument.
-
-A different callback may be supplied for each event.
-Each event may have at most one callback registered.
-Registering a callback implicitly unregisters any previously registered.
-
-The following pipe events are supported:
-
-`NNG_PIPE_EV_ADD_PRE`:: This event occurs after a connection and negotiation
-has completed, but before the pipe is added to the socket.
-If the pipe is closed (using xref:nng_pipe_close.3.adoc[`nng_pipe_close()`]) at
-this point, the socket will never see the pipe, and no further events will
-occur for the given pipe.
-
-`NNG_PIPE_EV_ADD_POST`:: This event occurs after the pipe is fully added to
-the socket.
-Prior to this time, it is not possible to communicate over the pipe with
-the socket.
-
-`NNG_PIPE_EV_REM_POST`:: This event occurs after the pipe has been removed
-from the socket.
-The underlying transport may be closed at this point, and it is not
-possible communicate using this pipe.
-
-WARNING: The callback _cb_ function must *not* attempt to perform any
-accesses to the socket, as it is called with a lock on the socket held!
-Doing so would thus result in a deadlock.
-
-TIP: The callback _cb_ may close a pipe for any reason by simply closing
-it using xref:nng_pipe_close.3.adoc[`nng_pipe_close()`].
-This might be done before the pipe is added to the socket (during
-`NNG_PIPE_EV_ADD_PRE`), for example, if the remote peer is not authorized.
-
-TIP: It is possible to register the same _cb_ and _arg_ for different events
-by calling this function separately for different values of _ev_.
-
-NOTE: This function ignores invalid values for _ev_.
-
-== RETURN VALUES
-
-This function returns 0 on success, and non-zero otherwise.
-
-== ERRORS
-
-[horizontal]
-`NNG_ECLOSED`:: The socket _s_ does not refer to an open socket.
-
-== SEE ALSO
-
-[.text-left]
-xref:nng_pipe_close.3.adoc[nng_pipe_close(3)],
-xref:nng_pipe_get.3.adoc[nng_pipe_get(3)],
-xref:nng_pipe.5.adoc[nng_pipe(5)],
-xref:nng_socket.5.adoc[nng_socket(5)],
-xref:nng.7.adoc[nng(7)]