= nng_http_handler_set_data(3http)
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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_http_handler_set_data - set extra data for HTTP handler
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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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#include <nng/supplemental/http/http.h>
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int nng_http_handler_set_data(nng_http_handler *handler, void *data,
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void (*dtor)(void *));
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----
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== DESCRIPTION
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The `nng_http_handler_set_data()` function is used to set an additional
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_data_ for the _handler_.
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The stored _data_ can be retrieved later in the handler function using
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xref:nng_http_handler_get_data.3http.adoc[`nng_http_handler_get_data()`].
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Additionally, when the handler is deallocated, if _dtor_ is not `NULL`,
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then it will be called with _data_ as its argument.
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The intended use of
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this function is deallocate any resources associated with _data_.
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== RETURN VALUES
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This function returns 0 on success, and non-zero otherwise.
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== ERRORS
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[horizontal]
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`NNG_ENOMEM`:: Insufficient free memory to perform the operation.
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`NNG_ENOTSUP`:: No support for HTTP in the library.
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== SEE ALSO
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[.text-left]
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xref:nng_http_handler_alloc.3http.adoc[nng_http_handler_alloc(3http)],
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xref:nng_http_handler_get_data.3http.adoc[nng_http_server_get_data(3http)],
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xref:nng_http_server_add_handler.3http.adoc[nng_http_server_add_handler(3http)],
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xref:nng.7.adoc[nng(7)]
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