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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file http_connection.h
* @brief Apache connection library
*
* @defgroup APACHE_CORE_CONNECTION Connection Library
* @ingroup APACHE_CORE
* @{
*/
#ifndef APACHE_HTTP_CONNECTION_H
#define APACHE_HTTP_CONNECTION_H
#include "apr_network_io.h"
#include "apr_buckets.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* This is the protocol module driver. This calls all of the
* pre-connection and connection hooks for all protocol modules.
* @param c The connection on which the request is read
* @param csd The mechanism on which this connection is to be read.
* Most times this will be a socket, but it is up to the module
* that accepts the request to determine the exact type.
*/
AP_CORE_DECLARE(void) ap_process_connection(conn_rec *c, void *csd);
/**
* Shutdown the connection for writing.
* @param c The connection to shutdown
* @param flush Whether or not to flush pending data before
* @return APR_SUCCESS or the underlying error
*/
AP_CORE_DECLARE(apr_status_t) ap_shutdown_conn(conn_rec *c, int flush);
/**
* Flushes all remain data in the client send buffer
* @param c The connection to flush
* @remark calls ap_shutdown_conn(c, 1)
*/
AP_CORE_DECLARE(void) ap_flush_conn(conn_rec *c);
/**
* This function is responsible for the following cases:
* <pre>
* we now proceed to read from the client until we get EOF, or until
* MAX_SECS_TO_LINGER has passed. The reasons for doing this are
* documented in a draft:
*
* http://tools.ietf.org/html/draft-ietf-http-connection-00.txt
*
* in a nutshell -- if we don't make this effort we risk causing
* TCP RST packets to be sent which can tear down a connection before
* all the response data has been sent to the client.
* </pre>
* @param c The connection we are closing
*/
AP_DECLARE(void) ap_lingering_close(conn_rec *c);
AP_DECLARE(int) ap_prep_lingering_close(conn_rec *c);
AP_DECLARE(int) ap_start_lingering_close(conn_rec *c);
/* Hooks */
/**
* create_connection is a RUN_FIRST hook which allows modules to create
* connections. In general, you should not install filters with the
* create_connection hook. If you require vhost configuration information
* to make filter installation decisions, you must use the pre_connection
* or install_network_transport hook. This hook should close the connection
* if it encounters a fatal error condition.
*
* @param p The pool from which to allocate the connection record
* @param server The server record to create the connection too.
* @param csd The socket that has been accepted
* @param conn_id A unique identifier for this connection. The ID only
* needs to be unique at that time, not forever.
* @param sbh A handle to scoreboard information for this connection.
* @param alloc The bucket allocator to use for all bucket/brigade creations
* @return An allocated connection record or NULL.
*/
AP_DECLARE_HOOK(conn_rec *, create_connection,
(apr_pool_t *p, server_rec *server, apr_socket_t *csd,
long conn_id, void *sbh, apr_bucket_alloc_t *alloc))
/**
* This hook gives protocol modules an opportunity to set everything up
* before calling the protocol handler. All pre-connection hooks are
* run until one returns something other than ok or decline
* @param c The connection on which the request has been received.
* @param csd The mechanism on which this connection is to be read.
* Most times this will be a socket, but it is up to the module
* that accepts the request to determine the exact type.
* @return OK or DECLINED
*/
AP_DECLARE_HOOK(int,pre_connection,(conn_rec *c, void *csd))
/**
* This hook implements different protocols. After a connection has been
* established, the protocol module must read and serve the request. This
* function does that for each protocol module. The first protocol module
* to handle the request is the last module run.
* @param c The connection on which the request has been received.
* @return OK or DECLINED
*/
AP_DECLARE_HOOK(int,process_connection,(conn_rec *c))
/**
* This hook implements different protocols. Before a connection is closed,
* protocols might have to perform some housekeeping actions, such as
* sending one last goodbye packet. The connection is, unless some other
* error already happened before, still open and operational.
* All pre-close-connection hooks are run until one returns something
* other than ok or decline
* @param c The connection on which the request has been received.
* @return OK or DECLINED
*/
AP_DECLARE_HOOK(int,pre_close_connection,(conn_rec *c))
/**
* This is a wrapper around ap_run_pre_connection. In case that
* ap_run_pre_connection returns an error it marks the connection as
* aborted and ensures that the basic connection setup normally done
* by the core module is done in case it was not done so far.
* @param c The connection on which the request has been received.
* Same as for the pre_connection hook.
* @param csd The mechanism on which this connection is to be read.
* Most times this will be a socket, but it is up to the module
* that accepts the request to determine the exact type.
* Same as for the pre_connection hook.
* @return The result of ap_run_pre_connection
*/
AP_DECLARE(int) ap_pre_connection(conn_rec *c, void *csd);
/** End Of Connection (EOC) bucket */
AP_DECLARE_DATA extern const apr_bucket_type_t ap_bucket_type_eoc;
/**
* Determine if a bucket is an End Of Connection (EOC) bucket
* @param e The bucket to inspect
* @return true or false
*/
#define AP_BUCKET_IS_EOC(e) (e->type == &ap_bucket_type_eoc)
/**
* Make the bucket passed in an End Of Connection (EOC) bucket
* @param b The bucket to make into an EOC bucket
* @return The new bucket, or NULL if allocation failed
*/
AP_DECLARE(apr_bucket *) ap_bucket_eoc_make(apr_bucket *b);
/**
* Create a bucket referring to an End Of Connection (EOC). This indicates
* that the connection will be closed.
* @param list The freelist from which this bucket should be allocated
* @return The new bucket, or NULL if allocation failed
*/
AP_DECLARE(apr_bucket *) ap_bucket_eoc_create(apr_bucket_alloc_t *list);
#ifdef __cplusplus
}
#endif
#endif /* !APACHE_HTTP_CONNECTION_H */
/** @} */
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