Blame include/ap_listen.h

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/* Licensed to the Apache Software Foundation (ASF) under one or more
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 * contributor license agreements.  See the NOTICE file distributed with
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 * this work for additional information regarding copyright ownership.
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 * The ASF licenses this file to You under the Apache License, Version 2.0
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 * (the "License"); you may not use this file except in compliance with
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 * the License.  You may obtain a copy of the License at
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 *
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 *     http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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/**
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 * @file  ap_listen.h
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 * @brief Apache Listeners Library
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 *
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 * @defgroup APACHE_CORE_LISTEN Apache Listeners Library
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 * @ingroup  APACHE_CORE
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 * @{
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 */
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#ifndef AP_LISTEN_H
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#define AP_LISTEN_H
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#include "apr_network_io.h"
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#include "httpd.h"
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#include "http_config.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct ap_slave_t ap_slave_t;
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typedef struct ap_listen_rec ap_listen_rec;
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typedef apr_status_t (*accept_function)(void **csd, ap_listen_rec *lr, apr_pool_t *ptrans);
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/**
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 * @brief Apache's listeners record.
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 *
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 * These are used in the Multi-Processing Modules
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 * to setup all of the sockets for the MPM to listen to and accept on.
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 */
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struct ap_listen_rec {
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    /**
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     * The next listener in the list
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     */
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    ap_listen_rec *next;
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    /**
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     * The actual socket
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     */
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    apr_socket_t *sd;
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    /**
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     * The sockaddr the socket should bind to
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     */
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    apr_sockaddr_t *bind_addr;
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    /**
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     * The accept function for this socket
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     */
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    accept_function accept_func;
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    /**
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     * Is this socket currently active
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     */
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    int active;
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    /**
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     * The default protocol for this listening socket.
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     */
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    const char* protocol;
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    ap_slave_t *slave;
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};
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/**
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 * The global list of ap_listen_rec structures
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 */
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AP_DECLARE_DATA extern ap_listen_rec *ap_listeners;
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AP_DECLARE_DATA extern int ap_num_listen_buckets;
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AP_DECLARE_DATA extern int ap_have_so_reuseport;
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/**
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 * Setup all of the defaults for the listener list
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 */
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AP_DECLARE(void) ap_listen_pre_config(void);
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/**
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 * Loop through the global ap_listen_rec list and create all of the required
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 * sockets.  This executes the listen and bind on the sockets.
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 * @param s The global server_rec
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 * @return The number of open sockets.
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 */
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AP_DECLARE(int) ap_setup_listeners(server_rec *s);
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/**
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 * This function duplicates ap_listeners into multiple buckets when configured
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 * to (see ListenCoresBucketsRatio) and the platform supports it (eg. number of
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 * online CPU cores and SO_REUSEPORT available).
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 * @param p The config pool
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 * @param s The global server_rec
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 * @param buckets The array of listeners buckets.
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 * @param num_buckets The total number of listeners buckets (array size).
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 * @remark If the given *num_buckets is 0 (input), it will be computed
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 *         according to the platform capacities, otherwise (positive) it
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 *         will be preserved. The number of listeners duplicated will
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 *         always match *num_buckets, be it computed or given.
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 */
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AP_DECLARE(apr_status_t) ap_duplicate_listeners(apr_pool_t *p, server_rec *s,
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                                                ap_listen_rec ***buckets,
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                                                int *num_buckets);
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/**
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 * Loop through the global ap_listen_rec list and close each of the sockets.
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 */
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AP_DECLARE_NONSTD(void) ap_close_listeners(void);
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/**
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 * Loop through the given ap_listen_rec list and close each of the sockets.
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 * @param listeners The listener to close.
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 */
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AP_DECLARE_NONSTD(void) ap_close_listeners_ex(ap_listen_rec *listeners);
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/**
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 * FIXMEDOC
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 */
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AP_DECLARE_NONSTD(int) ap_close_selected_listeners(ap_slave_t *);
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/* Although these functions are exported from libmain, they are not really
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 * public functions.  These functions are actually called while parsing the
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 * config file, when one of the LISTEN_COMMANDS directives is read.  These
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 * should not ever be called by external modules.  ALL MPMs should include
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 * LISTEN_COMMANDS in their command_rec table so that these functions are
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 * called.
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 */
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AP_DECLARE_NONSTD(const char *) ap_set_listenbacklog(cmd_parms *cmd, void *dummy, const char *arg);
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AP_DECLARE_NONSTD(const char *) ap_set_listencbratio(cmd_parms *cmd, void *dummy, const char *arg);
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AP_DECLARE_NONSTD(const char *) ap_set_listener(cmd_parms *cmd, void *dummy,
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                                                int argc, char *const argv[]);
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AP_DECLARE_NONSTD(const char *) ap_set_send_buffer_size(cmd_parms *cmd, void *dummy,
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                                                        const char *arg);
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AP_DECLARE_NONSTD(const char *) ap_set_receive_buffer_size(cmd_parms *cmd,
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                                                           void *dummy,
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                                                           const char *arg);
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#define LISTEN_COMMANDS \
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AP_INIT_TAKE1("ListenBacklog", ap_set_listenbacklog, NULL, RSRC_CONF, \
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  "Maximum length of the queue of pending connections, as used by listen(2)"), \
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AP_INIT_TAKE1("ListenCoresBucketsRatio", ap_set_listencbratio, NULL, RSRC_CONF, \
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  "Ratio between the number of CPU cores (online) and the number of listeners buckets"), \
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AP_INIT_TAKE_ARGV("Listen", ap_set_listener, NULL, RSRC_CONF, \
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  "A port number or a numeric IP address and a port number, and an optional protocol"), \
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AP_INIT_TAKE1("SendBufferSize", ap_set_send_buffer_size, NULL, RSRC_CONF, \
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  "Send buffer size in bytes"), \
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AP_INIT_TAKE1("ReceiveBufferSize", ap_set_receive_buffer_size, NULL, \
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              RSRC_CONF, "Receive buffer size in bytes")
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#ifdef __cplusplus
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}
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#endif
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#endif
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/** @} */