/* 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  ap_mpm.h
 * @brief Module Magic Number
 *
 * @defgroup APACHE_CORE_MMN Module Magic Number
 * @ingroup  APACHE_CORE
 * @{
 */

#ifndef APACHE_AP_MMN_H
#define APACHE_AP_MMN_H

/*
 * MODULE_MAGIC_NUMBER_MAJOR
 * Major API changes that could cause compatibility problems for older modules
 * such as structure size changes.  No binary compatibility is possible across
 * a change in the major version.
 *
 * MODULE_MAGIC_NUMBER_MINOR
 * Minor API changes that do not cause binary compatibility problems.
 * Should be reset to 0 when upgrading MODULE_MAGIC_NUMBER_MAJOR.
 *
 * See the MODULE_MAGIC_AT_LEAST macro below for an example.
 */

/*
 * 20010224   (2.0.13-dev) MODULE_MAGIC_COOKIE reset to "AP20"
 * 20010523   (2.0.19-dev) bump for scoreboard structure reordering
 * 20010627   (2.0.19-dev) more API changes than I can count
 * 20010726   (2.0.22-dev) more big API changes
 * 20010808   (2.0.23-dev) dir d_is_absolute bit introduced, bucket changes, etc
 * 20010825   (2.0.25-dev) removed d_is_absolute, introduced map_to_storage hook
 * 20011002   (2.0.26-dev) removed 1.3-deprecated request_rec.content_language
 * 20011127   (2.0.29-dev) bump for postconfig hook change, and removal of
 *                         socket from connection record
 * 20011212   (2.0.30-dev) bump for new used_path_info member of request_rec
 * 20011218   (2.0.30-dev) bump for new sbh member of conn_rec, different
 *                         declarations for scoreboard, new parameter to
 *                         create_connection hook
 * 20020102   (2.0.30-dev) bump for changed type of limit_req_body in
 *                         core_dir_config
 * 20020109   (2.0.31-dev) bump for changed shm and scoreboard declarations
 * 20020111   (2.0.31-dev) bump for ETag fields added at end of cor_dir_config
 * 20020114   (2.0.31-dev) mod_dav changed how it asks its provider to fulfill
 *                         a GET request
 * 20020118   (2.0.31-dev) Input filtering split of blocking and mode
 * 20020127   (2.0.31-dev) bump for pre_mpm hook change
 * 20020128   (2.0.31-dev) bump for pre_config hook change
 * 20020218   (2.0.33-dev) bump for AddOutputFilterByType directive
 * 20020220   (2.0.33-dev) bump for scoreboard.h structure change
 * 20020302   (2.0.33-dev) bump for protocol_filter additions.
 * 20020306   (2.0.34-dev) bump for filter type renames.
 * 20020318   (2.0.34-dev) mod_dav's API for REPORT generation changed
 * 20020319   (2.0.34-dev) M_INVALID changed, plus new M_* methods for RFC 3253
 * 20020327   (2.0.35-dev) Add parameter to quick_handler hook
 * 20020329   (2.0.35-dev) bump for addition of freelists to bucket API
 * 20020329.1 (2.0.36)     minor bump for new arg to opt fn ap_cgi_build_command
 * 20020506   (2.0.37-dev) Removed r->boundary in request_rec.
 * 20020529   (2.0.37-dev) Standardized the names of some apr_pool_*_set funcs
 * 20020602   (2.0.37-dev) Bucket API change (metadata buckets)
 * 20020612   (2.0.38-dev) Changed server_rec->[keep_alive_]timeout to apr time
 * 20020625   (2.0.40-dev) Changed conn_rec->keepalive to an enumeration
 * 20020628   (2.0.40-dev) Added filter_init to filter registration functions
 * 20020903   (2.0.41-dev) APR's error constants changed
 * 20020903.1 (2.1.0-dev)  allow_encoded_slashes added to core_dir_config
 * 20020903.2 (2.0.46-dev) add ap_escape_logitem
 * 20030213.1 (2.1.0-dev)  changed log_writer optional fn's to return previous
 *                         handler
 * 20030821   (2.1.0-dev)  bumped mod_include's entire API
 * 20030821.1 (2.1.0-dev)  added XHTML doctypes
 * 20030821.2 (2.1.0-dev)  added ap_escape_errorlog_item
 * 20030821.3 (2.1.0-dev)  added ap_get_server_revision / ap_version_t
 * 20040425   (2.1.0-dev)  removed ap_add_named_module API
 *                         changed ap_add_module, ap_add_loaded_module,
 *                         ap_setup_prelinked_modules,
 *                         ap_process_resource_config
 * 20040425.1 (2.1.0-dev)  Added ap_module_symbol_t and
 *                         ap_prelinked_module_symbols
 * 20050101.0 (2.1.2-dev)  Axed misnamed http_method for http_scheme
 *                         (which it was!)
 * 20050127.0 (2.1.3-dev)  renamed regex_t->ap_regex_t,
 *                         regmatch_t->ap_regmatch_t, REG_*->AP_REG_*,
 *                         removed reg* in place of ap_reg*; added ap_regex.h
 * 20050217.0 (2.1.3-dev)  Axed find_child_by_pid, mpm_*_completion_context
 *                         (winnt mpm) symbols from the public sector, and
 *                         decorated real_exit_code with ap_ in the win32/os.h.
 * 20050305.0 (2.1.4-dev)  added pid and generation fields to worker_score
 * 20050305.1 (2.1.5-dev)  added ap_vhost_iterate_given_conn.
 * 20050305.2 (2.1.5-dev)  added AP_INIT_TAKE_ARGV.
 * 20050305.3 (2.1.5-dev)  added Protocol Framework.
 * 20050701.0 (2.1.7-dev)  Bump MODULE_MAGIC_COOKIE to "AP21"!
 * 20050701.1 (2.1.7-dev)  trace_enable member added to core server_config
 * 20050708.0 (2.1.7-dev)  Bump MODULE_MAGIC_COOKIE to "AP22"!
 * 20050708.1 (2.1.7-dev)  add proxy request_status hook (minor)
 * 20050919.0 (2.1.8-dev)  mod_ssl ssl_ext_list optional function added
 * 20051005.0 (2.1.8-dev)  NET_TIME filter eliminated
 * 20051005.0 (2.3.0-dev)  Bump MODULE_MAGIC_COOKIE to "AP24"!
 * 20051115.0 (2.3.0-dev)  Added use_canonical_phys_port to core_dir_config
 * 20060110.0 (2.3.0-dev)  Conversion of Authz to be provider based
 *                         addition of <SatisfyAll><SatisfyOne>
 *                         removal of Satisfy, Allow, Deny, Order
 * 20060110.1 (2.3.0-dev)  minex and minex_set members added to
 *                         cache_server_conf (minor)
 * 20060110.2 (2.3.0-dev)  flush_packets and flush_wait members added to
 *                         proxy_server (minor)
 * 20060110.3 (2.3.0-dev)  added inreslist member to proxy_conn_rec (minor)
 * 20060110.4 (2.3.0-dev)  Added server_scheme member to server_rec (minor)
 * 20060905.0 (2.3.0-dev)  Replaced ap_get_server_version() with
 *                         ap_get_server_banner() and ap_get_server_description()
 * 20060905.1 (2.3.0-dev)  Enable retry=0 for the worker (minor)
 * 20060905.2 (2.3.0-dev)  Added ap_all_available_mutexes_string,
 *                         ap_available_mutexes_string and
 *                         ap_parse_mutex()
 * 20060905.3 (2.3.0-dev)  Added conn_rec::clogging_input_filters.
 * 20060905.4 (2.3.0-dev)  Added proxy_balancer::sticky_path.
 * 20060905.5 (2.3.0-dev)  Added ap_mpm_safe_kill()
 * 20070823.0 (2.3.0-dev)  Removed ap_all_available_mutexes_string,
 *                         ap_available_mutexes_string for macros
 * 20070823.1 (2.3.0-dev)  add ap_send_interim_response()
 * 20071023.0 (2.3.0-dev)  add ap_get_scoreboard(sbh) split from the less
 *                         conventional ap_get_scoreboard(proc, thread)
 * 20071023.1 (2.3.0-dev)  Add flags field to struct proxy_alias
 * 20071023.2 (2.3.0-dev)  Add ap_mod_status_reqtail
 * 20071023.3 (2.3.0-dev)  Declare ap_time_process_request() as part of the
 *                         public scoreboard API.
 * 20071108.1 (2.3.0-dev)  Add the optional kept_body brigade to request_rec
 * 20071108.2 (2.3.0-dev)  Add st and keep fields to struct util_ldap_connection_t
 * 20071108.3 (2.3.0-dev)  Add API guarantee for adding connection filters
 *                         with non-NULL request_rec pointer (ap_add_*_filter*)
 * 20071108.4 (2.3.0-dev)  Add ap_proxy_ssl_connection_cleanup
 * 20071108.5 (2.3.0-dev)  Add *scpool to proxy_conn_rec structure
 * 20071108.6 (2.3.0-dev)  Add *r and need_flush to proxy_conn_rec structure
 * 20071108.7 (2.3.0-dev)  Add *ftp_directory_charset to proxy_dir_conf
 * 20071108.8 (2.3.0-dev)  Add optional function ap_logio_add_bytes_in() to mog_logio
 * 20071108.9 (2.3.0-dev)  Add chroot support to unixd_config
 * 20071108.10(2.3.0-dev)  Introduce new ap_expr API
 * 20071108.11(2.3.0-dev)  Revise/Expand new ap_expr API
 * 20071108.12(2.3.0-dev)  Remove ap_expr_clone from the API (same day it was added)
 * 20080403.0 (2.3.0-dev)  Add condition field to core dir config
 * 20080403.1 (2.3.0-dev)  Add authn/z hook and provider registration wrappers.
 * 20080403.2 (2.3.0-dev)  Add ap_escape_path_segment_buffer() and ap_unescape_all().
 * 20080407.0 (2.3.0-dev)  Remove ap_graceful_stop_signalled.
 * 20080407.1              Deprecate ap_cache_cacheable_hdrs_out and add two
 *                         generalized ap_cache_cacheable_headers_(in|out).
 * 20080528.0 (2.3.0-dev)  Switch order of ftp_directory_charset and
 *                         interpolate_env in proxy_dir_conf.
 *                         Rationale: see r661069.
 * 20080528.1 (2.3.0-dev)  add has_realm_hash() to authn_provider struct
 * 20080722.0 (2.3.0-dev)  remove has_realm_hash() from authn_provider struct
 * 20080722.1 (2.3.0-dev)  Add conn_timeout and conn_timeout_set to
 *                         proxy_worker struct.
 * 20080722.2 (2.3.0-dev)  Add scolonsep to proxy_balancer
 * 20080829.0 (2.3.0-dev)  Add cookie attributes when removing cookies
 * 20080830.0 (2.3.0-dev)  Cookies can be set on headers_out and err_headers_out
 * 20080920.0 (2.3.0-dev)  Add ap_mpm_register_timed_callback.
 * 20080920.1 (2.3.0-dev)  Export mod_rewrite.h in the public API.
 * 20080920.2 (2.3.0-dev)  Added ap_timeout_parameter_parse to util.c / httpd.h
 * 20081101.0 (2.3.0-dev)  Remove unused AUTHZ_GROUP_NOTE define.
 * 20081102.0 (2.3.0-dev)  Remove authz_provider_list, authz_request_state,
 *                         and AUTHZ_ACCESS_PASSED_NOTE.
 * 20081104.0 (2.3.0-dev)  Remove r and need_flush fields from proxy_conn_rec
 *                         as they are no longer used and add
 *                         ap_proxy_buckets_lifetime_transform to mod_proxy.h
 * 20081129.0 (2.3.0-dev)  Move AP_FILTER_ERROR and AP_NOBODY_READ|WROTE
 *                         from util_filter.h to httpd.h and change their
 *                         numeric values so they do not overlap with other
 *                         potential status codes
 * 20081201.0 (2.3.0-dev)  Rename several APIs to include ap_ prefix.
 * 20081201.1 (2.3.0-dev)  Added ap_args_to_table and ap_body_to_table.
 * 20081212.0 (2.3.0-dev)  Remove sb_type from process_score in scoreboard.h.
 * 20081231.0 (2.3.0-dev)  Switch ap_escape_html API: add ap_escape_html2,
 *                         and make ap_escape_html a macro for it.
 * 20090130.0 (2.3.2-dev)  Add ap_ prefix to unixd_setup_child().
 * 20090131.0 (2.3.2-dev)  Remove ap_default_type(), disable DefaultType
 * 20090208.0 (2.3.2-dev)  Add conn_rec::current_thread.
 * 20090208.1 (2.3.3-dev)  Add ap_retained_data_create()/ap_retained_data_get()
 * 20090401.0 (2.3.3-dev)  Remove ap_threads_per_child, ap_max_daemons_limit,
 *                         ap_my_generation, etc.  ap_mpm_query() can't be called
 *                         until after the register-hooks phase.
 */

#define MODULE_MAGIC_COOKIE 0x41503234UL /* "AP24" */

#ifndef MODULE_MAGIC_NUMBER_MAJOR
#define MODULE_MAGIC_NUMBER_MAJOR 20090401
#endif
#define MODULE_MAGIC_NUMBER_MINOR 0                     /* 0...n */

/**
 * Determine if the server's current MODULE_MAGIC_NUMBER is at least a
 * specified value.
 * <pre>
 * Useful for testing for features.
 * For example, suppose you wish to use the apr_table_overlap
 *    function.  You can do this:
 *
 * #if AP_MODULE_MAGIC_AT_LEAST(19980812,2)
 *     ... use apr_table_overlap()
 * #else
 *     ... alternative code which doesn't use apr_table_overlap()
 * #endif
 * </pre>
 * @param major The major module magic number
 * @param minor The minor module magic number
 * @fn AP_MODULE_MAGIC_AT_LEAST(int major, int minor)
 */
#define AP_MODULE_MAGIC_AT_LEAST(major,minor)           \
    ((major) < MODULE_MAGIC_NUMBER_MAJOR                \
     || ((major) == MODULE_MAGIC_NUMBER_MAJOR           \
         && (minor) <= MODULE_MAGIC_NUMBER_MINOR))

/** @deprecated present for backwards compatibility */
#define MODULE_MAGIC_NUMBER MODULE_MAGIC_NUMBER_MAJOR
#define MODULE_MAGIC_AT_LEAST old_broken_macro_we_hope_you_are_not_using

#endif /* !APACHE_AP_MMN_H */
/** @} */