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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.
- */
-
-/* The purpose of this file is to store the code that MOST mpm's will need
- * this does not mean a function only goes into this file if every MPM needs
- * it. It means that if a function is needed by more than one MPM, and
- * future maintenance would be served by making the code common, then the
- * function belongs here.
- *
- * This is going in src/main because it is not platform specific, it is
- * specific to multi-process servers, but NOT to Unix. Which is why it
- * does not belong in src/os/unix
- */
-
-#ifndef APACHE_MPM_COMMON_H
-#define APACHE_MPM_COMMON_H
-
-#include "ap_config.h"
-
-#if APR_HAVE_NETINET_TCP_H
-#include <netinet/tcp.h> /* for TCP_NODELAY */
-#endif
-
-#include "mpm.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- * @package Multi-Processing Modules functions
- */
-
-/* The maximum length of the queue of pending connections, as defined
- * by listen(2). Under some systems, it should be increased if you
- * are experiencing a heavy TCP SYN flood attack.
- *
- * It defaults to 511 instead of 512 because some systems store it
- * as an 8-bit datatype; 512 truncated to 8-bits is 0, while 511 is
- * 255 when truncated.
- */
-#ifndef DEFAULT_LISTENBACKLOG
-#define DEFAULT_LISTENBACKLOG 511
-#endif
-
-/**
- * Make sure all child processes that have been spawned by the parent process
- * have died. This includes process registered as "other_children".
- * @warning This is only defined if the MPM defines
- * AP_MPM_WANT_RECLAIM_CHILD_PROCESSES
- * @param terminate Either 1 or 0. If 1, send the child processes SIGTERM
- * each time through the loop. If 0, give the process time to die
- * on its own before signalling it.
- * @tip This function requires that some macros are defined by the MPM: <pre>
- * MPM_CHILD_PID -- Get the pid from the specified spot in the scoreboard
- * MPM_NOTE_CHILD_KILLED -- Note the child died in the scoreboard
- * </pre>
- * @tip The MPM child processes which are reclaimed are those listed
- * in the scoreboard as well as those currently registered via
- * ap_register_extra_mpm_process().
- */
-#ifdef AP_MPM_WANT_RECLAIM_CHILD_PROCESSES
-void ap_reclaim_child_processes(int terminate);
-#endif
-
-/**
- * Tell ap_reclaim_child_processes() about an MPM child process which has no
- * entry in the scoreboard.
- * @warning This is only defined if the MPM defines
- * AP_MPM_WANT_RECLAIM_CHILD_PROCESSES
- * @param pid The process id of an MPM child process which should be
- * reclaimed when ap_reclaim_child_processes() is called.
- * @tip If an extra MPM child process terminates prior to calling
- * ap_reclaim_child_processes(), remove it from the list of such processes
- * by calling ap_unregister_extra_mpm_process().
- */
-#ifdef AP_MPM_WANT_RECLAIM_CHILD_PROCESSES
-void ap_register_extra_mpm_process(pid_t pid);
-#endif
-
-/**
- * Unregister an MPM child process which was previously registered by a
- * call to ap_register_extra_mpm_process().
- * @warning This is only defined if the MPM defines
- * AP_MPM_WANT_RECLAIM_CHILD_PROCESSES
- * @param pid The process id of an MPM child process which no longer needs to
- * be reclaimed.
- * @return 1 if the process was found and removed, 0 otherwise
- */
-#ifdef AP_MPM_WANT_RECLAIM_CHILD_PROCESSES
-int ap_unregister_extra_mpm_process(pid_t pid);
-#endif
-
-/**
- * Determine if any child process has died. If no child process died, then
- * this process sleeps for the amount of time specified by the MPM defined
- * macro SCOREBOARD_MAINTENANCE_INTERVAL.
- * @param status The return code if a process has died
- * @param ret The process id of the process that died
- * @param p The pool to allocate out of
- */
-#ifdef AP_MPM_WANT_WAIT_OR_TIMEOUT
-void ap_wait_or_timeout(apr_exit_why_e *status, int *exitcode, apr_proc_t *ret,
- apr_pool_t *p);
-#endif
-
-/**
- * Log why a child died to the error log, if the child died without the
- * parent signalling it.
- * @param pid The child that has died
- * @param status The status returned from ap_wait_or_timeout
- * @return 0 on success, APEXIT_CHILDFATAL if MPM should terminate
- */
-#ifdef AP_MPM_WANT_PROCESS_CHILD_STATUS
-int ap_process_child_status(apr_proc_t *pid, apr_exit_why_e why, int status);
-#endif
-
-#if defined(TCP_NODELAY) && !defined(MPE) && !defined(TPF)
-/**
- * Turn off the nagle algorithm for the specified socket. The nagle algorithm
- * says that we should delay sending partial packets in the hopes of getting
- * more data. There are bad interactions between persistent connections and
- * Nagle's algorithm that have severe performance penalties.
- * @param s The socket to disable nagle for.
- */
-void ap_sock_disable_nagle(apr_socket_t *s);
-#else
-#define ap_sock_disable_nagle(s) /* NOOP */
-#endif
-
-#ifdef HAVE_GETPWNAM
-/**
- * Convert a username to a numeric ID
- * @param name The name to convert
- * @return The user id corresponding to a name
- * @deffunc uid_t ap_uname2id(const char *name)
- */
-AP_DECLARE(uid_t) ap_uname2id(const char *name);
-#endif
-
-#ifdef HAVE_GETGRNAM
-/**
- * Convert a group name to a numeric ID
- * @param name The name to convert
- * @return The group id corresponding to a name
- * @deffunc gid_t ap_gname2id(const char *name)
- */
-AP_DECLARE(gid_t) ap_gname2id(const char *name);
-#endif
-
-#define AP_MPM_HARD_LIMITS_FILE APACHE_MPM_DIR "/mpm_default.h"
-
-#ifdef AP_MPM_USES_POD
-
-typedef struct ap_pod_t ap_pod_t;
-
-struct ap_pod_t {
- apr_file_t *pod_in;
- apr_file_t *pod_out;
- apr_pool_t *p;
- apr_sockaddr_t *sa;
-};
-
-/**
- * Open the pipe-of-death. The pipe of death is used to tell all child
- * processes that it is time to die gracefully.
- * @param p The pool to use for allocating the pipe
- */
-AP_DECLARE(apr_status_t) ap_mpm_pod_open(apr_pool_t *p, ap_pod_t **pod);
-
-/**
- * Check the pipe to determine if the process has been signalled to die.
- */
-AP_DECLARE(apr_status_t) ap_mpm_pod_check(ap_pod_t *pod);
-
-/**
- * Close the pipe-of-death
- */
-AP_DECLARE(apr_status_t) ap_mpm_pod_close(ap_pod_t *pod);
-
-/**
- * Write data to the pipe-of-death, signalling that one child process
- * should die.
- * @param p The pool to use when allocating any required structures.
- */
-AP_DECLARE(apr_status_t) ap_mpm_pod_signal(ap_pod_t *pod);
-
-/**
- * Write data to the pipe-of-death, signalling that all child process
- * should die.
- * @param p The pool to use when allocating any required structures.
- * @param num The number of child processes to kill
- */
-AP_DECLARE(void) ap_mpm_pod_killpg(ap_pod_t *pod, int num);
-#endif
-
-/*
- * These data members are common to all mpms. Each new mpm
- * should either use the appropriate ap_mpm_set_* function
- * in their command table or create their own for custom or
- * OS specific needs. These should work for most.
- */
-
-/**
- * The maximum number of requests each child thread or
- * process handles before dying off
- */
-#ifdef AP_MPM_WANT_SET_MAX_REQUESTS
-extern int ap_max_requests_per_child;
-const char *ap_mpm_set_max_requests(cmd_parms *cmd, void *dummy,
- const char *arg);
-#endif
-
-/**
- * The filename used to store the process id.
- */
-#ifdef AP_MPM_WANT_SET_PIDFILE
-extern const char *ap_pid_fname;
-const char *ap_mpm_set_pidfile(cmd_parms *cmd, void *dummy,
- const char *arg);
-#endif
-
-/**
- * The name of lockfile used when Apache needs to lock the accept() call.
- */
-#ifdef AP_MPM_WANT_SET_LOCKFILE
-extern const char *ap_lock_fname;
-const char *ap_mpm_set_lockfile(cmd_parms *cmd, void *dummy,
- const char *arg);
-#endif
-
-/**
- * The system mutex implementation to use for the accept mutex.
- */
-#ifdef AP_MPM_WANT_SET_ACCEPT_LOCK_MECH
-extern apr_lockmech_e ap_accept_lock_mech;
-extern const char ap_valid_accept_mutex_string[];
-const char *ap_mpm_set_accept_lock_mech(cmd_parms *cmd, void *dummy,
- const char *arg);
-#endif
-
-/*
- * Set the scorboard file.
- */
-#ifdef AP_MPM_WANT_SET_SCOREBOARD
-const char *ap_mpm_set_scoreboard(cmd_parms *cmd, void *dummy,
- const char *arg);
-#endif
-
-/*
- * The directory that the server changes directory to dump core.
- */
-#ifdef AP_MPM_WANT_SET_COREDUMPDIR
-extern char ap_coredump_dir[MAX_STRING_LEN];
-extern int ap_coredumpdir_configured;
-const char *ap_mpm_set_coredumpdir(cmd_parms *cmd, void *dummy,
- const char *arg);
-#endif
-
-#ifdef AP_MPM_WANT_SIGNAL_SERVER
-int ap_signal_server(int *, apr_pool_t *);
-void ap_mpm_rewrite_args(process_rec *);
-#endif
-
-#ifdef AP_MPM_WANT_SET_MAX_MEM_FREE
-extern apr_uint32_t ap_max_mem_free;
-extern const char *ap_mpm_set_max_mem_free(cmd_parms *cmd, void *dummy,
- const char *arg);
-#endif
-
-#ifdef AP_MPM_WANT_FATAL_SIGNAL_HANDLER
-extern apr_status_t ap_fatal_signal_setup(server_rec *s, apr_pool_t *pconf);
-extern apr_status_t ap_fatal_signal_child_setup(server_rec *s);
-#endif
-
-#if AP_ENABLE_EXCEPTION_HOOK
-extern const char *ap_mpm_set_exception_hook(cmd_parms *cmd, void *dummy,
- const char *arg);
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* !APACHE_MPM_COMMON_H */