prefork.c revision fda1a61aacb6950953b7393b845b0639d8e87359
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele/* Licensed to the Apache Software Foundation (ASF) under one or more
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele * contributor license agreements. See the NOTICE file distributed with
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele * this work for additional information regarding copyright ownership.
5f5d1b4cc970b7f06ff8ef6526128e9a27303d88nd * The ASF licenses this file to You under the Apache License, Version 2.0
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele * (the "License"); you may not use this file except in compliance with
1aa933455fcd538b1ee573f4566e1a78a89fce77nd * the License. You may obtain a copy of the License at
db479b48bd4d75423ed4a45e15b75089d1a8ad72fielding *
db479b48bd4d75423ed4a45e15b75089d1a8ad72fielding * http://www.apache.org/licenses/LICENSE-2.0
db479b48bd4d75423ed4a45e15b75089d1a8ad72fielding *
db479b48bd4d75423ed4a45e15b75089d1a8ad72fielding * Unless required by applicable law or agreed to in writing, software
db479b48bd4d75423ed4a45e15b75089d1a8ad72fielding * distributed under the License is distributed on an "AS IS" BASIS,
db479b48bd4d75423ed4a45e15b75089d1a8ad72fielding * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
1aa933455fcd538b1ee573f4566e1a78a89fce77nd * See the License for the specific language governing permissions and
1aa933455fcd538b1ee573f4566e1a78a89fce77nd * limitations under the License.
1aa933455fcd538b1ee573f4566e1a78a89fce77nd */
1aa933455fcd538b1ee573f4566e1a78a89fce77nd
1aa933455fcd538b1ee573f4566e1a78a89fce77nd#include "apr.h"
1aa933455fcd538b1ee573f4566e1a78a89fce77nd#include "apr_portable.h"
1aa933455fcd538b1ee573f4566e1a78a89fce77nd#include "apr_strings.h"
1aa933455fcd538b1ee573f4566e1a78a89fce77nd#include "apr_thread_proc.h"
1aa933455fcd538b1ee573f4566e1a78a89fce77nd#include "apr_signal.h"
1aa933455fcd538b1ee573f4566e1a78a89fce77nd
7db9f691a00ead175b03335457ca296a33ddf31bnd#define APR_WANT_STDIO
3577f1d38e53397f6b431c02011f875316b2f070nd#define APR_WANT_STRFUNC
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#include "apr_want.h"
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#if APR_HAVE_UNISTD_H
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#include <unistd.h>
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#endif
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#if APR_HAVE_SYS_TYPES_H
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#include <sys/types.h>
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#endif
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#include "ap_config.h"
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#include "httpd.h"
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#include "mpm_default.h"
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#include "http_main.h"
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#include "http_log.h"
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#include "http_config.h"
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#include "http_core.h" /* for get_remote_host */
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#include "http_connection.h"
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#include "scoreboard.h"
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#include "ap_mpm.h"
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#include "unixd.h"
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#include "mpm_common.h"
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#include "ap_listen.h"
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#include "ap_mmn.h"
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#include "apr_poll.h"
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#ifdef HAVE_TIME_H
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#include <time.h>
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#endif
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#ifdef HAVE_SYS_PROCESSOR_H
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive#include <sys/processor.h> /* for bindprocessor() */
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive#endif
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive#include <signal.h>
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive#include <sys/times.h>
06d77ae37da42a6f8bbea25b7d7f8b6629245629slive
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive/* Limit on the total --- clients will be locked out if more servers than
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive * this are needed. It is intended solely to keep the server from crashing
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive * when things get out of hand.
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive *
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive * We keep a hard maximum number of servers, for two reasons --- first off,
c6f41bc69d643835804e7e831776d3d46c6f5962slive * in case something goes seriously wrong, we want to stop the fork bomb
c6f41bc69d643835804e7e831776d3d46c6f5962slive * short of actually crashing the machine we're running on by filling some
c6f41bc69d643835804e7e831776d3d46c6f5962slive * kernel table. Secondly, it keeps the size of the scoreboard file small
c6f41bc69d643835804e7e831776d3d46c6f5962slive * enough that we can read the whole thing without worrying too much about
d7604f90897d9b08b227c127ff5392393178911crpluem * the overhead.
d7604f90897d9b08b227c127ff5392393178911crpluem */
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive#ifndef DEFAULT_SERVER_LIMIT
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive#define DEFAULT_SERVER_LIMIT 256
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive#endif
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive/* Admin can't tune ServerLimit beyond MAX_SERVER_LIMIT. We want
263168fdb45221efa79580de89bdde883b7561f7sf * some sort of compile-time limit to help catch typos.
263168fdb45221efa79580de89bdde883b7561f7sf */
263168fdb45221efa79580de89bdde883b7561f7sf#ifndef MAX_SERVER_LIMIT
263168fdb45221efa79580de89bdde883b7561f7sf#define MAX_SERVER_LIMIT 200000
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive#endif
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive
d7604f90897d9b08b227c127ff5392393178911crpluem#ifndef HARD_THREAD_LIMIT
d7604f90897d9b08b227c127ff5392393178911crpluem#define HARD_THREAD_LIMIT 1
d7604f90897d9b08b227c127ff5392393178911crpluem#endif
d7604f90897d9b08b227c127ff5392393178911crpluem
d7604f90897d9b08b227c127ff5392393178911crpluem/* config globals */
d7604f90897d9b08b227c127ff5392393178911crpluem
d7604f90897d9b08b227c127ff5392393178911crpluemstatic apr_proc_mutex_t *accept_mutex;
d7604f90897d9b08b227c127ff5392393178911crpluemstatic int ap_daemons_to_start=0;
d7604f90897d9b08b227c127ff5392393178911crpluemstatic int ap_daemons_min_free=0;
d7604f90897d9b08b227c127ff5392393178911crpluemstatic int ap_daemons_max_free=0;
d7604f90897d9b08b227c127ff5392393178911crpluemstatic int ap_daemons_limit=0; /* MaxClients */
d7604f90897d9b08b227c127ff5392393178911crpluemstatic int server_limit = 0;
d7604f90897d9b08b227c127ff5392393178911crpluemstatic int mpm_state = AP_MPMQ_STARTING;
c6f41bc69d643835804e7e831776d3d46c6f5962slivestatic ap_pod_t *pod;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun
c6f41bc69d643835804e7e831776d3d46c6f5962slive/* data retained by prefork across load/unload of the module
c6f41bc69d643835804e7e831776d3d46c6f5962slive * allocated on first call to pre-config hook; located on
06d77ae37da42a6f8bbea25b7d7f8b6629245629slive * subsequent calls to pre-config hook
c6f41bc69d643835804e7e831776d3d46c6f5962slive */
c6f41bc69d643835804e7e831776d3d46c6f5962slivetypedef struct prefork_retained_data {
c6f41bc69d643835804e7e831776d3d46c6f5962slive int first_server_limit;
c6f41bc69d643835804e7e831776d3d46c6f5962slive int module_loads;
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive} prefork_retained_data;
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slivestatic prefork_retained_data *retained;
c6f41bc69d643835804e7e831776d3d46c6f5962slive
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive#define MPM_CHILD_PID(i) (ap_scoreboard_image->parent[i].pid)
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive/*
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive * The max child slot ever assigned, preserved across restarts. Necessary
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive * to deal with MaxClients changes across AP_SIG_GRACEFUL restarts. We
3fa816e4832a1c70600bdfd6fc5ef60e9f1c18bbsf * use this value to optimize routines that have to scan the entire scoreboard.
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive */
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slivestatic int max_daemons_limit = -1;
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive/* one_process --- debugging mode variable; can be set from the command line
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive * with the -X flag. If set, this gets you the child_main loop running
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive * in the process which originally started up (no detach, no make_child),
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive * which is a pretty nice debugging environment. (You'll get a SIGHUP
67f57b90aea98fc792b6c6e67bd27ee35f7d026bigalic * early in standalone_main; just continue through. This is the server
d7604f90897d9b08b227c127ff5392393178911crpluem * trying to kill off any child processes which it might have lying
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive * around --- Apache doesn't keep track of their pids, it just sends
67f57b90aea98fc792b6c6e67bd27ee35f7d026bigalic * SIGHUP to the process group, ignoring it in the root process.
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun * Continue through and you'll be fine.).
67f57b90aea98fc792b6c6e67bd27ee35f7d026bigalic */
67f57b90aea98fc792b6c6e67bd27ee35f7d026bigalic
67f57b90aea98fc792b6c6e67bd27ee35f7d026bigalicstatic int one_process = 0;
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slivestatic apr_pool_t *pconf; /* Pool for config stuff */
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slivestatic apr_pool_t *pchild; /* Pool for httpd child stuff */
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slivestatic pid_t ap_my_pid; /* it seems silly to call getpid all the time */
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slivestatic pid_t parent_pid;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#ifndef MULTITHREAD
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slivestatic int my_child_num;
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slive#endif
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slivestatic ap_generation_t volatile my_generation=0;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun
aa8cf57195dfb7fa3d0baedf81f8be377946cea8slivestatic volatile int die_now = 0;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#ifdef GPROF
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele/*
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun * change directory for gprof to plop the gmon.out file
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun * configure in httpd.conf:
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun * GprofDir $RuntimeDir/ -> $ServerRoot/$RuntimeDir/gmon.out
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun * GprofDir $RuntimeDir/% -> $ServerRoot/$RuntimeDir/gprof.$pid/gmon.out
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun */
ad93f15b0bef55041347cdbad447d94296eb89f2nilgunstatic void chdir_for_gprof(void)
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun{
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun core_server_config *sconf =
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun ap_get_module_config(ap_server_conf->module_config, &core_module);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun char *dir = sconf->gprof_dir;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun const char *use_dir;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele if(dir) {
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele apr_status_t res;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele char *buf = NULL ;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele int len = strlen(sconf->gprof_dir) - 1;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele if(*(dir + len) == '%') {
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele dir[len] = '\0';
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele buf = ap_append_pid(pconf, dir, "gprof.");
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun }
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun use_dir = ap_server_root_relative(pconf, buf ? buf : dir);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun res = apr_dir_make(use_dir,
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun APR_UREAD | APR_UWRITE | APR_UEXECUTE |
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun APR_GREAD | APR_GEXECUTE |
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun APR_WREAD | APR_WEXECUTE, pconf);
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele if(res != APR_SUCCESS && !APR_STATUS_IS_EEXIST(res)) {
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele ap_log_error(APLOG_MARK, APLOG_ERR, res, ap_server_conf,
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele "gprof: error creating directory %s", dir);
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele }
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele }
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele else {
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun use_dir = ap_server_root_relative(pconf, DEFAULT_REL_RUNTIMEDIR);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun }
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele chdir(use_dir);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun}
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#else
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#define chdir_for_gprof()
a1ef40892ffa2b44fc249423c5b6c42a74a84c68nd#endif
a1ef40892ffa2b44fc249423c5b6c42a74a84c68nd
a1ef40892ffa2b44fc249423c5b6c42a74a84c68nd/* a clean exit from a child with proper cleanup */
ad93f15b0bef55041347cdbad447d94296eb89f2nilgunstatic void clean_child_exit(int code) __attribute__ ((noreturn));
ad93f15b0bef55041347cdbad447d94296eb89f2nilgunstatic void clean_child_exit(int code)
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun{
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele mpm_state = AP_MPMQ_STOPPING;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele if (pchild) {
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun apr_pool_destroy(pchild);
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele }
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun ap_mpm_pod_close(pod);
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele chdir_for_gprof();
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun exit(code);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun}
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele
ad93f15b0bef55041347cdbad447d94296eb89f2nilgunstatic void accept_mutex_on(void)
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun{
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun apr_status_t rv = apr_proc_mutex_lock(accept_mutex);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun if (rv != APR_SUCCESS) {
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun const char *msg = "couldn't grab the accept mutex";
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun if (my_generation !=
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun ap_scoreboard_image->global->running_generation) {
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, NULL, "%s", msg);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun clean_child_exit(0);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun }
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun else {
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun ap_log_error(APLOG_MARK, APLOG_EMERG, rv, NULL, "%s", msg);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun exit(APEXIT_CHILDFATAL);
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele }
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun }
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun}
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun
10a304fc5348d394375b98ae10ca9b137fd10cafkessstatic void accept_mutex_off(void)
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun{
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun apr_status_t rv = apr_proc_mutex_unlock(accept_mutex);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun if (rv != APR_SUCCESS) {
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun const char *msg = "couldn't release the accept mutex";
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun if (my_generation !=
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun ap_scoreboard_image->global->running_generation) {
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, NULL, "%s", msg);
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele /* don't exit here... we have a connection to
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele * process, after which point we'll see that the
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun * generation changed and we'll exit cleanly
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun */
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun }
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele else {
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun ap_log_error(APLOG_MARK, APLOG_EMERG, rv, NULL, "%s", msg);
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele exit(APEXIT_CHILDFATAL);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun }
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele }
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun}
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun/* On some architectures it's safe to do unserialized accept()s in the single
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun * Listen case. But it's never safe to do it in the case where there's
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun * multiple Listen statements. Define SINGLE_LISTEN_UNSERIALIZED_ACCEPT
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun * when it's safe in the single Listen case.
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun */
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#define SAFE_ACCEPT(stmt) do {if (ap_listeners->next) {stmt;}} while(0)
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#else
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#define SAFE_ACCEPT(stmt) do {stmt;} while(0)
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#endif
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun
4ab980a06412fd86f52a6d054fb7e26de155c530erikabelestatic apr_status_t prefork_query(int query_code, int *result)
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun{
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun switch(query_code){
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun case AP_MPMQ_MAX_DAEMON_USED:
8ba6e8ba8d8ad4d8228872d5526fa7295ff43149poirier *result = ap_daemons_limit;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun return APR_SUCCESS;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele case AP_MPMQ_IS_THREADED:
a3388213b2b4d46b356be205e38204e67b4304d8rbowen *result = AP_MPMQ_NOT_SUPPORTED;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele return APR_SUCCESS;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun case AP_MPMQ_IS_FORKED:
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele *result = AP_MPMQ_DYNAMIC;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun return APR_SUCCESS;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun case AP_MPMQ_HARD_LIMIT_DAEMONS:
5d7e5de2da57434c8e68c8fa49cbf6d70ee0f817slive *result = server_limit;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun return APR_SUCCESS;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele case AP_MPMQ_HARD_LIMIT_THREADS:
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun *result = HARD_THREAD_LIMIT;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele return APR_SUCCESS;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun case AP_MPMQ_MAX_THREADS:
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele *result = 0;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele return APR_SUCCESS;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele case AP_MPMQ_MIN_SPARE_DAEMONS:
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun *result = ap_daemons_min_free;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele return APR_SUCCESS;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun case AP_MPMQ_MIN_SPARE_THREADS:
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele *result = 0;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun return APR_SUCCESS;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele case AP_MPMQ_MAX_SPARE_DAEMONS:
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun *result = ap_daemons_max_free;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun return APR_SUCCESS;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun case AP_MPMQ_MAX_SPARE_THREADS:
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun *result = 0;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun return APR_SUCCESS;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele case AP_MPMQ_MAX_REQUESTS_DAEMON:
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun *result = ap_max_requests_per_child;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun return APR_SUCCESS;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele case AP_MPMQ_MAX_DAEMONS:
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun *result = server_limit;
a3388213b2b4d46b356be205e38204e67b4304d8rbowen return APR_SUCCESS;
a3388213b2b4d46b356be205e38204e67b4304d8rbowen case AP_MPMQ_MPM_STATE:
a3388213b2b4d46b356be205e38204e67b4304d8rbowen *result = mpm_state;
a3388213b2b4d46b356be205e38204e67b4304d8rbowen return APR_SUCCESS;
a3388213b2b4d46b356be205e38204e67b4304d8rbowen case AP_MPMQ_GENERATION:
a3388213b2b4d46b356be205e38204e67b4304d8rbowen *result = my_generation;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun return APR_SUCCESS;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun }
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun return APR_ENOTIMPL;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun}
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun
ad93f15b0bef55041347cdbad447d94296eb89f2nilgunstatic pid_t prefork_get_child_pid(int childnum)
a3388213b2b4d46b356be205e38204e67b4304d8rbowen{
a3388213b2b4d46b356be205e38204e67b4304d8rbowen return ap_scoreboard_image->parent[childnum].pid;
df321386f1d9ed17a3e5e6468807996a12890d50gryzor}
df321386f1d9ed17a3e5e6468807996a12890d50gryzor
df321386f1d9ed17a3e5e6468807996a12890d50gryzorstatic apr_status_t prefork_note_child_killed(int childnum)
df321386f1d9ed17a3e5e6468807996a12890d50gryzor{
df321386f1d9ed17a3e5e6468807996a12890d50gryzor ap_scoreboard_image->parent[childnum].pid = 0;
df321386f1d9ed17a3e5e6468807996a12890d50gryzor return APR_SUCCESS;
df321386f1d9ed17a3e5e6468807996a12890d50gryzor}
df321386f1d9ed17a3e5e6468807996a12890d50gryzor
df321386f1d9ed17a3e5e6468807996a12890d50gryzorstatic const char *prefork_get_name(void)
df321386f1d9ed17a3e5e6468807996a12890d50gryzor{
df321386f1d9ed17a3e5e6468807996a12890d50gryzor return "prefork";
df321386f1d9ed17a3e5e6468807996a12890d50gryzor}
df321386f1d9ed17a3e5e6468807996a12890d50gryzor
df321386f1d9ed17a3e5e6468807996a12890d50gryzor/*****************************************************************
df321386f1d9ed17a3e5e6468807996a12890d50gryzor * Connection structures and accounting...
df321386f1d9ed17a3e5e6468807996a12890d50gryzor */
df321386f1d9ed17a3e5e6468807996a12890d50gryzor
df321386f1d9ed17a3e5e6468807996a12890d50gryzorstatic void just_die(int sig)
df321386f1d9ed17a3e5e6468807996a12890d50gryzor{
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele clean_child_exit(0);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun}
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele
ad93f15b0bef55041347cdbad447d94296eb89f2nilgunstatic void stop_listening(int sig)
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele{
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun ap_close_listeners();
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun /* For a graceful stop, we want the child to exit when done */
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele die_now = 1;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun}
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun/* volatile just in case */
4ab980a06412fd86f52a6d054fb7e26de155c530erikabelestatic int volatile shutdown_pending;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabelestatic int volatile restart_pending;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabelestatic int volatile is_graceful;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele
4ab980a06412fd86f52a6d054fb7e26de155c530erikabelestatic void sig_term(int sig)
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun{
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun if (shutdown_pending == 1) {
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele /* Um, is this _probably_ not an error, if the user has
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun * tried to do a shutdown twice quickly, so we won't
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele * worry about reporting it.
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun */
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele return;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun }
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele shutdown_pending = 1;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun is_graceful = (sig == AP_SIG_GRACEFUL_STOP);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun}
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun/* restart() is the signal handler for SIGHUP and AP_SIG_GRACEFUL
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele * in the parent process, unless running in ONE_PROCESS mode
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun */
4ab980a06412fd86f52a6d054fb7e26de155c530erikabelestatic void restart(int sig)
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun{
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele if (restart_pending == 1) {
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele /* Probably not an error - don't bother reporting it */
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele return;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele }
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun restart_pending = 1;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun is_graceful = (sig == AP_SIG_GRACEFUL);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun}
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele
ad93f15b0bef55041347cdbad447d94296eb89f2nilgunstatic void set_signals(void)
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele{
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#ifndef NO_USE_SIGACTION
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele struct sigaction sa;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#endif
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele if (!one_process) {
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun ap_fatal_signal_setup(ap_server_conf, pconf);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun }
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#ifndef NO_USE_SIGACTION
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun sigemptyset(&sa.sa_mask);
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele sa.sa_flags = 0;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele sa.sa_handler = sig_term;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele if (sigaction(SIGTERM, &sa, NULL) < 0)
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGTERM)");
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#ifdef AP_SIG_GRACEFUL_STOP
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele if (sigaction(AP_SIG_GRACEFUL_STOP, &sa, NULL) < 0)
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf,
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele "sigaction(" AP_SIG_GRACEFUL_STOP_STRING ")");
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#endif
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#ifdef SIGINT
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele if (sigaction(SIGINT, &sa, NULL) < 0)
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGINT)");
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#endif
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#ifdef SIGXCPU
10a304fc5348d394375b98ae10ca9b137fd10cafkess sa.sa_handler = SIG_DFL;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun if (sigaction(SIGXCPU, &sa, NULL) < 0)
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGXCPU)");
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#endif
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#ifdef SIGXFSZ
13dd6a45ad3051c84a03bfbc88f0e314a5322ed6rbowen sa.sa_handler = SIG_DFL;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun if (sigaction(SIGXFSZ, &sa, NULL) < 0)
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGXFSZ)");
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#endif
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#ifdef SIGPIPE
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele sa.sa_handler = SIG_IGN;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele if (sigaction(SIGPIPE, &sa, NULL) < 0)
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGPIPE)");
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#endif
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele /* we want to ignore HUPs and AP_SIG_GRACEFUL while we're busy
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun * processing one
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele */
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun sigaddset(&sa.sa_mask, SIGHUP);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun sigaddset(&sa.sa_mask, AP_SIG_GRACEFUL);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun sa.sa_handler = restart;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun if (sigaction(SIGHUP, &sa, NULL) < 0)
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGHUP)");
2c44e52ec852d7d8392068fd13a1d8d8a4e830c1kess if (sigaction(AP_SIG_GRACEFUL, &sa, NULL) < 0)
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(" AP_SIG_GRACEFUL_STRING ")");
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#else
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun if (!one_process) {
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#ifdef SIGXCPU
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele apr_signal(SIGXCPU, SIG_DFL);
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#endif /* SIGXCPU */
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#ifdef SIGXFSZ
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun apr_signal(SIGXFSZ, SIG_DFL);
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#endif /* SIGXFSZ */
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun }
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele apr_signal(SIGTERM, sig_term);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#ifdef SIGHUP
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele apr_signal(SIGHUP, restart);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#endif /* SIGHUP */
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#ifdef AP_SIG_GRACEFUL
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele apr_signal(AP_SIG_GRACEFUL, restart);
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#endif /* AP_SIG_GRACEFUL */
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#ifdef AP_SIG_GRACEFUL_STOP
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun apr_signal(AP_SIG_GRACEFUL_STOP, sig_term);
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#endif /* AP_SIG_GRACEFUL */
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#ifdef SIGPIPE
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele apr_signal(SIGPIPE, SIG_IGN);
e8811b6d38f756b325446ded5d96857d13856511takashi#endif /* SIGPIPE */
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun#endif
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun}
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele/*****************************************************************
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun * Child process main loop.
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele * The following vars are static to avoid getting clobbered by longjmp();
d4e64150011f0e4a1f1ad316b2723fdde2febe2aigalic * they are really private to child_main.
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele */
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele
0ed10f46135a337e6779d6895d80b43a3471dc70pquernastatic int requests_this_child;
4ab980a06412fd86f52a6d054fb7e26de155c530erikabelestatic int num_listensocks = 0;
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun
4ab980a06412fd86f52a6d054fb7e26de155c530erikabelestatic void child_main(int child_num_arg)
ad93f15b0bef55041347cdbad447d94296eb89f2nilgun{
4ab980a06412fd86f52a6d054fb7e26de155c530erikabele#if APR_HAS_THREADS
apr_thread_t *thd = NULL;
apr_os_thread_t osthd;
#endif
apr_pool_t *ptrans;
apr_allocator_t *allocator;
apr_status_t status;
int i;
ap_listen_rec *lr;
apr_pollset_t *pollset;
ap_sb_handle_t *sbh;
apr_bucket_alloc_t *bucket_alloc;
int last_poll_idx = 0;
mpm_state = AP_MPMQ_STARTING; /* for benefit of any hooks that run as this
* child initializes
*/
my_child_num = child_num_arg;
ap_my_pid = getpid();
requests_this_child = 0;
ap_fatal_signal_child_setup(ap_server_conf);
/* Get a sub context for global allocations in this child, so that
* we can have cleanups occur when the child exits.
*/
apr_allocator_create(&allocator);
apr_allocator_max_free_set(allocator, ap_max_mem_free);
apr_pool_create_ex(&pchild, pconf, NULL, allocator);
apr_allocator_owner_set(allocator, pchild);
apr_pool_tag(pchild, "pchild");
#if APR_HAS_THREADS
osthd = apr_os_thread_current();
apr_os_thread_put(&thd, &osthd, pchild);
#endif
apr_pool_create(&ptrans, pchild);
apr_pool_tag(ptrans, "transaction");
/* needs to be done before we switch UIDs so we have permissions */
ap_reopen_scoreboard(pchild, NULL, 0);
status = apr_proc_mutex_child_init(&accept_mutex, ap_lock_fname, pchild);
if (status != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf,
"Couldn't initialize cross-process lock in child "
"(%s) (%d)", ap_lock_fname, ap_accept_lock_mech);
clean_child_exit(APEXIT_CHILDFATAL);
}
if (ap_run_drop_privileges(pchild, ap_server_conf)) {
clean_child_exit(APEXIT_CHILDFATAL);
}
ap_run_child_init(pchild, ap_server_conf);
ap_create_sb_handle(&sbh, pchild, my_child_num, 0);
(void) ap_update_child_status(sbh, SERVER_READY, (request_rec *) NULL);
/* Set up the pollfd array */
status = apr_pollset_create(&pollset, num_listensocks, pchild, 0);
if (status != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf,
"Couldn't create pollset in child; check system or user limits");
clean_child_exit(APEXIT_CHILDSICK); /* assume temporary resource issue */
}
for (lr = ap_listeners, i = num_listensocks; i--; lr = lr->next) {
apr_pollfd_t pfd = { 0 };
pfd.desc_type = APR_POLL_SOCKET;
pfd.desc.s = lr->sd;
pfd.reqevents = APR_POLLIN;
pfd.client_data = lr;
/* ### check the status */
(void) apr_pollset_add(pollset, &pfd);
lr->accept_func = ap_unixd_accept;
}
mpm_state = AP_MPMQ_RUNNING;
bucket_alloc = apr_bucket_alloc_create(pchild);
/* die_now is set when AP_SIG_GRACEFUL is received in the child;
* shutdown_pending is set when SIGTERM is received when running
* in single process mode. */
while (!die_now && !shutdown_pending) {
conn_rec *current_conn;
void *csd;
/*
* (Re)initialize this child to a pre-connection state.
*/
apr_pool_clear(ptrans);
if ((ap_max_requests_per_child > 0
&& requests_this_child++ >= ap_max_requests_per_child)) {
clean_child_exit(0);
}
(void) ap_update_child_status(sbh, SERVER_READY, (request_rec *) NULL);
/*
* Wait for an acceptable connection to arrive.
*/
/* Lock around "accept", if necessary */
SAFE_ACCEPT(accept_mutex_on());
if (num_listensocks == 1) {
/* There is only one listener record, so refer to that one. */
lr = ap_listeners;
}
else {
/* multiple listening sockets - need to poll */
for (;;) {
apr_int32_t numdesc;
const apr_pollfd_t *pdesc;
/* check for termination first so we don't sleep for a while in
* poll if already signalled
*/
if (one_process && shutdown_pending) {
SAFE_ACCEPT(accept_mutex_off());
return;
}
else if (die_now) {
/* In graceful stop/restart; drop the mutex
* and terminate the child. */
SAFE_ACCEPT(accept_mutex_off());
clean_child_exit(0);
}
/* timeout == 10 seconds to avoid a hang at graceful restart/stop
* caused by the closing of sockets by the signal handler
*/
status = apr_pollset_poll(pollset, apr_time_from_sec(10),
&numdesc, &pdesc);
if (status != APR_SUCCESS) {
if (APR_STATUS_IS_TIMEUP(status) ||
APR_STATUS_IS_EINTR(status)) {
continue;
}
/* Single Unix documents select as returning errnos
* EBADF, EINTR, and EINVAL... and in none of those
* cases does it make sense to continue. In fact
* on Linux 2.0.x we seem to end up with EFAULT
* occasionally, and we'd loop forever due to it.
*/
ap_log_error(APLOG_MARK, APLOG_ERR, status,
ap_server_conf, "apr_pollset_poll: (listen)");
SAFE_ACCEPT(accept_mutex_off());
clean_child_exit(1);
}
/* We can always use pdesc[0], but sockets at position N
* could end up completely starved of attention in a very
* busy server. Therefore, we round-robin across the
* returned set of descriptors. While it is possible that
* the returned set of descriptors might flip around and
* continue to starve some sockets, we happen to know the
* internal pollset implementation retains ordering
* stability of the sockets. Thus, the round-robin should
* ensure that a socket will eventually be serviced.
*/
if (last_poll_idx >= numdesc)
last_poll_idx = 0;
/* Grab a listener record from the client_data of the poll
* descriptor, and advance our saved index to round-robin
* the next fetch.
*
* ### hmm... this descriptor might have POLLERR rather
* ### than POLLIN
*/
lr = pdesc[last_poll_idx++].client_data;
goto got_fd;
}
}
got_fd:
/* if we accept() something we don't want to die, so we have to
* defer the exit
*/
status = lr->accept_func(&csd, lr, ptrans);
SAFE_ACCEPT(accept_mutex_off()); /* unlock after "accept" */
if (status == APR_EGENERAL) {
/* resource shortage or should-not-occur occured */
clean_child_exit(1);
}
else if (status != APR_SUCCESS) {
continue;
}
/*
* We now have a connection, so set it up with the appropriate
* socket options, file descriptors, and read/write buffers.
*/
current_conn = ap_run_create_connection(ptrans, ap_server_conf, csd, my_child_num, sbh, bucket_alloc);
if (current_conn) {
#if APR_HAS_THREADS
current_conn->current_thread = thd;
#endif
ap_process_connection(current_conn, csd);
ap_lingering_close(current_conn);
}
/* Check the pod and the generation number after processing a
* connection so that we'll go away if a graceful restart occurred
* while we were processing the connection or we are the lucky
* idle server process that gets to die.
*/
if (ap_mpm_pod_check(pod) == APR_SUCCESS) { /* selected as idle? */
die_now = 1;
}
else if (my_generation !=
ap_scoreboard_image->global->running_generation) { /* restart? */
/* yeah, this could be non-graceful restart, in which case the
* parent will kill us soon enough, but why bother checking?
*/
die_now = 1;
}
}
clean_child_exit(0);
}
static int make_child(server_rec *s, int slot)
{
int pid;
if (slot + 1 > max_daemons_limit) {
max_daemons_limit = slot + 1;
}
if (one_process) {
apr_signal(SIGHUP, sig_term);
/* Don't catch AP_SIG_GRACEFUL in ONE_PROCESS mode :) */
apr_signal(SIGINT, sig_term);
#ifdef SIGQUIT
apr_signal(SIGQUIT, SIG_DFL);
#endif
apr_signal(SIGTERM, sig_term);
child_main(slot);
return 0;
}
(void) ap_update_child_status_from_indexes(slot, 0, SERVER_STARTING,
(request_rec *) NULL);
#ifdef _OSD_POSIX
/* BS2000 requires a "special" version of fork() before a setuid() call */
if ((pid = os_fork(ap_unixd_config.user_name)) == -1) {
#else
if ((pid = fork()) == -1) {
#endif
ap_log_error(APLOG_MARK, APLOG_ERR, errno, s, "fork: Unable to fork new process");
/* fork didn't succeed. Fix the scoreboard or else
* it will say SERVER_STARTING forever and ever
*/
(void) ap_update_child_status_from_indexes(slot, 0, SERVER_DEAD,
(request_rec *) NULL);
/* In case system resources are maxxed out, we don't want
* Apache running away with the CPU trying to fork over and
* over and over again.
*/
sleep(10);
return -1;
}
if (!pid) {
#ifdef HAVE_BINDPROCESSOR
/* by default AIX binds to a single processor
* this bit unbinds children which will then bind to another cpu
*/
int status = bindprocessor(BINDPROCESS, (int)getpid(),
PROCESSOR_CLASS_ANY);
if (status != OK) {
ap_log_error(APLOG_MARK, APLOG_WARNING, errno,
ap_server_conf, "processor unbind failed %d", status);
}
#endif
RAISE_SIGSTOP(MAKE_CHILD);
AP_MONCONTROL(1);
/* Disable the parent's signal handlers and set up proper handling in
* the child.
*/
apr_signal(SIGHUP, just_die);
apr_signal(SIGTERM, just_die);
/* The child process just closes listeners on AP_SIG_GRACEFUL.
* The pod is used for signalling the graceful restart.
*/
apr_signal(AP_SIG_GRACEFUL, stop_listening);
child_main(slot);
}
ap_scoreboard_image->parent[slot].pid = pid;
return 0;
}
/* start up a bunch of children */
static void startup_children(int number_to_start)
{
int i;
for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
if (ap_scoreboard_image->servers[i][0].status != SERVER_DEAD) {
continue;
}
if (make_child(ap_server_conf, i) < 0) {
break;
}
--number_to_start;
}
}
/*
* idle_spawn_rate is the number of children that will be spawned on the
* next maintenance cycle if there aren't enough idle servers. It is
* doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
* without the need to spawn.
*/
static int idle_spawn_rate = 1;
#ifndef MAX_SPAWN_RATE
#define MAX_SPAWN_RATE (32)
#endif
static int hold_off_on_exponential_spawning;
static void perform_idle_server_maintenance(apr_pool_t *p)
{
int i;
int to_kill;
int idle_count;
worker_score *ws;
int free_length;
int free_slots[MAX_SPAWN_RATE];
int last_non_dead;
int total_non_dead;
/* initialize the free_list */
free_length = 0;
to_kill = -1;
idle_count = 0;
last_non_dead = -1;
total_non_dead = 0;
for (i = 0; i < ap_daemons_limit; ++i) {
int status;
if (i >= max_daemons_limit && free_length == idle_spawn_rate)
break;
ws = &ap_scoreboard_image->servers[i][0];
status = ws->status;
if (status == SERVER_DEAD) {
/* try to keep children numbers as low as possible */
if (free_length < idle_spawn_rate) {
free_slots[free_length] = i;
++free_length;
}
}
else {
/* We consider a starting server as idle because we started it
* at least a cycle ago, and if it still hasn't finished starting
* then we're just going to swamp things worse by forking more.
* So we hopefully won't need to fork more if we count it.
* This depends on the ordering of SERVER_READY and SERVER_STARTING.
*/
if (status <= SERVER_READY) {
++ idle_count;
/* always kill the highest numbered child if we have to...
* no really well thought out reason ... other than observing
* the server behaviour under linux where lower numbered children
* tend to service more hits (and hence are more likely to have
* their data in cpu caches).
*/
to_kill = i;
}
++total_non_dead;
last_non_dead = i;
}
}
max_daemons_limit = last_non_dead + 1;
if (idle_count > ap_daemons_max_free) {
/* kill off one child... we use the pod because that'll cause it to
* shut down gracefully, in case it happened to pick up a request
* while we were counting
*/
ap_mpm_pod_signal(pod);
idle_spawn_rate = 1;
}
else if (idle_count < ap_daemons_min_free) {
/* terminate the free list */
if (free_length == 0) {
/* only report this condition once */
static int reported = 0;
if (!reported) {
ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf,
"server reached MaxClients setting, consider"
" raising the MaxClients setting");
reported = 1;
}
idle_spawn_rate = 1;
}
else {
if (idle_spawn_rate >= 8) {
ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf,
"server seems busy, (you may need "
"to increase StartServers, or Min/MaxSpareServers), "
"spawning %d children, there are %d idle, and "
"%d total children", idle_spawn_rate,
idle_count, total_non_dead);
}
for (i = 0; i < free_length; ++i) {
make_child(ap_server_conf, free_slots[i]);
}
/* the next time around we want to spawn twice as many if this
* wasn't good enough, but not if we've just done a graceful
*/
if (hold_off_on_exponential_spawning) {
--hold_off_on_exponential_spawning;
}
else if (idle_spawn_rate < MAX_SPAWN_RATE) {
idle_spawn_rate *= 2;
}
}
}
else {
idle_spawn_rate = 1;
}
}
/*****************************************************************
* Executive routines.
*/
static int prefork_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s)
{
int index;
int remaining_children_to_start;
apr_status_t rv;
ap_log_pid(pconf, ap_pid_fname);
/* Initialize cross-process accept lock */
ap_lock_fname = apr_psprintf(_pconf, "%s.%" APR_PID_T_FMT,
ap_server_root_relative(_pconf, ap_lock_fname),
ap_my_pid);
rv = apr_proc_mutex_create(&accept_mutex, ap_lock_fname,
ap_accept_lock_mech, _pconf);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
"Couldn't create accept lock (%s) (%d)",
ap_lock_fname, ap_accept_lock_mech);
mpm_state = AP_MPMQ_STOPPING;
return 1;
}
#if APR_USE_SYSVSEM_SERIALIZE
if (ap_accept_lock_mech == APR_LOCK_DEFAULT ||
ap_accept_lock_mech == APR_LOCK_SYSVSEM) {
#else
if (ap_accept_lock_mech == APR_LOCK_SYSVSEM) {
#endif
rv = ap_unixd_set_proc_mutex_perms(accept_mutex);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
"Couldn't set permissions on cross-process lock; "
"check User and Group directives");
mpm_state = AP_MPMQ_STOPPING;
return 1;
}
}
if (!is_graceful) {
if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
mpm_state = AP_MPMQ_STOPPING;
return 1;
}
/* fix the generation number in the global score; we just got a new,
* cleared scoreboard
*/
ap_scoreboard_image->global->running_generation = my_generation;
}
set_signals();
if (one_process) {
AP_MONCONTROL(1);
make_child(ap_server_conf, 0);
}
else {
if (ap_daemons_max_free < ap_daemons_min_free + 1) /* Don't thrash... */
ap_daemons_max_free = ap_daemons_min_free + 1;
/* If we're doing a graceful_restart then we're going to see a lot
* of children exiting immediately when we get into the main loop
* below (because we just sent them AP_SIG_GRACEFUL). This happens pretty
* rapidly... and for each one that exits we'll start a new one until
* we reach at least daemons_min_free. But we may be permitted to
* start more than that, so we'll just keep track of how many we're
* supposed to start up without the 1 second penalty between each fork.
*/
remaining_children_to_start = ap_daemons_to_start;
if (remaining_children_to_start > ap_daemons_limit) {
remaining_children_to_start = ap_daemons_limit;
}
if (!is_graceful) {
startup_children(remaining_children_to_start);
remaining_children_to_start = 0;
}
else {
/* give the system some time to recover before kicking into
* exponential mode
*/
hold_off_on_exponential_spawning = 10;
}
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
"%s configured -- resuming normal operations",
ap_get_server_description());
ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf,
"Server built: %s", ap_get_server_built());
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
"AcceptMutex: %s (default: %s)",
apr_proc_mutex_name(accept_mutex),
apr_proc_mutex_defname());
restart_pending = shutdown_pending = 0;
mpm_state = AP_MPMQ_RUNNING;
while (!restart_pending && !shutdown_pending) {
int child_slot;
apr_exit_why_e exitwhy;
int status, processed_status;
/* this is a memory leak, but I'll fix it later. */
apr_proc_t pid;
ap_wait_or_timeout(&exitwhy, &status, &pid, pconf);
/* XXX: if it takes longer than 1 second for all our children
* to start up and get into IDLE state then we may spawn an
* extra child
*/
if (pid.pid != -1) {
processed_status = ap_process_child_status(&pid, exitwhy, status);
if (processed_status == APEXIT_CHILDFATAL) {
mpm_state = AP_MPMQ_STOPPING;
return 1;
}
/* non-fatal death... note that it's gone in the scoreboard. */
child_slot = ap_find_child_by_pid(&pid);
if (child_slot >= 0) {
(void) ap_update_child_status_from_indexes(child_slot, 0, SERVER_DEAD,
(request_rec *) NULL);
if (processed_status == APEXIT_CHILDSICK) {
/* child detected a resource shortage (E[NM]FILE, ENOBUFS, etc)
* cut the fork rate to the minimum
*/
idle_spawn_rate = 1;
}
else if (remaining_children_to_start
&& child_slot < ap_daemons_limit) {
/* we're still doing a 1-for-1 replacement of dead
* children with new children
*/
make_child(ap_server_conf, child_slot);
--remaining_children_to_start;
}
#if APR_HAS_OTHER_CHILD
}
else if (apr_proc_other_child_alert(&pid, APR_OC_REASON_DEATH, status) == APR_SUCCESS) {
/* handled */
#endif
}
else if (is_graceful) {
/* Great, we've probably just lost a slot in the
* scoreboard. Somehow we don't know about this
* child.
*/
ap_log_error(APLOG_MARK, APLOG_WARNING,
0, ap_server_conf,
"long lost child came home! (pid %ld)", (long)pid.pid);
}
/* Don't perform idle maintenance when a child dies,
* only do it when there's a timeout. Remember only a
* finite number of children can die, and it's pretty
* pathological for a lot to die suddenly.
*/
continue;
}
else if (remaining_children_to_start) {
/* we hit a 1 second timeout in which none of the previous
* generation of children needed to be reaped... so assume
* they're all done, and pick up the slack if any is left.
*/
startup_children(remaining_children_to_start);
remaining_children_to_start = 0;
/* In any event we really shouldn't do the code below because
* few of the servers we just started are in the IDLE state
* yet, so we'd mistakenly create an extra server.
*/
continue;
}
perform_idle_server_maintenance(pconf);
}
} /* one_process */
mpm_state = AP_MPMQ_STOPPING;
if (shutdown_pending && !is_graceful) {
/* Time to shut down:
* Kill child processes, tell them to call child_exit, etc...
*/
if (ap_unixd_killpg(getpgrp(), SIGTERM) < 0) {
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "killpg SIGTERM");
}
ap_reclaim_child_processes(1); /* Start with SIGTERM */
/* cleanup pid file on normal shutdown */
{
const char *pidfile = NULL;
pidfile = ap_server_root_relative (pconf, ap_pid_fname);
if ( pidfile != NULL && unlink(pidfile) == 0)
ap_log_error(APLOG_MARK, APLOG_INFO,
0, ap_server_conf,
"removed PID file %s (pid=%ld)",
pidfile, (long)getpid());
}
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
"caught SIGTERM, shutting down");
return 1;
} else if (shutdown_pending) {
/* Time to perform a graceful shut down:
* Reap the inactive children, and ask the active ones
* to close their listeners, then wait until they are
* all done to exit.
*/
int active_children;
apr_time_t cutoff = 0;
/* Stop listening */
ap_close_listeners();
/* kill off the idle ones */
ap_mpm_pod_killpg(pod, max_daemons_limit);
/* Send SIGUSR1 to the active children */
active_children = 0;
for (index = 0; index < ap_daemons_limit; ++index) {
if (ap_scoreboard_image->servers[index][0].status != SERVER_DEAD) {
/* Ask each child to close its listeners. */
ap_mpm_safe_kill(MPM_CHILD_PID(index), AP_SIG_GRACEFUL);
active_children++;
}
}
/* Allow each child which actually finished to exit */
ap_relieve_child_processes();
/* cleanup pid file */
{
const char *pidfile = NULL;
pidfile = ap_server_root_relative (pconf, ap_pid_fname);
if ( pidfile != NULL && unlink(pidfile) == 0)
ap_log_error(APLOG_MARK, APLOG_INFO,
0, ap_server_conf,
"removed PID file %s (pid=%ld)",
pidfile, (long)getpid());
}
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
"caught " AP_SIG_GRACEFUL_STOP_STRING ", shutting down gracefully");
if (ap_graceful_shutdown_timeout) {
cutoff = apr_time_now() +
apr_time_from_sec(ap_graceful_shutdown_timeout);
}
/* Don't really exit until each child has finished */
shutdown_pending = 0;
do {
/* Pause for a second */
sleep(1);
/* Relieve any children which have now exited */
ap_relieve_child_processes();
active_children = 0;
for (index = 0; index < ap_daemons_limit; ++index) {
if (ap_mpm_safe_kill(MPM_CHILD_PID(index), 0) == APR_SUCCESS) {
active_children = 1;
/* Having just one child is enough to stay around */
break;
}
}
} while (!shutdown_pending && active_children &&
(!ap_graceful_shutdown_timeout || apr_time_now() < cutoff));
/* We might be here because we received SIGTERM, either
* way, try and make sure that all of our processes are
* really dead.
*/
ap_unixd_killpg(getpgrp(), SIGTERM);
return 1;
}
/* we've been told to restart */
apr_signal(SIGHUP, SIG_IGN);
apr_signal(AP_SIG_GRACEFUL, SIG_IGN);
if (one_process) {
/* not worth thinking about */
return 1;
}
/* advance to the next generation */
/* XXX: we really need to make sure this new generation number isn't in
* use by any of the children.
*/
++my_generation;
ap_scoreboard_image->global->running_generation = my_generation;
if (is_graceful) {
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
"Graceful restart requested, doing restart");
/* kill off the idle ones */
ap_mpm_pod_killpg(pod, max_daemons_limit);
/* This is mostly for debugging... so that we know what is still
* gracefully dealing with existing request. This will break
* in a very nasty way if we ever have the scoreboard totally
* file-based (no shared memory)
*/
for (index = 0; index < ap_daemons_limit; ++index) {
if (ap_scoreboard_image->servers[index][0].status != SERVER_DEAD) {
ap_scoreboard_image->servers[index][0].status = SERVER_GRACEFUL;
/* Ask each child to close its listeners.
*
* NOTE: we use the scoreboard, because if we send SIGUSR1
* to every process in the group, this may include CGI's,
* piped loggers, etc. They almost certainly won't handle
* it gracefully.
*/
ap_mpm_safe_kill(ap_scoreboard_image->parent[index].pid, AP_SIG_GRACEFUL);
}
}
}
else {
/* Kill 'em off */
if (ap_unixd_killpg(getpgrp(), SIGHUP) < 0) {
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "killpg SIGHUP");
}
ap_reclaim_child_processes(0); /* Not when just starting up */
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
"SIGHUP received. Attempting to restart");
}
return 0;
}
/* This really should be a post_config hook, but the error log is already
* redirected by that point, so we need to do this in the open_logs phase.
*/
static int prefork_open_logs(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s)
{
int startup = 0;
int level_flags = 0;
apr_status_t rv;
pconf = p;
/* the reverse of pre_config, we want this only the first time around */
if (retained->module_loads == 1) {
startup = 1;
level_flags |= APLOG_STARTUP;
}
if ((num_listensocks = ap_setup_listeners(ap_server_conf)) < 1) {
ap_log_error(APLOG_MARK, APLOG_ALERT | level_flags, 0,
(startup ? NULL : s),
"no listening sockets available, shutting down");
return DONE;
}
if ((rv = ap_mpm_pod_open(pconf, &pod))) {
ap_log_error(APLOG_MARK, APLOG_CRIT | level_flags, rv,
(startup ? NULL : s),
"could not open pipe-of-death");
return DONE;
}
return OK;
}
static int prefork_pre_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp)
{
int no_detach, debug, foreground;
apr_status_t rv;
const char *userdata_key = "mpm_prefork_module";
mpm_state = AP_MPMQ_STARTING;
debug = ap_exists_config_define("DEBUG");
if (debug) {
foreground = one_process = 1;
no_detach = 0;
}
else
{
no_detach = ap_exists_config_define("NO_DETACH");
one_process = ap_exists_config_define("ONE_PROCESS");
foreground = ap_exists_config_define("FOREGROUND");
}
/* sigh, want this only the second time around */
retained = ap_get_retained_data(userdata_key);
if (!retained) {
retained = ap_set_retained_data(userdata_key, sizeof(*retained));
}
++retained->module_loads;
if (retained->module_loads == 2) {
is_graceful = 0;
if (!one_process && !foreground) {
rv = apr_proc_detach(no_detach ? APR_PROC_DETACH_FOREGROUND
: APR_PROC_DETACH_DAEMONIZE);
if (rv != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL,
"apr_proc_detach failed");
return HTTP_INTERNAL_SERVER_ERROR;
}
}
parent_pid = ap_my_pid = getpid();
}
ap_listen_pre_config();
ap_daemons_to_start = DEFAULT_START_DAEMON;
ap_daemons_min_free = DEFAULT_MIN_FREE_DAEMON;
ap_daemons_max_free = DEFAULT_MAX_FREE_DAEMON;
server_limit = DEFAULT_SERVER_LIMIT;
ap_daemons_limit = server_limit;
ap_pid_fname = DEFAULT_PIDLOG;
ap_lock_fname = DEFAULT_LOCKFILE;
ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
ap_extended_status = 0;
ap_max_mem_free = APR_ALLOCATOR_MAX_FREE_UNLIMITED;
apr_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
return OK;
}
static int prefork_check_config(apr_pool_t *p, apr_pool_t *plog,
apr_pool_t *ptemp, server_rec *s)
{
int startup = 0;
/* the reverse of pre_config, we want this only the first time around */
if (retained->module_loads == 1) {
startup = 1;
}
if (server_limit > MAX_SERVER_LIMIT) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
"WARNING: ServerLimit of %d exceeds compile-time "
"limit of", server_limit);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" %d servers, decreasing to %d.",
MAX_SERVER_LIMIT, MAX_SERVER_LIMIT);
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
"ServerLimit of %d exceeds compile-time limit "
"of %d, decreasing to match",
server_limit, MAX_SERVER_LIMIT);
}
server_limit = MAX_SERVER_LIMIT;
}
else if (server_limit < 1) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
"WARNING: ServerLimit of %d not allowed, "
"increasing to 1.", server_limit);
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
"ServerLimit of %d not allowed, increasing to 1",
server_limit);
}
server_limit = 1;
}
/* you cannot change ServerLimit across a restart; ignore
* any such attempts
*/
if (!retained->first_server_limit) {
retained->first_server_limit = server_limit;
}
else if (server_limit != retained->first_server_limit) {
/* don't need a startup console version here */
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
"changing ServerLimit to %d from original value of %d "
"not allowed during restart",
server_limit, retained->first_server_limit);
server_limit = retained->first_server_limit;
}
if (ap_daemons_limit > server_limit) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
"WARNING: MaxClients of %d exceeds ServerLimit "
"value of", ap_daemons_limit);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" %d servers, decreasing MaxClients to %d.",
server_limit, server_limit);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" To increase, please see the ServerLimit "
"directive.");
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
"MaxClients of %d exceeds ServerLimit value "
"of %d, decreasing to match",
ap_daemons_limit, server_limit);
}
ap_daemons_limit = server_limit;
}
else if (ap_daemons_limit < 1) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
"WARNING: MaxClients of %d not allowed, "
"increasing to 1.", ap_daemons_limit);
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
"MaxClients of %d not allowed, increasing to 1",
ap_daemons_limit);
}
ap_daemons_limit = 1;
}
/* ap_daemons_to_start > ap_daemons_limit checked in prefork_run() */
if (ap_daemons_to_start < 0) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
"WARNING: StartServers of %d not allowed, "
"increasing to 1.", ap_daemons_to_start);
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
"StartServers of %d not allowed, increasing to 1",
ap_daemons_to_start);
}
ap_daemons_to_start = 1;
}
if (ap_daemons_min_free < 1) {
if (startup) {
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
"WARNING: MinSpareServers of %d not allowed, "
"increasing to 1", ap_daemons_min_free);
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" to avoid almost certain server failure.");
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
" Please read the documentation.");
} else {
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
"MinSpareServers of %d not allowed, increasing to 1",
ap_daemons_min_free);
}
ap_daemons_min_free = 1;
}
/* ap_daemons_max_free < ap_daemons_min_free + 1 checked in prefork_run() */
return OK;
}
static void prefork_hooks(apr_pool_t *p)
{
/* Our open_logs hook function must run before the core's, or stderr
* will be redirected to a file, and the messages won't print to the
* console.
*/
static const char *const aszSucc[] = {"core.c", NULL};
ap_hook_open_logs(prefork_open_logs, NULL, aszSucc, APR_HOOK_REALLY_FIRST);
/* we need to set the MPM state before other pre-config hooks use MPM query
* to retrieve it, so register as REALLY_FIRST
*/
ap_hook_pre_config(prefork_pre_config, NULL, NULL, APR_HOOK_REALLY_FIRST);
ap_hook_check_config(prefork_check_config, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_mpm(prefork_run, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_mpm_query(prefork_query, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_mpm_get_child_pid(prefork_get_child_pid, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_mpm_note_child_killed(prefork_note_child_killed, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_mpm_get_name(prefork_get_name, NULL, NULL, APR_HOOK_MIDDLE);
}
static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy, const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_daemons_to_start = atoi(arg);
return NULL;
}
static const char *set_min_free_servers(cmd_parms *cmd, void *dummy, const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_daemons_min_free = atoi(arg);
return NULL;
}
static const char *set_max_free_servers(cmd_parms *cmd, void *dummy, const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_daemons_max_free = atoi(arg);
return NULL;
}
static const char *set_max_clients (cmd_parms *cmd, void *dummy, const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_daemons_limit = atoi(arg);
return NULL;
}
static const char *set_server_limit (cmd_parms *cmd, void *dummy, const char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
server_limit = atoi(arg);
return NULL;
}
static const command_rec prefork_cmds[] = {
LISTEN_COMMANDS,
AP_INIT_TAKE1("StartServers", set_daemons_to_start, NULL, RSRC_CONF,
"Number of child processes launched at server startup"),
AP_INIT_TAKE1("MinSpareServers", set_min_free_servers, NULL, RSRC_CONF,
"Minimum number of idle children, to handle request spikes"),
AP_INIT_TAKE1("MaxSpareServers", set_max_free_servers, NULL, RSRC_CONF,
"Maximum number of idle children"),
AP_INIT_TAKE1("MaxClients", set_max_clients, NULL, RSRC_CONF,
"Maximum number of children alive at the same time"),
AP_INIT_TAKE1("ServerLimit", set_server_limit, NULL, RSRC_CONF,
"Maximum value of MaxClients for this run of Apache"),
AP_GRACEFUL_SHUTDOWN_TIMEOUT_COMMAND,
{ NULL }
};
module AP_MODULE_DECLARE_DATA mpm_prefork_module = {
MPM20_MODULE_STUFF,
NULL, /* hook to run before apache parses args */
NULL, /* create per-directory config structure */
NULL, /* merge per-directory config structures */
NULL, /* create per-server config structure */
NULL, /* merge per-server config structures */
prefork_cmds, /* command apr_table_t */
prefork_hooks, /* register hooks */
};