1564 lines
56 KiB
C
1564 lines
56 KiB
C
/* 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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#include "apr.h"
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#include "apr_portable.h"
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#include "apr_strings.h"
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#include "apr_thread_proc.h"
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#include "apr_signal.h"
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#define APR_WANT_STDIO
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#define APR_WANT_STRFUNC
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#include "apr_want.h"
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#if APR_HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if APR_HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#include "ap_config.h"
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#include "httpd.h"
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#include "mpm_default.h"
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#include "http_main.h"
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#include "http_log.h"
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#include "http_config.h"
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#include "http_core.h" /* for get_remote_host */
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#include "http_connection.h"
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#include "scoreboard.h"
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#include "ap_mpm.h"
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#include "util_mutex.h"
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#include "unixd.h"
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#include "mpm_common.h"
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#include "ap_listen.h"
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#include "ap_mmn.h"
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#include "apr_poll.h"
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#include <stdlib.h>
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#ifdef HAVE_TIME_H
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#include <time.h>
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#endif
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#ifdef HAVE_SYS_PROCESSOR_H
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#include <sys/processor.h> /* for bindprocessor() */
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#endif
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#include <signal.h>
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#include <sys/times.h>
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/* Limit on the total --- clients will be locked out if more servers than
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* this are needed. It is intended solely to keep the server from crashing
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* when things get out of hand.
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*
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* We keep a hard maximum number of servers, for two reasons --- first off,
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* in case something goes seriously wrong, we want to stop the fork bomb
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* short of actually crashing the machine we're running on by filling some
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* kernel table. Secondly, it keeps the size of the scoreboard file small
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* enough that we can read the whole thing without worrying too much about
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* the overhead.
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*/
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#ifndef DEFAULT_SERVER_LIMIT
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#define DEFAULT_SERVER_LIMIT 256
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#endif
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/* Admin can't tune ServerLimit beyond MAX_SERVER_LIMIT. We want
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* some sort of compile-time limit to help catch typos.
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*/
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#ifndef MAX_SERVER_LIMIT
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#define MAX_SERVER_LIMIT 200000
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#endif
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#ifndef HARD_THREAD_LIMIT
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#define HARD_THREAD_LIMIT 1
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#endif
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/* config globals */
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static int ap_daemons_to_start=0;
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static int ap_daemons_min_free=0;
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static int ap_daemons_max_free=0;
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static int ap_daemons_limit=0; /* MaxRequestWorkers */
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static int server_limit = 0;
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/* data retained by prefork across load/unload of the module
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* allocated on first call to pre-config hook; located on
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* subsequent calls to pre-config hook
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*/
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typedef struct prefork_retained_data {
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ap_unixd_mpm_retained_data *mpm;
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int first_server_limit;
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int maxclients_reported;
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/*
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* The max child slot ever assigned, preserved across restarts. Necessary
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* to deal with MaxRequestWorkers changes across AP_SIG_GRACEFUL restarts. We
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* use this value to optimize routines that have to scan the entire scoreboard.
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*/
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int max_daemons_limit;
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/*
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* idle_spawn_rate is the number of children that will be spawned on the
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* next maintenance cycle if there aren't enough idle servers. It is
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* doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
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* without the need to spawn.
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*/
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int idle_spawn_rate;
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#ifndef MAX_SPAWN_RATE
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#define MAX_SPAWN_RATE (32)
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#endif
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int hold_off_on_exponential_spawning;
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} prefork_retained_data;
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static prefork_retained_data *retained;
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typedef struct prefork_child_bucket {
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ap_pod_t *pod;
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ap_listen_rec *listeners;
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apr_proc_mutex_t *mutex;
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} prefork_child_bucket;
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static prefork_child_bucket *all_buckets, /* All listeners buckets */
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*my_bucket; /* Current child bucket */
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#define MPM_CHILD_PID(i) (ap_scoreboard_image->parent[i].pid)
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/* one_process --- debugging mode variable; can be set from the command line
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* with the -X flag. If set, this gets you the child_main loop running
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* in the process which originally started up (no detach, no make_child),
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* which is a pretty nice debugging environment. (You'll get a SIGHUP
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* early in standalone_main; just continue through. This is the server
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* trying to kill off any child processes which it might have lying
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* around --- Apache doesn't keep track of their pids, it just sends
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* SIGHUP to the process group, ignoring it in the root process.
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* Continue through and you'll be fine.).
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*/
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static int one_process = 0;
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static apr_pool_t *pconf; /* Pool for config stuff */
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static apr_pool_t *pchild; /* Pool for httpd child stuff */
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static pid_t ap_my_pid; /* it seems silly to call getpid all the time */
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static pid_t parent_pid;
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static int my_child_num;
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#ifdef GPROF
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/*
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* change directory for gprof to plop the gmon.out file
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* configure in httpd.conf:
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* GprofDir $RuntimeDir/ -> $ServerRoot/$RuntimeDir/gmon.out
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* GprofDir $RuntimeDir/% -> $ServerRoot/$RuntimeDir/gprof.$pid/gmon.out
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*/
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static void chdir_for_gprof(void)
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{
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core_server_config *sconf =
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ap_get_core_module_config(ap_server_conf->module_config);
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char *dir = sconf->gprof_dir;
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const char *use_dir;
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if(dir) {
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apr_status_t res;
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char *buf = NULL ;
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int len = strlen(sconf->gprof_dir) - 1;
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if(*(dir + len) == '%') {
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dir[len] = '\0';
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buf = ap_append_pid(pconf, dir, "gprof.");
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}
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use_dir = ap_server_root_relative(pconf, buf ? buf : dir);
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res = apr_dir_make(use_dir,
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APR_UREAD | APR_UWRITE | APR_UEXECUTE |
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APR_GREAD | APR_GEXECUTE |
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APR_WREAD | APR_WEXECUTE, pconf);
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if(res != APR_SUCCESS && !APR_STATUS_IS_EEXIST(res)) {
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ap_log_error(APLOG_MARK, APLOG_ERR, res, ap_server_conf, APLOGNO(00142)
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"gprof: error creating directory %s", dir);
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}
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}
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else {
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use_dir = ap_runtime_dir_relative(pconf, "");
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}
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chdir(use_dir);
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}
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#else
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#define chdir_for_gprof()
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#endif
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static void prefork_note_child_killed(int childnum, pid_t pid,
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ap_generation_t gen)
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{
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AP_DEBUG_ASSERT(childnum != -1); /* no scoreboard squatting with this MPM */
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ap_run_child_status(ap_server_conf,
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ap_scoreboard_image->parent[childnum].pid,
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ap_scoreboard_image->parent[childnum].generation,
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childnum, MPM_CHILD_EXITED);
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ap_scoreboard_image->parent[childnum].pid = 0;
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}
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static void prefork_note_child_started(int slot, pid_t pid)
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{
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ap_generation_t gen = retained->mpm->my_generation;
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ap_scoreboard_image->parent[slot].pid = pid;
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ap_scoreboard_image->parent[slot].generation = gen;
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ap_run_child_status(ap_server_conf, pid, gen, slot, MPM_CHILD_STARTED);
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}
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/* a clean exit from a child with proper cleanup */
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static void clean_child_exit(int code) __attribute__ ((noreturn));
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static void clean_child_exit(int code)
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{
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retained->mpm->mpm_state = AP_MPMQ_STOPPING;
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apr_signal(SIGHUP, SIG_IGN);
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apr_signal(SIGTERM, SIG_IGN);
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if (code == 0) {
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ap_run_child_stopping(pchild, 0);
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}
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if (pchild) {
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apr_pool_destroy(pchild);
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}
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if (one_process) {
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prefork_note_child_killed(/* slot */ 0, 0, 0);
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}
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ap_mpm_pod_close(my_bucket->pod);
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chdir_for_gprof();
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exit(code);
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}
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static apr_status_t accept_mutex_on(void)
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{
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apr_status_t rv = apr_proc_mutex_lock(my_bucket->mutex);
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if (rv != APR_SUCCESS) {
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const char *msg = "couldn't grab the accept mutex";
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if (retained->mpm->my_generation !=
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ap_scoreboard_image->global->running_generation) {
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ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, ap_server_conf, APLOGNO(00143) "%s", msg);
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clean_child_exit(0);
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}
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else {
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ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, APLOGNO(00144) "%s", msg);
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exit(APEXIT_CHILDFATAL);
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}
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}
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return APR_SUCCESS;
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}
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static apr_status_t accept_mutex_off(void)
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{
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apr_status_t rv = apr_proc_mutex_unlock(my_bucket->mutex);
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if (rv != APR_SUCCESS) {
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const char *msg = "couldn't release the accept mutex";
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if (retained->mpm->my_generation !=
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ap_scoreboard_image->global->running_generation) {
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ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, ap_server_conf, APLOGNO(00145) "%s", msg);
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/* don't exit here... we have a connection to
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* process, after which point we'll see that the
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* generation changed and we'll exit cleanly
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*/
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}
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else {
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ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, APLOGNO(00146) "%s", msg);
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exit(APEXIT_CHILDFATAL);
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}
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}
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return APR_SUCCESS;
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}
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/* On some architectures it's safe to do unserialized accept()s in the single
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* Listen case. But it's never safe to do it in the case where there's
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* multiple Listen statements. Define SINGLE_LISTEN_UNSERIALIZED_ACCEPT
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* when it's safe in the single Listen case.
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*/
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#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
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#define SAFE_ACCEPT(stmt) (ap_listeners->next ? (stmt) : APR_SUCCESS)
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#else
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#define SAFE_ACCEPT(stmt) (stmt)
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#endif
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static int prefork_query(int query_code, int *result, apr_status_t *rv)
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{
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*rv = APR_SUCCESS;
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switch(query_code){
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case AP_MPMQ_MAX_DAEMON_USED:
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*result = ap_daemons_limit;
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break;
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case AP_MPMQ_IS_THREADED:
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*result = AP_MPMQ_NOT_SUPPORTED;
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break;
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case AP_MPMQ_IS_FORKED:
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*result = AP_MPMQ_DYNAMIC;
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break;
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case AP_MPMQ_HARD_LIMIT_DAEMONS:
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*result = server_limit;
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break;
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case AP_MPMQ_HARD_LIMIT_THREADS:
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*result = HARD_THREAD_LIMIT;
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break;
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case AP_MPMQ_MAX_THREADS:
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*result = 1;
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break;
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case AP_MPMQ_MIN_SPARE_DAEMONS:
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*result = ap_daemons_min_free;
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break;
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case AP_MPMQ_MIN_SPARE_THREADS:
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*result = 0;
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break;
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case AP_MPMQ_MAX_SPARE_DAEMONS:
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*result = ap_daemons_max_free;
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break;
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case AP_MPMQ_MAX_SPARE_THREADS:
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*result = 0;
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break;
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case AP_MPMQ_MAX_REQUESTS_DAEMON:
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*result = ap_max_requests_per_child;
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break;
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case AP_MPMQ_MAX_DAEMONS:
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*result = ap_daemons_limit;
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break;
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case AP_MPMQ_MPM_STATE:
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*result = retained->mpm->mpm_state;
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break;
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case AP_MPMQ_GENERATION:
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*result = retained->mpm->my_generation;
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break;
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default:
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*rv = APR_ENOTIMPL;
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break;
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}
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return OK;
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}
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static const char *prefork_get_name(void)
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{
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return "prefork";
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}
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/*****************************************************************
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* Connection structures and accounting...
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*/
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static void just_die(int sig)
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{
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clean_child_exit(0);
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}
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/* volatile because it's updated from a signal handler */
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static int volatile die_now = 0;
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static void stop_listening(int sig)
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{
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retained->mpm->mpm_state = AP_MPMQ_STOPPING;
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ap_close_listeners_ex(my_bucket->listeners);
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/* For a graceful stop, we want the child to exit when done */
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die_now = 1;
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}
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/*****************************************************************
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* Child process main loop.
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* The following vars are static to avoid getting clobbered by longjmp();
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* they are really private to child_main.
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*/
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static int requests_this_child;
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static int num_listensocks = 0;
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#if APR_HAS_THREADS
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static void child_sigmask(sigset_t *new_mask, sigset_t *old_mask)
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{
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#if defined(SIGPROCMASK_SETS_THREAD_MASK)
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sigprocmask(SIG_SETMASK, new_mask, old_mask);
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#else
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pthread_sigmask(SIG_SETMASK, new_mask, old_mask);
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#endif
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}
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#endif
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static void child_main(int child_num_arg, int child_bucket)
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{
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#if APR_HAS_THREADS
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apr_thread_t *thd = NULL;
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sigset_t sig_mask;
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#endif
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apr_pool_t *ptrans;
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apr_allocator_t *allocator;
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apr_status_t status;
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int i;
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ap_listen_rec *lr;
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apr_pollset_t *pollset;
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ap_sb_handle_t *sbh;
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apr_bucket_alloc_t *bucket_alloc;
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int last_poll_idx = 0;
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const char *lockfile;
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/* for benefit of any hooks that run as this child initializes */
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retained->mpm->mpm_state = AP_MPMQ_STARTING;
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my_child_num = child_num_arg;
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ap_my_pid = getpid();
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requests_this_child = 0;
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ap_fatal_signal_child_setup(ap_server_conf);
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/* Get a sub context for global allocations in this child, so that
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* we can have cleanups occur when the child exits.
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*/
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apr_allocator_create(&allocator);
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apr_allocator_max_free_set(allocator, ap_max_mem_free);
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apr_pool_create_ex(&pchild, pconf, NULL, allocator);
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apr_allocator_owner_set(allocator, pchild);
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apr_pool_tag(pchild, "pchild");
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#if AP_HAS_THREAD_LOCAL
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if (one_process) {
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thd = ap_thread_current();
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}
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else if ((status = ap_thread_main_create(&thd, pchild))) {
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ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf, APLOGNO(10378)
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"Couldn't initialize child main thread");
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clean_child_exit(APEXIT_CHILDFATAL);
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}
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#elif APR_HAS_THREADS
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{
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apr_os_thread_t osthd = apr_os_thread_current();
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apr_os_thread_put(&thd, &osthd, pchild);
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}
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#endif
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#if APR_HAS_THREADS
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ap_assert(thd != NULL);
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#endif
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apr_pool_create(&ptrans, pchild);
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apr_pool_tag(ptrans, "transaction");
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/* close unused listeners and pods */
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for (i = 0; i < retained->mpm->num_buckets; i++) {
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if (i != child_bucket) {
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ap_close_listeners_ex(all_buckets[i].listeners);
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ap_mpm_pod_close(all_buckets[i].pod);
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}
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}
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/* needs to be done before we switch UIDs so we have permissions */
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ap_reopen_scoreboard(pchild, NULL, 0);
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status = SAFE_ACCEPT(apr_proc_mutex_child_init(&my_bucket->mutex,
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apr_proc_mutex_lockfile(my_bucket->mutex),
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pchild));
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if (status != APR_SUCCESS) {
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lockfile = apr_proc_mutex_lockfile(my_bucket->mutex);
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ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf, APLOGNO(00155)
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"Couldn't initialize cross-process lock in child "
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"(%s) (%s)",
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lockfile ? lockfile : "none",
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apr_proc_mutex_name(my_bucket->mutex));
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clean_child_exit(APEXIT_CHILDFATAL);
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}
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if (ap_run_drop_privileges(pchild, ap_server_conf)) {
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clean_child_exit(APEXIT_CHILDFATAL);
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}
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#if APR_HAS_THREADS
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/* Save the signal mask and block all the signals from being received by
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* threads potentially created in child_init() hooks (e.g. mod_watchdog).
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*/
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child_sigmask(NULL, &sig_mask);
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{
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apr_status_t rv;
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rv = apr_setup_signal_thread();
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if (rv != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, APLOGNO(10271)
|
|
"Couldn't initialize signal thread");
|
|
clean_child_exit(APEXIT_CHILDFATAL);
|
|
}
|
|
}
|
|
#endif /* APR_HAS_THREADS */
|
|
|
|
ap_run_child_init(pchild, ap_server_conf);
|
|
|
|
#if APR_HAS_THREADS
|
|
/* Restore the original signal mask for this main thread, the only one
|
|
* that should possibly get interrupted by signals.
|
|
*/
|
|
child_sigmask(&sig_mask, NULL);
|
|
#endif
|
|
|
|
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,
|
|
APR_POLLSET_NOCOPY);
|
|
if (status != APR_SUCCESS) {
|
|
ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf, APLOGNO(00156)
|
|
"Couldn't create pollset in child; check system or user limits");
|
|
clean_child_exit(APEXIT_CHILDSICK); /* assume temporary resource issue */
|
|
}
|
|
|
|
for (lr = my_bucket->listeners, i = num_listensocks; i--; lr = lr->next) {
|
|
apr_pollfd_t *pfd = apr_pcalloc(pchild, sizeof *pfd);
|
|
|
|
pfd->desc_type = APR_POLL_SOCKET;
|
|
pfd->desc.s = lr->sd;
|
|
pfd->reqevents = APR_POLLIN;
|
|
pfd->client_data = lr;
|
|
|
|
status = apr_pollset_add(pollset, pfd);
|
|
if (status != APR_SUCCESS) {
|
|
/* If the child processed a SIGWINCH before setting up the
|
|
* pollset, this error path is expected and harmless,
|
|
* since the listener fd was already closed; so don't
|
|
* pollute the logs in that case. */
|
|
if (!die_now) {
|
|
ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf, APLOGNO(00157)
|
|
"Couldn't add listener to pollset; check system or user limits");
|
|
clean_child_exit(APEXIT_CHILDSICK);
|
|
}
|
|
clean_child_exit(0);
|
|
}
|
|
|
|
lr->accept_func = ap_unixd_accept;
|
|
}
|
|
|
|
retained->mpm->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,restart}_pending are set when a signal is received while
|
|
* running in single process mode.
|
|
*/
|
|
while (!die_now
|
|
&& !retained->mpm->shutdown_pending
|
|
&& !retained->mpm->restart_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 = my_bucket->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 (die_now /* in graceful stop/restart */
|
|
|| retained->mpm->shutdown_pending
|
|
|| retained->mpm->restart_pending) {
|
|
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, APLOGNO(00158) "apr_pollset_poll: (listen)");
|
|
SAFE_ACCEPT(accept_mutex_off());
|
|
clean_child_exit(APEXIT_CHILDSICK);
|
|
}
|
|
|
|
/* 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 occurred */
|
|
clean_child_exit(APEXIT_CHILDSICK);
|
|
}
|
|
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(my_bucket->pod) == APR_SUCCESS) { /* selected as idle? */
|
|
die_now = 1;
|
|
}
|
|
else if (retained->mpm->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;
|
|
}
|
|
}
|
|
apr_pool_clear(ptrans); /* kludge to avoid crash in APR reslist cleanup code */
|
|
clean_child_exit(0);
|
|
}
|
|
|
|
|
|
static int make_child(server_rec *s, int slot)
|
|
{
|
|
int bucket = slot % retained->mpm->num_buckets;
|
|
int pid;
|
|
|
|
if (slot + 1 > retained->max_daemons_limit) {
|
|
retained->max_daemons_limit = slot + 1;
|
|
}
|
|
|
|
if (one_process) {
|
|
my_bucket = &all_buckets[0];
|
|
|
|
prefork_note_child_started(slot, getpid());
|
|
child_main(slot, 0);
|
|
/* NOTREACHED */
|
|
ap_assert(0);
|
|
return -1;
|
|
}
|
|
|
|
(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, APLOGNO(00159) "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) {
|
|
#if AP_HAS_THREAD_LOCAL
|
|
ap_thread_current_after_fork();
|
|
#endif
|
|
|
|
my_bucket = &all_buckets[bucket];
|
|
|
|
#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_DEBUG, errno,
|
|
ap_server_conf, APLOGNO(00160) "processor unbind failed");
|
|
}
|
|
#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);
|
|
/* Ignore SIGINT in child. This fixes race-conditions in signals
|
|
* handling when httpd is running on foreground and user hits ctrl+c.
|
|
* In this case, SIGINT is sent to all children followed by SIGTERM
|
|
* from the main process, which interrupts the SIGINT handler and
|
|
* leads to inconsistency.
|
|
*/
|
|
apr_signal(SIGINT, SIG_IGN);
|
|
/* 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, bucket);
|
|
}
|
|
|
|
prefork_note_child_started(slot, 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;
|
|
}
|
|
}
|
|
|
|
static void perform_idle_server_maintenance(apr_pool_t *p)
|
|
{
|
|
int i;
|
|
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;
|
|
|
|
idle_count = 0;
|
|
last_non_dead = -1;
|
|
total_non_dead = 0;
|
|
|
|
for (i = 0; i < ap_daemons_limit; ++i) {
|
|
int status;
|
|
|
|
if (i >= retained->max_daemons_limit && free_length == retained->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 < retained->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;
|
|
}
|
|
|
|
++total_non_dead;
|
|
last_non_dead = i;
|
|
}
|
|
}
|
|
retained->max_daemons_limit = last_non_dead + 1;
|
|
if (idle_count > ap_daemons_max_free) {
|
|
static int bucket_kill_child_record = -1;
|
|
/* 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
|
|
*/
|
|
bucket_kill_child_record = (bucket_kill_child_record + 1) % retained->mpm->num_buckets;
|
|
ap_mpm_pod_signal(all_buckets[bucket_kill_child_record].pod);
|
|
retained->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 */
|
|
if (!retained->maxclients_reported) {
|
|
ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(00161)
|
|
"server reached MaxRequestWorkers setting, consider"
|
|
" raising the MaxRequestWorkers setting");
|
|
retained->maxclients_reported = 1;
|
|
}
|
|
retained->idle_spawn_rate = 1;
|
|
}
|
|
else {
|
|
if (retained->idle_spawn_rate >= 8) {
|
|
ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(00162)
|
|
"server seems busy, (you may need "
|
|
"to increase StartServers, or Min/MaxSpareServers), "
|
|
"spawning %d children, there are %d idle, and "
|
|
"%d total children", retained->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 (retained->hold_off_on_exponential_spawning) {
|
|
--retained->hold_off_on_exponential_spawning;
|
|
}
|
|
else if (retained->idle_spawn_rate < MAX_SPAWN_RATE) {
|
|
retained->idle_spawn_rate *= 2;
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
retained->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;
|
|
int i;
|
|
|
|
ap_log_pid(pconf, ap_pid_fname);
|
|
|
|
if (!retained->mpm->was_graceful) {
|
|
if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
|
|
retained->mpm->mpm_state = AP_MPMQ_STOPPING;
|
|
return !OK;
|
|
}
|
|
/* fix the generation number in the global score; we just got a new,
|
|
* cleared scoreboard
|
|
*/
|
|
ap_scoreboard_image->global->running_generation = retained->mpm->my_generation;
|
|
}
|
|
|
|
ap_unixd_mpm_set_signals(pconf, one_process);
|
|
|
|
if (one_process) {
|
|
AP_MONCONTROL(1);
|
|
make_child(ap_server_conf, 0);
|
|
/* NOTREACHED */
|
|
ap_assert(0);
|
|
return !OK;
|
|
}
|
|
|
|
/* Don't thrash since num_buckets depends on the
|
|
* system and the number of online CPU cores...
|
|
*/
|
|
if (ap_daemons_limit < retained->mpm->num_buckets)
|
|
ap_daemons_limit = retained->mpm->num_buckets;
|
|
if (ap_daemons_to_start < retained->mpm->num_buckets)
|
|
ap_daemons_to_start = retained->mpm->num_buckets;
|
|
if (ap_daemons_min_free < retained->mpm->num_buckets)
|
|
ap_daemons_min_free = retained->mpm->num_buckets;
|
|
if (ap_daemons_max_free < ap_daemons_min_free + retained->mpm->num_buckets)
|
|
ap_daemons_max_free = ap_daemons_min_free + retained->mpm->num_buckets;
|
|
|
|
/* 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 (!retained->mpm->was_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
|
|
*/
|
|
retained->hold_off_on_exponential_spawning = 10;
|
|
}
|
|
|
|
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00163)
|
|
"%s configured -- resuming normal operations",
|
|
ap_get_server_description());
|
|
ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(00164)
|
|
"Server built: %s", ap_get_server_built());
|
|
ap_log_command_line(plog, s);
|
|
ap_log_mpm_common(s);
|
|
ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00165)
|
|
"Accept mutex: %s (default: %s)",
|
|
(all_buckets[0].mutex)
|
|
? apr_proc_mutex_name(all_buckets[0].mutex)
|
|
: "none",
|
|
apr_proc_mutex_defname());
|
|
|
|
retained->mpm->mpm_state = AP_MPMQ_RUNNING;
|
|
|
|
while (!retained->mpm->restart_pending && !retained->mpm->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, ap_server_conf);
|
|
|
|
/* 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);
|
|
child_slot = ap_find_child_by_pid(&pid);
|
|
if (processed_status == APEXIT_CHILDFATAL) {
|
|
/* fix race condition found in PR 39311
|
|
* A child created at the same time as a graceful happens
|
|
* can find the lock missing and create a fatal error.
|
|
* It is not fatal for the last generation to be in this state.
|
|
*/
|
|
if (child_slot < 0
|
|
|| ap_get_scoreboard_process(child_slot)->generation
|
|
== retained->mpm->my_generation) {
|
|
retained->mpm->mpm_state = AP_MPMQ_STOPPING;
|
|
return !OK;
|
|
}
|
|
else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, ap_server_conf, APLOGNO(00166)
|
|
"Ignoring fatal error in child of previous "
|
|
"generation (pid %ld).",
|
|
(long)pid.pid);
|
|
}
|
|
}
|
|
|
|
/* non-fatal death... note that it's gone in the scoreboard. */
|
|
if (child_slot >= 0) {
|
|
(void) ap_update_child_status_from_indexes(child_slot, 0, SERVER_DEAD,
|
|
(request_rec *) NULL);
|
|
prefork_note_child_killed(child_slot, 0, 0);
|
|
if (processed_status == APEXIT_CHILDSICK) {
|
|
/* child detected a resource shortage (E[NM]FILE, ENOBUFS, etc)
|
|
* cut the fork rate to the minimum
|
|
*/
|
|
retained->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 (retained->mpm->was_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, APLOGNO(00167)
|
|
"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);
|
|
}
|
|
|
|
retained->mpm->mpm_state = AP_MPMQ_STOPPING;
|
|
|
|
if (retained->mpm->shutdown_pending && retained->mpm->is_ungraceful) {
|
|
/* 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, APLOGNO(00168) "killpg SIGTERM");
|
|
}
|
|
ap_reclaim_child_processes(1, /* Start with SIGTERM */
|
|
prefork_note_child_killed);
|
|
|
|
/* cleanup pid file on normal shutdown */
|
|
ap_remove_pid(pconf, ap_pid_fname);
|
|
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00169)
|
|
"caught SIGTERM, shutting down");
|
|
|
|
return DONE;
|
|
}
|
|
|
|
if (retained->mpm->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 */
|
|
for (i = 0; i < retained->mpm->num_buckets; i++) {
|
|
ap_mpm_pod_killpg(all_buckets[i].pod, retained->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(prefork_note_child_killed);
|
|
|
|
/* cleanup pid file */
|
|
ap_remove_pid(pconf, ap_pid_fname);
|
|
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00170)
|
|
"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 */
|
|
retained->mpm->shutdown_pending = 0;
|
|
do {
|
|
/* Pause for a second */
|
|
sleep(1);
|
|
|
|
/* Relieve any children which have now exited */
|
|
ap_relieve_child_processes(prefork_note_child_killed);
|
|
|
|
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 (!retained->mpm->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 DONE;
|
|
}
|
|
|
|
/* we've been told to restart */
|
|
if (one_process) {
|
|
/* not worth thinking about */
|
|
return DONE;
|
|
}
|
|
|
|
/* 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.
|
|
*/
|
|
++retained->mpm->my_generation;
|
|
ap_scoreboard_image->global->running_generation = retained->mpm->my_generation;
|
|
|
|
if (!retained->mpm->is_ungraceful) {
|
|
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00171)
|
|
"Graceful restart requested, doing restart");
|
|
|
|
/* kill off the idle ones */
|
|
for (i = 0; i < retained->mpm->num_buckets; i++) {
|
|
ap_mpm_pod_killpg(all_buckets[i].pod, retained->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, APLOGNO(00172) "killpg SIGHUP");
|
|
}
|
|
ap_reclaim_child_processes(0, /* Not when just starting up */
|
|
prefork_note_child_killed);
|
|
ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00173)
|
|
"SIGHUP received. Attempting to restart");
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
/* 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;
|
|
ap_listen_rec **listen_buckets;
|
|
apr_status_t rv;
|
|
char id[16];
|
|
int i;
|
|
|
|
pconf = p;
|
|
|
|
/* the reverse of pre_config, we want this only the first time around */
|
|
if (retained->mpm->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 !OK;
|
|
}
|
|
|
|
if (one_process) {
|
|
retained->mpm->num_buckets = 1;
|
|
}
|
|
else if (!retained->mpm->was_graceful) {
|
|
/* Preserve the number of buckets on graceful restarts. */
|
|
retained->mpm->num_buckets = 0;
|
|
}
|
|
if ((rv = ap_duplicate_listeners(pconf, ap_server_conf,
|
|
&listen_buckets, &retained->mpm->num_buckets))) {
|
|
ap_log_error(APLOG_MARK, APLOG_CRIT | level_flags, rv,
|
|
(startup ? NULL : s),
|
|
"could not duplicate listeners");
|
|
return !OK;
|
|
}
|
|
all_buckets = apr_pcalloc(pconf, retained->mpm->num_buckets *
|
|
sizeof(prefork_child_bucket));
|
|
for (i = 0; i < retained->mpm->num_buckets; i++) {
|
|
if ((rv = ap_mpm_pod_open(pconf, &all_buckets[i].pod))) {
|
|
ap_log_error(APLOG_MARK, APLOG_CRIT | level_flags, rv,
|
|
(startup ? NULL : s),
|
|
"could not open pipe-of-death");
|
|
return !OK;
|
|
}
|
|
/* Initialize cross-process accept lock (safe accept needed only) */
|
|
if ((rv = SAFE_ACCEPT((apr_snprintf(id, sizeof id, "%i", i),
|
|
ap_proc_mutex_create(&all_buckets[i].mutex,
|
|
NULL, AP_ACCEPT_MUTEX_TYPE,
|
|
id, s, pconf, 0))))) {
|
|
ap_log_error(APLOG_MARK, APLOG_CRIT | level_flags, rv,
|
|
(startup ? NULL : s),
|
|
"could not create accept mutex");
|
|
return !OK;
|
|
}
|
|
all_buckets[i].listeners = listen_buckets[i];
|
|
}
|
|
|
|
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";
|
|
|
|
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");
|
|
}
|
|
|
|
ap_mutex_register(p, AP_ACCEPT_MUTEX_TYPE, NULL, APR_LOCK_DEFAULT, 0);
|
|
|
|
retained = ap_retained_data_get(userdata_key);
|
|
if (!retained) {
|
|
retained = ap_retained_data_create(userdata_key, sizeof(*retained));
|
|
retained->mpm = ap_unixd_mpm_get_retained_data();
|
|
retained->idle_spawn_rate = 1;
|
|
}
|
|
retained->mpm->mpm_state = AP_MPMQ_STARTING;
|
|
if (retained->mpm->baton != retained) {
|
|
retained->mpm->was_graceful = 0;
|
|
retained->mpm->baton = retained;
|
|
}
|
|
++retained->mpm->module_loads;
|
|
|
|
/* sigh, want this only the second time around */
|
|
if (retained->mpm->module_loads == 2) {
|
|
if (!one_process && !foreground) {
|
|
/* before we detach, setup crash handlers to log to errorlog */
|
|
ap_fatal_signal_setup(ap_server_conf, p /* == pconf */);
|
|
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, APLOGNO(00174)
|
|
"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_extended_status = 0;
|
|
|
|
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->mpm->module_loads == 1) {
|
|
startup = 1;
|
|
}
|
|
|
|
if (server_limit > MAX_SERVER_LIMIT) {
|
|
if (startup) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00175)
|
|
"WARNING: ServerLimit of %d exceeds compile-time "
|
|
"limit of %d servers, decreasing to %d.",
|
|
server_limit, MAX_SERVER_LIMIT, MAX_SERVER_LIMIT);
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00176)
|
|
"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, APLOGNO(00177)
|
|
"WARNING: ServerLimit of %d not allowed, "
|
|
"increasing to 1.", server_limit);
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00178)
|
|
"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, APLOGNO(00179)
|
|
"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, APLOGNO(00180)
|
|
"WARNING: MaxRequestWorkers of %d exceeds ServerLimit "
|
|
"value of %d servers, decreasing MaxRequestWorkers to %d. "
|
|
"To increase, please see the ServerLimit directive.",
|
|
ap_daemons_limit, server_limit, server_limit);
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00181)
|
|
"MaxRequestWorkers 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, APLOGNO(00182)
|
|
"WARNING: MaxRequestWorkers of %d not allowed, "
|
|
"increasing to 1.", ap_daemons_limit);
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00183)
|
|
"MaxRequestWorkers 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 < 1) {
|
|
if (startup) {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00184)
|
|
"WARNING: StartServers of %d not allowed, "
|
|
"increasing to 1.", ap_daemons_to_start);
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00185)
|
|
"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, APLOGNO(00186)
|
|
"WARNING: MinSpareServers of %d not allowed, "
|
|
"increasing to 1 to avoid almost certain server failure. "
|
|
"Please read the documentation.", ap_daemons_min_free);
|
|
} else {
|
|
ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00187)
|
|
"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_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;
|
|
}
|
|
if (!strcasecmp(cmd->cmd->name, "MaxClients")) {
|
|
ap_log_error(APLOG_MARK, APLOG_INFO, 0, NULL, APLOGNO(00188)
|
|
"MaxClients is deprecated, use MaxRequestWorkers "
|
|
"instead.");
|
|
}
|
|
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,
|
|
"Deprecated name of MaxRequestWorkers"),
|
|
AP_INIT_TAKE1("MaxRequestWorkers", 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 MaxRequestWorkers for this run of Apache"),
|
|
AP_GRACEFUL_SHUTDOWN_TIMEOUT_COMMAND,
|
|
{ NULL }
|
|
};
|
|
|
|
AP_DECLARE_MODULE(mpm_prefork) = {
|
|
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 */
|
|
};
|