| /* Licensed to the Apache Software Foundation (ASF) under one or more | |
| * contributor license agreements. See the NOTICE file distributed with | |
| * this work for additional information regarding copyright ownership. | |
| * The ASF licenses this file to You under the Apache License, Version 2.0 | |
| * (the "License"); you may not use this file except in compliance with | |
| * the License. You may obtain a copy of the License at | |
| * | |
| * http://www.apache.org/licenses/LICENSE-2.0 | |
| * | |
| * Unless required by applicable law or agreed to in writing, software | |
| * distributed under the License is distributed on an "AS IS" BASIS, | |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| * See the License for the specific language governing permissions and | |
| * limitations under the License. | |
| */ | |
| #include "apr.h" | |
| #include "apr_portable.h" | |
| #include "apr_strings.h" | |
| #include "apr_thread_proc.h" | |
| #include "apr_signal.h" | |
| #define APR_WANT_STDIO | |
| #define APR_WANT_STRFUNC | |
| #include "apr_want.h" | |
| #if APR_HAVE_UNISTD_H | |
| #include <unistd.h> | |
| #endif | |
| #if APR_HAVE_SYS_TYPES_H | |
| #include <sys/types.h> | |
| #endif | |
| #include "ap_config.h" | |
| #include "httpd.h" | |
| #include "mpm_default.h" | |
| #include "http_main.h" | |
| #include "http_log.h" | |
| #include "http_config.h" | |
| #include "http_core.h" /* for get_remote_host */ | |
| #include "http_connection.h" | |
| #include "scoreboard.h" | |
| #include "ap_mpm.h" | |
| #include "util_mutex.h" | |
| #include "unixd.h" | |
| #include "mpm_common.h" | |
| #include "ap_listen.h" | |
| #include "ap_mmn.h" | |
| #include "apr_poll.h" | |
| #include "util_time.h" | |
| #include <stdlib.h> | |
| #ifdef HAVE_TIME_H | |
| #include <time.h> | |
| #endif | |
| #ifdef HAVE_SYS_PROCESSOR_H | |
| #include <sys/processor.h> /* for bindprocessor() */ | |
| #endif | |
| #include <signal.h> | |
| #include <sys/times.h> | |
| /* Limit on the total --- clients will be locked out if more servers than | |
| * this are needed. It is intended solely to keep the server from crashing | |
| * when things get out of hand. | |
| * | |
| * We keep a hard maximum number of servers, for two reasons --- first off, | |
| * in case something goes seriously wrong, we want to stop the fork bomb | |
| * short of actually crashing the machine we're running on by filling some | |
| * kernel table. Secondly, it keeps the size of the scoreboard file small | |
| * enough that we can read the whole thing without worrying too much about | |
| * the overhead. | |
| */ | |
| #ifndef DEFAULT_SERVER_LIMIT | |
| #define DEFAULT_SERVER_LIMIT 256 | |
| #endif | |
| /* Admin can't tune ServerLimit beyond MAX_SERVER_LIMIT. We want | |
| * some sort of compile-time limit to help catch typos. | |
| */ | |
| #ifndef MAX_SERVER_LIMIT | |
| #define MAX_SERVER_LIMIT 200000 | |
| #endif | |
| #ifndef HARD_THREAD_LIMIT | |
| #define HARD_THREAD_LIMIT 1 | |
| #endif | |
| /* config globals */ | |
| static int ap_daemons_to_start=0; | |
| static int ap_daemons_min_free=0; | |
| static int ap_daemons_max_free=0; | |
| static int ap_daemons_limit=0; /* MaxRequestWorkers */ | |
| static int server_limit = 0; | |
| typedef struct prefork_child_bucket { | |
| ap_pod_t *pod; | |
| ap_listen_rec *listeners; | |
| apr_proc_mutex_t *mutex; | |
| } prefork_child_bucket; | |
| static prefork_child_bucket *my_bucket; /* Current child bucket */ | |
| /* data retained by prefork across load/unload of the module | |
| * allocated on first call to pre-config hook; located on | |
| * subsequent calls to pre-config hook | |
| */ | |
| typedef struct prefork_retained_data { | |
| ap_unixd_mpm_retained_data *mpm; | |
| apr_pool_t *gen_pool; /* generation pool (children start->stop lifetime) */ | |
| prefork_child_bucket *buckets; /* children buckets (reset per generation) */ | |
| int first_server_limit; | |
| int maxclients_reported; | |
| /* | |
| * The max child slot ever assigned, preserved across restarts. Necessary | |
| * to deal with MaxRequestWorkers changes across AP_SIG_GRACEFUL restarts. We | |
| * use this value to optimize routines that have to scan the entire scoreboard. | |
| */ | |
| int max_daemons_limit; | |
| /* | |
| * 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. | |
| */ | |
| int idle_spawn_rate; | |
| #ifndef MAX_SPAWN_RATE | |
| #define MAX_SPAWN_RATE (32) | |
| #endif | |
| int hold_off_on_exponential_spawning; | |
| } prefork_retained_data; | |
| static prefork_retained_data *retained; | |
| #define MPM_CHILD_PID(i) (ap_scoreboard_image->parent[i].pid) | |
| /* one_process --- debugging mode variable; can be set from the command line | |
| * with the -X flag. If set, this gets you the child_main loop running | |
| * in the process which originally started up (no detach, no make_child), | |
| * which is a pretty nice debugging environment. (You'll get a SIGHUP | |
| * early in standalone_main; just continue through. This is the server | |
| * trying to kill off any child processes which it might have lying | |
| * around --- Apache doesn't keep track of their pids, it just sends | |
| * SIGHUP to the process group, ignoring it in the root process. | |
| * Continue through and you'll be fine.). | |
| */ | |
| static int one_process = 0; | |
| static apr_pool_t *pconf; /* Pool for config stuff */ | |
| static apr_pool_t *pchild; /* Pool for httpd child stuff */ | |
| static pid_t ap_my_pid; /* it seems silly to call getpid all the time */ | |
| static pid_t parent_pid; | |
| static int my_child_num; | |
| #ifdef GPROF | |
| /* | |
| * change directory for gprof to plop the gmon.out file | |
| * configure in httpd.conf: | |
| * GprofDir $RuntimeDir/ -> $ServerRoot/$RuntimeDir/gmon.out | |
| * GprofDir $RuntimeDir/% -> $ServerRoot/$RuntimeDir/gprof.$pid/gmon.out | |
| */ | |
| static void chdir_for_gprof(void) | |
| { | |
| core_server_config *sconf = | |
| ap_get_core_module_config(ap_server_conf->module_config); | |
| char *dir = sconf->gprof_dir; | |
| const char *use_dir; | |
| if(dir) { | |
| apr_status_t res; | |
| char *buf = NULL ; | |
| int len = strlen(sconf->gprof_dir) - 1; | |
| if(*(dir + len) == '%') { | |
| dir[len] = '\0'; | |
| buf = ap_append_pid(pconf, dir, "gprof."); | |
| } | |
| use_dir = ap_server_root_relative(pconf, buf ? buf : dir); | |
| res = apr_dir_make(use_dir, | |
| APR_UREAD | APR_UWRITE | APR_UEXECUTE | | |
| APR_GREAD | APR_GEXECUTE | | |
| APR_WREAD | APR_WEXECUTE, pconf); | |
| if(res != APR_SUCCESS && !APR_STATUS_IS_EEXIST(res)) { | |
| ap_log_error(APLOG_MARK, APLOG_ERR, res, ap_server_conf, APLOGNO(00142) | |
| "gprof: error creating directory %s", dir); | |
| } | |
| } | |
| else { | |
| use_dir = ap_runtime_dir_relative(pconf, ""); | |
| } | |
| chdir(use_dir); | |
| } | |
| #else | |
| #define chdir_for_gprof() | |
| #endif | |
| static void prefork_note_child_killed(int childnum, pid_t pid, | |
| ap_generation_t gen) | |
| { | |
| AP_DEBUG_ASSERT(childnum != -1); /* no scoreboard squatting with this MPM */ | |
| ap_run_child_status(ap_server_conf, | |
| ap_scoreboard_image->parent[childnum].pid, | |
| ap_scoreboard_image->parent[childnum].generation, | |
| childnum, MPM_CHILD_EXITED); | |
| ap_scoreboard_image->parent[childnum].pid = 0; | |
| } | |
| static void prefork_note_child_started(int slot, pid_t pid) | |
| { | |
| ap_generation_t gen = retained->mpm->my_generation; | |
| ap_scoreboard_image->parent[slot].pid = pid; | |
| ap_scoreboard_image->parent[slot].generation = gen; | |
| ap_run_child_status(ap_server_conf, pid, gen, slot, MPM_CHILD_STARTED); | |
| } | |
| /* a clean exit from a child with proper cleanup */ | |
| static void clean_child_exit_ex(int code, int from_signal) __attribute__ ((noreturn)); | |
| static void clean_child_exit_ex(int code, int from_signal) | |
| { | |
| apr_signal(SIGHUP, SIG_IGN); | |
| apr_signal(SIGTERM, SIG_IGN); | |
| retained->mpm->mpm_state = AP_MPMQ_STOPPING; | |
| if (pchild) { | |
| if (!code && !from_signal) { | |
| ap_run_child_stopping(pchild, !retained->mpm->is_ungraceful); | |
| if (!retained->mpm->is_ungraceful) { | |
| ap_mpm_wait_for_extra_connections(); | |
| } | |
| ap_run_child_stopped(pchild, !retained->mpm->is_ungraceful); | |
| } | |
| apr_pool_destroy(pchild); | |
| /* | |
| * Be safe in case someone still uses afterwards or we get here again. | |
| * Should not happen. | |
| */ | |
| pchild = NULL; | |
| } | |
| if (one_process) { | |
| prefork_note_child_killed(/* slot */ 0, 0, 0); | |
| /* no POD to close in one_process mode */ | |
| } | |
| else { | |
| ap_mpm_pod_close(my_bucket->pod); | |
| } | |
| chdir_for_gprof(); | |
| exit(code); | |
| } | |
| /* a clean exit from a child with proper cleanup */ | |
| static void clean_child_exit(int code) __attribute__ ((noreturn)); | |
| static void clean_child_exit(int code) | |
| { | |
| clean_child_exit_ex(code, 0); | |
| } | |
| static apr_status_t accept_mutex_on(void) | |
| { | |
| apr_status_t rv = apr_proc_mutex_lock(my_bucket->mutex); | |
| if (rv != APR_SUCCESS) { | |
| const char *msg = "couldn't grab the accept mutex"; | |
| if (retained->mpm->my_generation != | |
| ap_scoreboard_image->global->running_generation) { | |
| ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, ap_server_conf, APLOGNO(00143) "%s", msg); | |
| clean_child_exit(0); | |
| } | |
| else { | |
| ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, APLOGNO(00144) "%s", msg); | |
| exit(APEXIT_CHILDFATAL); | |
| } | |
| } | |
| return APR_SUCCESS; | |
| } | |
| static apr_status_t accept_mutex_off(void) | |
| { | |
| apr_status_t rv = apr_proc_mutex_unlock(my_bucket->mutex); | |
| if (rv != APR_SUCCESS) { | |
| const char *msg = "couldn't release the accept mutex"; | |
| if (retained->mpm->my_generation != | |
| ap_scoreboard_image->global->running_generation) { | |
| ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, ap_server_conf, APLOGNO(00145) "%s", msg); | |
| /* don't exit here... we have a connection to | |
| * process, after which point we'll see that the | |
| * generation changed and we'll exit cleanly | |
| */ | |
| } | |
| else { | |
| ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, APLOGNO(00146) "%s", msg); | |
| exit(APEXIT_CHILDFATAL); | |
| } | |
| } | |
| return APR_SUCCESS; | |
| } | |
| /* On some architectures it's safe to do unserialized accept()s in the single | |
| * Listen case. But it's never safe to do it in the case where there's | |
| * multiple Listen statements. Define SINGLE_LISTEN_UNSERIALIZED_ACCEPT | |
| * when it's safe in the single Listen case. | |
| */ | |
| #ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT | |
| #define SAFE_ACCEPT(stmt) (ap_listeners->next ? (stmt) : APR_SUCCESS) | |
| #else | |
| #define SAFE_ACCEPT(stmt) (stmt) | |
| #endif | |
| static int prefork_query(int query_code, int *result, apr_status_t *rv) | |
| { | |
| *rv = APR_SUCCESS; | |
| switch(query_code){ | |
| case AP_MPMQ_MAX_DAEMON_USED: | |
| *result = ap_daemons_limit; | |
| break; | |
| case AP_MPMQ_IS_THREADED: | |
| *result = AP_MPMQ_NOT_SUPPORTED; | |
| break; | |
| case AP_MPMQ_IS_FORKED: | |
| *result = AP_MPMQ_DYNAMIC; | |
| break; | |
| case AP_MPMQ_HARD_LIMIT_DAEMONS: | |
| *result = server_limit; | |
| break; | |
| case AP_MPMQ_HARD_LIMIT_THREADS: | |
| *result = HARD_THREAD_LIMIT; | |
| break; | |
| case AP_MPMQ_MAX_THREADS: | |
| *result = 1; | |
| break; | |
| case AP_MPMQ_MIN_SPARE_DAEMONS: | |
| *result = ap_daemons_min_free; | |
| break; | |
| case AP_MPMQ_MIN_SPARE_THREADS: | |
| *result = 0; | |
| break; | |
| case AP_MPMQ_MAX_SPARE_DAEMONS: | |
| *result = ap_daemons_max_free; | |
| break; | |
| case AP_MPMQ_MAX_SPARE_THREADS: | |
| *result = 0; | |
| break; | |
| case AP_MPMQ_MAX_REQUESTS_DAEMON: | |
| *result = ap_max_requests_per_child; | |
| break; | |
| case AP_MPMQ_MAX_DAEMONS: | |
| *result = ap_daemons_limit; | |
| break; | |
| case AP_MPMQ_MPM_STATE: | |
| *result = retained->mpm->mpm_state; | |
| break; | |
| case AP_MPMQ_GENERATION: | |
| *result = retained->mpm->my_generation; | |
| break; | |
| default: | |
| *rv = APR_ENOTIMPL; | |
| break; | |
| } | |
| return OK; | |
| } | |
| static const char *prefork_get_name(void) | |
| { | |
| return "prefork"; | |
| } | |
| /***************************************************************** | |
| * Connection structures and accounting... | |
| */ | |
| static void just_die(int sig) | |
| { | |
| clean_child_exit_ex(0, 1); | |
| } | |
| /* volatile because it's updated from a signal handler */ | |
| static int volatile die_now = 0; | |
| static void stop_listening(int sig) | |
| { | |
| retained->mpm->mpm_state = AP_MPMQ_STOPPING; | |
| ap_close_listeners_ex(my_bucket->listeners); | |
| /* For a graceful stop, we want the child to exit when done */ | |
| die_now = 1; | |
| } | |
| /***************************************************************** | |
| * Child process main loop. | |
| * The following vars are static to avoid getting clobbered by longjmp(); | |
| * they are really private to child_main. | |
| */ | |
| static int requests_this_child; | |
| static int num_listensocks = 0; | |
| #if APR_HAS_THREADS | |
| static void child_sigmask(sigset_t *new_mask, sigset_t *old_mask) | |
| { | |
| #if defined(SIGPROCMASK_SETS_THREAD_MASK) | |
| sigprocmask(SIG_SETMASK, new_mask, old_mask); | |
| #else | |
| pthread_sigmask(SIG_SETMASK, new_mask, old_mask); | |
| #endif | |
| } | |
| #endif | |
| static void child_main(int child_num_arg, int child_bucket) | |
| { | |
| #if APR_HAS_THREADS | |
| apr_thread_t *thd = NULL; | |
| sigset_t sig_mask; | |
| #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; | |
| const char *lockfile; | |
| /* for benefit of any hooks that run as this child initializes */ | |
| retained->mpm->mpm_state = AP_MPMQ_STARTING; | |
| 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 AP_HAS_THREAD_LOCAL | |
| if (one_process) { | |
| thd = ap_thread_current(); | |
| } | |
| else if ((status = ap_thread_main_create(&thd, pchild))) { | |
| ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf, APLOGNO(10378) | |
| "Couldn't initialize child main thread"); | |
| clean_child_exit(APEXIT_CHILDFATAL); | |
| } | |
| #elif APR_HAS_THREADS | |
| { | |
| apr_os_thread_t osthd = apr_os_thread_current(); | |
| apr_os_thread_put(&thd, &osthd, pchild); | |
| } | |
| #endif | |
| #if APR_HAS_THREADS | |
| ap_assert(thd != NULL); | |
| #endif | |
| apr_pool_create(&ptrans, pchild); | |
| apr_pool_tag(ptrans, "transaction"); | |
| /* close unused listeners and pods */ | |
| for (i = 0; i < retained->mpm->num_buckets; i++) { | |
| if (i != child_bucket) { | |
| ap_close_listeners_ex(retained->buckets[i].listeners); | |
| ap_mpm_pod_close(retained->buckets[i].pod); | |
| } | |
| } | |
| /* needs to be done before we switch UIDs so we have permissions */ | |
| ap_reopen_scoreboard(pchild, NULL, 0); | |
| status = SAFE_ACCEPT(apr_proc_mutex_child_init(&my_bucket->mutex, | |
| apr_proc_mutex_lockfile(my_bucket->mutex), | |
| pchild)); | |
| if (status != APR_SUCCESS) { | |
| lockfile = apr_proc_mutex_lockfile(my_bucket->mutex); | |
| ap_log_error(APLOG_MARK, APLOG_EMERG, status, ap_server_conf, APLOGNO(00155) | |
| "Couldn't initialize cross-process lock in child " | |
| "(%s) (%s)", | |
| lockfile ? lockfile : "none", | |
| apr_proc_mutex_name(my_bucket->mutex)); | |
| clean_child_exit(APEXIT_CHILDFATAL); | |
| } | |
| if (ap_run_drop_privileges(pchild, ap_server_conf)) { | |
| clean_child_exit(APEXIT_CHILDFATAL); | |
| } | |
| #if APR_HAS_THREADS | |
| /* Save the signal mask and block all the signals from being received by | |
| * threads potentially created in child_init() hooks (e.g. mod_watchdog). | |
| */ | |
| child_sigmask(NULL, &sig_mask); | |
| { | |
| apr_status_t rv; | |
| rv = apr_setup_signal_thread(); | |
| 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 graceful-stop signal 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); | |
| } | |
| if (ap_accept_error_is_nonfatal(status)) { | |
| ap_log_error(APLOG_MARK, APLOG_DEBUG, status, ap_server_conf, | |
| "accept() on client socket failed"); | |
| } | |
| 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 (!one_process /* no POD in one_process mode */ | |
| && 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 = &retained->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 = &retained->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(retained->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; | |
| if (retained->idle_spawn_rate > MAX_SPAWN_RATE) { | |
| retained->idle_spawn_rate = MAX_SPAWN_RATE; | |
| } | |
| } | |
| } | |
| } | |
| else { | |
| retained->idle_spawn_rate = 1; | |
| } | |
| } | |
| /***************************************************************** | |
| * Executive routines. | |
| */ | |
| static int prefork_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s) | |
| { | |
| ap_listen_rec **listen_buckets = NULL; | |
| int num_buckets = retained->mpm->num_buckets; | |
| int remaining_children_to_start; | |
| apr_status_t rv; | |
| char id[16]; | |
| int i; | |
| ap_log_pid(pconf, ap_pid_fname); | |
| /* On first startup create gen_pool to satisfy the lifetime of the | |
| * parent's PODs and listeners; on restart stop the children from the | |
| * previous generation and clear gen_pool for the next one. | |
| */ | |
| if (!retained->gen_pool) { | |
| apr_pool_create(&retained->gen_pool, ap_pglobal); | |
| } | |
| else { | |
| if (retained->mpm->was_graceful) { | |
| /* kill off the idle ones */ | |
| for (i = 0; i < num_buckets; i++) { | |
| ap_mpm_pod_killpg(retained->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 (i = 0; i < ap_daemons_limit; ++i) { | |
| if (ap_scoreboard_image->servers[i][0].status != SERVER_DEAD) { | |
| ap_scoreboard_image->servers[i][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[i].pid, | |
| AP_SIG_GRACEFUL); | |
| } | |
| } | |
| } | |
| else { | |
| /* Kill 'em off. The parent is in this process group too, and | |
| * its handler would take the signal as a fresh restart request | |
| * and loop; ap_unixd_mpm_set_signals() below puts the handler | |
| * back. */ | |
| apr_signal(SIGHUP, SIG_IGN); | |
| 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); | |
| } | |
| apr_pool_clear(retained->gen_pool); | |
| retained->buckets = NULL; | |
| /* 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; | |
| } | |
| 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; | |
| } | |
| num_buckets = (one_process) ? 1 : 0; /* one_process => one bucket */ | |
| retained->idle_spawn_rate = 1; /* reset idle_spawn_rate */ | |
| } | |
| /* Now on for the new generation. */ | |
| ap_scoreboard_image->global->running_generation = retained->mpm->my_generation; | |
| ap_unixd_mpm_set_signals(pconf, one_process); | |
| if ((rv = ap_duplicate_listeners(retained->gen_pool, ap_server_conf, | |
| &listen_buckets, &num_buckets))) { | |
| ap_log_error(APLOG_MARK, APLOG_CRIT, rv, | |
| ap_server_conf, APLOGNO(03280) | |
| "could not duplicate listeners"); | |
| return !OK; | |
| } | |
| retained->buckets = apr_pcalloc(retained->gen_pool, | |
| num_buckets * sizeof(*retained->buckets)); | |
| for (i = 0; i < num_buckets; i++) { | |
| if (!one_process /* no POD in one_process mode */ | |
| && (rv = ap_mpm_pod_open(retained->gen_pool, | |
| &retained->buckets[i].pod))) { | |
| ap_log_error(APLOG_MARK, APLOG_CRIT, rv, | |
| ap_server_conf, APLOGNO(03281) | |
| "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(&retained->buckets[i].mutex, | |
| NULL, AP_ACCEPT_MUTEX_TYPE, | |
| id, s, retained->gen_pool, | |
| 0))))) { | |
| ap_log_error(APLOG_MARK, APLOG_CRIT, rv, | |
| ap_server_conf, APLOGNO(03282) | |
| "could not create accept mutex"); | |
| return !OK; | |
| } | |
| retained->buckets[i].listeners = listen_buckets[i]; | |
| } | |
| retained->mpm->num_buckets = num_buckets; | |
| /* Don't thrash since num_buckets depends on the | |
| * system and the number of online CPU cores... | |
| */ | |
| if (ap_daemons_limit < num_buckets) | |
| ap_daemons_limit = num_buckets; | |
| if (ap_daemons_to_start < num_buckets) | |
| ap_daemons_to_start = num_buckets; | |
| if (ap_daemons_min_free < num_buckets) | |
| ap_daemons_min_free = num_buckets; | |
| if (ap_daemons_max_free < ap_daemons_min_free + num_buckets) | |
| ap_daemons_max_free = ap_daemons_min_free + 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)", | |
| (retained->buckets[0].mutex) | |
| ? apr_proc_mutex_name(retained->buckets[0].mutex) | |
| : "none", | |
| apr_proc_mutex_defname()); | |
| retained->mpm->mpm_state = AP_MPMQ_RUNNING; | |
| if (one_process) { | |
| AP_MONCONTROL(1); | |
| make_child(ap_server_conf, 0); | |
| /* NOTREACHED */ | |
| ap_assert(0); | |
| return !OK; | |
| } | |
| 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 < num_buckets; i++) { | |
| ap_mpm_pod_killpg(retained->buckets[i].pod, | |
| retained->max_daemons_limit); | |
| } | |
| /* Send SIGUSR1 to the active children */ | |
| active_children = 0; | |
| for (i = 0; i < ap_daemons_limit; ++i) { | |
| if (ap_scoreboard_image->servers[i][0].status != SERVER_DEAD) { | |
| /* Ask each child to close its listeners. */ | |
| ap_mpm_safe_kill(MPM_CHILD_PID(i), 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 (i = 0; i < ap_daemons_limit; ++i) { | |
| if (ap_mpm_safe_kill(MPM_CHILD_PID(i), 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; | |
| } | |
| if (!retained->mpm->is_ungraceful) { | |
| ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00171) | |
| "Graceful restart requested, doing restart"); | |
| } | |
| else { | |
| 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; | |
| 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), APLOGNO(03279) | |
| "no listening sockets available, shutting down"); | |
| return !OK; | |
| } | |
| 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"; | |
| ap_mpm_register_extra_connection_fns(); | |
| 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->mpm->baton = retained; | |
| retained->idle_spawn_rate = 1; | |
| } | |
| else if (retained->mpm->baton != retained) { | |
| /* If the MPM changes on restart, be ungraceful */ | |
| retained->mpm->baton = retained; | |
| retained->mpm->was_graceful = 0; | |
| } | |
| retained->mpm->mpm_state = AP_MPMQ_STARTING; | |
| ++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_force_set_tz(p); | |
| 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 */ | |
| }; |