| /* 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; |
| |
| /* 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; |
| |
| 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; |
| |
| 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 *all_buckets, /* All listeners buckets */ |
| *my_bucket; /* Current child bucket */ |
| |
| #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_scoreboard_image->parent[slot].pid = pid; |
| ap_run_child_status(ap_server_conf, |
| ap_scoreboard_image->parent[slot].pid, |
| retained->mpm->my_generation, slot, MPM_CHILD_STARTED); |
| } |
| |
| /* 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) |
| { |
| retained->mpm->mpm_state = AP_MPMQ_STOPPING; |
| |
| apr_signal(SIGHUP, SIG_IGN); |
| apr_signal(SIGTERM, SIG_IGN); |
| |
| if (pchild) { |
| apr_pool_destroy(pchild); |
| } |
| |
| if (one_process) { |
| prefork_note_child_killed(/* slot */ 0, 0, 0); |
| } |
| |
| ap_mpm_pod_close(my_bucket->pod); |
| chdir_for_gprof(); |
| exit(code); |
| } |
| |
| 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(0); |
| } |
| |
| /* 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; |
| |
| static void child_main(int child_num_arg, int child_bucket) |
| { |
| #if APR_HAS_THREADS |
| apr_thread_t *thd = NULL; |
| apr_os_thread_t osthd; |
| #endif |
| apr_pool_t *ptrans; |
| apr_allocator_t *allocator; |
| apr_status_t status; |
| int i; |
| ap_listen_rec *lr; |
| apr_pollset_t *pollset; |
| ap_sb_handle_t *sbh; |
| apr_bucket_alloc_t *bucket_alloc; |
| int last_poll_idx = 0; |
| 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 APR_HAS_THREADS |
| osthd = apr_os_thread_current(); |
| apr_os_thread_put(&thd, &osthd, pchild); |
| #endif |
| |
| apr_pool_create(&ptrans, pchild); |
| apr_pool_tag(ptrans, "transaction"); |
| |
| /* close unused listeners and pods */ |
| for (i = 0; i < retained->mpm->num_buckets; i++) { |
| if (i != child_bucket) { |
| ap_close_listeners_ex(all_buckets[i].listeners); |
| ap_mpm_pod_close(all_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); |
| } |
| |
| ap_run_child_init(pchild, ap_server_conf); |
| |
| ap_create_sb_handle(&sbh, pchild, my_child_num, 0); |
| |
| (void) ap_update_child_status(sbh, SERVER_READY, (request_rec *) NULL); |
| |
| /* Set up the pollfd array */ |
| status = apr_pollset_create(&pollset, num_listensocks, pchild, |
| 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) |
| { |
| 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) { |
| 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-condition in signals |
| * handling when httpd is runnning 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); |
| } |
| |
| ap_scoreboard_image->parent[slot].bucket = 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, i % retained->mpm->num_buckets) < 0) { |
| break; |
| } |
| --number_to_start; |
| } |
| } |
| |
| static void perform_idle_server_maintenance(apr_pool_t *p) |
| { |
| static int bucket_make_child_record = -1; |
| static int bucket_kill_child_record = -1; |
| 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) { |
| /* 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) { |
| bucket_make_child_record++; |
| bucket_make_child_record %= retained->mpm->num_buckets; |
| make_child(ap_server_conf, free_slots[i], |
| bucket_make_child_record); |
| } |
| /* 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; |
| } |
| |
| if (!one_process) { |
| ap_fatal_signal_setup(ap_server_conf, pconf); |
| } |
| ap_unixd_mpm_set_signals(pconf, one_process); |
| |
| if (one_process) { |
| AP_MONCONTROL(1); |
| make_child(ap_server_conf, 0, 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, |
| ap_get_scoreboard_process(child_slot)->bucket); |
| --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), APLOGNO(03279) |
| "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), APLOGNO(03280) |
| "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), 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(&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), APLOGNO(03282) |
| "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->max_daemons_limit = -1; |
| 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, 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 */ |
| }; |
