/* 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. */ /* * httpd.c: simple http daemon for answering WWW file requests * * * 03-21-93 Rob McCool wrote original code (up to NCSA HTTPd 1.3) * * 03-06-95 blong * changed server number for child-alone processes to 0 and changed name * of processes * * 03-10-95 blong * Added numerous speed hacks proposed by Robert S. Thau (rst@ai.mit.edu) * including set group before fork, and call gettime before to fork * to set up libraries. * * 04-14-95 rst / rh * Brandon's code snarfed from NCSA 1.4, but tinkered to work with the * Apache server, and also to have child processes do accept() directly. * * April-July '95 rst * Extensive rework for Apache. */ #include "apr.h" #include "apr_portable.h" #include "apr_strings.h" #include "apr_thread_proc.h" #include "apr_signal.h" #include "apr_tables.h" #include "apr_getopt.h" #include "apr_thread_mutex.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 #ifndef USE_WINSOCK #include <sys/select.h> #endif #define CORE_PRIVATE #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 "mpm_common.h" #include "ap_listen.h" #include "ap_mmn.h" #ifdef HAVE_TIME_H #include <time.h> #endif #include <signal.h> #include <netware.h> #include <nks/netware.h> #include <library.h> #include <screen.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 HARD_SERVER_LIMIT #define HARD_SERVER_LIMIT 1 #endif #define WORKER_DEAD SERVER_DEAD #define WORKER_STARTING SERVER_STARTING #define WORKER_READY SERVER_READY #define WORKER_IDLE_KILL SERVER_IDLE_KILL /* config globals */ int ap_threads_per_child=0; /* Worker threads per child */ static int ap_threads_to_start=0; static int ap_threads_min_free=0; static int ap_threads_max_free=0; static int ap_threads_limit=0; static int mpm_state = AP_MPMQ_STARTING; /* * The max child slot ever assigned, preserved across restarts. Necessary * to deal with MaxClients changes across SIGWINCH restarts. We use this * value to optimize routines that have to scan the entire scoreboard. */ int ap_max_workers_limit = -1; server_rec *ap_server_conf; /* *Non*-shared http_main globals... */ int hold_screen_on_exit = 0; /* Indicates whether the screen should be held open */ static fd_set listenfds; static int listenmaxfd; static apr_pool_t *pconf; /* Pool for config stuff */ static apr_pool_t *pmain; /* Pool for httpd child stuff */ static pid_t ap_my_pid; /* it seems silly to call getpid all the time */ static char *ap_my_addrspace = NULL; static int die_now = 0; /* Keep track of the number of worker threads currently active */ static unsigned long worker_thread_count; static int request_count; /* Structure used to register/deregister a console handler with the OS */ static int InstallConsoleHandler(void); static void RemoveConsoleHandler(void); static int CommandLineInterpreter(scr_t screenID, const char *commandLine); static CommandParser_t ConsoleHandler = {0, NULL, 0}; #define HANDLEDCOMMAND 0 #define NOTMYCOMMAND 1 static int show_settings = 0; //#define DBINFO_ON //#define DBPRINT_ON #ifdef DBPRINT_ON #define DBPRINT0(s) printf(s) #define DBPRINT1(s,v1) printf(s,v1) #define DBPRINT2(s,v1,v2) printf(s,v1,v2) #else #define DBPRINT0(s) #define DBPRINT1(s,v1) #define DBPRINT2(s,v1,v2) #endif /* volatile just in case */ static int volatile shutdown_pending; static int volatile restart_pending; static int volatile is_graceful; static int volatile wait_to_finish=1; ap_generation_t volatile ap_my_generation=0; /* a clean exit from a child with proper cleanup */ static void clean_child_exit(int code, int worker_num, apr_pool_t *ptrans, apr_bucket_alloc_t *bucket_alloc) __attribute__ ((noreturn)); static void clean_child_exit(int code, int worker_num, apr_pool_t *ptrans, apr_bucket_alloc_t *bucket_alloc) { apr_bucket_alloc_destroy(bucket_alloc); if (!shutdown_pending) { apr_pool_destroy(ptrans); } atomic_dec (&worker_thread_count); if (worker_num >=0) ap_update_child_status_from_indexes(0, worker_num, WORKER_DEAD, (request_rec *) NULL); NXThreadExit((void*)&code); } /* proper cleanup when returning from ap_mpm_run() */ static void mpm_main_cleanup(void) { if (pmain) { apr_pool_destroy(pmain); } } AP_DECLARE(apr_status_t) ap_mpm_query(int query_code, int *result) { switch(query_code){ case AP_MPMQ_MAX_DAEMON_USED: *result = 1; return APR_SUCCESS; case AP_MPMQ_IS_THREADED: *result = AP_MPMQ_DYNAMIC; return APR_SUCCESS; case AP_MPMQ_IS_FORKED: *result = AP_MPMQ_NOT_SUPPORTED; return APR_SUCCESS; case AP_MPMQ_HARD_LIMIT_DAEMONS: *result = HARD_SERVER_LIMIT; return APR_SUCCESS; case AP_MPMQ_HARD_LIMIT_THREADS: *result = HARD_THREAD_LIMIT; return APR_SUCCESS; case AP_MPMQ_MAX_THREADS: *result = ap_threads_limit; return APR_SUCCESS; case AP_MPMQ_MIN_SPARE_DAEMONS: *result = 0; return APR_SUCCESS; case AP_MPMQ_MIN_SPARE_THREADS: *result = ap_threads_min_free; return APR_SUCCESS; case AP_MPMQ_MAX_SPARE_DAEMONS: *result = 0; return APR_SUCCESS; case AP_MPMQ_MAX_SPARE_THREADS: *result = ap_threads_max_free; return APR_SUCCESS; case AP_MPMQ_MAX_REQUESTS_DAEMON: *result = ap_max_requests_per_child; return APR_SUCCESS; case AP_MPMQ_MAX_DAEMONS: *result = 1; return APR_SUCCESS; case AP_MPMQ_MPM_STATE: *result = mpm_state; return APR_SUCCESS; } return APR_ENOTIMPL; } /***************************************************************** * Connection structures and accounting... */ static void mpm_term(void) { RemoveConsoleHandler(); wait_to_finish = 0; NXThreadYield(); } static void sig_term(int sig) { if (shutdown_pending == 1) { /* Um, is this _probably_ not an error, if the user has * tried to do a shutdown twice quickly, so we won't * worry about reporting it. */ return; } shutdown_pending = 1; DBPRINT0 ("waiting for threads\n"); while (wait_to_finish) { apr_thread_yield(); } DBPRINT0 ("goodbye\n"); } /* restart() is the signal handler for SIGHUP and SIGWINCH * in the parent process, unless running in ONE_PROCESS mode */ static void restart(void) { if (restart_pending == 1) { /* Probably not an error - don't bother reporting it */ return; } restart_pending = 1; is_graceful = 1; } static void set_signals(void) { apr_signal(SIGTERM, sig_term); apr_signal(SIGABRT, sig_term); } int nlmUnloadSignaled(int wait) { shutdown_pending = 1; if (wait) { while (wait_to_finish) { NXThreadYield(); } } return 0; } /***************************************************************** * Child process main loop. * The following vars are static to avoid getting clobbered by longjmp(); * they are really private to child_main. */ int ap_graceful_stop_signalled(void) { /* not ever called anymore... */ return 0; } #define MAX_WB_RETRIES 3 #ifdef DBINFO_ON static int would_block = 0; static int retry_success = 0; static int retry_fail = 0; static int avg_retries = 0; #endif /*static */ void worker_main(void *arg) { ap_listen_rec *lr, *first_lr, *last_lr = NULL; apr_pool_t *ptrans; apr_pool_t *pbucket; apr_allocator_t *allocator; apr_bucket_alloc_t *bucket_alloc; conn_rec *current_conn; apr_status_t stat = APR_EINIT; ap_sb_handle_t *sbh; int my_worker_num = (int)arg; apr_socket_t *csd = NULL; int requests_this_child = 0; apr_socket_t *sd = NULL; fd_set main_fds; int sockdes; int srv; struct timeval tv; int wouldblock_retry; tv.tv_sec = 1; tv.tv_usec = 0; apr_allocator_create(&allocator); apr_allocator_max_free_set(allocator, ap_max_mem_free); apr_pool_create_ex(&ptrans, pmain, NULL, allocator); apr_allocator_owner_set(allocator, ptrans); apr_pool_tag(ptrans, "transaction"); bucket_alloc = apr_bucket_alloc_create_ex(allocator); atomic_inc (&worker_thread_count); while (!die_now) { /* * (Re)initialize this child to a pre-connection state. */ current_conn = NULL; apr_pool_clear(ptrans); if ((ap_max_requests_per_child > 0 && requests_this_child++ >= ap_max_requests_per_child)) { DBPRINT1 ("\n**Thread slot %d is shutting down", my_worker_num); clean_child_exit(0, my_worker_num, ptrans, bucket_alloc); } ap_update_child_status_from_indexes(0, my_worker_num, WORKER_READY, (request_rec *) NULL); /* * Wait for an acceptable connection to arrive. */ for (;;) { if (shutdown_pending || restart_pending || (ap_scoreboard_image->servers[0][my_worker_num].status == WORKER_IDLE_KILL)) { DBPRINT1 ("\nThread slot %d is shutting down\n", my_worker_num); clean_child_exit(0, my_worker_num, ptrans, bucket_alloc); } /* Check the listen queue on all sockets for requests */ memcpy(&main_fds, &listenfds, sizeof(fd_set)); srv = select(listenmaxfd + 1, &main_fds, NULL, NULL, &tv); if (srv <= 0) { if (srv < 0) { ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, "select() failed on listen socket"); apr_thread_yield(); } continue; } /* remember the last_lr we searched last time around so that we don't end up starving any particular listening socket */ if (last_lr == NULL) { lr = ap_listeners; } else { lr = last_lr->next; if (!lr) lr = ap_listeners; } first_lr = lr; do { apr_os_sock_get(&sockdes, lr->sd); if (FD_ISSET(sockdes, &main_fds)) goto got_listener; lr = lr->next; if (!lr) lr = ap_listeners; } while (lr != first_lr); /* if we get here, something unexpected happened. Go back into the select state and try again. */ continue; got_listener: last_lr = lr; sd = lr->sd; wouldblock_retry = MAX_WB_RETRIES; while (wouldblock_retry) { if ((stat = apr_socket_accept(&csd, sd, ptrans)) == APR_SUCCESS) { break; } else { /* if the error is a wouldblock then maybe we were too quick try to pull the next request from the listen queue. Try a few more times then return to our idle listen state. */ if (!APR_STATUS_IS_EAGAIN(stat)) { break; } if (wouldblock_retry--) { apr_thread_yield(); } } } /* If we got a new socket, set it to non-blocking mode and process it. Otherwise handle the error. */ if (stat == APR_SUCCESS) { apr_socket_opt_set(csd, APR_SO_NONBLOCK, 0); #ifdef DBINFO_ON if (wouldblock_retry < MAX_WB_RETRIES) { retry_success++; avg_retries += (MAX_WB_RETRIES-wouldblock_retry); } #endif break; /* We have a socket ready for reading */ } else { #ifdef DBINFO_ON if (APR_STATUS_IS_EAGAIN(stat)) { would_block++; retry_fail++; } else if ( #else if (APR_STATUS_IS_EAGAIN(stat) || #endif APR_STATUS_IS_ECONNRESET(stat) || APR_STATUS_IS_ETIMEDOUT(stat) || APR_STATUS_IS_EHOSTUNREACH(stat) || APR_STATUS_IS_ENETUNREACH(stat)) { ; } #ifdef USE_WINSOCK else if (APR_STATUS_IS_ENETDOWN(stat)) { /* * When the network layer has been shut down, there * is not much use in simply exiting: the parent * would simply re-create us (and we'd fail again). * Use the CHILDFATAL code to tear the server down. * @@@ Martin's idea for possible improvement: * A different approach would be to define * a new APEXIT_NETDOWN exit code, the reception * of which would make the parent shutdown all * children, then idle-loop until it detected that * the network is up again, and restart the children. * Ben Hyde noted that temporary ENETDOWN situations * occur in mobile IP. */ ap_log_error(APLOG_MARK, APLOG_EMERG, stat, ap_server_conf, "apr_socket_accept: giving up."); clean_child_exit(APEXIT_CHILDFATAL, my_worker_num, ptrans, bucket_alloc); } #endif else { ap_log_error(APLOG_MARK, APLOG_ERR, stat, ap_server_conf, "apr_socket_accept: (client socket)"); clean_child_exit(1, my_worker_num, ptrans, bucket_alloc); } } } ap_create_sb_handle(&sbh, ptrans, 0, my_worker_num); /* * 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_worker_num, sbh, bucket_alloc); if (current_conn) { ap_process_connection(current_conn, csd); ap_lingering_close(current_conn); } request_count++; } clean_child_exit(0, my_worker_num, ptrans, bucket_alloc); } static int make_child(server_rec *s, int slot) { int tid; int err=0; NXContext_t ctx; if (slot + 1 > ap_max_workers_limit) { ap_max_workers_limit = slot + 1; } ap_update_child_status_from_indexes(0, slot, WORKER_STARTING, (request_rec *) NULL); if (ctx = NXContextAlloc((void (*)(void *)) worker_main, (void*)slot, NX_PRIO_MED, ap_thread_stacksize, NX_CTX_NORMAL, &err)) { char threadName[32]; sprintf (threadName, "Apache_Worker %d", slot); NXContextSetName(ctx, threadName); err = NXThreadCreate(ctx, NX_THR_BIND_CONTEXT, &tid); if (err) { NXContextFree (ctx); } } if (err) { /* create thread didn't succeed. Fix the scoreboard or else * it will say SERVER_STARTING forever and ever */ ap_update_child_status_from_indexes(0, slot, WORKER_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. */ apr_thread_yield(); return -1; } ap_scoreboard_image->servers[0][slot].tid = tid; return 0; } /* start up a bunch of worker threads */ static void startup_workers(int number_to_start) { int i; for (i = 0; number_to_start && i < ap_threads_limit; ++i) { if (ap_scoreboard_image->servers[0][i].status != WORKER_DEAD) { continue; } if (make_child(ap_server_conf, i) < 0) { break; } --number_to_start; } } /* * idle_spawn_rate is the number of children that will be spawned on the * next maintenance cycle if there aren't enough idle servers. It is * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by * without the need to spawn. */ static int idle_spawn_rate = 1; #ifndef MAX_SPAWN_RATE #define MAX_SPAWN_RATE (64) #endif static int hold_off_on_exponential_spawning; static void perform_idle_server_maintenance(apr_pool_t *p) { int i; int to_kill; int idle_count; worker_score *ws; int free_length; int free_slots[MAX_SPAWN_RATE]; int last_non_dead; int total_non_dead; /* initialize the free_list */ free_length = 0; to_kill = -1; idle_count = 0; last_non_dead = -1; total_non_dead = 0; for (i = 0; i < ap_threads_limit; ++i) { int status; if (i >= ap_max_workers_limit && free_length == idle_spawn_rate) break; ws = &ap_scoreboard_image->servers[0][i]; status = ws->status; if (status == WORKER_DEAD) { /* try to keep children numbers as low as possible */ if (free_length < idle_spawn_rate) { free_slots[free_length] = i; ++free_length; } } else if (status == WORKER_IDLE_KILL) { /* If it is already marked to die, skip it */ continue; } 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 <= WORKER_READY) { ++ idle_count; /* always kill the highest numbered child if we have to... * no really well thought out reason ... other than observing * the server behaviour under linux where lower numbered children * tend to service more hits (and hence are more likely to have * their data in cpu caches). */ to_kill = i; } ++total_non_dead; last_non_dead = i; } } DBPRINT2("Total: %d Idle Count: %d \r", total_non_dead, idle_count); ap_max_workers_limit = last_non_dead + 1; if (idle_count > ap_threads_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 */ idle_spawn_rate = 1; ap_update_child_status_from_indexes(0, last_non_dead, WORKER_IDLE_KILL, (request_rec *) NULL); DBPRINT1("\nKilling idle thread: %d\n", last_non_dead); } else if (idle_count < ap_threads_min_free) { /* terminate the free list */ if (free_length == 0) { /* only report this condition once */ static int reported = 0; if (!reported) { ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, "server reached MaxClients setting, consider" " raising the MaxClients setting"); reported = 1; } idle_spawn_rate = 1; } else { if (idle_spawn_rate >= 8) { ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, "server seems busy, (you may need " "to increase StartServers, or Min/MaxSpareServers), " "spawning %d children, there are %d idle, and " "%d total children", idle_spawn_rate, idle_count, total_non_dead); } DBPRINT0("\n"); for (i = 0; i < free_length; ++i) { DBPRINT1("Spawning additional thread slot: %d\n", free_slots[i]); make_child(ap_server_conf, free_slots[i]); } /* the next time around we want to spawn twice as many if this * wasn't good enough, but not if we've just done a graceful */ if (hold_off_on_exponential_spawning) { --hold_off_on_exponential_spawning; } else if (idle_spawn_rate < MAX_SPAWN_RATE) { idle_spawn_rate *= 2; } } } else { idle_spawn_rate = 1; } } static void display_settings () { int status_array[SERVER_NUM_STATUS]; int i, status, total=0; int reqs = request_count; #ifdef DBINFO_ON int wblock = would_block; would_block = 0; #endif request_count = 0; ClearScreen (getscreenhandle()); printf("%s \n", ap_get_server_description()); for (i=0;i<SERVER_NUM_STATUS;i++) { status_array[i] = 0; } for (i = 0; i < ap_threads_limit; ++i) { status = (ap_scoreboard_image->servers[0][i]).status; status_array[status]++; } for (i=0;i<SERVER_NUM_STATUS;i++) { switch(i) { case SERVER_DEAD: printf ("Available:\t%d\n", status_array[i]); break; case SERVER_STARTING: printf ("Starting:\t%d\n", status_array[i]); break; case SERVER_READY: printf ("Ready:\t\t%d\n", status_array[i]); break; case SERVER_BUSY_READ: printf ("Busy:\t\t%d\n", status_array[i]); break; case SERVER_BUSY_WRITE: printf ("Busy Write:\t%d\n", status_array[i]); break; case SERVER_BUSY_KEEPALIVE: printf ("Busy Keepalive:\t%d\n", status_array[i]); break; case SERVER_BUSY_LOG: printf ("Busy Log:\t%d\n", status_array[i]); break; case SERVER_BUSY_DNS: printf ("Busy DNS:\t%d\n", status_array[i]); break; case SERVER_CLOSING: printf ("Closing:\t%d\n", status_array[i]); break; case SERVER_GRACEFUL: printf ("Restart:\t%d\n", status_array[i]); break; case SERVER_IDLE_KILL: printf ("Idle Kill:\t%d\n", status_array[i]); break; default: printf ("Unknown Status:\t%d\n", status_array[i]); break; } if (i != SERVER_DEAD) total+=status_array[i]; } printf ("Total Running:\t%d\tout of: \t%d\n", total, ap_threads_limit); printf ("Requests per interval:\t%d\n", reqs); #ifdef DBINFO_ON printf ("Would blocks:\t%d\n", wblock); printf ("Successful retries:\t%d\n", retry_success); printf ("Failed retries:\t%d\n", retry_fail); printf ("Avg retries:\t%d\n", retry_success == 0 ? 0 : avg_retries / retry_success); #endif } static void show_server_data() { ap_listen_rec *lr; module **m; printf("%s\n", ap_get_server_description()); if (ap_my_addrspace && (ap_my_addrspace[0] != 'O') && (ap_my_addrspace[1] != 'S')) printf(" Running in address space %s\n", ap_my_addrspace); /* Display listening ports */ printf(" Listening on port(s):"); lr = ap_listeners; do { printf(" %d", lr->bind_addr->port); lr = lr->next; } while(lr && lr != ap_listeners); /* Display dynamic modules loaded */ printf("\n"); for (m = ap_loaded_modules; *m != NULL; m++) { if (((module*)*m)->dynamic_load_handle) { printf(" Loaded dynamic module %s\n", ((module*)*m)->name); } } } static int setup_listeners(server_rec *s) { ap_listen_rec *lr; int sockdes; if (ap_setup_listeners(s) < 1 ) { ap_log_error(APLOG_MARK, APLOG_ALERT, 0, s, "no listening sockets available, shutting down"); return -1; } listenmaxfd = -1; FD_ZERO(&listenfds); for (lr = ap_listeners; lr; lr = lr->next) { apr_os_sock_get(&sockdes, lr->sd); FD_SET(sockdes, &listenfds); if (sockdes > listenmaxfd) { listenmaxfd = sockdes; } } return 0; } static int shutdown_listeners() { ap_listen_rec *lr; for (lr = ap_listeners; lr; lr = lr->next) { apr_socket_close(lr->sd); } ap_listeners = NULL; return 0; } /***************************************************************** * Executive routines. */ int ap_mpm_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s) { apr_status_t status=0; pconf = _pconf; ap_server_conf = s; if (setup_listeners(s)) { ap_log_error(APLOG_MARK, APLOG_ALERT, status, s, "no listening sockets available, shutting down"); return -1; } restart_pending = shutdown_pending = 0; worker_thread_count = 0; if (!is_graceful) { if (ap_run_pre_mpm(s->process->pool, SB_NOT_SHARED) != OK) { return 1; } } /* Only set slot 0 since that is all NetWare will ever have. */ ap_scoreboard_image->parent[0].pid = getpid(); set_signals(); apr_pool_create(&pmain, pconf); ap_run_child_init(pmain, ap_server_conf); if (ap_threads_max_free < ap_threads_min_free + 1) /* Don't thrash... */ ap_threads_max_free = ap_threads_min_free + 1; request_count = 0; startup_workers(ap_threads_to_start); /* Allow the Apache screen to be closed normally on exit() only if it has not been explicitly forced to close on exit(). (ie. the -E flag was specified at startup) */ if (hold_screen_on_exit > 0) { hold_screen_on_exit = 0; } ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, "%s configured -- resuming normal operations", ap_get_server_description()); ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, "Server built: %s", ap_get_server_built()); #ifdef AP_MPM_WANT_SET_ACCEPT_LOCK_MECH ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, "AcceptMutex: %s (default: %s)", apr_proc_mutex_name(accept_mutex), apr_proc_mutex_defname()); #endif show_server_data(); mpm_state = AP_MPMQ_RUNNING; while (!restart_pending && !shutdown_pending) { perform_idle_server_maintenance(pconf); if (show_settings) display_settings(); apr_thread_yield(); apr_sleep(SCOREBOARD_MAINTENANCE_INTERVAL); } mpm_state = AP_MPMQ_STOPPING; /* Shutdown the listen sockets so that we don't get stuck in a blocking call. shutdown_listeners();*/ if (shutdown_pending) { /* Got an unload from the console */ ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, "caught SIGTERM, shutting down"); while (worker_thread_count > 0) { printf ("\rShutdown pending. Waiting for %d thread(s) to terminate...", worker_thread_count); apr_thread_yield(); } mpm_main_cleanup(); return 1; } else { /* the only other way out is a restart */ /* 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. */ ++ap_my_generation; ap_scoreboard_image->global->running_generation = ap_my_generation; ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, "Graceful restart requested, doing restart"); /* Wait for all of the threads to terminate before initiating the restart */ while (worker_thread_count > 0) { printf ("\rRestart pending. Waiting for %d thread(s) to terminate...", worker_thread_count); apr_thread_yield(); } printf ("\nRestarting...\n"); } mpm_main_cleanup(); return 0; } static int netware_pre_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp) { int debug; char *addrname = NULL; mpm_state = AP_MPMQ_STARTING; debug = ap_exists_config_define("DEBUG"); is_graceful = 0; ap_my_pid = getpid(); addrname = getaddressspacename (NULL, NULL); if (addrname) { ap_my_addrspace = apr_pstrdup (p, addrname); free (addrname); } #ifndef USE_WINSOCK /* The following call has been moved to the mod_nw_ssl pre-config handler */ ap_listen_pre_config(); #endif ap_threads_to_start = DEFAULT_START_THREADS; ap_threads_min_free = DEFAULT_MIN_FREE_THREADS; ap_threads_max_free = DEFAULT_MAX_FREE_THREADS; ap_threads_limit = HARD_THREAD_LIMIT; ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD; ap_extended_status = 0; ap_thread_stacksize = DEFAULT_THREAD_STACKSIZE; #ifdef AP_MPM_WANT_SET_MAX_MEM_FREE ap_max_mem_free = APR_ALLOCATOR_MAX_FREE_UNLIMITED; #endif return OK; } static void netware_mpm_hooks(apr_pool_t *p) { ap_hook_pre_config(netware_pre_config, NULL, NULL, APR_HOOK_MIDDLE); } void netware_rewrite_args(process_rec *process) { char *def_server_root; char optbuf[3]; const char *opt_arg; apr_getopt_t *opt; apr_array_header_t *mpm_new_argv; atexit (mpm_term); InstallConsoleHandler(); /* Make sure to hold the Apache screen open if exit() is called */ hold_screen_on_exit = 1; /* Rewrite process->argv[]; * * add default -d serverroot from the path of this executable * * The end result will look like: * The -d serverroot default from the running executable */ if (process->argc > 0) { char *s = apr_pstrdup (process->pconf, process->argv[0]); if (s) { int i, len = strlen(s); for (i=len; i; i--) { if (s[i] == '\\' || s[i] == '/') { s[i] = '\0'; apr_filepath_merge(&def_server_root, NULL, s, APR_FILEPATH_TRUENAME, process->pool); break; } } /* Use process->pool so that the rewritten argv * lasts for the lifetime of the server process, * because pconf will be destroyed after the * initial pre-flight of the config parser. */ mpm_new_argv = apr_array_make(process->pool, process->argc + 2, sizeof(const char *)); *(const char **)apr_array_push(mpm_new_argv) = process->argv[0]; *(const char **)apr_array_push(mpm_new_argv) = "-d"; *(const char **)apr_array_push(mpm_new_argv) = def_server_root; optbuf[0] = '-'; optbuf[2] = '\0'; apr_getopt_init(&opt, process->pool, process->argc, (char**) process->argv); while (apr_getopt(opt, AP_SERVER_BASEARGS"n:", optbuf + 1, &opt_arg) == APR_SUCCESS) { switch (optbuf[1]) { case 'n': if (opt_arg) { renamescreen(opt_arg); } break; case 'E': /* Don't need to hold the screen open if the output is going to a file */ hold_screen_on_exit = -1; default: *(const char **)apr_array_push(mpm_new_argv) = apr_pstrdup(process->pool, optbuf); if (opt_arg) { *(const char **)apr_array_push(mpm_new_argv) = opt_arg; } break; } } process->argc = mpm_new_argv->nelts; process->argv = (const char * const *) mpm_new_argv->elts; } } } static int CommandLineInterpreter(scr_t screenID, const char *commandLine) { char *szCommand = "APACHE2 "; int iCommandLen = 8; char szcommandLine[256]; char *pID; screenID = screenID; if (commandLine == NULL) return NOTMYCOMMAND; if (strlen(commandLine) <= strlen(szCommand)) return NOTMYCOMMAND; strncpy (szcommandLine, commandLine, sizeof(szcommandLine)-1); /* All added commands begin with "APACHE2 " */ if (!strnicmp(szCommand, szcommandLine, iCommandLen)) { ActivateScreen (getscreenhandle()); /* If an instance id was not given but the nlm is loaded in protected space, then the the command belongs to the OS address space instance to pass it on. */ pID = strstr (szcommandLine, "-p"); if ((pID == NULL) && nlmisloadedprotected()) return NOTMYCOMMAND; /* If we got an instance id but it doesn't match this instance of the nlm, pass it on. */ if (pID) { pID = &pID[2]; while (*pID && (*pID == ' ')) pID++; } if (pID && ap_my_addrspace && strnicmp(pID, ap_my_addrspace, strlen(ap_my_addrspace))) return NOTMYCOMMAND; /* If we have determined that this command belongs to this instance of the nlm, then handle it. */ if (!strnicmp("RESTART",&szcommandLine[iCommandLen],3)) { printf("Restart Requested...\n"); restart(); } else if (!strnicmp("VERSION",&szcommandLine[iCommandLen],3)) { printf("Server version: %s\n", ap_get_server_description()); printf("Server built: %s\n", ap_get_server_built()); } else if (!strnicmp("MODULES",&szcommandLine[iCommandLen],3)) { ap_show_modules(); } else if (!strnicmp("DIRECTIVES",&szcommandLine[iCommandLen],3)) { ap_show_directives(); } else if (!strnicmp("SHUTDOWN",&szcommandLine[iCommandLen],3)) { printf("Shutdown Requested...\n"); shutdown_pending = 1; } else if (!strnicmp("SETTINGS",&szcommandLine[iCommandLen],3)) { if (show_settings) { show_settings = 0; ClearScreen (getscreenhandle()); show_server_data(); } else { show_settings = 1; display_settings(); } } else { show_settings = 0; if (strnicmp("HELP",&szcommandLine[iCommandLen],3)) printf("Unknown APACHE2 command %s\n", &szcommandLine[iCommandLen]); printf("Usage: APACHE2 [command] [-p <instance ID>]\n"); printf("Commands:\n"); printf("\tDIRECTIVES - Show directives\n"); printf("\tHELP - Display this help information\n"); printf("\tMODULES - Show a list of the loaded modules\n"); printf("\tRESTART - Reread the configuration file and restart Apache\n"); printf("\tSETTINGS - Show current thread status\n"); printf("\tSHUTDOWN - Shutdown Apache\n"); printf("\tVERSION - Display the server version information\n"); } /* Tell NetWare we handled the command */ return HANDLEDCOMMAND; } /* Tell NetWare that the command isn't mine */ return NOTMYCOMMAND; } static int InstallConsoleHandler(void) { /* Our command line handler interfaces the system operator with this NLM */ NX_WRAP_INTERFACE(CommandLineInterpreter, 2, (void*)&(ConsoleHandler.parser)); ConsoleHandler.rTag = AllocateResourceTag(getnlmhandle(), "Command Line Processor", ConsoleCommandSignature); if (!ConsoleHandler.rTag) { printf("Error on allocate resource tag\n"); return 1; } RegisterConsoleCommand(&ConsoleHandler); /* The Remove procedure unregisters the console handler */ return 0; } static void RemoveConsoleHandler(void) { UnRegisterConsoleCommand(&ConsoleHandler); NX_UNWRAP_INTERFACE(ConsoleHandler.parser); } static const char *set_threads_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_threads_to_start = atoi(arg); return NULL; } static const char *set_min_free_threads(cmd_parms *cmd, void *dummy, const char *arg) { const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); if (err != NULL) { return err; } ap_threads_min_free = atoi(arg); if (ap_threads_min_free <= 0) { ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "WARNING: detected MinSpareServers set to non-positive."); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "Resetting to 1 to avoid almost certain Apache failure."); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "Please read the documentation."); ap_threads_min_free = 1; } return NULL; } static const char *set_max_free_threads(cmd_parms *cmd, void *dummy, const char *arg) { const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); if (err != NULL) { return err; } ap_threads_max_free = atoi(arg); return NULL; } static const char *set_thread_limit (cmd_parms *cmd, void *dummy, const char *arg) { const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); if (err != NULL) { return err; } ap_threads_limit = atoi(arg); if (ap_threads_limit > HARD_THREAD_LIMIT) { ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "WARNING: MaxThreads of %d exceeds compile time limit " "of %d threads,", ap_threads_limit, HARD_THREAD_LIMIT); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, " lowering MaxThreads to %d. To increase, please " "see the", HARD_THREAD_LIMIT); ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, " HARD_THREAD_LIMIT define in %s.", AP_MPM_HARD_LIMITS_FILE); ap_threads_limit = HARD_THREAD_LIMIT; } else if (ap_threads_limit < 1) { ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "WARNING: Require MaxThreads > 0, setting to 1"); ap_threads_limit = 1; } return NULL; } static const command_rec netware_mpm_cmds[] = { LISTEN_COMMANDS, AP_INIT_TAKE1("StartThreads", set_threads_to_start, NULL, RSRC_CONF, "Number of worker threads launched at server startup"), AP_INIT_TAKE1("MinSpareThreads", set_min_free_threads, NULL, RSRC_CONF, "Minimum number of idle threads, to handle request spikes"), AP_INIT_TAKE1("MaxSpareThreads", set_max_free_threads, NULL, RSRC_CONF, "Maximum number of idle threads"), AP_INIT_TAKE1("MaxThreads", set_thread_limit, NULL, RSRC_CONF, "Maximum number of worker threads alive at the same time"), { NULL } }; module AP_MODULE_DECLARE_DATA mpm_netware_module = { MPM20_MODULE_STUFF, netware_rewrite_args, /* 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 */ netware_mpm_cmds, /* command apr_table_t */ netware_mpm_hooks, /* register hooks */ };
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