1 /* ====================================================================
2 * The Apache Software License, Version 1.1
4 * Copyright (c) 2000 The Apache Software Foundation. All rights
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * 3. The end-user documentation included with the redistribution,
20 * if any, must include the following acknowledgment:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowledgment may appear in the software itself,
24 * if and wherever such third-party acknowledgments normally appear.
26 * 4. The names "Apache" and "Apache Software Foundation" must
27 * not be used to endorse or promote products derived from this
28 * software without prior written permission. For written
29 * permission, please contact apache@apache.org.
31 * 5. Products derived from this software may not be called "Apache",
32 * nor may "Apache" appear in their name, without prior written
33 * permission of the Apache Software Foundation.
35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47 * ====================================================================
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Software Foundation. For more
51 * information on the Apache Software Foundation, please see
52 * <http://www.apache.org/>.
54 * Portions of this software are based upon public domain software
55 * originally written at the National Center for Supercomputing Applications,
56 * University of Illinois, Urbana-Champaign.
61 #include "ap_config.h"
63 #include "apr_strings.h"
64 #include "apr_portable.h"
65 #include "apr_file_io.h"
67 #include "http_main.h"
69 #include "http_config.h" /* for read_config */
70 #include "http_core.h" /* for get_remote_host */
71 #include "http_protocol.h"
72 #include "http_connection.h"
75 #include "mpm_common.h"
77 #include "ap_listen.h"
78 #include "mpm_default.h"
80 #include "scoreboard.h"
86 #ifdef HAVE_SYS_SOCKET_H
87 #include <sys/socket.h>
89 #ifdef HAVE_NETINET_TCP_H
90 #include <netinet/tcp.h>
100 * Actual definitions of config globals
103 static int threads_to_start = 0; /* Worker threads per child */
104 static int min_spare_threads = 0;
105 static int max_spare_threads = 0;
106 static int max_threads = 0;
107 static int max_requests_per_child = 0;
108 static const char *ap_pid_fname=NULL;
109 API_VAR_EXPORT const char *ap_scoreboard_fname=NULL;
110 static int num_daemons=0;
111 static int workers_may_exit = 0;
112 static int requests_this_child;
113 static int num_listenfds = 0;
114 static ap_socket_t **listenfds;
116 struct child_info_t {
121 struct socket_info_t {
122 const char *sname; /* The servername */
123 int cnum; /* The child number */
127 const char *sockname;
128 } perchild_server_conf;
130 typedef struct child_info_t child_info_t;
131 typedef struct socket_info_t socket_info_t;
133 /* Tables used to determine the user and group each child process should
134 * run as. The hash table is used to correlate a server name with a child
137 static child_info_t child_info_table[HARD_SERVER_LIMIT];
138 static ap_hash_t *socket_info_table;
141 struct ap_ctable ap_child_table[HARD_SERVER_LIMIT];
144 * The max child slot ever assigned, preserved across restarts. Necessary
145 * to deal with NumServers changes across SIGWINCH restarts. We use this
146 * value to optimize routines that have to scan the entire child table.
148 * XXX - It might not be worth keeping this code in. There aren't very
149 * many child processes in this MPM.
151 int ap_max_daemons_limit = -1;
153 char ap_coredump_dir[MAX_STRING_LEN];
155 module MODULE_VAR_EXPORT mpm_perchild_module;
157 static ap_file_t *pipe_of_death_in = NULL;
158 static ap_file_t *pipe_of_death_out = NULL;
159 static pthread_mutex_t pipe_of_death_mutex;
161 /* *Non*-shared http_main globals... */
163 server_rec *ap_server_conf;
165 /* one_process --- debugging mode variable; can be set from the command line
166 * with the -X flag. If set, this gets you the child_main loop running
167 * in the process which originally started up (no detach, no make_child),
168 * which is a pretty nice debugging environment. (You'll get a SIGHUP
169 * early in standalone_main; just continue through. This is the server
170 * trying to kill off any child processes which it might have lying
171 * around --- Apache doesn't keep track of their pids, it just sends
172 * SIGHUP to the process group, ignoring it in the root process.
173 * Continue through and you'll be fine.).
176 static int one_process = 0;
179 int raise_sigstop_flags;
182 static ap_pool_t *pconf; /* Pool for config stuff */
183 static ap_pool_t *pchild; /* Pool for httpd child stuff */
184 static ap_pool_t *thread_pool_parent; /* Parent of per-thread pools */
185 static pthread_mutex_t thread_pool_parent_mutex;
187 static int child_num;
188 static unsigned int my_pid; /* Linux getpid() doesn't work except in
189 main thread. Use this instead */
190 /* Keep track of the number of worker threads currently active */
191 static int worker_thread_count;
192 static pthread_mutex_t worker_thread_count_mutex;
193 static int worker_thread_free_ids[HARD_THREAD_LIMIT];
194 static pthread_attr_t worker_thread_attr;
196 /* Keep track of the number of idle worker threads */
197 static int idle_thread_count;
198 static pthread_mutex_t idle_thread_count_mutex;
200 /* Locks for accept serialization */
201 #ifdef NO_SERIALIZED_ACCEPT
202 #define SAFE_ACCEPT(stmt) APR_SUCCESS
204 #define SAFE_ACCEPT(stmt) (stmt)
205 static ap_lock_t *process_accept_mutex;
206 #endif /* NO_SERIALIZED_ACCEPT */
207 static const char *lock_fname;
208 static pthread_mutex_t thread_accept_mutex = PTHREAD_MUTEX_INITIALIZER;
210 API_EXPORT(int) ap_get_max_daemons(void)
212 return ap_max_daemons_limit;
215 /* a clean exit from a child with proper cleanup */
216 static void clean_child_exit(int code)
219 ap_destroy_pool(pchild);
224 /* handle all varieties of core dumping signals */
225 static void sig_coredump(int sig)
227 chdir(ap_coredump_dir);
228 ap_signal(sig, SIG_DFL);
230 /* At this point we've got sig blocked, because we're still inside
231 * the signal handler. When we leave the signal handler it will
232 * be unblocked, and we'll take the signal... and coredump or whatever
233 * is appropriate for this particular Unix. In addition the parent
234 * will see the real signal we received -- whereas if we called
235 * abort() here, the parent would only see SIGABRT.
239 static void just_die(int sig)
244 /*****************************************************************
245 * Connection structures and accounting...
248 /* volatile just in case */
249 static int volatile shutdown_pending;
250 static int volatile restart_pending;
251 static int volatile is_graceful;
254 * ap_start_shutdown() and ap_start_restart(), below, are a first stab at
255 * functions to initiate shutdown or restart without relying on signals.
256 * Previously this was initiated in sig_term() and restart() signal handlers,
257 * but we want to be able to start a shutdown/restart from other sources --
258 * e.g. on Win32, from the service manager. Now the service manager can
259 * call ap_start_shutdown() or ap_start_restart() as appropiate. Note that
260 * these functions can also be called by the child processes, since global
261 * variables are no longer used to pass on the required action to the parent.
263 * These should only be called from the parent process itself, since the
264 * parent process will use the shutdown_pending and restart_pending variables
265 * to determine whether to shutdown or restart. The child process should
266 * call signal_parent() directly to tell the parent to die -- this will
267 * cause neither of those variable to be set, which the parent will
268 * assume means something serious is wrong (which it will be, for the
269 * child to force an exit) and so do an exit anyway.
272 void ap_start_shutdown(void)
274 if (shutdown_pending == 1) {
275 /* Um, is this _probably_ not an error, if the user has
276 * tried to do a shutdown twice quickly, so we won't
277 * worry about reporting it.
281 shutdown_pending = 1;
284 /* do a graceful restart if graceful == 1 */
285 static void ap_start_restart(int graceful)
288 if (restart_pending == 1) {
289 /* Probably not an error - don't bother reporting it */
293 is_graceful = graceful;
295 ap_kill_cleanup(pconf, NULL, ap_cleanup_shared_mem);
299 static void sig_term(int sig)
304 static void restart(int sig)
307 ap_start_restart(sig == SIGWINCH);
313 static void set_signals(void)
315 #ifndef NO_USE_SIGACTION
318 sigemptyset(&sa.sa_mask);
322 sa.sa_handler = sig_coredump;
323 #if defined(SA_ONESHOT)
324 sa.sa_flags = SA_ONESHOT;
325 #elif defined(SA_RESETHAND)
326 sa.sa_flags = SA_RESETHAND;
328 if (sigaction(SIGSEGV, &sa, NULL) < 0)
329 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGSEGV)");
331 if (sigaction(SIGBUS, &sa, NULL) < 0)
332 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGBUS)");
335 if (sigaction(SIGABORT, &sa, NULL) < 0)
336 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABORT)");
339 if (sigaction(SIGABRT, &sa, NULL) < 0)
340 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABRT)");
343 if (sigaction(SIGILL, &sa, NULL) < 0)
344 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGILL)");
348 sa.sa_handler = sig_term;
349 if (sigaction(SIGTERM, &sa, NULL) < 0)
350 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGTERM)");
352 if (sigaction(SIGINT, &sa, NULL) < 0)
353 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGINT)");
356 sa.sa_handler = SIG_DFL;
357 if (sigaction(SIGXCPU, &sa, NULL) < 0)
358 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGXCPU)");
361 sa.sa_handler = SIG_DFL;
362 if (sigaction(SIGXFSZ, &sa, NULL) < 0)
363 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGXFSZ)");
366 sa.sa_handler = SIG_IGN;
367 if (sigaction(SIGPIPE, &sa, NULL) < 0)
368 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGPIPE)");
371 /* we want to ignore HUPs and WINCH while we're busy processing one */
372 sigaddset(&sa.sa_mask, SIGHUP);
373 sigaddset(&sa.sa_mask, SIGWINCH);
374 sa.sa_handler = restart;
375 if (sigaction(SIGHUP, &sa, NULL) < 0)
376 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGHUP)");
377 if (sigaction(SIGWINCH, &sa, NULL) < 0)
378 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGWINCH)");
381 ap_signal(SIGSEGV, sig_coredump);
383 ap_signal(SIGBUS, sig_coredump);
386 ap_signal(SIGABORT, sig_coredump);
387 #endif /* SIGABORT */
389 ap_signal(SIGABRT, sig_coredump);
392 ap_signal(SIGILL, sig_coredump);
395 ap_signal(SIGXCPU, SIG_DFL);
398 ap_signal(SIGXFSZ, SIG_DFL);
402 ap_signal(SIGTERM, sig_term);
404 ap_signal(SIGHUP, restart);
407 ap_signal(SIGWINCH, restart);
408 #endif /* SIGWINCH */
410 ap_signal(SIGPIPE, SIG_IGN);
416 /*****************************************************************
417 * Here follows a long bunch of generic server bookkeeping stuff...
420 int ap_graceful_stop_signalled(void)
422 /* XXX - Does this really work? - Manoj */
426 /*****************************************************************
427 * Child process main loop.
430 static void process_socket(ap_pool_t *p, ap_socket_t *sock, long conn_id)
433 conn_rec *current_conn;
438 if ((rv = ap_get_os_sock(&csd, sock)) != APR_SUCCESS) {
439 ap_log_error(APLOG_MARK, APLOG_ERR, rv, NULL, "ap_get_os_sock");
442 if (csd >= FD_SETSIZE) {
443 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, NULL,
444 "new file descriptor %d is too large; you probably need "
445 "to rebuild Apache with a larger FD_SETSIZE "
448 ap_close_socket(sock);
452 ap_sock_disable_nagle(csd);
453 iol = ap_iol_attach_socket(p, sock);
454 conn_io = ap_bcreate(p, B_RDWR);
455 ap_bpush_iol(conn_io, iol);
457 current_conn = ap_new_apr_connection(p, ap_server_conf, conn_io, sock,
460 ap_process_connection(current_conn);
461 ap_lingering_close(current_conn);
464 static void *worker_thread(void *);
466 /* Starts a thread as long as we're below max_threads */
467 static int start_thread(void)
471 pthread_mutex_lock(&worker_thread_count_mutex);
472 if (worker_thread_count < max_threads) {
473 if (pthread_create(&thread, &worker_thread_attr, worker_thread,
474 &worker_thread_free_ids[worker_thread_count])) {
475 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf,
476 "pthread_create: unable to create worker thread");
477 /* In case system resources are maxxed out, we don't want
478 Apache running away with the CPU trying to fork over and
479 over and over again if we exit. */
481 workers_may_exit = 1;
482 pthread_mutex_unlock(&worker_thread_count_mutex);
486 worker_thread_count++;
490 static int reported = 0;
493 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, ap_server_conf,
494 "server reached MaxThreadsPerChild setting, consider raising the"
495 " MaxThreadsPerChild or NumServers settings");
498 pthread_mutex_unlock(&worker_thread_count_mutex);
501 pthread_mutex_unlock(&worker_thread_count_mutex);
505 /* Sets workers_may_exit if we received a character on the pipe_of_death */
506 static void check_pipe_of_death(void)
508 pthread_mutex_lock(&pipe_of_death_mutex);
509 if (!workers_may_exit) {
514 ret = ap_recv(listenfds[0], &pipe_read_char, &n);
515 if (ap_canonical_error(ret) == APR_EAGAIN) {
516 /* It lost the lottery. It must continue to suffer
517 * through a life of servitude. */
520 /* It won the lottery (or something else is very
521 * wrong). Embrace death with open arms. */
522 workers_may_exit = 1;
525 pthread_mutex_unlock(&pipe_of_death_mutex);
528 /* idle_thread_count should be incremented before starting a worker_thread */
530 static void *worker_thread(void *arg)
532 ap_socket_t *csd = NULL;
533 ap_pool_t *tpool; /* Pool for this thread */
534 ap_pool_t *ptrans; /* Pool for per-transaction stuff */
535 ap_socket_t *sd = NULL;
537 int curr_pollfd, last_pollfd = 0;
538 int thread_just_started = 1;
539 int thread_num = *((int *) arg);
540 long conn_id = child_num * HARD_THREAD_LIMIT + thread_num;
541 ap_pollfd_t *pollset;
545 pthread_mutex_lock(&thread_pool_parent_mutex);
546 ap_create_pool(&tpool, thread_pool_parent);
547 pthread_mutex_unlock(&thread_pool_parent_mutex);
548 ap_create_pool(&ptrans, tpool);
550 ap_setup_poll(&pollset, num_listenfds+1, tpool);
551 for(n=0 ; n <= num_listenfds ; ++n)
552 ap_add_poll_socket(pollset, listenfds[n], APR_POLLIN);
554 while (!workers_may_exit) {
555 workers_may_exit |= (max_requests_per_child != 0) && (requests_this_child <= 0);
556 if (workers_may_exit) break;
557 if (!thread_just_started) {
558 pthread_mutex_lock(&idle_thread_count_mutex);
559 if (idle_thread_count < max_spare_threads) {
561 pthread_mutex_unlock(&idle_thread_count_mutex);
564 pthread_mutex_unlock(&idle_thread_count_mutex);
569 thread_just_started = 0;
571 pthread_mutex_lock(&thread_accept_mutex);
572 if (workers_may_exit) {
573 pthread_mutex_unlock(&thread_accept_mutex);
576 if ((rv = SAFE_ACCEPT(ap_lock(process_accept_mutex)))
578 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
579 "ap_lock failed. Attempting to shutdown "
580 "process gracefully.");
581 workers_may_exit = 1;
584 while (!workers_may_exit) {
586 srv = ap_poll(pollset, &n, -1);
588 if (srv != APR_SUCCESS) {
589 if (ap_canonical_error(srv) == APR_EINTR) {
593 /* ap_poll() will only return errors in catastrophic
594 * circumstances. Let's try exiting gracefully, for now. */
595 ap_log_error(APLOG_MARK, APLOG_ERR, srv, (const server_rec *)
596 ap_server_conf, "ap_poll: (listen)");
597 workers_may_exit = 1;
599 if (workers_may_exit) break;
601 ap_get_revents(&event, listenfds[0], pollset);
602 if (event & APR_POLLIN) {
603 /* A process got a signal on the shutdown pipe. Check if we're
604 * the lucky process to die. */
605 check_pipe_of_death();
609 if (num_listenfds == 1) {
610 sd = ap_listeners->sd;
614 /* find a listener */
615 curr_pollfd = last_pollfd;
618 if (curr_pollfd > num_listenfds) {
621 /* XXX: Should we check for POLLERR? */
622 ap_get_revents(&event, listenfds[curr_pollfd], pollset);
623 if (event & APR_POLLIN) {
624 last_pollfd = curr_pollfd;
625 sd = listenfds[curr_pollfd];
628 } while (curr_pollfd != last_pollfd);
632 if (!workers_may_exit) {
633 if ((rv = ap_accept(&csd, sd, ptrans)) != APR_SUCCESS) {
634 ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, "ap_accept");
636 if ((rv = SAFE_ACCEPT(ap_unlock(process_accept_mutex)))
638 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
639 "ap_unlock failed. Attempting to shutdown "
640 "process gracefully.");
641 workers_may_exit = 1;
643 pthread_mutex_unlock(&thread_accept_mutex);
644 pthread_mutex_lock(&idle_thread_count_mutex);
645 if (idle_thread_count > min_spare_threads) {
649 if (!start_thread()) {
653 pthread_mutex_unlock(&idle_thread_count_mutex);
654 process_socket(ptrans, csd, conn_id);
655 requests_this_child--;
657 if ((rv = SAFE_ACCEPT(ap_unlock(process_accept_mutex)))
659 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
660 "ap_unlock failed. Attempting to shutdown "
661 "process gracefully.");
662 workers_may_exit = 1;
664 pthread_mutex_unlock(&thread_accept_mutex);
665 pthread_mutex_lock(&idle_thread_count_mutex);
667 pthread_mutex_unlock(&idle_thread_count_mutex);
670 ap_clear_pool(ptrans);
673 pthread_mutex_lock(&thread_pool_parent_mutex);
674 ap_destroy_pool(tpool);
675 pthread_mutex_unlock(&thread_pool_parent_mutex);
676 pthread_mutex_lock(&worker_thread_count_mutex);
677 worker_thread_count--;
678 worker_thread_free_ids[worker_thread_count] = thread_num;
679 if (worker_thread_count == 0) {
680 /* All the threads have exited, now finish the shutdown process
681 * by signalling the sigwait thread */
682 kill(my_pid, SIGTERM);
684 pthread_mutex_unlock(&worker_thread_count_mutex);
689 /* Set group privileges.
691 * Note that we use the username as set in the config files, rather than
692 * the lookup of to uid --- the same uid may have multiple passwd entries,
693 * with different sets of groups for each.
696 static int set_group_privs(uid_t uid, gid_t gid)
701 /* Get username if passed as a uid */
705 if ((ent = getpwuid(uid)) == NULL) {
706 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
707 "getpwuid: couldn't determine user name from uid %u, "
708 "you probably need to modify the User directive",
716 * Set the GID before initgroups(), since on some platforms
717 * setgid() is known to zap the group list.
719 if (setgid(gid) == -1) {
720 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
721 "setgid: unable to set group id to Group %u",
726 /* Reset `groups' attributes. */
728 if (initgroups(name, gid) == -1) {
729 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
730 "initgroups: unable to set groups for User %s "
731 "and Group %u", name, (unsigned)gid);
739 static int perchild_setup_child(int childnum)
741 child_info_t *ug = &child_info_table[childnum];
743 if (ug->uid == -1 && ug->gid == -1) {
744 return unixd_setup_child();
746 if (set_group_privs(ug->uid, ug->gid)) {
749 /* Only try to switch if we're running as root */
752 os_init_job_environment(server_conf, unixd_config.user_name, one_process) != 0 ||
754 setuid(ug->uid) == -1)) {
755 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
756 "setuid: unable to change to uid: %ld",
763 static int create_child_socket(int child_num, ap_pool_t *p)
765 struct sockaddr_un unix_addr;
769 perchild_server_conf *sconf = (perchild_server_conf *)
770 ap_get_module_config(ap_server_conf->module_config, &mpm_perchild_module);
771 char *socket_name = ap_palloc(p, strlen(sconf->sockname) + 6);
773 ap_snprintf(socket_name, strlen(socket_name), "%s.%d", sconf->sockname, child_num);
774 if (unlink(socket_name) < 0 &&
776 ap_log_error(APLOG_MARK, APLOG_ERR, errno, ap_server_conf,
777 "Couldn't unlink unix domain socket %s",
779 /* Just a warning; don't bail out */
782 if ((sd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
783 ap_log_error(APLOG_MARK, APLOG_ERR, errno, ap_server_conf,
784 "Couldn't create unix domain socket");
788 memset(&unix_addr, 0, sizeof(unix_addr));
789 unix_addr.sun_family = AF_UNIX;
790 strcpy(unix_addr.sun_path, socket_name);
792 omask = umask(0077); /* so that only Apache can use socket */
793 rc = bind(sd, (struct sockaddr *)&unix_addr, sizeof(unix_addr));
794 umask(omask); /* can't fail, so can't clobber errno */
796 ap_log_error(APLOG_MARK, APLOG_ERR, errno, ap_server_conf,
797 "Couldn't bind unix domain socket %s",
802 if (listen(sd, DEFAULT_PERCHILD_LISTENBACKLOG) < 0) {
803 ap_log_error(APLOG_MARK, APLOG_ERR, errno, ap_server_conf,
804 "Couldn't listen on unix domain socket");
809 if (chown(socket_name, unixd_config.user_id, -1) < 0) {
810 ap_log_error(APLOG_MARK, APLOG_ERR, errno, ap_server_conf,
811 "Couldn't change owner of unix domain socket %s",
819 static void child_main(int child_num_arg)
829 child_num = child_num_arg;
830 ap_create_pool(&pchild, pconf);
832 /*stuff to do before we switch id's, so we have permissions.*/
834 rv = SAFE_ACCEPT(ap_child_init_lock(&process_accept_mutex, lock_fname,
836 if (rv != APR_SUCCESS) {
837 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
838 "Couldn't initialize cross-process lock in child");
839 clean_child_exit(APEXIT_CHILDFATAL);
842 /* Add the sockets for this child process's virtual hosts */
843 sd = create_child_socket(child_num, pchild);
845 if (perchild_setup_child(child_num)) {
846 clean_child_exit(APEXIT_CHILDFATAL);
849 ap_child_init_hook(pchild, ap_server_conf);
851 /*done with init critical section */
853 /* All threads should mask signals out, accoring to sigwait(2) man page */
854 sigfillset(&sig_mask);
856 #ifdef SIGPROCMASK_SETS_THREAD_MASK
857 if (sigprocmask(SIG_SETMASK, &sig_mask, NULL) != 0) {
858 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf, "sigprocmask");
861 if (pthread_sigmask(SIG_SETMASK, &sig_mask, NULL) != 0) {
862 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf,
867 requests_this_child = max_requests_per_child;
869 /* Set up the pollfd array, num_listenfds + 1 for the pipe and 1 for
872 listenfds = ap_pcalloc(pchild, sizeof(*listenfds) * (num_listenfds + 2));
873 #if APR_FILES_AS_SOCKETS
874 ap_socket_from_file(&listenfds[0], pipe_of_death_in);
876 for (lr = ap_listeners, i = 1; i <= num_listenfds; lr = lr->next, ++i)
879 /* Setup worker threads */
881 if (threads_to_start > max_threads) {
882 threads_to_start = max_threads;
884 idle_thread_count = threads_to_start;
885 worker_thread_count = 0;
886 for (i = 0; i < max_threads; i++) {
887 worker_thread_free_ids[i] = i;
889 ap_create_pool(&thread_pool_parent, pchild);
890 pthread_mutex_init(&thread_pool_parent_mutex, NULL);
891 pthread_mutex_init(&idle_thread_count_mutex, NULL);
892 pthread_mutex_init(&worker_thread_count_mutex, NULL);
893 pthread_mutex_init(&pipe_of_death_mutex, NULL);
894 pthread_attr_init(&worker_thread_attr);
895 #ifdef PTHREAD_ATTR_SETDETACHSTATE_ARG2_ADDR
899 pthread_attr_setdetachstate(&worker_thread_attr, &on);
902 pthread_attr_setdetachstate(&worker_thread_attr, PTHREAD_CREATE_DETACHED);
905 /* We are creating worker threads right now */
906 for (i=0; i < threads_to_start; i++) {
907 /* start_thread shouldn't fail here */
908 if (!start_thread()) {
913 /* This thread will be the one responsible for handling signals */
914 sigemptyset(&sig_mask);
915 sigaddset(&sig_mask, SIGTERM);
916 sigaddset(&sig_mask, SIGINT);
917 ap_sigwait(&sig_mask, &signal_received);
918 switch (signal_received) {
921 just_die(signal_received);
924 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf,
925 "received impossible signal: %d", signal_received);
930 static int make_child(server_rec *s, int slot, time_t now)
934 if (slot + 1 > ap_max_daemons_limit) {
935 ap_max_daemons_limit = slot + 1;
940 ap_child_table[slot].pid = getpid();
941 ap_child_table[slot].status = SERVER_ALIVE;
945 if ((pid = fork()) == -1) {
946 ap_log_error(APLOG_MARK, APLOG_ERR, errno, s,
947 "fork: Unable to fork new process");
948 /* In case system resources are maxxed out, we don't want
949 Apache running away with the CPU trying to fork over and
950 over and over again. */
957 #ifdef AIX_BIND_PROCESSOR
958 /* By default, AIX binds to a single processor. This bit unbinds
959 children which will then bind to another CPU.
961 #include <sys/processor.h>
962 int status = bindprocessor(BINDPROCESS, (int)getpid(),
963 PROCESSOR_CLASS_ANY);
965 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, errno,
966 ap_server_conf, "processor unbind failed %d", status);
969 RAISE_SIGSTOP(MAKE_CHILD);
971 /* XXX - For an unthreaded server, a signal handler will be necessary
972 ap_signal(SIGTERM, just_die);
979 ap_child_table[slot].pid = pid;
980 ap_child_table[slot].status = SERVER_ALIVE;
985 /* start up a bunch of children */
986 static int startup_children(int number_to_start)
990 for (i = 0; number_to_start && i < num_daemons; ++i) {
991 if (ap_child_table[i].pid) {
994 if (make_child(ap_server_conf, i, 0) < 0) {
999 return number_to_start;
1004 * spawn_rate is the number of children that will be spawned on the
1005 * next maintenance cycle if there aren't enough servers. It is
1006 * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
1007 * without the need to spawn.
1009 static int spawn_rate = 1;
1010 #ifndef MAX_SPAWN_RATE
1011 #define MAX_SPAWN_RATE (32)
1013 static int hold_off_on_exponential_spawning;
1015 static void perform_child_maintenance(void)
1020 int free_slots[MAX_SPAWN_RATE];
1021 int last_non_dead = -1;
1023 /* initialize the free_list */
1026 for (i = 0; i < num_daemons; ++i) {
1027 if (ap_child_table[i].pid == 0) {
1028 if (free_length < spawn_rate) {
1029 free_slots[free_length] = i;
1037 if (i >= ap_max_daemons_limit && free_length >= spawn_rate) {
1041 ap_max_daemons_limit = last_non_dead + 1;
1043 if (free_length > 0) {
1044 for (i = 0; i < free_length; ++i) {
1045 make_child(ap_server_conf, free_slots[i], now);
1047 /* the next time around we want to spawn twice as many if this
1048 * wasn't good enough, but not if we've just done a graceful
1050 if (hold_off_on_exponential_spawning) {
1051 --hold_off_on_exponential_spawning;
1053 else if (spawn_rate < MAX_SPAWN_RATE) {
1062 static void server_main_loop(int remaining_children_to_start)
1069 while (!restart_pending && !shutdown_pending) {
1070 ap_wait_or_timeout(&status, &pid, pconf);
1072 if (pid.pid != -1) {
1073 ap_process_child_status(&pid, status);
1074 /* non-fatal death... note that it's gone in the child table and
1075 * clean out the status table. */
1077 for (i = 0; i < ap_max_daemons_limit; ++i) {
1078 if (ap_child_table[i].pid == pid.pid) {
1082 for (j = 0; j < HARD_THREAD_LIMIT; j++) {
1083 ap_perchild_force_reset_connection_status(i * HARD_THREAD_LIMIT + j);
1088 if (child_slot >= 0) {
1089 ap_child_table[child_slot].pid = 0;
1091 if (remaining_children_to_start
1092 && child_slot < num_daemons) {
1093 /* we're still doing a 1-for-1 replacement of dead
1094 * children with new children
1096 make_child(ap_server_conf, child_slot, time(NULL));
1097 --remaining_children_to_start;
1099 #if APR_HAS_OTHER_CHILD
1101 else if (ap_reap_other_child(&pid, status) == 0) {
1105 else if (is_graceful) {
1106 /* Great, we've probably just lost a slot in the
1107 * child table. Somehow we don't know about this
1110 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0,
1112 "long lost child came home! (pid %ld)",
1115 /* Don't perform idle maintenance when a child dies,
1116 * only do it when there's a timeout. Remember only a
1117 * finite number of children can die, and it's pretty
1118 * pathological for a lot to die suddenly.
1122 else if (remaining_children_to_start) {
1123 /* we hit a 1 second timeout in which none of the previous
1124 * generation of children needed to be reaped... so assume
1125 * they're all done, and pick up the slack if any is left.
1127 remaining_children_to_start = \
1128 startup_children(remaining_children_to_start);
1129 /* In any event we really shouldn't do the code below because
1130 * few of the servers we just started are in the IDLE state
1131 * yet, so we'd mistakenly create an extra server.
1136 perform_child_maintenance();
1140 int ap_mpm_run(ap_pool_t *_pconf, ap_pool_t *plog, server_rec *s)
1142 int remaining_children_to_start;
1149 if ((rv = ap_create_pipe(&pipe_of_death_in, &pipe_of_death_out, pconf))
1151 ap_log_error(APLOG_MARK, APLOG_ERR, rv,
1152 (const server_rec*) ap_server_conf,
1153 "ap_create_pipe (pipe_of_death)");
1156 if ((rv = ap_set_pipe_timeout(pipe_of_death_in, 0)) != APR_SUCCESS) {
1157 ap_log_error(APLOG_MARK, APLOG_ERR, rv,
1158 (const server_rec*) ap_server_conf,
1159 "ap_set_pipe_timeout (pipe_of_death)");
1163 if ((num_listenfds = ap_setup_listeners(ap_server_conf)) < 1) {
1164 /* XXX: hey, what's the right way for the mpm to indicate a fatal error? */
1165 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, 0, s,
1166 "no listening sockets available, shutting down");
1169 ap_log_pid(pconf, ap_pid_fname);
1171 /* Initialize cross-process accept lock */
1172 lock_fname = ap_psprintf(_pconf, "%s.%u",
1173 ap_server_root_relative(_pconf, lock_fname),
1175 rv = SAFE_ACCEPT(ap_create_lock(&process_accept_mutex, APR_MUTEX,
1176 APR_CROSS_PROCESS, lock_fname, _pconf));
1177 if (rv != APR_SUCCESS) {
1178 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
1179 "Couldn't create cross-process lock");
1184 reinit_scoreboard(pconf);
1186 /* Initialize the child table */
1188 for (i = 0; i < HARD_SERVER_LIMIT; i++) {
1189 ap_child_table[i].pid = 0;
1195 /* If we're doing a graceful_restart then we're going to see a lot
1196 * of children exiting immediately when we get into the main loop
1197 * below (because we just sent them SIGWINCH). This happens pretty
1198 * rapidly... and for each one that exits we'll start a new one until
1199 * we reach at least daemons_min_free. But we may be permitted to
1200 * start more than that, so we'll just keep track of how many we're
1201 * supposed to start up without the 1 second penalty between each fork.
1203 remaining_children_to_start = num_daemons;
1205 remaining_children_to_start = \
1206 startup_children(remaining_children_to_start);
1209 /* give the system some time to recover before kicking into
1210 * exponential mode */
1211 hold_off_on_exponential_spawning = 10;
1214 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
1215 "%s configured -- resuming normal operations",
1216 ap_get_server_version());
1217 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, ap_server_conf,
1218 "Server built: %s", ap_get_server_built());
1219 restart_pending = shutdown_pending = 0;
1221 server_main_loop(remaining_children_to_start);
1223 if (shutdown_pending) {
1224 /* Time to gracefully shut down:
1225 * Kill child processes, tell them to call child_exit, etc...
1227 if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
1228 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf,
1231 ap_reclaim_child_processes(1); /* Start with SIGTERM */
1233 /* cleanup pid file on normal shutdown */
1235 const char *pidfile = NULL;
1236 pidfile = ap_server_root_relative (pconf, ap_pid_fname);
1237 if ( pidfile != NULL && unlink(pidfile) == 0)
1238 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0,
1240 "removed PID file %s (pid=%ld)",
1241 pidfile, (long)getpid());
1244 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0,
1245 ap_server_conf, "caught SIGTERM, shutting down");
1250 /* we've been told to restart */
1251 ap_signal(SIGHUP, SIG_IGN);
1254 /* not worth thinking about */
1259 char char_of_death = '!';
1261 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
1262 "SIGWINCH received. Doing graceful restart");
1264 /* This is mostly for debugging... so that we know what is still
1265 * gracefully dealing with existing request.
1268 for (i = 0; i < num_daemons; ++i) {
1269 if (ap_child_table[i].pid) {
1270 ap_child_table[i].status = SERVER_DYING;
1273 /* give the children the signal to die */
1274 for (i = 0; i < num_daemons;) {
1275 if ((rv = ap_write(pipe_of_death_out, &char_of_death, &one)) != APR_SUCCESS) {
1276 if (ap_canonical_error(rv) == APR_EINTR) continue;
1277 ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf,
1278 "write pipe_of_death");
1284 /* Kill 'em all. Since the child acts the same on the parents SIGTERM
1285 * and a SIGHUP, we may as well use the same signal, because some user
1286 * pthreads are stealing signals from us left and right.
1288 if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
1289 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf,
1292 ap_reclaim_child_processes(1); /* Start with SIGTERM */
1293 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0,
1294 ap_server_conf, "SIGHUP received. Attempting to restart");
1299 static void perchild_pre_config(ap_pool_t *p, ap_pool_t *plog, ap_pool_t *ptemp)
1301 static int restart_num = 0;
1304 one_process = !!getenv("ONE_PROCESS");
1306 /* sigh, want this only the second time around */
1307 if (restart_num++ == 1) {
1318 ap_listen_pre_config();
1319 num_daemons = DEFAULT_NUM_DAEMON;
1320 threads_to_start = DEFAULT_START_THREAD;
1321 min_spare_threads = DEFAULT_MIN_SPARE_THREAD;
1322 max_spare_threads = DEFAULT_MAX_SPARE_THREAD;
1323 max_threads = HARD_THREAD_LIMIT;
1324 ap_pid_fname = DEFAULT_PIDLOG;
1325 ap_scoreboard_fname = DEFAULT_SCOREBOARD;
1326 lock_fname = DEFAULT_LOCKFILE;
1327 max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
1328 ap_perchild_set_maintain_connection_status(1);
1329 socket_info_table = ap_make_hash(p);
1331 ap_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
1333 for (i = 0; i < HARD_SERVER_LIMIT; i++) {
1334 child_info_table[i].uid = -1;
1335 child_info_table[i].gid = -1;
1339 static int perchild_post_read(request_rec *r)
1341 const char *hostname = ap_table_get(r->headers_in, "Host");
1345 process_num = ap_hash_get(socket_info_table, hostname, 0);
1346 num = atoi(process_num);
1348 if (num != child_num) {
1349 /* package the request and send it to another child */
1355 static void perchild_hooks(void)
1360 ap_hook_pre_config(perchild_pre_config, NULL, NULL, AP_HOOK_MIDDLE);
1361 /* This must be run absolutely first. If this request isn't for this
1362 * server then we need to forward it to the proper child. No sense
1363 * tying up this server running more post_read request hooks if it is
1364 * just going to be forwarded along.
1366 ap_hook_post_read_request(perchild_post_read, NULL, NULL, AP_HOOK_REALLY_FIRST);
1369 static const char *set_pidfile(cmd_parms *cmd, void *dummy, const char *arg)
1371 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1376 if (cmd->server->is_virtual) {
1377 return "PidFile directive not allowed in <VirtualHost>";
1383 static const char *set_scoreboard(cmd_parms *cmd, void *dummy, const char *arg)
1385 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1390 ap_scoreboard_fname = arg;
1394 static const char *set_lockfile(cmd_parms *cmd, void *dummy, const char *arg)
1396 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1404 static const char *set_num_daemons (cmd_parms *cmd, void *dummy, const char *arg)
1406 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1411 num_daemons = atoi(arg);
1412 if (num_daemons > HARD_SERVER_LIMIT) {
1413 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1414 "WARNING: NumServers of %d exceeds compile time limit "
1415 "of %d servers,", num_daemons, HARD_SERVER_LIMIT);
1416 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1417 " lowering NumServers to %d. To increase, please "
1418 "see the", HARD_SERVER_LIMIT);
1419 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1420 " HARD_SERVER_LIMIT define in %s.",
1421 AP_MPM_HARD_LIMITS_FILE);
1422 num_daemons = HARD_SERVER_LIMIT;
1424 else if (num_daemons < 1) {
1425 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1426 "WARNING: Require NumServers > 0, setting to 1");
1432 static const char *set_threads_to_start (cmd_parms *cmd, void *dummy, const char *arg)
1434 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1439 threads_to_start = atoi(arg);
1440 if (threads_to_start > HARD_THREAD_LIMIT) {
1441 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1442 "WARNING: StartThreads of %d exceeds compile time"
1443 " limit of %d threads,", threads_to_start,
1445 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1446 " lowering StartThreads to %d. To increase, please"
1447 " see the", HARD_THREAD_LIMIT);
1448 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1449 " HARD_THREAD_LIMIT define in %s.",
1450 AP_MPM_HARD_LIMITS_FILE);
1452 else if (threads_to_start < 1) {
1453 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1454 "WARNING: Require StartThreads > 0, setting to 1");
1455 threads_to_start = 1;
1460 static const char *set_min_spare_threads(cmd_parms *cmd, void *dummy, const char *arg)
1462 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1467 min_spare_threads = atoi(arg);
1468 if (min_spare_threads <= 0) {
1469 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1470 "WARNING: detected MinSpareThreads set to non-positive.");
1471 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1472 "Resetting to 1 to avoid almost certain Apache failure.");
1473 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1474 "Please read the documentation.");
1475 min_spare_threads = 1;
1481 static const char *set_max_spare_threads(cmd_parms *cmd, void *dummy, const char *arg)
1483 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1488 max_spare_threads = atoi(arg);
1489 if (max_spare_threads >= HARD_THREAD_LIMIT) {
1490 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1491 "WARNING: detected MinSpareThreads set higher than");
1492 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1493 "HARD_THREAD_LIMIT. Resetting to %d", HARD_THREAD_LIMIT);
1494 max_spare_threads = HARD_THREAD_LIMIT;
1499 static const char *set_max_threads(cmd_parms *cmd, void *dummy, const char *arg)
1501 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1506 max_threads = atoi(arg);
1507 if (max_threads > HARD_THREAD_LIMIT) {
1508 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1509 "WARNING: detected MaxThreadsPerChild set higher than");
1510 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1511 "HARD_THREAD_LIMIT. Resetting to %d", HARD_THREAD_LIMIT);
1512 max_threads = HARD_THREAD_LIMIT;
1517 static const char *set_max_requests(cmd_parms *cmd, void *dummy, const char *arg)
1519 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1524 max_requests_per_child = atoi(arg);
1529 static const char *set_maintain_connection_status(cmd_parms *cmd,
1530 void *dummy, int arg)
1532 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1537 ap_perchild_set_maintain_connection_status(arg != 0);
1541 static const char *set_coredumpdir (cmd_parms *cmd, void *dummy, const char *arg)
1545 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1550 fname = ap_server_root_relative(cmd->pool, arg);
1551 if ((ap_stat(&finfo, fname, cmd->pool) != APR_SUCCESS) ||
1552 (finfo.filetype != APR_DIR)) {
1553 return ap_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
1554 " does not exist or is not a directory", NULL);
1556 ap_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir));
1560 static const char *set_childprocess(cmd_parms *cmd, void *dummy, const char *p,
1561 const char *u, const char *g)
1563 int curr_child_num = atoi(p);
1564 child_info_t *ug = &child_info_table[curr_child_num - 1];
1566 if (curr_child_num > num_daemons) {
1567 return "Trying to use more child ID's than NumServers. Increase "
1568 "NumServers in your config file.";
1577 static const char *set_socket_name(cmd_parms *cmd, void *dummy, const char *arg)
1579 server_rec *s = cmd->server;
1580 perchild_server_conf *conf = (perchild_server_conf *)
1581 ap_get_module_config(s->module_config, &mpm_perchild_module);
1583 conf->sockname = ap_server_root_relative(cmd->pool, arg);
1587 static const char *assign_childprocess(cmd_parms *cmd, void *dummy, const char *p)
1589 ap_hash_set(socket_info_table, cmd->server->server_hostname, 0, p);
1594 static const command_rec perchild_cmds[] = {
1595 UNIX_DAEMON_COMMANDS
1597 AP_INIT_TAKE1("PidFile", set_pidfile, NULL, RSRC_CONF,
1598 "A file for logging the server process ID"),
1599 AP_INIT_TAKE1("ScoreBoardFile", set_scoreboard, NULL, RSRC_CONF,
1600 "A file for Apache to maintain runtime process management information"),
1601 AP_INIT_TAKE1("LockFile", set_lockfile, NULL, RSRC_CONF,
1602 "The lockfile used when Apache needs to lock the accept() call"),
1603 AP_INIT_TAKE1("NumServers", set_num_daemons, NULL, RSRC_CONF,
1604 "Number of children alive at the same time"),
1605 AP_INIT_TAKE1("StartThreads", set_threads_to_start, NULL, RSRC_CONF,
1606 "Number of threads each child creates"),
1607 AP_INIT_TAKE1("MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF,
1608 "Minimum number of idle threads per child, to handle request spikes"),
1609 AP_INIT_TAKE1("MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF,
1610 "Maximum number of idle threads per child"),
1611 AP_INIT_TAKE1("MaxThreadsPerChild", set_max_threads, NULL, RSRC_CONF,
1612 "Maximum number of threads per child"),
1613 AP_INIT_TAKE1("MaxRequestsPerChild", set_max_requests, NULL, RSRC_CONF,
1614 "Maximum number of requests a particular child serves before dying."),
1615 AP_INIT_FLAG("ConnectionStatus", set_maintain_connection_status, NULL, RSRC_CONF,
1616 "Whether or not to maintain status information on current connections"),
1617 AP_INIT_TAKE1("CoreDumpDirectory", set_coredumpdir, NULL, RSRC_CONF,
1618 "The location of the directory Apache changes to before dumping core"),
1619 AP_INIT_TAKE3("ChildProcess", set_childprocess, NULL, RSRC_CONF,
1620 "Specify a User and Group for a specific child process."),
1621 AP_INIT_TAKE1("AssignChild", assign_childprocess, NULL, RSRC_CONF,
1622 "Tie a virtual host to a specific child process."),
1623 AP_INIT_TAKE1("ChildSockName", set_socket_name, NULL, RSRC_CONF,
1624 "the base name of the socket to use for communication between "
1625 "child processes. The actual socket will be "
1626 "basename.childnum"),
1630 static void *perchild_create_config(ap_pool_t *p, server_rec *s)
1632 perchild_server_conf *c =
1633 (perchild_server_conf *) ap_pcalloc(p, sizeof(perchild_server_conf));
1635 c->sockname = ap_server_root_relative(p, DEFAULT_PERCHILD_SOCKET);
1639 module MODULE_VAR_EXPORT mpm_perchild_module = {
1641 NULL, /* hook to run before apache parses args */
1642 NULL, /* create per-directory config structure */
1643 NULL, /* merge per-directory config structures */
1644 perchild_create_config, /* create per-server config structure */
1645 NULL, /* merge per-server config structures */
1646 perchild_cmds, /* command ap_table_t */
1647 NULL, /* handlers */
1648 perchild_hooks /* register_hooks */