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 curr_child_num=0;
112 static int socket_num=0;
113 static int workers_may_exit = 0;
114 static int requests_this_child;
115 static int num_listenfds = 0;
116 static ap_socket_t **listenfds;
118 struct child_info_t {
121 char *name; /* The extention for this socket. "uig:gid" */
126 struct socket_info_t {
127 const char *sname; /* The servername */
128 int cnum; /* The socket number */
132 const char *sockname;
133 } perchild_server_conf;
135 typedef struct child_info_t child_info_t;
136 typedef struct socket_info_t socket_info_t;
138 /* Tables used to determine the user and group each child process should
139 * run as. The hash table is used to correlate a server name with a child
142 static child_info_t child_info_table[HARD_SERVER_LIMIT];
143 static ap_hash_t *socket_info_table = NULL;
146 struct ap_ctable ap_child_table[HARD_SERVER_LIMIT];
149 * The max child slot ever assigned, preserved across restarts. Necessary
150 * to deal with NumServers changes across SIGWINCH restarts. We use this
151 * value to optimize routines that have to scan the entire child table.
153 * XXX - It might not be worth keeping this code in. There aren't very
154 * many child processes in this MPM.
156 int ap_max_daemons_limit = -1;
158 char ap_coredump_dir[MAX_STRING_LEN];
160 module MODULE_VAR_EXPORT mpm_perchild_module;
162 static ap_file_t *pipe_of_death_in = NULL;
163 static ap_file_t *pipe_of_death_out = NULL;
164 static pthread_mutex_t pipe_of_death_mutex;
166 /* *Non*-shared http_main globals... */
168 server_rec *ap_server_conf;
170 /* one_process --- debugging mode variable; can be set from the command line
171 * with the -X flag. If set, this gets you the child_main loop running
172 * in the process which originally started up (no detach, no make_child),
173 * which is a pretty nice debugging environment. (You'll get a SIGHUP
174 * early in standalone_main; just continue through. This is the server
175 * trying to kill off any child processes which it might have lying
176 * around --- Apache doesn't keep track of their pids, it just sends
177 * SIGHUP to the process group, ignoring it in the root process.
178 * Continue through and you'll be fine.).
181 static int one_process = 0;
184 int raise_sigstop_flags;
187 static ap_pool_t *pconf; /* Pool for config stuff */
188 static ap_pool_t *pchild; /* Pool for httpd child stuff */
189 static ap_pool_t *thread_pool_parent; /* Parent of per-thread pools */
190 static pthread_mutex_t thread_pool_parent_mutex;
192 static int child_num;
193 static unsigned int my_pid; /* Linux getpid() doesn't work except in
194 main thread. Use this instead */
195 /* Keep track of the number of worker threads currently active */
196 static int worker_thread_count;
197 static pthread_mutex_t worker_thread_count_mutex;
198 static int worker_thread_free_ids[HARD_THREAD_LIMIT];
199 static pthread_attr_t worker_thread_attr;
201 /* Keep track of the number of idle worker threads */
202 static int idle_thread_count;
203 static pthread_mutex_t idle_thread_count_mutex;
205 /* Locks for accept serialization */
206 #ifdef NO_SERIALIZED_ACCEPT
207 #define SAFE_ACCEPT(stmt) APR_SUCCESS
209 #define SAFE_ACCEPT(stmt) (stmt)
210 static ap_lock_t *process_accept_mutex;
211 #endif /* NO_SERIALIZED_ACCEPT */
212 static const char *lock_fname;
213 static pthread_mutex_t thread_accept_mutex = PTHREAD_MUTEX_INITIALIZER;
215 API_EXPORT(int) ap_get_max_daemons(void)
217 return ap_max_daemons_limit;
220 /* a clean exit from a child with proper cleanup */
221 static void clean_child_exit(int code)
224 ap_destroy_pool(pchild);
229 /* handle all varieties of core dumping signals */
230 static void sig_coredump(int sig)
232 chdir(ap_coredump_dir);
233 ap_signal(sig, SIG_DFL);
235 /* At this point we've got sig blocked, because we're still inside
236 * the signal handler. When we leave the signal handler it will
237 * be unblocked, and we'll take the signal... and coredump or whatever
238 * is appropriate for this particular Unix. In addition the parent
239 * will see the real signal we received -- whereas if we called
240 * abort() here, the parent would only see SIGABRT.
244 static void just_die(int sig)
249 /*****************************************************************
250 * Connection structures and accounting...
253 /* volatile just in case */
254 static int volatile shutdown_pending;
255 static int volatile restart_pending;
256 static int volatile is_graceful;
259 * ap_start_shutdown() and ap_start_restart(), below, are a first stab at
260 * functions to initiate shutdown or restart without relying on signals.
261 * Previously this was initiated in sig_term() and restart() signal handlers,
262 * but we want to be able to start a shutdown/restart from other sources --
263 * e.g. on Win32, from the service manager. Now the service manager can
264 * call ap_start_shutdown() or ap_start_restart() as appropiate. Note that
265 * these functions can also be called by the child processes, since global
266 * variables are no longer used to pass on the required action to the parent.
268 * These should only be called from the parent process itself, since the
269 * parent process will use the shutdown_pending and restart_pending variables
270 * to determine whether to shutdown or restart. The child process should
271 * call signal_parent() directly to tell the parent to die -- this will
272 * cause neither of those variable to be set, which the parent will
273 * assume means something serious is wrong (which it will be, for the
274 * child to force an exit) and so do an exit anyway.
277 void ap_start_shutdown(void)
279 if (shutdown_pending == 1) {
280 /* Um, is this _probably_ not an error, if the user has
281 * tried to do a shutdown twice quickly, so we won't
282 * worry about reporting it.
286 shutdown_pending = 1;
289 /* do a graceful restart if graceful == 1 */
290 static void ap_start_restart(int graceful)
293 if (restart_pending == 1) {
294 /* Probably not an error - don't bother reporting it */
298 is_graceful = graceful;
300 ap_kill_cleanup(pconf, NULL, ap_cleanup_shared_mem);
304 static void sig_term(int sig)
309 static void restart(int sig)
312 ap_start_restart(sig == SIGWINCH);
318 static void set_signals(void)
320 #ifndef NO_USE_SIGACTION
323 sigemptyset(&sa.sa_mask);
327 sa.sa_handler = sig_coredump;
328 #if defined(SA_ONESHOT)
329 sa.sa_flags = SA_ONESHOT;
330 #elif defined(SA_RESETHAND)
331 sa.sa_flags = SA_RESETHAND;
333 if (sigaction(SIGSEGV, &sa, NULL) < 0)
334 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGSEGV)");
336 if (sigaction(SIGBUS, &sa, NULL) < 0)
337 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGBUS)");
340 if (sigaction(SIGABORT, &sa, NULL) < 0)
341 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABORT)");
344 if (sigaction(SIGABRT, &sa, NULL) < 0)
345 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABRT)");
348 if (sigaction(SIGILL, &sa, NULL) < 0)
349 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGILL)");
353 sa.sa_handler = sig_term;
354 if (sigaction(SIGTERM, &sa, NULL) < 0)
355 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGTERM)");
357 if (sigaction(SIGINT, &sa, NULL) < 0)
358 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGINT)");
361 sa.sa_handler = SIG_DFL;
362 if (sigaction(SIGXCPU, &sa, NULL) < 0)
363 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGXCPU)");
366 sa.sa_handler = SIG_DFL;
367 if (sigaction(SIGXFSZ, &sa, NULL) < 0)
368 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGXFSZ)");
371 sa.sa_handler = SIG_IGN;
372 if (sigaction(SIGPIPE, &sa, NULL) < 0)
373 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGPIPE)");
376 /* we want to ignore HUPs and WINCH while we're busy processing one */
377 sigaddset(&sa.sa_mask, SIGHUP);
378 sigaddset(&sa.sa_mask, SIGWINCH);
379 sa.sa_handler = restart;
380 if (sigaction(SIGHUP, &sa, NULL) < 0)
381 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGHUP)");
382 if (sigaction(SIGWINCH, &sa, NULL) < 0)
383 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGWINCH)");
386 ap_signal(SIGSEGV, sig_coredump);
388 ap_signal(SIGBUS, sig_coredump);
391 ap_signal(SIGABORT, sig_coredump);
392 #endif /* SIGABORT */
394 ap_signal(SIGABRT, sig_coredump);
397 ap_signal(SIGILL, sig_coredump);
400 ap_signal(SIGXCPU, SIG_DFL);
403 ap_signal(SIGXFSZ, SIG_DFL);
407 ap_signal(SIGTERM, sig_term);
409 ap_signal(SIGHUP, restart);
412 ap_signal(SIGWINCH, restart);
413 #endif /* SIGWINCH */
415 ap_signal(SIGPIPE, SIG_IGN);
421 /*****************************************************************
422 * Here follows a long bunch of generic server bookkeeping stuff...
425 int ap_graceful_stop_signalled(void)
427 /* XXX - Does this really work? - Manoj */
431 /*****************************************************************
432 * Child process main loop.
435 static void process_socket(ap_pool_t *p, ap_socket_t *sock, long conn_id)
438 conn_rec *current_conn;
443 if ((rv = ap_get_os_sock(&csd, sock)) != APR_SUCCESS) {
444 ap_log_error(APLOG_MARK, APLOG_ERR, rv, NULL, "ap_get_os_sock");
447 if (csd >= FD_SETSIZE) {
448 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, NULL,
449 "new file descriptor %d is too large; you probably need "
450 "to rebuild Apache with a larger FD_SETSIZE "
453 ap_close_socket(sock);
457 ap_sock_disable_nagle(csd);
458 iol = ap_iol_attach_socket(p, sock);
459 conn_io = ap_bcreate(p, B_RDWR);
460 ap_bpush_iol(conn_io, iol);
462 current_conn = ap_new_apr_connection(p, ap_server_conf, conn_io, sock,
465 ap_process_connection(current_conn);
466 ap_lingering_close(current_conn);
469 static void *worker_thread(void *);
471 /* Starts a thread as long as we're below max_threads */
472 static int start_thread(void)
477 pthread_mutex_lock(&worker_thread_count_mutex);
478 if (worker_thread_count < max_threads) {
479 if ((rc = pthread_create(&thread, &worker_thread_attr, worker_thread,
480 &worker_thread_free_ids[worker_thread_count]))) {
481 #ifdef PTHREAD_SETS_ERRNO
484 ap_log_error(APLOG_MARK, APLOG_ALERT, rc, ap_server_conf,
485 "pthread_create: unable to create worker thread");
486 /* In case system resources are maxxed out, we don't want
487 Apache running away with the CPU trying to fork over and
488 over and over again if we exit. */
490 workers_may_exit = 1;
491 pthread_mutex_unlock(&worker_thread_count_mutex);
495 worker_thread_count++;
499 static int reported = 0;
502 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, ap_server_conf,
503 "server reached MaxThreadsPerChild setting, consider raising the"
504 " MaxThreadsPerChild or NumServers settings");
507 pthread_mutex_unlock(&worker_thread_count_mutex);
510 pthread_mutex_unlock(&worker_thread_count_mutex);
514 /* Sets workers_may_exit if we received a character on the pipe_of_death */
515 static void check_pipe_of_death(void)
517 pthread_mutex_lock(&pipe_of_death_mutex);
518 if (!workers_may_exit) {
523 ret = ap_recv(listenfds[0], &pipe_read_char, &n);
524 if (ap_canonical_error(ret) == APR_EAGAIN) {
525 /* It lost the lottery. It must continue to suffer
526 * through a life of servitude. */
529 /* It won the lottery (or something else is very
530 * wrong). Embrace death with open arms. */
531 workers_may_exit = 1;
534 pthread_mutex_unlock(&pipe_of_death_mutex);
537 /* idle_thread_count should be incremented before starting a worker_thread */
539 static void *worker_thread(void *arg)
541 ap_socket_t *csd = NULL;
542 ap_pool_t *tpool; /* Pool for this thread */
543 ap_pool_t *ptrans; /* Pool for per-transaction stuff */
544 ap_socket_t *sd = NULL;
546 int curr_pollfd, last_pollfd = 0;
547 int thread_just_started = 1;
548 int thread_num = *((int *) arg);
549 long conn_id = child_num * HARD_THREAD_LIMIT + thread_num;
550 ap_pollfd_t *pollset;
554 pthread_mutex_lock(&thread_pool_parent_mutex);
555 ap_create_pool(&tpool, thread_pool_parent);
556 pthread_mutex_unlock(&thread_pool_parent_mutex);
557 ap_create_pool(&ptrans, tpool);
559 ap_setup_poll(&pollset, num_listenfds+1, tpool);
560 for(n=0 ; n <= num_listenfds ; ++n) {
561 ap_add_poll_socket(pollset, listenfds[n], APR_POLLIN);
564 while (!workers_may_exit) {
565 workers_may_exit |= (max_requests_per_child != 0) && (requests_this_child <= 0);
566 if (workers_may_exit) break;
567 if (!thread_just_started) {
568 pthread_mutex_lock(&idle_thread_count_mutex);
569 if (idle_thread_count < max_spare_threads) {
571 pthread_mutex_unlock(&idle_thread_count_mutex);
574 pthread_mutex_unlock(&idle_thread_count_mutex);
579 thread_just_started = 0;
581 pthread_mutex_lock(&thread_accept_mutex);
582 if (workers_may_exit) {
583 pthread_mutex_unlock(&thread_accept_mutex);
586 if ((rv = SAFE_ACCEPT(ap_lock(process_accept_mutex)))
588 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
589 "ap_lock failed. Attempting to shutdown "
590 "process gracefully.");
591 workers_may_exit = 1;
594 while (!workers_may_exit) {
596 srv = ap_poll(pollset, &n, -1);
598 if (srv != APR_SUCCESS) {
599 if (ap_canonical_error(srv) == APR_EINTR) {
603 /* ap_poll() will only return errors in catastrophic
604 * circumstances. Let's try exiting gracefully, for now. */
605 ap_log_error(APLOG_MARK, APLOG_ERR, srv, (const server_rec *)
606 ap_server_conf, "ap_poll: (listen)");
607 workers_may_exit = 1;
609 if (workers_may_exit) break;
611 ap_get_revents(&event, listenfds[0], pollset);
612 if (event & APR_POLLIN) {
613 /* A process got a signal on the shutdown pipe. Check if we're
614 * the lucky process to die. */
615 check_pipe_of_death();
619 if (num_listenfds == 1) {
620 sd = ap_listeners->sd;
624 /* find a listener */
625 curr_pollfd = last_pollfd;
628 if (curr_pollfd > num_listenfds) {
631 /* XXX: Should we check for POLLERR? */
632 ap_get_revents(&event, listenfds[curr_pollfd], pollset);
633 if (event & APR_POLLIN) {
634 last_pollfd = curr_pollfd;
635 sd = listenfds[curr_pollfd];
638 } while (curr_pollfd != last_pollfd);
642 if (!workers_may_exit) {
643 if ((rv = ap_accept(&csd, sd, ptrans)) != APR_SUCCESS) {
644 ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, "ap_accept");
646 if ((rv = SAFE_ACCEPT(ap_unlock(process_accept_mutex)))
648 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
649 "ap_unlock failed. Attempting to shutdown "
650 "process gracefully.");
651 workers_may_exit = 1;
653 pthread_mutex_unlock(&thread_accept_mutex);
654 pthread_mutex_lock(&idle_thread_count_mutex);
655 if (idle_thread_count > min_spare_threads) {
659 if (!start_thread()) {
663 pthread_mutex_unlock(&idle_thread_count_mutex);
664 process_socket(ptrans, csd, conn_id);
665 requests_this_child--;
667 if ((rv = SAFE_ACCEPT(ap_unlock(process_accept_mutex)))
669 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
670 "ap_unlock failed. Attempting to shutdown "
671 "process gracefully.");
672 workers_may_exit = 1;
674 pthread_mutex_unlock(&thread_accept_mutex);
675 pthread_mutex_lock(&idle_thread_count_mutex);
677 pthread_mutex_unlock(&idle_thread_count_mutex);
680 ap_clear_pool(ptrans);
683 pthread_mutex_lock(&thread_pool_parent_mutex);
684 ap_destroy_pool(tpool);
685 pthread_mutex_unlock(&thread_pool_parent_mutex);
686 pthread_mutex_lock(&worker_thread_count_mutex);
687 worker_thread_count--;
688 worker_thread_free_ids[worker_thread_count] = thread_num;
689 if (worker_thread_count == 0) {
690 /* All the threads have exited, now finish the shutdown process
691 * by signalling the sigwait thread */
692 kill(my_pid, SIGTERM);
694 pthread_mutex_unlock(&worker_thread_count_mutex);
699 /* Set group privileges.
701 * Note that we use the username as set in the config files, rather than
702 * the lookup of to uid --- the same uid may have multiple passwd entries,
703 * with different sets of groups for each.
706 static int set_group_privs(uid_t uid, gid_t gid)
711 /* Get username if passed as a uid */
715 if ((ent = getpwuid(uid)) == NULL) {
716 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
717 "getpwuid: couldn't determine user name from uid %u, "
718 "you probably need to modify the User directive",
726 * Set the GID before initgroups(), since on some platforms
727 * setgid() is known to zap the group list.
729 if (setgid(gid) == -1) {
730 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
731 "setgid: unable to set group id to Group %u",
736 /* Reset `groups' attributes. */
738 if (initgroups(name, gid) == -1) {
739 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
740 "initgroups: unable to set groups for User %s "
741 "and Group %u", name, (unsigned)gid);
749 static int perchild_setup_child(int childnum)
751 child_info_t *ug = &child_info_table[childnum];
753 if (ug->uid == -1 && ug->gid == -1) {
754 return unixd_setup_child();
756 if (set_group_privs(ug->uid, ug->gid)) {
759 /* Only try to switch if we're running as root */
762 os_init_job_environment(server_conf, unixd_config.user_name, one_process) != 0 ||
764 setuid(ug->uid) == -1)) {
765 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
766 "setuid: unable to change to uid: %ld",
773 static int create_child_socket(int child_num, ap_pool_t *p)
775 struct sockaddr_un unix_addr;
779 perchild_server_conf *sconf = (perchild_server_conf *)
780 ap_get_module_config(ap_server_conf->module_config, &mpm_perchild_module);
781 int len = strlen(sconf->sockname) + strlen(child_info_table[child_num].name) + 3;
782 char *socket_name = ap_palloc(p, len);
784 ap_snprintf(socket_name, len, "%s.%s", sconf->sockname, child_info_table[child_num].name);
785 if (unlink(socket_name) < 0 &&
787 ap_log_error(APLOG_MARK, APLOG_ERR, errno, ap_server_conf,
788 "Couldn't unlink unix domain socket %s",
790 /* Just a warning; don't bail out */
793 if ((sd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
794 ap_log_error(APLOG_MARK, APLOG_ERR, errno, ap_server_conf,
795 "Couldn't create unix domain socket");
799 memset(&unix_addr, 0, sizeof(unix_addr));
800 unix_addr.sun_family = AF_UNIX;
801 strcpy(unix_addr.sun_path, socket_name);
803 omask = umask(0077); /* so that only Apache can use socket */
804 rc = bind(sd, (struct sockaddr *)&unix_addr, sizeof(unix_addr));
805 umask(omask); /* can't fail, so can't clobber errno */
807 ap_log_error(APLOG_MARK, APLOG_ERR, errno, ap_server_conf,
808 "Couldn't bind unix domain socket %s",
813 if (listen(sd, DEFAULT_PERCHILD_LISTENBACKLOG) < 0) {
814 ap_log_error(APLOG_MARK, APLOG_ERR, errno, ap_server_conf,
815 "Couldn't listen on unix domain socket");
820 if (chown(socket_name, unixd_config.user_id, -1) < 0) {
821 ap_log_error(APLOG_MARK, APLOG_ERR, errno, ap_server_conf,
822 "Couldn't change owner of unix domain socket %s",
830 static void child_main(int child_num_arg)
839 child_num = child_num_arg;
840 ap_create_pool(&pchild, pconf);
842 /*stuff to do before we switch id's, so we have permissions.*/
844 rv = SAFE_ACCEPT(ap_child_init_lock(&process_accept_mutex, lock_fname,
846 if (rv != APR_SUCCESS) {
847 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
848 "Couldn't initialize cross-process lock in child");
849 clean_child_exit(APEXIT_CHILDFATAL);
852 if (perchild_setup_child(child_num)) {
853 clean_child_exit(APEXIT_CHILDFATAL);
856 ap_child_init_hook(pchild, ap_server_conf);
858 /*done with init critical section */
860 /* All threads should mask signals out, accoring to sigwait(2) man page */
861 sigfillset(&sig_mask);
863 #ifdef SIGPROCMASK_SETS_THREAD_MASK
864 if (sigprocmask(SIG_SETMASK, &sig_mask, NULL) != 0) {
865 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf, "sigprocmask");
868 if ((rv = pthread_sigmask(SIG_SETMASK, &sig_mask, NULL)) != 0) {
869 #ifdef PTHREAD_SETS_ERRNO
872 ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
877 requests_this_child = max_requests_per_child;
879 /* Set up the pollfd array, num_listenfds + 1 for the pipe and 1 for
882 listenfds = ap_pcalloc(pchild, sizeof(*listenfds) * (num_listenfds + 2));
883 #if APR_FILES_AS_SOCKETS
884 ap_socket_from_file(&listenfds[0], pipe_of_death_in);
887 /* The child socket */
888 ap_put_os_sock(&listenfds[1], &child_info_table[child_num].sd, pchild);
891 for (lr = ap_listeners, i = 2; i <= num_listenfds; lr = lr->next, ++i)
894 /* Setup worker threads */
896 if (threads_to_start > max_threads) {
897 threads_to_start = max_threads;
899 idle_thread_count = threads_to_start;
900 worker_thread_count = 0;
901 for (i = 0; i < max_threads; i++) {
902 worker_thread_free_ids[i] = i;
904 ap_create_pool(&thread_pool_parent, pchild);
905 pthread_mutex_init(&thread_pool_parent_mutex, NULL);
906 pthread_mutex_init(&idle_thread_count_mutex, NULL);
907 pthread_mutex_init(&worker_thread_count_mutex, NULL);
908 pthread_mutex_init(&pipe_of_death_mutex, NULL);
909 pthread_attr_init(&worker_thread_attr);
910 #ifdef PTHREAD_ATTR_SETDETACHSTATE_ARG2_ADDR
914 pthread_attr_setdetachstate(&worker_thread_attr, &on);
917 pthread_attr_setdetachstate(&worker_thread_attr, PTHREAD_CREATE_DETACHED);
920 /* We are creating worker threads right now */
921 for (i=0; i < threads_to_start; i++) {
922 /* start_thread shouldn't fail here */
923 if (!start_thread()) {
928 /* This thread will be the one responsible for handling signals */
929 sigemptyset(&sig_mask);
930 sigaddset(&sig_mask, SIGTERM);
931 sigaddset(&sig_mask, SIGINT);
932 ap_sigwait(&sig_mask, &signal_received);
933 switch (signal_received) {
936 just_die(signal_received);
939 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf,
940 "received impossible signal: %d", signal_received);
945 static int make_child(server_rec *s, int slot, time_t now)
949 if (slot + 1 > ap_max_daemons_limit) {
950 ap_max_daemons_limit = slot + 1;
955 ap_child_table[slot].pid = getpid();
956 ap_child_table[slot].status = SERVER_ALIVE;
960 if ((pid = fork()) == -1) {
961 ap_log_error(APLOG_MARK, APLOG_ERR, errno, s,
962 "fork: Unable to fork new process");
963 /* In case system resources are maxxed out, we don't want
964 Apache running away with the CPU trying to fork over and
965 over and over again. */
972 #ifdef AIX_BIND_PROCESSOR
973 /* By default, AIX binds to a single processor. This bit unbinds
974 children which will then bind to another CPU.
976 #include <sys/processor.h>
977 int status = bindprocessor(BINDPROCESS, (int)getpid(),
978 PROCESSOR_CLASS_ANY);
980 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, errno,
981 ap_server_conf, "processor unbind failed %d", status);
984 RAISE_SIGSTOP(MAKE_CHILD);
986 /* XXX - For an unthreaded server, a signal handler will be necessary
987 ap_signal(SIGTERM, just_die);
994 ap_child_table[slot].pid = pid;
995 ap_child_table[slot].status = SERVER_ALIVE;
1000 /* start up a bunch of children */
1001 static int startup_children(int number_to_start)
1005 for (i = 0; number_to_start && i < num_daemons; ++i) {
1006 if (ap_child_table[i].pid) {
1009 if (make_child(ap_server_conf, i, 0) < 0) {
1014 return number_to_start;
1019 * spawn_rate is the number of children that will be spawned on the
1020 * next maintenance cycle if there aren't enough servers. It is
1021 * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
1022 * without the need to spawn.
1024 static int spawn_rate = 1;
1025 #ifndef MAX_SPAWN_RATE
1026 #define MAX_SPAWN_RATE (32)
1028 static int hold_off_on_exponential_spawning;
1030 static void perform_child_maintenance(void)
1035 int free_slots[MAX_SPAWN_RATE];
1036 int last_non_dead = -1;
1038 /* initialize the free_list */
1041 for (i = 0; i < num_daemons; ++i) {
1042 if (ap_child_table[i].pid == 0) {
1043 if (free_length < spawn_rate) {
1044 free_slots[free_length] = i;
1052 if (i >= ap_max_daemons_limit && free_length >= spawn_rate) {
1056 ap_max_daemons_limit = last_non_dead + 1;
1058 if (free_length > 0) {
1059 for (i = 0; i < free_length; ++i) {
1060 make_child(ap_server_conf, free_slots[i], now);
1062 /* the next time around we want to spawn twice as many if this
1063 * wasn't good enough, but not if we've just done a graceful
1065 if (hold_off_on_exponential_spawning) {
1066 --hold_off_on_exponential_spawning;
1068 else if (spawn_rate < MAX_SPAWN_RATE) {
1077 static void server_main_loop(int remaining_children_to_start)
1084 while (!restart_pending && !shutdown_pending) {
1085 ap_wait_or_timeout(&status, &pid, pconf);
1087 if (pid.pid != -1) {
1088 ap_process_child_status(&pid, status);
1089 /* non-fatal death... note that it's gone in the child table and
1090 * clean out the status table. */
1092 for (i = 0; i < ap_max_daemons_limit; ++i) {
1093 if (ap_child_table[i].pid == pid.pid) {
1097 for (j = 0; j < HARD_THREAD_LIMIT; j++) {
1098 ap_perchild_force_reset_connection_status(i * HARD_THREAD_LIMIT + j);
1103 if (child_slot >= 0) {
1104 ap_child_table[child_slot].pid = 0;
1106 if (remaining_children_to_start
1107 && child_slot < num_daemons) {
1108 /* we're still doing a 1-for-1 replacement of dead
1109 * children with new children
1111 make_child(ap_server_conf, child_slot, time(NULL));
1112 --remaining_children_to_start;
1114 #if APR_HAS_OTHER_CHILD
1116 else if (ap_reap_other_child(&pid, status) == 0) {
1120 else if (is_graceful) {
1121 /* Great, we've probably just lost a slot in the
1122 * child table. Somehow we don't know about this
1125 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0,
1127 "long lost child came home! (pid %ld)",
1130 /* Don't perform idle maintenance when a child dies,
1131 * only do it when there's a timeout. Remember only a
1132 * finite number of children can die, and it's pretty
1133 * pathological for a lot to die suddenly.
1137 else if (remaining_children_to_start) {
1138 /* we hit a 1 second timeout in which none of the previous
1139 * generation of children needed to be reaped... so assume
1140 * they're all done, and pick up the slack if any is left.
1142 remaining_children_to_start = \
1143 startup_children(remaining_children_to_start);
1144 /* In any event we really shouldn't do the code below because
1145 * few of the servers we just started are in the IDLE state
1146 * yet, so we'd mistakenly create an extra server.
1151 perform_child_maintenance();
1155 int ap_mpm_run(ap_pool_t *_pconf, ap_pool_t *plog, server_rec *s)
1157 int remaining_children_to_start;
1164 if ((rv = ap_create_pipe(&pipe_of_death_in, &pipe_of_death_out, pconf))
1166 ap_log_error(APLOG_MARK, APLOG_ERR, rv,
1167 (const server_rec*) ap_server_conf,
1168 "ap_create_pipe (pipe_of_death)");
1171 if ((rv = ap_set_pipe_timeout(pipe_of_death_in, 0)) != APR_SUCCESS) {
1172 ap_log_error(APLOG_MARK, APLOG_ERR, rv,
1173 (const server_rec*) ap_server_conf,
1174 "ap_set_pipe_timeout (pipe_of_death)");
1178 if ((num_listenfds = ap_setup_listeners(ap_server_conf)) < 1) {
1179 /* XXX: hey, what's the right way for the mpm to indicate a fatal error? */
1180 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, 0, s,
1181 "no listening sockets available, shutting down");
1184 ap_log_pid(pconf, ap_pid_fname);
1186 /* Create all of the sockets for the child processes. */
1187 for (i = 0; i <= socket_num; i++) {
1191 sd = create_child_socket(i, pchild);
1194 if (child_info_table[j].num == i) {
1195 child_info_table[j].sd = sd;
1202 if (j >= num_daemons) {
1207 /* Initialize cross-process accept lock */
1208 lock_fname = ap_psprintf(_pconf, "%s.%u",
1209 ap_server_root_relative(_pconf, lock_fname),
1211 rv = SAFE_ACCEPT(ap_create_lock(&process_accept_mutex, APR_MUTEX,
1212 APR_CROSS_PROCESS, lock_fname, _pconf));
1213 if (rv != APR_SUCCESS) {
1214 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
1215 "Couldn't create cross-process lock");
1220 reinit_scoreboard(pconf);
1222 /* Initialize the child table */
1224 for (i = 0; i < HARD_SERVER_LIMIT; i++) {
1225 ap_child_table[i].pid = 0;
1231 /* If we're doing a graceful_restart then we're going to see a lot
1232 * of children exiting immediately when we get into the main loop
1233 * below (because we just sent them SIGWINCH). This happens pretty
1234 * rapidly... and for each one that exits we'll start a new one until
1235 * we reach at least daemons_min_free. But we may be permitted to
1236 * start more than that, so we'll just keep track of how many we're
1237 * supposed to start up without the 1 second penalty between each fork.
1239 remaining_children_to_start = num_daemons;
1241 remaining_children_to_start = \
1242 startup_children(remaining_children_to_start);
1245 /* give the system some time to recover before kicking into
1246 * exponential mode */
1247 hold_off_on_exponential_spawning = 10;
1250 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
1251 "%s configured -- resuming normal operations",
1252 ap_get_server_version());
1253 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, ap_server_conf,
1254 "Server built: %s", ap_get_server_built());
1255 restart_pending = shutdown_pending = 0;
1257 server_main_loop(remaining_children_to_start);
1259 if (shutdown_pending) {
1260 /* Time to gracefully shut down:
1261 * Kill child processes, tell them to call child_exit, etc...
1263 if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
1264 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf,
1267 ap_reclaim_child_processes(1); /* Start with SIGTERM */
1269 /* cleanup pid file on normal shutdown */
1271 const char *pidfile = NULL;
1272 pidfile = ap_server_root_relative (pconf, ap_pid_fname);
1273 if ( pidfile != NULL && unlink(pidfile) == 0)
1274 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0,
1276 "removed PID file %s (pid=%ld)",
1277 pidfile, (long)getpid());
1280 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0,
1281 ap_server_conf, "caught SIGTERM, shutting down");
1286 /* we've been told to restart */
1287 ap_signal(SIGHUP, SIG_IGN);
1290 /* not worth thinking about */
1295 char char_of_death = '!';
1297 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
1298 "SIGWINCH received. Doing graceful restart");
1300 /* This is mostly for debugging... so that we know what is still
1301 * gracefully dealing with existing request.
1304 for (i = 0; i < num_daemons; ++i) {
1305 if (ap_child_table[i].pid) {
1306 ap_child_table[i].status = SERVER_DYING;
1309 /* give the children the signal to die */
1310 for (i = 0; i < num_daemons;) {
1311 if ((rv = ap_write(pipe_of_death_out, &char_of_death, &one)) != APR_SUCCESS) {
1312 if (ap_canonical_error(rv) == APR_EINTR) continue;
1313 ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf,
1314 "write pipe_of_death");
1320 /* Kill 'em all. Since the child acts the same on the parents SIGTERM
1321 * and a SIGHUP, we may as well use the same signal, because some user
1322 * pthreads are stealing signals from us left and right.
1324 if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
1325 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf,
1328 ap_reclaim_child_processes(1); /* Start with SIGTERM */
1329 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0,
1330 ap_server_conf, "SIGHUP received. Attempting to restart");
1335 static void perchild_pre_config(ap_pool_t *p, ap_pool_t *plog, ap_pool_t *ptemp)
1337 static int restart_num = 0;
1341 one_process = !!getenv("ONE_PROCESS");
1342 no_detach = !!getenv("NO_DETACH");
1344 /* sigh, want this only the second time around */
1345 if (restart_num++ == 1) {
1348 if (!one_process && !no_detach) {
1356 ap_listen_pre_config();
1357 num_daemons = DEFAULT_NUM_DAEMON;
1358 threads_to_start = DEFAULT_START_THREAD;
1359 min_spare_threads = DEFAULT_MIN_SPARE_THREAD;
1360 max_spare_threads = DEFAULT_MAX_SPARE_THREAD;
1361 max_threads = HARD_THREAD_LIMIT;
1362 ap_pid_fname = DEFAULT_PIDLOG;
1363 ap_scoreboard_fname = DEFAULT_SCOREBOARD;
1364 lock_fname = DEFAULT_LOCKFILE;
1365 max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
1366 ap_perchild_set_maintain_connection_status(1);
1370 ap_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
1372 for (i = 0; i < HARD_SERVER_LIMIT; i++) {
1373 child_info_table[i].uid = -1;
1374 child_info_table[i].gid = -1;
1375 child_info_table[i].name = NULL;
1376 child_info_table[i].num = -1;
1380 static void perchild_post_config(ap_pool_t *p, ap_pool_t *plog, ap_pool_t *ptemp, server_rec *s)
1384 for (i = 0; i < num_daemons; i++) {
1385 if (child_info_table[i].name == NULL) {
1386 child_info_table[i].name = ap_pstrdup(p, "DEFAULT");
1387 child_info_table[i].num = socket_num;
1392 static int perchild_post_read(request_rec *r)
1394 const char *hostname = ap_table_get(r->headers_in, "Host");
1398 fprintf(stderr, "In perchild_post_read\n");
1400 process_num = ap_hash_get(socket_info_table, hostname, 0);
1402 num = atoi(process_num);
1408 if (num != child_info_table[child_num].num) {
1409 /* package the request and send it to another child */
1410 fprintf(stderr, "leaving DECLINED %d %d\n", num, child_num);
1417 static void perchild_hooks(void)
1422 ap_hook_pre_config(perchild_pre_config, NULL, NULL, AP_HOOK_MIDDLE);
1423 ap_hook_post_config(perchild_post_config, NULL, NULL, AP_HOOK_MIDDLE);
1424 /* This must be run absolutely first. If this request isn't for this
1425 * server then we need to forward it to the proper child. No sense
1426 * tying up this server running more post_read request hooks if it is
1427 * just going to be forwarded along.
1429 ap_hook_post_read_request(perchild_post_read, NULL, NULL, AP_HOOK_REALLY_FIRST);
1432 static const char *set_pidfile(cmd_parms *cmd, void *dummy, const char *arg)
1434 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1439 if (cmd->server->is_virtual) {
1440 return "PidFile directive not allowed in <VirtualHost>";
1446 static const char *set_scoreboard(cmd_parms *cmd, void *dummy, const char *arg)
1448 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1453 ap_scoreboard_fname = arg;
1457 static const char *set_lockfile(cmd_parms *cmd, void *dummy, const char *arg)
1459 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1467 static const char *set_num_daemons (cmd_parms *cmd, void *dummy, const char *arg)
1469 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1474 num_daemons = atoi(arg);
1475 if (num_daemons > HARD_SERVER_LIMIT) {
1476 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1477 "WARNING: NumServers of %d exceeds compile time limit "
1478 "of %d servers,", num_daemons, HARD_SERVER_LIMIT);
1479 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1480 " lowering NumServers to %d. To increase, please "
1481 "see the", HARD_SERVER_LIMIT);
1482 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1483 " HARD_SERVER_LIMIT define in %s.",
1484 AP_MPM_HARD_LIMITS_FILE);
1485 num_daemons = HARD_SERVER_LIMIT;
1487 else if (num_daemons < 1) {
1488 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1489 "WARNING: Require NumServers > 0, setting to 1");
1495 static const char *set_threads_to_start (cmd_parms *cmd, void *dummy, const char *arg)
1497 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1502 threads_to_start = atoi(arg);
1503 if (threads_to_start > HARD_THREAD_LIMIT) {
1504 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1505 "WARNING: StartThreads of %d exceeds compile time"
1506 " limit of %d threads,", threads_to_start,
1508 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1509 " lowering StartThreads to %d. To increase, please"
1510 " see the", HARD_THREAD_LIMIT);
1511 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1512 " HARD_THREAD_LIMIT define in %s.",
1513 AP_MPM_HARD_LIMITS_FILE);
1515 else if (threads_to_start < 1) {
1516 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1517 "WARNING: Require StartThreads > 0, setting to 1");
1518 threads_to_start = 1;
1523 static const char *set_min_spare_threads(cmd_parms *cmd, void *dummy, const char *arg)
1525 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1530 min_spare_threads = atoi(arg);
1531 if (min_spare_threads <= 0) {
1532 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1533 "WARNING: detected MinSpareThreads set to non-positive.");
1534 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1535 "Resetting to 1 to avoid almost certain Apache failure.");
1536 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1537 "Please read the documentation.");
1538 min_spare_threads = 1;
1544 static const char *set_max_spare_threads(cmd_parms *cmd, void *dummy, const char *arg)
1546 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1551 max_spare_threads = atoi(arg);
1552 if (max_spare_threads >= HARD_THREAD_LIMIT) {
1553 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1554 "WARNING: detected MinSpareThreads set higher than");
1555 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1556 "HARD_THREAD_LIMIT. Resetting to %d", HARD_THREAD_LIMIT);
1557 max_spare_threads = HARD_THREAD_LIMIT;
1562 static const char *set_max_threads(cmd_parms *cmd, void *dummy, const char *arg)
1564 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1569 max_threads = atoi(arg);
1570 if (max_threads > HARD_THREAD_LIMIT) {
1571 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1572 "WARNING: detected MaxThreadsPerChild set higher than");
1573 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1574 "HARD_THREAD_LIMIT. Resetting to %d", HARD_THREAD_LIMIT);
1575 max_threads = HARD_THREAD_LIMIT;
1580 static const char *set_max_requests(cmd_parms *cmd, void *dummy, const char *arg)
1582 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1587 max_requests_per_child = atoi(arg);
1592 static const char *set_maintain_connection_status(cmd_parms *cmd,
1593 void *dummy, int arg)
1595 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1600 ap_perchild_set_maintain_connection_status(arg != 0);
1604 static const char *set_coredumpdir (cmd_parms *cmd, void *dummy, const char *arg)
1608 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1613 fname = ap_server_root_relative(cmd->pool, arg);
1614 if ((ap_stat(&finfo, fname, cmd->pool) != APR_SUCCESS) ||
1615 (finfo.filetype != APR_DIR)) {
1616 return ap_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
1617 " does not exist or is not a directory", NULL);
1619 ap_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir));
1623 static const char *set_child_per_uid(cmd_parms *cmd, void *dummy, const char *u,
1624 const char *g, const char *num)
1627 int max_this_time = atoi(num) + curr_child_num;
1628 for (i = curr_child_num; i < max_this_time; i++, curr_child_num++); {
1629 child_info_t *ug = &child_info_table[i - 1];
1631 if (i > num_daemons) {
1632 return "Trying to use more child ID's than NumServers. Increase "
1633 "NumServers in your config file.";
1638 ug->name = ap_pstrcat(cmd->pool, u, ":", g, NULL);
1639 ug->num = socket_num;
1645 static const char *set_socket_name(cmd_parms *cmd, void *dummy, const char *arg)
1647 server_rec *s = cmd->server;
1648 perchild_server_conf *conf = (perchild_server_conf *)
1649 ap_get_module_config(s->module_config, &mpm_perchild_module);
1651 conf->sockname = ap_server_root_relative(cmd->pool, arg);
1655 static ap_status_t cleanup_hash(void *dptr)
1657 socket_info_table = NULL;
1661 static const char *assign_childuid(cmd_parms *cmd, void *dummy, const char *uid,
1664 char *socketname = ap_pstrcat(cmd->pool, uid, ":", gid, NULL);
1665 if (socket_info_table == NULL) {
1666 socket_info_table = ap_make_hash(cmd->pool);
1667 ap_register_cleanup(cmd->pool, socket_info_table, cleanup_hash, NULL);
1669 ap_hash_set(socket_info_table, cmd->server->server_hostname, 0, socketname);
1674 static const command_rec perchild_cmds[] = {
1675 UNIX_DAEMON_COMMANDS
1677 AP_INIT_TAKE1("PidFile", set_pidfile, NULL, RSRC_CONF,
1678 "A file for logging the server process ID"),
1679 AP_INIT_TAKE1("ScoreBoardFile", set_scoreboard, NULL, RSRC_CONF,
1680 "A file for Apache to maintain runtime process management information"),
1681 AP_INIT_TAKE1("LockFile", set_lockfile, NULL, RSRC_CONF,
1682 "The lockfile used when Apache needs to lock the accept() call"),
1683 AP_INIT_TAKE1("NumServers", set_num_daemons, NULL, RSRC_CONF,
1684 "Number of children alive at the same time"),
1685 AP_INIT_TAKE1("StartThreads", set_threads_to_start, NULL, RSRC_CONF,
1686 "Number of threads each child creates"),
1687 AP_INIT_TAKE1("MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF,
1688 "Minimum number of idle threads per child, to handle request spikes"),
1689 AP_INIT_TAKE1("MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF,
1690 "Maximum number of idle threads per child"),
1691 AP_INIT_TAKE1("MaxThreadsPerChild", set_max_threads, NULL, RSRC_CONF,
1692 "Maximum number of threads per child"),
1693 AP_INIT_TAKE1("MaxRequestsPerChild", set_max_requests, NULL, RSRC_CONF,
1694 "Maximum number of requests a particular child serves before dying."),
1695 AP_INIT_FLAG("ConnectionStatus", set_maintain_connection_status, NULL, RSRC_CONF,
1696 "Whether or not to maintain status information on current connections"),
1697 AP_INIT_TAKE1("CoreDumpDirectory", set_coredumpdir, NULL, RSRC_CONF,
1698 "The location of the directory Apache changes to before dumping core"),
1699 AP_INIT_TAKE3("ChildperUserID", set_child_per_uid, NULL, RSRC_CONF,
1700 "Specify a User and Group for a specific child process."),
1701 AP_INIT_TAKE2("AssignUserID", assign_childuid, NULL, RSRC_CONF,
1702 "Tie a virtual host to a specific child process."),
1703 AP_INIT_TAKE1("ChildSockName", set_socket_name, NULL, RSRC_CONF,
1704 "the base name of the socket to use for communication between "
1705 "child processes. The actual socket will be "
1706 "basename.childnum"),
1710 static void *perchild_create_config(ap_pool_t *p, server_rec *s)
1712 perchild_server_conf *c =
1713 (perchild_server_conf *) ap_pcalloc(p, sizeof(perchild_server_conf));
1715 c->sockname = ap_server_root_relative(p, DEFAULT_PERCHILD_SOCKET);
1719 module MODULE_VAR_EXPORT mpm_perchild_module = {
1721 NULL, /* hook to run before apache parses args */
1722 NULL, /* create per-directory config structure */
1723 NULL, /* merge per-directory config structures */
1724 perchild_create_config, /* create per-server config structure */
1725 NULL, /* merge per-server config structures */
1726 perchild_cmds, /* command ap_table_t */
1727 NULL, /* handlers */
1728 perchild_hooks /* register_hooks */