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>
101 * Actual definitions of config globals
104 static int threads_to_start = 0; /* Worker threads per child */
105 static int min_spare_threads = 0;
106 static int max_spare_threads = 0;
107 static int max_threads = 0;
108 static int max_requests_per_child = 0;
109 static const char *ap_pid_fname=NULL;
110 API_VAR_EXPORT const char *ap_scoreboard_fname=NULL;
111 static int num_daemons=0;
112 static int curr_child_num=0;
113 static int socket_num=0;
114 static int workers_may_exit = 0;
115 static int requests_this_child;
116 static int num_listenfds = 0;
117 static apr_socket_t **listenfds;
118 static jmp_buf jmpbuffer;
120 struct child_info_t {
129 } perchild_server_conf;
131 typedef struct child_info_t child_info_t;
132 typedef struct socket_info_t socket_info_t;
134 /* Tables used to determine the user and group each child process should
135 * run as. The hash table is used to correlate a server name with a child
138 static child_info_t child_info_table[HARD_SERVER_LIMIT];
139 static int thread_socket_table[HARD_THREAD_LIMIT];
142 struct ap_ctable ap_child_table[HARD_SERVER_LIMIT];
145 * The max child slot ever assigned, preserved across restarts. Necessary
146 * to deal with NumServers changes across SIGWINCH restarts. We use this
147 * value to optimize routines that have to scan the entire child table.
149 * XXX - It might not be worth keeping this code in. There aren't very
150 * many child processes in this MPM.
152 int ap_max_daemons_limit = -1;
154 char ap_coredump_dir[MAX_STRING_LEN];
156 module MODULE_VAR_EXPORT mpm_perchild_module;
158 static apr_file_t *pipe_of_death_in = NULL;
159 static apr_file_t *pipe_of_death_out = NULL;
160 static pthread_mutex_t pipe_of_death_mutex;
162 /* *Non*-shared http_main globals... */
164 server_rec *ap_server_conf;
166 /* one_process --- debugging mode variable; can be set from the command line
167 * with the -X flag. If set, this gets you the child_main loop running
168 * in the process which originally started up (no detach, no make_child),
169 * which is a pretty nice debugging environment. (You'll get a SIGHUP
170 * early in standalone_main; just continue through. This is the server
171 * trying to kill off any child processes which it might have lying
172 * around --- Apache doesn't keep track of their pids, it just sends
173 * SIGHUP to the process group, ignoring it in the root process.
174 * Continue through and you'll be fine.).
177 static int one_process = 0;
180 int raise_sigstop_flags;
183 static apr_pool_t *pconf; /* Pool for config stuff */
184 static apr_pool_t *pchild; /* Pool for httpd child stuff */
185 static apr_pool_t *thread_pool_parent; /* Parent of per-thread pools */
186 static pthread_mutex_t thread_pool_parent_mutex;
188 static int child_num;
189 static unsigned int my_pid; /* Linux getpid() doesn't work except in
190 main thread. Use this instead */
191 /* Keep track of the number of worker threads currently active */
192 static int worker_thread_count;
193 static pthread_mutex_t worker_thread_count_mutex;
194 static int worker_thread_free_ids[HARD_THREAD_LIMIT];
195 static pthread_attr_t worker_thread_attr;
197 /* Keep track of the number of idle worker threads */
198 static int idle_thread_count;
199 static pthread_mutex_t idle_thread_count_mutex;
201 /* Locks for accept serialization */
202 #ifdef NO_SERIALIZED_ACCEPT
203 #define SAFE_ACCEPT(stmt) APR_SUCCESS
205 #define SAFE_ACCEPT(stmt) (stmt)
206 static apr_lock_t *process_accept_mutex;
207 #endif /* NO_SERIALIZED_ACCEPT */
208 static const char *lock_fname;
209 static pthread_mutex_t thread_accept_mutex = PTHREAD_MUTEX_INITIALIZER;
211 API_EXPORT(int) ap_get_max_daemons(void)
213 return ap_max_daemons_limit;
216 /* a clean exit from a child with proper cleanup */
217 static void clean_child_exit(int code)
220 apr_destroy_pool(pchild);
225 /* handle all varieties of core dumping signals */
226 static void sig_coredump(int sig)
228 chdir(ap_coredump_dir);
229 apr_signal(sig, SIG_DFL);
231 /* At this point we've got sig blocked, because we're still inside
232 * the signal handler. When we leave the signal handler it will
233 * be unblocked, and we'll take the signal... and coredump or whatever
234 * is appropriate for this particular Unix. In addition the parent
235 * will see the real signal we received -- whereas if we called
236 * abort() here, the parent would only see SIGABRT.
240 static void just_die(int sig)
245 /*****************************************************************
246 * Connection structures and accounting...
249 /* volatile just in case */
250 static int volatile shutdown_pending;
251 static int volatile restart_pending;
252 static int volatile is_graceful;
255 * ap_start_shutdown() and ap_start_restart(), below, are a first stab at
256 * functions to initiate shutdown or restart without relying on signals.
257 * Previously this was initiated in sig_term() and restart() signal handlers,
258 * but we want to be able to start a shutdown/restart from other sources --
259 * e.g. on Win32, from the service manager. Now the service manager can
260 * call ap_start_shutdown() or ap_start_restart() as appropiate. Note that
261 * these functions can also be called by the child processes, since global
262 * variables are no longer used to pass on the required action to the parent.
264 * These should only be called from the parent process itself, since the
265 * parent process will use the shutdown_pending and restart_pending variables
266 * to determine whether to shutdown or restart. The child process should
267 * call signal_parent() directly to tell the parent to die -- this will
268 * cause neither of those variable to be set, which the parent will
269 * assume means something serious is wrong (which it will be, for the
270 * child to force an exit) and so do an exit anyway.
273 void ap_start_shutdown(void)
275 if (shutdown_pending == 1) {
276 /* Um, is this _probably_ not an error, if the user has
277 * tried to do a shutdown twice quickly, so we won't
278 * worry about reporting it.
282 shutdown_pending = 1;
285 /* do a graceful restart if graceful == 1 */
286 static void ap_start_restart(int graceful)
289 if (restart_pending == 1) {
290 /* Probably not an error - don't bother reporting it */
294 is_graceful = graceful;
296 apr_kill_cleanup(pconf, NULL, ap_cleanup_shared_mem);
300 static void sig_term(int sig)
305 static void restart(int sig)
308 ap_start_restart(sig == SIGWINCH);
314 static void set_signals(void)
316 #ifndef NO_USE_SIGACTION
319 sigemptyset(&sa.sa_mask);
323 sa.sa_handler = sig_coredump;
324 #if defined(SA_ONESHOT)
325 sa.sa_flags = SA_ONESHOT;
326 #elif defined(SA_RESETHAND)
327 sa.sa_flags = SA_RESETHAND;
329 if (sigaction(SIGSEGV, &sa, NULL) < 0)
330 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGSEGV)");
332 if (sigaction(SIGBUS, &sa, NULL) < 0)
333 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGBUS)");
336 if (sigaction(SIGABORT, &sa, NULL) < 0)
337 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABORT)");
340 if (sigaction(SIGABRT, &sa, NULL) < 0)
341 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABRT)");
344 if (sigaction(SIGILL, &sa, NULL) < 0)
345 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGILL)");
349 sa.sa_handler = sig_term;
350 if (sigaction(SIGTERM, &sa, NULL) < 0)
351 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGTERM)");
353 if (sigaction(SIGINT, &sa, NULL) < 0)
354 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGINT)");
357 sa.sa_handler = SIG_DFL;
358 if (sigaction(SIGXCPU, &sa, NULL) < 0)
359 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGXCPU)");
362 sa.sa_handler = SIG_DFL;
363 if (sigaction(SIGXFSZ, &sa, NULL) < 0)
364 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGXFSZ)");
367 sa.sa_handler = SIG_IGN;
368 if (sigaction(SIGPIPE, &sa, NULL) < 0)
369 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGPIPE)");
372 /* we want to ignore HUPs and WINCH while we're busy processing one */
373 sigaddset(&sa.sa_mask, SIGHUP);
374 sigaddset(&sa.sa_mask, SIGWINCH);
375 sa.sa_handler = restart;
376 if (sigaction(SIGHUP, &sa, NULL) < 0)
377 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGHUP)");
378 if (sigaction(SIGWINCH, &sa, NULL) < 0)
379 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGWINCH)");
382 apr_signal(SIGSEGV, sig_coredump);
384 apr_signal(SIGBUS, sig_coredump);
387 apr_signal(SIGABORT, sig_coredump);
388 #endif /* SIGABORT */
390 apr_signal(SIGABRT, sig_coredump);
393 apr_signal(SIGILL, sig_coredump);
396 apr_signal(SIGXCPU, SIG_DFL);
399 apr_signal(SIGXFSZ, SIG_DFL);
403 apr_signal(SIGTERM, sig_term);
405 apr_signal(SIGHUP, restart);
408 apr_signal(SIGWINCH, restart);
409 #endif /* SIGWINCH */
411 apr_signal(SIGPIPE, SIG_IGN);
417 /*****************************************************************
418 * Here follows a long bunch of generic server bookkeeping stuff...
421 int ap_graceful_stop_signalled(void)
423 /* XXX - Does this really work? - Manoj */
427 /*****************************************************************
428 * Child process main loop.
431 static void process_socket(apr_pool_t *p, apr_socket_t *sock, long conn_id)
434 conn_rec *current_conn;
439 if ((rv = apr_get_os_sock(&csd, sock)) != APR_SUCCESS) {
440 ap_log_error(APLOG_MARK, APLOG_ERR, rv, NULL, "apr_get_os_sock");
443 if (csd >= FD_SETSIZE) {
444 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, NULL,
445 "new file descriptor %d is too large; you probably need "
446 "to rebuild Apache with a larger FD_SETSIZE "
449 apr_close_socket(sock);
453 ap_sock_disable_nagle(csd);
454 iol = ap_iol_attach_socket(p, sock);
455 conn_io = ap_bcreate(p, B_RDWR);
456 ap_bpush_iol(conn_io, iol);
458 current_conn = ap_new_apr_connection(p, ap_server_conf, conn_io, sock,
461 ap_process_connection(current_conn);
462 ap_lingering_close(current_conn);
465 static void *worker_thread(void *);
467 /* Starts a thread as long as we're below max_threads */
468 static int start_thread(void)
473 pthread_mutex_lock(&worker_thread_count_mutex);
474 if (worker_thread_count < max_threads) {
475 if ((rc = pthread_create(&thread, &worker_thread_attr, worker_thread,
476 &worker_thread_free_ids[worker_thread_count]))) {
477 #ifdef PTHREAD_SETS_ERRNO
480 ap_log_error(APLOG_MARK, APLOG_ALERT, rc, ap_server_conf,
481 "pthread_create: unable to create worker thread");
482 /* In case system resources are maxxed out, we don't want
483 Apache running away with the CPU trying to fork over and
484 over and over again if we exit. */
486 workers_may_exit = 1;
487 pthread_mutex_unlock(&worker_thread_count_mutex);
491 worker_thread_count++;
495 static int reported = 0;
498 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, ap_server_conf,
499 "server reached MaxThreadsPerChild setting, consider raising the"
500 " MaxThreadsPerChild or NumServers settings");
503 pthread_mutex_unlock(&worker_thread_count_mutex);
506 pthread_mutex_unlock(&worker_thread_count_mutex);
510 /* Sets workers_may_exit if we received a character on the pipe_of_death */
511 static void check_pipe_of_death(void)
513 pthread_mutex_lock(&pipe_of_death_mutex);
514 if (!workers_may_exit) {
519 ret = apr_recv(listenfds[0], &pipe_read_char, &n);
520 if (apr_canonical_error(ret) == APR_EAGAIN) {
521 /* It lost the lottery. It must continue to suffer
522 * through a life of servitude. */
525 /* It won the lottery (or something else is very
526 * wrong). Embrace death with open arms. */
527 workers_may_exit = 1;
530 pthread_mutex_unlock(&pipe_of_death_mutex);
533 /* idle_thread_count should be incremented before starting a worker_thread */
535 static void *worker_thread(void *arg)
537 apr_socket_t *csd = NULL;
538 apr_pool_t *tpool; /* Pool for this thread */
539 apr_pool_t *ptrans; /* Pool for per-transaction stuff */
540 apr_socket_t *sd = NULL;
542 int curr_pollfd, last_pollfd = 0;
543 int thread_just_started = 1;
544 int thread_num = *((int *) arg);
545 long conn_id = child_num * HARD_THREAD_LIMIT + thread_num;
546 apr_pollfd_t *pollset;
550 pthread_mutex_lock(&thread_pool_parent_mutex);
551 apr_create_pool(&tpool, thread_pool_parent);
552 pthread_mutex_unlock(&thread_pool_parent_mutex);
553 apr_create_pool(&ptrans, tpool);
555 apr_setup_poll(&pollset, num_listenfds+1, tpool);
556 for(n=0 ; n <= num_listenfds ; ++n) {
557 apr_add_poll_socket(pollset, listenfds[n], APR_POLLIN);
560 while (!workers_may_exit) {
561 workers_may_exit |= (max_requests_per_child != 0) && (requests_this_child <= 0);
562 if (workers_may_exit) break;
563 if (!thread_just_started) {
564 pthread_mutex_lock(&idle_thread_count_mutex);
565 if (idle_thread_count < max_spare_threads) {
567 pthread_mutex_unlock(&idle_thread_count_mutex);
570 pthread_mutex_unlock(&idle_thread_count_mutex);
575 thread_just_started = 0;
577 pthread_mutex_lock(&thread_accept_mutex);
578 if (workers_may_exit) {
579 pthread_mutex_unlock(&thread_accept_mutex);
582 if ((rv = SAFE_ACCEPT(apr_lock(process_accept_mutex)))
584 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
585 "apr_lock failed. Attempting to shutdown "
586 "process gracefully.");
587 workers_may_exit = 1;
590 while (!workers_may_exit) {
592 srv = apr_poll(pollset, &n, -1);
594 if (srv != APR_SUCCESS) {
595 if (apr_canonical_error(srv) == APR_EINTR) {
599 /* apr_poll() will only return errors in catastrophic
600 * circumstances. Let's try exiting gracefully, for now. */
601 ap_log_error(APLOG_MARK, APLOG_ERR, srv, (const server_rec *)
602 ap_server_conf, "apr_poll: (listen)");
603 workers_may_exit = 1;
605 if (workers_may_exit) break;
607 apr_get_revents(&event, listenfds[0], pollset);
608 if (event & APR_POLLIN) {
609 /* A process got a signal on the shutdown pipe. Check if we're
610 * the lucky process to die. */
611 check_pipe_of_death();
615 apr_get_revents(&event, listenfds[1], pollset);
616 if (event & APR_POLLIN) {
617 /* This request is from another child in our current process.
618 * We should set a flag here, and then below we will read
619 * two bytes (the socket number and the NULL byte.
621 fprintf(stderr, " I just got a response from a different child process. :-0\n");
623 thread_socket_table[thread_num] = -2;
626 if (num_listenfds == 1) {
627 sd = ap_listeners->sd;
631 /* find a listener */
632 curr_pollfd = last_pollfd;
635 if (curr_pollfd > num_listenfds) {
638 /* XXX: Should we check for POLLERR? */
639 apr_get_revents(&event, listenfds[curr_pollfd], pollset);
640 if (event & APR_POLLIN) {
641 last_pollfd = curr_pollfd;
642 sd = listenfds[curr_pollfd];
645 } while (curr_pollfd != last_pollfd);
649 if (!workers_may_exit) {
650 if ((rv = apr_accept(&csd, sd, ptrans)) != APR_SUCCESS) {
651 ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, "apr_accept");
653 if ((rv = SAFE_ACCEPT(apr_unlock(process_accept_mutex)))
655 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
656 "apr_unlock failed. Attempting to shutdown "
657 "process gracefully.");
658 workers_may_exit = 1;
660 pthread_mutex_unlock(&thread_accept_mutex);
661 pthread_mutex_lock(&idle_thread_count_mutex);
662 if (idle_thread_count > min_spare_threads) {
666 if (!start_thread()) {
670 pthread_mutex_unlock(&idle_thread_count_mutex);
671 if (thread_socket_table[thread_num] == -2) {
674 struct strrecvfd recvfd;
675 fprintf(stderr, "Got a request from a different child\n");
678 apr_get_os_sock(&sd, csd);
679 ioctl(sd, I_RECVFD, &recvfd);
682 ioctl(pd, I_RECVFD, &recvfd);
684 thread_socket_table[thread_num] = recvfd.fd;
686 if (setjmp(jmpbuffer) != 1) {
687 process_socket(ptrans, csd, conn_id);
690 thread_socket_table[thread_num] = -1;
692 requests_this_child--;
694 if ((rv = SAFE_ACCEPT(apr_unlock(process_accept_mutex)))
696 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
697 "apr_unlock failed. Attempting to shutdown "
698 "process gracefully.");
699 workers_may_exit = 1;
701 pthread_mutex_unlock(&thread_accept_mutex);
702 pthread_mutex_lock(&idle_thread_count_mutex);
704 pthread_mutex_unlock(&idle_thread_count_mutex);
707 apr_clear_pool(ptrans);
710 pthread_mutex_lock(&thread_pool_parent_mutex);
711 apr_destroy_pool(tpool);
712 pthread_mutex_unlock(&thread_pool_parent_mutex);
713 pthread_mutex_lock(&worker_thread_count_mutex);
714 worker_thread_count--;
715 worker_thread_free_ids[worker_thread_count] = thread_num;
716 if (worker_thread_count == 0) {
717 /* All the threads have exited, now finish the shutdown process
718 * by signalling the sigwait thread */
719 kill(my_pid, SIGTERM);
721 pthread_mutex_unlock(&worker_thread_count_mutex);
726 /* Set group privileges.
728 * Note that we use the username as set in the config files, rather than
729 * the lookup of to uid --- the same uid may have multiple passwd entries,
730 * with different sets of groups for each.
733 static int set_group_privs(uid_t uid, gid_t gid)
738 /* Get username if passed as a uid */
742 if ((ent = getpwuid(uid)) == NULL) {
743 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
744 "getpwuid: couldn't determine user name from uid %u, "
745 "you probably need to modify the User directive",
753 * Set the GID before initgroups(), since on some platforms
754 * setgid() is known to zap the group list.
756 if (setgid(gid) == -1) {
757 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
758 "setgid: unable to set group id to Group %u",
763 /* Reset `groups' attributes. */
765 if (initgroups(name, gid) == -1) {
766 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
767 "initgroups: unable to set groups for User %s "
768 "and Group %u", name, (unsigned)gid);
776 static int perchild_setup_child(int childnum)
778 child_info_t *ug = &child_info_table[childnum];
780 if (ug->uid == -1 && ug->gid == -1) {
781 return unixd_setup_child();
783 if (set_group_privs(ug->uid, ug->gid)) {
786 /* Only try to switch if we're running as root */
789 os_init_job_environment(server_conf, unixd_config.user_name, one_process) != 0 ||
791 setuid(ug->uid) == -1)) {
792 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
793 "setuid: unable to change to uid: %ld",
800 static void child_main(int child_num_arg)
809 child_num = child_num_arg;
810 apr_create_pool(&pchild, pconf);
812 /*stuff to do before we switch id's, so we have permissions.*/
814 rv = SAFE_ACCEPT(apr_child_init_lock(&process_accept_mutex, lock_fname,
816 if (rv != APR_SUCCESS) {
817 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
818 "Couldn't initialize cross-process lock in child");
819 clean_child_exit(APEXIT_CHILDFATAL);
822 if (perchild_setup_child(child_num)) {
823 clean_child_exit(APEXIT_CHILDFATAL);
826 ap_child_init_hook(pchild, ap_server_conf);
828 /*done with init critical section */
830 /* All threads should mask signals out, accoring to sigwait(2) man page */
831 sigfillset(&sig_mask);
833 #ifdef SIGPROCMASK_SETS_THREAD_MASK
834 if (sigprocmask(SIG_SETMASK, &sig_mask, NULL) != 0) {
835 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf, "sigprocmask");
838 if ((rv = pthread_sigmask(SIG_SETMASK, &sig_mask, NULL)) != 0) {
839 #ifdef PTHREAD_SETS_ERRNO
842 ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
847 requests_this_child = max_requests_per_child;
849 /* Set up the pollfd array, num_listenfds + 1 for the pipe and 1 for
852 listenfds = apr_pcalloc(pchild, sizeof(*listenfds) * (num_listenfds + 2));
853 #if APR_FILES_AS_SOCKETS
854 apr_socket_from_file(&listenfds[0], pipe_of_death_in);
857 /* The child socket */
858 apr_put_os_sock(&listenfds[1], &child_info_table[child_num].readpipe, pchild);
861 for (lr = ap_listeners, i = 2; i <= num_listenfds; lr = lr->next, ++i)
864 /* Setup worker threads */
866 if (threads_to_start > max_threads) {
867 threads_to_start = max_threads;
869 idle_thread_count = threads_to_start;
870 worker_thread_count = 0;
871 for (i = 0; i < max_threads; i++) {
872 worker_thread_free_ids[i] = i;
874 apr_create_pool(&thread_pool_parent, pchild);
875 pthread_mutex_init(&thread_pool_parent_mutex, NULL);
876 pthread_mutex_init(&idle_thread_count_mutex, NULL);
877 pthread_mutex_init(&worker_thread_count_mutex, NULL);
878 pthread_mutex_init(&pipe_of_death_mutex, NULL);
879 pthread_attr_init(&worker_thread_attr);
880 #ifdef PTHREAD_ATTR_SETDETACHSTATE_ARG2_ADDR
884 pthread_attr_setdetachstate(&worker_thread_attr, &on);
887 pthread_attr_setdetachstate(&worker_thread_attr, PTHREAD_CREATE_DETACHED);
890 /* We are creating worker threads right now */
891 for (i=0; i < threads_to_start; i++) {
892 /* start_thread shouldn't fail here */
893 if (!start_thread()) {
898 /* This thread will be the one responsible for handling signals */
899 sigemptyset(&sig_mask);
900 sigaddset(&sig_mask, SIGTERM);
901 sigaddset(&sig_mask, SIGINT);
902 ap_sigwait(&sig_mask, &signal_received);
903 switch (signal_received) {
906 just_die(signal_received);
909 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf,
910 "received impossible signal: %d", signal_received);
915 static int make_child(server_rec *s, int slot, time_t now)
919 if (slot + 1 > ap_max_daemons_limit) {
920 ap_max_daemons_limit = slot + 1;
925 ap_child_table[slot].pid = getpid();
926 ap_child_table[slot].status = SERVER_ALIVE;
930 if ((pid = fork()) == -1) {
931 ap_log_error(APLOG_MARK, APLOG_ERR, errno, s,
932 "fork: Unable to fork new process");
933 /* In case system resources are maxxed out, we don't want
934 Apache running away with the CPU trying to fork over and
935 over and over again. */
942 #ifdef AIX_BIND_PROCESSOR
943 /* By default, AIX binds to a single processor. This bit unbinds
944 children which will then bind to another CPU.
946 #include <sys/processor.h>
947 int status = bindprocessor(BINDPROCESS, (int)getpid(),
948 PROCESSOR_CLASS_ANY);
950 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, errno,
951 ap_server_conf, "processor unbind failed %d", status);
954 RAISE_SIGSTOP(MAKE_CHILD);
956 /* XXX - For an unthreaded server, a signal handler will be necessary
957 apr_signal(SIGTERM, just_die);
964 ap_child_table[slot].pid = pid;
965 ap_child_table[slot].status = SERVER_ALIVE;
970 /* start up a bunch of children */
971 static int startup_children(int number_to_start)
975 for (i = 0; number_to_start && i < num_daemons; ++i) {
976 if (ap_child_table[i].pid) {
979 if (make_child(ap_server_conf, i, 0) < 0) {
984 return number_to_start;
989 * spawn_rate is the number of children that will be spawned on the
990 * next maintenance cycle if there aren't enough servers. It is
991 * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
992 * without the need to spawn.
994 static int spawn_rate = 1;
995 #ifndef MAX_SPAWN_RATE
996 #define MAX_SPAWN_RATE (32)
998 static int hold_off_on_exponential_spawning;
1000 static void perform_child_maintenance(void)
1005 int free_slots[MAX_SPAWN_RATE];
1006 int last_non_dead = -1;
1008 /* initialize the free_list */
1011 for (i = 0; i < num_daemons; ++i) {
1012 if (ap_child_table[i].pid == 0) {
1013 if (free_length < spawn_rate) {
1014 free_slots[free_length] = i;
1022 if (i >= ap_max_daemons_limit && free_length >= spawn_rate) {
1026 ap_max_daemons_limit = last_non_dead + 1;
1028 if (free_length > 0) {
1029 for (i = 0; i < free_length; ++i) {
1030 make_child(ap_server_conf, free_slots[i], now);
1032 /* the next time around we want to spawn twice as many if this
1033 * wasn't good enough, but not if we've just done a graceful
1035 if (hold_off_on_exponential_spawning) {
1036 --hold_off_on_exponential_spawning;
1038 else if (spawn_rate < MAX_SPAWN_RATE) {
1047 static void server_main_loop(int remaining_children_to_start)
1054 while (!restart_pending && !shutdown_pending) {
1055 ap_wait_or_timeout(&status, &pid, pconf);
1057 if (pid.pid != -1) {
1058 ap_process_child_status(&pid, status);
1059 /* non-fatal death... note that it's gone in the child table and
1060 * clean out the status table. */
1062 for (i = 0; i < ap_max_daemons_limit; ++i) {
1063 if (ap_child_table[i].pid == pid.pid) {
1067 for (j = 0; j < HARD_THREAD_LIMIT; j++) {
1068 ap_perchild_force_reset_connection_status(i * HARD_THREAD_LIMIT + j);
1073 if (child_slot >= 0) {
1074 ap_child_table[child_slot].pid = 0;
1076 if (remaining_children_to_start
1077 && child_slot < num_daemons) {
1078 /* we're still doing a 1-for-1 replacement of dead
1079 * children with new children
1081 make_child(ap_server_conf, child_slot, time(NULL));
1082 --remaining_children_to_start;
1084 #if APR_HAS_OTHER_CHILD
1086 else if (apr_reap_other_child(&pid, status) == 0) {
1090 else if (is_graceful) {
1091 /* Great, we've probably just lost a slot in the
1092 * child table. Somehow we don't know about this
1095 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0,
1097 "long lost child came home! (pid %ld)",
1100 /* Don't perform idle maintenance when a child dies,
1101 * only do it when there's a timeout. Remember only a
1102 * finite number of children can die, and it's pretty
1103 * pathological for a lot to die suddenly.
1107 else if (remaining_children_to_start) {
1108 /* we hit a 1 second timeout in which none of the previous
1109 * generation of children needed to be reaped... so assume
1110 * they're all done, and pick up the slack if any is left.
1112 remaining_children_to_start = \
1113 startup_children(remaining_children_to_start);
1114 /* In any event we really shouldn't do the code below because
1115 * few of the servers we just started are in the IDLE state
1116 * yet, so we'd mistakenly create an extra server.
1121 perform_child_maintenance();
1125 int ap_mpm_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s)
1127 int remaining_children_to_start;
1130 apr_ssize_t one = 1;
1134 if ((rv = apr_create_pipe(&pipe_of_death_in, &pipe_of_death_out, pconf))
1136 ap_log_error(APLOG_MARK, APLOG_ERR, rv,
1137 (const server_rec*) ap_server_conf,
1138 "apr_create_pipe (pipe_of_death)");
1141 if ((rv = apr_set_pipe_timeout(pipe_of_death_in, 0)) != APR_SUCCESS) {
1142 ap_log_error(APLOG_MARK, APLOG_ERR, rv,
1143 (const server_rec*) ap_server_conf,
1144 "apr_set_pipe_timeout (pipe_of_death)");
1148 if ((num_listenfds = ap_setup_listeners(ap_server_conf)) < 1) {
1149 /* XXX: hey, what's the right way for the mpm to indicate a fatal error? */
1150 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, 0, s,
1151 "no listening sockets available, shutting down");
1154 ap_log_pid(pconf, ap_pid_fname);
1156 /* Initialize cross-process accept lock */
1157 lock_fname = apr_psprintf(_pconf, "%s.%u",
1158 ap_server_root_relative(_pconf, lock_fname),
1160 rv = SAFE_ACCEPT(apr_create_lock(&process_accept_mutex, APR_MUTEX,
1161 APR_CROSS_PROCESS, lock_fname, _pconf));
1162 if (rv != APR_SUCCESS) {
1163 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
1164 "Couldn't create cross-process lock");
1169 reinit_scoreboard(pconf);
1171 /* Initialize the child table */
1173 for (i = 0; i < HARD_SERVER_LIMIT; i++) {
1174 ap_child_table[i].pid = 0;
1180 /* If we're doing a graceful_restart then we're going to see a lot
1181 * of children exiting immediately when we get into the main loop
1182 * below (because we just sent them SIGWINCH). This happens pretty
1183 * rapidly... and for each one that exits we'll start a new one until
1184 * we reach at least daemons_min_free. But we may be permitted to
1185 * start more than that, so we'll just keep track of how many we're
1186 * supposed to start up without the 1 second penalty between each fork.
1188 remaining_children_to_start = num_daemons;
1190 remaining_children_to_start = \
1191 startup_children(remaining_children_to_start);
1194 /* give the system some time to recover before kicking into
1195 * exponential mode */
1196 hold_off_on_exponential_spawning = 10;
1199 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
1200 "%s configured -- resuming normal operations",
1201 ap_get_server_version());
1202 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, ap_server_conf,
1203 "Server built: %s", ap_get_server_built());
1204 restart_pending = shutdown_pending = 0;
1206 server_main_loop(remaining_children_to_start);
1208 if (shutdown_pending) {
1209 /* Time to gracefully shut down:
1210 * Kill child processes, tell them to call child_exit, etc...
1212 if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
1213 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf,
1216 ap_reclaim_child_processes(1); /* Start with SIGTERM */
1218 /* cleanup pid file on normal shutdown */
1220 const char *pidfile = NULL;
1221 pidfile = ap_server_root_relative (pconf, ap_pid_fname);
1222 if ( pidfile != NULL && unlink(pidfile) == 0)
1223 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0,
1225 "removed PID file %s (pid=%ld)",
1226 pidfile, (long)getpid());
1229 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0,
1230 ap_server_conf, "caught SIGTERM, shutting down");
1235 /* we've been told to restart */
1236 apr_signal(SIGHUP, SIG_IGN);
1239 /* not worth thinking about */
1244 char char_of_death = '!';
1246 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
1247 "SIGWINCH received. Doing graceful restart");
1249 /* This is mostly for debugging... so that we know what is still
1250 * gracefully dealing with existing request.
1253 for (i = 0; i < num_daemons; ++i) {
1254 if (ap_child_table[i].pid) {
1255 ap_child_table[i].status = SERVER_DYING;
1258 /* give the children the signal to die */
1259 for (i = 0; i < num_daemons;) {
1260 if ((rv = apr_write(pipe_of_death_out, &char_of_death, &one)) != APR_SUCCESS) {
1261 if (apr_canonical_error(rv) == APR_EINTR) continue;
1262 ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf,
1263 "write pipe_of_death");
1269 /* Kill 'em all. Since the child acts the same on the parents SIGTERM
1270 * and a SIGHUP, we may as well use the same signal, because some user
1271 * pthreads are stealing signals from us left and right.
1273 if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
1274 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf,
1277 ap_reclaim_child_processes(1); /* Start with SIGTERM */
1278 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0,
1279 ap_server_conf, "SIGHUP received. Attempting to restart");
1284 static void perchild_pre_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp)
1286 static int restart_num = 0;
1290 one_process = !!getenv("ONE_PROCESS");
1291 no_detach = !!getenv("NO_DETACH");
1293 /* sigh, want this only the second time around */
1294 if (restart_num++ == 1) {
1297 if (!one_process && !no_detach) {
1305 ap_listen_pre_config();
1306 num_daemons = DEFAULT_NUM_DAEMON;
1307 threads_to_start = DEFAULT_START_THREAD;
1308 min_spare_threads = DEFAULT_MIN_SPARE_THREAD;
1309 max_spare_threads = DEFAULT_MAX_SPARE_THREAD;
1310 max_threads = HARD_THREAD_LIMIT;
1311 ap_pid_fname = DEFAULT_PIDLOG;
1312 ap_scoreboard_fname = DEFAULT_SCOREBOARD;
1313 lock_fname = DEFAULT_LOCKFILE;
1314 max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
1315 ap_perchild_set_maintain_connection_status(1);
1319 apr_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
1321 for (i = 0; i < HARD_SERVER_LIMIT; i++) {
1322 child_info_table[i].uid = -1;
1323 child_info_table[i].gid = -1;
1324 child_info_table[i].readpipe = -1;
1326 for (i = 0; i < HARD_THREAD_LIMIT; i++) {
1327 thread_socket_table[i] = -1;
1331 static int pass_request(request_rec *r)
1333 /* Add 2 to the length. 1 for the socket, and one for a 0 byte. */
1334 int len = r->connection->client->inptr - r->connection->client->inbase + 2;
1335 char *foo = apr_palloc(r->pool, len);
1336 apr_socket_t *thesock = ap_iol_get_socket(r->connection->client->iol);
1339 perchild_server_conf *sconf = (perchild_server_conf *)
1340 ap_get_module_config(r->server->module_config,
1341 &mpm_perchild_module);
1344 if (ioctl(sconf->writepipe, I_SENDFD, realfds[0]) < 0);
1346 apr_get_os_sock(&sfd, thesock);
1349 apr_cpystrn(foo + 2, r->connection->client->inbase, len);
1351 if (write(realfds[1], foo, len) != len) {
1352 apr_destroy_pool(r->pool);
1356 if (ioctl(sconf->writepipe, I_SENDFD, sfd) < 0) {
1357 fprintf(stderr, "Could not send %d %d\n", errno, sconf->writepipe);
1359 apr_destroy_pool(r->pool);
1363 fprintf(stderr, "SUCCESS\n");
1365 apr_destroy_pool(r->pool);
1369 static int perchild_post_read(request_rec *r)
1371 int thread_num = r->connection->id % HARD_THREAD_LIMIT;
1372 perchild_server_conf *sconf = (perchild_server_conf *)
1373 ap_get_module_config(r->server->module_config,
1374 &mpm_perchild_module);
1376 fprintf(stderr, "Getting into perchild_post_read\n");
1379 if (thread_socket_table[thread_num] != -1) {
1383 fprintf(stderr, "This didn't come from the network layer. :-)\n");
1385 apr_put_os_sock(&csd, &thread_socket_table[thread_num],
1386 r->connection->client->pool);
1387 ap_sock_disable_nagle(thread_socket_table[thread_num]);
1388 iol = ap_iol_attach_socket(r->connection->client->pool, csd);
1389 ap_bpush_iol(r->connection->client, iol);
1393 if (sconf->readpipe != child_info_table[child_num].readpipe) {
1395 fprintf(stderr, "This isn't for me. :-) %d %d\n", sconf->readpipe, getpid());
1398 if (pass_request(r) == -1) {
1399 ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_NOERRNO, 0,
1400 ap_server_conf, "Could not pass request to proper "
1401 "child, request will not be honored.");
1403 fprintf(stderr, "trying to send to somebody else %d\n", child_num);
1405 longjmp(jmpbuffer, 1);
1412 static void perchild_hooks(void)
1417 ap_hook_pre_config(perchild_pre_config, NULL, NULL, AP_HOOK_MIDDLE);
1418 /* This must be run absolutely first. If this request isn't for this
1419 * server then we need to forward it to the proper child. No sense
1420 * tying up this server running more post_read request hooks if it is
1421 * just going to be forwarded along.
1423 ap_hook_post_read_request(perchild_post_read, NULL, NULL, AP_HOOK_REALLY_FIRST);
1426 static const char *set_pidfile(cmd_parms *cmd, void *dummy, const char *arg)
1428 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1433 if (cmd->server->is_virtual) {
1434 return "PidFile directive not allowed in <VirtualHost>";
1440 static const char *set_scoreboard(cmd_parms *cmd, void *dummy, const char *arg)
1442 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1447 ap_scoreboard_fname = arg;
1451 static const char *set_lockfile(cmd_parms *cmd, void *dummy, const char *arg)
1453 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1461 static const char *set_num_daemons (cmd_parms *cmd, void *dummy, const char *arg)
1463 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1468 num_daemons = atoi(arg);
1469 if (num_daemons > HARD_SERVER_LIMIT) {
1470 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1471 "WARNING: NumServers of %d exceeds compile time limit "
1472 "of %d servers,", num_daemons, HARD_SERVER_LIMIT);
1473 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1474 " lowering NumServers to %d. To increase, please "
1475 "see the", HARD_SERVER_LIMIT);
1476 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1477 " HARD_SERVER_LIMIT define in %s.",
1478 AP_MPM_HARD_LIMITS_FILE);
1479 num_daemons = HARD_SERVER_LIMIT;
1481 else if (num_daemons < 1) {
1482 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1483 "WARNING: Require NumServers > 0, setting to 1");
1489 static const char *set_threads_to_start (cmd_parms *cmd, void *dummy, const char *arg)
1491 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1496 threads_to_start = atoi(arg);
1497 if (threads_to_start > HARD_THREAD_LIMIT) {
1498 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1499 "WARNING: StartThreads of %d exceeds compile time"
1500 " limit of %d threads,", threads_to_start,
1502 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1503 " lowering StartThreads to %d. To increase, please"
1504 " see the", HARD_THREAD_LIMIT);
1505 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1506 " HARD_THREAD_LIMIT define in %s.",
1507 AP_MPM_HARD_LIMITS_FILE);
1509 else if (threads_to_start < 1) {
1510 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1511 "WARNING: Require StartThreads > 0, setting to 1");
1512 threads_to_start = 1;
1517 static const char *set_min_spare_threads(cmd_parms *cmd, void *dummy, const char *arg)
1519 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1524 min_spare_threads = atoi(arg);
1525 if (min_spare_threads <= 0) {
1526 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1527 "WARNING: detected MinSpareThreads set to non-positive.");
1528 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1529 "Resetting to 1 to avoid almost certain Apache failure.");
1530 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1531 "Please read the documentation.");
1532 min_spare_threads = 1;
1538 static const char *set_max_spare_threads(cmd_parms *cmd, void *dummy, const char *arg)
1540 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1545 max_spare_threads = atoi(arg);
1546 if (max_spare_threads >= HARD_THREAD_LIMIT) {
1547 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1548 "WARNING: detected MinSpareThreads set higher than");
1549 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1550 "HARD_THREAD_LIMIT. Resetting to %d", HARD_THREAD_LIMIT);
1551 max_spare_threads = HARD_THREAD_LIMIT;
1556 static const char *set_max_threads(cmd_parms *cmd, void *dummy, const char *arg)
1558 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1563 max_threads = atoi(arg);
1564 if (max_threads > HARD_THREAD_LIMIT) {
1565 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1566 "WARNING: detected MaxThreadsPerChild set higher than");
1567 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1568 "HARD_THREAD_LIMIT. Resetting to %d", HARD_THREAD_LIMIT);
1569 max_threads = HARD_THREAD_LIMIT;
1574 static const char *set_max_requests(cmd_parms *cmd, void *dummy, const char *arg)
1576 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1581 max_requests_per_child = atoi(arg);
1586 static const char *set_maintain_connection_status(cmd_parms *cmd,
1587 void *dummy, int arg)
1589 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1594 ap_perchild_set_maintain_connection_status(arg != 0);
1598 static const char *set_coredumpdir (cmd_parms *cmd, void *dummy, const char *arg)
1602 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1607 fname = ap_server_root_relative(cmd->pool, arg);
1608 if ((apr_stat(&finfo, fname, cmd->pool) != APR_SUCCESS) ||
1609 (finfo.filetype != APR_DIR)) {
1610 return apr_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
1611 " does not exist or is not a directory", NULL);
1613 apr_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir));
1617 static const char *set_child_per_uid(cmd_parms *cmd, void *dummy, const char *u,
1618 const char *g, const char *num)
1621 int max_this_time = atoi(num) + curr_child_num;
1622 for (i = curr_child_num; i < max_this_time; i++, curr_child_num++); {
1623 child_info_t *ug = &child_info_table[i - 1];
1625 if (i > num_daemons) {
1626 return "Trying to use more child ID's than NumServers. Increase "
1627 "NumServers in your config file.";
1637 static const char *assign_childuid(cmd_parms *cmd, void *dummy, const char *uid,
1644 perchild_server_conf *sconf = (perchild_server_conf *)
1645 ap_get_module_config(cmd->server->module_config,
1646 &mpm_perchild_module);
1648 if (pipe(fds) < 0) {
1649 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, cmd->server,
1650 "Could not create pipe to pass request through");
1652 sconf->readpipe = fds[0];
1653 sconf->writepipe = fds[1];
1655 for (i = 0; i < num_daemons; i++) {
1656 if (u == child_info_table[i].uid && g == child_info_table[i].gid) {
1657 child_info_table[i].readpipe = sconf->readpipe;
1665 static const command_rec perchild_cmds[] = {
1666 UNIX_DAEMON_COMMANDS
1668 AP_INIT_TAKE1("PidFile", set_pidfile, NULL, RSRC_CONF,
1669 "A file for logging the server process ID"),
1670 AP_INIT_TAKE1("ScoreBoardFile", set_scoreboard, NULL, RSRC_CONF,
1671 "A file for Apache to maintain runtime process management information"),
1672 AP_INIT_TAKE1("LockFile", set_lockfile, NULL, RSRC_CONF,
1673 "The lockfile used when Apache needs to lock the accept() call"),
1674 AP_INIT_TAKE1("NumServers", set_num_daemons, NULL, RSRC_CONF,
1675 "Number of children alive at the same time"),
1676 AP_INIT_TAKE1("StartThreads", set_threads_to_start, NULL, RSRC_CONF,
1677 "Number of threads each child creates"),
1678 AP_INIT_TAKE1("MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF,
1679 "Minimum number of idle threads per child, to handle request spikes"),
1680 AP_INIT_TAKE1("MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF,
1681 "Maximum number of idle threads per child"),
1682 AP_INIT_TAKE1("MaxThreadsPerChild", set_max_threads, NULL, RSRC_CONF,
1683 "Maximum number of threads per child"),
1684 AP_INIT_TAKE1("MaxRequestsPerChild", set_max_requests, NULL, RSRC_CONF,
1685 "Maximum number of requests a particular child serves before dying."),
1686 AP_INIT_FLAG("ConnectionStatus", set_maintain_connection_status, NULL, RSRC_CONF,
1687 "Whether or not to maintain status information on current connections"),
1688 AP_INIT_TAKE1("CoreDumpDirectory", set_coredumpdir, NULL, RSRC_CONF,
1689 "The location of the directory Apache changes to before dumping core"),
1690 AP_INIT_TAKE3("ChildperUserID", set_child_per_uid, NULL, RSRC_CONF,
1691 "Specify a User and Group for a specific child process."),
1692 AP_INIT_TAKE2("AssignUserID", assign_childuid, NULL, RSRC_CONF,
1693 "Tie a virtual host to a specific child process."),
1697 static void *perchild_create_config(apr_pool_t *p, server_rec *s)
1699 perchild_server_conf *c =
1700 (perchild_server_conf *) apr_pcalloc(p, sizeof(perchild_server_conf));
1708 module MODULE_VAR_EXPORT mpm_perchild_module = {
1710 NULL, /* hook to run before apache parses args */
1711 NULL, /* create per-directory config structure */
1712 NULL, /* merge per-directory config structures */
1713 perchild_create_config, /* create per-server config structure */
1714 NULL, /* merge per-server config structures */
1715 perchild_cmds, /* command apr_table_t */
1716 NULL, /* handlers */
1717 perchild_hooks /* register_hooks */