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>
102 * Actual definitions of config globals
105 static int threads_to_start = 0; /* Worker threads per child */
106 static int min_spare_threads = 0;
107 static int max_spare_threads = 0;
108 static int max_threads = 0;
109 static int max_requests_per_child = 0;
110 static const char *ap_pid_fname=NULL;
111 API_VAR_EXPORT const char *ap_scoreboard_fname=NULL;
112 static int num_daemons=0;
113 static int curr_child_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 {
127 const char *sockname; /* The base name for the socket */
128 const char *fullsockname; /* socket base name + extension */
129 int sd; /* The socket descriptor */
130 int sd2; /* The socket descriptor */
131 } perchild_server_conf;
133 typedef struct child_info_t child_info_t;
135 /* Tables used to determine the user and group each child process should
136 * run as. The hash table is used to correlate a server name with a child
139 static child_info_t child_info_table[HARD_SERVER_LIMIT];
140 static int thread_socket_table[HARD_THREAD_LIMIT];
143 struct ap_ctable ap_child_table[HARD_SERVER_LIMIT];
146 * The max child slot ever assigned, preserved across restarts. Necessary
147 * to deal with NumServers changes across SIGWINCH restarts. We use this
148 * value to optimize routines that have to scan the entire child table.
150 * XXX - It might not be worth keeping this code in. There aren't very
151 * many child processes in this MPM.
153 int ap_max_daemons_limit = -1;
155 char ap_coredump_dir[MAX_STRING_LEN];
157 module MODULE_VAR_EXPORT mpm_perchild_module;
159 static apr_file_t *pipe_of_death_in = NULL;
160 static apr_file_t *pipe_of_death_out = NULL;
161 static pthread_mutex_t pipe_of_death_mutex;
163 /* *Non*-shared http_main globals... */
165 server_rec *ap_server_conf;
167 /* one_process --- debugging mode variable; can be set from the command line
168 * with the -X flag. If set, this gets you the child_main loop running
169 * in the process which originally started up (no detach, no make_child),
170 * which is a pretty nice debugging environment. (You'll get a SIGHUP
171 * early in standalone_main; just continue through. This is the server
172 * trying to kill off any child processes which it might have lying
173 * around --- Apache doesn't keep track of their pids, it just sends
174 * SIGHUP to the process group, ignoring it in the root process.
175 * Continue through and you'll be fine.).
178 static int one_process = 0;
181 int raise_sigstop_flags;
184 static apr_pool_t *pconf; /* Pool for config stuff */
185 static apr_pool_t *pchild; /* Pool for httpd child stuff */
186 static apr_pool_t *thread_pool_parent; /* Parent of per-thread pools */
187 static pthread_mutex_t thread_pool_parent_mutex;
189 static int child_num;
190 static unsigned int my_pid; /* Linux getpid() doesn't work except in
191 main thread. Use this instead */
192 /* Keep track of the number of worker threads currently active */
193 static int worker_thread_count;
194 static pthread_mutex_t worker_thread_count_mutex;
195 static int worker_thread_free_ids[HARD_THREAD_LIMIT];
196 static pthread_attr_t worker_thread_attr;
198 /* Keep track of the number of idle worker threads */
199 static int idle_thread_count;
200 static pthread_mutex_t idle_thread_count_mutex;
202 /* Locks for accept serialization */
203 #ifdef NO_SERIALIZED_ACCEPT
204 #define SAFE_ACCEPT(stmt) APR_SUCCESS
206 #define SAFE_ACCEPT(stmt) (stmt)
207 static apr_lock_t *process_accept_mutex;
208 #endif /* NO_SERIALIZED_ACCEPT */
209 static const char *lock_fname;
210 static pthread_mutex_t thread_accept_mutex = PTHREAD_MUTEX_INITIALIZER;
212 API_EXPORT(int) ap_get_max_daemons(void)
214 return ap_max_daemons_limit;
217 /* a clean exit from a child with proper cleanup */
218 static void clean_child_exit(int code)
221 apr_destroy_pool(pchild);
226 /* handle all varieties of core dumping signals */
227 static void sig_coredump(int sig)
229 chdir(ap_coredump_dir);
230 apr_signal(sig, SIG_DFL);
232 /* At this point we've got sig blocked, because we're still inside
233 * the signal handler. When we leave the signal handler it will
234 * be unblocked, and we'll take the signal... and coredump or whatever
235 * is appropriate for this particular Unix. In addition the parent
236 * will see the real signal we received -- whereas if we called
237 * abort() here, the parent would only see SIGABRT.
241 static void just_die(int sig)
246 /*****************************************************************
247 * Connection structures and accounting...
250 /* volatile just in case */
251 static int volatile shutdown_pending;
252 static int volatile restart_pending;
253 static int volatile is_graceful;
256 * ap_start_shutdown() and ap_start_restart(), below, are a first stab at
257 * functions to initiate shutdown or restart without relying on signals.
258 * Previously this was initiated in sig_term() and restart() signal handlers,
259 * but we want to be able to start a shutdown/restart from other sources --
260 * e.g. on Win32, from the service manager. Now the service manager can
261 * call ap_start_shutdown() or ap_start_restart() as appropiate. Note that
262 * these functions can also be called by the child processes, since global
263 * variables are no longer used to pass on the required action to the parent.
265 * These should only be called from the parent process itself, since the
266 * parent process will use the shutdown_pending and restart_pending variables
267 * to determine whether to shutdown or restart. The child process should
268 * call signal_parent() directly to tell the parent to die -- this will
269 * cause neither of those variable to be set, which the parent will
270 * assume means something serious is wrong (which it will be, for the
271 * child to force an exit) and so do an exit anyway.
274 void ap_start_shutdown(void)
276 if (shutdown_pending == 1) {
277 /* Um, is this _probably_ not an error, if the user has
278 * tried to do a shutdown twice quickly, so we won't
279 * worry about reporting it.
283 shutdown_pending = 1;
286 /* do a graceful restart if graceful == 1 */
287 static void ap_start_restart(int graceful)
290 if (restart_pending == 1) {
291 /* Probably not an error - don't bother reporting it */
295 is_graceful = graceful;
297 apr_kill_cleanup(pconf, NULL, ap_cleanup_shared_mem);
301 static void sig_term(int sig)
306 static void restart(int sig)
309 ap_start_restart(sig == SIGWINCH);
315 static void set_signals(void)
317 #ifndef NO_USE_SIGACTION
320 sigemptyset(&sa.sa_mask);
324 sa.sa_handler = sig_coredump;
325 #if defined(SA_ONESHOT)
326 sa.sa_flags = SA_ONESHOT;
327 #elif defined(SA_RESETHAND)
328 sa.sa_flags = SA_RESETHAND;
330 if (sigaction(SIGSEGV, &sa, NULL) < 0)
331 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGSEGV)");
333 if (sigaction(SIGBUS, &sa, NULL) < 0)
334 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGBUS)");
337 if (sigaction(SIGABORT, &sa, NULL) < 0)
338 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABORT)");
341 if (sigaction(SIGABRT, &sa, NULL) < 0)
342 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABRT)");
345 if (sigaction(SIGILL, &sa, NULL) < 0)
346 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGILL)");
350 sa.sa_handler = sig_term;
351 if (sigaction(SIGTERM, &sa, NULL) < 0)
352 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGTERM)");
354 if (sigaction(SIGINT, &sa, NULL) < 0)
355 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGINT)");
358 sa.sa_handler = SIG_DFL;
359 if (sigaction(SIGXCPU, &sa, NULL) < 0)
360 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGXCPU)");
363 sa.sa_handler = SIG_DFL;
364 if (sigaction(SIGXFSZ, &sa, NULL) < 0)
365 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGXFSZ)");
368 sa.sa_handler = SIG_IGN;
369 if (sigaction(SIGPIPE, &sa, NULL) < 0)
370 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGPIPE)");
373 /* we want to ignore HUPs and WINCH while we're busy processing one */
374 sigaddset(&sa.sa_mask, SIGHUP);
375 sigaddset(&sa.sa_mask, SIGWINCH);
376 sa.sa_handler = restart;
377 if (sigaction(SIGHUP, &sa, NULL) < 0)
378 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGHUP)");
379 if (sigaction(SIGWINCH, &sa, NULL) < 0)
380 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGWINCH)");
383 apr_signal(SIGSEGV, sig_coredump);
385 apr_signal(SIGBUS, sig_coredump);
388 apr_signal(SIGABORT, sig_coredump);
389 #endif /* SIGABORT */
391 apr_signal(SIGABRT, sig_coredump);
394 apr_signal(SIGILL, sig_coredump);
397 apr_signal(SIGXCPU, SIG_DFL);
400 apr_signal(SIGXFSZ, SIG_DFL);
404 apr_signal(SIGTERM, sig_term);
406 apr_signal(SIGHUP, restart);
409 apr_signal(SIGWINCH, restart);
410 #endif /* SIGWINCH */
412 apr_signal(SIGPIPE, SIG_IGN);
418 /*****************************************************************
419 * Here follows a long bunch of generic server bookkeeping stuff...
422 int ap_graceful_stop_signalled(void)
424 /* XXX - Does this really work? - Manoj */
428 /*****************************************************************
429 * Child process main loop.
432 static void process_socket(apr_pool_t *p, apr_socket_t *sock, long conn_id)
435 conn_rec *current_conn;
439 int thread_num = conn_id % HARD_THREAD_LIMIT;
441 if ((rv = apr_get_os_sock(&csd, sock)) != APR_SUCCESS) {
442 ap_log_error(APLOG_MARK, APLOG_ERR, rv, NULL, "apr_get_os_sock");
445 if (csd >= FD_SETSIZE) {
446 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, NULL,
447 "new file descriptor %d is too large; you probably need "
448 "to rebuild Apache with a larger FD_SETSIZE "
451 apr_close_socket(sock);
455 if (thread_socket_table[thread_num] < 0) {
456 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 = apr_recv(listenfds[0], &pipe_read_char, &n);
524 if (apr_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 apr_socket_t *csd = NULL;
542 apr_pool_t *tpool; /* Pool for this thread */
543 apr_pool_t *ptrans; /* Pool for per-transaction stuff */
544 apr_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 apr_pollfd_t *pollset;
554 pthread_mutex_lock(&thread_pool_parent_mutex);
555 apr_create_pool(&tpool, thread_pool_parent);
556 pthread_mutex_unlock(&thread_pool_parent_mutex);
557 apr_create_pool(&ptrans, tpool);
559 apr_setup_poll(&pollset, num_listenfds+1, tpool);
560 for(n=0 ; n <= num_listenfds ; ++n) {
561 apr_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(apr_lock(process_accept_mutex)))
588 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
589 "apr_lock failed. Attempting to shutdown "
590 "process gracefully.");
591 workers_may_exit = 1;
594 while (!workers_may_exit) {
596 srv = apr_poll(pollset, &n, -1);
598 if (srv != APR_SUCCESS) {
599 if (apr_canonical_error(srv) == APR_EINTR) {
603 /* apr_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, "apr_poll: (listen)");
607 workers_may_exit = 1;
609 if (workers_may_exit) break;
611 apr_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 apr_get_revents(&event, listenfds[1], pollset);
620 if (event & APR_POLLIN || event & APR_POLLOUT) {
621 /* This request is from another child in our current process.
622 * We should set a flag here, and then below we will read
623 * two bytes (the socket number and the NULL byte.
625 thread_socket_table[thread_num] = -2;
626 goto got_from_other_child;
629 if (num_listenfds == 1) {
630 sd = ap_listeners->sd;
634 /* find a listener */
635 curr_pollfd = last_pollfd;
638 if (curr_pollfd > num_listenfds) {
641 /* XXX: Should we check for POLLERR? */
642 apr_get_revents(&event, listenfds[curr_pollfd], pollset);
643 if (event & APR_POLLIN) {
644 last_pollfd = curr_pollfd;
645 sd = listenfds[curr_pollfd];
648 } while (curr_pollfd != last_pollfd);
652 if (!workers_may_exit) {
653 if ((rv = apr_accept(&csd, sd, ptrans)) != APR_SUCCESS) {
654 ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, "apr_accept");
656 if ((rv = SAFE_ACCEPT(apr_unlock(process_accept_mutex)))
658 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
659 "apr_unlock failed. Attempting to shutdown "
660 "process gracefully.");
661 workers_may_exit = 1;
663 pthread_mutex_unlock(&thread_accept_mutex);
664 pthread_mutex_lock(&idle_thread_count_mutex);
665 if (idle_thread_count > min_spare_threads) {
669 if (!start_thread()) {
673 pthread_mutex_unlock(&idle_thread_count_mutex);
674 got_from_other_child:
675 if (thread_socket_table[thread_num] == -2) {
677 struct cmsghdr *cmsg;
682 iov.iov_base = sockname;
690 cmsg = apr_palloc(ptrans, sizeof(*cmsg) + sizeof(sd));
691 cmsg->cmsg_len = sizeof(*cmsg) + sizeof(sd);
692 msg.msg_control = cmsg;
693 msg.msg_controllen = cmsg->cmsg_len;
696 ret = recvmsg(child_info_table[child_num].sd, &msg, 0);
698 memcpy(&dp, CMSG_DATA(cmsg), sizeof(dp));
700 thread_socket_table[thread_num] = dp;
701 apr_put_os_sock(&csd, &child_info_table[child_num].sd, ptrans);
703 if (setjmp(jmpbuffer) != 1) {
704 process_socket(ptrans, csd, conn_id);
707 thread_socket_table[thread_num] = -1;
709 requests_this_child--;
711 if ((rv = SAFE_ACCEPT(apr_unlock(process_accept_mutex)))
713 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
714 "apr_unlock failed. Attempting to shutdown "
715 "process gracefully.");
716 workers_may_exit = 1;
718 pthread_mutex_unlock(&thread_accept_mutex);
719 pthread_mutex_lock(&idle_thread_count_mutex);
721 pthread_mutex_unlock(&idle_thread_count_mutex);
724 apr_clear_pool(ptrans);
727 pthread_mutex_lock(&thread_pool_parent_mutex);
728 apr_destroy_pool(tpool);
729 pthread_mutex_unlock(&thread_pool_parent_mutex);
730 pthread_mutex_lock(&worker_thread_count_mutex);
731 worker_thread_count--;
732 worker_thread_free_ids[worker_thread_count] = thread_num;
733 if (worker_thread_count == 0) {
734 /* All the threads have exited, now finish the shutdown process
735 * by signalling the sigwait thread */
736 kill(my_pid, SIGTERM);
738 pthread_mutex_unlock(&worker_thread_count_mutex);
743 /* Set group privileges.
745 * Note that we use the username as set in the config files, rather than
746 * the lookup of to uid --- the same uid may have multiple passwd entries,
747 * with different sets of groups for each.
750 static int set_group_privs(uid_t uid, gid_t gid)
755 /* Get username if passed as a uid */
759 if ((ent = getpwuid(uid)) == NULL) {
760 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
761 "getpwuid: couldn't determine user name from uid %u, "
762 "you probably need to modify the User directive",
770 * Set the GID before initgroups(), since on some platforms
771 * setgid() is known to zap the group list.
773 if (setgid(gid) == -1) {
774 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
775 "setgid: unable to set group id to Group %u",
780 /* Reset `groups' attributes. */
782 if (initgroups(name, gid) == -1) {
783 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
784 "initgroups: unable to set groups for User %s "
785 "and Group %u", name, (unsigned)gid);
793 static int perchild_setup_child(int childnum)
795 child_info_t *ug = &child_info_table[childnum];
797 if (ug->uid == -1 && ug->gid == -1) {
798 return unixd_setup_child();
800 if (set_group_privs(ug->uid, ug->gid)) {
803 /* Only try to switch if we're running as root */
806 os_init_job_environment(server_conf, unixd_config.user_name, one_process) != 0 ||
808 setuid(ug->uid) == -1)) {
809 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
810 "setuid: unable to change to uid: %ld",
817 static void child_main(int child_num_arg)
826 child_num = child_num_arg;
827 apr_create_pool(&pchild, pconf);
829 /*stuff to do before we switch id's, so we have permissions.*/
831 rv = SAFE_ACCEPT(apr_child_init_lock(&process_accept_mutex, lock_fname,
833 if (rv != APR_SUCCESS) {
834 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
835 "Couldn't initialize cross-process lock in child");
836 clean_child_exit(APEXIT_CHILDFATAL);
839 if (perchild_setup_child(child_num)) {
840 clean_child_exit(APEXIT_CHILDFATAL);
843 ap_child_init_hook(pchild, ap_server_conf);
845 /*done with init critical section */
847 /* All threads should mask signals out, accoring to sigwait(2) man page */
848 sigfillset(&sig_mask);
850 #ifdef SIGPROCMASK_SETS_THREAD_MASK
851 if (sigprocmask(SIG_SETMASK, &sig_mask, NULL) != 0) {
852 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf, "sigprocmask");
855 if ((rv = pthread_sigmask(SIG_SETMASK, &sig_mask, NULL)) != 0) {
856 #ifdef PTHREAD_SETS_ERRNO
859 ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
864 requests_this_child = max_requests_per_child;
866 /* Set up the pollfd array, num_listenfds + 1 for the pipe and 1 for
869 listenfds = apr_pcalloc(pchild, sizeof(*listenfds) * (num_listenfds + 2));
870 #if APR_FILES_AS_SOCKETS
871 apr_socket_from_file(&listenfds[0], pipe_of_death_in);
874 /* The child socket */
875 apr_put_os_sock(&listenfds[1], &child_info_table[child_num].sd, pchild);
878 for (lr = ap_listeners, i = 2; i <= num_listenfds; lr = lr->next, ++i)
881 /* Setup worker threads */
883 if (threads_to_start > max_threads) {
884 threads_to_start = max_threads;
886 idle_thread_count = threads_to_start;
887 worker_thread_count = 0;
888 for (i = 0; i < max_threads; i++) {
889 worker_thread_free_ids[i] = i;
891 apr_create_pool(&thread_pool_parent, pchild);
892 pthread_mutex_init(&thread_pool_parent_mutex, NULL);
893 pthread_mutex_init(&idle_thread_count_mutex, NULL);
894 pthread_mutex_init(&worker_thread_count_mutex, NULL);
895 pthread_mutex_init(&pipe_of_death_mutex, NULL);
896 pthread_attr_init(&worker_thread_attr);
897 #ifdef PTHREAD_ATTR_SETDETACHSTATE_ARG2_ADDR
901 pthread_attr_setdetachstate(&worker_thread_attr, &on);
904 pthread_attr_setdetachstate(&worker_thread_attr, PTHREAD_CREATE_DETACHED);
907 /* We are creating worker threads right now */
908 for (i=0; i < threads_to_start; i++) {
909 /* start_thread shouldn't fail here */
910 if (!start_thread()) {
915 /* This thread will be the one responsible for handling signals */
916 sigemptyset(&sig_mask);
917 sigaddset(&sig_mask, SIGTERM);
918 sigaddset(&sig_mask, SIGINT);
919 ap_sigwait(&sig_mask, &signal_received);
920 switch (signal_received) {
923 just_die(signal_received);
926 ap_log_error(APLOG_MARK, APLOG_ALERT, errno, ap_server_conf,
927 "received impossible signal: %d", signal_received);
932 static int make_child(server_rec *s, int slot, time_t now)
936 if (slot + 1 > ap_max_daemons_limit) {
937 ap_max_daemons_limit = slot + 1;
942 ap_child_table[slot].pid = getpid();
943 ap_child_table[slot].status = SERVER_ALIVE;
947 if ((pid = fork()) == -1) {
948 ap_log_error(APLOG_MARK, APLOG_ERR, errno, s,
949 "fork: Unable to fork new process");
950 /* In case system resources are maxxed out, we don't want
951 Apache running away with the CPU trying to fork over and
952 over and over again. */
959 #ifdef AIX_BIND_PROCESSOR
960 /* By default, AIX binds to a single processor. This bit unbinds
961 children which will then bind to another CPU.
963 #include <sys/processor.h>
964 int status = bindprocessor(BINDPROCESS, (int)getpid(),
965 PROCESSOR_CLASS_ANY);
967 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, errno,
968 ap_server_conf, "processor unbind failed %d", status);
971 RAISE_SIGSTOP(MAKE_CHILD);
973 /* XXX - For an unthreaded server, a signal handler will be necessary
974 apr_signal(SIGTERM, just_die);
981 ap_child_table[slot].pid = pid;
982 ap_child_table[slot].status = SERVER_ALIVE;
987 /* start up a bunch of children */
988 static int startup_children(int number_to_start)
992 for (i = 0; number_to_start && i < num_daemons; ++i) {
993 if (ap_child_table[i].pid) {
996 if (make_child(ap_server_conf, i, 0) < 0) {
1001 return number_to_start;
1006 * spawn_rate is the number of children that will be spawned on the
1007 * next maintenance cycle if there aren't enough servers. It is
1008 * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
1009 * without the need to spawn.
1011 static int spawn_rate = 1;
1012 #ifndef MAX_SPAWN_RATE
1013 #define MAX_SPAWN_RATE (32)
1015 static int hold_off_on_exponential_spawning;
1017 static void perform_child_maintenance(void)
1022 int free_slots[MAX_SPAWN_RATE];
1023 int last_non_dead = -1;
1025 /* initialize the free_list */
1028 for (i = 0; i < num_daemons; ++i) {
1029 if (ap_child_table[i].pid == 0) {
1030 if (free_length < spawn_rate) {
1031 free_slots[free_length] = i;
1039 if (i >= ap_max_daemons_limit && free_length >= spawn_rate) {
1043 ap_max_daemons_limit = last_non_dead + 1;
1045 if (free_length > 0) {
1046 for (i = 0; i < free_length; ++i) {
1047 make_child(ap_server_conf, free_slots[i], now);
1049 /* the next time around we want to spawn twice as many if this
1050 * wasn't good enough, but not if we've just done a graceful
1052 if (hold_off_on_exponential_spawning) {
1053 --hold_off_on_exponential_spawning;
1055 else if (spawn_rate < MAX_SPAWN_RATE) {
1064 static void server_main_loop(int remaining_children_to_start)
1071 while (!restart_pending && !shutdown_pending) {
1072 ap_wait_or_timeout(&status, &pid, pconf);
1074 if (pid.pid != -1) {
1075 ap_process_child_status(&pid, status);
1076 /* non-fatal death... note that it's gone in the child table and
1077 * clean out the status table. */
1079 for (i = 0; i < ap_max_daemons_limit; ++i) {
1080 if (ap_child_table[i].pid == pid.pid) {
1084 for (j = 0; j < HARD_THREAD_LIMIT; j++) {
1085 ap_perchild_force_reset_connection_status(i * HARD_THREAD_LIMIT + j);
1090 if (child_slot >= 0) {
1091 ap_child_table[child_slot].pid = 0;
1093 if (remaining_children_to_start
1094 && child_slot < num_daemons) {
1095 /* we're still doing a 1-for-1 replacement of dead
1096 * children with new children
1098 make_child(ap_server_conf, child_slot, time(NULL));
1099 --remaining_children_to_start;
1101 #if APR_HAS_OTHER_CHILD
1103 else if (apr_reap_other_child(&pid, status) == 0) {
1107 else if (is_graceful) {
1108 /* Great, we've probably just lost a slot in the
1109 * child table. Somehow we don't know about this
1112 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0,
1114 "long lost child came home! (pid %ld)",
1117 /* Don't perform idle maintenance when a child dies,
1118 * only do it when there's a timeout. Remember only a
1119 * finite number of children can die, and it's pretty
1120 * pathological for a lot to die suddenly.
1124 else if (remaining_children_to_start) {
1125 /* we hit a 1 second timeout in which none of the previous
1126 * generation of children needed to be reaped... so assume
1127 * they're all done, and pick up the slack if any is left.
1129 remaining_children_to_start = \
1130 startup_children(remaining_children_to_start);
1131 /* In any event we really shouldn't do the code below because
1132 * few of the servers we just started are in the IDLE state
1133 * yet, so we'd mistakenly create an extra server.
1138 perform_child_maintenance();
1142 int ap_mpm_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s)
1144 int remaining_children_to_start;
1147 apr_ssize_t one = 1;
1151 if ((rv = apr_create_pipe(&pipe_of_death_in, &pipe_of_death_out, pconf))
1153 ap_log_error(APLOG_MARK, APLOG_ERR, rv,
1154 (const server_rec*) ap_server_conf,
1155 "apr_create_pipe (pipe_of_death)");
1158 if ((rv = apr_set_pipe_timeout(pipe_of_death_in, 0)) != APR_SUCCESS) {
1159 ap_log_error(APLOG_MARK, APLOG_ERR, rv,
1160 (const server_rec*) ap_server_conf,
1161 "apr_set_pipe_timeout (pipe_of_death)");
1165 if ((num_listenfds = ap_setup_listeners(ap_server_conf)) < 1) {
1166 /* XXX: hey, what's the right way for the mpm to indicate a fatal error? */
1167 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, 0, s,
1168 "no listening sockets available, shutting down");
1171 ap_log_pid(pconf, ap_pid_fname);
1173 /* Initialize cross-process accept lock */
1174 lock_fname = apr_psprintf(_pconf, "%s.%u",
1175 ap_server_root_relative(_pconf, lock_fname),
1177 rv = SAFE_ACCEPT(apr_create_lock(&process_accept_mutex, APR_MUTEX,
1178 APR_CROSS_PROCESS, lock_fname, _pconf));
1179 if (rv != APR_SUCCESS) {
1180 ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
1181 "Couldn't create cross-process lock");
1186 reinit_scoreboard(pconf);
1188 /* Initialize the child table */
1190 for (i = 0; i < HARD_SERVER_LIMIT; i++) {
1191 ap_child_table[i].pid = 0;
1197 /* If we're doing a graceful_restart then we're going to see a lot
1198 * of children exiting immediately when we get into the main loop
1199 * below (because we just sent them SIGWINCH). This happens pretty
1200 * rapidly... and for each one that exits we'll start a new one until
1201 * we reach at least daemons_min_free. But we may be permitted to
1202 * start more than that, so we'll just keep track of how many we're
1203 * supposed to start up without the 1 second penalty between each fork.
1205 remaining_children_to_start = num_daemons;
1207 remaining_children_to_start = \
1208 startup_children(remaining_children_to_start);
1211 /* give the system some time to recover before kicking into
1212 * exponential mode */
1213 hold_off_on_exponential_spawning = 10;
1216 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
1217 "%s configured -- resuming normal operations",
1218 ap_get_server_version());
1219 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, ap_server_conf,
1220 "Server built: %s", ap_get_server_built());
1221 restart_pending = shutdown_pending = 0;
1223 server_main_loop(remaining_children_to_start);
1225 if (shutdown_pending) {
1226 /* Time to gracefully shut down:
1227 * Kill child processes, tell them to call child_exit, etc...
1229 if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
1230 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf,
1233 ap_reclaim_child_processes(1); /* Start with SIGTERM */
1235 /* cleanup pid file on normal shutdown */
1237 const char *pidfile = NULL;
1238 pidfile = ap_server_root_relative (pconf, ap_pid_fname);
1239 if ( pidfile != NULL && unlink(pidfile) == 0)
1240 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0,
1242 "removed PID file %s (pid=%ld)",
1243 pidfile, (long)getpid());
1246 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0,
1247 ap_server_conf, "caught SIGTERM, shutting down");
1252 /* we've been told to restart */
1253 apr_signal(SIGHUP, SIG_IGN);
1256 /* not worth thinking about */
1261 char char_of_death = '!';
1263 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
1264 "SIGWINCH received. Doing graceful restart");
1266 /* This is mostly for debugging... so that we know what is still
1267 * gracefully dealing with existing request.
1270 for (i = 0; i < num_daemons; ++i) {
1271 if (ap_child_table[i].pid) {
1272 ap_child_table[i].status = SERVER_DYING;
1275 /* give the children the signal to die */
1276 for (i = 0; i < num_daemons;) {
1277 if ((rv = apr_write(pipe_of_death_out, &char_of_death, &one)) != APR_SUCCESS) {
1278 if (apr_canonical_error(rv) == APR_EINTR) continue;
1279 ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf,
1280 "write pipe_of_death");
1286 /* Kill 'em all. Since the child acts the same on the parents SIGTERM
1287 * and a SIGHUP, we may as well use the same signal, because some user
1288 * pthreads are stealing signals from us left and right.
1290 if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
1291 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf,
1294 ap_reclaim_child_processes(1); /* Start with SIGTERM */
1295 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0,
1296 ap_server_conf, "SIGHUP received. Attempting to restart");
1301 static void perchild_pre_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp)
1303 static int restart_num = 0;
1307 one_process = !!getenv("ONE_PROCESS");
1308 no_detach = !!getenv("NO_DETACH");
1310 /* sigh, want this only the second time around */
1311 if (restart_num++ == 1) {
1314 if (!one_process && !no_detach) {
1322 ap_listen_pre_config();
1323 num_daemons = DEFAULT_NUM_DAEMON;
1324 threads_to_start = DEFAULT_START_THREAD;
1325 min_spare_threads = DEFAULT_MIN_SPARE_THREAD;
1326 max_spare_threads = DEFAULT_MAX_SPARE_THREAD;
1327 max_threads = HARD_THREAD_LIMIT;
1328 ap_pid_fname = DEFAULT_PIDLOG;
1329 ap_scoreboard_fname = DEFAULT_SCOREBOARD;
1330 lock_fname = DEFAULT_LOCKFILE;
1331 max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
1332 ap_perchild_set_maintain_connection_status(1);
1335 apr_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
1337 for (i = 0; i < HARD_SERVER_LIMIT; i++) {
1338 child_info_table[i].uid = -1;
1339 child_info_table[i].gid = -1;
1340 child_info_table[i].sd = -1;
1342 for (i = 0; i < HARD_THREAD_LIMIT; i++) {
1343 thread_socket_table[i] = -1;
1347 static int pass_request(request_rec *r)
1349 apr_socket_t *thesock = ap_iol_get_socket(r->connection->client->iol);
1351 struct cmsghdr *cmsg;
1354 char *foo = r->connection->client->inbase;
1355 int len = r->connection->client->inptr - r->connection->client->inbase;
1356 perchild_server_conf *sconf = (perchild_server_conf *)
1357 ap_get_module_config(r->server->module_config,
1358 &mpm_perchild_module);
1360 apr_get_os_sock(&sfd, thesock);
1362 iov.iov_base = (char *)sconf->fullsockname;
1363 iov.iov_len = strlen(sconf->fullsockname) + 1;
1365 msg.msg_name = NULL;
1366 msg.msg_namelen = 0;
1370 cmsg = apr_palloc(r->pool, sizeof(*cmsg) + sizeof(sfd));
1371 cmsg->cmsg_len = sizeof(*cmsg) + sizeof(int);
1372 cmsg->cmsg_level = SOL_SOCKET;
1373 cmsg->cmsg_type = SCM_RIGHTS;
1375 memcpy(CMSG_DATA(cmsg), &sfd, sizeof(sfd));
1377 msg.msg_control = cmsg;
1378 msg.msg_controllen = cmsg->cmsg_len;
1381 if (sendmsg(sconf->sd2, &msg, 0) == -1) {
1382 apr_destroy_pool(r->pool);
1386 write(sconf->sd2, foo, len);
1388 apr_destroy_pool(r->pool);
1392 static char *make_perchild_socket(const char *fullsockname, int sd[2])
1394 socketpair(PF_UNIX, SOCK_STREAM, 0, sd);
1399 static void perchild_post_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s)
1403 perchild_server_conf *sconf;
1409 for (sr = s; sr; sr = sr->next) {
1410 sconf = (perchild_server_conf *)ap_get_module_config(sr->module_config,
1411 &mpm_perchild_module);
1413 if (sconf->sd == -1) {
1414 sconf->fullsockname = apr_pstrcat(sr->process->pool,
1415 sconf->sockname, ".DEFAULT", NULL);
1416 if (def_sd[0] == -1) {
1417 if (!make_perchild_socket(sconf->fullsockname, def_sd)) {
1421 sconf->sd = def_sd[0];
1422 sconf->sd2 = def_sd[1];
1426 for (i = 0; i < num_daemons; i++) {
1427 if (child_info_table[i].uid == -1) {
1428 child_info_table[i].sd = def_sd[0];
1433 static int perchild_post_read(request_rec *r)
1435 int thread_num = r->connection->id % HARD_THREAD_LIMIT;
1436 perchild_server_conf *sconf = (perchild_server_conf *)
1437 ap_get_module_config(r->server->module_config,
1438 &mpm_perchild_module);
1440 if (thread_socket_table[thread_num] != -1) {
1441 apr_socket_t *csd = NULL;
1444 apr_put_os_sock(&csd, &thread_socket_table[thread_num],
1445 r->connection->client->pool);
1446 ap_sock_disable_nagle(thread_socket_table[thread_num]);
1447 iol = ap_iol_attach_socket(r->connection->client->pool, csd);
1448 ap_bpush_iol(r->connection->client, iol);
1452 if (sconf->sd != child_info_table[child_num].sd) {
1453 if (pass_request(r) == -1) {
1454 ap_log_error(APLOG_MARK, APLOG_ERR | APLOG_NOERRNO, 0,
1455 ap_server_conf, "Could not pass request to proper "
1456 "child, request will not be honored.");
1458 longjmp(jmpbuffer, 1);
1465 static void perchild_hooks(void)
1470 ap_hook_pre_config(perchild_pre_config, NULL, NULL, AP_HOOK_MIDDLE);
1471 ap_hook_post_config(perchild_post_config, NULL, NULL, AP_HOOK_MIDDLE);
1472 /* This must be run absolutely first. If this request isn't for this
1473 * server then we need to forward it to the proper child. No sense
1474 * tying up this server running more post_read request hooks if it is
1475 * just going to be forwarded along.
1477 ap_hook_post_read_request(perchild_post_read, NULL, NULL, AP_HOOK_REALLY_FIRST);
1480 static const char *set_pidfile(cmd_parms *cmd, void *dummy, const char *arg)
1482 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1487 if (cmd->server->is_virtual) {
1488 return "PidFile directive not allowed in <VirtualHost>";
1494 static const char *set_scoreboard(cmd_parms *cmd, void *dummy, const char *arg)
1496 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1501 ap_scoreboard_fname = arg;
1505 static const char *set_lockfile(cmd_parms *cmd, void *dummy, const char *arg)
1507 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1515 static const char *set_num_daemons (cmd_parms *cmd, void *dummy, const char *arg)
1517 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1522 num_daemons = atoi(arg);
1523 if (num_daemons > HARD_SERVER_LIMIT) {
1524 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1525 "WARNING: NumServers of %d exceeds compile time limit "
1526 "of %d servers,", num_daemons, HARD_SERVER_LIMIT);
1527 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1528 " lowering NumServers to %d. To increase, please "
1529 "see the", HARD_SERVER_LIMIT);
1530 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1531 " HARD_SERVER_LIMIT define in %s.",
1532 AP_MPM_HARD_LIMITS_FILE);
1533 num_daemons = HARD_SERVER_LIMIT;
1535 else if (num_daemons < 1) {
1536 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1537 "WARNING: Require NumServers > 0, setting to 1");
1543 static const char *set_threads_to_start (cmd_parms *cmd, void *dummy, const char *arg)
1545 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1550 threads_to_start = atoi(arg);
1551 if (threads_to_start > HARD_THREAD_LIMIT) {
1552 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1553 "WARNING: StartThreads of %d exceeds compile time"
1554 " limit of %d threads,", threads_to_start,
1556 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1557 " lowering StartThreads to %d. To increase, please"
1558 " see the", HARD_THREAD_LIMIT);
1559 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1560 " HARD_THREAD_LIMIT define in %s.",
1561 AP_MPM_HARD_LIMITS_FILE);
1563 else if (threads_to_start < 1) {
1564 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1565 "WARNING: Require StartThreads > 0, setting to 1");
1566 threads_to_start = 1;
1571 static const char *set_min_spare_threads(cmd_parms *cmd, void *dummy, const char *arg)
1573 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1578 min_spare_threads = atoi(arg);
1579 if (min_spare_threads <= 0) {
1580 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1581 "WARNING: detected MinSpareThreads set to non-positive.");
1582 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1583 "Resetting to 1 to avoid almost certain Apache failure.");
1584 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1585 "Please read the documentation.");
1586 min_spare_threads = 1;
1592 static const char *set_max_spare_threads(cmd_parms *cmd, void *dummy, const char *arg)
1594 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1599 max_spare_threads = atoi(arg);
1600 if (max_spare_threads >= HARD_THREAD_LIMIT) {
1601 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1602 "WARNING: detected MinSpareThreads set higher than");
1603 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1604 "HARD_THREAD_LIMIT. Resetting to %d", HARD_THREAD_LIMIT);
1605 max_spare_threads = HARD_THREAD_LIMIT;
1610 static const char *set_max_threads(cmd_parms *cmd, void *dummy, const char *arg)
1612 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1617 max_threads = atoi(arg);
1618 if (max_threads > HARD_THREAD_LIMIT) {
1619 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1620 "WARNING: detected MaxThreadsPerChild set higher than");
1621 ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
1622 "HARD_THREAD_LIMIT. Resetting to %d", HARD_THREAD_LIMIT);
1623 max_threads = HARD_THREAD_LIMIT;
1628 static const char *set_max_requests(cmd_parms *cmd, void *dummy, const char *arg)
1630 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1635 max_requests_per_child = atoi(arg);
1640 static const char *set_maintain_connection_status(cmd_parms *cmd,
1641 void *dummy, int arg)
1643 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1648 ap_perchild_set_maintain_connection_status(arg != 0);
1652 static const char *set_coredumpdir (cmd_parms *cmd, void *dummy, const char *arg)
1656 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
1661 fname = ap_server_root_relative(cmd->pool, arg);
1662 if ((apr_stat(&finfo, fname, cmd->pool) != APR_SUCCESS) ||
1663 (finfo.filetype != APR_DIR)) {
1664 return apr_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
1665 " does not exist or is not a directory", NULL);
1667 apr_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir));
1671 static const char *set_child_per_uid(cmd_parms *cmd, void *dummy, const char *u,
1672 const char *g, const char *num)
1675 int max_this_time = atoi(num) + curr_child_num;
1676 for (i = curr_child_num; i < max_this_time; i++, curr_child_num++); {
1677 child_info_t *ug = &child_info_table[i - 1];
1679 if (i > num_daemons) {
1680 return "Trying to use more child ID's than NumServers. Increase "
1681 "NumServers in your config file.";
1690 static const char *assign_childuid(cmd_parms *cmd, void *dummy, const char *uid,
1698 perchild_server_conf *sconf = (perchild_server_conf *)
1699 ap_get_module_config(cmd->server->module_config,
1700 &mpm_perchild_module);
1702 sconf->fullsockname = apr_pstrcat(cmd->pool, sconf->sockname, ".", uid, ":", gid, NULL);
1704 if ((errstr = make_perchild_socket(sconf->fullsockname, socks))) {
1708 sconf->sd = socks[0];
1709 sconf->sd2 = socks[1];
1711 for (i = 0; i < num_daemons; i++) {
1712 if (u == child_info_table[i].uid && g == child_info_table[i].gid) {
1713 child_info_table[i].sd = sconf->sd;
1721 static const command_rec perchild_cmds[] = {
1722 UNIX_DAEMON_COMMANDS
1724 AP_INIT_TAKE1("PidFile", set_pidfile, NULL, RSRC_CONF,
1725 "A file for logging the server process ID"),
1726 AP_INIT_TAKE1("ScoreBoardFile", set_scoreboard, NULL, RSRC_CONF,
1727 "A file for Apache to maintain runtime process management information"),
1728 AP_INIT_TAKE1("LockFile", set_lockfile, NULL, RSRC_CONF,
1729 "The lockfile used when Apache needs to lock the accept() call"),
1730 AP_INIT_TAKE1("NumServers", set_num_daemons, NULL, RSRC_CONF,
1731 "Number of children alive at the same time"),
1732 AP_INIT_TAKE1("StartThreads", set_threads_to_start, NULL, RSRC_CONF,
1733 "Number of threads each child creates"),
1734 AP_INIT_TAKE1("MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF,
1735 "Minimum number of idle threads per child, to handle request spikes"),
1736 AP_INIT_TAKE1("MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF,
1737 "Maximum number of idle threads per child"),
1738 AP_INIT_TAKE1("MaxThreadsPerChild", set_max_threads, NULL, RSRC_CONF,
1739 "Maximum number of threads per child"),
1740 AP_INIT_TAKE1("MaxRequestsPerChild", set_max_requests, NULL, RSRC_CONF,
1741 "Maximum number of requests a particular child serves before dying."),
1742 AP_INIT_FLAG("ConnectionStatus", set_maintain_connection_status, NULL, RSRC_CONF,
1743 "Whether or not to maintain status information on current connections"),
1744 AP_INIT_TAKE1("CoreDumpDirectory", set_coredumpdir, NULL, RSRC_CONF,
1745 "The location of the directory Apache changes to before dumping core"),
1746 AP_INIT_TAKE3("ChildperUserID", set_child_per_uid, NULL, RSRC_CONF,
1747 "Specify a User and Group for a specific child process."),
1748 AP_INIT_TAKE2("AssignUserID", assign_childuid, NULL, RSRC_CONF,
1749 "Tie a virtual host to a specific child process."),
1753 static void *perchild_create_config(apr_pool_t *p, server_rec *s)
1755 perchild_server_conf *c =
1756 (perchild_server_conf *) apr_pcalloc(p, sizeof(perchild_server_conf));
1762 module MODULE_VAR_EXPORT mpm_perchild_module = {
1764 NULL, /* hook to run before apache parses args */
1765 NULL, /* create per-directory config structure */
1766 NULL, /* merge per-directory config structures */
1767 perchild_create_config, /* create per-server config structure */
1768 NULL, /* merge per-server config structures */
1769 perchild_cmds, /* command apr_table_t */
1770 NULL, /* handlers */
1771 perchild_hooks /* register_hooks */