1 /* ====================================================================
2 * Copyright (c) 1995-1999 The Apache Group. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in
13 * the documentation and/or other materials provided with the
16 * 3. All advertising materials mentioning features or use of this
17 * software must display the following acknowledgment:
18 * "This product includes software developed by the Apache Group
19 * for use in the Apache HTTP server project (http://www.apache.org/)."
21 * 4. The names "Apache Server" and "Apache Group" must not be used to
22 * endorse or promote products derived from this software without
23 * prior written permission. For written permission, please contact
26 * 5. Products derived from this software may not be called "Apache"
27 * nor may "Apache" appear in their names without prior written
28 * permission of the Apache Group.
30 * 6. Redistributions of any form whatsoever must retain the following
32 * "This product includes software developed by the Apache Group
33 * for use in the Apache HTTP server project (http://www.apache.org/)."
35 * THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
36 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
38 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE APACHE GROUP OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
41 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
42 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
44 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
45 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
46 * OF THE POSSIBILITY OF SUCH DAMAGE.
47 * ====================================================================
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Group and was originally based
51 * on public domain software written at the National Center for
52 * Supercomputing Applications, University of Illinois, Urbana-Champaign.
53 * For more information on the Apache Group and the Apache HTTP server
54 * project, please see <http://www.apache.org/>.
59 * httpd.c: simple http daemon for answering WWW file requests
62 * 03-21-93 Rob McCool wrote original code (up to NCSA HTTPd 1.3)
65 * changed server number for child-alone processes to 0 and changed name
69 * Added numerous speed hacks proposed by Robert S. Thau (rst@ai.mit.edu)
70 * including set group before fork, and call gettime before to fork
71 * to set up libraries.
74 * Brandon's code snarfed from NCSA 1.4, but tinkered to work with the
75 * Apache server, and also to have child processes do accept() directly.
78 * Extensive rework for Apache.
81 /* TODO: this is a cobbled together prefork MPM example... it should mostly
82 * TODO: behave like apache-1.3... here's a short list of things I think
83 * TODO: need cleaning up still:
84 * TODO: - use ralf's mm stuff for the shared mem and mutexes
85 * TODO: - clean up scoreboard stuff when we figure out how to do it in 2.0
90 #include "apr_portable.h"
92 #include "mpm_default.h"
93 #include "http_main.h"
95 #include "http_config.h"
96 #include "http_core.h" /* for get_remote_host */
97 #include "http_connection.h"
98 #include "scoreboard.h"
101 #include "iol_socket.h"
102 #include "ap_listen.h"
103 #ifdef USE_SHMGET_SCOREBOARD
104 #include <sys/types.h>
109 #ifdef HAVE_BSTRING_H
110 #include <bstring.h> /* for IRIX, FD_SET calls bzero() */
115 static int ap_max_requests_per_child=0;
116 static char *ap_pid_fname=NULL;
117 static char *ap_scoreboard_fname=NULL;
118 static char *ap_lock_fname;
119 static char *ap_server_argv0=NULL;
120 static int ap_daemons_to_start=0;
121 static int ap_daemons_min_free=0;
122 static int ap_daemons_max_free=0;
123 static int ap_daemons_limit=0;
124 static time_t ap_restart_time=0;
125 static int ap_extended_status = 0;
128 * The max child slot ever assigned, preserved across restarts. Necessary
129 * to deal with MaxClients changes across SIGUSR1 restarts. We use this
130 * value to optimize routines that have to scan the entire scoreboard.
132 static int max_daemons_limit = -1;
134 static char ap_coredump_dir[MAX_STRING_LEN];
136 /* *Non*-shared http_main globals... */
138 static server_rec *server_conf;
139 static ap_socket_t *sd;
140 static fd_set listenfds;
141 static int listenmaxfd;
143 /* one_process --- debugging mode variable; can be set from the command line
144 * with the -X flag. If set, this gets you the child_main loop running
145 * in the process which originally started up (no detach, no make_child),
146 * which is a pretty nice debugging environment. (You'll get a SIGHUP
147 * early in standalone_main; just continue through. This is the server
148 * trying to kill off any child processes which it might have lying
149 * around --- Apache doesn't keep track of their pids, it just sends
150 * SIGHUP to the process group, ignoring it in the root process.
151 * Continue through and you'll be fine.).
154 static int one_process = 0;
156 #ifdef HAS_OTHER_CHILD
157 /* used to maintain list of children which aren't part of the scoreboard */
158 typedef struct other_child_rec other_child_rec;
159 struct other_child_rec {
160 other_child_rec *next;
162 void (*maintenance) (int, void *, ap_wait_t);
166 static other_child_rec *other_children;
169 static ap_context_t *pconf; /* Pool for config stuff */
170 static ap_context_t *pchild; /* Pool for httpd child stuff */
172 static int my_pid; /* it seems silly to call getpid all the time */
174 static int my_child_num;
179 char tpf_server_name[INETD_SERVNAME_LENGTH+1];
182 static scoreboard *ap_scoreboard_image = NULL;
186 * change directory for gprof to plop the gmon.out file
187 * configure in httpd.conf:
188 * GprofDir logs/ -> $ServerRoot/logs/gmon.out
189 * GprofDir logs/% -> $ServerRoot/logs/gprof.$pid/gmon.out
191 static void chdir_for_gprof(void)
193 core_server_config *sconf =
194 ap_get_module_config(server_conf->module_config, &core_module);
195 char *dir = sconf->gprof_dir;
199 int len = strlen(sconf->gprof_dir) - 1;
200 if(*(dir + len) == '%') {
202 ap_snprintf(buf, sizeof(buf), "%sgprof.%d", dir, (int)getpid());
204 dir = ap_server_root_relative(pconf, buf[0] ? buf : dir);
205 if(mkdir(dir, 0755) < 0 && errno != EEXIST) {
206 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
207 "gprof: error creating directory %s", dir);
211 dir = ap_server_root_relative(pconf, "logs");
217 #define chdir_for_gprof()
220 /* a clean exit from a child with proper cleanup */
221 static void clean_child_exit(int code) __attribute__ ((noreturn));
222 static void clean_child_exit(int code)
225 ap_destroy_pool(pchild);
231 #if defined(USE_FCNTL_SERIALIZED_ACCEPT) || defined(USE_FLOCK_SERIALIZED_ACCEPT)
232 static void expand_lock_fname(ap_context_t *p)
234 /* XXXX possibly bogus cast */
235 ap_lock_fname = ap_psprintf(p, "%s.%lu",
236 ap_server_root_relative(p, ap_lock_fname), (unsigned long)getpid());
240 #if defined (USE_USLOCK_SERIALIZED_ACCEPT)
244 static ulock_t uslock = NULL;
246 #define accept_mutex_child_init(x)
248 static void accept_mutex_init(ap_context_t *p)
254 /* default is 8, allocate enough for all the children plus the parent */
255 if ((old = usconfig(CONF_INITUSERS, HARD_SERVER_LIMIT + 1)) == -1) {
256 perror("usconfig(CONF_INITUSERS)");
260 if ((old = usconfig(CONF_LOCKTYPE, US_NODEBUG)) == -1) {
261 perror("usconfig(CONF_LOCKTYPE)");
264 if ((old = usconfig(CONF_ARENATYPE, US_SHAREDONLY)) == -1) {
265 perror("usconfig(CONF_ARENATYPE)");
268 if ((us = usinit("/dev/zero")) == NULL) {
273 if ((uslock = usnewlock(us)) == NULL) {
279 static void accept_mutex_on(void)
281 switch (ussetlock(uslock)) {
286 fprintf(stderr, "didn't get lock\n");
287 clean_child_exit(APEXIT_CHILDFATAL);
290 clean_child_exit(APEXIT_CHILDFATAL);
294 static void accept_mutex_off(void)
296 if (usunsetlock(uslock) == -1) {
297 perror("usunsetlock");
298 clean_child_exit(APEXIT_CHILDFATAL);
302 #elif defined (USE_PTHREAD_SERIALIZED_ACCEPT)
304 /* This code probably only works on Solaris ... but it works really fast
305 * on Solaris. Note that pthread mutexes are *NOT* released when a task
306 * dies ... the task has to free it itself. So we block signals and
307 * try to be nice about releasing the mutex.
312 static pthread_mutex_t *accept_mutex = (void *)(caddr_t) -1;
313 static int have_accept_mutex;
314 static sigset_t accept_block_mask;
315 static sigset_t accept_previous_mask;
317 static void accept_mutex_child_cleanup(void *foo)
319 if (accept_mutex != (void *)(caddr_t)-1
320 && have_accept_mutex) {
321 pthread_mutex_unlock(accept_mutex);
325 static void accept_mutex_child_init(ap_context_t *p)
327 ap_register_cleanup(p, NULL, accept_mutex_child_cleanup, ap_null_cleanup);
330 static void accept_mutex_cleanup(void *foo)
332 if (accept_mutex != (void *)(caddr_t)-1
333 && munmap((caddr_t) accept_mutex, sizeof(*accept_mutex))) {
336 accept_mutex = (void *)(caddr_t)-1;
339 static void accept_mutex_init(ap_context_t *p)
341 pthread_mutexattr_t mattr;
344 fd = open("/dev/zero", O_RDWR);
346 perror("open(/dev/zero)");
349 accept_mutex = (pthread_mutex_t *) mmap((caddr_t) 0, sizeof(*accept_mutex),
350 PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
351 if (accept_mutex == (void *) (caddr_t) - 1) {
356 if ((errno = pthread_mutexattr_init(&mattr))) {
357 perror("pthread_mutexattr_init");
360 if ((errno = pthread_mutexattr_setpshared(&mattr,
361 PTHREAD_PROCESS_SHARED))) {
362 perror("pthread_mutexattr_setpshared");
365 if ((errno = pthread_mutex_init(accept_mutex, &mattr))) {
366 perror("pthread_mutex_init");
369 sigfillset(&accept_block_mask);
370 sigdelset(&accept_block_mask, SIGHUP);
371 sigdelset(&accept_block_mask, SIGTERM);
372 sigdelset(&accept_block_mask, SIGUSR1);
373 ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
376 static void accept_mutex_on(void)
380 if (sigprocmask(SIG_BLOCK, &accept_block_mask, &accept_previous_mask)) {
381 perror("sigprocmask(SIG_BLOCK)");
382 clean_child_exit(APEXIT_CHILDFATAL);
384 if ((err = pthread_mutex_lock(accept_mutex))) {
386 perror("pthread_mutex_lock");
387 clean_child_exit(APEXIT_CHILDFATAL);
389 have_accept_mutex = 1;
392 static void accept_mutex_off(void)
396 if ((err = pthread_mutex_unlock(accept_mutex))) {
398 perror("pthread_mutex_unlock");
399 clean_child_exit(APEXIT_CHILDFATAL);
401 /* There is a slight race condition right here... if we were to die right
402 * now, we'd do another pthread_mutex_unlock. Now, doing that would let
403 * another process into the mutex. pthread mutexes are designed to be
404 * fast, as such they don't have protection for things like testing if the
405 * thread owning a mutex is actually unlocking it (or even any way of
406 * testing who owns the mutex).
408 * If we were to unset have_accept_mutex prior to releasing the mutex
409 * then the race could result in the server unable to serve hits. Doing
410 * it this way means that the server can continue, but an additional
411 * child might be in the critical section ... at least it's still serving
414 have_accept_mutex = 0;
415 if (sigprocmask(SIG_SETMASK, &accept_previous_mask, NULL)) {
416 perror("sigprocmask(SIG_SETMASK)");
421 #elif defined (USE_SYSVSEM_SERIALIZED_ACCEPT)
423 #include <sys/types.h>
427 #ifdef NEED_UNION_SEMUN
428 /* it makes no sense, but this isn't defined on solaris */
431 struct semid_ds *buf;
437 static int sem_id = -1;
438 static struct sembuf op_on;
439 static struct sembuf op_off;
441 /* We get a random semaphore ... the lame sysv semaphore interface
442 * means we have to be sure to clean this up or else we'll leak
445 static void accept_mutex_cleanup(void *foo)
451 /* this is ignored anyhow */
453 semctl(sem_id, 0, IPC_RMID, ick);
456 #define accept_mutex_child_init(x)
458 static void accept_mutex_init(ap_context_t *p)
463 /* acquire the semaphore */
464 sem_id = semget(IPC_PRIVATE, 1, IPC_CREAT | 0600);
470 if (semctl(sem_id, 0, SETVAL, ick) < 0) {
471 perror("semctl(SETVAL)");
475 /* restrict it to use only by the appropriate user_id ... not that this
476 * stops CGIs from acquiring it and dinking around with it.
478 buf.sem_perm.uid = unixd_config.user_id;
479 buf.sem_perm.gid = unixd_config.group_id;
480 buf.sem_perm.mode = 0600;
482 if (semctl(sem_id, 0, IPC_SET, ick) < 0) {
483 perror("semctl(IPC_SET)");
487 ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
489 /* pre ap_context_t nitialize these */
492 op_on.sem_flg = SEM_UNDO;
495 op_off.sem_flg = SEM_UNDO;
498 static void accept_mutex_on(void)
500 while (semop(sem_id, &op_on, 1) < 0) {
501 if (errno != EINTR) {
502 perror("accept_mutex_on");
503 clean_child_exit(APEXIT_CHILDFATAL);
508 static void accept_mutex_off(void)
510 while (semop(sem_id, &op_off, 1) < 0) {
511 if (errno != EINTR) {
512 perror("accept_mutex_off");
513 clean_child_exit(APEXIT_CHILDFATAL);
518 #elif defined(USE_FCNTL_SERIALIZED_ACCEPT)
519 static struct flock lock_it;
520 static struct flock unlock_it;
522 static int lock_fd = -1;
524 #define accept_mutex_child_init(x)
527 * Initialize mutex lock.
528 * Must be safe to call this on a restart.
530 static void accept_mutex_init(ap_context_t *p)
533 lock_it.l_whence = SEEK_SET; /* from current point */
534 lock_it.l_start = 0; /* -"- */
535 lock_it.l_len = 0; /* until end of file */
536 lock_it.l_type = F_WRLCK; /* set exclusive/write lock */
537 lock_it.l_pid = 0; /* pid not actually interesting */
538 unlock_it.l_whence = SEEK_SET; /* from current point */
539 unlock_it.l_start = 0; /* -"- */
540 unlock_it.l_len = 0; /* until end of file */
541 unlock_it.l_type = F_UNLCK; /* set exclusive/write lock */
542 unlock_it.l_pid = 0; /* pid not actually interesting */
544 expand_lock_fname(p);
545 ap_open(&tempfile, p, ap_lock_fname, APR_CREATE | APR_WRITE | APR_EXCL,
546 APR_UREAD | APR_UWRITE | APR_GREAD | APR_WREAD);
547 ap_get_os_file(tempfile, &lock_fd);
550 fprintf(stderr, "Cannot open lock file: %s\n", ap_lock_fname);
553 unlink(ap_lock_fname);
556 static void accept_mutex_on(void)
560 while ((ret = fcntl(lock_fd, F_SETLKW, &lock_it)) < 0 && errno == EINTR) {
565 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
566 "fcntl: F_SETLKW: Error getting accept lock, exiting! "
567 "Perhaps you need to use the LockFile directive to place "
568 "your lock file on a local disk!");
569 clean_child_exit(APEXIT_CHILDFATAL);
573 static void accept_mutex_off(void)
577 while ((ret = fcntl(lock_fd, F_SETLKW, &unlock_it)) < 0 && errno == EINTR) {
581 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
582 "fcntl: F_SETLKW: Error freeing accept lock, exiting! "
583 "Perhaps you need to use the LockFile directive to place "
584 "your lock file on a local disk!");
585 clean_child_exit(APEXIT_CHILDFATAL);
589 #elif defined(USE_FLOCK_SERIALIZED_ACCEPT)
591 static int lock_fd = -1;
593 static ap_status_t accept_mutex_cleanup(void *foo)
595 unlink(ap_lock_fname);
601 * Initialize mutex lock.
602 * Done by each child at it's birth
604 static void accept_mutex_child_init(ap_context_t *p)
608 ap_open(&tempfile, p, ap_lock_fname, APR_WRITE, APR_UREAD|APR_UWRITE);
610 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
611 "Child cannot open lock file: %s", ap_lock_fname);
612 clean_child_exit(APEXIT_CHILDINIT);
614 ap_get_os_file(tempfile, &lock_fd);
618 * Initialize mutex lock.
619 * Must be safe to call this on a restart.
621 static void accept_mutex_init(ap_context_t *p)
625 expand_lock_fname(p);
626 unlink(ap_lock_fname);
627 ap_open(&tempfile, p, ap_lock_fname, APR_CREATE|APR_WRITE|APR_EXCL,
628 APR_UREAD|APR_UWRITE);
630 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
631 "Parent cannot open lock file: %s", ap_lock_fname);
634 ap_get_os_file(tempfile, &lock_fd);
635 ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
638 static void accept_mutex_on(void)
642 while ((ret = flock(lock_fd, LOCK_EX)) < 0 && errno == EINTR)
646 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
647 "flock: LOCK_EX: Error getting accept lock. Exiting!");
648 clean_child_exit(APEXIT_CHILDFATAL);
652 static void accept_mutex_off(void)
654 if (flock(lock_fd, LOCK_UN) < 0) {
655 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
656 "flock: LOCK_UN: Error freeing accept lock. Exiting!");
657 clean_child_exit(APEXIT_CHILDFATAL);
661 #elif defined(USE_OS2SEM_SERIALIZED_ACCEPT)
663 static HMTX lock_sem = -1;
665 static void accept_mutex_cleanup(void *foo)
667 DosReleaseMutexSem(lock_sem);
668 DosCloseMutexSem(lock_sem);
672 * Initialize mutex lock.
673 * Done by each child at it's birth
675 static void accept_mutex_child_init(ap_context_t *p)
677 int rc = DosOpenMutexSem(NULL, &lock_sem);
680 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
681 "Child cannot open lock semaphore, rc=%d", rc);
682 clean_child_exit(APEXIT_CHILDINIT);
684 ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
689 * Initialize mutex lock.
690 * Must be safe to call this on a restart.
692 static void accept_mutex_init(ap_context_t *p)
694 int rc = DosCreateMutexSem(NULL, &lock_sem, DC_SEM_SHARED, FALSE);
697 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
698 "Parent cannot create lock semaphore, rc=%d", rc);
702 ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
705 static void accept_mutex_on(void)
707 int rc = DosRequestMutexSem(lock_sem, SEM_INDEFINITE_WAIT);
710 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
711 "OS2SEM: Error %d getting accept lock. Exiting!", rc);
712 clean_child_exit(APEXIT_CHILDFATAL);
716 static void accept_mutex_off(void)
718 int rc = DosReleaseMutexSem(lock_sem);
721 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
722 "OS2SEM: Error %d freeing accept lock. Exiting!", rc);
723 clean_child_exit(APEXIT_CHILDFATAL);
727 #elif defined(USE_TPF_CORE_SERIALIZED_ACCEPT)
729 static int tpf_core_held;
731 static void accept_mutex_cleanup(void *foo)
737 #define accept_mutex_init(x)
739 static void accept_mutex_child_init(ap_context_t *p)
741 ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
745 static void accept_mutex_on(void)
752 static void accept_mutex_off(void)
760 /* Default --- no serialization. Other methods *could* go here,
763 #if !defined(MULTITHREAD)
764 /* Multithreaded systems don't complete between processes for
766 #define NO_SERIALIZED_ACCEPT
767 #define accept_mutex_child_init(x)
768 #define accept_mutex_init(x)
769 #define accept_mutex_on()
770 #define accept_mutex_off()
774 /* On some architectures it's safe to do unserialized accept()s in the single
775 * Listen case. But it's never safe to do it in the case where there's
776 * multiple Listen statements. Define SINGLE_LISTEN_UNSERIALIZED_ACCEPT
777 * when it's safe in the single Listen case.
779 #ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
780 #define SAFE_ACCEPT(stmt) do {if (ap_listeners->next) {stmt;}} while(0)
782 #define SAFE_ACCEPT(stmt) do {stmt;} while(0)
786 /*****************************************************************
787 * dealing with other children
790 #ifdef HAS_OTHER_CHILD
791 API_EXPORT(void) ap_register_other_child(int pid,
792 void (*maintenance) (int reason, void *, ap_wait_t status),
793 void *data, int write_fd)
795 other_child_rec *ocr;
797 ocr = ap_palloc(pconf, sizeof(*ocr));
799 ocr->maintenance = maintenance;
801 ocr->write_fd = write_fd;
802 ocr->next = other_children;
803 other_children = ocr;
806 /* note that since this can be called by a maintenance function while we're
807 * scanning the other_children list, all scanners should protect themself
808 * by loading ocr->next before calling any maintenance function.
810 API_EXPORT(void) ap_unregister_other_child(void *data)
812 other_child_rec **pocr, *nocr;
814 for (pocr = &other_children; *pocr; pocr = &(*pocr)->next) {
815 if ((*pocr)->data == data) {
816 nocr = (*pocr)->next;
817 (*(*pocr)->maintenance) (OC_REASON_UNREGISTER, (*pocr)->data, -1);
819 /* XXX: um, well we've just wasted some space in pconf ? */
825 /* test to ensure that the write_fds are all still writable, otherwise
826 * invoke the maintenance functions as appropriate */
827 static void probe_writable_fds(void)
831 other_child_rec *ocr, *nocr;
835 if (other_children == NULL)
839 FD_ZERO(&writable_fds);
841 for (ocr = other_children; ocr; ocr = ocr->next) {
842 if (ocr->write_fd == -1)
844 FD_SET(ocr->write_fd, &writable_fds);
845 if (ocr->write_fd > fd_max) {
846 fd_max = ocr->write_fd;
854 rc = ap_select(fd_max + 1, NULL, &writable_fds, NULL, &tv);
855 } while (rc == -1 && errno == EINTR);
858 /* XXX: uhh this could be really bad, we could have a bad file
859 * descriptor due to a bug in one of the maintenance routines */
860 ap_log_unixerr("probe_writable_fds", "select",
861 "could not probe writable fds", server_conf);
867 for (ocr = other_children; ocr; ocr = nocr) {
869 if (ocr->write_fd == -1)
871 if (FD_ISSET(ocr->write_fd, &writable_fds))
873 (*ocr->maintenance) (OC_REASON_UNWRITABLE, ocr->data, -1);
877 /* possibly reap an other_child, return 0 if yes, -1 if not */
878 static int reap_other_child(int pid, ap_wait_t status)
880 other_child_rec *ocr, *nocr;
882 for (ocr = other_children; ocr; ocr = nocr) {
887 (*ocr->maintenance) (OC_REASON_DEATH, ocr->data, status);
894 /*****************************************************************
896 * Dealing with the scoreboard... a lot of these variables are global
897 * only to avoid getting clobbered by the longjmp() that happens when
898 * a hard timeout expires...
900 * We begin with routines which deal with the file itself...
903 #if defined(USE_OS2_SCOREBOARD)
905 /* The next two routines are used to access shared memory under OS/2. */
906 /* This requires EMX v09c to be installed. */
908 caddr_t create_shared_heap(const char *name, size_t size)
914 rc = DosAllocSharedMem(&mem, name, size,
915 PAG_COMMIT | PAG_READ | PAG_WRITE);
918 h = _ucreate(mem, size, !_BLOCK_CLEAN, _HEAP_REGULAR | _HEAP_SHARED,
925 caddr_t get_shared_heap(const char *Name)
928 PVOID BaseAddress; /* Pointer to the base address of
929 the shared memory object */
930 ULONG AttributeFlags; /* Flags describing characteristics
931 of the shared memory object */
932 APIRET rc; /* Return code */
934 /* Request read and write access to */
935 /* the shared memory object */
936 AttributeFlags = PAG_WRITE | PAG_READ;
938 rc = DosGetNamedSharedMem(&BaseAddress, Name, AttributeFlags);
941 printf("DosGetNamedSharedMem error: return code = %ld", rc);
948 static void setup_shared_mem(ap_context_t *p)
954 m = (caddr_t) create_shared_heap("\\SHAREMEM\\SCOREBOARD", SCOREBOARD_SIZE);
956 fprintf(stderr, "%s: Could not create OS/2 Shared memory pool.\n",
961 rc = _uopen((Heap_t) m);
964 "%s: Could not uopen() newly created OS/2 Shared memory pool.\n",
967 ap_scoreboard_image = (scoreboard *) m;
968 ap_scoreboard_image->global.running_generation = 0;
971 static void reopen_scoreboard(ap_context_t *p)
976 m = (caddr_t) get_shared_heap("\\SHAREMEM\\SCOREBOARD");
978 fprintf(stderr, "%s: Could not find existing OS/2 Shared memory pool.\n",
983 rc = _uopen((Heap_t) m);
984 ap_scoreboard_image = (scoreboard *) m;
987 #elif defined(USE_POSIX_SCOREBOARD)
988 #include <sys/mman.h>
993 * As of version 4.23A, shared memory in QNX must reside under /dev/shmem,
994 * where no subdirectories allowed.
996 * POSIX shm_open() and shm_unlink() will take care about this issue,
997 * but to avoid confusion, I suggest to redefine scoreboard file name
998 * in httpd.conf to cut "logs/" from it. With default setup actual name
999 * will be "/dev/shmem/logs.apache_status".
1001 * If something went wrong and Apache did not unlinked this object upon
1002 * exit, you can remove it manually, using "rm -f" command.
1005 * <sys/mman.h> in QNX defines MAP_ANON, but current implementation
1006 * does NOT support BSD style anonymous mapping. So, the order of
1007 * conditional compilation is important:
1008 * this #ifdef section must be ABOVE the next one (BSD style).
1010 * I tested this stuff and it works fine for me, but if it provides
1011 * trouble for you, just comment out USE_MMAP_SCOREBOARD in QNX section
1015 * Igor N. Kovalenko -- infoh@mail.wplus.net
1018 static void cleanup_shared_mem(void *d)
1020 shm_unlink(ap_scoreboard_fname);
1023 static void setup_shared_mem(ap_context_t *p)
1029 fd = shm_open(ap_scoreboard_fname, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
1031 ap_snprintf(buf, sizeof(buf), "%s: could not open(create) scoreboard",
1036 if (ltrunc(fd, (off_t) SCOREBOARD_SIZE, SEEK_SET) == -1) {
1037 ap_snprintf(buf, sizeof(buf), "%s: could not ltrunc scoreboard",
1040 shm_unlink(ap_scoreboard_fname);
1043 if ((m = (caddr_t) mmap((caddr_t) 0,
1044 (size_t) SCOREBOARD_SIZE, PROT_READ | PROT_WRITE,
1045 MAP_SHARED, fd, (off_t) 0)) == (caddr_t) - 1) {
1046 ap_snprintf(buf, sizeof(buf), "%s: cannot mmap scoreboard",
1049 shm_unlink(ap_scoreboard_fname);
1053 ap_register_cleanup(p, NULL, cleanup_shared_mem, ap_null_cleanup);
1054 ap_scoreboard_image = (scoreboard *) m;
1055 ap_scoreboard_image->global.running_generation = 0;
1058 static void reopen_scoreboard(ap_context_t *p)
1062 #elif defined(USE_MMAP_SCOREBOARD)
1064 static void setup_shared_mem(ap_context_t *p)
1068 #if defined(MAP_ANON)
1072 * 9-Aug-97 - Jeff Venters (venters@convex.hp.com)
1073 * ConvexOS maps address space as follows:
1074 * 0x00000000 - 0x7fffffff : Kernel
1075 * 0x80000000 - 0xffffffff : User
1076 * Start mmapped area 1GB above start of text.
1078 * Also, the length requires a pointer as the actual length is
1079 * returned (rounded up to a page boundary).
1082 unsigned len = SCOREBOARD_SIZE;
1084 m = mmap((caddr_t) 0xC0000000, &len,
1085 PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, NOFD, 0);
1087 #elif defined(MAP_TMPFILE)
1089 char mfile[] = "/tmp/apache_shmem_XXXX";
1090 int fd = mkstemp(mfile);
1093 fprintf(stderr, "%s: Could not open %s\n", ap_server_argv0, mfile);
1096 m = mmap((caddr_t) 0, SCOREBOARD_SIZE,
1097 PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
1098 if (m == (caddr_t) - 1) {
1100 fprintf(stderr, "%s: Could not mmap %s\n", ap_server_argv0, mfile);
1107 m = mmap((caddr_t) 0, SCOREBOARD_SIZE,
1108 PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0);
1110 if (m == (caddr_t) - 1) {
1112 fprintf(stderr, "%s: Could not mmap memory\n", ap_server_argv0);
1119 fd = open("/dev/zero", O_RDWR);
1122 fprintf(stderr, "%s: Could not open /dev/zero\n", ap_server_argv0);
1125 m = mmap((caddr_t) 0, SCOREBOARD_SIZE,
1126 PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
1127 if (m == (caddr_t) - 1) {
1129 fprintf(stderr, "%s: Could not mmap /dev/zero\n", ap_server_argv0);
1134 ap_scoreboard_image = (scoreboard *) m;
1135 ap_scoreboard_image->global.running_generation = 0;
1138 static void reopen_scoreboard(ap_context_t *p)
1142 #elif defined(USE_SHMGET_SCOREBOARD)
1143 static key_t shmkey = IPC_PRIVATE;
1144 static int shmid = -1;
1146 static void setup_shared_mem(ap_context_t *p)
1148 struct shmid_ds shmbuf;
1153 if ((shmid = shmget(shmkey, SCOREBOARD_SIZE, IPC_CREAT | SHM_R | SHM_W)) == -1) {
1155 if (errno == ENOSYS) {
1156 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
1157 "Your kernel was built without CONFIG_SYSVIPC\n"
1158 "%s: Please consult the Apache FAQ for details",
1162 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
1163 "could not call shmget");
1167 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, server_conf,
1168 "created shared memory segment #%d", shmid);
1172 * Some SysV systems place the shared segment WAY too close
1173 * to the dynamic memory break point (sbrk(0)). This severely
1174 * limits the use of malloc/sbrk in the program since sbrk will
1175 * refuse to move past that point.
1177 * To get around this, we move the break point "way up there",
1178 * attach the segment and then move break back down. Ugly
1180 if ((obrk = sbrk(MOVEBREAK)) == (char *) -1) {
1181 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
1182 "sbrk() could not move break");
1186 #define BADSHMAT ((scoreboard *)(-1))
1187 if ((ap_scoreboard_image = (scoreboard *) shmat(shmid, 0, 0)) == BADSHMAT) {
1188 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf, "shmat error");
1190 * We exit below, after we try to remove the segment
1193 else { /* only worry about permissions if we attached the segment */
1194 if (shmctl(shmid, IPC_STAT, &shmbuf) != 0) {
1195 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
1196 "shmctl() could not stat segment #%d", shmid);
1199 shmbuf.shm_perm.uid = unixd_config.user_id;
1200 shmbuf.shm_perm.gid = unixd_config.group_id;
1201 if (shmctl(shmid, IPC_SET, &shmbuf) != 0) {
1202 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
1203 "shmctl() could not set segment #%d", shmid);
1208 * We must avoid leaving segments in the kernel's
1211 if (shmctl(shmid, IPC_RMID, NULL) != 0) {
1212 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf,
1213 "shmctl: IPC_RMID: could not remove shared memory segment #%d",
1216 if (ap_scoreboard_image == BADSHMAT) /* now bailout */
1220 if (obrk == (char *) -1)
1221 return; /* nothing else to do */
1222 if (sbrk(-(MOVEBREAK)) == (char *) -1) {
1223 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
1224 "sbrk() could not move break back");
1227 ap_scoreboard_image->global.running_generation = 0;
1230 static void reopen_scoreboard(ap_context_t *p)
1234 #elif defined(USE_TPF_SCOREBOARD)
1236 static void cleanup_scoreboard_heap()
1239 rv = rsysc(ap_scoreboard_image, SCOREBOARD_FRAMES, SCOREBOARD_NAME);
1240 if(rv == RSYSC_ERROR) {
1241 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
1242 "rsysc() could not release scoreboard system heap");
1246 static void setup_shared_mem(ap_context_t *p)
1248 cinfc(CINFC_WRITE, CINFC_CMMCTK2);
1249 ap_scoreboard_image = (scoreboard *) gsysc(SCOREBOARD_FRAMES, SCOREBOARD_NAME);
1251 if (!ap_scoreboard_image) {
1252 fprintf(stderr, "httpd: Could not create scoreboard system heap storage.\n");
1256 ap_register_cleanup(p, NULL, cleanup_scoreboard_heap, ap_null_cleanup);
1257 ap_scoreboard_image->global.running_generation = 0;
1260 static void reopen_scoreboard(ap_context_t *p)
1262 cinfc(CINFC_WRITE, CINFC_CMMCTK2);
1266 #define SCOREBOARD_FILE
1267 static scoreboard _scoreboard_image;
1268 static int scoreboard_fd = -1;
1270 /* XXX: things are seriously screwed if we ever have to do a partial
1271 * read or write ... we could get a corrupted scoreboard
1273 static int force_write(int fd, void *buffer, int bufsz)
1275 int rv, orig_sz = bufsz;
1278 rv = write(fd, buffer, bufsz);
1280 buffer = (char *) buffer + rv;
1283 } while ((rv > 0 && bufsz > 0) || (rv == -1 && errno == EINTR));
1285 return rv < 0 ? rv : orig_sz - bufsz;
1288 static int force_read(int fd, void *buffer, int bufsz)
1290 int rv, orig_sz = bufsz;
1293 rv = read(fd, buffer, bufsz);
1295 buffer = (char *) buffer + rv;
1298 } while ((rv > 0 && bufsz > 0) || (rv == -1 && errno == EINTR));
1300 return rv < 0 ? rv : orig_sz - bufsz;
1303 static void cleanup_scoreboard_file(void *foo)
1305 unlink(ap_scoreboard_fname);
1308 void reopen_scoreboard(ap_context_t *p)
1310 if (scoreboard_fd != -1)
1311 ap_pclosef(p, scoreboard_fd);
1314 ap_scoreboard_fname = ap_server_root_relative(p, ap_scoreboard_fname);
1316 scoreboard_fd = ap_popenf(p, ap_scoreboard_fname, O_CREAT | O_BINARY | O_RDWR, 0666);
1317 if (scoreboard_fd == -1) {
1318 perror(ap_scoreboard_fname);
1319 fprintf(stderr, "Cannot open scoreboard file:\n");
1320 clean_child_exit(1);
1325 /* Called by parent process */
1326 static void reinit_scoreboard(ap_context_t *p)
1328 int running_gen = 0;
1329 if (ap_scoreboard_image)
1330 running_gen = ap_scoreboard_image->global.running_generation;
1332 #ifndef SCOREBOARD_FILE
1333 if (ap_scoreboard_image == NULL) {
1334 setup_shared_mem(p);
1336 memset(ap_scoreboard_image, 0, SCOREBOARD_SIZE);
1337 ap_scoreboard_image->global.running_generation = running_gen;
1339 ap_scoreboard_image = &_scoreboard_image;
1340 ap_scoreboard_fname = ap_server_root_relative(p, ap_scoreboard_fname);
1342 scoreboard_fd = ap_popenf(p, ap_scoreboard_fname, O_CREAT | O_BINARY | O_RDWR, 0644);
1343 if (scoreboard_fd == -1) {
1344 perror(ap_scoreboard_fname);
1345 fprintf(stderr, "Cannot open scoreboard file:\n");
1348 ap_register_cleanup(p, NULL, cleanup_scoreboard_file, ap_null_cleanup);
1350 memset((char *) ap_scoreboard_image, 0, sizeof(*ap_scoreboard_image));
1351 ap_scoreboard_image->global.running_generation = running_gen;
1352 force_write(scoreboard_fd, ap_scoreboard_image, sizeof(*ap_scoreboard_image));
1356 /* Routines called to deal with the scoreboard image
1357 * --- note that we do *not* need write locks, since update_child_status
1358 * only updates a *single* record in place, and only one process writes to
1359 * a given scoreboard slot at a time (either the child process owning that
1360 * slot, or the parent, noting that the child has died).
1362 * As a final note --- setting the score entry to getpid() is always safe,
1363 * since when the parent is writing an entry, it's only noting SERVER_DEAD
1367 ap_inline void ap_sync_scoreboard_image(void)
1369 #ifdef SCOREBOARD_FILE
1370 lseek(scoreboard_fd, 0L, 0);
1371 force_read(scoreboard_fd, ap_scoreboard_image, sizeof(*ap_scoreboard_image));
1375 API_EXPORT(int) ap_exists_scoreboard_image(void)
1377 return (ap_scoreboard_image ? 1 : 0);
1380 static ap_inline void put_scoreboard_info(int child_num,
1381 short_score *new_score_rec)
1383 #ifdef SCOREBOARD_FILE
1384 lseek(scoreboard_fd, (long) child_num * sizeof(short_score), 0);
1385 force_write(scoreboard_fd, new_score_rec, sizeof(short_score));
1389 int ap_update_child_status(int child_num, int status, request_rec *r)
1399 ap_sync_scoreboard_image();
1400 ss = &ap_scoreboard_image->servers[child_num];
1401 old_status = ss->status;
1402 ss->status = status;
1404 if (ap_extended_status) {
1405 if (status == SERVER_READY || status == SERVER_DEAD) {
1407 * Reset individual counters
1409 if (status == SERVER_DEAD) {
1410 ss->my_access_count = 0L;
1411 ss->my_bytes_served = 0L;
1413 ss->conn_count = (unsigned short) 0;
1414 ss->conn_bytes = (unsigned long) 0;
1417 conn_rec *c = r->connection;
1418 ap_cpystrn(ss->client, ap_get_remote_host(c, r->per_dir_config,
1419 REMOTE_NOLOOKUP), sizeof(ss->client));
1420 if (r->the_request == NULL) {
1421 ap_cpystrn(ss->request, "NULL", sizeof(ss->request));
1422 } else if (r->parsed_uri.password == NULL) {
1423 ap_cpystrn(ss->request, r->the_request, sizeof(ss->request));
1425 /* Don't reveal the password in the server-status view */
1426 ap_cpystrn(ss->request, ap_pstrcat(r->pool, r->method, " ",
1427 ap_unparse_uri_components(r->pool, &r->parsed_uri, UNP_OMITPASSWORD),
1428 r->assbackwards ? NULL : " ", r->protocol, NULL),
1429 sizeof(ss->request));
1431 ss->vhostrec = r->server;
1434 if (status == SERVER_STARTING && r == NULL) {
1435 /* clean up the slot's vhostrec pointer (maybe re-used)
1436 * and mark the slot as belonging to a new generation.
1438 ss->vhostrec = NULL;
1439 ap_scoreboard_image->parent[child_num].generation = ap_my_generation;
1440 #ifdef SCOREBOARD_FILE
1441 lseek(scoreboard_fd, XtOffsetOf(scoreboard, parent[child_num]), 0);
1442 force_write(scoreboard_fd, &ap_scoreboard_image->parent[child_num],
1443 sizeof(parent_score));
1446 put_scoreboard_info(child_num, ss);
1451 static void update_scoreboard_global(void)
1453 #ifdef SCOREBOARD_FILE
1454 lseek(scoreboard_fd,
1455 (char *) &ap_scoreboard_image->global -(char *) ap_scoreboard_image, 0);
1456 force_write(scoreboard_fd, &ap_scoreboard_image->global,
1457 sizeof ap_scoreboard_image->global);
1461 void ap_time_process_request(int child_num, int status)
1464 #if defined(NO_GETTIMEOFDAY) && !defined(NO_TIMES)
1471 ap_sync_scoreboard_image();
1472 ss = &ap_scoreboard_image->servers[child_num];
1474 if (status == START_PREQUEST) {
1475 #if defined(NO_GETTIMEOFDAY)
1477 if ((ss->start_time = times(&tms_blk)) == -1)
1478 #endif /* NO_TIMES */
1479 ss->start_time = (clock_t) 0;
1481 if (gettimeofday(&ss->start_time, (struct timezone *) 0) < 0)
1482 ss->start_time.tv_sec =
1483 ss->start_time.tv_usec = 0L;
1486 else if (status == STOP_PREQUEST) {
1487 #if defined(NO_GETTIMEOFDAY)
1489 if ((ss->stop_time = times(&tms_blk)) == -1)
1491 ss->stop_time = ss->start_time = (clock_t) 0;
1493 if (gettimeofday(&ss->stop_time, (struct timezone *) 0) < 0)
1494 ss->stop_time.tv_sec =
1495 ss->stop_time.tv_usec =
1496 ss->start_time.tv_sec =
1497 ss->start_time.tv_usec = 0L;
1502 put_scoreboard_info(child_num, ss);
1506 static void increment_counts(int child_num, request_rec *r)
1511 ap_sync_scoreboard_image();
1512 ss = &ap_scoreboard_image->servers[child_num];
1515 ap_bgetopt(r->connection->client, BO_BYTECT, &bs);
1521 ss->my_access_count++;
1523 ss->bytes_served += (unsigned long) bs;
1524 ss->my_bytes_served += (unsigned long) bs;
1525 ss->conn_bytes += (unsigned long) bs;
1527 put_scoreboard_info(child_num, ss);
1531 static int find_child_by_pid(int pid)
1535 for (i = 0; i < max_daemons_limit; ++i)
1536 if (ap_scoreboard_image->parent[i].pid == pid)
1542 static void reclaim_child_processes(int terminate)
1546 long int waittime = 1024 * 16; /* in usecs */
1550 #ifdef HAS_OTHER_CHILD
1551 other_child_rec *ocr, *nocr;
1554 ap_sync_scoreboard_image();
1556 for (tries = terminate ? 4 : 1; tries <= 9; ++tries) {
1557 /* don't want to hold up progress any more than
1558 * necessary, but we need to allow children a few moments to exit.
1559 * Set delay with an exponential backoff.
1561 tv.tv_sec = waittime / 1000000;
1562 tv.tv_usec = waittime % 1000000;
1563 waittime = waittime * 4;
1564 ap_select(0, NULL, NULL, NULL, &tv);
1566 /* now see who is done */
1568 for (i = 0; i < max_daemons_limit; ++i) {
1569 int pid = ap_scoreboard_image->parent[i].pid;
1571 if (pid == my_pid || pid == 0)
1574 waitret = waitpid(pid, &status, WNOHANG);
1575 if (waitret == pid || waitret == -1) {
1576 ap_scoreboard_image->parent[i].pid = 0;
1585 /* perhaps it missed the SIGHUP, lets try again */
1586 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
1588 "child process %d did not exit, sending another SIGHUP",
1591 waittime = 1024 * 16;
1597 case 7: /* 1.4sec */
1598 /* ok, now it's being annoying */
1599 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
1601 "child process %d still did not exit, sending a SIGTERM",
1606 /* die child scum */
1607 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, server_conf,
1608 "child process %d still did not exit, sending a SIGKILL",
1612 case 9: /* 14 sec */
1613 /* gave it our best shot, but alas... If this really
1614 * is a child we are trying to kill and it really hasn't
1615 * exited, we will likely fail to bind to the port
1616 * after the restart.
1618 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, server_conf,
1619 "could not make child process %d exit, "
1620 "attempting to continue anyway", pid);
1624 #ifdef HAS_OTHER_CHILD
1625 for (ocr = other_children; ocr; ocr = nocr) {
1630 waitret = waitpid(ocr->pid, &status, WNOHANG);
1631 if (waitret == ocr->pid) {
1633 (*ocr->maintenance) (OC_REASON_DEATH, ocr->data, status);
1635 else if (waitret == 0) {
1636 (*ocr->maintenance) (OC_REASON_RESTART, ocr->data, -1);
1639 else if (waitret == -1) {
1640 /* uh what the heck? they didn't call unregister? */
1642 (*ocr->maintenance) (OC_REASON_LOST, ocr->data, -1);
1646 if (!not_dead_yet) {
1647 /* nothing left to wait for */
1651 #endif /* ndef MULTITHREAD */
1655 #if defined(NEED_WAITPID)
1657 Systems without a real waitpid sometimes lose a child's exit while waiting
1658 for another. Search through the scoreboard for missing children.
1660 int reap_children(ap_wait_t *status)
1664 for (n = 0; n < max_daemons_limit; ++n) {
1665 ap_sync_scoreboard_image();
1666 if (ap_scoreboard_image->servers[n].status != SERVER_DEAD &&
1667 kill((pid = ap_scoreboard_image->parent[n].pid), 0) == -1) {
1668 ap_update_child_status(n, SERVER_DEAD, NULL);
1669 /* just mark it as having a successful exit status */
1670 bzero((char *) status, sizeof(ap_wait_t));
1678 /* Finally, this routine is used by the caretaker process to wait for
1682 /* number of calls to wait_or_timeout between writable probes */
1683 #ifndef INTERVAL_OF_WRITABLE_PROBES
1684 #define INTERVAL_OF_WRITABLE_PROBES 10
1686 static int wait_or_timeout_counter;
1688 static int wait_or_timeout(ap_wait_t *status)
1693 ++wait_or_timeout_counter;
1694 if (wait_or_timeout_counter == INTERVAL_OF_WRITABLE_PROBES) {
1695 wait_or_timeout_counter = 0;
1696 #ifdef HAS_OTHER_CHILD
1697 probe_writable_fds();
1700 ret = waitpid(-1, status, WNOHANG);
1701 if (ret == -1 && errno == EINTR) {
1708 if ((ret = reap_children(status)) > 0) {
1712 tv.tv_sec = SCOREBOARD_MAINTENANCE_INTERVAL / 1000000;
1713 tv.tv_usec = SCOREBOARD_MAINTENANCE_INTERVAL % 1000000;
1714 ap_select(0, NULL, NULL, NULL, &tv);
1718 /* handle all varieties of core dumping signals */
1719 static void sig_coredump(int sig)
1721 chdir(ap_coredump_dir);
1722 signal(sig, SIG_DFL);
1723 kill(getpid(), sig);
1724 /* At this point we've got sig blocked, because we're still inside
1725 * the signal handler. When we leave the signal handler it will
1726 * be unblocked, and we'll take the signal... and coredump or whatever
1727 * is appropriate for this particular Unix. In addition the parent
1728 * will see the real signal we received -- whereas if we called
1729 * abort() here, the parent would only see SIGABRT.
1733 /*****************************************************************
1734 * Connection structures and accounting...
1737 static void just_die(int sig)
1739 clean_child_exit(0);
1742 static int volatile deferred_die;
1743 static int volatile usr1_just_die;
1745 static void usr1_handler(int sig)
1747 if (usr1_just_die) {
1753 /* volatile just in case */
1754 static int volatile shutdown_pending;
1755 static int volatile restart_pending;
1756 static int volatile is_graceful;
1757 ap_generation_t volatile ap_my_generation=0;
1759 static void sig_term(int sig)
1761 if (shutdown_pending == 1) {
1762 /* Um, is this _probably_ not an error, if the user has
1763 * tried to do a shutdown twice quickly, so we won't
1764 * worry about reporting it.
1768 shutdown_pending = 1;
1771 static void restart(int sig)
1773 if (restart_pending == 1) {
1774 /* Probably not an error - don't bother reporting it */
1777 restart_pending = 1;
1778 is_graceful = sig == SIGUSR1;
1781 static void set_signals(void)
1783 #ifndef NO_USE_SIGACTION
1784 struct sigaction sa;
1786 sigemptyset(&sa.sa_mask);
1790 sa.sa_handler = sig_coredump;
1791 #if defined(SA_ONESHOT)
1792 sa.sa_flags = SA_ONESHOT;
1793 #elif defined(SA_RESETHAND)
1794 sa.sa_flags = SA_RESETHAND;
1796 if (sigaction(SIGSEGV, &sa, NULL) < 0)
1797 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGSEGV)");
1799 if (sigaction(SIGBUS, &sa, NULL) < 0)
1800 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGBUS)");
1803 if (sigaction(SIGABORT, &sa, NULL) < 0)
1804 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGABORT)");
1807 if (sigaction(SIGABRT, &sa, NULL) < 0)
1808 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGABRT)");
1811 if (sigaction(SIGILL, &sa, NULL) < 0)
1812 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGILL)");
1816 sa.sa_handler = sig_term;
1817 if (sigaction(SIGTERM, &sa, NULL) < 0)
1818 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGTERM)");
1820 if (sigaction(SIGINT, &sa, NULL) < 0)
1821 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGINT)");
1824 sa.sa_handler = SIG_DFL;
1825 if (sigaction(SIGXCPU, &sa, NULL) < 0)
1826 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGXCPU)");
1829 sa.sa_handler = SIG_DFL;
1830 if (sigaction(SIGXFSZ, &sa, NULL) < 0)
1831 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGXFSZ)");
1834 sa.sa_handler = SIG_IGN;
1835 if (sigaction(SIGPIPE, &sa, NULL) < 0)
1836 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGPIPE)");
1839 /* we want to ignore HUPs and USR1 while we're busy processing one */
1840 sigaddset(&sa.sa_mask, SIGHUP);
1841 sigaddset(&sa.sa_mask, SIGUSR1);
1842 sa.sa_handler = restart;
1843 if (sigaction(SIGHUP, &sa, NULL) < 0)
1844 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGHUP)");
1845 if (sigaction(SIGUSR1, &sa, NULL) < 0)
1846 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGUSR1)");
1849 signal(SIGSEGV, sig_coredump);
1851 signal(SIGBUS, sig_coredump);
1854 signal(SIGABORT, sig_coredump);
1855 #endif /* SIGABORT */
1857 signal(SIGABRT, sig_coredump);
1858 #endif /* SIGABRT */
1860 signal(SIGILL, sig_coredump);
1863 signal(SIGXCPU, SIG_DFL);
1864 #endif /* SIGXCPU */
1866 signal(SIGXFSZ, SIG_DFL);
1867 #endif /* SIGXFSZ */
1870 signal(SIGTERM, sig_term);
1872 signal(SIGHUP, restart);
1875 signal(SIGUSR1, restart);
1876 #endif /* SIGUSR1 */
1878 signal(SIGPIPE, SIG_IGN);
1879 #endif /* SIGPIPE */
1884 #if defined(TCP_NODELAY) && !defined(MPE) && !defined(TPF)
1885 static void sock_disable_nagle(int s)
1887 /* The Nagle algorithm says that we should delay sending partial
1888 * packets in hopes of getting more data. We don't want to do
1889 * this; we are not telnet. There are bad interactions between
1890 * persistent connections and Nagle's algorithm that have very severe
1891 * performance penalties. (Failing to disable Nagle is not much of a
1892 * problem with simple HTTP.)
1894 * In spite of these problems, failure here is not a shooting offense.
1896 int just_say_no = 1;
1898 if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (char *) &just_say_no,
1900 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf,
1901 "setsockopt: (TCP_NODELAY)");
1906 #define sock_disable_nagle(s) /* NOOP */
1910 /*****************************************************************
1911 * Child process main loop.
1912 * The following vars are static to avoid getting clobbered by longjmp();
1913 * they are really private to child_main.
1917 static ap_socket_t *csd;
1918 static int requests_this_child;
1919 static fd_set main_fds;
1921 API_EXPORT(void) ap_child_terminate(request_rec *r)
1923 r->connection->keepalive = 0;
1924 requests_this_child = ap_max_requests_per_child = 1;
1927 int ap_graceful_stop_signalled(void)
1929 ap_sync_scoreboard_image();
1931 ap_scoreboard_image->global.running_generation != ap_my_generation) {
1937 static void child_main(int child_num_arg)
1940 struct sockaddr sa_server;
1941 struct sockaddr sa_client;
1943 ap_listen_rec *last_lr;
1944 ap_listen_rec *first_lr;
1945 ap_context_t *ptrans;
1946 conn_rec *current_conn;
1953 my_child_num = child_num_arg;
1954 requests_this_child = 0;
1957 /* Get a sub ap_context_t for global allocations in this child, so that
1958 * we can have cleanups occur when the child exits.
1960 ap_create_context(&pchild, pconf);
1962 ap_create_context(&ptrans, pchild);
1964 /* needs to be done before we switch UIDs so we have permissions */
1965 reopen_scoreboard(pchild);
1966 SAFE_ACCEPT(accept_mutex_child_init(pchild));
1968 if (unixd_setup_child()) {
1969 clean_child_exit(APEXIT_CHILDFATAL);
1972 ap_child_init_hook(pchild, server_conf);
1974 (void) ap_update_child_status(my_child_num, SERVER_READY, (request_rec *) NULL);
1976 signal(SIGHUP, just_die);
1977 signal(SIGTERM, just_die);
1980 /* Stop Ctrl-C/Ctrl-Break signals going to child processes */
1982 unsigned long ulTimes;
1983 DosSetSignalExceptionFocus(0, &ulTimes);
1987 while (!ap_graceful_stop_signalled()) {
1990 /* Prepare to receive a SIGUSR1 due to graceful restart so that
1991 * we can exit cleanly.
1994 signal(SIGUSR1, usr1_handler);
1997 * (Re)initialize this child to a pre-connection state.
2000 current_conn = NULL;
2002 ap_clear_pool(ptrans);
2004 if ((ap_max_requests_per_child > 0
2005 && requests_this_child++ >= ap_max_requests_per_child)) {
2006 clean_child_exit(0);
2009 (void) ap_update_child_status(my_child_num, SERVER_READY, (request_rec *) NULL);
2012 * Wait for an acceptable connection to arrive.
2015 /* Lock around "accept", if necessary */
2016 SAFE_ACCEPT(accept_mutex_on());
2019 if (ap_listeners->next) {
2020 /* more than one socket */
2021 memcpy(&main_fds, &listenfds, sizeof(fd_set));
2022 srv = ap_select(listenmaxfd + 1, &main_fds, NULL, NULL, NULL);
2024 if (srv < 0 && errno != EINTR) {
2025 /* Single Unix documents select as returning errnos
2026 * EBADF, EINTR, and EINVAL... and in none of those
2027 * cases does it make sense to continue. In fact
2028 * on Linux 2.0.x we seem to end up with EFAULT
2029 * occasionally, and we'd loop forever due to it.
2031 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf, "select: (listen)");
2032 clean_child_exit(1);
2038 /* we remember the last_lr we searched last time around so that
2039 we don't end up starving any particular listening socket */
2040 if (last_lr == NULL) {
2050 ap_get_os_sock(lr->sd, &sockdes);
2051 if (FD_ISSET(sockdes, &main_fds))
2057 while (lr != first_lr);
2058 /* FIXME: if we get here, something bad has happened, and we're
2059 probably gonna spin forever.
2067 /* only one socket, just pretend we did the other stuff */
2068 sd = ap_listeners->sd;
2071 /* if we accept() something we don't want to die, so we have to
2077 /* we didn't get a socket, and we were told to die */
2078 clean_child_exit(0);
2080 clen = sizeof(sa_client);
2081 stat = ap_accept(&csd, sd);
2082 if (stat == APR_SUCCESS || stat != APR_EINTR)
2086 if (stat == APR_SUCCESS)
2087 break; /* We have a socket ready for reading */
2090 /* TODO: this accept result handling stuff should be abstracted...
2091 * it's already out of date between the various unix mpms
2093 /* Our old behaviour here was to continue after accept()
2094 * errors. But this leads us into lots of troubles
2095 * because most of the errors are quite fatal. For
2096 * example, EMFILE can be caused by slow descriptor
2097 * leaks (say in a 3rd party module, or libc). It's
2098 * foolish for us to continue after an EMFILE. We also
2099 * seem to tickle kernel bugs on some platforms which
2100 * lead to never-ending loops here. So it seems best
2101 * to just exit in most cases.
2105 /* EPROTO on certain older kernels really means
2106 * ECONNABORTED, so we need to ignore it for them.
2107 * See discussion in new-httpd archives nh.9701
2108 * search for EPROTO.
2110 * Also see nh.9603, search for EPROTO:
2111 * There is potentially a bug in Solaris 2.x x<6,
2112 * and other boxes that implement tcp sockets in
2113 * userland (i.e. on top of STREAMS). On these
2114 * systems, EPROTO can actually result in a fatal
2115 * loop. See PR#981 for example. It's hard to
2116 * handle both uses of EPROTO.
2123 /* Linux generates the rest of these, other tcp
2124 * stacks (i.e. bsd) tend to hide them behind
2125 * getsockopt() interfaces. They occur when
2126 * the net goes sour or the client disconnects
2127 * after the three-way handshake has been done
2128 * in the kernel but before userland has picked
2147 * When the network layer has been shut down, there
2148 * is not much use in simply exiting: the parent
2149 * would simply re-create us (and we'd fail again).
2150 * Use the CHILDFATAL code to tear the server down.
2151 * @@@ Martin's idea for possible improvement:
2152 * A different approach would be to define
2153 * a new APEXIT_NETDOWN exit code, the reception
2154 * of which would make the parent shutdown all
2155 * children, then idle-loop until it detected that
2156 * the network is up again, and restart the children.
2157 * Ben Hyde noted that temporary ENETDOWN situations
2158 * occur in mobile IP.
2160 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
2161 "accept: giving up.");
2162 clean_child_exit(APEXIT_CHILDFATAL);
2167 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
2168 "offload device inactive");
2169 clean_child_exit(APEXIT_CHILDFATAL);
2172 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, server_conf,
2173 "select/accept error (%u)", errno);
2174 clean_child_exit(APEXIT_CHILDFATAL);
2177 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
2178 "accept: (client socket)");
2179 clean_child_exit(1);
2184 if (ap_graceful_stop_signalled()) {
2185 clean_child_exit(0);
2190 SAFE_ACCEPT(accept_mutex_off()); /* unlock after "accept" */
2193 if (csd == 0) /* 0 is invalid socket for TPF */
2197 /* We've got a socket, let's at least process one request off the
2198 * socket before we accept a graceful restart request. We set
2199 * the signal to ignore because we don't want to disturb any
2202 signal(SIGUSR1, SIG_IGN);
2205 * We now have a connection, so set it up with the appropriate
2206 * socket options, file descriptors, and read/write buffers.
2209 ap_get_os_sock(csd, &sockdes);
2211 clen = sizeof(sa_server);
2212 if (getsockname(sockdes, &sa_server, &clen) < 0) {
2213 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf, "getsockname");
2214 ap_close_socket(csd);
2218 sock_disable_nagle(sockdes);
2220 iol = unix_attach_socket(sockdes);
2222 if (errno == EBADF) {
2223 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, NULL,
2224 "filedescriptor (%u) larger than FD_SETSIZE (%u) "
2225 "found, you probably need to rebuild Apache with a "
2226 "larger FD_SETSIZE", sockdes, FD_SETSIZE);
2229 ap_log_error(APLOG_MARK, APLOG_WARNING, NULL,
2230 "error attaching to socket");
2232 ap_close_socket(csd);
2236 (void) ap_update_child_status(my_child_num, SERVER_BUSY_READ,
2237 (request_rec *) NULL);
2239 conn_io = ap_bcreate(ptrans, B_RDWR);
2241 ap_bpush_iol(conn_io, iol);
2243 current_conn = ap_new_connection(ptrans, server_conf, conn_io,
2244 (struct sockaddr_in *) &sa_client,
2245 (struct sockaddr_in *) &sa_server,
2248 ap_process_connection(current_conn);
2253 static int make_child(server_rec *s, int slot, time_t now)
2257 if (slot + 1 > max_daemons_limit) {
2258 max_daemons_limit = slot + 1;
2262 signal(SIGHUP, just_die);
2263 signal(SIGINT, just_die);
2265 signal(SIGQUIT, SIG_DFL);
2267 signal(SIGTERM, just_die);
2271 (void) ap_update_child_status(slot, SERVER_STARTING, (request_rec *) NULL);
2275 /* BS2000 requires a "special" version of fork() before a setuid() call */
2276 if ((pid = os_fork(unixd_config.user_name)) == -1) {
2278 if ((pid = os_fork(s, slot)) == -1) {
2280 if ((pid = fork()) == -1) {
2282 ap_log_error(APLOG_MARK, APLOG_ERR, s, "fork: Unable to fork new process");
2284 /* fork didn't succeed. Fix the scoreboard or else
2285 * it will say SERVER_STARTING forever and ever
2287 (void) ap_update_child_status(slot, SERVER_DEAD, (request_rec *) NULL);
2289 /* In case system resources are maxxed out, we don't want
2290 Apache running away with the CPU trying to fork over and
2291 over and over again. */
2298 #ifdef AIX_BIND_PROCESSOR
2299 /* by default AIX binds to a single processor
2300 * this bit unbinds children which will then bind to another cpu
2302 #include <sys/processor.h>
2303 int status = bindprocessor(BINDPROCESS, (int)getpid(),
2304 PROCESSOR_CLASS_ANY);
2306 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, server_conf,
2307 "processor unbind failed %d", status);
2310 RAISE_SIGSTOP(MAKE_CHILD);
2311 /* Disable the restart signal handlers and enable the just_die stuff.
2312 * Note that since restart() just notes that a restart has been
2313 * requested there's no race condition here.
2315 signal(SIGHUP, just_die);
2316 signal(SIGUSR1, just_die);
2317 signal(SIGTERM, just_die);
2321 ap_scoreboard_image->parent[slot].pid = pid;
2322 #ifdef SCOREBOARD_FILE
2323 lseek(scoreboard_fd, XtOffsetOf(scoreboard, parent[slot]), 0);
2324 force_write(scoreboard_fd, &ap_scoreboard_image->parent[slot],
2325 sizeof(parent_score));
2332 /* start up a bunch of children */
2333 static void startup_children(int number_to_start)
2336 time_t now = time(0);
2338 for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
2339 if (ap_scoreboard_image->servers[i].status != SERVER_DEAD) {
2342 if (make_child(server_conf, i, now) < 0) {
2351 * idle_spawn_rate is the number of children that will be spawned on the
2352 * next maintenance cycle if there aren't enough idle servers. It is
2353 * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
2354 * without the need to spawn.
2356 static int idle_spawn_rate = 1;
2357 #ifndef MAX_SPAWN_RATE
2358 #define MAX_SPAWN_RATE (32)
2360 static int hold_off_on_exponential_spawning;
2362 static void perform_idle_server_maintenance(void)
2368 time_t now = time(0);
2370 int free_slots[MAX_SPAWN_RATE];
2374 /* initialize the free_list */
2382 ap_sync_scoreboard_image();
2383 for (i = 0; i < ap_daemons_limit; ++i) {
2386 if (i >= max_daemons_limit && free_length == idle_spawn_rate)
2388 ss = &ap_scoreboard_image->servers[i];
2389 status = ss->status;
2390 if (status == SERVER_DEAD) {
2391 /* try to keep children numbers as low as possible */
2392 if (free_length < idle_spawn_rate) {
2393 free_slots[free_length] = i;
2398 /* We consider a starting server as idle because we started it
2399 * at least a cycle ago, and if it still hasn't finished starting
2400 * then we're just going to swamp things worse by forking more.
2401 * So we hopefully won't need to fork more if we count it.
2402 * This depends on the ordering of SERVER_READY and SERVER_STARTING.
2404 if (status <= SERVER_READY) {
2406 /* always kill the highest numbered child if we have to...
2407 * no really well thought out reason ... other than observing
2408 * the server behaviour under linux where lower numbered children
2409 * tend to service more hits (and hence are more likely to have
2410 * their data in cpu caches).
2419 max_daemons_limit = last_non_dead + 1;
2420 if (idle_count > ap_daemons_max_free) {
2421 /* kill off one child... we use SIGUSR1 because that'll cause it to
2422 * shut down gracefully, in case it happened to pick up a request
2423 * while we were counting
2425 kill(ap_scoreboard_image->parent[to_kill].pid, SIGUSR1);
2426 idle_spawn_rate = 1;
2428 else if (idle_count < ap_daemons_min_free) {
2429 /* terminate the free list */
2430 if (free_length == 0) {
2431 /* only report this condition once */
2432 static int reported = 0;
2435 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, server_conf,
2436 "server reached MaxClients setting, consider"
2437 " raising the MaxClients setting");
2440 idle_spawn_rate = 1;
2443 if (idle_spawn_rate >= 8) {
2444 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, server_conf,
2445 "server seems busy, (you may need "
2446 "to increase StartServers, or Min/MaxSpareServers), "
2447 "spawning %d children, there are %d idle, and "
2448 "%d total children", idle_spawn_rate,
2449 idle_count, total_non_dead);
2451 for (i = 0; i < free_length; ++i) {
2453 if(make_child(server_conf, free_slots[i], now) == -1) {
2454 if(free_length == 1) {
2455 shutdown_pending = 1;
2456 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
2457 "No active child processes: shutting down");
2461 make_child(server_conf, free_slots[i], now);
2464 /* the next time around we want to spawn twice as many if this
2465 * wasn't good enough, but not if we've just done a graceful
2467 if (hold_off_on_exponential_spawning) {
2468 --hold_off_on_exponential_spawning;
2470 else if (idle_spawn_rate < MAX_SPAWN_RATE) {
2471 idle_spawn_rate *= 2;
2476 idle_spawn_rate = 1;
2481 static void process_child_status(int pid, ap_wait_t status)
2483 /* Child died... if it died due to a fatal error,
2484 * we should simply bail out.
2486 if ((WIFEXITED(status)) &&
2487 WEXITSTATUS(status) == APEXIT_CHILDFATAL) {
2488 ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_NOERRNO, server_conf,
2489 "Child %d returned a Fatal error... \n"
2490 "Apache is exiting!",
2492 exit(APEXIT_CHILDFATAL);
2494 if (WIFSIGNALED(status)) {
2495 switch (WTERMSIG(status)) {
2504 if (WCOREDUMP(status)) {
2505 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
2507 "child pid %d exit signal %s (%d), "
2508 "possible coredump in %s",
2509 pid, (WTERMSIG(status) >= NumSIG) ? "" :
2510 SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status),
2515 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
2517 "child pid %d exit signal %s (%d)", pid,
2518 SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status));
2523 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
2525 "child pid %d exit signal %d",
2526 pid, WTERMSIG(status));
2533 static int setup_listeners(ap_context_t *p, server_rec *s)
2538 if (ap_listen_open(p, s->port)) {
2539 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, s,
2540 "no listening sockets available, shutting down");
2545 FD_ZERO(&listenfds);
2546 for (lr = ap_listeners; lr; lr = lr->next) {
2547 ap_get_os_sock(lr->sd, &sockdes);
2548 FD_SET(sockdes, &listenfds);
2549 if (sockdes > listenmaxfd) {
2550 listenmaxfd = sockdes;
2557 /*****************************************************************
2558 * Executive routines.
2561 int ap_mpm_run(ap_context_t *_pconf, ap_context_t *plog, server_rec *s)
2563 int remaining_children_to_start;
2569 ap_log_pid(pconf, ap_pid_fname);
2571 if (setup_listeners(pconf, s)) {
2572 /* XXX: hey, what's the right way for the mpm to indicate a fatal error? */
2576 SAFE_ACCEPT(accept_mutex_init(pconf));
2578 reinit_scoreboard(pconf);
2580 #ifdef SCOREBOARD_FILE
2582 ap_scoreboard_fname = ap_server_root_relative(pconf, ap_scoreboard_fname);
2583 ap_note_cleanups_for_fd(pconf, scoreboard_fd);
2589 if (ap_daemons_max_free < ap_daemons_min_free + 1) /* Don't thrash... */
2590 ap_daemons_max_free = ap_daemons_min_free + 1;
2592 /* If we're doing a graceful_restart then we're going to see a lot
2593 * of children exiting immediately when we get into the main loop
2594 * below (because we just sent them SIGUSR1). This happens pretty
2595 * rapidly... and for each one that exits we'll start a new one until
2596 * we reach at least daemons_min_free. But we may be permitted to
2597 * start more than that, so we'll just keep track of how many we're
2598 * supposed to start up without the 1 second penalty between each fork.
2600 remaining_children_to_start = ap_daemons_to_start;
2601 if (remaining_children_to_start > ap_daemons_limit) {
2602 remaining_children_to_start = ap_daemons_limit;
2605 startup_children(remaining_children_to_start);
2606 remaining_children_to_start = 0;
2609 /* give the system some time to recover before kicking into
2610 * exponential mode */
2611 hold_off_on_exponential_spawning = 10;
2614 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
2615 "%s configured -- resuming normal operations",
2616 ap_get_server_version());
2617 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, server_conf,
2618 "Server built: %s", ap_get_server_built());
2619 restart_pending = shutdown_pending = 0;
2621 while (!restart_pending && !shutdown_pending) {
2624 int pid = wait_or_timeout(&status);
2626 /* XXX: if it takes longer than 1 second for all our children
2627 * to start up and get into IDLE state then we may spawn an
2631 process_child_status(pid, status);
2632 /* non-fatal death... note that it's gone in the scoreboard. */
2633 ap_sync_scoreboard_image();
2634 child_slot = find_child_by_pid(pid);
2635 if (child_slot >= 0) {
2636 (void) ap_update_child_status(child_slot, SERVER_DEAD,
2637 (request_rec *) NULL);
2638 if (remaining_children_to_start
2639 && child_slot < ap_daemons_limit) {
2640 /* we're still doing a 1-for-1 replacement of dead
2641 * children with new children
2643 make_child(server_conf, child_slot, time(0));
2644 --remaining_children_to_start;
2646 #ifdef HAS_OTHER_CHILD
2648 else if (reap_other_child(pid, status) == 0) {
2652 else if (is_graceful) {
2653 /* Great, we've probably just lost a slot in the
2654 * scoreboard. Somehow we don't know about this
2657 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, server_conf,
2658 "long lost child came home! (pid %d)", pid);
2660 /* Don't perform idle maintenance when a child dies,
2661 * only do it when there's a timeout. Remember only a
2662 * finite number of children can die, and it's pretty
2663 * pathological for a lot to die suddenly.
2667 else if (remaining_children_to_start) {
2668 /* we hit a 1 second timeout in which none of the previous
2669 * generation of children needed to be reaped... so assume
2670 * they're all done, and pick up the slack if any is left.
2672 startup_children(remaining_children_to_start);
2673 remaining_children_to_start = 0;
2674 /* In any event we really shouldn't do the code below because
2675 * few of the servers we just started are in the IDLE state
2676 * yet, so we'd mistakenly create an extra server.
2681 perform_idle_server_maintenance();
2683 shutdown_pending = os_check_server(tpf_server_name);
2689 if (shutdown_pending) {
2690 /* Time to gracefully shut down:
2691 * Kill child processes, tell them to call child_exit, etc...
2693 if (ap_killpg(getpgrp(), SIGTERM) < 0) {
2694 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "killpg SIGTERM");
2696 reclaim_child_processes(1); /* Start with SIGTERM */
2698 /* cleanup pid file on normal shutdown */
2700 const char *pidfile = NULL;
2701 pidfile = ap_server_root_relative (pconf, ap_pid_fname);
2702 if ( pidfile != NULL && unlink(pidfile) == 0)
2703 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO,
2705 "removed PID file %s (pid=%ld)",
2706 pidfile, (long)getpid());
2709 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
2710 "caught SIGTERM, shutting down");
2714 /* we've been told to restart */
2715 signal(SIGHUP, SIG_IGN);
2716 signal(SIGUSR1, SIG_IGN);
2719 /* not worth thinking about */
2723 /* advance to the next generation */
2724 /* XXX: we really need to make sure this new generation number isn't in
2725 * use by any of the children.
2728 ap_scoreboard_image->global.running_generation = ap_my_generation;
2729 update_scoreboard_global();
2732 #ifndef SCOREBOARD_FILE
2735 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
2736 "SIGUSR1 received. Doing graceful restart");
2738 /* kill off the idle ones */
2739 if (ap_killpg(getpgrp(), SIGUSR1) < 0) {
2740 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "killpg SIGUSR1");
2742 #ifndef SCOREBOARD_FILE
2743 /* This is mostly for debugging... so that we know what is still
2744 * gracefully dealing with existing request. But we can't really
2745 * do it if we're in a SCOREBOARD_FILE because it'll cause
2746 * corruption too easily.
2748 ap_sync_scoreboard_image();
2749 for (i = 0; i < ap_daemons_limit; ++i) {
2750 if (ap_scoreboard_image->servers[i].status != SERVER_DEAD) {
2751 ap_scoreboard_image->servers[i].status = SERVER_GRACEFUL;
2758 if (ap_killpg(getpgrp(), SIGHUP) < 0) {
2759 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "killpg SIGHUP");
2761 reclaim_child_processes(0); /* Not when just starting up */
2762 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
2763 "SIGHUP received. Attempting to restart");
2767 ap_restart_time = time(NULL);
2773 static void prefork_pre_config(ap_context_t *p, ap_context_t *plog, ap_context_t *ptemp)
2775 static int restart_num = 0;
2777 one_process = !!getenv("ONE_PROCESS");
2779 /* sigh, want this only the second time around */
2780 if (restart_num++ == 1) {
2791 ap_listen_pre_config();
2792 ap_daemons_to_start = DEFAULT_START_DAEMON;
2793 ap_daemons_min_free = DEFAULT_MIN_FREE_DAEMON;
2794 ap_daemons_max_free = DEFAULT_MAX_FREE_DAEMON;
2795 ap_daemons_limit = HARD_SERVER_LIMIT;
2796 ap_pid_fname = DEFAULT_PIDLOG;
2797 ap_scoreboard_fname = DEFAULT_SCOREBOARD;
2798 ap_lock_fname = DEFAULT_LOCKFILE;
2799 ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
2800 ap_extended_status = 0;
2802 ap_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
2805 static void prefork_hooks(void)
2807 ap_hook_pre_config(prefork_pre_config,NULL,NULL,HOOK_MIDDLE);
2812 /* TODO: set one_process properly */ one_process = 0;
2815 static const char *set_pidfile(cmd_parms *cmd, void *dummy, char *arg)
2817 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2822 if (cmd->server->is_virtual) {
2823 return "PidFile directive not allowed in <VirtualHost>";
2829 static const char *set_scoreboard(cmd_parms *cmd, void *dummy, char *arg)
2831 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2836 ap_scoreboard_fname = arg;
2840 static const char *set_lockfile(cmd_parms *cmd, void *dummy, char *arg)
2842 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2847 ap_lock_fname = arg;
2851 static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy, char *arg)
2853 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2858 ap_daemons_to_start = atoi(arg);
2862 static const char *set_min_free_servers(cmd_parms *cmd, void *dummy, char *arg)
2864 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2869 ap_daemons_min_free = atoi(arg);
2870 if (ap_daemons_min_free <= 0) {
2871 fprintf(stderr, "WARNING: detected MinSpareServers set to non-positive.\n");
2872 fprintf(stderr, "Resetting to 1 to avoid almost certain Apache failure.\n");
2873 fprintf(stderr, "Please read the documentation.\n");
2874 ap_daemons_min_free = 1;
2880 static const char *set_max_free_servers(cmd_parms *cmd, void *dummy, char *arg)
2882 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2887 ap_daemons_max_free = atoi(arg);
2891 static const char *set_server_limit (cmd_parms *cmd, void *dummy, char *arg)
2893 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2898 ap_daemons_limit = atoi(arg);
2899 if (ap_daemons_limit > HARD_SERVER_LIMIT) {
2900 fprintf(stderr, "WARNING: MaxClients of %d exceeds compile time limit "
2901 "of %d servers,\n", ap_daemons_limit, HARD_SERVER_LIMIT);
2902 fprintf(stderr, " lowering MaxClients to %d. To increase, please "
2903 "see the\n", HARD_SERVER_LIMIT);
2904 fprintf(stderr, " HARD_SERVER_LIMIT define in src/include/httpd.h.\n");
2905 ap_daemons_limit = HARD_SERVER_LIMIT;
2907 else if (ap_daemons_limit < 1) {
2908 fprintf(stderr, "WARNING: Require MaxClients > 0, setting to 1\n");
2909 ap_daemons_limit = 1;
2914 static const char *set_max_requests(cmd_parms *cmd, void *dummy, char *arg)
2916 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2921 ap_max_requests_per_child = atoi(arg);
2926 static const char *set_coredumpdir (cmd_parms *cmd, void *dummy, char *arg)
2930 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2935 fname = ap_server_root_relative(cmd->pool, arg);
2936 /* ZZZ change this to the AP func FileInfo*/
2937 if ((stat(fname, &finfo) == -1) || !S_ISDIR(finfo.st_mode)) {
2938 return ap_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
2939 " does not exist or is not a directory", NULL);
2941 ap_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir));
2945 /* there are no threads in the prefork model, so the mutexes are
2947 /* TODO: make these #defines to eliminate the function call */
2949 struct ap_thread_mutex {
2953 API_EXPORT(ap_thread_mutex *) ap_thread_mutex_new(void)
2955 return malloc(sizeof(ap_thread_mutex));
2958 API_EXPORT(void) ap_thread_mutex_lock(ap_thread_mutex *mtx)
2962 API_EXPORT(void) ap_thread_mutex_unlock(ap_thread_mutex *mtx)
2966 API_EXPORT(void) ap_thread_mutex_destroy(ap_thread_mutex *mtx)
2972 static const command_rec prefork_cmds[] = {
2973 UNIX_DAEMON_COMMANDS
2975 { "PidFile", set_pidfile, NULL, RSRC_CONF, TAKE1,
2976 "A file for logging the server process ID"},
2977 { "ScoreBoardFile", set_scoreboard, NULL, RSRC_CONF, TAKE1,
2978 "A file for Apache to maintain runtime process management information"},
2979 { "LockFile", set_lockfile, NULL, RSRC_CONF, TAKE1,
2980 "The lockfile used when Apache needs to lock the accept() call"},
2981 { "StartServers", set_daemons_to_start, NULL, RSRC_CONF, TAKE1,
2982 "Number of child processes launched at server startup" },
2983 { "MinSpareServers", set_min_free_servers, NULL, RSRC_CONF, TAKE1,
2984 "Minimum number of idle children, to handle request spikes" },
2985 { "MaxSpareServers", set_max_free_servers, NULL, RSRC_CONF, TAKE1,
2986 "Maximum number of idle children" },
2987 { "MaxClients", set_server_limit, NULL, RSRC_CONF, TAKE1,
2988 "Maximum number of children alive at the same time" },
2989 { "MaxRequestsPerChild", set_max_requests, NULL, RSRC_CONF, TAKE1,
2990 "Maximum number of requests a particular child serves before dying." },
2991 { "CoreDumpDirectory", set_coredumpdir, NULL, RSRC_CONF, TAKE1,
2992 "The location of the directory Apache changes to before dumping core" },
2996 module MODULE_VAR_EXPORT mpm_prefork_module = {
2997 STANDARD20_MODULE_STUFF,
2998 NULL, /* create per-directory config structure */
2999 NULL, /* merge per-directory config structures */
3000 NULL, /* create per-server config structure */
3001 NULL, /* merge per-server config structures */
3002 prefork_cmds, /* command ap_table_t */
3003 NULL, /* handlers */
3004 prefork_hooks, /* register hooks */