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/)."
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26 * 5. Products derived from this software may not be called "Apache"
27 * nor may "Apache" appear in their names without prior written
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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
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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
91 #include "mpm_default.h"
92 #include "http_main.h"
94 #include "http_config.h"
95 #include "http_core.h" /* for get_remote_host */
96 #include "http_connection.h"
97 #include "scoreboard.h"
100 #include "iol_socket.h"
101 #include "ap_listen.h"
102 #ifdef USE_SHMGET_SCOREBOARD
103 #include <sys/types.h>
108 #ifdef HAVE_BSTRING_H
109 #include <bstring.h> /* for IRIX, FD_SET calls bzero() */
114 static int ap_max_requests_per_child=0;
115 static char *ap_pid_fname=NULL;
116 static char *ap_scoreboard_fname=NULL;
117 static char *ap_lock_fname;
118 static char *ap_server_argv0=NULL;
119 static int ap_daemons_to_start=0;
120 static int ap_daemons_min_free=0;
121 static int ap_daemons_max_free=0;
122 static int ap_daemons_limit=0;
123 static time_t ap_restart_time=0;
124 static int ap_extended_status = 0;
127 * The max child slot ever assigned, preserved across restarts. Necessary
128 * to deal with MaxClients changes across SIGUSR1 restarts. We use this
129 * value to optimize routines that have to scan the entire scoreboard.
131 static int max_daemons_limit = -1;
133 static char ap_coredump_dir[MAX_STRING_LEN];
135 /* *Non*-shared http_main globals... */
137 static server_rec *server_conf;
139 static fd_set listenfds;
140 static int listenmaxfd;
142 /* one_process --- debugging mode variable; can be set from the command line
143 * with the -X flag. If set, this gets you the child_main loop running
144 * in the process which originally started up (no detach, no make_child),
145 * which is a pretty nice debugging environment. (You'll get a SIGHUP
146 * early in standalone_main; just continue through. This is the server
147 * trying to kill off any child processes which it might have lying
148 * around --- Apache doesn't keep track of their pids, it just sends
149 * SIGHUP to the process group, ignoring it in the root process.
150 * Continue through and you'll be fine.).
153 static int one_process = 0;
155 #ifdef HAS_OTHER_CHILD
156 /* used to maintain list of children which aren't part of the scoreboard */
157 typedef struct other_child_rec other_child_rec;
158 struct other_child_rec {
159 other_child_rec *next;
161 void (*maintenance) (int, void *, ap_wait_t);
165 static other_child_rec *other_children;
168 static pool *pconf; /* Pool for config stuff */
169 static pool *pchild; /* Pool for httpd child stuff */
171 static int my_pid; /* it seems silly to call getpid all the time */
173 static int my_child_num;
178 char tpf_server_name[INETD_SERVNAME_LENGTH+1];
181 static scoreboard *ap_scoreboard_image = NULL;
185 * change directory for gprof to plop the gmon.out file
186 * configure in httpd.conf:
187 * GprofDir logs/ -> $ServerRoot/logs/gmon.out
188 * GprofDir logs/% -> $ServerRoot/logs/gprof.$pid/gmon.out
190 static void chdir_for_gprof(void)
192 core_server_config *sconf =
193 ap_get_module_config(server_conf->module_config, &core_module);
194 char *dir = sconf->gprof_dir;
198 int len = strlen(sconf->gprof_dir) - 1;
199 if(*(dir + len) == '%') {
201 ap_snprintf(buf, sizeof(buf), "%sgprof.%d", dir, (int)getpid());
203 dir = ap_server_root_relative(pconf, buf[0] ? buf : dir);
204 if(mkdir(dir, 0755) < 0 && errno != EEXIST) {
205 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
206 "gprof: error creating directory %s", dir);
210 dir = ap_server_root_relative(pconf, "logs");
216 #define chdir_for_gprof()
219 /* a clean exit from a child with proper cleanup */
220 static void clean_child_exit(int code) __attribute__ ((noreturn));
221 static void clean_child_exit(int code)
224 ap_destroy_pool(pchild);
230 #if defined(USE_FCNTL_SERIALIZED_ACCEPT) || defined(USE_FLOCK_SERIALIZED_ACCEPT)
231 static void expand_lock_fname(pool *p)
233 /* XXXX possibly bogus cast */
234 ap_lock_fname = ap_psprintf(p, "%s.%lu",
235 ap_server_root_relative(p, ap_lock_fname), (unsigned long)getpid());
239 #if defined (USE_USLOCK_SERIALIZED_ACCEPT)
243 static ulock_t uslock = NULL;
245 #define accept_mutex_child_init(x)
247 static void accept_mutex_init(pool *p)
253 /* default is 8, allocate enough for all the children plus the parent */
254 if ((old = usconfig(CONF_INITUSERS, HARD_SERVER_LIMIT + 1)) == -1) {
255 perror("usconfig(CONF_INITUSERS)");
259 if ((old = usconfig(CONF_LOCKTYPE, US_NODEBUG)) == -1) {
260 perror("usconfig(CONF_LOCKTYPE)");
263 if ((old = usconfig(CONF_ARENATYPE, US_SHAREDONLY)) == -1) {
264 perror("usconfig(CONF_ARENATYPE)");
267 if ((us = usinit("/dev/zero")) == NULL) {
272 if ((uslock = usnewlock(us)) == NULL) {
278 static void accept_mutex_on(void)
280 switch (ussetlock(uslock)) {
285 fprintf(stderr, "didn't get lock\n");
286 clean_child_exit(APEXIT_CHILDFATAL);
289 clean_child_exit(APEXIT_CHILDFATAL);
293 static void accept_mutex_off(void)
295 if (usunsetlock(uslock) == -1) {
296 perror("usunsetlock");
297 clean_child_exit(APEXIT_CHILDFATAL);
301 #elif defined (USE_PTHREAD_SERIALIZED_ACCEPT)
303 /* This code probably only works on Solaris ... but it works really fast
304 * on Solaris. Note that pthread mutexes are *NOT* released when a task
305 * dies ... the task has to free it itself. So we block signals and
306 * try to be nice about releasing the mutex.
311 static pthread_mutex_t *accept_mutex = (void *)(caddr_t) -1;
312 static int have_accept_mutex;
313 static sigset_t accept_block_mask;
314 static sigset_t accept_previous_mask;
316 static void accept_mutex_child_cleanup(void *foo)
318 if (accept_mutex != (void *)(caddr_t)-1
319 && have_accept_mutex) {
320 pthread_mutex_unlock(accept_mutex);
324 static void accept_mutex_child_init(pool *p)
326 ap_register_cleanup(p, NULL, accept_mutex_child_cleanup, ap_null_cleanup);
329 static void accept_mutex_cleanup(void *foo)
331 if (accept_mutex != (void *)(caddr_t)-1
332 && munmap((caddr_t) accept_mutex, sizeof(*accept_mutex))) {
335 accept_mutex = (void *)(caddr_t)-1;
338 static void accept_mutex_init(pool *p)
340 pthread_mutexattr_t mattr;
343 fd = open("/dev/zero", O_RDWR);
345 perror("open(/dev/zero)");
348 accept_mutex = (pthread_mutex_t *) mmap((caddr_t) 0, sizeof(*accept_mutex),
349 PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
350 if (accept_mutex == (void *) (caddr_t) - 1) {
355 if ((errno = pthread_mutexattr_init(&mattr))) {
356 perror("pthread_mutexattr_init");
359 if ((errno = pthread_mutexattr_setpshared(&mattr,
360 PTHREAD_PROCESS_SHARED))) {
361 perror("pthread_mutexattr_setpshared");
364 if ((errno = pthread_mutex_init(accept_mutex, &mattr))) {
365 perror("pthread_mutex_init");
368 sigfillset(&accept_block_mask);
369 sigdelset(&accept_block_mask, SIGHUP);
370 sigdelset(&accept_block_mask, SIGTERM);
371 sigdelset(&accept_block_mask, SIGUSR1);
372 ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
375 static void accept_mutex_on(void)
379 if (sigprocmask(SIG_BLOCK, &accept_block_mask, &accept_previous_mask)) {
380 perror("sigprocmask(SIG_BLOCK)");
381 clean_child_exit(APEXIT_CHILDFATAL);
383 if ((err = pthread_mutex_lock(accept_mutex))) {
385 perror("pthread_mutex_lock");
386 clean_child_exit(APEXIT_CHILDFATAL);
388 have_accept_mutex = 1;
391 static void accept_mutex_off(void)
395 if ((err = pthread_mutex_unlock(accept_mutex))) {
397 perror("pthread_mutex_unlock");
398 clean_child_exit(APEXIT_CHILDFATAL);
400 /* There is a slight race condition right here... if we were to die right
401 * now, we'd do another pthread_mutex_unlock. Now, doing that would let
402 * another process into the mutex. pthread mutexes are designed to be
403 * fast, as such they don't have protection for things like testing if the
404 * thread owning a mutex is actually unlocking it (or even any way of
405 * testing who owns the mutex).
407 * If we were to unset have_accept_mutex prior to releasing the mutex
408 * then the race could result in the server unable to serve hits. Doing
409 * it this way means that the server can continue, but an additional
410 * child might be in the critical section ... at least it's still serving
413 have_accept_mutex = 0;
414 if (sigprocmask(SIG_SETMASK, &accept_previous_mask, NULL)) {
415 perror("sigprocmask(SIG_SETMASK)");
420 #elif defined (USE_SYSVSEM_SERIALIZED_ACCEPT)
422 #include <sys/types.h>
426 #ifdef NEED_UNION_SEMUN
427 /* it makes no sense, but this isn't defined on solaris */
430 struct semid_ds *buf;
436 static int sem_id = -1;
437 static struct sembuf op_on;
438 static struct sembuf op_off;
440 /* We get a random semaphore ... the lame sysv semaphore interface
441 * means we have to be sure to clean this up or else we'll leak
444 static void accept_mutex_cleanup(void *foo)
450 /* this is ignored anyhow */
452 semctl(sem_id, 0, IPC_RMID, ick);
455 #define accept_mutex_child_init(x)
457 static void accept_mutex_init(pool *p)
462 /* acquire the semaphore */
463 sem_id = semget(IPC_PRIVATE, 1, IPC_CREAT | 0600);
469 if (semctl(sem_id, 0, SETVAL, ick) < 0) {
470 perror("semctl(SETVAL)");
474 /* restrict it to use only by the appropriate user_id ... not that this
475 * stops CGIs from acquiring it and dinking around with it.
477 buf.sem_perm.uid = unixd_config.user_id;
478 buf.sem_perm.gid = unixd_config.group_id;
479 buf.sem_perm.mode = 0600;
481 if (semctl(sem_id, 0, IPC_SET, ick) < 0) {
482 perror("semctl(IPC_SET)");
486 ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
488 /* pre-initialize these */
491 op_on.sem_flg = SEM_UNDO;
494 op_off.sem_flg = SEM_UNDO;
497 static void accept_mutex_on(void)
499 while (semop(sem_id, &op_on, 1) < 0) {
500 if (errno != EINTR) {
501 perror("accept_mutex_on");
502 clean_child_exit(APEXIT_CHILDFATAL);
507 static void accept_mutex_off(void)
509 while (semop(sem_id, &op_off, 1) < 0) {
510 if (errno != EINTR) {
511 perror("accept_mutex_off");
512 clean_child_exit(APEXIT_CHILDFATAL);
517 #elif defined(USE_FCNTL_SERIALIZED_ACCEPT)
518 static struct flock lock_it;
519 static struct flock unlock_it;
521 static int lock_fd = -1;
523 #define accept_mutex_child_init(x)
526 * Initialize mutex lock.
527 * Must be safe to call this on a restart.
529 static void accept_mutex_init(pool *p)
532 lock_it.l_whence = SEEK_SET; /* from current point */
533 lock_it.l_start = 0; /* -"- */
534 lock_it.l_len = 0; /* until end of file */
535 lock_it.l_type = F_WRLCK; /* set exclusive/write lock */
536 lock_it.l_pid = 0; /* pid not actually interesting */
537 unlock_it.l_whence = SEEK_SET; /* from current point */
538 unlock_it.l_start = 0; /* -"- */
539 unlock_it.l_len = 0; /* until end of file */
540 unlock_it.l_type = F_UNLCK; /* set exclusive/write lock */
541 unlock_it.l_pid = 0; /* pid not actually interesting */
543 expand_lock_fname(p);
544 lock_fd = ap_popenf(p, ap_lock_fname, O_CREAT | O_WRONLY | O_EXCL, 0644);
547 fprintf(stderr, "Cannot open lock file: %s\n", ap_lock_fname);
550 unlink(ap_lock_fname);
553 static void accept_mutex_on(void)
557 while ((ret = fcntl(lock_fd, F_SETLKW, &lock_it)) < 0 && errno == EINTR) {
562 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
563 "fcntl: F_SETLKW: Error getting accept lock, exiting! "
564 "Perhaps you need to use the LockFile directive to place "
565 "your lock file on a local disk!");
566 clean_child_exit(APEXIT_CHILDFATAL);
570 static void accept_mutex_off(void)
574 while ((ret = fcntl(lock_fd, F_SETLKW, &unlock_it)) < 0 && errno == EINTR) {
578 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
579 "fcntl: F_SETLKW: Error freeing accept lock, exiting! "
580 "Perhaps you need to use the LockFile directive to place "
581 "your lock file on a local disk!");
582 clean_child_exit(APEXIT_CHILDFATAL);
586 #elif defined(USE_FLOCK_SERIALIZED_ACCEPT)
588 static int lock_fd = -1;
590 static void accept_mutex_cleanup(void *foo)
592 unlink(ap_lock_fname);
596 * Initialize mutex lock.
597 * Done by each child at it's birth
599 static void accept_mutex_child_init(pool *p)
602 lock_fd = ap_popenf(p, ap_lock_fname, O_WRONLY, 0600);
604 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
605 "Child cannot open lock file: %s", ap_lock_fname);
606 clean_child_exit(APEXIT_CHILDINIT);
611 * Initialize mutex lock.
612 * Must be safe to call this on a restart.
614 static void accept_mutex_init(pool *p)
616 expand_lock_fname(p);
617 unlink(ap_lock_fname);
618 lock_fd = ap_popenf(p, ap_lock_fname, O_CREAT | O_WRONLY | O_EXCL, 0600);
620 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
621 "Parent cannot open lock file: %s", ap_lock_fname);
624 ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
627 static void accept_mutex_on(void)
631 while ((ret = flock(lock_fd, LOCK_EX)) < 0 && errno == EINTR)
635 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
636 "flock: LOCK_EX: Error getting accept lock. Exiting!");
637 clean_child_exit(APEXIT_CHILDFATAL);
641 static void accept_mutex_off(void)
643 if (flock(lock_fd, LOCK_UN) < 0) {
644 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
645 "flock: LOCK_UN: Error freeing accept lock. Exiting!");
646 clean_child_exit(APEXIT_CHILDFATAL);
650 #elif defined(USE_OS2SEM_SERIALIZED_ACCEPT)
652 static HMTX lock_sem = -1;
654 static void accept_mutex_cleanup(void *foo)
656 DosReleaseMutexSem(lock_sem);
657 DosCloseMutexSem(lock_sem);
661 * Initialize mutex lock.
662 * Done by each child at it's birth
664 static void accept_mutex_child_init(pool *p)
666 int rc = DosOpenMutexSem(NULL, &lock_sem);
669 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
670 "Child cannot open lock semaphore, rc=%d", rc);
671 clean_child_exit(APEXIT_CHILDINIT);
673 ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
678 * Initialize mutex lock.
679 * Must be safe to call this on a restart.
681 static void accept_mutex_init(pool *p)
683 int rc = DosCreateMutexSem(NULL, &lock_sem, DC_SEM_SHARED, FALSE);
686 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
687 "Parent cannot create lock semaphore, rc=%d", rc);
691 ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
694 static void accept_mutex_on(void)
696 int rc = DosRequestMutexSem(lock_sem, SEM_INDEFINITE_WAIT);
699 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
700 "OS2SEM: Error %d getting accept lock. Exiting!", rc);
701 clean_child_exit(APEXIT_CHILDFATAL);
705 static void accept_mutex_off(void)
707 int rc = DosReleaseMutexSem(lock_sem);
710 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
711 "OS2SEM: Error %d freeing accept lock. Exiting!", rc);
712 clean_child_exit(APEXIT_CHILDFATAL);
716 #elif defined(USE_TPF_CORE_SERIALIZED_ACCEPT)
718 static int tpf_core_held;
720 static void accept_mutex_cleanup(void *foo)
726 #define accept_mutex_init(x)
728 static void accept_mutex_child_init(pool *p)
730 ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
734 static void accept_mutex_on(void)
741 static void accept_mutex_off(void)
749 /* Default --- no serialization. Other methods *could* go here,
752 #if !defined(MULTITHREAD)
753 /* Multithreaded systems don't complete between processes for
755 #define NO_SERIALIZED_ACCEPT
756 #define accept_mutex_child_init(x)
757 #define accept_mutex_init(x)
758 #define accept_mutex_on()
759 #define accept_mutex_off()
763 /* On some architectures it's safe to do unserialized accept()s in the single
764 * Listen case. But it's never safe to do it in the case where there's
765 * multiple Listen statements. Define SINGLE_LISTEN_UNSERIALIZED_ACCEPT
766 * when it's safe in the single Listen case.
768 #ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
769 #define SAFE_ACCEPT(stmt) do {if (ap_listeners->next) {stmt;}} while(0)
771 #define SAFE_ACCEPT(stmt) do {stmt;} while(0)
775 /*****************************************************************
776 * dealing with other children
779 #ifdef HAS_OTHER_CHILD
780 API_EXPORT(void) ap_register_other_child(int pid,
781 void (*maintenance) (int reason, void *, ap_wait_t status),
782 void *data, int write_fd)
784 other_child_rec *ocr;
786 ocr = ap_palloc(pconf, sizeof(*ocr));
788 ocr->maintenance = maintenance;
790 ocr->write_fd = write_fd;
791 ocr->next = other_children;
792 other_children = ocr;
795 /* note that since this can be called by a maintenance function while we're
796 * scanning the other_children list, all scanners should protect themself
797 * by loading ocr->next before calling any maintenance function.
799 API_EXPORT(void) ap_unregister_other_child(void *data)
801 other_child_rec **pocr, *nocr;
803 for (pocr = &other_children; *pocr; pocr = &(*pocr)->next) {
804 if ((*pocr)->data == data) {
805 nocr = (*pocr)->next;
806 (*(*pocr)->maintenance) (OC_REASON_UNREGISTER, (*pocr)->data, -1);
808 /* XXX: um, well we've just wasted some space in pconf ? */
814 /* test to ensure that the write_fds are all still writable, otherwise
815 * invoke the maintenance functions as appropriate */
816 static void probe_writable_fds(void)
820 other_child_rec *ocr, *nocr;
824 if (other_children == NULL)
828 FD_ZERO(&writable_fds);
830 for (ocr = other_children; ocr; ocr = ocr->next) {
831 if (ocr->write_fd == -1)
833 FD_SET(ocr->write_fd, &writable_fds);
834 if (ocr->write_fd > fd_max) {
835 fd_max = ocr->write_fd;
843 rc = ap_select(fd_max + 1, NULL, &writable_fds, NULL, &tv);
844 } while (rc == -1 && errno == EINTR);
847 /* XXX: uhh this could be really bad, we could have a bad file
848 * descriptor due to a bug in one of the maintenance routines */
849 ap_log_unixerr("probe_writable_fds", "select",
850 "could not probe writable fds", server_conf);
856 for (ocr = other_children; ocr; ocr = nocr) {
858 if (ocr->write_fd == -1)
860 if (FD_ISSET(ocr->write_fd, &writable_fds))
862 (*ocr->maintenance) (OC_REASON_UNWRITABLE, ocr->data, -1);
866 /* possibly reap an other_child, return 0 if yes, -1 if not */
867 static int reap_other_child(int pid, ap_wait_t status)
869 other_child_rec *ocr, *nocr;
871 for (ocr = other_children; ocr; ocr = nocr) {
876 (*ocr->maintenance) (OC_REASON_DEATH, ocr->data, status);
883 /*****************************************************************
885 * Dealing with the scoreboard... a lot of these variables are global
886 * only to avoid getting clobbered by the longjmp() that happens when
887 * a hard timeout expires...
889 * We begin with routines which deal with the file itself...
892 #if defined(USE_OS2_SCOREBOARD)
894 /* The next two routines are used to access shared memory under OS/2. */
895 /* This requires EMX v09c to be installed. */
897 caddr_t create_shared_heap(const char *name, size_t size)
903 rc = DosAllocSharedMem(&mem, name, size,
904 PAG_COMMIT | PAG_READ | PAG_WRITE);
907 h = _ucreate(mem, size, !_BLOCK_CLEAN, _HEAP_REGULAR | _HEAP_SHARED,
914 caddr_t get_shared_heap(const char *Name)
917 PVOID BaseAddress; /* Pointer to the base address of
918 the shared memory object */
919 ULONG AttributeFlags; /* Flags describing characteristics
920 of the shared memory object */
921 APIRET rc; /* Return code */
923 /* Request read and write access to */
924 /* the shared memory object */
925 AttributeFlags = PAG_WRITE | PAG_READ;
927 rc = DosGetNamedSharedMem(&BaseAddress, Name, AttributeFlags);
930 printf("DosGetNamedSharedMem error: return code = %ld", rc);
937 static void setup_shared_mem(pool *p)
943 m = (caddr_t) create_shared_heap("\\SHAREMEM\\SCOREBOARD", SCOREBOARD_SIZE);
945 fprintf(stderr, "%s: Could not create OS/2 Shared memory pool.\n",
950 rc = _uopen((Heap_t) m);
953 "%s: Could not uopen() newly created OS/2 Shared memory pool.\n",
956 ap_scoreboard_image = (scoreboard *) m;
957 ap_scoreboard_image->global.running_generation = 0;
960 static void reopen_scoreboard(pool *p)
965 m = (caddr_t) get_shared_heap("\\SHAREMEM\\SCOREBOARD");
967 fprintf(stderr, "%s: Could not find existing OS/2 Shared memory pool.\n",
972 rc = _uopen((Heap_t) m);
973 ap_scoreboard_image = (scoreboard *) m;
976 #elif defined(USE_POSIX_SCOREBOARD)
977 #include <sys/mman.h>
982 * As of version 4.23A, shared memory in QNX must reside under /dev/shmem,
983 * where no subdirectories allowed.
985 * POSIX shm_open() and shm_unlink() will take care about this issue,
986 * but to avoid confusion, I suggest to redefine scoreboard file name
987 * in httpd.conf to cut "logs/" from it. With default setup actual name
988 * will be "/dev/shmem/logs.apache_status".
990 * If something went wrong and Apache did not unlinked this object upon
991 * exit, you can remove it manually, using "rm -f" command.
994 * <sys/mman.h> in QNX defines MAP_ANON, but current implementation
995 * does NOT support BSD style anonymous mapping. So, the order of
996 * conditional compilation is important:
997 * this #ifdef section must be ABOVE the next one (BSD style).
999 * I tested this stuff and it works fine for me, but if it provides
1000 * trouble for you, just comment out USE_MMAP_SCOREBOARD in QNX section
1004 * Igor N. Kovalenko -- infoh@mail.wplus.net
1007 static void cleanup_shared_mem(void *d)
1009 shm_unlink(ap_scoreboard_fname);
1012 static void setup_shared_mem(pool *p)
1018 fd = shm_open(ap_scoreboard_fname, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
1020 ap_snprintf(buf, sizeof(buf), "%s: could not open(create) scoreboard",
1025 if (ltrunc(fd, (off_t) SCOREBOARD_SIZE, SEEK_SET) == -1) {
1026 ap_snprintf(buf, sizeof(buf), "%s: could not ltrunc scoreboard",
1029 shm_unlink(ap_scoreboard_fname);
1032 if ((m = (caddr_t) mmap((caddr_t) 0,
1033 (size_t) SCOREBOARD_SIZE, PROT_READ | PROT_WRITE,
1034 MAP_SHARED, fd, (off_t) 0)) == (caddr_t) - 1) {
1035 ap_snprintf(buf, sizeof(buf), "%s: cannot mmap scoreboard",
1038 shm_unlink(ap_scoreboard_fname);
1042 ap_register_cleanup(p, NULL, cleanup_shared_mem, ap_null_cleanup);
1043 ap_scoreboard_image = (scoreboard *) m;
1044 ap_scoreboard_image->global.running_generation = 0;
1047 static void reopen_scoreboard(pool *p)
1051 #elif defined(USE_MMAP_SCOREBOARD)
1053 static void setup_shared_mem(pool *p)
1057 #if defined(MAP_ANON)
1061 * 9-Aug-97 - Jeff Venters (venters@convex.hp.com)
1062 * ConvexOS maps address space as follows:
1063 * 0x00000000 - 0x7fffffff : Kernel
1064 * 0x80000000 - 0xffffffff : User
1065 * Start mmapped area 1GB above start of text.
1067 * Also, the length requires a pointer as the actual length is
1068 * returned (rounded up to a page boundary).
1071 unsigned len = SCOREBOARD_SIZE;
1073 m = mmap((caddr_t) 0xC0000000, &len,
1074 PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, NOFD, 0);
1076 #elif defined(MAP_TMPFILE)
1078 char mfile[] = "/tmp/apache_shmem_XXXX";
1079 int fd = mkstemp(mfile);
1082 fprintf(stderr, "%s: Could not open %s\n", ap_server_argv0, mfile);
1085 m = mmap((caddr_t) 0, SCOREBOARD_SIZE,
1086 PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
1087 if (m == (caddr_t) - 1) {
1089 fprintf(stderr, "%s: Could not mmap %s\n", ap_server_argv0, mfile);
1096 m = mmap((caddr_t) 0, SCOREBOARD_SIZE,
1097 PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0);
1099 if (m == (caddr_t) - 1) {
1101 fprintf(stderr, "%s: Could not mmap memory\n", ap_server_argv0);
1108 fd = open("/dev/zero", O_RDWR);
1111 fprintf(stderr, "%s: Could not open /dev/zero\n", ap_server_argv0);
1114 m = mmap((caddr_t) 0, SCOREBOARD_SIZE,
1115 PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
1116 if (m == (caddr_t) - 1) {
1118 fprintf(stderr, "%s: Could not mmap /dev/zero\n", ap_server_argv0);
1123 ap_scoreboard_image = (scoreboard *) m;
1124 ap_scoreboard_image->global.running_generation = 0;
1127 static void reopen_scoreboard(pool *p)
1131 #elif defined(USE_SHMGET_SCOREBOARD)
1132 static key_t shmkey = IPC_PRIVATE;
1133 static int shmid = -1;
1135 static void setup_shared_mem(pool *p)
1137 struct shmid_ds shmbuf;
1142 if ((shmid = shmget(shmkey, SCOREBOARD_SIZE, IPC_CREAT | SHM_R | SHM_W)) == -1) {
1144 if (errno == ENOSYS) {
1145 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
1146 "Your kernel was built without CONFIG_SYSVIPC\n"
1147 "%s: Please consult the Apache FAQ for details",
1151 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
1152 "could not call shmget");
1156 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, server_conf,
1157 "created shared memory segment #%d", shmid);
1161 * Some SysV systems place the shared segment WAY too close
1162 * to the dynamic memory break point (sbrk(0)). This severely
1163 * limits the use of malloc/sbrk in the program since sbrk will
1164 * refuse to move past that point.
1166 * To get around this, we move the break point "way up there",
1167 * attach the segment and then move break back down. Ugly
1169 if ((obrk = sbrk(MOVEBREAK)) == (char *) -1) {
1170 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
1171 "sbrk() could not move break");
1175 #define BADSHMAT ((scoreboard *)(-1))
1176 if ((ap_scoreboard_image = (scoreboard *) shmat(shmid, 0, 0)) == BADSHMAT) {
1177 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf, "shmat error");
1179 * We exit below, after we try to remove the segment
1182 else { /* only worry about permissions if we attached the segment */
1183 if (shmctl(shmid, IPC_STAT, &shmbuf) != 0) {
1184 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
1185 "shmctl() could not stat segment #%d", shmid);
1188 shmbuf.shm_perm.uid = unixd_config.user_id;
1189 shmbuf.shm_perm.gid = unixd_config.group_id;
1190 if (shmctl(shmid, IPC_SET, &shmbuf) != 0) {
1191 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
1192 "shmctl() could not set segment #%d", shmid);
1197 * We must avoid leaving segments in the kernel's
1200 if (shmctl(shmid, IPC_RMID, NULL) != 0) {
1201 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf,
1202 "shmctl: IPC_RMID: could not remove shared memory segment #%d",
1205 if (ap_scoreboard_image == BADSHMAT) /* now bailout */
1209 if (obrk == (char *) -1)
1210 return; /* nothing else to do */
1211 if (sbrk(-(MOVEBREAK)) == (char *) -1) {
1212 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
1213 "sbrk() could not move break back");
1216 ap_scoreboard_image->global.running_generation = 0;
1219 static void reopen_scoreboard(pool *p)
1223 #elif defined(USE_TPF_SCOREBOARD)
1225 static void cleanup_scoreboard_heap()
1228 rv = rsysc(ap_scoreboard_image, SCOREBOARD_FRAMES, SCOREBOARD_NAME);
1229 if(rv == RSYSC_ERROR) {
1230 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
1231 "rsysc() could not release scoreboard system heap");
1235 static void setup_shared_mem(pool *p)
1237 cinfc(CINFC_WRITE, CINFC_CMMCTK2);
1238 ap_scoreboard_image = (scoreboard *) gsysc(SCOREBOARD_FRAMES, SCOREBOARD_NAME);
1240 if (!ap_scoreboard_image) {
1241 fprintf(stderr, "httpd: Could not create scoreboard system heap storage.\n");
1245 ap_register_cleanup(p, NULL, cleanup_scoreboard_heap, ap_null_cleanup);
1246 ap_scoreboard_image->global.running_generation = 0;
1249 static void reopen_scoreboard(pool *p)
1251 cinfc(CINFC_WRITE, CINFC_CMMCTK2);
1255 #define SCOREBOARD_FILE
1256 static scoreboard _scoreboard_image;
1257 static int scoreboard_fd = -1;
1259 /* XXX: things are seriously screwed if we ever have to do a partial
1260 * read or write ... we could get a corrupted scoreboard
1262 static int force_write(int fd, void *buffer, int bufsz)
1264 int rv, orig_sz = bufsz;
1267 rv = write(fd, buffer, bufsz);
1269 buffer = (char *) buffer + rv;
1272 } while ((rv > 0 && bufsz > 0) || (rv == -1 && errno == EINTR));
1274 return rv < 0 ? rv : orig_sz - bufsz;
1277 static int force_read(int fd, void *buffer, int bufsz)
1279 int rv, orig_sz = bufsz;
1282 rv = read(fd, buffer, bufsz);
1284 buffer = (char *) buffer + rv;
1287 } while ((rv > 0 && bufsz > 0) || (rv == -1 && errno == EINTR));
1289 return rv < 0 ? rv : orig_sz - bufsz;
1292 static void cleanup_scoreboard_file(void *foo)
1294 unlink(ap_scoreboard_fname);
1297 void reopen_scoreboard(pool *p)
1299 if (scoreboard_fd != -1)
1300 ap_pclosef(p, scoreboard_fd);
1303 ap_scoreboard_fname = ap_server_root_relative(p, ap_scoreboard_fname);
1305 scoreboard_fd = ap_popenf(p, ap_scoreboard_fname, O_CREAT | O_BINARY | O_RDWR, 0666);
1306 if (scoreboard_fd == -1) {
1307 perror(ap_scoreboard_fname);
1308 fprintf(stderr, "Cannot open scoreboard file:\n");
1309 clean_child_exit(1);
1314 /* Called by parent process */
1315 static void reinit_scoreboard(pool *p)
1317 int running_gen = 0;
1318 if (ap_scoreboard_image)
1319 running_gen = ap_scoreboard_image->global.running_generation;
1321 #ifndef SCOREBOARD_FILE
1322 if (ap_scoreboard_image == NULL) {
1323 setup_shared_mem(p);
1325 memset(ap_scoreboard_image, 0, SCOREBOARD_SIZE);
1326 ap_scoreboard_image->global.running_generation = running_gen;
1328 ap_scoreboard_image = &_scoreboard_image;
1329 ap_scoreboard_fname = ap_server_root_relative(p, ap_scoreboard_fname);
1331 scoreboard_fd = ap_popenf(p, ap_scoreboard_fname, O_CREAT | O_BINARY | O_RDWR, 0644);
1332 if (scoreboard_fd == -1) {
1333 perror(ap_scoreboard_fname);
1334 fprintf(stderr, "Cannot open scoreboard file:\n");
1337 ap_register_cleanup(p, NULL, cleanup_scoreboard_file, ap_null_cleanup);
1339 memset((char *) ap_scoreboard_image, 0, sizeof(*ap_scoreboard_image));
1340 ap_scoreboard_image->global.running_generation = running_gen;
1341 force_write(scoreboard_fd, ap_scoreboard_image, sizeof(*ap_scoreboard_image));
1345 /* Routines called to deal with the scoreboard image
1346 * --- note that we do *not* need write locks, since update_child_status
1347 * only updates a *single* record in place, and only one process writes to
1348 * a given scoreboard slot at a time (either the child process owning that
1349 * slot, or the parent, noting that the child has died).
1351 * As a final note --- setting the score entry to getpid() is always safe,
1352 * since when the parent is writing an entry, it's only noting SERVER_DEAD
1356 ap_inline void ap_sync_scoreboard_image(void)
1358 #ifdef SCOREBOARD_FILE
1359 lseek(scoreboard_fd, 0L, 0);
1360 force_read(scoreboard_fd, ap_scoreboard_image, sizeof(*ap_scoreboard_image));
1364 API_EXPORT(int) ap_exists_scoreboard_image(void)
1366 return (ap_scoreboard_image ? 1 : 0);
1369 static ap_inline void put_scoreboard_info(int child_num,
1370 short_score *new_score_rec)
1372 #ifdef SCOREBOARD_FILE
1373 lseek(scoreboard_fd, (long) child_num * sizeof(short_score), 0);
1374 force_write(scoreboard_fd, new_score_rec, sizeof(short_score));
1378 int ap_update_child_status(int child_num, int status, request_rec *r)
1388 ap_sync_scoreboard_image();
1389 ss = &ap_scoreboard_image->servers[child_num];
1390 old_status = ss->status;
1391 ss->status = status;
1393 if (ap_extended_status) {
1394 if (status == SERVER_READY || status == SERVER_DEAD) {
1396 * Reset individual counters
1398 if (status == SERVER_DEAD) {
1399 ss->my_access_count = 0L;
1400 ss->my_bytes_served = 0L;
1402 ss->conn_count = (unsigned short) 0;
1403 ss->conn_bytes = (unsigned long) 0;
1406 conn_rec *c = r->connection;
1407 ap_cpystrn(ss->client, ap_get_remote_host(c, r->per_dir_config,
1408 REMOTE_NOLOOKUP), sizeof(ss->client));
1409 if (r->the_request == NULL) {
1410 ap_cpystrn(ss->request, "NULL", sizeof(ss->request));
1411 } else if (r->parsed_uri.password == NULL) {
1412 ap_cpystrn(ss->request, r->the_request, sizeof(ss->request));
1414 /* Don't reveal the password in the server-status view */
1415 ap_cpystrn(ss->request, ap_pstrcat(r->pool, r->method, " ",
1416 ap_unparse_uri_components(r->pool, &r->parsed_uri, UNP_OMITPASSWORD),
1417 r->assbackwards ? NULL : " ", r->protocol, NULL),
1418 sizeof(ss->request));
1420 ss->vhostrec = r->server;
1423 if (status == SERVER_STARTING && r == NULL) {
1424 /* clean up the slot's vhostrec pointer (maybe re-used)
1425 * and mark the slot as belonging to a new generation.
1427 ss->vhostrec = NULL;
1428 ap_scoreboard_image->parent[child_num].generation = ap_my_generation;
1429 #ifdef SCOREBOARD_FILE
1430 lseek(scoreboard_fd, XtOffsetOf(scoreboard, parent[child_num]), 0);
1431 force_write(scoreboard_fd, &ap_scoreboard_image->parent[child_num],
1432 sizeof(parent_score));
1435 put_scoreboard_info(child_num, ss);
1440 static void update_scoreboard_global(void)
1442 #ifdef SCOREBOARD_FILE
1443 lseek(scoreboard_fd,
1444 (char *) &ap_scoreboard_image->global -(char *) ap_scoreboard_image, 0);
1445 force_write(scoreboard_fd, &ap_scoreboard_image->global,
1446 sizeof ap_scoreboard_image->global);
1450 void ap_time_process_request(int child_num, int status)
1453 #if defined(NO_GETTIMEOFDAY) && !defined(NO_TIMES)
1460 ap_sync_scoreboard_image();
1461 ss = &ap_scoreboard_image->servers[child_num];
1463 if (status == START_PREQUEST) {
1464 #if defined(NO_GETTIMEOFDAY)
1466 if ((ss->start_time = times(&tms_blk)) == -1)
1467 #endif /* NO_TIMES */
1468 ss->start_time = (clock_t) 0;
1470 if (gettimeofday(&ss->start_time, (struct timezone *) 0) < 0)
1471 ss->start_time.tv_sec =
1472 ss->start_time.tv_usec = 0L;
1475 else if (status == STOP_PREQUEST) {
1476 #if defined(NO_GETTIMEOFDAY)
1478 if ((ss->stop_time = times(&tms_blk)) == -1)
1480 ss->stop_time = ss->start_time = (clock_t) 0;
1482 if (gettimeofday(&ss->stop_time, (struct timezone *) 0) < 0)
1483 ss->stop_time.tv_sec =
1484 ss->stop_time.tv_usec =
1485 ss->start_time.tv_sec =
1486 ss->start_time.tv_usec = 0L;
1491 put_scoreboard_info(child_num, ss);
1495 static void increment_counts(int child_num, request_rec *r)
1500 ap_sync_scoreboard_image();
1501 ss = &ap_scoreboard_image->servers[child_num];
1504 ap_bgetopt(r->connection->client, BO_BYTECT, &bs);
1510 ss->my_access_count++;
1512 ss->bytes_served += (unsigned long) bs;
1513 ss->my_bytes_served += (unsigned long) bs;
1514 ss->conn_bytes += (unsigned long) bs;
1516 put_scoreboard_info(child_num, ss);
1520 static int find_child_by_pid(int pid)
1524 for (i = 0; i < max_daemons_limit; ++i)
1525 if (ap_scoreboard_image->parent[i].pid == pid)
1531 static void reclaim_child_processes(int terminate)
1535 long int waittime = 1024 * 16; /* in usecs */
1539 #ifdef HAS_OTHER_CHILD
1540 other_child_rec *ocr, *nocr;
1543 ap_sync_scoreboard_image();
1545 for (tries = terminate ? 4 : 1; tries <= 9; ++tries) {
1546 /* don't want to hold up progress any more than
1547 * necessary, but we need to allow children a few moments to exit.
1548 * Set delay with an exponential backoff.
1550 tv.tv_sec = waittime / 1000000;
1551 tv.tv_usec = waittime % 1000000;
1552 waittime = waittime * 4;
1553 ap_select(0, NULL, NULL, NULL, &tv);
1555 /* now see who is done */
1557 for (i = 0; i < max_daemons_limit; ++i) {
1558 int pid = ap_scoreboard_image->parent[i].pid;
1560 if (pid == my_pid || pid == 0)
1563 waitret = waitpid(pid, &status, WNOHANG);
1564 if (waitret == pid || waitret == -1) {
1565 ap_scoreboard_image->parent[i].pid = 0;
1574 /* perhaps it missed the SIGHUP, lets try again */
1575 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
1577 "child process %d did not exit, sending another SIGHUP",
1580 waittime = 1024 * 16;
1586 case 7: /* 1.4sec */
1587 /* ok, now it's being annoying */
1588 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
1590 "child process %d still did not exit, sending a SIGTERM",
1595 /* die child scum */
1596 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, server_conf,
1597 "child process %d still did not exit, sending a SIGKILL",
1601 case 9: /* 14 sec */
1602 /* gave it our best shot, but alas... If this really
1603 * is a child we are trying to kill and it really hasn't
1604 * exited, we will likely fail to bind to the port
1605 * after the restart.
1607 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, server_conf,
1608 "could not make child process %d exit, "
1609 "attempting to continue anyway", pid);
1613 #ifdef HAS_OTHER_CHILD
1614 for (ocr = other_children; ocr; ocr = nocr) {
1619 waitret = waitpid(ocr->pid, &status, WNOHANG);
1620 if (waitret == ocr->pid) {
1622 (*ocr->maintenance) (OC_REASON_DEATH, ocr->data, status);
1624 else if (waitret == 0) {
1625 (*ocr->maintenance) (OC_REASON_RESTART, ocr->data, -1);
1628 else if (waitret == -1) {
1629 /* uh what the heck? they didn't call unregister? */
1631 (*ocr->maintenance) (OC_REASON_LOST, ocr->data, -1);
1635 if (!not_dead_yet) {
1636 /* nothing left to wait for */
1640 #endif /* ndef MULTITHREAD */
1644 #if defined(NEED_WAITPID)
1646 Systems without a real waitpid sometimes lose a child's exit while waiting
1647 for another. Search through the scoreboard for missing children.
1649 int reap_children(ap_wait_t *status)
1653 for (n = 0; n < max_daemons_limit; ++n) {
1654 ap_sync_scoreboard_image();
1655 if (ap_scoreboard_image->servers[n].status != SERVER_DEAD &&
1656 kill((pid = ap_scoreboard_image->parent[n].pid), 0) == -1) {
1657 ap_update_child_status(n, SERVER_DEAD, NULL);
1658 /* just mark it as having a successful exit status */
1659 bzero((char *) status, sizeof(ap_wait_t));
1667 /* Finally, this routine is used by the caretaker process to wait for
1671 /* number of calls to wait_or_timeout between writable probes */
1672 #ifndef INTERVAL_OF_WRITABLE_PROBES
1673 #define INTERVAL_OF_WRITABLE_PROBES 10
1675 static int wait_or_timeout_counter;
1677 static int wait_or_timeout(ap_wait_t *status)
1682 ++wait_or_timeout_counter;
1683 if (wait_or_timeout_counter == INTERVAL_OF_WRITABLE_PROBES) {
1684 wait_or_timeout_counter = 0;
1685 #ifdef HAS_OTHER_CHILD
1686 probe_writable_fds();
1689 ret = waitpid(-1, status, WNOHANG);
1690 if (ret == -1 && errno == EINTR) {
1697 if ((ret = reap_children(status)) > 0) {
1701 tv.tv_sec = SCOREBOARD_MAINTENANCE_INTERVAL / 1000000;
1702 tv.tv_usec = SCOREBOARD_MAINTENANCE_INTERVAL % 1000000;
1703 ap_select(0, NULL, NULL, NULL, &tv);
1707 /* handle all varieties of core dumping signals */
1708 static void sig_coredump(int sig)
1710 chdir(ap_coredump_dir);
1711 signal(sig, SIG_DFL);
1712 kill(getpid(), sig);
1713 /* At this point we've got sig blocked, because we're still inside
1714 * the signal handler. When we leave the signal handler it will
1715 * be unblocked, and we'll take the signal... and coredump or whatever
1716 * is appropriate for this particular Unix. In addition the parent
1717 * will see the real signal we received -- whereas if we called
1718 * abort() here, the parent would only see SIGABRT.
1722 /*****************************************************************
1723 * Connection structures and accounting...
1726 static void just_die(int sig)
1728 clean_child_exit(0);
1731 static int volatile deferred_die;
1732 static int volatile usr1_just_die;
1734 static void usr1_handler(int sig)
1736 if (usr1_just_die) {
1742 /* volatile just in case */
1743 static int volatile shutdown_pending;
1744 static int volatile restart_pending;
1745 static int volatile is_graceful;
1746 ap_generation_t volatile ap_my_generation=0;
1748 static void sig_term(int sig)
1750 if (shutdown_pending == 1) {
1751 /* Um, is this _probably_ not an error, if the user has
1752 * tried to do a shutdown twice quickly, so we won't
1753 * worry about reporting it.
1757 shutdown_pending = 1;
1760 static void restart(int sig)
1762 if (restart_pending == 1) {
1763 /* Probably not an error - don't bother reporting it */
1766 restart_pending = 1;
1767 is_graceful = sig == SIGUSR1;
1770 static void set_signals(void)
1772 #ifndef NO_USE_SIGACTION
1773 struct sigaction sa;
1775 sigemptyset(&sa.sa_mask);
1779 sa.sa_handler = sig_coredump;
1780 #if defined(SA_ONESHOT)
1781 sa.sa_flags = SA_ONESHOT;
1782 #elif defined(SA_RESETHAND)
1783 sa.sa_flags = SA_RESETHAND;
1785 if (sigaction(SIGSEGV, &sa, NULL) < 0)
1786 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGSEGV)");
1788 if (sigaction(SIGBUS, &sa, NULL) < 0)
1789 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGBUS)");
1792 if (sigaction(SIGABORT, &sa, NULL) < 0)
1793 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGABORT)");
1796 if (sigaction(SIGABRT, &sa, NULL) < 0)
1797 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGABRT)");
1800 if (sigaction(SIGILL, &sa, NULL) < 0)
1801 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGILL)");
1805 sa.sa_handler = sig_term;
1806 if (sigaction(SIGTERM, &sa, NULL) < 0)
1807 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGTERM)");
1809 if (sigaction(SIGINT, &sa, NULL) < 0)
1810 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGINT)");
1813 sa.sa_handler = SIG_DFL;
1814 if (sigaction(SIGXCPU, &sa, NULL) < 0)
1815 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGXCPU)");
1818 sa.sa_handler = SIG_DFL;
1819 if (sigaction(SIGXFSZ, &sa, NULL) < 0)
1820 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGXFSZ)");
1823 sa.sa_handler = SIG_IGN;
1824 if (sigaction(SIGPIPE, &sa, NULL) < 0)
1825 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGPIPE)");
1828 /* we want to ignore HUPs and USR1 while we're busy processing one */
1829 sigaddset(&sa.sa_mask, SIGHUP);
1830 sigaddset(&sa.sa_mask, SIGUSR1);
1831 sa.sa_handler = restart;
1832 if (sigaction(SIGHUP, &sa, NULL) < 0)
1833 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGHUP)");
1834 if (sigaction(SIGUSR1, &sa, NULL) < 0)
1835 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGUSR1)");
1838 signal(SIGSEGV, sig_coredump);
1840 signal(SIGBUS, sig_coredump);
1843 signal(SIGABORT, sig_coredump);
1844 #endif /* SIGABORT */
1846 signal(SIGABRT, sig_coredump);
1847 #endif /* SIGABRT */
1849 signal(SIGILL, sig_coredump);
1852 signal(SIGXCPU, SIG_DFL);
1853 #endif /* SIGXCPU */
1855 signal(SIGXFSZ, SIG_DFL);
1856 #endif /* SIGXFSZ */
1859 signal(SIGTERM, sig_term);
1861 signal(SIGHUP, restart);
1864 signal(SIGUSR1, restart);
1865 #endif /* SIGUSR1 */
1867 signal(SIGPIPE, SIG_IGN);
1868 #endif /* SIGPIPE */
1873 #if defined(TCP_NODELAY) && !defined(MPE) && !defined(TPF)
1874 static void sock_disable_nagle(int s)
1876 /* The Nagle algorithm says that we should delay sending partial
1877 * packets in hopes of getting more data. We don't want to do
1878 * this; we are not telnet. There are bad interactions between
1879 * persistent connections and Nagle's algorithm that have very severe
1880 * performance penalties. (Failing to disable Nagle is not much of a
1881 * problem with simple HTTP.)
1883 * In spite of these problems, failure here is not a shooting offense.
1885 int just_say_no = 1;
1887 if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (char *) &just_say_no,
1889 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf,
1890 "setsockopt: (TCP_NODELAY)");
1895 #define sock_disable_nagle(s) /* NOOP */
1899 /*****************************************************************
1900 * Child process main loop.
1901 * The following vars are static to avoid getting clobbered by longjmp();
1902 * they are really private to child_main.
1907 static int requests_this_child;
1908 static fd_set main_fds;
1910 API_EXPORT(void) ap_child_terminate(request_rec *r)
1912 r->connection->keepalive = 0;
1913 requests_this_child = ap_max_requests_per_child = 1;
1916 int ap_graceful_stop_signalled(void)
1918 ap_sync_scoreboard_image();
1920 ap_scoreboard_image->global.running_generation != ap_my_generation) {
1926 static void child_main(int child_num_arg)
1929 struct sockaddr sa_server;
1930 struct sockaddr sa_client;
1932 ap_listen_rec *last_lr;
1933 ap_listen_rec *first_lr;
1935 conn_rec *current_conn;
1940 my_child_num = child_num_arg;
1941 requests_this_child = 0;
1944 /* Get a sub pool for global allocations in this child, so that
1945 * we can have cleanups occur when the child exits.
1947 pchild = ap_make_sub_pool(pconf);
1949 ptrans = ap_make_sub_pool(pchild);
1951 /* needs to be done before we switch UIDs so we have permissions */
1952 reopen_scoreboard(pchild);
1953 SAFE_ACCEPT(accept_mutex_child_init(pchild));
1955 if (unixd_setup_child()) {
1956 clean_child_exit(APEXIT_CHILDFATAL);
1959 ap_child_init_hook(pchild, server_conf);
1961 (void) ap_update_child_status(my_child_num, SERVER_READY, (request_rec *) NULL);
1963 signal(SIGHUP, just_die);
1964 signal(SIGTERM, just_die);
1967 /* Stop Ctrl-C/Ctrl-Break signals going to child processes */
1969 unsigned long ulTimes;
1970 DosSetSignalExceptionFocus(0, &ulTimes);
1974 while (!ap_graceful_stop_signalled()) {
1977 /* Prepare to receive a SIGUSR1 due to graceful restart so that
1978 * we can exit cleanly.
1981 signal(SIGUSR1, usr1_handler);
1984 * (Re)initialize this child to a pre-connection state.
1987 current_conn = NULL;
1989 ap_clear_pool(ptrans);
1991 if ((ap_max_requests_per_child > 0
1992 && requests_this_child++ >= ap_max_requests_per_child)) {
1993 clean_child_exit(0);
1996 (void) ap_update_child_status(my_child_num, SERVER_READY, (request_rec *) NULL);
1999 * Wait for an acceptable connection to arrive.
2002 /* Lock around "accept", if necessary */
2003 SAFE_ACCEPT(accept_mutex_on());
2006 if (ap_listeners->next) {
2007 /* more than one socket */
2008 memcpy(&main_fds, &listenfds, sizeof(fd_set));
2009 srv = ap_select(listenmaxfd + 1, &main_fds, NULL, NULL, NULL);
2011 if (srv < 0 && errno != EINTR) {
2012 /* Single Unix documents select as returning errnos
2013 * EBADF, EINTR, and EINVAL... and in none of those
2014 * cases does it make sense to continue. In fact
2015 * on Linux 2.0.x we seem to end up with EFAULT
2016 * occasionally, and we'd loop forever due to it.
2018 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf, "select: (listen)");
2019 clean_child_exit(1);
2025 /* we remember the last_lr we searched last time around so that
2026 we don't end up starving any particular listening socket */
2027 if (last_lr == NULL) {
2037 if (FD_ISSET(lr->fd, &main_fds))
2043 while (lr != first_lr);
2044 /* FIXME: if we get here, something bad has happened, and we're
2045 probably gonna spin forever.
2053 /* only one socket, just pretend we did the other stuff */
2054 sd = ap_listeners->fd;
2057 /* if we accept() something we don't want to die, so we have to
2063 /* we didn't get a socket, and we were told to die */
2064 clean_child_exit(0);
2066 clen = sizeof(sa_client);
2067 csd = ap_accept(sd, &sa_client, &clen);
2068 if (csd >= 0 || errno != EINTR)
2073 break; /* We have a socket ready for reading */
2076 /* TODO: this accept result handling stuff should be abstracted...
2077 * it's already out of date between the various unix mpms
2079 /* Our old behaviour here was to continue after accept()
2080 * errors. But this leads us into lots of troubles
2081 * because most of the errors are quite fatal. For
2082 * example, EMFILE can be caused by slow descriptor
2083 * leaks (say in a 3rd party module, or libc). It's
2084 * foolish for us to continue after an EMFILE. We also
2085 * seem to tickle kernel bugs on some platforms which
2086 * lead to never-ending loops here. So it seems best
2087 * to just exit in most cases.
2091 /* EPROTO on certain older kernels really means
2092 * ECONNABORTED, so we need to ignore it for them.
2093 * See discussion in new-httpd archives nh.9701
2094 * search for EPROTO.
2096 * Also see nh.9603, search for EPROTO:
2097 * There is potentially a bug in Solaris 2.x x<6,
2098 * and other boxes that implement tcp sockets in
2099 * userland (i.e. on top of STREAMS). On these
2100 * systems, EPROTO can actually result in a fatal
2101 * loop. See PR#981 for example. It's hard to
2102 * handle both uses of EPROTO.
2109 /* Linux generates the rest of these, other tcp
2110 * stacks (i.e. bsd) tend to hide them behind
2111 * getsockopt() interfaces. They occur when
2112 * the net goes sour or the client disconnects
2113 * after the three-way handshake has been done
2114 * in the kernel but before userland has picked
2133 * When the network layer has been shut down, there
2134 * is not much use in simply exiting: the parent
2135 * would simply re-create us (and we'd fail again).
2136 * Use the CHILDFATAL code to tear the server down.
2137 * @@@ Martin's idea for possible improvement:
2138 * A different approach would be to define
2139 * a new APEXIT_NETDOWN exit code, the reception
2140 * of which would make the parent shutdown all
2141 * children, then idle-loop until it detected that
2142 * the network is up again, and restart the children.
2143 * Ben Hyde noted that temporary ENETDOWN situations
2144 * occur in mobile IP.
2146 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
2147 "accept: giving up.");
2148 clean_child_exit(APEXIT_CHILDFATAL);
2153 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
2154 "offload device inactive");
2155 clean_child_exit(APEXIT_CHILDFATAL);
2158 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, server_conf,
2159 "select/accept error (%u)", errno);
2160 clean_child_exit(APEXIT_CHILDFATAL);
2163 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
2164 "accept: (client socket)");
2165 clean_child_exit(1);
2170 if (ap_graceful_stop_signalled()) {
2171 clean_child_exit(0);
2176 SAFE_ACCEPT(accept_mutex_off()); /* unlock after "accept" */
2179 if (csd == 0) /* 0 is invalid socket for TPF */
2183 /* We've got a socket, let's at least process one request off the
2184 * socket before we accept a graceful restart request. We set
2185 * the signal to ignore because we don't want to disturb any
2188 signal(SIGUSR1, SIG_IGN);
2191 * We now have a connection, so set it up with the appropriate
2192 * socket options, file descriptors, and read/write buffers.
2195 clen = sizeof(sa_server);
2196 if (getsockname(csd, &sa_server, &clen) < 0) {
2197 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf, "getsockname");
2202 sock_disable_nagle(csd);
2204 iol = unix_attach_socket(csd);
2206 if (errno == EBADF) {
2207 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, NULL,
2208 "filedescriptor (%u) larger than FD_SETSIZE (%u) "
2209 "found, you probably need to rebuild Apache with a "
2210 "larger FD_SETSIZE", csd, FD_SETSIZE);
2213 ap_log_error(APLOG_MARK, APLOG_WARNING, NULL,
2214 "error attaching to socket");
2220 (void) ap_update_child_status(my_child_num, SERVER_BUSY_READ,
2221 (request_rec *) NULL);
2223 conn_io = ap_bcreate(ptrans, B_RDWR);
2225 ap_bpush_iol(conn_io, iol);
2227 current_conn = ap_new_connection(ptrans, server_conf, conn_io,
2228 (struct sockaddr_in *) &sa_client,
2229 (struct sockaddr_in *) &sa_server,
2232 ap_process_connection(current_conn);
2237 static int make_child(server_rec *s, int slot, time_t now)
2241 if (slot + 1 > max_daemons_limit) {
2242 max_daemons_limit = slot + 1;
2246 signal(SIGHUP, just_die);
2247 signal(SIGINT, just_die);
2249 signal(SIGQUIT, SIG_DFL);
2251 signal(SIGTERM, just_die);
2255 (void) ap_update_child_status(slot, SERVER_STARTING, (request_rec *) NULL);
2259 /* BS2000 requires a "special" version of fork() before a setuid() call */
2260 if ((pid = os_fork(unixd_config.user_name)) == -1) {
2262 if ((pid = os_fork(s, slot)) == -1) {
2264 if ((pid = fork()) == -1) {
2266 ap_log_error(APLOG_MARK, APLOG_ERR, s, "fork: Unable to fork new process");
2268 /* fork didn't succeed. Fix the scoreboard or else
2269 * it will say SERVER_STARTING forever and ever
2271 (void) ap_update_child_status(slot, SERVER_DEAD, (request_rec *) NULL);
2273 /* In case system resources are maxxed out, we don't want
2274 Apache running away with the CPU trying to fork over and
2275 over and over again. */
2282 #ifdef AIX_BIND_PROCESSOR
2283 /* by default AIX binds to a single processor
2284 * this bit unbinds children which will then bind to another cpu
2286 #include <sys/processor.h>
2287 int status = bindprocessor(BINDPROCESS, (int)getpid(),
2288 PROCESSOR_CLASS_ANY);
2290 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, server_conf,
2291 "processor unbind failed %d", status);
2294 RAISE_SIGSTOP(MAKE_CHILD);
2295 /* Disable the restart signal handlers and enable the just_die stuff.
2296 * Note that since restart() just notes that a restart has been
2297 * requested there's no race condition here.
2299 signal(SIGHUP, just_die);
2300 signal(SIGUSR1, just_die);
2301 signal(SIGTERM, just_die);
2305 ap_scoreboard_image->parent[slot].pid = pid;
2306 #ifdef SCOREBOARD_FILE
2307 lseek(scoreboard_fd, XtOffsetOf(scoreboard, parent[slot]), 0);
2308 force_write(scoreboard_fd, &ap_scoreboard_image->parent[slot],
2309 sizeof(parent_score));
2316 /* start up a bunch of children */
2317 static void startup_children(int number_to_start)
2320 time_t now = time(0);
2322 for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
2323 if (ap_scoreboard_image->servers[i].status != SERVER_DEAD) {
2326 if (make_child(server_conf, i, now) < 0) {
2335 * idle_spawn_rate is the number of children that will be spawned on the
2336 * next maintenance cycle if there aren't enough idle servers. It is
2337 * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
2338 * without the need to spawn.
2340 static int idle_spawn_rate = 1;
2341 #ifndef MAX_SPAWN_RATE
2342 #define MAX_SPAWN_RATE (32)
2344 static int hold_off_on_exponential_spawning;
2346 static void perform_idle_server_maintenance(void)
2352 time_t now = time(0);
2354 int free_slots[MAX_SPAWN_RATE];
2358 /* initialize the free_list */
2366 ap_sync_scoreboard_image();
2367 for (i = 0; i < ap_daemons_limit; ++i) {
2370 if (i >= max_daemons_limit && free_length == idle_spawn_rate)
2372 ss = &ap_scoreboard_image->servers[i];
2373 status = ss->status;
2374 if (status == SERVER_DEAD) {
2375 /* try to keep children numbers as low as possible */
2376 if (free_length < idle_spawn_rate) {
2377 free_slots[free_length] = i;
2382 /* We consider a starting server as idle because we started it
2383 * at least a cycle ago, and if it still hasn't finished starting
2384 * then we're just going to swamp things worse by forking more.
2385 * So we hopefully won't need to fork more if we count it.
2386 * This depends on the ordering of SERVER_READY and SERVER_STARTING.
2388 if (status <= SERVER_READY) {
2390 /* always kill the highest numbered child if we have to...
2391 * no really well thought out reason ... other than observing
2392 * the server behaviour under linux where lower numbered children
2393 * tend to service more hits (and hence are more likely to have
2394 * their data in cpu caches).
2403 max_daemons_limit = last_non_dead + 1;
2404 if (idle_count > ap_daemons_max_free) {
2405 /* kill off one child... we use SIGUSR1 because that'll cause it to
2406 * shut down gracefully, in case it happened to pick up a request
2407 * while we were counting
2409 kill(ap_scoreboard_image->parent[to_kill].pid, SIGUSR1);
2410 idle_spawn_rate = 1;
2412 else if (idle_count < ap_daemons_min_free) {
2413 /* terminate the free list */
2414 if (free_length == 0) {
2415 /* only report this condition once */
2416 static int reported = 0;
2419 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, server_conf,
2420 "server reached MaxClients setting, consider"
2421 " raising the MaxClients setting");
2424 idle_spawn_rate = 1;
2427 if (idle_spawn_rate >= 8) {
2428 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, server_conf,
2429 "server seems busy, (you may need "
2430 "to increase StartServers, or Min/MaxSpareServers), "
2431 "spawning %d children, there are %d idle, and "
2432 "%d total children", idle_spawn_rate,
2433 idle_count, total_non_dead);
2435 for (i = 0; i < free_length; ++i) {
2437 if(make_child(server_conf, free_slots[i], now) == -1) {
2438 if(free_length == 1) {
2439 shutdown_pending = 1;
2440 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
2441 "No active child processes: shutting down");
2445 make_child(server_conf, free_slots[i], now);
2448 /* the next time around we want to spawn twice as many if this
2449 * wasn't good enough, but not if we've just done a graceful
2451 if (hold_off_on_exponential_spawning) {
2452 --hold_off_on_exponential_spawning;
2454 else if (idle_spawn_rate < MAX_SPAWN_RATE) {
2455 idle_spawn_rate *= 2;
2460 idle_spawn_rate = 1;
2465 static void process_child_status(int pid, ap_wait_t status)
2467 /* Child died... if it died due to a fatal error,
2468 * we should simply bail out.
2470 if ((WIFEXITED(status)) &&
2471 WEXITSTATUS(status) == APEXIT_CHILDFATAL) {
2472 ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_NOERRNO, server_conf,
2473 "Child %d returned a Fatal error... \n"
2474 "Apache is exiting!",
2476 exit(APEXIT_CHILDFATAL);
2478 if (WIFSIGNALED(status)) {
2479 switch (WTERMSIG(status)) {
2488 if (WCOREDUMP(status)) {
2489 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
2491 "child pid %d exit signal %s (%d), "
2492 "possible coredump in %s",
2493 pid, (WTERMSIG(status) >= NumSIG) ? "" :
2494 SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status),
2499 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
2501 "child pid %d exit signal %s (%d)", pid,
2502 SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status));
2507 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
2509 "child pid %d exit signal %d",
2510 pid, WTERMSIG(status));
2517 static int setup_listeners(pool *pconf, server_rec *s)
2521 if (ap_listen_open(pconf, s->port)) {
2522 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, s,
2523 "no listening sockets available, shutting down");
2528 FD_ZERO(&listenfds);
2529 for (lr = ap_listeners; lr; lr = lr->next) {
2530 FD_SET(lr->fd, &listenfds);
2531 if (lr->fd > listenmaxfd) {
2532 listenmaxfd = lr->fd;
2539 /*****************************************************************
2540 * Executive routines.
2543 int ap_mpm_run(pool *_pconf, pool *plog, server_rec *s)
2545 int remaining_children_to_start;
2551 ap_log_pid(pconf, ap_pid_fname);
2553 if (setup_listeners(pconf, s)) {
2554 /* XXX: hey, what's the right way for the mpm to indicate a fatal error? */
2558 SAFE_ACCEPT(accept_mutex_init(pconf));
2560 reinit_scoreboard(pconf);
2562 #ifdef SCOREBOARD_FILE
2564 ap_scoreboard_fname = ap_server_root_relative(pconf, ap_scoreboard_fname);
2565 ap_note_cleanups_for_fd(pconf, scoreboard_fd);
2571 if (ap_daemons_max_free < ap_daemons_min_free + 1) /* Don't thrash... */
2572 ap_daemons_max_free = ap_daemons_min_free + 1;
2574 /* If we're doing a graceful_restart then we're going to see a lot
2575 * of children exiting immediately when we get into the main loop
2576 * below (because we just sent them SIGUSR1). This happens pretty
2577 * rapidly... and for each one that exits we'll start a new one until
2578 * we reach at least daemons_min_free. But we may be permitted to
2579 * start more than that, so we'll just keep track of how many we're
2580 * supposed to start up without the 1 second penalty between each fork.
2582 remaining_children_to_start = ap_daemons_to_start;
2583 if (remaining_children_to_start > ap_daemons_limit) {
2584 remaining_children_to_start = ap_daemons_limit;
2587 startup_children(remaining_children_to_start);
2588 remaining_children_to_start = 0;
2591 /* give the system some time to recover before kicking into
2592 * exponential mode */
2593 hold_off_on_exponential_spawning = 10;
2596 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
2597 "%s configured -- resuming normal operations",
2598 ap_get_server_version());
2599 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, server_conf,
2600 "Server built: %s", ap_get_server_built());
2601 restart_pending = shutdown_pending = 0;
2603 while (!restart_pending && !shutdown_pending) {
2606 int pid = wait_or_timeout(&status);
2608 /* XXX: if it takes longer than 1 second for all our children
2609 * to start up and get into IDLE state then we may spawn an
2613 process_child_status(pid, status);
2614 /* non-fatal death... note that it's gone in the scoreboard. */
2615 ap_sync_scoreboard_image();
2616 child_slot = find_child_by_pid(pid);
2617 if (child_slot >= 0) {
2618 (void) ap_update_child_status(child_slot, SERVER_DEAD,
2619 (request_rec *) NULL);
2620 if (remaining_children_to_start
2621 && child_slot < ap_daemons_limit) {
2622 /* we're still doing a 1-for-1 replacement of dead
2623 * children with new children
2625 make_child(server_conf, child_slot, time(0));
2626 --remaining_children_to_start;
2628 #ifdef HAS_OTHER_CHILD
2630 else if (reap_other_child(pid, status) == 0) {
2634 else if (is_graceful) {
2635 /* Great, we've probably just lost a slot in the
2636 * scoreboard. Somehow we don't know about this
2639 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, server_conf,
2640 "long lost child came home! (pid %d)", pid);
2642 /* Don't perform idle maintenance when a child dies,
2643 * only do it when there's a timeout. Remember only a
2644 * finite number of children can die, and it's pretty
2645 * pathological for a lot to die suddenly.
2649 else if (remaining_children_to_start) {
2650 /* we hit a 1 second timeout in which none of the previous
2651 * generation of children needed to be reaped... so assume
2652 * they're all done, and pick up the slack if any is left.
2654 startup_children(remaining_children_to_start);
2655 remaining_children_to_start = 0;
2656 /* In any event we really shouldn't do the code below because
2657 * few of the servers we just started are in the IDLE state
2658 * yet, so we'd mistakenly create an extra server.
2663 perform_idle_server_maintenance();
2665 shutdown_pending = os_check_server(tpf_server_name);
2671 if (shutdown_pending) {
2672 /* Time to gracefully shut down:
2673 * Kill child processes, tell them to call child_exit, etc...
2675 if (ap_killpg(getpgrp(), SIGTERM) < 0) {
2676 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "killpg SIGTERM");
2678 reclaim_child_processes(1); /* Start with SIGTERM */
2680 /* cleanup pid file on normal shutdown */
2682 const char *pidfile = NULL;
2683 pidfile = ap_server_root_relative (pconf, ap_pid_fname);
2684 if ( pidfile != NULL && unlink(pidfile) == 0)
2685 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO,
2687 "removed PID file %s (pid=%ld)",
2688 pidfile, (long)getpid());
2691 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
2692 "caught SIGTERM, shutting down");
2696 /* we've been told to restart */
2697 signal(SIGHUP, SIG_IGN);
2698 signal(SIGUSR1, SIG_IGN);
2701 /* not worth thinking about */
2705 /* advance to the next generation */
2706 /* XXX: we really need to make sure this new generation number isn't in
2707 * use by any of the children.
2710 ap_scoreboard_image->global.running_generation = ap_my_generation;
2711 update_scoreboard_global();
2714 #ifndef SCOREBOARD_FILE
2717 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
2718 "SIGUSR1 received. Doing graceful restart");
2720 /* kill off the idle ones */
2721 if (ap_killpg(getpgrp(), SIGUSR1) < 0) {
2722 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "killpg SIGUSR1");
2724 #ifndef SCOREBOARD_FILE
2725 /* This is mostly for debugging... so that we know what is still
2726 * gracefully dealing with existing request. But we can't really
2727 * do it if we're in a SCOREBOARD_FILE because it'll cause
2728 * corruption too easily.
2730 ap_sync_scoreboard_image();
2731 for (i = 0; i < ap_daemons_limit; ++i) {
2732 if (ap_scoreboard_image->servers[i].status != SERVER_DEAD) {
2733 ap_scoreboard_image->servers[i].status = SERVER_GRACEFUL;
2740 if (ap_killpg(getpgrp(), SIGHUP) < 0) {
2741 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "killpg SIGHUP");
2743 reclaim_child_processes(0); /* Not when just starting up */
2744 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
2745 "SIGHUP received. Attempting to restart");
2749 ap_restart_time = time(NULL);
2755 static void prefork_pre_config(pool *pconf, pool *plog, pool *ptemp)
2757 static int restart_num = 0;
2759 one_process = !!getenv("ONE_PROCESS");
2761 /* sigh, want this only the second time around */
2762 if (restart_num++ == 1) {
2773 ap_listen_pre_config();
2774 ap_daemons_to_start = DEFAULT_START_DAEMON;
2775 ap_daemons_min_free = DEFAULT_MIN_FREE_DAEMON;
2776 ap_daemons_max_free = DEFAULT_MAX_FREE_DAEMON;
2777 ap_daemons_limit = HARD_SERVER_LIMIT;
2778 ap_pid_fname = DEFAULT_PIDLOG;
2779 ap_scoreboard_fname = DEFAULT_SCOREBOARD;
2780 ap_lock_fname = DEFAULT_LOCKFILE;
2781 ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
2782 ap_extended_status = 0;
2784 ap_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
2787 static void prefork_hooks(void)
2789 ap_hook_pre_config(prefork_pre_config,NULL,NULL,HOOK_MIDDLE);
2794 /* TODO: set one_process properly */ one_process = 0;
2797 static const char *set_pidfile(cmd_parms *cmd, void *dummy, char *arg)
2799 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2804 if (cmd->server->is_virtual) {
2805 return "PidFile directive not allowed in <VirtualHost>";
2811 static const char *set_scoreboard(cmd_parms *cmd, void *dummy, char *arg)
2813 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2818 ap_scoreboard_fname = arg;
2822 static const char *set_lockfile(cmd_parms *cmd, void *dummy, char *arg)
2824 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2829 ap_lock_fname = arg;
2833 static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy, char *arg)
2835 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2840 ap_daemons_to_start = atoi(arg);
2844 static const char *set_min_free_servers(cmd_parms *cmd, void *dummy, char *arg)
2846 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2851 ap_daemons_min_free = atoi(arg);
2852 if (ap_daemons_min_free <= 0) {
2853 fprintf(stderr, "WARNING: detected MinSpareServers set to non-positive.\n");
2854 fprintf(stderr, "Resetting to 1 to avoid almost certain Apache failure.\n");
2855 fprintf(stderr, "Please read the documentation.\n");
2856 ap_daemons_min_free = 1;
2862 static const char *set_max_free_servers(cmd_parms *cmd, void *dummy, char *arg)
2864 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2869 ap_daemons_max_free = atoi(arg);
2873 static const char *set_server_limit (cmd_parms *cmd, void *dummy, char *arg)
2875 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2880 ap_daemons_limit = atoi(arg);
2881 if (ap_daemons_limit > HARD_SERVER_LIMIT) {
2882 fprintf(stderr, "WARNING: MaxClients of %d exceeds compile time limit "
2883 "of %d servers,\n", ap_daemons_limit, HARD_SERVER_LIMIT);
2884 fprintf(stderr, " lowering MaxClients to %d. To increase, please "
2885 "see the\n", HARD_SERVER_LIMIT);
2886 fprintf(stderr, " HARD_SERVER_LIMIT define in src/include/httpd.h.\n");
2887 ap_daemons_limit = HARD_SERVER_LIMIT;
2889 else if (ap_daemons_limit < 1) {
2890 fprintf(stderr, "WARNING: Require MaxClients > 0, setting to 1\n");
2891 ap_daemons_limit = 1;
2896 static const char *set_max_requests(cmd_parms *cmd, void *dummy, char *arg)
2898 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2903 ap_max_requests_per_child = atoi(arg);
2908 static const char *set_coredumpdir (cmd_parms *cmd, void *dummy, char *arg)
2912 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2917 fname = ap_server_root_relative(cmd->pool, arg);
2918 /* ZZZ change this to the AP func FileInfo*/
2919 if ((stat(fname, &finfo) == -1) || !S_ISDIR(finfo.st_mode)) {
2920 return ap_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
2921 " does not exist or is not a directory", NULL);
2923 ap_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir));
2927 /* there are no threads in the prefork model, so the mutexes are
2929 /* TODO: make these #defines to eliminate the function call */
2931 struct ap_thread_mutex {
2935 API_EXPORT(ap_thread_mutex *) ap_thread_mutex_new(void)
2937 return malloc(sizeof(ap_thread_mutex));
2940 API_EXPORT(void) ap_thread_mutex_lock(ap_thread_mutex *mtx)
2944 API_EXPORT(void) ap_thread_mutex_unlock(ap_thread_mutex *mtx)
2948 API_EXPORT(void) ap_thread_mutex_destroy(ap_thread_mutex *mtx)
2954 static const command_rec prefork_cmds[] = {
2955 UNIX_DAEMON_COMMANDS
2957 { "PidFile", set_pidfile, NULL, RSRC_CONF, TAKE1,
2958 "A file for logging the server process ID"},
2959 { "ScoreBoardFile", set_scoreboard, NULL, RSRC_CONF, TAKE1,
2960 "A file for Apache to maintain runtime process management information"},
2961 { "LockFile", set_lockfile, NULL, RSRC_CONF, TAKE1,
2962 "The lockfile used when Apache needs to lock the accept() call"},
2963 { "StartServers", set_daemons_to_start, NULL, RSRC_CONF, TAKE1,
2964 "Number of child processes launched at server startup" },
2965 { "MinSpareServers", set_min_free_servers, NULL, RSRC_CONF, TAKE1,
2966 "Minimum number of idle children, to handle request spikes" },
2967 { "MaxSpareServers", set_max_free_servers, NULL, RSRC_CONF, TAKE1,
2968 "Maximum number of idle children" },
2969 { "MaxClients", set_server_limit, NULL, RSRC_CONF, TAKE1,
2970 "Maximum number of children alive at the same time" },
2971 { "MaxRequestsPerChild", set_max_requests, NULL, RSRC_CONF, TAKE1,
2972 "Maximum number of requests a particular child serves before dying." },
2973 { "CoreDumpDirectory", set_coredumpdir, NULL, RSRC_CONF, TAKE1,
2974 "The location of the directory Apache changes to before dumping core" },
2978 module MODULE_VAR_EXPORT mpm_prefork_module = {
2979 STANDARD20_MODULE_STUFF,
2980 NULL, /* child_init */
2981 NULL, /* create per-directory config structure */
2982 NULL, /* merge per-directory config structures */
2983 NULL, /* create per-server config structure */
2984 NULL, /* merge per-server config structures */
2985 prefork_cmds, /* command table */
2986 NULL, /* handlers */
2987 NULL, /* check auth */
2988 prefork_hooks, /* register hooks */