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
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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 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;
138 static ap_socket_t *sd;
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 ap_context_t *pconf; /* Pool for config stuff */
169 static ap_context_t *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(ap_context_t *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(ap_context_t *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(ap_context_t *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(ap_context_t *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(ap_context_t *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 /* preinitialize 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(ap_context_t *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 ap_open(&tempfile, ap_lock_fname, APR_CREATE | APR_WRITE | APR_EXCL,
545 APR_UREAD | APR_UWRITE | APR_GREAD | APR_WREAD, p);
546 ap_get_os_file(&lock_fd, tempfile);
549 fprintf(stderr, "Cannot open lock file: %s\n", ap_lock_fname);
552 unlink(ap_lock_fname);
555 static void accept_mutex_on(void)
559 while ((ret = fcntl(lock_fd, F_SETLKW, &lock_it)) < 0 && errno == EINTR) {
564 ap_log_error(APLOG_MARK, APLOG_EMERG, errno, server_conf,
565 "fcntl: F_SETLKW: Error getting accept lock, exiting! "
566 "Perhaps you need to use the LockFile directive to place "
567 "your lock file on a local disk!");
568 clean_child_exit(APEXIT_CHILDFATAL);
572 static void accept_mutex_off(void)
576 while ((ret = fcntl(lock_fd, F_SETLKW, &unlock_it)) < 0 && errno == EINTR) {
580 ap_log_error(APLOG_MARK, APLOG_EMERG, errno, server_conf,
581 "fcntl: F_SETLKW: Error freeing accept lock, exiting! "
582 "Perhaps you need to use the LockFile directive to place "
583 "your lock file on a local disk!");
584 clean_child_exit(APEXIT_CHILDFATAL);
588 #elif defined(USE_FLOCK_SERIALIZED_ACCEPT)
590 static int lock_fd = -1;
592 static ap_status_t accept_mutex_cleanup(void *foo)
594 unlink(ap_lock_fname);
600 * Initialize mutex lock.
601 * Done by each child at it's birth
603 static void accept_mutex_child_init(ap_context_t *p)
607 ap_open(&tempfile, ap_lock_fname, APR_WRITE, APR_UREAD|APR_UWRITE, p);
609 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
610 "Child cannot open lock file: %s", ap_lock_fname);
611 clean_child_exit(APEXIT_CHILDINIT);
613 ap_get_os_file(&lock_fd, tempfile);
617 * Initialize mutex lock.
618 * Must be safe to call this on a restart.
620 static void accept_mutex_init(ap_context_t *p)
624 expand_lock_fname(p);
625 unlink(ap_lock_fname);
626 ap_open(&tempfile, ap_lock_fname, APR_CREATE|APR_WRITE|APR_EXCL,
627 APR_UREAD|APR_UWRITE, p);
629 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
630 "Parent cannot open lock file: %s", ap_lock_fname);
633 ap_get_os_file(&lock_fd, tempfile);
634 ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
637 static void accept_mutex_on(void)
641 while ((ret = flock(lock_fd, LOCK_EX)) < 0 && errno == EINTR)
645 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
646 "flock: LOCK_EX: Error getting accept lock. Exiting!");
647 clean_child_exit(APEXIT_CHILDFATAL);
651 static void accept_mutex_off(void)
653 if (flock(lock_fd, LOCK_UN) < 0) {
654 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
655 "flock: LOCK_UN: Error freeing accept lock. Exiting!");
656 clean_child_exit(APEXIT_CHILDFATAL);
660 #elif defined(USE_OS2SEM_SERIALIZED_ACCEPT)
662 static HMTX lock_sem = -1;
664 static void accept_mutex_cleanup(void *foo)
666 DosReleaseMutexSem(lock_sem);
667 DosCloseMutexSem(lock_sem);
671 * Initialize mutex lock.
672 * Done by each child at it's birth
674 static void accept_mutex_child_init(ap_context_t *p)
676 int rc = DosOpenMutexSem(NULL, &lock_sem);
679 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
680 "Child cannot open lock semaphore, rc=%d", rc);
681 clean_child_exit(APEXIT_CHILDINIT);
683 ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
688 * Initialize mutex lock.
689 * Must be safe to call this on a restart.
691 static void accept_mutex_init(ap_context_t *p)
693 int rc = DosCreateMutexSem(NULL, &lock_sem, DC_SEM_SHARED, FALSE);
696 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
697 "Parent cannot create lock semaphore, rc=%d", rc);
701 ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
704 static void accept_mutex_on(void)
706 int rc = DosRequestMutexSem(lock_sem, SEM_INDEFINITE_WAIT);
709 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
710 "OS2SEM: Error %d getting accept lock. Exiting!", rc);
711 clean_child_exit(APEXIT_CHILDFATAL);
715 static void accept_mutex_off(void)
717 int rc = DosReleaseMutexSem(lock_sem);
720 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
721 "OS2SEM: Error %d freeing accept lock. Exiting!", rc);
722 clean_child_exit(APEXIT_CHILDFATAL);
726 #elif defined(USE_TPF_CORE_SERIALIZED_ACCEPT)
728 static int tpf_core_held;
730 static void accept_mutex_cleanup(void *foo)
736 #define accept_mutex_init(x)
738 static void accept_mutex_child_init(ap_context_t *p)
740 ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
744 static void accept_mutex_on(void)
751 static void accept_mutex_off(void)
759 /* Default --- no serialization. Other methods *could* go here,
762 #if !defined(MULTITHREAD)
763 /* Multithreaded systems don't complete between processes for
765 #define NO_SERIALIZED_ACCEPT
766 #define accept_mutex_child_init(x)
767 #define accept_mutex_init(x)
768 #define accept_mutex_on()
769 #define accept_mutex_off()
773 /* On some architectures it's safe to do unserialized accept()s in the single
774 * Listen case. But it's never safe to do it in the case where there's
775 * multiple Listen statements. Define SINGLE_LISTEN_UNSERIALIZED_ACCEPT
776 * when it's safe in the single Listen case.
778 #ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
779 #define SAFE_ACCEPT(stmt) do {if (ap_listeners->next) {stmt;}} while(0)
781 #define SAFE_ACCEPT(stmt) do {stmt;} while(0)
785 /*****************************************************************
786 * dealing with other children
789 #ifdef HAS_OTHER_CHILD
790 API_EXPORT(void) ap_register_other_child(int pid,
791 void (*maintenance) (int reason, void *, ap_wait_t status),
792 void *data, int write_fd)
794 other_child_rec *ocr;
796 ocr = ap_palloc(pconf, sizeof(*ocr));
798 ocr->maintenance = maintenance;
800 ocr->write_fd = write_fd;
801 ocr->next = other_children;
802 other_children = ocr;
805 /* note that since this can be called by a maintenance function while we're
806 * scanning the other_children list, all scanners should protect themself
807 * by loading ocr->next before calling any maintenance function.
809 API_EXPORT(void) ap_unregister_other_child(void *data)
811 other_child_rec **pocr, *nocr;
813 for (pocr = &other_children; *pocr; pocr = &(*pocr)->next) {
814 if ((*pocr)->data == data) {
815 nocr = (*pocr)->next;
816 (*(*pocr)->maintenance) (OC_REASON_UNREGISTER, (*pocr)->data, -1);
818 /* XXX: um, well we've just wasted some space in pconf ? */
824 /* test to ensure that the write_fds are all still writable, otherwise
825 * invoke the maintenance functions as appropriate */
826 static void probe_writable_fds(void)
830 other_child_rec *ocr, *nocr;
834 if (other_children == NULL)
838 FD_ZERO(&writable_fds);
840 for (ocr = other_children; ocr; ocr = ocr->next) {
841 if (ocr->write_fd == -1)
843 FD_SET(ocr->write_fd, &writable_fds);
844 if (ocr->write_fd > fd_max) {
845 fd_max = ocr->write_fd;
853 rc = ap_select(fd_max + 1, NULL, &writable_fds, NULL, &tv);
854 } while (rc == -1 && errno == EINTR);
857 /* XXX: uhh this could be really bad, we could have a bad file
858 * descriptor due to a bug in one of the maintenance routines */
859 ap_log_unixerr("probe_writable_fds", "select",
860 "could not probe writable fds", server_conf);
866 for (ocr = other_children; ocr; ocr = nocr) {
868 if (ocr->write_fd == -1)
870 if (FD_ISSET(ocr->write_fd, &writable_fds))
872 (*ocr->maintenance) (OC_REASON_UNWRITABLE, ocr->data, -1);
876 /* possibly reap an other_child, return 0 if yes, -1 if not */
877 static int reap_other_child(int pid, ap_wait_t status)
879 other_child_rec *ocr, *nocr;
881 for (ocr = other_children; ocr; ocr = nocr) {
886 (*ocr->maintenance) (OC_REASON_DEATH, ocr->data, status);
893 /*****************************************************************
895 * Dealing with the scoreboard... a lot of these variables are global
896 * only to avoid getting clobbered by the longjmp() that happens when
897 * a hard timeout expires...
899 * We begin with routines which deal with the file itself...
902 #if defined(USE_OS2_SCOREBOARD)
904 /* The next two routines are used to access shared memory under OS/2. */
905 /* This requires EMX v09c to be installed. */
907 caddr_t create_shared_heap(const char *name, size_t size)
913 rc = DosAllocSharedMem(&mem, name, size,
914 PAG_COMMIT | PAG_READ | PAG_WRITE);
917 h = _ucreate(mem, size, !_BLOCK_CLEAN, _HEAP_REGULAR | _HEAP_SHARED,
924 caddr_t get_shared_heap(const char *Name)
927 PVOID BaseAddress; /* Pointer to the base address of
928 the shared memory object */
929 ULONG AttributeFlags; /* Flags describing characteristics
930 of the shared memory object */
931 APIRET rc; /* Return code */
933 /* Request read and write access to */
934 /* the shared memory object */
935 AttributeFlags = PAG_WRITE | PAG_READ;
937 rc = DosGetNamedSharedMem(&BaseAddress, Name, AttributeFlags);
940 printf("DosGetNamedSharedMem error: return code = %ld", rc);
947 static void setup_shared_mem(ap_context_t *p)
953 m = (caddr_t) create_shared_heap("\\SHAREMEM\\SCOREBOARD", SCOREBOARD_SIZE);
955 fprintf(stderr, "%s: Could not create OS/2 Shared memory pool.\n",
960 rc = _uopen((Heap_t) m);
963 "%s: Could not uopen() newly created OS/2 Shared memory pool.\n",
966 ap_scoreboard_image = (scoreboard *) m;
967 ap_scoreboard_image->global.running_generation = 0;
970 static void reopen_scoreboard(ap_context_t *p)
975 m = (caddr_t) get_shared_heap("\\SHAREMEM\\SCOREBOARD");
977 fprintf(stderr, "%s: Could not find existing OS/2 Shared memory pool.\n",
982 rc = _uopen((Heap_t) m);
983 ap_scoreboard_image = (scoreboard *) m;
986 #elif defined(USE_POSIX_SCOREBOARD)
987 #include <sys/mman.h>
992 * As of version 4.23A, shared memory in QNX must reside under /dev/shmem,
993 * where no subdirectories allowed.
995 * POSIX shm_open() and shm_unlink() will take care about this issue,
996 * but to avoid confusion, I suggest to redefine scoreboard file name
997 * in httpd.conf to cut "logs/" from it. With default setup actual name
998 * will be "/dev/shmem/logs.apache_status".
1000 * If something went wrong and Apache did not unlinked this object upon
1001 * exit, you can remove it manually, using "rm -f" command.
1004 * <sys/mman.h> in QNX defines MAP_ANON, but current implementation
1005 * does NOT support BSD style anonymous mapping. So, the order of
1006 * conditional compilation is important:
1007 * this #ifdef section must be ABOVE the next one (BSD style).
1009 * I tested this stuff and it works fine for me, but if it provides
1010 * trouble for you, just comment out USE_MMAP_SCOREBOARD in QNX section
1014 * Igor N. Kovalenko -- infoh@mail.wplus.net
1017 static void cleanup_shared_mem(void *d)
1019 shm_unlink(ap_scoreboard_fname);
1022 static void setup_shared_mem(ap_context_t *p)
1028 fd = shm_open(ap_scoreboard_fname, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
1030 ap_snprintf(buf, sizeof(buf), "%s: could not open(create) scoreboard",
1035 if (ltrunc(fd, (off_t) SCOREBOARD_SIZE, SEEK_SET) == -1) {
1036 ap_snprintf(buf, sizeof(buf), "%s: could not ltrunc scoreboard",
1039 shm_unlink(ap_scoreboard_fname);
1042 if ((m = (caddr_t) mmap((caddr_t) 0,
1043 (size_t) SCOREBOARD_SIZE, PROT_READ | PROT_WRITE,
1044 MAP_SHARED, fd, (off_t) 0)) == (caddr_t) - 1) {
1045 ap_snprintf(buf, sizeof(buf), "%s: cannot mmap scoreboard",
1048 shm_unlink(ap_scoreboard_fname);
1052 ap_register_cleanup(p, NULL, cleanup_shared_mem, ap_null_cleanup);
1053 ap_scoreboard_image = (scoreboard *) m;
1054 ap_scoreboard_image->global.running_generation = 0;
1057 static void reopen_scoreboard(ap_context_t *p)
1061 #elif defined(USE_MMAP_SCOREBOARD)
1063 static void setup_shared_mem(ap_context_t *p)
1067 #if defined(MAP_ANON)
1071 * 9-Aug-97 - Jeff Venters (venters@convex.hp.com)
1072 * ConvexOS maps address space as follows:
1073 * 0x00000000 - 0x7fffffff : Kernel
1074 * 0x80000000 - 0xffffffff : User
1075 * Start mmapped area 1GB above start of text.
1077 * Also, the length requires a pointer as the actual length is
1078 * returned (rounded up to a page boundary).
1081 unsigned len = SCOREBOARD_SIZE;
1083 m = mmap((caddr_t) 0xC0000000, &len,
1084 PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, NOFD, 0);
1086 #elif defined(MAP_TMPFILE)
1088 char mfile[] = "/tmp/apache_shmem_XXXX";
1089 int fd = mkstemp(mfile);
1092 fprintf(stderr, "%s: Could not open %s\n", ap_server_argv0, mfile);
1095 m = mmap((caddr_t) 0, SCOREBOARD_SIZE,
1096 PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
1097 if (m == (caddr_t) - 1) {
1099 fprintf(stderr, "%s: Could not mmap %s\n", ap_server_argv0, mfile);
1106 m = mmap((caddr_t) 0, SCOREBOARD_SIZE,
1107 PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0);
1109 if (m == (caddr_t) - 1) {
1111 fprintf(stderr, "%s: Could not mmap memory\n", ap_server_argv0);
1118 fd = open("/dev/zero", O_RDWR);
1121 fprintf(stderr, "%s: Could not open /dev/zero\n", ap_server_argv0);
1124 m = mmap((caddr_t) 0, SCOREBOARD_SIZE,
1125 PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
1126 if (m == (caddr_t) - 1) {
1128 fprintf(stderr, "%s: Could not mmap /dev/zero\n", ap_server_argv0);
1133 ap_scoreboard_image = (scoreboard *) m;
1134 ap_scoreboard_image->global.running_generation = 0;
1137 static void reopen_scoreboard(ap_context_t *p)
1141 #elif defined(USE_SHMGET_SCOREBOARD)
1142 static key_t shmkey = IPC_PRIVATE;
1143 static int shmid = -1;
1145 static void setup_shared_mem(ap_context_t *p)
1147 struct shmid_ds shmbuf;
1152 if ((shmid = shmget(shmkey, SCOREBOARD_SIZE, IPC_CREAT | SHM_R | SHM_W)) == -1) {
1154 if (errno == ENOSYS) {
1155 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, 0, server_conf,
1156 "Your kernel was built without CONFIG_SYSVIPC\n"
1157 "%s: Please consult the Apache FAQ for details",
1161 ap_log_error(APLOG_MARK, APLOG_EMERG, errno, server_conf,
1162 "could not call shmget");
1166 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, server_conf,
1167 "created shared memory segment #%d", shmid);
1171 * Some SysV systems place the shared segment WAY too close
1172 * to the dynamic memory break point (sbrk(0)). This severely
1173 * limits the use of malloc/sbrk in the program since sbrk will
1174 * refuse to move past that point.
1176 * To get around this, we move the break point "way up there",
1177 * attach the segment and then move break back down. Ugly
1179 if ((obrk = sbrk(MOVEBREAK)) == (char *) -1) {
1180 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
1181 "sbrk() could not move break");
1185 #define BADSHMAT ((scoreboard *)(-1))
1186 if ((ap_scoreboard_image = (scoreboard *) shmat(shmid, 0, 0)) == BADSHMAT) {
1187 ap_log_error(APLOG_MARK, APLOG_EMERG, errno, server_conf, "shmat error");
1189 * We exit below, after we try to remove the segment
1192 else { /* only worry about permissions if we attached the segment */
1193 if (shmctl(shmid, IPC_STAT, &shmbuf) != 0) {
1194 ap_log_error(APLOG_MARK, APLOG_ERR, errno, server_conf,
1195 "shmctl() could not stat segment #%d", shmid);
1198 shmbuf.shm_perm.uid = unixd_config.user_id;
1199 shmbuf.shm_perm.gid = unixd_config.group_id;
1200 if (shmctl(shmid, IPC_SET, &shmbuf) != 0) {
1201 ap_log_error(APLOG_MARK, APLOG_ERR, errno, server_conf,
1202 "shmctl() could not set segment #%d", shmid);
1207 * We must avoid leaving segments in the kernel's
1210 if (shmctl(shmid, IPC_RMID, NULL) != 0) {
1211 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf,
1212 "shmctl: IPC_RMID: could not remove shared memory segment #%d",
1215 if (ap_scoreboard_image == BADSHMAT) /* now bailout */
1219 if (obrk == (char *) -1)
1220 return; /* nothing else to do */
1221 if (sbrk(-(MOVEBREAK)) == (char *) -1) {
1222 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
1223 "sbrk() could not move break back");
1226 ap_scoreboard_image->global.running_generation = 0;
1229 static void reopen_scoreboard(ap_context_t *p)
1233 #elif defined(USE_TPF_SCOREBOARD)
1235 static void cleanup_scoreboard_heap()
1238 rv = rsysc(ap_scoreboard_image, SCOREBOARD_FRAMES, SCOREBOARD_NAME);
1239 if(rv == RSYSC_ERROR) {
1240 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
1241 "rsysc() could not release scoreboard system heap");
1245 static void setup_shared_mem(ap_context_t *p)
1247 cinfc(CINFC_WRITE, CINFC_CMMCTK2);
1248 ap_scoreboard_image = (scoreboard *) gsysc(SCOREBOARD_FRAMES, SCOREBOARD_NAME);
1250 if (!ap_scoreboard_image) {
1251 fprintf(stderr, "httpd: Could not create scoreboard system heap storage.\n");
1255 ap_register_cleanup(p, NULL, cleanup_scoreboard_heap, ap_null_cleanup);
1256 ap_scoreboard_image->global.running_generation = 0;
1259 static void reopen_scoreboard(ap_context_t *p)
1261 cinfc(CINFC_WRITE, CINFC_CMMCTK2);
1265 #define SCOREBOARD_FILE
1266 static scoreboard _scoreboard_image;
1267 static int scoreboard_fd = -1;
1269 /* XXX: things are seriously screwed if we ever have to do a partial
1270 * read or write ... we could get a corrupted scoreboard
1272 static int force_write(int fd, void *buffer, int bufsz)
1274 int rv, orig_sz = bufsz;
1277 rv = write(fd, buffer, bufsz);
1279 buffer = (char *) buffer + rv;
1282 } while ((rv > 0 && bufsz > 0) || (rv == -1 && errno == EINTR));
1284 return rv < 0 ? rv : orig_sz - bufsz;
1287 static int force_read(int fd, void *buffer, int bufsz)
1289 int rv, orig_sz = bufsz;
1292 rv = read(fd, buffer, bufsz);
1294 buffer = (char *) buffer + rv;
1297 } while ((rv > 0 && bufsz > 0) || (rv == -1 && errno == EINTR));
1299 return rv < 0 ? rv : orig_sz - bufsz;
1302 static void cleanup_scoreboard_file(void *foo)
1304 unlink(ap_scoreboard_fname);
1307 void reopen_scoreboard(ap_context_t *p)
1309 if (scoreboard_fd != -1)
1310 ap_pclosef(p, scoreboard_fd);
1313 ap_scoreboard_fname = ap_server_root_relative(p, ap_scoreboard_fname);
1315 scoreboard_fd = ap_popenf(p, ap_scoreboard_fname, O_CREAT | O_BINARY | O_RDWR, 0666);
1316 if (scoreboard_fd == -1) {
1317 perror(ap_scoreboard_fname);
1318 fprintf(stderr, "Cannot open scoreboard file:\n");
1319 clean_child_exit(1);
1324 /* Called by parent process */
1325 static void reinit_scoreboard(ap_context_t *p)
1327 int running_gen = 0;
1328 if (ap_scoreboard_image)
1329 running_gen = ap_scoreboard_image->global.running_generation;
1331 #ifndef SCOREBOARD_FILE
1332 if (ap_scoreboard_image == NULL) {
1333 setup_shared_mem(p);
1335 memset(ap_scoreboard_image, 0, SCOREBOARD_SIZE);
1336 ap_scoreboard_image->global.running_generation = running_gen;
1338 ap_scoreboard_image = &_scoreboard_image;
1339 ap_scoreboard_fname = ap_server_root_relative(p, ap_scoreboard_fname);
1341 scoreboard_fd = ap_popenf(p, ap_scoreboard_fname, O_CREAT | O_BINARY | O_RDWR, 0644);
1342 if (scoreboard_fd == -1) {
1343 perror(ap_scoreboard_fname);
1344 fprintf(stderr, "Cannot open scoreboard file:\n");
1347 ap_register_cleanup(p, NULL, cleanup_scoreboard_file, ap_null_cleanup);
1349 memset((char *) ap_scoreboard_image, 0, sizeof(*ap_scoreboard_image));
1350 ap_scoreboard_image->global.running_generation = running_gen;
1351 force_write(scoreboard_fd, ap_scoreboard_image, sizeof(*ap_scoreboard_image));
1355 /* Routines called to deal with the scoreboard image
1356 * --- note that we do *not* need write locks, since update_child_status
1357 * only updates a *single* record in place, and only one process writes to
1358 * a given scoreboard slot at a time (either the child process owning that
1359 * slot, or the parent, noting that the child has died).
1361 * As a final note --- setting the score entry to getpid() is always safe,
1362 * since when the parent is writing an entry, it's only noting SERVER_DEAD
1366 ap_inline void ap_sync_scoreboard_image(void)
1368 #ifdef SCOREBOARD_FILE
1369 lseek(scoreboard_fd, 0L, 0);
1370 force_read(scoreboard_fd, ap_scoreboard_image, sizeof(*ap_scoreboard_image));
1374 API_EXPORT(int) ap_exists_scoreboard_image(void)
1376 return (ap_scoreboard_image ? 1 : 0);
1379 static ap_inline void put_scoreboard_info(int child_num,
1380 short_score *new_score_rec)
1382 #ifdef SCOREBOARD_FILE
1383 lseek(scoreboard_fd, (long) child_num * sizeof(short_score), 0);
1384 force_write(scoreboard_fd, new_score_rec, sizeof(short_score));
1388 int ap_update_child_status(int child_num, int status, request_rec *r)
1398 ap_sync_scoreboard_image();
1399 ss = &ap_scoreboard_image->servers[child_num];
1400 old_status = ss->status;
1401 ss->status = status;
1403 if (ap_extended_status) {
1404 if (status == SERVER_READY || status == SERVER_DEAD) {
1406 * Reset individual counters
1408 if (status == SERVER_DEAD) {
1409 ss->my_access_count = 0L;
1410 ss->my_bytes_served = 0L;
1412 ss->conn_count = (unsigned short) 0;
1413 ss->conn_bytes = (unsigned long) 0;
1416 conn_rec *c = r->connection;
1417 ap_cpystrn(ss->client, ap_get_remote_host(c, r->per_dir_config,
1418 REMOTE_NOLOOKUP), sizeof(ss->client));
1419 if (r->the_request == NULL) {
1420 ap_cpystrn(ss->request, "NULL", sizeof(ss->request));
1421 } else if (r->parsed_uri.password == NULL) {
1422 ap_cpystrn(ss->request, r->the_request, sizeof(ss->request));
1424 /* Don't reveal the password in the server-status view */
1425 ap_cpystrn(ss->request, ap_pstrcat(r->pool, r->method, " ",
1426 ap_unparse_uri_components(r->pool, &r->parsed_uri, UNP_OMITPASSWORD),
1427 r->assbackwards ? NULL : " ", r->protocol, NULL),
1428 sizeof(ss->request));
1430 ss->vhostrec = r->server;
1433 if (status == SERVER_STARTING && r == NULL) {
1434 /* clean up the slot's vhostrec pointer (maybe re-used)
1435 * and mark the slot as belonging to a new generation.
1437 ss->vhostrec = NULL;
1438 ap_scoreboard_image->parent[child_num].generation = ap_my_generation;
1439 #ifdef SCOREBOARD_FILE
1440 lseek(scoreboard_fd, XtOffsetOf(scoreboard, parent[child_num]), 0);
1441 force_write(scoreboard_fd, &ap_scoreboard_image->parent[child_num],
1442 sizeof(parent_score));
1445 put_scoreboard_info(child_num, ss);
1450 static void update_scoreboard_global(void)
1452 #ifdef SCOREBOARD_FILE
1453 lseek(scoreboard_fd,
1454 (char *) &ap_scoreboard_image->global -(char *) ap_scoreboard_image, 0);
1455 force_write(scoreboard_fd, &ap_scoreboard_image->global,
1456 sizeof ap_scoreboard_image->global);
1460 void ap_time_process_request(int child_num, int status)
1463 #if defined(NO_GETTIMEOFDAY) && !defined(NO_TIMES)
1470 ap_sync_scoreboard_image();
1471 ss = &ap_scoreboard_image->servers[child_num];
1473 if (status == START_PREQUEST) {
1474 #if defined(NO_GETTIMEOFDAY)
1476 if ((ss->start_time = times(&tms_blk)) == -1)
1477 #endif /* NO_TIMES */
1478 ss->start_time = (clock_t) 0;
1480 if (gettimeofday(&ss->start_time, (struct timezone *) 0) < 0)
1481 ss->start_time.tv_sec =
1482 ss->start_time.tv_usec = 0L;
1485 else if (status == STOP_PREQUEST) {
1486 #if defined(NO_GETTIMEOFDAY)
1488 if ((ss->stop_time = times(&tms_blk)) == -1)
1490 ss->stop_time = ss->start_time = (clock_t) 0;
1492 if (gettimeofday(&ss->stop_time, (struct timezone *) 0) < 0)
1493 ss->stop_time.tv_sec =
1494 ss->stop_time.tv_usec =
1495 ss->start_time.tv_sec =
1496 ss->start_time.tv_usec = 0L;
1501 put_scoreboard_info(child_num, ss);
1505 static void increment_counts(int child_num, request_rec *r)
1510 ap_sync_scoreboard_image();
1511 ss = &ap_scoreboard_image->servers[child_num];
1514 ap_bgetopt(r->connection->client, BO_BYTECT, &bs);
1520 ss->my_access_count++;
1522 ss->bytes_served += (unsigned long) bs;
1523 ss->my_bytes_served += (unsigned long) bs;
1524 ss->conn_bytes += (unsigned long) bs;
1526 put_scoreboard_info(child_num, ss);
1530 static int find_child_by_pid(int pid)
1534 for (i = 0; i < max_daemons_limit; ++i)
1535 if (ap_scoreboard_image->parent[i].pid == pid)
1541 static void reclaim_child_processes(int terminate)
1545 long int waittime = 1024 * 16; /* in usecs */
1549 #ifdef HAS_OTHER_CHILD
1550 other_child_rec *ocr, *nocr;
1553 ap_sync_scoreboard_image();
1555 for (tries = terminate ? 4 : 1; tries <= 9; ++tries) {
1556 /* don't want to hold up progress any more than
1557 * necessary, but we need to allow children a few moments to exit.
1558 * Set delay with an exponential backoff.
1560 tv.tv_sec = waittime / 1000000;
1561 tv.tv_usec = waittime % 1000000;
1562 waittime = waittime * 4;
1563 ap_select(0, NULL, NULL, NULL, &tv);
1565 /* now see who is done */
1567 for (i = 0; i < max_daemons_limit; ++i) {
1568 int pid = ap_scoreboard_image->parent[i].pid;
1570 if (pid == my_pid || pid == 0)
1573 waitret = waitpid(pid, &status, WNOHANG);
1574 if (waitret == pid || waitret == -1) {
1575 ap_scoreboard_image->parent[i].pid = 0;
1584 /* perhaps it missed the SIGHUP, lets try again */
1585 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
1587 "child process %d did not exit, sending another SIGHUP",
1590 waittime = 1024 * 16;
1596 case 7: /* 1.4sec */
1597 /* ok, now it's being annoying */
1598 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
1600 "child process %d still did not exit, sending a SIGTERM",
1605 /* die child scum */
1606 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, server_conf,
1607 "child process %d still did not exit, sending a SIGKILL",
1611 case 9: /* 14 sec */
1612 /* gave it our best shot, but alas... If this really
1613 * is a child we are trying to kill and it really hasn't
1614 * exited, we will likely fail to bind to the port
1615 * after the restart.
1617 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, server_conf,
1618 "could not make child process %d exit, "
1619 "attempting to continue anyway", pid);
1623 #ifdef HAS_OTHER_CHILD
1624 for (ocr = other_children; ocr; ocr = nocr) {
1629 waitret = waitpid(ocr->pid, &status, WNOHANG);
1630 if (waitret == ocr->pid) {
1632 (*ocr->maintenance) (OC_REASON_DEATH, ocr->data, status);
1634 else if (waitret == 0) {
1635 (*ocr->maintenance) (OC_REASON_RESTART, ocr->data, -1);
1638 else if (waitret == -1) {
1639 /* uh what the heck? they didn't call unregister? */
1641 (*ocr->maintenance) (OC_REASON_LOST, ocr->data, -1);
1645 if (!not_dead_yet) {
1646 /* nothing left to wait for */
1650 #endif /* ndef MULTITHREAD */
1654 #if defined(NEED_WAITPID)
1656 Systems without a real waitpid sometimes lose a child's exit while waiting
1657 for another. Search through the scoreboard for missing children.
1659 int reap_children(ap_wait_t *status)
1663 for (n = 0; n < max_daemons_limit; ++n) {
1664 ap_sync_scoreboard_image();
1665 if (ap_scoreboard_image->servers[n].status != SERVER_DEAD &&
1666 kill((pid = ap_scoreboard_image->parent[n].pid), 0) == -1) {
1667 ap_update_child_status(n, SERVER_DEAD, NULL);
1668 /* just mark it as having a successful exit status */
1669 bzero((char *) status, sizeof(ap_wait_t));
1677 /* Finally, this routine is used by the caretaker process to wait for
1681 /* number of calls to wait_or_timeout between writable probes */
1682 #ifndef INTERVAL_OF_WRITABLE_PROBES
1683 #define INTERVAL_OF_WRITABLE_PROBES 10
1685 static int wait_or_timeout_counter;
1687 static int wait_or_timeout(ap_wait_t *status)
1692 ++wait_or_timeout_counter;
1693 if (wait_or_timeout_counter == INTERVAL_OF_WRITABLE_PROBES) {
1694 wait_or_timeout_counter = 0;
1695 #ifdef HAS_OTHER_CHILD
1696 probe_writable_fds();
1699 ret = waitpid(-1, status, WNOHANG);
1700 if (ret == -1 && errno == EINTR) {
1707 if ((ret = reap_children(status)) > 0) {
1711 tv.tv_sec = SCOREBOARD_MAINTENANCE_INTERVAL / 1000000;
1712 tv.tv_usec = SCOREBOARD_MAINTENANCE_INTERVAL % 1000000;
1713 ap_select(0, NULL, NULL, NULL, &tv);
1717 /* handle all varieties of core dumping signals */
1718 static void sig_coredump(int sig)
1720 chdir(ap_coredump_dir);
1721 signal(sig, SIG_DFL);
1722 kill(getpid(), sig);
1723 /* At this point we've got sig blocked, because we're still inside
1724 * the signal handler. When we leave the signal handler it will
1725 * be unblocked, and we'll take the signal... and coredump or whatever
1726 * is appropriate for this particular Unix. In addition the parent
1727 * will see the real signal we received -- whereas if we called
1728 * abort() here, the parent would only see SIGABRT.
1732 /*****************************************************************
1733 * Connection structures and accounting...
1736 static void just_die(int sig)
1738 clean_child_exit(0);
1741 static int volatile deferred_die;
1742 static int volatile usr1_just_die;
1744 static void usr1_handler(int sig)
1746 if (usr1_just_die) {
1752 /* volatile just in case */
1753 static int volatile shutdown_pending;
1754 static int volatile restart_pending;
1755 static int volatile is_graceful;
1756 ap_generation_t volatile ap_my_generation=0;
1758 static void sig_term(int sig)
1760 if (shutdown_pending == 1) {
1761 /* Um, is this _probably_ not an error, if the user has
1762 * tried to do a shutdown twice quickly, so we won't
1763 * worry about reporting it.
1767 shutdown_pending = 1;
1770 static void restart(int sig)
1772 if (restart_pending == 1) {
1773 /* Probably not an error - don't bother reporting it */
1776 restart_pending = 1;
1777 is_graceful = sig == SIGUSR1;
1780 static void set_signals(void)
1782 #ifndef NO_USE_SIGACTION
1783 struct sigaction sa;
1785 sigemptyset(&sa.sa_mask);
1789 sa.sa_handler = sig_coredump;
1790 #if defined(SA_ONESHOT)
1791 sa.sa_flags = SA_ONESHOT;
1792 #elif defined(SA_RESETHAND)
1793 sa.sa_flags = SA_RESETHAND;
1795 if (sigaction(SIGSEGV, &sa, NULL) < 0)
1796 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGSEGV)");
1798 if (sigaction(SIGBUS, &sa, NULL) < 0)
1799 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGBUS)");
1802 if (sigaction(SIGABORT, &sa, NULL) < 0)
1803 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGABORT)");
1806 if (sigaction(SIGABRT, &sa, NULL) < 0)
1807 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGABRT)");
1810 if (sigaction(SIGILL, &sa, NULL) < 0)
1811 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGILL)");
1815 sa.sa_handler = sig_term;
1816 if (sigaction(SIGTERM, &sa, NULL) < 0)
1817 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGTERM)");
1819 if (sigaction(SIGINT, &sa, NULL) < 0)
1820 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGINT)");
1823 sa.sa_handler = SIG_DFL;
1824 if (sigaction(SIGXCPU, &sa, NULL) < 0)
1825 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGXCPU)");
1828 sa.sa_handler = SIG_DFL;
1829 if (sigaction(SIGXFSZ, &sa, NULL) < 0)
1830 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGXFSZ)");
1833 sa.sa_handler = SIG_IGN;
1834 if (sigaction(SIGPIPE, &sa, NULL) < 0)
1835 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGPIPE)");
1838 /* we want to ignore HUPs and USR1 while we're busy processing one */
1839 sigaddset(&sa.sa_mask, SIGHUP);
1840 sigaddset(&sa.sa_mask, SIGUSR1);
1841 sa.sa_handler = restart;
1842 if (sigaction(SIGHUP, &sa, NULL) < 0)
1843 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGHUP)");
1844 if (sigaction(SIGUSR1, &sa, NULL) < 0)
1845 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGUSR1)");
1848 signal(SIGSEGV, sig_coredump);
1850 signal(SIGBUS, sig_coredump);
1853 signal(SIGABORT, sig_coredump);
1854 #endif /* SIGABORT */
1856 signal(SIGABRT, sig_coredump);
1857 #endif /* SIGABRT */
1859 signal(SIGILL, sig_coredump);
1862 signal(SIGXCPU, SIG_DFL);
1863 #endif /* SIGXCPU */
1865 signal(SIGXFSZ, SIG_DFL);
1866 #endif /* SIGXFSZ */
1869 signal(SIGTERM, sig_term);
1871 signal(SIGHUP, restart);
1874 signal(SIGUSR1, restart);
1875 #endif /* SIGUSR1 */
1877 signal(SIGPIPE, SIG_IGN);
1878 #endif /* SIGPIPE */
1883 #if defined(TCP_NODELAY) && !defined(MPE) && !defined(TPF)
1884 static void sock_disable_nagle(int s)
1886 /* The Nagle algorithm says that we should delay sending partial
1887 * packets in hopes of getting more data. We don't want to do
1888 * this; we are not telnet. There are bad interactions between
1889 * persistent connections and Nagle's algorithm that have very severe
1890 * performance penalties. (Failing to disable Nagle is not much of a
1891 * problem with simple HTTP.)
1893 * In spite of these problems, failure here is not a shooting offense.
1895 int just_say_no = 1;
1897 if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (char *) &just_say_no,
1899 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf,
1900 "setsockopt: (TCP_NODELAY)");
1905 #define sock_disable_nagle(s) /* NOOP */
1909 /*****************************************************************
1910 * Child process main loop.
1911 * The following vars are static to avoid getting clobbered by longjmp();
1912 * they are really private to child_main.
1916 static ap_socket_t *csd;
1917 static int requests_this_child;
1918 static fd_set main_fds;
1920 API_EXPORT(void) ap_child_terminate(request_rec *r)
1922 r->connection->keepalive = 0;
1923 requests_this_child = ap_max_requests_per_child = 1;
1926 int ap_graceful_stop_signalled(void)
1928 ap_sync_scoreboard_image();
1930 ap_scoreboard_image->global.running_generation != ap_my_generation) {
1936 static void child_main(int child_num_arg)
1939 struct sockaddr sa_server;
1940 struct sockaddr sa_client;
1942 ap_listen_rec *last_lr;
1943 ap_listen_rec *first_lr;
1944 ap_context_t *ptrans;
1945 conn_rec *current_conn;
1952 my_child_num = child_num_arg;
1953 requests_this_child = 0;
1956 /* Get a sub context for global allocations in this child, so that
1957 * we can have cleanups occur when the child exits.
1959 ap_create_context(&pchild, pconf);
1961 ap_create_context(&ptrans, pchild);
1963 /* needs to be done before we switch UIDs so we have permissions */
1964 reopen_scoreboard(pchild);
1965 SAFE_ACCEPT(accept_mutex_child_init(pchild));
1967 if (unixd_setup_child()) {
1968 clean_child_exit(APEXIT_CHILDFATAL);
1971 ap_child_init_hook(pchild, server_conf);
1973 (void) ap_update_child_status(my_child_num, SERVER_READY, (request_rec *) NULL);
1975 signal(SIGHUP, just_die);
1976 signal(SIGTERM, just_die);
1979 /* Stop Ctrl-C/Ctrl-Break signals going to child processes */
1981 unsigned long ulTimes;
1982 DosSetSignalExceptionFocus(0, &ulTimes);
1986 while (!ap_graceful_stop_signalled()) {
1989 /* Prepare to receive a SIGUSR1 due to graceful restart so that
1990 * we can exit cleanly.
1993 signal(SIGUSR1, usr1_handler);
1996 * (Re)initialize this child to a pre-connection state.
1999 current_conn = NULL;
2001 ap_clear_pool(ptrans);
2003 if ((ap_max_requests_per_child > 0
2004 && requests_this_child++ >= ap_max_requests_per_child)) {
2005 clean_child_exit(0);
2008 (void) ap_update_child_status(my_child_num, SERVER_READY, (request_rec *) NULL);
2011 * Wait for an acceptable connection to arrive.
2014 /* Lock around "accept", if necessary */
2015 SAFE_ACCEPT(accept_mutex_on());
2018 if (ap_listeners->next) {
2019 /* more than one socket */
2020 memcpy(&main_fds, &listenfds, sizeof(fd_set));
2021 srv = ap_select(listenmaxfd + 1, &main_fds, NULL, NULL, NULL);
2023 if (srv < 0 && errno != EINTR) {
2024 /* Single Unix documents select as returning errnos
2025 * EBADF, EINTR, and EINVAL... and in none of those
2026 * cases does it make sense to continue. In fact
2027 * on Linux 2.0.x we seem to end up with EFAULT
2028 * occasionally, and we'd loop forever due to it.
2030 ap_log_error(APLOG_MARK, APLOG_ERR, errno, server_conf, "select: (listen)");
2031 clean_child_exit(1);
2037 /* we remember the last_lr we searched last time around so that
2038 we don't end up starving any particular listening socket */
2039 if (last_lr == NULL) {
2049 ap_get_os_sock(&sockdes, lr->sd);
2050 if (FD_ISSET(sockdes, &main_fds))
2056 while (lr != first_lr);
2057 /* FIXME: if we get here, something bad has happened, and we're
2058 probably gonna spin forever.
2066 /* only one socket, just pretend we did the other stuff */
2067 sd = ap_listeners->sd;
2070 /* if we accept() something we don't want to die, so we have to
2076 /* we didn't get a socket, and we were told to die */
2077 clean_child_exit(0);
2079 clen = sizeof(sa_client);
2080 stat = ap_accept(&csd, sd);
2081 if (stat == APR_SUCCESS || stat != APR_EINTR)
2085 if (stat == APR_SUCCESS)
2086 break; /* We have a socket ready for reading */
2089 /* TODO: this accept result handling stuff should be abstracted...
2090 * it's already out of date between the various unix mpms
2092 /* Our old behaviour here was to continue after accept()
2093 * errors. But this leads us into lots of troubles
2094 * because most of the errors are quite fatal. For
2095 * example, EMFILE can be caused by slow descriptor
2096 * leaks (say in a 3rd party module, or libc). It's
2097 * foolish for us to continue after an EMFILE. We also
2098 * seem to tickle kernel bugs on some platforms which
2099 * lead to never-ending loops here. So it seems best
2100 * to just exit in most cases.
2104 /* EPROTO on certain older kernels really means
2105 * ECONNABORTED, so we need to ignore it for them.
2106 * See discussion in new-httpd archives nh.9701
2107 * search for EPROTO.
2109 * Also see nh.9603, search for EPROTO:
2110 * There is potentially a bug in Solaris 2.x x<6,
2111 * and other boxes that implement tcp sockets in
2112 * userland (i.e. on top of STREAMS). On these
2113 * systems, EPROTO can actually result in a fatal
2114 * loop. See PR#981 for example. It's hard to
2115 * handle both uses of EPROTO.
2122 /* Linux generates the rest of these, other tcp
2123 * stacks (i.e. bsd) tend to hide them behind
2124 * getsockopt() interfaces. They occur when
2125 * the net goes sour or the client disconnects
2126 * after the three-way handshake has been done
2127 * in the kernel but before userland has picked
2146 * When the network layer has been shut down, there
2147 * is not much use in simply exiting: the parent
2148 * would simply re-create us (and we'd fail again).
2149 * Use the CHILDFATAL code to tear the server down.
2150 * @@@ Martin's idea for possible improvement:
2151 * A different approach would be to define
2152 * a new APEXIT_NETDOWN exit code, the reception
2153 * of which would make the parent shutdown all
2154 * children, then idle-loop until it detected that
2155 * the network is up again, and restart the children.
2156 * Ben Hyde noted that temporary ENETDOWN situations
2157 * occur in mobile IP.
2159 ap_log_error(APLOG_MARK, APLOG_EMERG, errno, server_conf,
2160 "accept: giving up.");
2161 clean_child_exit(APEXIT_CHILDFATAL);
2166 ap_log_error(APLOG_MARK, APLOG_EMERG, errno, server_conf,
2167 "offload device inactive");
2168 clean_child_exit(APEXIT_CHILDFATAL);
2171 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, server_conf,
2172 "select/accept error (%u)", errno);
2173 clean_child_exit(APEXIT_CHILDFATAL);
2176 ap_log_error(APLOG_MARK, APLOG_ERR, errno, server_conf,
2177 "accept: (client socket)");
2178 clean_child_exit(1);
2183 if (ap_graceful_stop_signalled()) {
2184 clean_child_exit(0);
2189 SAFE_ACCEPT(accept_mutex_off()); /* unlock after "accept" */
2192 if (csd == 0) /* 0 is invalid socket for TPF */
2196 /* We've got a socket, let's at least process one request off the
2197 * socket before we accept a graceful restart request. We set
2198 * the signal to ignore because we don't want to disturb any
2201 signal(SIGUSR1, SIG_IGN);
2204 * We now have a connection, so set it up with the appropriate
2205 * socket options, file descriptors, and read/write buffers.
2208 ap_get_os_sock(&sockdes, csd);
2210 clen = sizeof(sa_server);
2211 if (getsockname(sockdes, &sa_server, &clen) < 0) {
2212 ap_log_error(APLOG_MARK, APLOG_ERR, errno, server_conf, "getsockname");
2213 ap_close_socket(csd);
2217 sock_disable_nagle(sockdes);
2219 iol = unix_attach_socket(sockdes);
2221 if (errno == EBADF) {
2222 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, NULL,
2223 "filedescriptor (%u) larger than FD_SETSIZE (%u) "
2224 "found, you probably need to rebuild Apache with a "
2225 "larger FD_SETSIZE", sockdes, FD_SETSIZE);
2228 ap_log_error(APLOG_MARK, APLOG_WARNING, errno, NULL,
2229 "error attaching to socket");
2231 ap_close_socket(csd);
2235 (void) ap_update_child_status(my_child_num, SERVER_BUSY_READ,
2236 (request_rec *) NULL);
2238 conn_io = ap_bcreate(ptrans, B_RDWR);
2240 ap_bpush_iol(conn_io, iol);
2242 current_conn = ap_new_connection(ptrans, server_conf, conn_io,
2243 (struct sockaddr_in *) &sa_client,
2244 (struct sockaddr_in *) &sa_server,
2247 ap_process_connection(current_conn);
2252 static int make_child(server_rec *s, int slot, time_t now)
2256 if (slot + 1 > max_daemons_limit) {
2257 max_daemons_limit = slot + 1;
2261 signal(SIGHUP, just_die);
2262 signal(SIGINT, just_die);
2264 signal(SIGQUIT, SIG_DFL);
2266 signal(SIGTERM, just_die);
2270 (void) ap_update_child_status(slot, SERVER_STARTING, (request_rec *) NULL);
2274 /* BS2000 requires a "special" version of fork() before a setuid() call */
2275 if ((pid = os_fork(unixd_config.user_name)) == -1) {
2277 if ((pid = os_fork(s, slot)) == -1) {
2279 if ((pid = fork()) == -1) {
2281 ap_log_error(APLOG_MARK, APLOG_ERR, errno, s, "fork: Unable to fork new process");
2283 /* fork didn't succeed. Fix the scoreboard or else
2284 * it will say SERVER_STARTING forever and ever
2286 (void) ap_update_child_status(slot, SERVER_DEAD, (request_rec *) NULL);
2288 /* In case system resources are maxxed out, we don't want
2289 Apache running away with the CPU trying to fork over and
2290 over and over again. */
2297 #ifdef AIX_BIND_PROCESSOR
2298 /* by default AIX binds to a single processor
2299 * this bit unbinds children which will then bind to another cpu
2301 #include <sys/processor.h>
2302 int status = bindprocessor(BINDPROCESS, (int)getpid(),
2303 PROCESSOR_CLASS_ANY);
2305 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, server_conf,
2306 "processor unbind failed %d", status);
2309 RAISE_SIGSTOP(MAKE_CHILD);
2310 /* Disable the restart signal handlers and enable the just_die stuff.
2311 * Note that since restart() just notes that a restart has been
2312 * requested there's no race condition here.
2314 signal(SIGHUP, just_die);
2315 signal(SIGUSR1, just_die);
2316 signal(SIGTERM, just_die);
2320 ap_scoreboard_image->parent[slot].pid = pid;
2321 #ifdef SCOREBOARD_FILE
2322 lseek(scoreboard_fd, XtOffsetOf(scoreboard, parent[slot]), 0);
2323 force_write(scoreboard_fd, &ap_scoreboard_image->parent[slot],
2324 sizeof(parent_score));
2331 /* start up a bunch of children */
2332 static void startup_children(int number_to_start)
2335 time_t now = time(0);
2337 for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
2338 if (ap_scoreboard_image->servers[i].status != SERVER_DEAD) {
2341 if (make_child(server_conf, i, now) < 0) {
2350 * idle_spawn_rate is the number of children that will be spawned on the
2351 * next maintenance cycle if there aren't enough idle servers. It is
2352 * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
2353 * without the need to spawn.
2355 static int idle_spawn_rate = 1;
2356 #ifndef MAX_SPAWN_RATE
2357 #define MAX_SPAWN_RATE (32)
2359 static int hold_off_on_exponential_spawning;
2361 static void perform_idle_server_maintenance(void)
2367 time_t now = time(0);
2369 int free_slots[MAX_SPAWN_RATE];
2373 /* initialize the free_list */
2381 ap_sync_scoreboard_image();
2382 for (i = 0; i < ap_daemons_limit; ++i) {
2385 if (i >= max_daemons_limit && free_length == idle_spawn_rate)
2387 ss = &ap_scoreboard_image->servers[i];
2388 status = ss->status;
2389 if (status == SERVER_DEAD) {
2390 /* try to keep children numbers as low as possible */
2391 if (free_length < idle_spawn_rate) {
2392 free_slots[free_length] = i;
2397 /* We consider a starting server as idle because we started it
2398 * at least a cycle ago, and if it still hasn't finished starting
2399 * then we're just going to swamp things worse by forking more.
2400 * So we hopefully won't need to fork more if we count it.
2401 * This depends on the ordering of SERVER_READY and SERVER_STARTING.
2403 if (status <= SERVER_READY) {
2405 /* always kill the highest numbered child if we have to...
2406 * no really well thought out reason ... other than observing
2407 * the server behaviour under linux where lower numbered children
2408 * tend to service more hits (and hence are more likely to have
2409 * their data in cpu caches).
2418 max_daemons_limit = last_non_dead + 1;
2419 if (idle_count > ap_daemons_max_free) {
2420 /* kill off one child... we use SIGUSR1 because that'll cause it to
2421 * shut down gracefully, in case it happened to pick up a request
2422 * while we were counting
2424 kill(ap_scoreboard_image->parent[to_kill].pid, SIGUSR1);
2425 idle_spawn_rate = 1;
2427 else if (idle_count < ap_daemons_min_free) {
2428 /* terminate the free list */
2429 if (free_length == 0) {
2430 /* only report this condition once */
2431 static int reported = 0;
2434 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, server_conf,
2435 "server reached MaxClients setting, consider"
2436 " raising the MaxClients setting");
2439 idle_spawn_rate = 1;
2442 if (idle_spawn_rate >= 8) {
2443 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, server_conf,
2444 "server seems busy, (you may need "
2445 "to increase StartServers, or Min/MaxSpareServers), "
2446 "spawning %d children, there are %d idle, and "
2447 "%d total children", idle_spawn_rate,
2448 idle_count, total_non_dead);
2450 for (i = 0; i < free_length; ++i) {
2452 if(make_child(server_conf, free_slots[i], now) == -1) {
2453 if(free_length == 1) {
2454 shutdown_pending = 1;
2455 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
2456 "No active child processes: shutting down");
2460 make_child(server_conf, free_slots[i], now);
2463 /* the next time around we want to spawn twice as many if this
2464 * wasn't good enough, but not if we've just done a graceful
2466 if (hold_off_on_exponential_spawning) {
2467 --hold_off_on_exponential_spawning;
2469 else if (idle_spawn_rate < MAX_SPAWN_RATE) {
2470 idle_spawn_rate *= 2;
2475 idle_spawn_rate = 1;
2480 static void process_child_status(int pid, ap_wait_t status)
2482 /* Child died... if it died due to a fatal error,
2483 * we should simply bail out.
2485 if ((WIFEXITED(status)) &&
2486 WEXITSTATUS(status) == APEXIT_CHILDFATAL) {
2487 ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_NOERRNO, 0, server_conf,
2488 "Child %d returned a Fatal error... \n"
2489 "Apache is exiting!",
2491 exit(APEXIT_CHILDFATAL);
2493 if (WIFSIGNALED(status)) {
2494 switch (WTERMSIG(status)) {
2503 if (WCOREDUMP(status)) {
2504 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
2506 "child pid %d exit signal %s (%d), "
2507 "possible coredump in %s",
2508 pid, (WTERMSIG(status) >= NumSIG) ? "" :
2509 SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status),
2514 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
2516 "child pid %d exit signal %s (%d)", pid,
2517 SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status));
2522 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
2524 "child pid %d exit signal %d",
2525 pid, WTERMSIG(status));
2532 static int setup_listeners(server_rec *s)
2537 if (ap_listen_open(s->process, s->port)) {
2538 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, 0, s,
2539 "no listening sockets available, shutting down");
2544 FD_ZERO(&listenfds);
2545 for (lr = ap_listeners; lr; lr = lr->next) {
2546 ap_get_os_sock(&sockdes, lr->sd);
2547 FD_SET(sockdes, &listenfds);
2548 if (sockdes > listenmaxfd) {
2549 listenmaxfd = sockdes;
2556 /*****************************************************************
2557 * Executive routines.
2560 int ap_mpm_run(ap_context_t *_pconf, ap_context_t *plog, server_rec *s)
2562 int remaining_children_to_start;
2568 ap_log_pid(pconf, ap_pid_fname);
2570 if (setup_listeners(s)) {
2571 /* XXX: hey, what's the right way for the mpm to indicate a fatal error? */
2575 SAFE_ACCEPT(accept_mutex_init(pconf));
2577 reinit_scoreboard(pconf);
2579 #ifdef SCOREBOARD_FILE
2581 ap_scoreboard_fname = ap_server_root_relative(pconf, ap_scoreboard_fname);
2582 ap_note_cleanups_for_fd(pconf, scoreboard_fd);
2588 if (ap_daemons_max_free < ap_daemons_min_free + 1) /* Don't thrash... */
2589 ap_daemons_max_free = ap_daemons_min_free + 1;
2591 /* If we're doing a graceful_restart then we're going to see a lot
2592 * of children exiting immediately when we get into the main loop
2593 * below (because we just sent them SIGUSR1). This happens pretty
2594 * rapidly... and for each one that exits we'll start a new one until
2595 * we reach at least daemons_min_free. But we may be permitted to
2596 * start more than that, so we'll just keep track of how many we're
2597 * supposed to start up without the 1 second penalty between each fork.
2599 remaining_children_to_start = ap_daemons_to_start;
2600 if (remaining_children_to_start > ap_daemons_limit) {
2601 remaining_children_to_start = ap_daemons_limit;
2604 startup_children(remaining_children_to_start);
2605 remaining_children_to_start = 0;
2608 /* give the system some time to recover before kicking into
2609 * exponential mode */
2610 hold_off_on_exponential_spawning = 10;
2613 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, server_conf,
2614 "%s configured -- resuming normal operations",
2615 ap_get_server_version());
2616 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, server_conf,
2617 "Server built: %s", ap_get_server_built());
2618 restart_pending = shutdown_pending = 0;
2620 while (!restart_pending && !shutdown_pending) {
2623 int pid = wait_or_timeout(&status);
2625 /* XXX: if it takes longer than 1 second for all our children
2626 * to start up and get into IDLE state then we may spawn an
2630 process_child_status(pid, status);
2631 /* non-fatal death... note that it's gone in the scoreboard. */
2632 ap_sync_scoreboard_image();
2633 child_slot = find_child_by_pid(pid);
2634 if (child_slot >= 0) {
2635 (void) ap_update_child_status(child_slot, SERVER_DEAD,
2636 (request_rec *) NULL);
2637 if (remaining_children_to_start
2638 && child_slot < ap_daemons_limit) {
2639 /* we're still doing a 1-for-1 replacement of dead
2640 * children with new children
2642 make_child(server_conf, child_slot, time(0));
2643 --remaining_children_to_start;
2645 #ifdef HAS_OTHER_CHILD
2647 else if (reap_other_child(pid, status) == 0) {
2651 else if (is_graceful) {
2652 /* Great, we've probably just lost a slot in the
2653 * scoreboard. Somehow we don't know about this
2656 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
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, errno, 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, 0, 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, 0, 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, errno, 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, errno, server_conf, "killpg SIGHUP");
2761 reclaim_child_processes(0); /* Not when just starting up */
2762 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, 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)
2971 /* Stub functions until this MPM supports the connection status API */
2973 API_EXPORT(void) ap_update_connection_status(long conn_id, const char *key, \
2979 API_EXPORT(void) ap_reset_connection_status(long conn_id)
2984 static const command_rec prefork_cmds[] = {
2985 UNIX_DAEMON_COMMANDS
2987 { "PidFile", set_pidfile, NULL, RSRC_CONF, TAKE1,
2988 "A file for logging the server process ID"},
2989 { "ScoreBoardFile", set_scoreboard, NULL, RSRC_CONF, TAKE1,
2990 "A file for Apache to maintain runtime process management information"},
2991 { "LockFile", set_lockfile, NULL, RSRC_CONF, TAKE1,
2992 "The lockfile used when Apache needs to lock the accept() call"},
2993 { "StartServers", set_daemons_to_start, NULL, RSRC_CONF, TAKE1,
2994 "Number of child processes launched at server startup" },
2995 { "MinSpareServers", set_min_free_servers, NULL, RSRC_CONF, TAKE1,
2996 "Minimum number of idle children, to handle request spikes" },
2997 { "MaxSpareServers", set_max_free_servers, NULL, RSRC_CONF, TAKE1,
2998 "Maximum number of idle children" },
2999 { "MaxClients", set_server_limit, NULL, RSRC_CONF, TAKE1,
3000 "Maximum number of children alive at the same time" },
3001 { "MaxRequestsPerChild", set_max_requests, NULL, RSRC_CONF, TAKE1,
3002 "Maximum number of requests a particular child serves before dying." },
3003 { "CoreDumpDirectory", set_coredumpdir, NULL, RSRC_CONF, TAKE1,
3004 "The location of the directory Apache changes to before dumping core" },
3008 module MODULE_VAR_EXPORT mpm_prefork_module = {
3009 STANDARD20_MODULE_STUFF,
3010 NULL, /* create per-directory config structure */
3011 NULL, /* merge per-directory config structures */
3012 NULL, /* create per-server config structure */
3013 NULL, /* merge per-server config structures */
3014 prefork_cmds, /* command ap_table_t */
3015 NULL, /* handlers */
3016 prefork_hooks, /* register hooks */