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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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);
676 * Initialize mutex lock.
677 * Must be safe to call this on a restart.
679 static void accept_mutex_init(pool *p)
681 int rc = DosCreateMutexSem(NULL, &lock_sem, DC_SEM_SHARED, FALSE);
684 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
685 "Parent cannot create lock semaphore, rc=%d", rc);
689 ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
692 static void accept_mutex_on(void)
694 int rc = DosRequestMutexSem(lock_sem, SEM_INDEFINITE_WAIT);
697 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
698 "OS2SEM: Error %d getting accept lock. Exiting!", rc);
699 clean_child_exit(APEXIT_CHILDFATAL);
703 static void accept_mutex_off(void)
705 int rc = DosReleaseMutexSem(lock_sem);
708 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
709 "OS2SEM: Error %d freeing accept lock. Exiting!", rc);
710 clean_child_exit(APEXIT_CHILDFATAL);
714 #elif defined(USE_TPF_CORE_SERIALIZED_ACCEPT)
716 static int tpf_core_held;
718 static void accept_mutex_cleanup(void *foo)
724 #define accept_mutex_init(x)
726 static void accept_mutex_child_init(pool *p)
728 ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
732 static void accept_mutex_on(void)
739 static void accept_mutex_off(void)
747 /* Default --- no serialization. Other methods *could* go here,
750 #if !defined(MULTITHREAD)
751 /* Multithreaded systems don't complete between processes for
753 #define NO_SERIALIZED_ACCEPT
754 #define accept_mutex_child_init(x)
755 #define accept_mutex_init(x)
756 #define accept_mutex_on()
757 #define accept_mutex_off()
761 /* On some architectures it's safe to do unserialized accept()s in the single
762 * Listen case. But it's never safe to do it in the case where there's
763 * multiple Listen statements. Define SINGLE_LISTEN_UNSERIALIZED_ACCEPT
764 * when it's safe in the single Listen case.
766 #ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
767 #define SAFE_ACCEPT(stmt) do {if (ap_listeners->next) {stmt;}} while(0)
769 #define SAFE_ACCEPT(stmt) do {stmt;} while(0)
773 /*****************************************************************
774 * dealing with other children
777 #ifdef HAS_OTHER_CHILD
778 API_EXPORT(void) ap_register_other_child(int pid,
779 void (*maintenance) (int reason, void *, ap_wait_t status),
780 void *data, int write_fd)
782 other_child_rec *ocr;
784 ocr = ap_palloc(pconf, sizeof(*ocr));
786 ocr->maintenance = maintenance;
788 ocr->write_fd = write_fd;
789 ocr->next = other_children;
790 other_children = ocr;
793 /* note that since this can be called by a maintenance function while we're
794 * scanning the other_children list, all scanners should protect themself
795 * by loading ocr->next before calling any maintenance function.
797 API_EXPORT(void) ap_unregister_other_child(void *data)
799 other_child_rec **pocr, *nocr;
801 for (pocr = &other_children; *pocr; pocr = &(*pocr)->next) {
802 if ((*pocr)->data == data) {
803 nocr = (*pocr)->next;
804 (*(*pocr)->maintenance) (OC_REASON_UNREGISTER, (*pocr)->data, -1);
806 /* XXX: um, well we've just wasted some space in pconf ? */
812 /* test to ensure that the write_fds are all still writable, otherwise
813 * invoke the maintenance functions as appropriate */
814 static void probe_writable_fds(void)
818 other_child_rec *ocr, *nocr;
822 if (other_children == NULL)
826 FD_ZERO(&writable_fds);
828 for (ocr = other_children; ocr; ocr = ocr->next) {
829 if (ocr->write_fd == -1)
831 FD_SET(ocr->write_fd, &writable_fds);
832 if (ocr->write_fd > fd_max) {
833 fd_max = ocr->write_fd;
841 rc = ap_select(fd_max + 1, NULL, &writable_fds, NULL, &tv);
842 } while (rc == -1 && errno == EINTR);
845 /* XXX: uhh this could be really bad, we could have a bad file
846 * descriptor due to a bug in one of the maintenance routines */
847 ap_log_unixerr("probe_writable_fds", "select",
848 "could not probe writable fds", server_conf);
854 for (ocr = other_children; ocr; ocr = nocr) {
856 if (ocr->write_fd == -1)
858 if (FD_ISSET(ocr->write_fd, &writable_fds))
860 (*ocr->maintenance) (OC_REASON_UNWRITABLE, ocr->data, -1);
864 /* possibly reap an other_child, return 0 if yes, -1 if not */
865 static int reap_other_child(int pid, ap_wait_t status)
867 other_child_rec *ocr, *nocr;
869 for (ocr = other_children; ocr; ocr = nocr) {
874 (*ocr->maintenance) (OC_REASON_DEATH, ocr->data, status);
881 /*****************************************************************
883 * Dealing with the scoreboard... a lot of these variables are global
884 * only to avoid getting clobbered by the longjmp() that happens when
885 * a hard timeout expires...
887 * We begin with routines which deal with the file itself...
890 #if defined(USE_OS2_SCOREBOARD)
892 /* The next two routines are used to access shared memory under OS/2. */
893 /* This requires EMX v09c to be installed. */
895 caddr_t create_shared_heap(const char *name, size_t size)
901 rc = DosAllocSharedMem(&mem, name, size,
902 PAG_COMMIT | PAG_READ | PAG_WRITE);
905 h = _ucreate(mem, size, !_BLOCK_CLEAN, _HEAP_REGULAR | _HEAP_SHARED,
912 caddr_t get_shared_heap(const char *Name)
915 PVOID BaseAddress; /* Pointer to the base address of
916 the shared memory object */
917 ULONG AttributeFlags; /* Flags describing characteristics
918 of the shared memory object */
919 APIRET rc; /* Return code */
921 /* Request read and write access to */
922 /* the shared memory object */
923 AttributeFlags = PAG_WRITE | PAG_READ;
925 rc = DosGetNamedSharedMem(&BaseAddress, Name, AttributeFlags);
928 printf("DosGetNamedSharedMem error: return code = %ld", rc);
935 static void setup_shared_mem(pool *p)
941 m = (caddr_t) create_shared_heap("\\SHAREMEM\\SCOREBOARD", SCOREBOARD_SIZE);
943 fprintf(stderr, "%s: Could not create OS/2 Shared memory pool.\n",
948 rc = _uopen((Heap_t) m);
951 "%s: Could not uopen() newly created OS/2 Shared memory pool.\n",
954 ap_scoreboard_image = (scoreboard *) m;
955 ap_scoreboard_image->global.running_generation = 0;
958 static void reopen_scoreboard(pool *p)
963 m = (caddr_t) get_shared_heap("\\SHAREMEM\\SCOREBOARD");
965 fprintf(stderr, "%s: Could not find existing OS/2 Shared memory pool.\n",
970 rc = _uopen((Heap_t) m);
971 ap_scoreboard_image = (scoreboard *) m;
974 #elif defined(USE_POSIX_SCOREBOARD)
975 #include <sys/mman.h>
980 * As of version 4.23A, shared memory in QNX must reside under /dev/shmem,
981 * where no subdirectories allowed.
983 * POSIX shm_open() and shm_unlink() will take care about this issue,
984 * but to avoid confusion, I suggest to redefine scoreboard file name
985 * in httpd.conf to cut "logs/" from it. With default setup actual name
986 * will be "/dev/shmem/logs.apache_status".
988 * If something went wrong and Apache did not unlinked this object upon
989 * exit, you can remove it manually, using "rm -f" command.
992 * <sys/mman.h> in QNX defines MAP_ANON, but current implementation
993 * does NOT support BSD style anonymous mapping. So, the order of
994 * conditional compilation is important:
995 * this #ifdef section must be ABOVE the next one (BSD style).
997 * I tested this stuff and it works fine for me, but if it provides
998 * trouble for you, just comment out USE_MMAP_SCOREBOARD in QNX section
1002 * Igor N. Kovalenko -- infoh@mail.wplus.net
1005 static void cleanup_shared_mem(void *d)
1007 shm_unlink(ap_scoreboard_fname);
1010 static void setup_shared_mem(pool *p)
1016 fd = shm_open(ap_scoreboard_fname, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
1018 ap_snprintf(buf, sizeof(buf), "%s: could not open(create) scoreboard",
1023 if (ltrunc(fd, (off_t) SCOREBOARD_SIZE, SEEK_SET) == -1) {
1024 ap_snprintf(buf, sizeof(buf), "%s: could not ltrunc scoreboard",
1027 shm_unlink(ap_scoreboard_fname);
1030 if ((m = (caddr_t) mmap((caddr_t) 0,
1031 (size_t) SCOREBOARD_SIZE, PROT_READ | PROT_WRITE,
1032 MAP_SHARED, fd, (off_t) 0)) == (caddr_t) - 1) {
1033 ap_snprintf(buf, sizeof(buf), "%s: cannot mmap scoreboard",
1036 shm_unlink(ap_scoreboard_fname);
1040 ap_register_cleanup(p, NULL, cleanup_shared_mem, ap_null_cleanup);
1041 ap_scoreboard_image = (scoreboard *) m;
1042 ap_scoreboard_image->global.running_generation = 0;
1045 static void reopen_scoreboard(pool *p)
1049 #elif defined(USE_MMAP_SCOREBOARD)
1051 static void setup_shared_mem(pool *p)
1055 #if defined(MAP_ANON)
1059 * 9-Aug-97 - Jeff Venters (venters@convex.hp.com)
1060 * ConvexOS maps address space as follows:
1061 * 0x00000000 - 0x7fffffff : Kernel
1062 * 0x80000000 - 0xffffffff : User
1063 * Start mmapped area 1GB above start of text.
1065 * Also, the length requires a pointer as the actual length is
1066 * returned (rounded up to a page boundary).
1069 unsigned len = SCOREBOARD_SIZE;
1071 m = mmap((caddr_t) 0xC0000000, &len,
1072 PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, NOFD, 0);
1074 #elif defined(MAP_TMPFILE)
1076 char mfile[] = "/tmp/apache_shmem_XXXX";
1077 int fd = mkstemp(mfile);
1080 fprintf(stderr, "%s: Could not open %s\n", ap_server_argv0, mfile);
1083 m = mmap((caddr_t) 0, SCOREBOARD_SIZE,
1084 PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
1085 if (m == (caddr_t) - 1) {
1087 fprintf(stderr, "%s: Could not mmap %s\n", ap_server_argv0, mfile);
1094 m = mmap((caddr_t) 0, SCOREBOARD_SIZE,
1095 PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0);
1097 if (m == (caddr_t) - 1) {
1099 fprintf(stderr, "%s: Could not mmap memory\n", ap_server_argv0);
1106 fd = open("/dev/zero", O_RDWR);
1109 fprintf(stderr, "%s: Could not open /dev/zero\n", ap_server_argv0);
1112 m = mmap((caddr_t) 0, SCOREBOARD_SIZE,
1113 PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
1114 if (m == (caddr_t) - 1) {
1116 fprintf(stderr, "%s: Could not mmap /dev/zero\n", ap_server_argv0);
1121 ap_scoreboard_image = (scoreboard *) m;
1122 ap_scoreboard_image->global.running_generation = 0;
1125 static void reopen_scoreboard(pool *p)
1129 #elif defined(USE_SHMGET_SCOREBOARD)
1130 static key_t shmkey = IPC_PRIVATE;
1131 static int shmid = -1;
1133 static void setup_shared_mem(pool *p)
1135 struct shmid_ds shmbuf;
1140 if ((shmid = shmget(shmkey, SCOREBOARD_SIZE, IPC_CREAT | SHM_R | SHM_W)) == -1) {
1142 if (errno == ENOSYS) {
1143 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
1144 "Your kernel was built without CONFIG_SYSVIPC\n"
1145 "%s: Please consult the Apache FAQ for details",
1149 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
1150 "could not call shmget");
1154 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, server_conf,
1155 "created shared memory segment #%d", shmid);
1159 * Some SysV systems place the shared segment WAY too close
1160 * to the dynamic memory break point (sbrk(0)). This severely
1161 * limits the use of malloc/sbrk in the program since sbrk will
1162 * refuse to move past that point.
1164 * To get around this, we move the break point "way up there",
1165 * attach the segment and then move break back down. Ugly
1167 if ((obrk = sbrk(MOVEBREAK)) == (char *) -1) {
1168 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
1169 "sbrk() could not move break");
1173 #define BADSHMAT ((scoreboard *)(-1))
1174 if ((ap_scoreboard_image = (scoreboard *) shmat(shmid, 0, 0)) == BADSHMAT) {
1175 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf, "shmat error");
1177 * We exit below, after we try to remove the segment
1180 else { /* only worry about permissions if we attached the segment */
1181 if (shmctl(shmid, IPC_STAT, &shmbuf) != 0) {
1182 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
1183 "shmctl() could not stat segment #%d", shmid);
1186 shmbuf.shm_perm.uid = unixd_config.user_id;
1187 shmbuf.shm_perm.gid = unixd_config.group_id;
1188 if (shmctl(shmid, IPC_SET, &shmbuf) != 0) {
1189 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
1190 "shmctl() could not set segment #%d", shmid);
1195 * We must avoid leaving segments in the kernel's
1198 if (shmctl(shmid, IPC_RMID, NULL) != 0) {
1199 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf,
1200 "shmctl: IPC_RMID: could not remove shared memory segment #%d",
1203 if (ap_scoreboard_image == BADSHMAT) /* now bailout */
1207 if (obrk == (char *) -1)
1208 return; /* nothing else to do */
1209 if (sbrk(-(MOVEBREAK)) == (char *) -1) {
1210 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
1211 "sbrk() could not move break back");
1214 ap_scoreboard_image->global.running_generation = 0;
1217 static void reopen_scoreboard(pool *p)
1221 #elif defined(USE_TPF_SCOREBOARD)
1223 static void cleanup_scoreboard_heap()
1226 rv = rsysc(ap_scoreboard_image, SCOREBOARD_FRAMES, SCOREBOARD_NAME);
1227 if(rv == RSYSC_ERROR) {
1228 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
1229 "rsysc() could not release scoreboard system heap");
1233 static void setup_shared_mem(pool *p)
1235 cinfc(CINFC_WRITE, CINFC_CMMCTK2);
1236 ap_scoreboard_image = (scoreboard *) gsysc(SCOREBOARD_FRAMES, SCOREBOARD_NAME);
1238 if (!ap_scoreboard_image) {
1239 fprintf(stderr, "httpd: Could not create scoreboard system heap storage.\n");
1243 ap_register_cleanup(p, NULL, cleanup_scoreboard_heap, ap_null_cleanup);
1244 ap_scoreboard_image->global.running_generation = 0;
1247 static void reopen_scoreboard(pool *p)
1249 cinfc(CINFC_WRITE, CINFC_CMMCTK2);
1253 #define SCOREBOARD_FILE
1254 static scoreboard _scoreboard_image;
1255 static int scoreboard_fd = -1;
1257 /* XXX: things are seriously screwed if we ever have to do a partial
1258 * read or write ... we could get a corrupted scoreboard
1260 static int force_write(int fd, void *buffer, int bufsz)
1262 int rv, orig_sz = bufsz;
1265 rv = write(fd, buffer, bufsz);
1267 buffer = (char *) buffer + rv;
1270 } while ((rv > 0 && bufsz > 0) || (rv == -1 && errno == EINTR));
1272 return rv < 0 ? rv : orig_sz - bufsz;
1275 static int force_read(int fd, void *buffer, int bufsz)
1277 int rv, orig_sz = bufsz;
1280 rv = read(fd, buffer, bufsz);
1282 buffer = (char *) buffer + rv;
1285 } while ((rv > 0 && bufsz > 0) || (rv == -1 && errno == EINTR));
1287 return rv < 0 ? rv : orig_sz - bufsz;
1290 static void cleanup_scoreboard_file(void *foo)
1292 unlink(ap_scoreboard_fname);
1295 void reopen_scoreboard(pool *p)
1297 if (scoreboard_fd != -1)
1298 ap_pclosef(p, scoreboard_fd);
1301 ap_scoreboard_fname = ap_server_root_relative(p, ap_scoreboard_fname);
1303 scoreboard_fd = ap_popenf(p, ap_scoreboard_fname, O_CREAT | O_BINARY | O_RDWR, 0666);
1304 if (scoreboard_fd == -1) {
1305 perror(ap_scoreboard_fname);
1306 fprintf(stderr, "Cannot open scoreboard file:\n");
1307 clean_child_exit(1);
1312 /* Called by parent process */
1313 static void reinit_scoreboard(pool *p)
1315 int running_gen = 0;
1316 if (ap_scoreboard_image)
1317 running_gen = ap_scoreboard_image->global.running_generation;
1319 #ifndef SCOREBOARD_FILE
1320 if (ap_scoreboard_image == NULL) {
1321 setup_shared_mem(p);
1323 memset(ap_scoreboard_image, 0, SCOREBOARD_SIZE);
1324 ap_scoreboard_image->global.running_generation = running_gen;
1326 ap_scoreboard_image = &_scoreboard_image;
1327 ap_scoreboard_fname = ap_server_root_relative(p, ap_scoreboard_fname);
1329 scoreboard_fd = ap_popenf(p, ap_scoreboard_fname, O_CREAT | O_BINARY | O_RDWR, 0644);
1330 if (scoreboard_fd == -1) {
1331 perror(ap_scoreboard_fname);
1332 fprintf(stderr, "Cannot open scoreboard file:\n");
1335 ap_register_cleanup(p, NULL, cleanup_scoreboard_file, ap_null_cleanup);
1337 memset((char *) ap_scoreboard_image, 0, sizeof(*ap_scoreboard_image));
1338 ap_scoreboard_image->global.running_generation = running_gen;
1339 force_write(scoreboard_fd, ap_scoreboard_image, sizeof(*ap_scoreboard_image));
1343 /* Routines called to deal with the scoreboard image
1344 * --- note that we do *not* need write locks, since update_child_status
1345 * only updates a *single* record in place, and only one process writes to
1346 * a given scoreboard slot at a time (either the child process owning that
1347 * slot, or the parent, noting that the child has died).
1349 * As a final note --- setting the score entry to getpid() is always safe,
1350 * since when the parent is writing an entry, it's only noting SERVER_DEAD
1354 ap_inline void ap_sync_scoreboard_image(void)
1356 #ifdef SCOREBOARD_FILE
1357 lseek(scoreboard_fd, 0L, 0);
1358 force_read(scoreboard_fd, ap_scoreboard_image, sizeof(*ap_scoreboard_image));
1362 API_EXPORT(int) ap_exists_scoreboard_image(void)
1364 return (ap_scoreboard_image ? 1 : 0);
1367 static ap_inline void put_scoreboard_info(int child_num,
1368 short_score *new_score_rec)
1370 #ifdef SCOREBOARD_FILE
1371 lseek(scoreboard_fd, (long) child_num * sizeof(short_score), 0);
1372 force_write(scoreboard_fd, new_score_rec, sizeof(short_score));
1376 int ap_update_child_status(int child_num, int status, request_rec *r)
1386 ap_sync_scoreboard_image();
1387 ss = &ap_scoreboard_image->servers[child_num];
1388 old_status = ss->status;
1389 ss->status = status;
1391 if (ap_extended_status) {
1392 if (status == SERVER_READY || status == SERVER_DEAD) {
1394 * Reset individual counters
1396 if (status == SERVER_DEAD) {
1397 ss->my_access_count = 0L;
1398 ss->my_bytes_served = 0L;
1400 ss->conn_count = (unsigned short) 0;
1401 ss->conn_bytes = (unsigned long) 0;
1404 conn_rec *c = r->connection;
1405 ap_cpystrn(ss->client, ap_get_remote_host(c, r->per_dir_config,
1406 REMOTE_NOLOOKUP), sizeof(ss->client));
1407 if (r->the_request == NULL) {
1408 ap_cpystrn(ss->request, "NULL", sizeof(ss->request));
1409 } else if (r->parsed_uri.password == NULL) {
1410 ap_cpystrn(ss->request, r->the_request, sizeof(ss->request));
1412 /* Don't reveal the password in the server-status view */
1413 ap_cpystrn(ss->request, ap_pstrcat(r->pool, r->method, " ",
1414 ap_unparse_uri_components(r->pool, &r->parsed_uri, UNP_OMITPASSWORD),
1415 r->assbackwards ? NULL : " ", r->protocol, NULL),
1416 sizeof(ss->request));
1418 ss->vhostrec = r->server;
1421 if (status == SERVER_STARTING && r == NULL) {
1422 /* clean up the slot's vhostrec pointer (maybe re-used)
1423 * and mark the slot as belonging to a new generation.
1425 ss->vhostrec = NULL;
1426 ap_scoreboard_image->parent[child_num].generation = ap_my_generation;
1427 #ifdef SCOREBOARD_FILE
1428 lseek(scoreboard_fd, XtOffsetOf(scoreboard, parent[child_num]), 0);
1429 force_write(scoreboard_fd, &ap_scoreboard_image->parent[child_num],
1430 sizeof(parent_score));
1433 put_scoreboard_info(child_num, ss);
1438 static void update_scoreboard_global(void)
1440 #ifdef SCOREBOARD_FILE
1441 lseek(scoreboard_fd,
1442 (char *) &ap_scoreboard_image->global -(char *) ap_scoreboard_image, 0);
1443 force_write(scoreboard_fd, &ap_scoreboard_image->global,
1444 sizeof ap_scoreboard_image->global);
1448 void ap_time_process_request(int child_num, int status)
1451 #if defined(NO_GETTIMEOFDAY) && !defined(NO_TIMES)
1458 ap_sync_scoreboard_image();
1459 ss = &ap_scoreboard_image->servers[child_num];
1461 if (status == START_PREQUEST) {
1462 #if defined(NO_GETTIMEOFDAY)
1464 if ((ss->start_time = times(&tms_blk)) == -1)
1465 #endif /* NO_TIMES */
1466 ss->start_time = (clock_t) 0;
1468 if (gettimeofday(&ss->start_time, (struct timezone *) 0) < 0)
1469 ss->start_time.tv_sec =
1470 ss->start_time.tv_usec = 0L;
1473 else if (status == STOP_PREQUEST) {
1474 #if defined(NO_GETTIMEOFDAY)
1476 if ((ss->stop_time = times(&tms_blk)) == -1)
1478 ss->stop_time = ss->start_time = (clock_t) 0;
1480 if (gettimeofday(&ss->stop_time, (struct timezone *) 0) < 0)
1481 ss->stop_time.tv_sec =
1482 ss->stop_time.tv_usec =
1483 ss->start_time.tv_sec =
1484 ss->start_time.tv_usec = 0L;
1489 put_scoreboard_info(child_num, ss);
1493 static void increment_counts(int child_num, request_rec *r)
1498 ap_sync_scoreboard_image();
1499 ss = &ap_scoreboard_image->servers[child_num];
1502 ap_bgetopt(r->connection->client, BO_BYTECT, &bs);
1508 ss->my_access_count++;
1510 ss->bytes_served += (unsigned long) bs;
1511 ss->my_bytes_served += (unsigned long) bs;
1512 ss->conn_bytes += (unsigned long) bs;
1514 put_scoreboard_info(child_num, ss);
1518 static int find_child_by_pid(int pid)
1522 for (i = 0; i < max_daemons_limit; ++i)
1523 if (ap_scoreboard_image->parent[i].pid == pid)
1529 static void reclaim_child_processes(int terminate)
1533 long int waittime = 1024 * 16; /* in usecs */
1537 #ifdef HAS_OTHER_CHILD
1538 other_child_rec *ocr, *nocr;
1541 ap_sync_scoreboard_image();
1543 for (tries = terminate ? 4 : 1; tries <= 9; ++tries) {
1544 /* don't want to hold up progress any more than
1545 * necessary, but we need to allow children a few moments to exit.
1546 * Set delay with an exponential backoff.
1548 tv.tv_sec = waittime / 1000000;
1549 tv.tv_usec = waittime % 1000000;
1550 waittime = waittime * 4;
1551 ap_select(0, NULL, NULL, NULL, &tv);
1553 /* now see who is done */
1555 for (i = 0; i < max_daemons_limit; ++i) {
1556 int pid = ap_scoreboard_image->parent[i].pid;
1558 if (pid == my_pid || pid == 0)
1561 waitret = waitpid(pid, &status, WNOHANG);
1562 if (waitret == pid || waitret == -1) {
1563 ap_scoreboard_image->parent[i].pid = 0;
1572 /* perhaps it missed the SIGHUP, lets try again */
1573 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
1575 "child process %d did not exit, sending another SIGHUP",
1578 waittime = 1024 * 16;
1584 case 7: /* 1.4sec */
1585 /* ok, now it's being annoying */
1586 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
1588 "child process %d still did not exit, sending a SIGTERM",
1593 /* die child scum */
1594 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, server_conf,
1595 "child process %d still did not exit, sending a SIGKILL",
1599 case 9: /* 14 sec */
1600 /* gave it our best shot, but alas... If this really
1601 * is a child we are trying to kill and it really hasn't
1602 * exited, we will likely fail to bind to the port
1603 * after the restart.
1605 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, server_conf,
1606 "could not make child process %d exit, "
1607 "attempting to continue anyway", pid);
1611 #ifdef HAS_OTHER_CHILD
1612 for (ocr = other_children; ocr; ocr = nocr) {
1617 waitret = waitpid(ocr->pid, &status, WNOHANG);
1618 if (waitret == ocr->pid) {
1620 (*ocr->maintenance) (OC_REASON_DEATH, ocr->data, status);
1622 else if (waitret == 0) {
1623 (*ocr->maintenance) (OC_REASON_RESTART, ocr->data, -1);
1626 else if (waitret == -1) {
1627 /* uh what the heck? they didn't call unregister? */
1629 (*ocr->maintenance) (OC_REASON_LOST, ocr->data, -1);
1633 if (!not_dead_yet) {
1634 /* nothing left to wait for */
1638 #endif /* ndef MULTITHREAD */
1642 #if defined(NEED_WAITPID)
1644 Systems without a real waitpid sometimes lose a child's exit while waiting
1645 for another. Search through the scoreboard for missing children.
1647 int reap_children(ap_wait_t *status)
1651 for (n = 0; n < max_daemons_limit; ++n) {
1652 ap_sync_scoreboard_image();
1653 if (ap_scoreboard_image->servers[n].status != SERVER_DEAD &&
1654 kill((pid = ap_scoreboard_image->parent[n].pid), 0) == -1) {
1655 ap_update_child_status(n, SERVER_DEAD, NULL);
1656 /* just mark it as having a successful exit status */
1657 bzero((char *) status, sizeof(ap_wait_t));
1665 /* Finally, this routine is used by the caretaker process to wait for
1669 /* number of calls to wait_or_timeout between writable probes */
1670 #ifndef INTERVAL_OF_WRITABLE_PROBES
1671 #define INTERVAL_OF_WRITABLE_PROBES 10
1673 static int wait_or_timeout_counter;
1675 static int wait_or_timeout(ap_wait_t *status)
1680 ++wait_or_timeout_counter;
1681 if (wait_or_timeout_counter == INTERVAL_OF_WRITABLE_PROBES) {
1682 wait_or_timeout_counter = 0;
1683 #ifdef HAS_OTHER_CHILD
1684 probe_writable_fds();
1687 ret = waitpid(-1, status, WNOHANG);
1688 if (ret == -1 && errno == EINTR) {
1695 if ((ret = reap_children(status)) > 0) {
1699 tv.tv_sec = SCOREBOARD_MAINTENANCE_INTERVAL / 1000000;
1700 tv.tv_usec = SCOREBOARD_MAINTENANCE_INTERVAL % 1000000;
1701 ap_select(0, NULL, NULL, NULL, &tv);
1708 #elif defined(_NSIG)
1709 #define NumSIG _NSIG
1710 #elif defined(__NSIG)
1711 #define NumSIG __NSIG
1713 #define NumSIG 32 /* for 1998's unixes, this is still a good assumption */
1716 #ifdef SYS_SIGLIST /* platform has sys_siglist[] */
1717 #define INIT_SIGLIST() /*nothing*/
1718 #else /* platform has no sys_siglist[], define our own */
1719 #define SYS_SIGLIST ap_sys_siglist
1720 #define INIT_SIGLIST() siglist_init();
1722 const char *ap_sys_siglist[NumSIG];
1724 static void siglist_init(void)
1728 ap_sys_siglist[0] = "Signal 0";
1730 ap_sys_siglist[SIGHUP] = "Hangup";
1733 ap_sys_siglist[SIGINT] = "Interrupt";
1736 ap_sys_siglist[SIGQUIT] = "Quit";
1739 ap_sys_siglist[SIGILL] = "Illegal instruction";
1742 ap_sys_siglist[SIGTRAP] = "Trace/BPT trap";
1745 ap_sys_siglist[SIGIOT] = "IOT instruction";
1748 ap_sys_siglist[SIGABRT] = "Abort";
1751 ap_sys_siglist[SIGEMT] = "Emulator trap";
1754 ap_sys_siglist[SIGFPE] = "Arithmetic exception";
1757 ap_sys_siglist[SIGKILL] = "Killed";
1760 ap_sys_siglist[SIGBUS] = "Bus error";
1763 ap_sys_siglist[SIGSEGV] = "Segmentation fault";
1766 ap_sys_siglist[SIGSYS] = "Bad system call";
1769 ap_sys_siglist[SIGPIPE] = "Broken pipe";
1772 ap_sys_siglist[SIGALRM] = "Alarm clock";
1775 ap_sys_siglist[SIGTERM] = "Terminated";
1778 ap_sys_siglist[SIGUSR1] = "User defined signal 1";
1781 ap_sys_siglist[SIGUSR2] = "User defined signal 2";
1784 ap_sys_siglist[SIGCLD] = "Child status change";
1787 ap_sys_siglist[SIGCHLD] = "Child status change";
1790 ap_sys_siglist[SIGPWR] = "Power-fail restart";
1793 ap_sys_siglist[SIGWINCH] = "Window changed";
1796 ap_sys_siglist[SIGURG] = "urgent socket condition";
1799 ap_sys_siglist[SIGPOLL] = "Pollable event occurred";
1802 ap_sys_siglist[SIGIO] = "socket I/O possible";
1805 ap_sys_siglist[SIGSTOP] = "Stopped (signal)";
1808 ap_sys_siglist[SIGTSTP] = "Stopped";
1811 ap_sys_siglist[SIGCONT] = "Continued";
1814 ap_sys_siglist[SIGTTIN] = "Stopped (tty input)";
1817 ap_sys_siglist[SIGTTOU] = "Stopped (tty output)";
1820 ap_sys_siglist[SIGVTALRM] = "virtual timer expired";
1823 ap_sys_siglist[SIGPROF] = "profiling timer expired";
1826 ap_sys_siglist[SIGXCPU] = "exceeded cpu limit";
1829 ap_sys_siglist[SIGXFSZ] = "exceeded file size limit";
1831 for (sig=0; sig < sizeof(ap_sys_siglist)/sizeof(ap_sys_siglist[0]); ++sig)
1832 if (ap_sys_siglist[sig] == NULL)
1833 ap_sys_siglist[sig] = "";
1835 #endif /* platform has sys_siglist[] */
1838 /* handle all varieties of core dumping signals */
1839 static void sig_coredump(int sig)
1841 chdir(ap_coredump_dir);
1842 signal(sig, SIG_DFL);
1843 kill(getpid(), sig);
1844 /* At this point we've got sig blocked, because we're still inside
1845 * the signal handler. When we leave the signal handler it will
1846 * be unblocked, and we'll take the signal... and coredump or whatever
1847 * is appropriate for this particular Unix. In addition the parent
1848 * will see the real signal we received -- whereas if we called
1849 * abort() here, the parent would only see SIGABRT.
1853 /*****************************************************************
1854 * Connection structures and accounting...
1857 static void just_die(int sig)
1859 clean_child_exit(0);
1862 static int volatile deferred_die;
1863 static int volatile usr1_just_die;
1865 static void usr1_handler(int sig)
1867 if (usr1_just_die) {
1873 /* volatile just in case */
1874 static int volatile shutdown_pending;
1875 static int volatile restart_pending;
1876 static int volatile is_graceful;
1877 ap_generation_t volatile ap_my_generation=0;
1879 static void sig_term(int sig)
1881 if (shutdown_pending == 1) {
1882 /* Um, is this _probably_ not an error, if the user has
1883 * tried to do a shutdown twice quickly, so we won't
1884 * worry about reporting it.
1888 shutdown_pending = 1;
1891 static void restart(int sig)
1893 if (restart_pending == 1) {
1894 /* Probably not an error - don't bother reporting it */
1897 restart_pending = 1;
1898 is_graceful = sig == SIGUSR1;
1901 static void set_signals(void)
1903 #ifndef NO_USE_SIGACTION
1904 struct sigaction sa;
1906 sigemptyset(&sa.sa_mask);
1910 sa.sa_handler = sig_coredump;
1911 #if defined(SA_ONESHOT)
1912 sa.sa_flags = SA_ONESHOT;
1913 #elif defined(SA_RESETHAND)
1914 sa.sa_flags = SA_RESETHAND;
1916 if (sigaction(SIGSEGV, &sa, NULL) < 0)
1917 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGSEGV)");
1919 if (sigaction(SIGBUS, &sa, NULL) < 0)
1920 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGBUS)");
1923 if (sigaction(SIGABORT, &sa, NULL) < 0)
1924 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGABORT)");
1927 if (sigaction(SIGABRT, &sa, NULL) < 0)
1928 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGABRT)");
1931 if (sigaction(SIGILL, &sa, NULL) < 0)
1932 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGILL)");
1936 sa.sa_handler = sig_term;
1937 if (sigaction(SIGTERM, &sa, NULL) < 0)
1938 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGTERM)");
1940 if (sigaction(SIGINT, &sa, NULL) < 0)
1941 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGINT)");
1944 sa.sa_handler = SIG_DFL;
1945 if (sigaction(SIGXCPU, &sa, NULL) < 0)
1946 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGXCPU)");
1949 sa.sa_handler = SIG_DFL;
1950 if (sigaction(SIGXFSZ, &sa, NULL) < 0)
1951 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGXFSZ)");
1954 sa.sa_handler = SIG_IGN;
1955 if (sigaction(SIGPIPE, &sa, NULL) < 0)
1956 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGPIPE)");
1959 /* we want to ignore HUPs and USR1 while we're busy processing one */
1960 sigaddset(&sa.sa_mask, SIGHUP);
1961 sigaddset(&sa.sa_mask, SIGUSR1);
1962 sa.sa_handler = restart;
1963 if (sigaction(SIGHUP, &sa, NULL) < 0)
1964 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGHUP)");
1965 if (sigaction(SIGUSR1, &sa, NULL) < 0)
1966 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "sigaction(SIGUSR1)");
1969 signal(SIGSEGV, sig_coredump);
1971 signal(SIGBUS, sig_coredump);
1974 signal(SIGABORT, sig_coredump);
1975 #endif /* SIGABORT */
1977 signal(SIGABRT, sig_coredump);
1978 #endif /* SIGABRT */
1980 signal(SIGILL, sig_coredump);
1983 signal(SIGXCPU, SIG_DFL);
1984 #endif /* SIGXCPU */
1986 signal(SIGXFSZ, SIG_DFL);
1987 #endif /* SIGXFSZ */
1990 signal(SIGTERM, sig_term);
1992 signal(SIGHUP, restart);
1995 signal(SIGUSR1, restart);
1996 #endif /* SIGUSR1 */
1998 signal(SIGPIPE, SIG_IGN);
1999 #endif /* SIGPIPE */
2004 #if defined(TCP_NODELAY) && !defined(MPE) && !defined(TPF)
2005 static void sock_disable_nagle(int s)
2007 /* The Nagle algorithm says that we should delay sending partial
2008 * packets in hopes of getting more data. We don't want to do
2009 * this; we are not telnet. There are bad interactions between
2010 * persistent connections and Nagle's algorithm that have very severe
2011 * performance penalties. (Failing to disable Nagle is not much of a
2012 * problem with simple HTTP.)
2014 * In spite of these problems, failure here is not a shooting offense.
2016 int just_say_no = 1;
2018 if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (char *) &just_say_no,
2020 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf,
2021 "setsockopt: (TCP_NODELAY)");
2026 #define sock_disable_nagle(s) /* NOOP */
2030 /*****************************************************************
2031 * Child process main loop.
2032 * The following vars are static to avoid getting clobbered by longjmp();
2033 * they are really private to child_main.
2038 static int requests_this_child;
2039 static fd_set main_fds;
2041 API_EXPORT(void) ap_child_terminate(request_rec *r)
2043 r->connection->keepalive = 0;
2044 requests_this_child = ap_max_requests_per_child = 1;
2047 int ap_graceful_stop_signalled(void)
2049 ap_sync_scoreboard_image();
2051 ap_scoreboard_image->global.running_generation != ap_my_generation) {
2057 static void child_main(int child_num_arg)
2060 struct sockaddr sa_server;
2061 struct sockaddr sa_client;
2063 ap_listen_rec *last_lr;
2064 ap_listen_rec *first_lr;
2066 conn_rec *current_conn;
2071 my_child_num = child_num_arg;
2072 requests_this_child = 0;
2075 /* Get a sub pool for global allocations in this child, so that
2076 * we can have cleanups occur when the child exits.
2078 pchild = ap_make_sub_pool(pconf);
2080 ptrans = ap_make_sub_pool(pchild);
2082 /* needs to be done before we switch UIDs so we have permissions */
2083 reopen_scoreboard(pchild);
2084 SAFE_ACCEPT(accept_mutex_child_init(pchild));
2086 if (unixd_setup_child()) {
2087 clean_child_exit(APEXIT_CHILDFATAL);
2090 ap_child_init_hook(pchild, server_conf);
2092 (void) ap_update_child_status(my_child_num, SERVER_READY, (request_rec *) NULL);
2094 signal(SIGHUP, just_die);
2095 signal(SIGTERM, just_die);
2098 /* Stop Ctrl-C/Ctrl-Break signals going to child processes */
2100 unsigned long ulTimes;
2101 DosSetSignalExceptionFocus(0, &ulTimes);
2105 while (!ap_graceful_stop_signalled()) {
2108 /* Prepare to receive a SIGUSR1 due to graceful restart so that
2109 * we can exit cleanly.
2112 signal(SIGUSR1, usr1_handler);
2115 * (Re)initialize this child to a pre-connection state.
2118 current_conn = NULL;
2120 ap_clear_pool(ptrans);
2122 if ((ap_max_requests_per_child > 0
2123 && requests_this_child++ >= ap_max_requests_per_child)) {
2124 clean_child_exit(0);
2127 (void) ap_update_child_status(my_child_num, SERVER_READY, (request_rec *) NULL);
2130 * Wait for an acceptable connection to arrive.
2133 /* Lock around "accept", if necessary */
2134 SAFE_ACCEPT(accept_mutex_on());
2137 if (ap_listeners->next) {
2138 /* more than one socket */
2139 memcpy(&main_fds, &listenfds, sizeof(fd_set));
2140 srv = ap_select(listenmaxfd + 1, &main_fds, NULL, NULL, NULL);
2142 if (srv < 0 && errno != EINTR) {
2143 /* Single Unix documents select as returning errnos
2144 * EBADF, EINTR, and EINVAL... and in none of those
2145 * cases does it make sense to continue. In fact
2146 * on Linux 2.0.x we seem to end up with EFAULT
2147 * occasionally, and we'd loop forever due to it.
2149 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf, "select: (listen)");
2150 clean_child_exit(1);
2156 /* we remember the last_lr we searched last time around so that
2157 we don't end up starving any particular listening socket */
2158 if (last_lr == NULL) {
2169 if (FD_ISSET(lr->fd, &main_fds))
2173 while (lr != first_lr);
2180 /* only one socket, just pretend we did the other stuff */
2181 sd = ap_listeners->fd;
2184 /* if we accept() something we don't want to die, so we have to
2190 /* we didn't get a socket, and we were told to die */
2191 clean_child_exit(0);
2193 clen = sizeof(sa_client);
2194 csd = ap_accept(sd, &sa_client, &clen);
2195 if (csd >= 0 || errno != EINTR)
2200 break; /* We have a socket ready for reading */
2203 /* Our old behaviour here was to continue after accept()
2204 * errors. But this leads us into lots of troubles
2205 * because most of the errors are quite fatal. For
2206 * example, EMFILE can be caused by slow descriptor
2207 * leaks (say in a 3rd party module, or libc). It's
2208 * foolish for us to continue after an EMFILE. We also
2209 * seem to tickle kernel bugs on some platforms which
2210 * lead to never-ending loops here. So it seems best
2211 * to just exit in most cases.
2215 /* EPROTO on certain older kernels really means
2216 * ECONNABORTED, so we need to ignore it for them.
2217 * See discussion in new-httpd archives nh.9701
2218 * search for EPROTO.
2220 * Also see nh.9603, search for EPROTO:
2221 * There is potentially a bug in Solaris 2.x x<6,
2222 * and other boxes that implement tcp sockets in
2223 * userland (i.e. on top of STREAMS). On these
2224 * systems, EPROTO can actually result in a fatal
2225 * loop. See PR#981 for example. It's hard to
2226 * handle both uses of EPROTO.
2233 /* Linux generates the rest of these, other tcp
2234 * stacks (i.e. bsd) tend to hide them behind
2235 * getsockopt() interfaces. They occur when
2236 * the net goes sour or the client disconnects
2237 * after the three-way handshake has been done
2238 * in the kernel but before userland has picked
2256 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
2257 "offload device inactive");
2258 clean_child_exit(APEXIT_CHILDFATAL);
2261 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, server_conf,
2262 "select/accept error (%u)", errno);
2263 clean_child_exit(APEXIT_CHILDFATAL);
2266 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
2267 "accept: (client socket)");
2268 clean_child_exit(1);
2273 if (ap_graceful_stop_signalled()) {
2274 clean_child_exit(0);
2279 SAFE_ACCEPT(accept_mutex_off()); /* unlock after "accept" */
2282 if (csd == 0) /* 0 is invalid socket for TPF */
2286 /* We've got a socket, let's at least process one request off the
2287 * socket before we accept a graceful restart request. We set
2288 * the signal to ignore because we don't want to disturb any
2291 signal(SIGUSR1, SIG_IGN);
2294 * We now have a connection, so set it up with the appropriate
2295 * socket options, file descriptors, and read/write buffers.
2298 clen = sizeof(sa_server);
2299 if (getsockname(csd, &sa_server, &clen) < 0) {
2300 ap_log_error(APLOG_MARK, APLOG_ERR, server_conf, "getsockname");
2305 sock_disable_nagle(csd);
2307 iol = unix_attach_socket(csd);
2309 if (errno == EBADF) {
2310 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, NULL,
2311 "filedescriptor (%u) larger than FD_SETSIZE (%u) "
2312 "found, you probably need to rebuild Apache with a "
2313 "larger FD_SETSIZE", csd, FD_SETSIZE);
2316 ap_log_error(APLOG_MARK, APLOG_WARNING, NULL,
2317 "error attaching to socket");
2323 (void) ap_update_child_status(my_child_num, SERVER_BUSY_READ,
2324 (request_rec *) NULL);
2326 conn_io = ap_bcreate(ptrans, B_RDWR);
2328 ap_bpush_iol(conn_io, iol);
2330 current_conn = ap_new_connection(ptrans, server_conf, conn_io,
2331 (struct sockaddr_in *) &sa_client,
2332 (struct sockaddr_in *) &sa_server,
2335 ap_process_connection(current_conn);
2340 static int make_child(server_rec *s, int slot, time_t now)
2344 if (slot + 1 > max_daemons_limit) {
2345 max_daemons_limit = slot + 1;
2349 signal(SIGHUP, just_die);
2350 signal(SIGINT, just_die);
2352 signal(SIGQUIT, SIG_DFL);
2354 signal(SIGTERM, just_die);
2358 (void) ap_update_child_status(slot, SERVER_STARTING, (request_rec *) NULL);
2362 /* BS2000 requires a "special" version of fork() before a setuid() call */
2363 if ((pid = os_fork(unixd_config.user_name)) == -1) {
2365 if ((pid = os_fork(s, slot)) == -1) {
2367 if ((pid = fork()) == -1) {
2369 ap_log_error(APLOG_MARK, APLOG_ERR, s, "fork: Unable to fork new process");
2371 /* fork didn't succeed. Fix the scoreboard or else
2372 * it will say SERVER_STARTING forever and ever
2374 (void) ap_update_child_status(slot, SERVER_DEAD, (request_rec *) NULL);
2376 /* In case system resources are maxxed out, we don't want
2377 Apache running away with the CPU trying to fork over and
2378 over and over again. */
2385 #ifdef AIX_BIND_PROCESSOR
2386 /* by default AIX binds to a single processor
2387 * this bit unbinds children which will then bind to another cpu
2389 #include <sys/processor.h>
2390 int status = bindprocessor(BINDPROCESS, (int)getpid(),
2391 PROCESSOR_CLASS_ANY);
2393 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, server_conf,
2394 "processor unbind failed %d", status);
2397 RAISE_SIGSTOP(MAKE_CHILD);
2398 /* Disable the restart signal handlers and enable the just_die stuff.
2399 * Note that since restart() just notes that a restart has been
2400 * requested there's no race condition here.
2402 signal(SIGHUP, just_die);
2403 signal(SIGUSR1, just_die);
2404 signal(SIGTERM, just_die);
2408 ap_scoreboard_image->parent[slot].pid = pid;
2409 #ifdef SCOREBOARD_FILE
2410 lseek(scoreboard_fd, XtOffsetOf(scoreboard, parent[slot]), 0);
2411 force_write(scoreboard_fd, &ap_scoreboard_image->parent[slot],
2412 sizeof(parent_score));
2419 /* start up a bunch of children */
2420 static void startup_children(int number_to_start)
2423 time_t now = time(0);
2425 for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
2426 if (ap_scoreboard_image->servers[i].status != SERVER_DEAD) {
2429 if (make_child(server_conf, i, now) < 0) {
2438 * idle_spawn_rate is the number of children that will be spawned on the
2439 * next maintenance cycle if there aren't enough idle servers. It is
2440 * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
2441 * without the need to spawn.
2443 static int idle_spawn_rate = 1;
2444 #ifndef MAX_SPAWN_RATE
2445 #define MAX_SPAWN_RATE (32)
2447 static int hold_off_on_exponential_spawning;
2449 static void perform_idle_server_maintenance(void)
2455 time_t now = time(0);
2457 int free_slots[MAX_SPAWN_RATE];
2461 /* initialize the free_list */
2469 ap_sync_scoreboard_image();
2470 for (i = 0; i < ap_daemons_limit; ++i) {
2473 if (i >= max_daemons_limit && free_length == idle_spawn_rate)
2475 ss = &ap_scoreboard_image->servers[i];
2476 status = ss->status;
2477 if (status == SERVER_DEAD) {
2478 /* try to keep children numbers as low as possible */
2479 if (free_length < idle_spawn_rate) {
2480 free_slots[free_length] = i;
2485 /* We consider a starting server as idle because we started it
2486 * at least a cycle ago, and if it still hasn't finished starting
2487 * then we're just going to swamp things worse by forking more.
2488 * So we hopefully won't need to fork more if we count it.
2489 * This depends on the ordering of SERVER_READY and SERVER_STARTING.
2491 if (status <= SERVER_READY) {
2493 /* always kill the highest numbered child if we have to...
2494 * no really well thought out reason ... other than observing
2495 * the server behaviour under linux where lower numbered children
2496 * tend to service more hits (and hence are more likely to have
2497 * their data in cpu caches).
2506 max_daemons_limit = last_non_dead + 1;
2507 if (idle_count > ap_daemons_max_free) {
2508 /* kill off one child... we use SIGUSR1 because that'll cause it to
2509 * shut down gracefully, in case it happened to pick up a request
2510 * while we were counting
2512 kill(ap_scoreboard_image->parent[to_kill].pid, SIGUSR1);
2513 idle_spawn_rate = 1;
2515 else if (idle_count < ap_daemons_min_free) {
2516 /* terminate the free list */
2517 if (free_length == 0) {
2518 /* only report this condition once */
2519 static int reported = 0;
2522 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, server_conf,
2523 "server reached MaxClients setting, consider"
2524 " raising the MaxClients setting");
2527 idle_spawn_rate = 1;
2530 if (idle_spawn_rate >= 8) {
2531 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, server_conf,
2532 "server seems busy, (you may need "
2533 "to increase StartServers, or Min/MaxSpareServers), "
2534 "spawning %d children, there are %d idle, and "
2535 "%d total children", idle_spawn_rate,
2536 idle_count, total_non_dead);
2538 for (i = 0; i < free_length; ++i) {
2540 if(make_child(server_conf, free_slots[i], now) == -1) {
2541 if(free_length == 1) {
2542 shutdown_pending = 1;
2543 ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
2544 "No active child processes: shutting down");
2548 make_child(server_conf, free_slots[i], now);
2551 /* the next time around we want to spawn twice as many if this
2552 * wasn't good enough, but not if we've just done a graceful
2554 if (hold_off_on_exponential_spawning) {
2555 --hold_off_on_exponential_spawning;
2557 else if (idle_spawn_rate < MAX_SPAWN_RATE) {
2558 idle_spawn_rate *= 2;
2563 idle_spawn_rate = 1;
2568 static void process_child_status(int pid, ap_wait_t status)
2570 /* Child died... if it died due to a fatal error,
2571 * we should simply bail out.
2573 if ((WIFEXITED(status)) &&
2574 WEXITSTATUS(status) == APEXIT_CHILDFATAL) {
2575 ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_NOERRNO, server_conf,
2576 "Child %d returned a Fatal error... \n"
2577 "Apache is exiting!",
2579 exit(APEXIT_CHILDFATAL);
2581 if (WIFSIGNALED(status)) {
2582 switch (WTERMSIG(status)) {
2591 if (WCOREDUMP(status)) {
2592 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
2594 "child pid %d exit signal %s (%d), "
2595 "possible coredump in %s",
2596 pid, (WTERMSIG(status) >= NumSIG) ? "" :
2597 SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status),
2602 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
2604 "child pid %d exit signal %s (%d)", pid,
2605 SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status));
2610 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
2612 "child pid %d exit signal %d",
2613 pid, WTERMSIG(status));
2620 static int setup_listeners(pool *pconf, server_rec *s)
2624 if (ap_listen_open(pconf, s->port)) {
2625 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, s,
2626 "no listening sockets available, shutting down");
2631 FD_ZERO(&listenfds);
2632 for (lr = ap_listeners; lr; lr = lr->next) {
2633 FD_SET(lr->fd, &listenfds);
2634 if (lr->fd > listenmaxfd) {
2635 listenmaxfd = lr->fd;
2642 /*****************************************************************
2643 * Executive routines.
2646 int ap_mpm_run(pool *_pconf, pool *plog, server_rec *s)
2648 int remaining_children_to_start;
2654 ap_log_pid(pconf, ap_pid_fname);
2656 if (setup_listeners(pconf, s)) {
2657 /* XXX: hey, what's the right way for the mpm to indicate a fatal error? */
2661 SAFE_ACCEPT(accept_mutex_init(pconf));
2663 reinit_scoreboard(pconf);
2665 #ifdef SCOREBOARD_FILE
2667 ap_scoreboard_fname = ap_server_root_relative(pconf, ap_scoreboard_fname);
2668 ap_note_cleanups_for_fd(pconf, scoreboard_fd);
2674 if (ap_daemons_max_free < ap_daemons_min_free + 1) /* Don't thrash... */
2675 ap_daemons_max_free = ap_daemons_min_free + 1;
2677 /* If we're doing a graceful_restart then we're going to see a lot
2678 * of children exiting immediately when we get into the main loop
2679 * below (because we just sent them SIGUSR1). This happens pretty
2680 * rapidly... and for each one that exits we'll start a new one until
2681 * we reach at least daemons_min_free. But we may be permitted to
2682 * start more than that, so we'll just keep track of how many we're
2683 * supposed to start up without the 1 second penalty between each fork.
2685 remaining_children_to_start = ap_daemons_to_start;
2686 if (remaining_children_to_start > ap_daemons_limit) {
2687 remaining_children_to_start = ap_daemons_limit;
2690 startup_children(remaining_children_to_start);
2691 remaining_children_to_start = 0;
2694 /* give the system some time to recover before kicking into
2695 * exponential mode */
2696 hold_off_on_exponential_spawning = 10;
2699 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
2700 "%s configured -- resuming normal operations",
2701 ap_get_server_version());
2702 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, server_conf,
2703 "Server built: %s", ap_get_server_built());
2704 restart_pending = shutdown_pending = 0;
2706 while (!restart_pending && !shutdown_pending) {
2709 int pid = wait_or_timeout(&status);
2711 /* XXX: if it takes longer than 1 second for all our children
2712 * to start up and get into IDLE state then we may spawn an
2716 process_child_status(pid, status);
2717 /* non-fatal death... note that it's gone in the scoreboard. */
2718 ap_sync_scoreboard_image();
2719 child_slot = find_child_by_pid(pid);
2720 if (child_slot >= 0) {
2721 (void) ap_update_child_status(child_slot, SERVER_DEAD,
2722 (request_rec *) NULL);
2723 if (remaining_children_to_start
2724 && child_slot < ap_daemons_limit) {
2725 /* we're still doing a 1-for-1 replacement of dead
2726 * children with new children
2728 make_child(server_conf, child_slot, time(0));
2729 --remaining_children_to_start;
2731 #ifdef HAS_OTHER_CHILD
2733 else if (reap_other_child(pid, status) == 0) {
2737 else if (is_graceful) {
2738 /* Great, we've probably just lost a slot in the
2739 * scoreboard. Somehow we don't know about this
2742 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, server_conf,
2743 "long lost child came home! (pid %d)", pid);
2745 /* Don't perform idle maintenance when a child dies,
2746 * only do it when there's a timeout. Remember only a
2747 * finite number of children can die, and it's pretty
2748 * pathological for a lot to die suddenly.
2752 else if (remaining_children_to_start) {
2753 /* we hit a 1 second timeout in which none of the previous
2754 * generation of children needed to be reaped... so assume
2755 * they're all done, and pick up the slack if any is left.
2757 startup_children(remaining_children_to_start);
2758 remaining_children_to_start = 0;
2759 /* In any event we really shouldn't do the code below because
2760 * few of the servers we just started are in the IDLE state
2761 * yet, so we'd mistakenly create an extra server.
2766 perform_idle_server_maintenance();
2768 shutdown_pending = os_check_server(tpf_server_name);
2774 if (shutdown_pending) {
2775 /* Time to gracefully shut down:
2776 * Kill child processes, tell them to call child_exit, etc...
2778 if (ap_killpg(getpgrp(), SIGTERM) < 0) {
2779 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "killpg SIGTERM");
2781 reclaim_child_processes(1); /* Start with SIGTERM */
2783 /* cleanup pid file on normal shutdown */
2785 const char *pidfile = NULL;
2786 pidfile = ap_server_root_relative (pconf, ap_pid_fname);
2787 if ( pidfile != NULL && unlink(pidfile) == 0)
2788 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO,
2790 "removed PID file %s (pid=%ld)",
2791 pidfile, (long)getpid());
2794 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
2795 "caught SIGTERM, shutting down");
2799 /* we've been told to restart */
2800 signal(SIGHUP, SIG_IGN);
2801 signal(SIGUSR1, SIG_IGN);
2804 /* not worth thinking about */
2808 /* advance to the next generation */
2809 /* XXX: we really need to make sure this new generation number isn't in
2810 * use by any of the children.
2813 ap_scoreboard_image->global.running_generation = ap_my_generation;
2814 update_scoreboard_global();
2817 #ifndef SCOREBOARD_FILE
2820 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
2821 "SIGUSR1 received. Doing graceful restart");
2823 /* kill off the idle ones */
2824 if (ap_killpg(getpgrp(), SIGUSR1) < 0) {
2825 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "killpg SIGUSR1");
2827 #ifndef SCOREBOARD_FILE
2828 /* This is mostly for debugging... so that we know what is still
2829 * gracefully dealing with existing request. But we can't really
2830 * do it if we're in a SCOREBOARD_FILE because it'll cause
2831 * corruption too easily.
2833 ap_sync_scoreboard_image();
2834 for (i = 0; i < ap_daemons_limit; ++i) {
2835 if (ap_scoreboard_image->servers[i].status != SERVER_DEAD) {
2836 ap_scoreboard_image->servers[i].status = SERVER_GRACEFUL;
2843 if (ap_killpg(getpgrp(), SIGHUP) < 0) {
2844 ap_log_error(APLOG_MARK, APLOG_WARNING, server_conf, "killpg SIGHUP");
2846 reclaim_child_processes(0); /* Not when just starting up */
2847 ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, server_conf,
2848 "SIGHUP received. Attempting to restart");
2852 ap_restart_time = time(NULL);
2858 static void prefork_pre_command_line(pool *pcommands)
2864 /* TODO: set one_process properly */ one_process = 0;
2867 static void prefork_pre_config(pool *pconf, pool *plog, pool *ptemp)
2869 static int restart_num = 0;
2871 one_process = ap_exists_config_define("ONE_PROCESS");
2873 /* sigh, want this only the second time around */
2874 if (restart_num++ == 1) {
2885 ap_listen_pre_config();
2886 ap_daemons_to_start = DEFAULT_START_DAEMON;
2887 ap_daemons_min_free = DEFAULT_MIN_FREE_DAEMON;
2888 ap_daemons_max_free = DEFAULT_MAX_FREE_DAEMON;
2889 ap_daemons_limit = HARD_SERVER_LIMIT;
2890 ap_pid_fname = DEFAULT_PIDLOG;
2891 ap_scoreboard_fname = DEFAULT_SCOREBOARD;
2892 ap_lock_fname = DEFAULT_LOCKFILE;
2893 ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
2894 ap_extended_status = 0;
2896 ap_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
2899 static const char *set_pidfile(cmd_parms *cmd, void *dummy, char *arg)
2901 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2906 if (cmd->server->is_virtual) {
2907 return "PidFile directive not allowed in <VirtualHost>";
2913 static const char *set_scoreboard(cmd_parms *cmd, void *dummy, char *arg)
2915 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2920 ap_scoreboard_fname = arg;
2924 static const char *set_lockfile(cmd_parms *cmd, void *dummy, char *arg)
2926 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2931 ap_lock_fname = arg;
2935 static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy, char *arg)
2937 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2942 ap_daemons_to_start = atoi(arg);
2946 static const char *set_min_free_servers(cmd_parms *cmd, void *dummy, char *arg)
2948 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2953 ap_daemons_min_free = atoi(arg);
2954 if (ap_daemons_min_free <= 0) {
2955 fprintf(stderr, "WARNING: detected MinSpareServers set to non-positive.\n");
2956 fprintf(stderr, "Resetting to 1 to avoid almost certain Apache failure.\n");
2957 fprintf(stderr, "Please read the documentation.\n");
2958 ap_daemons_min_free = 1;
2964 static const char *set_max_free_servers(cmd_parms *cmd, void *dummy, char *arg)
2966 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2971 ap_daemons_max_free = atoi(arg);
2975 static const char *set_server_limit (cmd_parms *cmd, void *dummy, char *arg)
2977 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
2982 ap_daemons_limit = atoi(arg);
2983 if (ap_daemons_limit > HARD_SERVER_LIMIT) {
2984 fprintf(stderr, "WARNING: MaxClients of %d exceeds compile time limit "
2985 "of %d servers,\n", ap_daemons_limit, HARD_SERVER_LIMIT);
2986 fprintf(stderr, " lowering MaxClients to %d. To increase, please "
2987 "see the\n", HARD_SERVER_LIMIT);
2988 fprintf(stderr, " HARD_SERVER_LIMIT define in src/include/httpd.h.\n");
2989 ap_daemons_limit = HARD_SERVER_LIMIT;
2991 else if (ap_daemons_limit < 1) {
2992 fprintf(stderr, "WARNING: Require MaxClients > 0, setting to 1\n");
2993 ap_daemons_limit = 1;
2998 static const char *set_max_requests(cmd_parms *cmd, void *dummy, char *arg)
3000 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
3005 ap_max_requests_per_child = atoi(arg);
3010 static const char *set_coredumpdir (cmd_parms *cmd, void *dummy, char *arg)
3014 const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
3019 fname = ap_server_root_relative(cmd->pool, arg);
3020 /* ZZZ change this to the AP func FileInfo*/
3021 if ((stat(fname, &finfo) == -1) || !S_ISDIR(finfo.st_mode)) {
3022 return ap_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
3023 " does not exist or is not a directory", NULL);
3025 ap_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir));
3029 /* there are no threads in the prefork model, so the mutexes are
3031 /* TODO: make these #defines to eliminate the function call */
3033 struct ap_thread_mutex {
3037 API_EXPORT(ap_thread_mutex *) ap_thread_mutex_new(void)
3039 return malloc(sizeof(ap_thread_mutex));
3042 API_EXPORT(void) ap_thread_mutex_lock(ap_thread_mutex *mtx)
3046 API_EXPORT(void) ap_thread_mutex_unlock(ap_thread_mutex *mtx)
3050 API_EXPORT(void) ap_thread_mutex_destroy(ap_thread_mutex *mtx)
3056 static const command_rec prefork_cmds[] = {
3057 UNIX_DAEMON_COMMANDS
3059 { "PidFile", set_pidfile, NULL, RSRC_CONF, TAKE1,
3060 "A file for logging the server process ID"},
3061 { "ScoreBoardFile", set_scoreboard, NULL, RSRC_CONF, TAKE1,
3062 "A file for Apache to maintain runtime process management information"},
3063 { "LockFile", set_lockfile, NULL, RSRC_CONF, TAKE1,
3064 "The lockfile used when Apache needs to lock the accept() call"},
3065 { "StartServers", set_daemons_to_start, NULL, RSRC_CONF, TAKE1,
3066 "Number of child processes launched at server startup" },
3067 { "MinSpareServers", set_min_free_servers, NULL, RSRC_CONF, TAKE1,
3068 "Minimum number of idle children, to handle request spikes" },
3069 { "MaxSpareServers", set_max_free_servers, NULL, RSRC_CONF, TAKE1,
3070 "Maximum number of idle children" },
3071 { "MaxClients", set_server_limit, NULL, RSRC_CONF, TAKE1,
3072 "Maximum number of children alive at the same time" },
3073 { "MaxRequestsPerChild", set_max_requests, NULL, RSRC_CONF, TAKE1,
3074 "Maximum number of requests a particular child serves before dying." },
3075 { "CoreDumpDirectory", set_coredumpdir, NULL, RSRC_CONF, TAKE1,
3076 "The location of the directory Apache changes to before dumping core" },
3080 module MODULE_VAR_EXPORT mpm_prefork_module = {
3081 STANDARD20_MODULE_STUFF,
3082 prefork_pre_command_line, /* pre_command_line */
3083 prefork_pre_config, /* pre_config */
3084 NULL, /* post_config */
3085 NULL, /* open_logs */
3086 NULL, /* child_init */
3087 NULL, /* create per-directory config structure */
3088 NULL, /* merge per-directory config structures */
3089 NULL, /* create per-server config structure */
3090 NULL, /* merge per-server config structures */
3091 prefork_cmds, /* command table */
3092 NULL, /* handlers */
3093 NULL, /* check auth */
3094 NULL, /* check access */
3095 NULL /* register hooks */