Google Git
Sign in
apache / httpd / ace2bda104d19b38af01811c8b9aa427af318c75 / . / server / mpm / prefork / prefork.c
blob: 3c68849ccaed199a644ed8ddf0258401336d724c [file] [log] [blame]
/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* Portions of this software are based upon public domain software
* originally written at the National Center for Supercomputing Applications,
* University of Illinois, Urbana-Champaign.
*/
/*
* httpd.c: simple http daemon for answering WWW file requests
*
*
* 03-21-93 Rob McCool wrote original code (up to NCSA HTTPd 1.3)
*
* 03-06-95 blong
* changed server number for child-alone processes to 0 and changed name
* of processes
*
* 03-10-95 blong
* Added numerous speed hacks proposed by Robert S. Thau (rst@ai.mit.edu)
* including set group before fork, and call gettime before to fork
* to set up libraries.
*
* 04-14-95 rst / rh
* Brandon's code snarfed from NCSA 1.4, but tinkered to work with the
* Apache server, and also to have child processes do accept() directly.
*
* April-July '95 rst
* Extensive rework for Apache.
*/
/* TODO: this is a cobbled together prefork MPM example... it should mostly
* TODO: behave like apache-1.3... here's a short list of things I think
* TODO: need cleaning up still:
* TODO: - clean up scoreboard stuff when we figure out how to do it in 2.0
*/
#define CORE_PRIVATE
#include "ap_config.h"
#include "apr_portable.h"
#include "httpd.h"
#include "mpm_default.h"
#include "mpm_status.h"
#include "http_main.h"
#include "http_log.h"
#include "http_config.h"
#include "http_core.h" /* for get_remote_host */
#include "http_connection.h"
#include "scoreboard.h"
#include "ap_mpm.h"
#include "unixd.h"
#include "iol_socket.h"
#include "ap_listen.h"
#include "ap_mmn.h"
#include <sys/times.h>
#include <sys/types.h>
#include <sys/wait.h>
#ifdef HAVE_BSTRING_H
#include <bstring.h> /* for IRIX, FD_SET calls bzero() */
#endif
#include <signal.h>
/* config globals */
static int ap_max_requests_per_child=0;
static char *ap_pid_fname=NULL;
static char *ap_scoreboard_fname=NULL;
static char *ap_lock_fname;
static int ap_daemons_to_start=0;
static int ap_daemons_min_free=0;
static int ap_daemons_max_free=0;
static int ap_daemons_limit=0;
static time_t ap_restart_time=0;
static int ap_extended_status = 0;
static int maintain_connection_status = 1;
/*
* The max child slot ever assigned, preserved across restarts. Necessary
* to deal with MaxClients changes across SIGUSR1 restarts. We use this
* value to optimize routines that have to scan the entire scoreboard.
*/
static int max_daemons_limit = -1;
static char ap_coredump_dir[MAX_STRING_LEN];
/* *Non*-shared http_main globals... */
static server_rec *server_conf;
static ap_socket_t *sd;
static fd_set listenfds;
static int listenmaxfd;
/* one_process --- debugging mode variable; can be set from the command line
* with the -X flag. If set, this gets you the child_main loop running
* in the process which originally started up (no detach, no make_child),
* which is a pretty nice debugging environment. (You'll get a SIGHUP
* early in standalone_main; just continue through. This is the server
* trying to kill off any child processes which it might have lying
* around --- Apache doesn't keep track of their pids, it just sends
* SIGHUP to the process group, ignoring it in the root process.
* Continue through and you'll be fine.).
*/
static int one_process = 0;
static ap_pool_t *pconf; /* Pool for config stuff */
static ap_pool_t *pchild; /* Pool for httpd child stuff */
static int my_pid; /* it seems silly to call getpid all the time */
#ifndef MULTITHREAD
static int my_child_num;
#endif
#ifdef TPF
int tpf_child = 0;
char tpf_server_name[INETD_SERVNAME_LENGTH+1];
#endif /* TPF */
API_VAR_EXPORT scoreboard *ap_scoreboard_image = NULL;
static new_scoreboard *ap_new_scoreboard_image = NULL;
#ifdef GPROF
/*
* change directory for gprof to plop the gmon.out file
* configure in httpd.conf:
* GprofDir logs/ -> $ServerRoot/logs/gmon.out
* GprofDir logs/% -> $ServerRoot/logs/gprof.$pid/gmon.out
*/
static void chdir_for_gprof(void)
{
core_server_config *sconf =
ap_get_module_config(server_conf->module_config, &core_module);
char *dir = sconf->gprof_dir;
if(dir) {
char buf[512];
int len = strlen(sconf->gprof_dir) - 1;
if(*(dir + len) == '%') {
dir[len] = '\0';
ap_snprintf(buf, sizeof(buf), "%sgprof.%d", dir, (int)getpid());
}
dir = ap_server_root_relative(pconf, buf[0] ? buf : dir);
if(mkdir(dir, 0755) < 0 && errno != EEXIST) {
ap_log_error(APLOG_MARK, APLOG_ERR, errno, server_conf,
"gprof: error creating directory %s", dir);
}
}
else {
dir = ap_server_root_relative(pconf, "logs");
}
chdir(dir);
}
#else
#define chdir_for_gprof()
#endif
/* XXX - I don't know if TPF will ever use this module or not, so leave
* the ap_check_signals calls in but disable them - manoj */
#define ap_check_signals()
/* a clean exit from a child with proper cleanup */
static void clean_child_exit(int code) __attribute__ ((noreturn));
static void clean_child_exit(int code)
{
if (pchild) {
ap_destroy_pool(pchild);
}
chdir_for_gprof();
exit(code);
}
#if defined(USE_FCNTL_SERIALIZED_ACCEPT) || defined(USE_FLOCK_SERIALIZED_ACCEPT)
static void expand_lock_fname(ap_pool_t *p)
{
/* XXXX possibly bogus cast */
ap_lock_fname = ap_psprintf(p, "%s.%lu",
ap_server_root_relative(p, ap_lock_fname), (unsigned long)getpid());
}
#endif
#if defined (USE_USLOCK_SERIALIZED_ACCEPT)
#include <ulocks.h>
static ulock_t uslock = NULL;
#define accept_mutex_child_init(x)
static void accept_mutex_init(ap_pool_t *p)
{
ptrdiff_t old;
usptr_t *us;
/* default is 8, allocate enough for all the children plus the parent */
if ((old = usconfig(CONF_INITUSERS, HARD_SERVER_LIMIT + 1)) == -1) {
perror("usconfig(CONF_INITUSERS)");
exit(-1);
}
if ((old = usconfig(CONF_LOCKTYPE, US_NODEBUG)) == -1) {
perror("usconfig(CONF_LOCKTYPE)");
exit(-1);
}
if ((old = usconfig(CONF_ARENATYPE, US_SHAREDONLY)) == -1) {
perror("usconfig(CONF_ARENATYPE)");
exit(-1);
}
if ((us = usinit("/dev/zero")) == NULL) {
perror("usinit");
exit(-1);
}
if ((uslock = usnewlock(us)) == NULL) {
perror("usnewlock");
exit(-1);
}
}
static void accept_mutex_on(void)
{
switch (ussetlock(uslock)) {
case 1:
/* got lock */
break;
case 0:
ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
"didn't get lock");
clean_child_exit(APEXIT_CHILDFATAL);
case -1:
perror("ussetlock");
clean_child_exit(APEXIT_CHILDFATAL);
}
}
static void accept_mutex_off(void)
{
if (usunsetlock(uslock) == -1) {
perror("usunsetlock");
clean_child_exit(APEXIT_CHILDFATAL);
}
}
#elif defined (USE_PTHREAD_SERIALIZED_ACCEPT)
/* This code probably only works on Solaris ... but it works really fast
* on Solaris. Note that pthread mutexes are *NOT* released when a task
* dies ... the task has to free it itself. So we block signals and
* try to be nice about releasing the mutex.
*/
#include <pthread.h>
static pthread_mutex_t *accept_mutex = (void *)(caddr_t) -1;
static int have_accept_mutex;
static sigset_t accept_block_mask;
static sigset_t accept_previous_mask;
static void accept_mutex_child_cleanup(void *foo)
{
if (accept_mutex != (void *)(caddr_t)-1
&& have_accept_mutex) {
pthread_mutex_unlock(accept_mutex);
}
}
static void accept_mutex_child_init(ap_pool_t *p)
{
ap_register_cleanup(p, NULL, accept_mutex_child_cleanup, ap_null_cleanup);
}
static void accept_mutex_cleanup(void *foo)
{
if (accept_mutex != (void *)(caddr_t)-1
&& munmap((caddr_t) accept_mutex, sizeof(*accept_mutex))) {
perror("munmap");
}
accept_mutex = (void *)(caddr_t)-1;
}
static void accept_mutex_init(ap_pool_t *p)
{
pthread_mutexattr_t mattr;
int fd;
fd = open("/dev/zero", O_RDWR);
if (fd == -1) {
perror("open(/dev/zero)");
exit(APEXIT_INIT);
}
accept_mutex = (pthread_mutex_t *) mmap((caddr_t) 0, sizeof(*accept_mutex),
PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (accept_mutex == (void *) (caddr_t) - 1) {
perror("mmap");
exit(APEXIT_INIT);
}
close(fd);
if ((errno = pthread_mutexattr_init(&mattr))) {
perror("pthread_mutexattr_init");
exit(APEXIT_INIT);
}
if ((errno = pthread_mutexattr_setpshared(&mattr,
PTHREAD_PROCESS_SHARED))) {
perror("pthread_mutexattr_setpshared");
exit(APEXIT_INIT);
}
if ((errno = pthread_mutex_init(accept_mutex, &mattr))) {
perror("pthread_mutex_init");
exit(APEXIT_INIT);
}
sigfillset(&accept_block_mask);
sigdelset(&accept_block_mask, SIGHUP);
sigdelset(&accept_block_mask, SIGTERM);
sigdelset(&accept_block_mask, SIGUSR1);
ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
}
static void accept_mutex_on(void)
{
int err;
if (sigprocmask(SIG_BLOCK, &accept_block_mask, &accept_previous_mask)) {
perror("sigprocmask(SIG_BLOCK)");
clean_child_exit(APEXIT_CHILDFATAL);
}
if ((err = pthread_mutex_lock(accept_mutex))) {
errno = err;
perror("pthread_mutex_lock");
clean_child_exit(APEXIT_CHILDFATAL);
}
have_accept_mutex = 1;
}
static void accept_mutex_off(void)
{
int err;
if ((err = pthread_mutex_unlock(accept_mutex))) {
errno = err;
perror("pthread_mutex_unlock");
clean_child_exit(APEXIT_CHILDFATAL);
}
/* There is a slight race condition right here... if we were to die right
* now, we'd do another pthread_mutex_unlock. Now, doing that would let
* another process into the mutex. pthread mutexes are designed to be
* fast, as such they don't have protection for things like testing if the
* thread owning a mutex is actually unlocking it (or even any way of
* testing who owns the mutex).
*
* If we were to unset have_accept_mutex prior to releasing the mutex
* then the race could result in the server unable to serve hits. Doing
* it this way means that the server can continue, but an additional
* child might be in the critical section ... at least it's still serving
* hits.
*/
have_accept_mutex = 0;
if (sigprocmask(SIG_SETMASK, &accept_previous_mask, NULL)) {
perror("sigprocmask(SIG_SETMASK)");
clean_child_exit(1);
}
}
#elif defined (USE_SYSVSEM_SERIALIZED_ACCEPT)
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#ifdef NEED_UNION_SEMUN
/* it makes no sense, but this isn't defined on solaris */
union semun {
long val;
struct semid_ds *buf;
ushort *array;
};
#endif
static int sem_id = -1;
static struct sembuf op_on;
static struct sembuf op_off;
/* We get a random semaphore ... the lame sysv semaphore interface
* means we have to be sure to clean this up or else we'll leak
* semaphores.
*/
static void accept_mutex_cleanup(void *foo)
{
union semun ick;
if (sem_id < 0)
return;
/* this is ignored anyhow */
ick.val = 0;
semctl(sem_id, 0, IPC_RMID, ick);
}
#define accept_mutex_child_init(x)
static void accept_mutex_init(ap_pool_t *p)
{
union semun ick;
struct semid_ds buf;
/* acquire the semaphore */
sem_id = semget(IPC_PRIVATE, 1, IPC_CREAT | 0600);
if (sem_id < 0) {
perror("semget");
exit(APEXIT_INIT);
}
ick.val = 1;
if (semctl(sem_id, 0, SETVAL, ick) < 0) {
perror("semctl(SETVAL)");
exit(APEXIT_INIT);
}
if (!getuid()) {
/* restrict it to use only by the appropriate user_id ... not that this
* stops CGIs from acquiring it and dinking around with it.
*/
buf.sem_perm.uid = unixd_config.user_id;
buf.sem_perm.gid = unixd_config.group_id;
buf.sem_perm.mode = 0600;
ick.buf = &buf;
if (semctl(sem_id, 0, IPC_SET, ick) < 0) {
perror("semctl(IPC_SET)");
exit(APEXIT_INIT);
}
}
ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
/* preinitialize these */
op_on.sem_num = 0;
op_on.sem_op = -1;
op_on.sem_flg = SEM_UNDO;
op_off.sem_num = 0;
op_off.sem_op = 1;
op_off.sem_flg = SEM_UNDO;
}
static void accept_mutex_on(void)
{
while (semop(sem_id, &op_on, 1) < 0) {
if (errno != EINTR) {
perror("accept_mutex_on");
clean_child_exit(APEXIT_CHILDFATAL);
}
}
}
static void accept_mutex_off(void)
{
while (semop(sem_id, &op_off, 1) < 0) {
if (errno != EINTR) {
perror("accept_mutex_off");
clean_child_exit(APEXIT_CHILDFATAL);
}
}
}
#elif defined(USE_FCNTL_SERIALIZED_ACCEPT)
static struct flock lock_it;
static struct flock unlock_it;
static int lock_fd = -1;
#define accept_mutex_child_init(x)
/*
* Initialize mutex lock.
* Must be safe to call this on a restart.
*/
static void accept_mutex_init(ap_pool_t *p)
{
ap_file_t *tempfile = NULL;
lock_it.l_whence = SEEK_SET; /* from current point */
lock_it.l_start = 0; /* -"- */
lock_it.l_len = 0; /* until end of file */
lock_it.l_type = F_WRLCK; /* set exclusive/write lock */
lock_it.l_pid = 0; /* pid not actually interesting */
unlock_it.l_whence = SEEK_SET; /* from current point */
unlock_it.l_start = 0; /* -"- */
unlock_it.l_len = 0; /* until end of file */
unlock_it.l_type = F_UNLCK; /* set exclusive/write lock */
unlock_it.l_pid = 0; /* pid not actually interesting */
expand_lock_fname(p);
ap_open(&tempfile, ap_lock_fname, APR_CREATE | APR_WRITE | APR_EXCL,
APR_UREAD | APR_UWRITE | APR_GREAD | APR_WREAD, p);
ap_get_os_file(&lock_fd, tempfile);
if (lock_fd == -1) {
perror("open");
ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
"Cannot open lock file: %s", ap_lock_fname);
exit(APEXIT_INIT);
}
unlink(ap_lock_fname);
}
static void accept_mutex_on(void)
{
int ret;
while ((ret = fcntl(lock_fd, F_SETLKW, &lock_it)) < 0 && errno == EINTR) {
/* nop */
}
if (ret < 0) {
ap_log_error(APLOG_MARK, APLOG_EMERG, errno, server_conf,
"fcntl: F_SETLKW: Error getting accept lock, exiting! "
"Perhaps you need to use the LockFile directive to place "
"your lock file on a local disk!");
clean_child_exit(APEXIT_CHILDFATAL);
}
}
static void accept_mutex_off(void)
{
int ret;
while ((ret = fcntl(lock_fd, F_SETLKW, &unlock_it)) < 0 && errno == EINTR) {
/* nop */
}
if (ret < 0) {
ap_log_error(APLOG_MARK, APLOG_EMERG, errno, server_conf,
"fcntl: F_SETLKW: Error freeing accept lock, exiting! "
"Perhaps you need to use the LockFile directive to place "
"your lock file on a local disk!");
clean_child_exit(APEXIT_CHILDFATAL);
}
}
#elif defined(USE_FLOCK_SERIALIZED_ACCEPT)
static int lock_fd = -1;
static ap_status_t accept_mutex_cleanup(void *foo)
{
unlink(ap_lock_fname);
return APR_SUCCESS;
}
/*
* Initialize mutex lock.
* Done by each child at it's birth
*/
static void accept_mutex_child_init(ap_pool_t *p)
{
ap_file_t *tempfile = NULL;
ap_status_t ret;
ret=ap_open(&tempfile, ap_lock_fname, APR_WRITE, APR_UREAD|APR_UWRITE, p);
if (ret != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_EMERG, ret, server_conf,
"Child cannot open lock file: %s", ap_lock_fname);
clean_child_exit(APEXIT_CHILDINIT);
}
ap_get_os_file(&lock_fd, tempfile);
}
/*
* Initialize mutex lock.
* Must be safe to call this on a restart.
*/
static void accept_mutex_init(ap_pool_t *p)
{
ap_file_t *tempfile = NULL;
ap_status_t ret;
expand_lock_fname(p);
unlink(ap_lock_fname);
ret=ap_open(&tempfile, ap_lock_fname, APR_CREATE|APR_WRITE|APR_EXCL,
APR_UREAD|APR_UWRITE, p);
if (ret != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_EMERG, ret, server_conf,
"Parent cannot open lock file: %s", ap_lock_fname);
exit(APEXIT_INIT);
}
ap_get_os_file(&lock_fd, tempfile);
ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
}
static void accept_mutex_on(void)
{
int ret;
while ((ret = flock(lock_fd, LOCK_EX)) < 0 && errno == EINTR)
continue;
if (ret < 0) {
ap_log_error(APLOG_MARK, APLOG_EMERG, errno, server_conf,
"flock: LOCK_EX: Error getting accept lock. Exiting!");
clean_child_exit(APEXIT_CHILDFATAL);
}
}
static void accept_mutex_off(void)
{
if (flock(lock_fd, LOCK_UN) < 0) {
ap_log_error(APLOG_MARK, APLOG_EMERG, errno, server_conf,
"flock: LOCK_UN: Error freeing accept lock. Exiting!");
clean_child_exit(APEXIT_CHILDFATAL);
}
}
#elif defined(USE_OS2SEM_SERIALIZED_ACCEPT)
static HMTX lock_sem = -1;
static void accept_mutex_cleanup(void *foo)
{
DosReleaseMutexSem(lock_sem);
DosCloseMutexSem(lock_sem);
}
/*
* Initialize mutex lock.
* Done by each child at it's birth
*/
static void accept_mutex_child_init(ap_pool_t *p)
{
int rc = DosOpenMutexSem(NULL, &lock_sem);
if (rc != 0) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
"Child cannot open lock semaphore, rc=%d", rc);
clean_child_exit(APEXIT_CHILDINIT);
} else {
ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
}
}
/*
* Initialize mutex lock.
* Must be safe to call this on a restart.
*/
static void accept_mutex_init(ap_pool_t *p)
{
int rc = DosCreateMutexSem(NULL, &lock_sem, DC_SEM_SHARED, FALSE);
if (rc != 0) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
"Parent cannot create lock semaphore, rc=%d", rc);
exit(APEXIT_INIT);
}
ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
}
static void accept_mutex_on(void)
{
int rc = DosRequestMutexSem(lock_sem, SEM_INDEFINITE_WAIT);
if (rc != 0) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
"OS2SEM: Error %d getting accept lock. Exiting!", rc);
clean_child_exit(APEXIT_CHILDFATAL);
}
}
static void accept_mutex_off(void)
{
int rc = DosReleaseMutexSem(lock_sem);
if (rc != 0) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_EMERG, server_conf,
"OS2SEM: Error %d freeing accept lock. Exiting!", rc);
clean_child_exit(APEXIT_CHILDFATAL);
}
}
#elif defined(USE_TPF_CORE_SERIALIZED_ACCEPT)
static int tpf_core_held;
static void accept_mutex_cleanup(void *foo)
{
if(tpf_core_held)
coruc(RESOURCE_KEY);
}
#define accept_mutex_init(x)
static void accept_mutex_child_init(ap_pool_t *p)
{
ap_register_cleanup(p, NULL, accept_mutex_cleanup, ap_null_cleanup);
tpf_core_held = 0;
}
static void accept_mutex_on(void)
{
corhc(RESOURCE_KEY);
tpf_core_held = 1;
ap_check_signals();
}
static void accept_mutex_off(void)
{
coruc(RESOURCE_KEY);
tpf_core_held = 0;
ap_check_signals();
}
#else
/* Default --- no serialization. Other methods *could* go here,
* as #elifs...
*/
#if !defined(MULTITHREAD)
/* Multithreaded systems don't complete between processes for
* the sockets. */
#define NO_SERIALIZED_ACCEPT
#define accept_mutex_child_init(x)
#define accept_mutex_init(x)
#define accept_mutex_on()
#define accept_mutex_off()
#endif
#endif
/* On some architectures it's safe to do unserialized accept()s in the single
* Listen case. But it's never safe to do it in the case where there's
* multiple Listen statements. Define SINGLE_LISTEN_UNSERIALIZED_ACCEPT
* when it's safe in the single Listen case.
*/
#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
#define SAFE_ACCEPT(stmt) do {if (ap_listeners->next) {stmt;}} while(0)
#else
#define SAFE_ACCEPT(stmt) do {stmt;} while(0)
#endif
#if APR_HAS_SHARED_MEMORY
#include "apr_shmem.h"
static ap_shmem_t *scoreboard_shm = NULL;
static ap_status_t cleanup_shared_mem(void *d)
{
ap_shm_free(scoreboard_shm, ap_scoreboard_image);
ap_scoreboard_image = NULL;
ap_shm_destroy(scoreboard_shm);
return APR_SUCCESS;
}
static void setup_shared_mem(ap_pool_t *p)
{
char buf[512];
const char *fname;
fname = ap_server_root_relative(p, ap_scoreboard_fname);
if (ap_shm_init(&scoreboard_shm, SCOREBOARD_SIZE + NEW_SCOREBOARD_SIZE + 40, fname, p) != APR_SUCCESS) {
ap_snprintf(buf, sizeof(buf), "%s: could not open(create) scoreboard",
ap_server_argv0);
perror(buf);
exit(APEXIT_INIT);
}
ap_scoreboard_image = ap_shm_malloc(scoreboard_shm, SCOREBOARD_SIZE);
ap_new_scoreboard_image = ap_shm_malloc(scoreboard_shm, NEW_SCOREBOARD_SIZE);
if (ap_scoreboard_image == NULL) {
ap_snprintf(buf, sizeof(buf), "%s: cannot allocate scoreboard",
ap_server_argv0);
perror(buf);
ap_shm_destroy(scoreboard_shm);
exit(APEXIT_INIT);
}
ap_register_cleanup(p, NULL, cleanup_shared_mem, ap_null_cleanup);
ap_scoreboard_image->global.running_generation = 0;
}
static void reopen_scoreboard(ap_pool_t *p)
{
}
#endif
/* Called by parent process */
static void reinit_scoreboard(ap_pool_t *p)
{
int running_gen = 0;
if (ap_scoreboard_image)
running_gen = ap_scoreboard_image->global.running_generation;
if (ap_scoreboard_image == NULL) {
setup_shared_mem(p);
}
memset(ap_scoreboard_image, 0, SCOREBOARD_SIZE);
ap_scoreboard_image->global.running_generation = running_gen;
}
/* Routines called to deal with the scoreboard image
* --- note that we do *not* need write locks, since update_child_status
* only updates a *single* record in place, and only one process writes to
* a given scoreboard slot at a time (either the child process owning that
* slot, or the parent, noting that the child has died).
*
* As a final note --- setting the score entry to getpid() is always safe,
* since when the parent is writing an entry, it's only noting SERVER_DEAD
* anyway.
*/
ap_inline void ap_sync_scoreboard_image(void)
{
#ifdef SCOREBOARD_FILE
lseek(scoreboard_fd, 0L, 0);
force_read(scoreboard_fd, ap_scoreboard_image, sizeof(*ap_scoreboard_image))
;
#endif
}
API_EXPORT(int) ap_exists_scoreboard_image(void)
{
return (ap_scoreboard_image ? 1 : 0);
}
static ap_inline void put_scoreboard_info(int child_num,
short_score *new_score_rec)
{
#ifdef SCOREBOARD_FILE
lseek(scoreboard_fd, (long) child_num * sizeof(short_score), 0);
force_write(scoreboard_fd, new_score_rec, sizeof(short_score));
#endif
}
int ap_update_child_status(int child_num, int status, request_rec *r)
{
int old_status;
short_score *ss;
if (child_num < 0)
return -1;
ap_check_signals();
ss = &ap_scoreboard_image->servers[child_num];
old_status = ss->status;
ss->status = status;
if (ap_extended_status) {
if (status == SERVER_READY || status == SERVER_DEAD) {
/*
* Reset individual counters
*/
if (status == SERVER_DEAD) {
ss->my_access_count = 0L;
ss->my_bytes_served = 0L;
}
ss->conn_count = (unsigned short) 0;
ss->conn_bytes = (unsigned long) 0;
}
if (r) {
conn_rec *c = r->connection;
ap_cpystrn(ss->client, ap_get_remote_host(c, r->per_dir_config,
REMOTE_NOLOOKUP), sizeof(ss->client));
if (r->the_request == NULL) {
ap_cpystrn(ss->request, "NULL", sizeof(ss->request));
} else if (r->parsed_uri.password == NULL) {
ap_cpystrn(ss->request, r->the_request, sizeof(ss->request));
} else {
/* Don't reveal the password in the server-status view */
ap_cpystrn(ss->request, ap_pstrcat(r->pool, r->method, " ",
ap_unparse_uri_components(r->pool, &r->parsed_uri, UNP_OMITPASSWORD),
r->assbackwards ? NULL : " ", r->protocol, NULL),
sizeof(ss->request));
}
ss->vhostrec = r->server;
}
}
if (status == SERVER_STARTING && r == NULL) {
/* clean up the slot's vhostrec pointer (maybe re-used)
* and mark the slot as belonging to a new generation.
*/
ss->vhostrec = NULL;
ap_scoreboard_image->parent[child_num].generation = ap_my_generation;
#ifdef SCOREBOARD_FILE
lseek(scoreboard_fd, XtOffsetOf(scoreboard, parent[child_num]), 0);
force_write(scoreboard_fd, &ap_scoreboard_image->parent[child_num],
sizeof(parent_score));
#endif
}
put_scoreboard_info(child_num, ss);
return old_status;
}
static void update_scoreboard_global(void)
{
#ifdef SCOREBOARD_FILE
lseek(scoreboard_fd,
(char *) &ap_scoreboard_image->global -(char *) ap_scoreboard_image, 0);
force_write(scoreboard_fd, &ap_scoreboard_image->global,
sizeof ap_scoreboard_image->global);
#endif
}
void ap_time_process_request(int child_num, int status)
{
short_score *ss;
#if !defined(HAVE_GETTIMEOFDAY) && defined(HAVE_TIMES)
struct tms tms_blk;
#endif
if (child_num < 0)
return;
ap_sync_scoreboard_image();
ss = &ap_scoreboard_image->servers[child_num];
if (status == START_PREQUEST) {
#if !defined(HAVE_GETTIMEOFDAY)
#ifdef HAVE_TIMES
if ((ss->start_time = times(&tms_blk)) == -1)
#endif /* HAVE_TIMES */
ss->start_time = (clock_t) 0;
#else
if (gettimeofday(&ss->start_time, (struct timezone *) 0) < 0)
ss->start_time.tv_sec =
ss->start_time.tv_usec = 0L;
#endif
}
else if (status == STOP_PREQUEST) {
#if !defined(HAVE_GETTIMEOFDAY)
#ifdef HAVE_TIMES
if ((ss->stop_time = times(&tms_blk)) == -1)
#endif
ss->stop_time = ss->start_time = (clock_t) 0;
#else
if (gettimeofday(&ss->stop_time, (struct timezone *) 0) < 0)
ss->stop_time.tv_sec =
ss->stop_time.tv_usec =
ss->start_time.tv_sec =
ss->start_time.tv_usec = 0L;
#endif
}
put_scoreboard_info(child_num, ss);
}
/*
static void increment_counts(int child_num, request_rec *r)
{
long int bs = 0;
short_score *ss;
ap_sync_scoreboard_image();
ss = &ap_scoreboard_image->servers[child_num];
if (r->sent_bodyct)
ap_bgetopt(r->connection->client, BO_BYTECT, &bs);
#ifdef HAVE_TIMES
times(&ss->times);
#endif
ss->access_count++;
ss->my_access_count++;
ss->conn_count++;
ss->bytes_served += (unsigned long) bs;
ss->my_bytes_served += (unsigned long) bs;
ss->conn_bytes += (unsigned long) bs;
put_scoreboard_info(child_num, ss);
}
*/
static int find_child_by_pid(int pid)
{
int i;
for (i = 0; i < max_daemons_limit; ++i)
if (ap_scoreboard_image->parent[i].pid == pid)
return i;
return -1;
}
static void reclaim_child_processes(int terminate)
{
#ifndef MULTITHREAD
int i, status;
long int waittime = 1024 * 16; /* in usecs */
struct timeval tv;
int waitret, tries;
int not_dead_yet;
ap_sync_scoreboard_image();
for (tries = terminate ? 4 : 1; tries <= 9; ++tries) {
/* don't want to hold up progress any more than
* necessary, but we need to allow children a few moments to exit.
* Set delay with an exponential backoff.
*/
tv.tv_sec = waittime / 1000000;
tv.tv_usec = waittime % 1000000;
waittime = waittime * 4;
ap_select(0, NULL, NULL, NULL, &tv);
/* now see who is done */
not_dead_yet = 0;
for (i = 0; i < max_daemons_limit; ++i) {
int pid = ap_scoreboard_image->parent[i].pid;
if (pid == my_pid || pid == 0)
continue;
waitret = waitpid(pid, &status, WNOHANG);
if (waitret == pid || waitret == -1) {
ap_scoreboard_image->parent[i].pid = 0;
continue;
}
++not_dead_yet;
switch (tries) {
case 1: /* 16ms */
case 2: /* 82ms */
break;
case 3: /* 344ms */
/* perhaps it missed the SIGHUP, lets try again */
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
0, server_conf,
"child process %d did not exit, sending another SIGHUP",
pid);
kill(pid, SIGHUP);
waittime = 1024 * 16;
break;
case 4: /* 16ms */
case 5: /* 82ms */
case 6: /* 344ms */
break;
case 7: /* 1.4sec */
/* ok, now it's being annoying */
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
0, server_conf,
"child process %d still did not exit, sending a SIGTERM",
pid);
kill(pid, SIGTERM);
break;
case 8: /* 6 sec */
/* die child scum */
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, server_conf,
"child process %d still did not exit, sending a SIGKILL",
pid);
kill(pid, SIGKILL);
break;
case 9: /* 14 sec */
/* gave it our best shot, but alas... If this really
* is a child we are trying to kill and it really hasn't
* exited, we will likely fail to bind to the port
* after the restart.
*/
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, server_conf,
"could not make child process %d exit, "
"attempting to continue anyway", pid);
break;
}
}
ap_check_other_child();
if (!not_dead_yet) {
/* nothing left to wait for */
break;
}
}
#endif /* ndef MULTITHREAD */
}
#if defined(NEED_WAITPID)
/*
Systems without a real waitpid sometimes lose a child's exit while waiting
for another. Search through the scoreboard for missing children.
*/
int reap_children(ap_wait_t *status)
{
int n, pid;
for (n = 0; n < max_daemons_limit; ++n) {
ap_sync_scoreboard_image();
if (ap_scoreboard_image->servers[n].status != SERVER_DEAD &&
kill((pid = ap_scoreboard_image->parent[n].pid), 0) == -1) {
ap_update_child_status(n, SERVER_DEAD, NULL);
/* just mark it as having a successful exit status */
bzero((char *) status, sizeof(ap_wait_t));
return(pid);
}
}
return 0;
}
#endif
/* Finally, this routine is used by the caretaker process to wait for
* a while...
*/
/* number of calls to wait_or_timeout between writable probes */
#ifndef INTERVAL_OF_WRITABLE_PROBES
#define INTERVAL_OF_WRITABLE_PROBES 10
#endif
static int wait_or_timeout_counter;
static int wait_or_timeout(ap_wait_t *status)
{
struct timeval tv;
int ret;
++wait_or_timeout_counter;
if (wait_or_timeout_counter == INTERVAL_OF_WRITABLE_PROBES) {
wait_or_timeout_counter = 0;
#ifdef HAS_OTHER_CHILD
probe_writable_fds();
#endif
}
ret = waitpid(-1, status, WNOHANG);
if (ret == -1 && errno == EINTR) {
return -1;
}
if (ret > 0) {
return ret;
}
#ifdef NEED_WAITPID
if ((ret = reap_children(status)) > 0) {
return ret;
}
#endif
tv.tv_sec = SCOREBOARD_MAINTENANCE_INTERVAL / 1000000;
tv.tv_usec = SCOREBOARD_MAINTENANCE_INTERVAL % 1000000;
ap_select(0, NULL, NULL, NULL, &tv);
return -1;
}
/* handle all varieties of core dumping signals */
static void sig_coredump(int sig)
{
chdir(ap_coredump_dir);
ap_signal(sig, SIG_DFL);
kill(getpid(), sig);
/* At this point we've got sig blocked, because we're still inside
* the signal handler. When we leave the signal handler it will
* be unblocked, and we'll take the signal... and coredump or whatever
* is appropriate for this particular Unix. In addition the parent
* will see the real signal we received -- whereas if we called
* abort() here, the parent would only see SIGABRT.
*/
}
/*****************************************************************
* Connection structures and accounting...
*/
static void just_die(int sig)
{
clean_child_exit(0);
}
static int volatile deferred_die;
static int volatile usr1_just_die;
static void usr1_handler(int sig)
{
if (usr1_just_die) {
just_die(sig);
}
deferred_die = 1;
}
/* volatile just in case */
static int volatile shutdown_pending;
static int volatile restart_pending;
static int volatile is_graceful;
ap_generation_t volatile ap_my_generation=0;
static void sig_term(int sig)
{
if (shutdown_pending == 1) {
/* Um, is this _probably_ not an error, if the user has
* tried to do a shutdown twice quickly, so we won't
* worry about reporting it.
*/
return;
}
shutdown_pending = 1;
}
static void restart(int sig)
{
if (restart_pending == 1) {
/* Probably not an error - don't bother reporting it */
return;
}
restart_pending = 1;
if ((is_graceful = (sig == SIGUSR1))) {
ap_kill_cleanup(pconf, NULL, cleanup_shared_mem);
}
}
static void set_signals(void)
{
#ifndef NO_USE_SIGACTION
struct sigaction sa;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
if (!one_process) {
sa.sa_handler = sig_coredump;
#if defined(SA_ONESHOT)
sa.sa_flags = SA_ONESHOT;
#elif defined(SA_RESETHAND)
sa.sa_flags = SA_RESETHAND;
#endif
if (sigaction(SIGSEGV, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGSEGV)");
#ifdef SIGBUS
if (sigaction(SIGBUS, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGBUS)");
#endif
#ifdef SIGABORT
if (sigaction(SIGABORT, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGABORT)");
#endif
#ifdef SIGABRT
if (sigaction(SIGABRT, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGABRT)");
#endif
#ifdef SIGILL
if (sigaction(SIGILL, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGILL)");
#endif
sa.sa_flags = 0;
}
sa.sa_handler = sig_term;
if (sigaction(SIGTERM, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGTERM)");
#ifdef SIGINT
if (sigaction(SIGINT, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGINT)");
#endif
#ifdef SIGXCPU
sa.sa_handler = SIG_DFL;
if (sigaction(SIGXCPU, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGXCPU)");
#endif
#ifdef SIGXFSZ
sa.sa_handler = SIG_DFL;
if (sigaction(SIGXFSZ, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGXFSZ)");
#endif
#ifdef SIGPIPE
sa.sa_handler = SIG_IGN;
if (sigaction(SIGPIPE, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGPIPE)");
#endif
/* we want to ignore HUPs and USR1 while we're busy processing one */
sigaddset(&sa.sa_mask, SIGHUP);
sigaddset(&sa.sa_mask, SIGUSR1);
sa.sa_handler = restart;
if (sigaction(SIGHUP, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGHUP)");
if (sigaction(SIGUSR1, &sa, NULL) < 0)
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "sigaction(SIGUSR1)");
#else
if (!one_process) {
ap_signal(SIGSEGV, sig_coredump);
#ifdef SIGBUS
ap_signal(SIGBUS, sig_coredump);
#endif /* SIGBUS */
#ifdef SIGABORT
ap_signal(SIGABORT, sig_coredump);
#endif /* SIGABORT */
#ifdef SIGABRT
ap_signal(SIGABRT, sig_coredump);
#endif /* SIGABRT */
#ifdef SIGILL
ap_signal(SIGILL, sig_coredump);
#endif /* SIGILL */
#ifdef SIGXCPU
ap_signal(SIGXCPU, SIG_DFL);
#endif /* SIGXCPU */
#ifdef SIGXFSZ
ap_signal(SIGXFSZ, SIG_DFL);
#endif /* SIGXFSZ */
}
ap_signal(SIGTERM, sig_term);
#ifdef SIGHUP
ap_signal(SIGHUP, restart);
#endif /* SIGHUP */
#ifdef SIGUSR1
ap_signal(SIGUSR1, restart);
#endif /* SIGUSR1 */
#ifdef SIGPIPE
ap_signal(SIGPIPE, SIG_IGN);
#endif /* SIGPIPE */
#endif
}
#if defined(TCP_NODELAY) && !defined(MPE) && !defined(TPF)
static void sock_disable_nagle(int s)
{
/* The Nagle algorithm says that we should delay sending partial
* packets in hopes of getting more data. We don't want to do
* this; we are not telnet. There are bad interactions between
* persistent connections and Nagle's algorithm that have very severe
* performance penalties. (Failing to disable Nagle is not much of a
* problem with simple HTTP.)
*
* In spite of these problems, failure here is not a shooting offense.
*/
int just_say_no = 1;
if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (char *) &just_say_no,
sizeof(int)) < 0) {
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf,
"setsockopt: (TCP_NODELAY)");
}
}
#else
#define sock_disable_nagle(s) /* NOOP */
#endif
/*****************************************************************
* Child process main loop.
* The following vars are static to avoid getting clobbered by longjmp();
* they are really private to child_main.
*/
static int srv;
static ap_socket_t *csd;
static int requests_this_child;
static fd_set main_fds;
int ap_graceful_stop_signalled(void)
{
ap_sync_scoreboard_image();
if (deferred_die ||
ap_scoreboard_image->global.running_generation != ap_my_generation) {
return 1;
}
return 0;
}
static void child_main(int child_num_arg)
{
/* XXX replace int with NET_SIZE_T, this is defined in ap_config.h which
has macros we can't make visible to this file, but it is the original
type for clen.
*/
int clen;
struct sockaddr sa_server;
struct sockaddr sa_client;
ap_listen_rec *lr;
ap_listen_rec *last_lr;
ap_listen_rec *first_lr;
ap_pool_t *ptrans;
conn_rec *current_conn;
ap_iol *iol;
ap_status_t stat;
int sockdes;
my_pid = getpid();
csd = NULL;
my_child_num = child_num_arg;
requests_this_child = 0;
last_lr = NULL;
/* Get a sub context for global allocations in this child, so that
* we can have cleanups occur when the child exits.
*/
ap_create_pool(&pchild, pconf);
ap_create_pool(&ptrans, pchild);
/* needs to be done before we switch UIDs so we have permissions */
reopen_scoreboard(pchild);
SAFE_ACCEPT(accept_mutex_child_init(pchild));
if (unixd_setup_child()) {
clean_child_exit(APEXIT_CHILDFATAL);
}
ap_child_init_hook(pchild, server_conf);
(void) ap_update_child_status(my_child_num, SERVER_READY, (request_rec *) NULL);
ap_signal(SIGHUP, just_die);
ap_signal(SIGTERM, just_die);
#ifdef OS2
/* Stop Ctrl-C/Ctrl-Break signals going to child processes */
{
unsigned long ulTimes;
DosSetSignalExceptionFocus(0, &ulTimes);
}
#endif
while (!ap_graceful_stop_signalled()) {
BUFF *conn_io;
/* Prepare to receive a SIGUSR1 due to graceful restart so that
* we can exit cleanly.
*/
usr1_just_die = 1;
ap_signal(SIGUSR1, usr1_handler);
/*
* (Re)initialize this child to a pre-connection state.
*/
current_conn = NULL;
ap_clear_pool(ptrans);
if ((ap_max_requests_per_child > 0
&& requests_this_child++ >= ap_max_requests_per_child)) {
clean_child_exit(0);
}
(void) ap_update_child_status(my_child_num, SERVER_READY, (request_rec *) NULL);
/*
* Wait for an acceptable connection to arrive.
*/
/* Lock around "accept", if necessary */
SAFE_ACCEPT(accept_mutex_on());
for (;;) {
if (ap_listeners->next) {
/* more than one socket */
memcpy(&main_fds, &listenfds, sizeof(fd_set));
srv = ap_select(listenmaxfd + 1, &main_fds, NULL, NULL, NULL);
if (srv < 0 && errno != EINTR) {
/* Single Unix documents select as returning errnos
* EBADF, EINTR, and EINVAL... and in none of those
* cases does it make sense to continue. In fact
* on Linux 2.0.x we seem to end up with EFAULT
* occasionally, and we'd loop forever due to it.
*/
ap_log_error(APLOG_MARK, APLOG_ERR, errno, server_conf, "select: (listen)");
clean_child_exit(1);
}
if (srv <= 0)
continue;
/* we remember the last_lr we searched last time around so that
we don't end up starving any particular listening socket */
if (last_lr == NULL) {
lr = ap_listeners;
}
else {
lr = last_lr->next;
if (!lr)
lr = ap_listeners;
}
first_lr=lr;
do {
ap_get_os_sock(&sockdes, lr->sd);
if (FD_ISSET(sockdes, &main_fds))
goto got_listener;
lr = lr->next;
if (!lr)
lr = ap_listeners;
}
while (lr != first_lr);
/* FIXME: if we get here, something bad has happened, and we're
probably gonna spin forever.
*/
continue;
got_listener:
last_lr = lr;
sd = lr->sd;
}
else {
/* only one socket, just pretend we did the other stuff */
sd = ap_listeners->sd;
}
/* if we accept() something we don't want to die, so we have to
* defer the exit
*/
usr1_just_die = 0;
for (;;) {
if (deferred_die) {
/* we didn't get a socket, and we were told to die */
clean_child_exit(0);
}
clen = sizeof(sa_client);
stat = ap_accept(&csd, sd, ptrans);
if (stat == APR_SUCCESS || stat != APR_EINTR)
break;
}
if (stat == APR_SUCCESS)
break; /* We have a socket ready for reading */
else {
/* TODO: this accept result handling stuff should be abstracted...
* it's already out of date between the various unix mpms
*/
/* Our old behaviour here was to continue after accept()
* errors. But this leads us into lots of troubles
* because most of the errors are quite fatal. For
* example, EMFILE can be caused by slow descriptor
* leaks (say in a 3rd party module, or libc). It's
* foolish for us to continue after an EMFILE. We also
* seem to tickle kernel bugs on some platforms which
* lead to never-ending loops here. So it seems best
* to just exit in most cases.
*/
switch (errno) {
#ifdef EPROTO
/* EPROTO on certain older kernels really means
* ECONNABORTED, so we need to ignore it for them.
* See discussion in new-httpd archives nh.9701
* search for EPROTO.
*
* Also see nh.9603, search for EPROTO:
* There is potentially a bug in Solaris 2.x x<6,
* and other boxes that implement tcp sockets in
* userland (i.e. on top of STREAMS). On these
* systems, EPROTO can actually result in a fatal
* loop. See PR#981 for example. It's hard to
* handle both uses of EPROTO.
*/
case EPROTO:
#endif
#ifdef ECONNABORTED
case ECONNABORTED:
#endif
/* Linux generates the rest of these, other tcp
* stacks (i.e. bsd) tend to hide them behind
* getsockopt() interfaces. They occur when
* the net goes sour or the client disconnects
* after the three-way handshake has been done
* in the kernel but before userland has picked
* up the socket.
*/
#ifdef ECONNRESET
case ECONNRESET:
#endif
#ifdef ETIMEDOUT
case ETIMEDOUT:
#endif
#ifdef EHOSTUNREACH
case EHOSTUNREACH:
#endif
#ifdef ENETUNREACH
case ENETUNREACH:
#endif
break;
#ifdef ENETDOWN
case ENETDOWN:
/*
* When the network layer has been shut down, there
* is not much use in simply exiting: the parent
* would simply re-create us (and we'd fail again).
* Use the CHILDFATAL code to tear the server down.
* @@@ Martin's idea for possible improvement:
* A different approach would be to define
* a new APEXIT_NETDOWN exit code, the reception
* of which would make the parent shutdown all
* children, then idle-loop until it detected that
* the network is up again, and restart the children.
* Ben Hyde noted that temporary ENETDOWN situations
* occur in mobile IP.
*/
ap_log_error(APLOG_MARK, APLOG_EMERG, errno, server_conf,
"accept: giving up.");
clean_child_exit(APEXIT_CHILDFATAL);
#endif /*ENETDOWN*/
#ifdef TPF
case EINACT:
ap_log_error(APLOG_MARK, APLOG_EMERG, errno, server_conf,
"offload device inactive");
clean_child_exit(APEXIT_CHILDFATAL);
break;
default:
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, server_conf,
"select/accept error (%u)", errno);
clean_child_exit(APEXIT_CHILDFATAL);
#else
default:
ap_log_error(APLOG_MARK, APLOG_ERR, errno, server_conf,
"accept: (client socket)");
clean_child_exit(1);
#endif
}
}
if (ap_graceful_stop_signalled()) {
clean_child_exit(0);
}
usr1_just_die = 1;
}
SAFE_ACCEPT(accept_mutex_off()); /* unlock after "accept" */
#ifdef TPF
if (csd == 0) /* 0 is invalid socket for TPF */
continue;
#endif
/* We've got a socket, let's at least process one request off the
* socket before we accept a graceful restart request. We set
* the signal to ignore because we don't want to disturb any
* third party code.
*/
ap_signal(SIGUSR1, SIG_IGN);
/*
* We now have a connection, so set it up with the appropriate
* socket options, file descriptors, and read/write buffers.
*/
ap_get_os_sock(&sockdes, csd);
clen = sizeof(sa_server);
if (getsockname(sockdes, &sa_server, &clen) < 0) {
ap_log_error(APLOG_MARK, APLOG_ERR, errno, server_conf, "getsockname");
ap_close_socket(csd);
continue;
}
sock_disable_nagle(sockdes);
iol = unix_attach_socket(csd);
if (iol == NULL) {
if (errno == EBADF) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, NULL,
"filedescriptor (%u) larger than FD_SETSIZE (%u) "
"found, you probably need to rebuild Apache with a "
"larger FD_SETSIZE", sockdes, FD_SETSIZE);
}
else {
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, NULL,
"error attaching to socket");
}
ap_close_socket(csd);
continue;
}
(void) ap_update_child_status(my_child_num, SERVER_BUSY_READ,
(request_rec *) NULL);
conn_io = ap_bcreate(ptrans, B_RDWR);
ap_bpush_iol(conn_io, iol);
current_conn = ap_new_apr_connection(ptrans, server_conf, conn_io, csd,
my_child_num);
ap_process_connection(current_conn);
}
}
static int make_child(server_rec *s, int slot, time_t now)
{
int pid;
if (slot + 1 > max_daemons_limit) {
max_daemons_limit = slot + 1;
}
if (one_process) {
ap_signal(SIGHUP, just_die);
ap_signal(SIGINT, just_die);
#ifdef SIGQUIT
ap_signal(SIGQUIT, SIG_DFL);
#endif
ap_signal(SIGTERM, just_die);
child_main(slot);
}
(void) ap_update_child_status(slot, SERVER_STARTING, (request_rec *) NULL);
#ifdef _OSD_POSIX
/* BS2000 requires a "special" version of fork() before a setuid() call */
if ((pid = os_fork(unixd_config.user_name)) == -1) {
#elif defined(TPF)
if ((pid = os_fork(s, slot)) == -1) {
#else
if ((pid = fork()) == -1) {
#endif
ap_log_error(APLOG_MARK, APLOG_ERR, errno, s, "fork: Unable to fork new process");
/* fork didn't succeed. Fix the scoreboard or else
* it will say SERVER_STARTING forever and ever
*/
(void) ap_update_child_status(slot, SERVER_DEAD, (request_rec *) NULL);
/* In case system resources are maxxed out, we don't want
Apache running away with the CPU trying to fork over and
over and over again. */
sleep(10);
return -1;
}
if (!pid) {
#ifdef AIX_BIND_PROCESSOR
/* by default AIX binds to a single processor
* this bit unbinds children which will then bind to another cpu
*/
#include <sys/processor.h>
int status = bindprocessor(BINDPROCESS, (int)getpid(),
PROCESSOR_CLASS_ANY);
if (status != OK) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, server_conf,
"processor unbind failed %d", status);
}
#endif
RAISE_SIGSTOP(MAKE_CHILD);
/* Disable the restart signal handlers and enable the just_die stuff.
* Note that since restart() just notes that a restart has been
* requested there's no race condition here.
*/
ap_signal(SIGHUP, just_die);
ap_signal(SIGUSR1, just_die);
ap_signal(SIGTERM, just_die);
child_main(slot);
}
ap_scoreboard_image->parent[slot].pid = pid;
#ifdef SCOREBOARD_FILE
lseek(scoreboard_fd, XtOffsetOf(scoreboard, parent[slot]), 0);
force_write(scoreboard_fd, &ap_scoreboard_image->parent[slot],
sizeof(parent_score));
#endif
return 0;
}
/* start up a bunch of children */
static void startup_children(int number_to_start)
{
int i;
time_t now = time(0);
for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
if (ap_scoreboard_image->servers[i].status != SERVER_DEAD) {
continue;
}
if (make_child(server_conf, i, now) < 0) {
break;
}
--number_to_start;
}
}
/*
* idle_spawn_rate is the number of children that will be spawned on the
* next maintenance cycle if there aren't enough idle servers. It is
* doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
* without the need to spawn.
*/
static int idle_spawn_rate = 1;
#ifndef MAX_SPAWN_RATE
#define MAX_SPAWN_RATE (32)
#endif
static int hold_off_on_exponential_spawning;
static void perform_idle_server_maintenance(void)
{
int i;
int to_kill;
int idle_count;
short_score *ss;
time_t now = time(0);
int free_length;
int free_slots[MAX_SPAWN_RATE];
int last_non_dead;
int total_non_dead;
/* initialize the free_list */
free_length = 0;
to_kill = -1;
idle_count = 0;
last_non_dead = -1;
total_non_dead = 0;
ap_sync_scoreboard_image();
for (i = 0; i < ap_daemons_limit; ++i) {
int status;
if (i >= max_daemons_limit && free_length == idle_spawn_rate)
break;
ss = &ap_scoreboard_image->servers[i];
status = ss->status;
if (status == SERVER_DEAD) {
/* try to keep children numbers as low as possible */
if (free_length < idle_spawn_rate) {
free_slots[free_length] = i;
++free_length;
}
}
else {
/* We consider a starting server as idle because we started it
* at least a cycle ago, and if it still hasn't finished starting
* then we're just going to swamp things worse by forking more.
* So we hopefully won't need to fork more if we count it.
* This depends on the ordering of SERVER_READY and SERVER_STARTING.
*/
if (status <= SERVER_READY) {
++ idle_count;
/* always kill the highest numbered child if we have to...
* no really well thought out reason ... other than observing
* the server behaviour under linux where lower numbered children
* tend to service more hits (and hence are more likely to have
* their data in cpu caches).
*/
to_kill = i;
}
++total_non_dead;
last_non_dead = i;
}
}
max_daemons_limit = last_non_dead + 1;
if (idle_count > ap_daemons_max_free) {
/* kill off one child... we use SIGUSR1 because that'll cause it to
* shut down gracefully, in case it happened to pick up a request
* while we were counting
*/
kill(ap_scoreboard_image->parent[to_kill].pid, SIGUSR1);
idle_spawn_rate = 1;
}
else if (idle_count < ap_daemons_min_free) {
/* terminate the free list */
if (free_length == 0) {
/* only report this condition once */
static int reported = 0;
if (!reported) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, server_conf,
"server reached MaxClients setting, consider"
" raising the MaxClients setting");
reported = 1;
}
idle_spawn_rate = 1;
}
else {
if (idle_spawn_rate >= 8) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, server_conf,
"server seems busy, (you may need "
"to increase StartServers, or Min/MaxSpareServers), "
"spawning %d children, there are %d idle, and "
"%d total children", idle_spawn_rate,
idle_count, total_non_dead);
}
for (i = 0; i < free_length; ++i) {
#ifdef TPF
if(make_child(server_conf, free_slots[i], now) == -1) {
if(free_length == 1) {
shutdown_pending = 1;
ap_log_error(APLOG_MARK, APLOG_EMERG, server_conf,
"No active child processes: shutting down");
}
}
#else
make_child(server_conf, free_slots[i], now);
#endif /* TPF */
}
/* the next time around we want to spawn twice as many if this
* wasn't good enough, but not if we've just done a graceful
*/
if (hold_off_on_exponential_spawning) {
--hold_off_on_exponential_spawning;
}
else if (idle_spawn_rate < MAX_SPAWN_RATE) {
idle_spawn_rate *= 2;
}
}
}
else {
idle_spawn_rate = 1;
}
}
static void process_child_status(int pid, ap_wait_t status)
{
/* Child died... if it died due to a fatal error,
* we should simply bail out.
*/
if ((WIFEXITED(status)) &&
WEXITSTATUS(status) == APEXIT_CHILDFATAL) {
ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_NOERRNO, 0, server_conf,
"Child %d returned a Fatal error... \n"
"Apache is exiting!",
pid);
exit(APEXIT_CHILDFATAL);
}
if (WIFSIGNALED(status)) {
switch (WTERMSIG(status)) {
case SIGTERM:
case SIGHUP:
case SIGUSR1:
case SIGKILL:
break;
default:
#ifdef SYS_SIGLIST
#ifdef WCOREDUMP
if (WCOREDUMP(status)) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
0, server_conf,
"child pid %d exit signal %s (%d), "
"possible coredump in %s",
pid, (WTERMSIG(status) >= NumSIG) ? "" :
SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status),
ap_coredump_dir);
}
else {
#endif
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
0, server_conf,
"child pid %d exit signal %s (%d)", pid,
SYS_SIGLIST[WTERMSIG(status)], WTERMSIG(status));
#ifdef WCOREDUMP
}
#endif
#else
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE,
server_conf,
"child pid %d exit signal %d",
pid, WTERMSIG(status));
#endif
}
}
}
static int setup_listeners(server_rec *s)
{
ap_listen_rec *lr;
int sockdes;
if (ap_listen_open(s->process, s->port)) {
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, 0, s,
"no listening sockets available, shutting down");
return -1;
}
listenmaxfd = -1;
FD_ZERO(&listenfds);
for (lr = ap_listeners; lr; lr = lr->next) {
ap_get_os_sock(&sockdes, lr->sd);
FD_SET(sockdes, &listenfds);
if (sockdes > listenmaxfd) {
listenmaxfd = sockdes;
}
}
return 0;
}
/* Useful to erase the status of children that might be from previous
* generations */
static void ap_prefork_force_reset_connection_status(long conn_id)
{
int i;
for (i = 0; i < STATUSES_PER_CONNECTION; i++) {
ap_new_scoreboard_image->table[conn_id][i].key[0] = '\0';
} }
void ap_reset_connection_status(long conn_id)
{
if (maintain_connection_status) {
ap_prefork_force_reset_connection_status(conn_id);
}
}
/*****************************************************************
* Executive routines.
*/
int ap_mpm_run(ap_pool_t *_pconf, ap_pool_t *plog, server_rec *s)
{
int remaining_children_to_start;
pconf = _pconf;
server_conf = s;
ap_log_pid(pconf, ap_pid_fname);
if (setup_listeners(s)) {
/* XXX: hey, what's the right way for the mpm to indicate a fatal error? */
return 1;
}
SAFE_ACCEPT(accept_mutex_init(pconf));
if (!is_graceful) {
reinit_scoreboard(pconf);
}
#ifdef SCOREBOARD_FILE
else {
ap_scoreboard_fname = ap_server_root_relative(pconf, ap_scoreboard_fname);
ap_note_cleanups_for_fd(pconf, scoreboard_fd);
}
#endif
set_signals();
if (ap_daemons_max_free < ap_daemons_min_free + 1) /* Don't thrash... */
ap_daemons_max_free = ap_daemons_min_free + 1;
/* If we're doing a graceful_restart then we're going to see a lot
* of children exiting immediately when we get into the main loop
* below (because we just sent them SIGUSR1). This happens pretty
* rapidly... and for each one that exits we'll start a new one until
* we reach at least daemons_min_free. But we may be permitted to
* start more than that, so we'll just keep track of how many we're
* supposed to start up without the 1 second penalty between each fork.
*/
remaining_children_to_start = ap_daemons_to_start;
if (remaining_children_to_start > ap_daemons_limit) {
remaining_children_to_start = ap_daemons_limit;
}
if (!is_graceful) {
startup_children(remaining_children_to_start);
remaining_children_to_start = 0;
}
else {
/* give the system some time to recover before kicking into
* exponential mode */
hold_off_on_exponential_spawning = 10;
}
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, server_conf,
"%s configured -- resuming normal operations",
ap_get_server_version());
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, server_conf,
"Server built: %s", ap_get_server_built());
restart_pending = shutdown_pending = 0;
while (!restart_pending && !shutdown_pending) {
int child_slot;
ap_wait_t status;
int pid = wait_or_timeout(&status);
/* XXX: if it takes longer than 1 second for all our children
* to start up and get into IDLE state then we may spawn an
* extra child
*/
if (pid >= 0) {
process_child_status(pid, status);
/* non-fatal death... note that it's gone in the scoreboard. */
ap_sync_scoreboard_image();
child_slot = find_child_by_pid(pid);
if (child_slot >= 0) {
ap_prefork_force_reset_connection_status(child_slot);
(void) ap_update_child_status(child_slot, SERVER_DEAD,
(request_rec *) NULL);
if (remaining_children_to_start
&& child_slot < ap_daemons_limit) {
/* we're still doing a 1-for-1 replacement of dead
* children with new children
*/
make_child(server_conf, child_slot, time(0));
--remaining_children_to_start;
}
#ifdef HAS_OTHER_CHILD
}
else if (reap_other_child(pid, status) == 0) {
/* handled */
#endif
}
else if (is_graceful) {
/* Great, we've probably just lost a slot in the
* scoreboard. Somehow we don't know about this
* child.
*/
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING,
0, server_conf,
"long lost child came home! (pid %d)", pid);
}
/* Don't perform idle maintenance when a child dies,
* only do it when there's a timeout. Remember only a
* finite number of children can die, and it's pretty
* pathological for a lot to die suddenly.
*/
continue;
}
else if (remaining_children_to_start) {
/* we hit a 1 second timeout in which none of the previous
* generation of children needed to be reaped... so assume
* they're all done, and pick up the slack if any is left.
*/
startup_children(remaining_children_to_start);
remaining_children_to_start = 0;
/* In any event we really shouldn't do the code below because
* few of the servers we just started are in the IDLE state
* yet, so we'd mistakenly create an extra server.
*/
continue;
}
perform_idle_server_maintenance();
#ifdef TPF
shutdown_pending = os_check_server(tpf_server_name);
ap_check_signals();
sleep(1);
#endif /*TPF */
}
if (shutdown_pending) {
/* Time to gracefully shut down:
* Kill child processes, tell them to call child_exit, etc...
*/
if (unixd_killpg(getpgrp(), SIGTERM) < 0) {
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "killpg SIGTERM");
}
reclaim_child_processes(1); /* Start with SIGTERM */
/* cleanup pid file on normal shutdown */
{
const char *pidfile = NULL;
pidfile = ap_server_root_relative (pconf, ap_pid_fname);
if ( pidfile != NULL && unlink(pidfile) == 0)
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO,
0, server_conf,
"removed PID file %s (pid=%ld)",
pidfile, (long)getpid());
}
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, server_conf,
"caught SIGTERM, shutting down");
return 1;
}
/* we've been told to restart */
ap_signal(SIGHUP, SIG_IGN);
ap_signal(SIGUSR1, SIG_IGN);
if (one_process) {
/* not worth thinking about */
return 1;
}
/* advance to the next generation */
/* XXX: we really need to make sure this new generation number isn't in
* use by any of the children.
*/
++ap_my_generation;
ap_scoreboard_image->global.running_generation = ap_my_generation;
update_scoreboard_global();
if (is_graceful) {
#ifndef SCOREBOARD_FILE
int i;
#endif
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, server_conf,
"SIGUSR1 received. Doing graceful restart");
/* kill off the idle ones */
if (unixd_killpg(getpgrp(), SIGUSR1) < 0) {
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "killpg SIGUSR1");
}
#ifndef SCOREBOARD_FILE
/* This is mostly for debugging... so that we know what is still
* gracefully dealing with existing request. But we can't really
* do it if we're in a SCOREBOARD_FILE because it'll cause
* corruption too easily.
*/
ap_sync_scoreboard_image();
for (i = 0; i < ap_daemons_limit; ++i) {
if (ap_scoreboard_image->servers[i].status != SERVER_DEAD) {
ap_scoreboard_image->servers[i].status = SERVER_GRACEFUL;
}
}
#endif
}
else {
/* Kill 'em off */
if (unixd_killpg(getpgrp(), SIGHUP) < 0) {
ap_log_error(APLOG_MARK, APLOG_WARNING, errno, server_conf, "killpg SIGHUP");
}
reclaim_child_processes(0); /* Not when just starting up */
ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, server_conf,
"SIGHUP received. Attempting to restart");
}
if (!is_graceful) {
ap_restart_time = time(NULL);
}
return 0;
}
static void prefork_pre_config(ap_pool_t *p, ap_pool_t *plog, ap_pool_t *ptemp)
{
static int restart_num = 0;
one_process = !!getenv("ONE_PROCESS");
/* sigh, want this only the second time around */
if (restart_num++ == 1) {
is_graceful = 0;
if (!one_process) {
unixd_detach();
}
my_pid = getpid();
}
unixd_pre_config();
ap_listen_pre_config();
ap_daemons_to_start = DEFAULT_START_DAEMON;
ap_daemons_min_free = DEFAULT_MIN_FREE_DAEMON;
ap_daemons_max_free = DEFAULT_MAX_FREE_DAEMON;
ap_daemons_limit = HARD_SERVER_LIMIT;
ap_pid_fname = DEFAULT_PIDLOG;
ap_scoreboard_fname = DEFAULT_SCOREBOARD;
ap_lock_fname = DEFAULT_LOCKFILE;
ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
ap_extended_status = 0;
ap_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
}
static void prefork_hooks(void)
{
INIT_SIGLIST();
#ifdef AUX3
(void) set42sig();
#endif
/* TODO: set one_process properly */ one_process = 0;
}
static const char *set_pidfile(cmd_parms *cmd, void *dummy, char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
if (cmd->server->is_virtual) {
return "PidFile directive not allowed in <VirtualHost>";
}
ap_pid_fname = arg;
return NULL;
}
static const char *set_scoreboard(cmd_parms *cmd, void *dummy, char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_scoreboard_fname = arg;
return NULL;
}
static const char *set_lockfile(cmd_parms *cmd, void *dummy, char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_lock_fname = arg;
return NULL;
}
static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy, char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_daemons_to_start = atoi(arg);
return NULL;
}
static const char *set_min_free_servers(cmd_parms *cmd, void *dummy, char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_daemons_min_free = atoi(arg);
if (ap_daemons_min_free <= 0) {
ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
"WARNING: detected MinSpareServers set to non-positive.");
ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
"Resetting to 1 to avoid almost certain Apache failure.");
ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
"Please read the documentation.");
ap_daemons_min_free = 1;
}
return NULL;
}
static const char *set_max_free_servers(cmd_parms *cmd, void *dummy, char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_daemons_max_free = atoi(arg);
return NULL;
}
static const char *set_server_limit (cmd_parms *cmd, void *dummy, char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_daemons_limit = atoi(arg);
if (ap_daemons_limit > HARD_SERVER_LIMIT) {
ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
"WARNING: MaxClients of %d exceeds compile time limit "
"of %d servers,", ap_daemons_limit, HARD_SERVER_LIMIT);
ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
" lowering MaxClients to %d. To increase, please "
"see the", HARD_SERVER_LIMIT);
ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
" HARD_SERVER_LIMIT define in src/include/httpd.h.");
ap_daemons_limit = HARD_SERVER_LIMIT;
}
else if (ap_daemons_limit < 1) {
ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
"WARNING: Require MaxClients > 0, setting to 1");
ap_daemons_limit = 1;
}
return NULL;
}
static const char *set_max_requests(cmd_parms *cmd, void *dummy, char *arg)
{
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
ap_max_requests_per_child = atoi(arg);
return NULL;
}
static const char *set_coredumpdir (cmd_parms *cmd, void *dummy, char *arg)
{
struct stat finfo;
const char *fname;
const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
if (err != NULL) {
return err;
}
fname = ap_server_root_relative(cmd->pool, arg);
if ((stat(fname, &finfo) == -1) || !S_ISDIR(finfo.st_mode)) {
return ap_pstrcat(cmd->pool, "CoreDumpDirectory ", fname,
" does not exist or is not a directory", NULL);
}
ap_cpystrn(ap_coredump_dir, fname, sizeof(ap_coredump_dir));
return NULL;
}
/* Stub functions until this MPM supports the connection status API */
/* Don't mess with the string you get back from this function */
const char *ap_get_connection_status(long conn_id, const char *key)
{
int i = 0;
status_table_entry *ss;
if (!maintain_connection_status) return "";
while (i < STATUSES_PER_CONNECTION) {
ss = &(ap_new_scoreboard_image->table[conn_id][i]);
if (ss->key[0] == '\0') {
break;
}
if (0 == strcmp(ss->key, key)) {
return ss->value;
}
}
return NULL;
}
ap_array_header_t *ap_get_connections(ap_pool_t *p)
{
int i;
ap_array_header_t *connection_list;
long *array_slot;
connection_list = ap_make_array(p, 0, sizeof(long));
/* We assume that there is a connection iff it has an entry in the status
* table. Connections without any status sound problematic to me, so this
* is probably for the best. - manoj */
for (i = 0; i < max_daemons_limit; i++) {
if (ap_new_scoreboard_image->table[i][0].key[0] != '\0') {
array_slot = ap_push_array(connection_list);
*array_slot = i;
}
}
return connection_list;
}
ap_array_header_t *ap_get_connection_keys(ap_pool_t *p, long conn_id)
{
int i = 0;
status_table_entry *ss;
ap_array_header_t *key_list;
char **array_slot;
key_list = ap_make_array(p, 0, KEY_LENGTH * sizeof(char));
while (i < STATUSES_PER_CONNECTION) {
ss = &(ap_new_scoreboard_image->table[conn_id][i]);
if (ss->key[0] == '\0') {
break;
}
array_slot = ap_push_array(key_list);
*array_slot = ap_pstrdup(p, ss->key);
i++;
}
return key_list;
}
/* Note: no effort is made here to prevent multiple threads from messing with
* a single connection at the same time. ap_update_connection_status should
* only be called by the thread that owns the connection */
void ap_update_connection_status(long conn_id, const char *key,
const char *value)
{
int i = 0;
status_table_entry *ss;
if (!maintain_connection_status) return;
while (i < STATUSES_PER_CONNECTION) {
ss = &(ap_new_scoreboard_image->table[conn_id][i]);
if (ss->key[0] == '\0') {
break;
}
if (0 == strcmp(ss->key, key)) {
ap_cpystrn(ss->value, value, VALUE_LENGTH);
return;
}
i++;
}
/* Not found. Add an entry for this value */
if (i >= STATUSES_PER_CONNECTION) {
/* No room. Oh well, not much anyone can do about it. */
return;
}
ap_cpystrn(ss->key, key, KEY_LENGTH);
ap_cpystrn(ss->value, value, VALUE_LENGTH);
return;
}
ap_array_header_t *ap_get_status_table(ap_pool_t *p)
{
int i, j;
ap_array_header_t *server_status;
ap_status_table_row_t *array_slot;
status_table_entry *ss;
server_status = ap_make_array(p, 0, sizeof(ap_status_table_row_t));
/* Go ahead and return what's in the connection status table even if we
* aren't maintaining it. We can at least look at what children from
* previous generations are up to. */
for (i = 0; i < max_daemons_limit; i++) {
if (ap_new_scoreboard_image->table[i][0].key[0] == '\0')
continue;
array_slot = ap_push_array(server_status);
array_slot->data = ap_make_table(p, 0);
array_slot->conn_id = i;
for (j = 0; j < STATUSES_PER_CONNECTION; j++) {
ss = &(ap_new_scoreboard_image->table[i][j]);
if (ss->key[0] != '\0') {
ap_table_add(array_slot->data, ss->key, ss->value);
}
else {
break;
}
}
}
return server_status;
}
static const command_rec prefork_cmds[] = {
UNIX_DAEMON_COMMANDS
LISTEN_COMMANDS
{ "PidFile", set_pidfile, NULL, RSRC_CONF, TAKE1,
"A file for logging the server process ID"},
{ "ScoreBoardFile", set_scoreboard, NULL, RSRC_CONF, TAKE1,
"A file for Apache to maintain runtime process management information"},
{ "LockFile", set_lockfile, NULL, RSRC_CONF, TAKE1,
"The lockfile used when Apache needs to lock the accept() call"},
{ "StartServers", set_daemons_to_start, NULL, RSRC_CONF, TAKE1,
"Number of child processes launched at server startup" },
{ "MinSpareServers", set_min_free_servers, NULL, RSRC_CONF, TAKE1,
"Minimum number of idle children, to handle request spikes" },
{ "MaxSpareServers", set_max_free_servers, NULL, RSRC_CONF, TAKE1,
"Maximum number of idle children" },
{ "MaxClients", set_server_limit, NULL, RSRC_CONF, TAKE1,
"Maximum number of children alive at the same time" },
{ "MaxRequestsPerChild", set_max_requests, NULL, RSRC_CONF, TAKE1,
"Maximum number of requests a particular child serves before dying." },
{ "CoreDumpDirectory", set_coredumpdir, NULL, RSRC_CONF, TAKE1,
"The location of the directory Apache changes to before dumping core" },
{ NULL }
};
module MODULE_VAR_EXPORT mpm_prefork_module = {
MPM20_MODULE_STUFF,
prefork_pre_config, /* run hook before the configuration is read */
NULL, /* create per-directory config structure */
NULL, /* merge per-directory config structures */
NULL, /* create per-server config structure */
NULL, /* merge per-server config structures */
prefork_cmds, /* command ap_table_t */
NULL, /* handlers */
prefork_hooks, /* register hooks */
};