+++ /dev/null
-/* ====================================================================
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 2000-2001 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.
- */
-
-#define CORE_PRIVATE
-#define INCL_DOS
-#define INCL_DOSERRORS
-
-#include "ap_config.h"
-#include "httpd.h"
-#include "mpm_default.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 "mpm.h"
-#include "ap_mpm.h"
-#include "ap_listen.h"
-#include "apr_portable.h"
-#include "mpm_common.h"
-#include "apr_strings.h"
-
-#include <os2.h>
-#include <stdlib.h>
-#include <sys/signal.h>
-#include <process.h>
-#include <time.h>
-#include <io.h>
-
-/* SPMT_OS2 only ever has 1 process */
-#define HARD_SERVER_LIMIT 1
-
-/* Limit on the total --- clients will be locked out if more servers than
- * this are needed. It is intended solely to keep the server from crashing
- * when things get out of hand.
- *
- * We keep a hard maximum number of servers, for two reasons --- first off,
- * in case something goes seriously wrong, we want to stop the fork bomb
- * short of actually crashing the machine we're running on by filling some
- * kernel table. Secondly, it keeps the size of the scoreboard file small
- * enough that we can read the whole thing without worrying too much about
- * the overhead.
- */
-#ifndef HARD_THREAD_LIMIT
-#define HARD_THREAD_LIMIT 256
-#endif
-
-/* config globals */
-
-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;
-
-/*
- * 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;
-int ap_threads_per_child = HARD_THREAD_LIMIT;
-ap_generation_t volatile ap_my_generation=0; /* Used by the scoreboard */
-
-char ap_coredump_dir[MAX_STRING_LEN];
-
-/* *Non*-shared http_main globals... */
-
-server_rec *ap_server_conf;
-
-/* 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 apr_pool_t *pconf; /* Pool for config stuff */
-
-struct thread_globals {
- int thread_num;
- apr_pool_t *pchild; /* Pool for httpd child stuff */
- int usr1_just_die;
-};
-
-static struct thread_globals **ppthread_globals = NULL;
-
-#define THREAD_GLOBAL(gvar) ((*ppthread_globals)->gvar)
-
-struct thread_control_t {
- apr_wait_t thread_retval;
- char deferred_die;
- ap_generation_t generation; /* generation of this thread */
-} thread_control[HARD_THREAD_LIMIT];
-
-/* a clean exit from a child with proper cleanup */
-static void clean_child_exit(int code)
-{
- if (THREAD_GLOBAL(pchild)) {
- apr_pool_destroy(THREAD_GLOBAL(pchild));
- }
-
- thread_control[THREAD_GLOBAL(thread_num)].deferred_die = 0;
- thread_control[THREAD_GLOBAL(thread_num)].thread_retval = code;
- _endthread();
-}
-
-static apr_lock_t *accept_mutex = NULL;
-
-static apr_status_t accept_mutex_child_cleanup(void *foo)
-{
- return apr_lock_release(accept_mutex);
-}
-
-/*
- * Initialize mutex lock.
- * Done by each child at its birth
- */
-static void accept_mutex_child_init(apr_pool_t *p)
-{
- apr_pool_cleanup_register(p, NULL, accept_mutex_child_cleanup, apr_pool_cleanup_null);
-}
-
-/*
- * Initialize mutex lock.
- * Must be safe to call this on a restart.
- */
-static void accept_mutex_init(apr_pool_t *p)
-{
- apr_status_t rc = apr_lock_create(&accept_mutex, APR_MUTEX, APR_INTRAPROCESS,
- APR_LOCK_DEFAULT, NULL, p);
-
- if (rc != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_EMERG, rc, ap_server_conf,
- "Error creating accept lock. Exiting!");
- clean_child_exit(APEXIT_CHILDFATAL);
- }
-}
-
-static void accept_mutex_on(void)
-{
- apr_status_t rc = apr_lock_acquire(accept_mutex);
-
- if (rc != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_EMERG, rc, ap_server_conf,
- "Error getting accept lock. Exiting!");
- clean_child_exit(APEXIT_CHILDFATAL);
- }
-}
-
-static void accept_mutex_off(void)
-{
- apr_status_t rc = apr_lock_release(accept_mutex);
-
- if (rc != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_EMERG, rc, ap_server_conf,
- "Error freeing accept lock. Exiting!");
- clean_child_exit(APEXIT_CHILDFATAL);
- }
-}
-
-
-
-/* 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
-
-static int find_thread_by_tid(int tid)
-{
- int i;
-
- for (i = 0; i < max_daemons_limit; ++i)
- if (ap_scoreboard_image->servers[0][i].tid == tid)
- return i;
-
- return -1;
-}
-
-/* Finally, this routine is used by the caretaker thread 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(apr_wait_t *status)
-{
- int ret;
- ULONG tid;
-
- ++wait_or_timeout_counter;
- if (wait_or_timeout_counter == INTERVAL_OF_WRITABLE_PROBES) {
- wait_or_timeout_counter = 0;
- }
-
- tid = 0;
- ret = DosWaitThread(&tid, DCWW_NOWAIT);
-
- if (ret == 0) {
- int thread_num = find_thread_by_tid(tid);
- ap_assert( thread_num > 0 );
- *status = thread_control[thread_num].thread_retval;
- return tid;
- }
-
- DosSleep(SCOREBOARD_MAINTENANCE_INTERVAL / 1000);
- return -1;
-}
-
-
-
-/* handle all varieties of core dumping signals */
-static void sig_coredump(int sig)
-{
- chdir(ap_coredump_dir);
- 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 void usr1_handler(int sig)
-{
- if (THREAD_GLOBAL(usr1_just_die)) {
- just_die(sig);
- }
- thread_control[THREAD_GLOBAL(thread_num)].deferred_die = 1;
-}
-
-/* volatile just in case */
-static int volatile shutdown_pending;
-static int volatile restart_pending;
-static int volatile is_graceful;
-static int volatile child_fatal;
-
-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;
- is_graceful = sig == SIGUSR1;
-}
-
-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, ap_server_conf, "sigaction(SIGSEGV)");
-#ifdef SIGBUS
- if (sigaction(SIGBUS, &sa, NULL) < 0)
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGBUS)");
-#endif
-#ifdef SIGABORT
- if (sigaction(SIGABORT, &sa, NULL) < 0)
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABORT)");
-#endif
-#ifdef SIGABRT
- if (sigaction(SIGABRT, &sa, NULL) < 0)
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGABRT)");
-#endif
-#ifdef SIGILL
- if (sigaction(SIGILL, &sa, NULL) < 0)
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_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, ap_server_conf, "sigaction(SIGTERM)");
-#ifdef SIGINT
- if (sigaction(SIGINT, &sa, NULL) < 0)
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_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, ap_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, ap_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, ap_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, ap_server_conf, "sigaction(SIGHUP)");
- if (sigaction(SIGUSR1, &sa, NULL) < 0)
- ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(SIGUSR1)");
-#else
- if (!one_process) {
- signal(SIGSEGV, sig_coredump);
-#ifdef SIGBUS
- signal(SIGBUS, sig_coredump);
-#endif /* SIGBUS */
-#ifdef SIGABORT
- signal(SIGABORT, sig_coredump);
-#endif /* SIGABORT */
-#ifdef SIGABRT
- signal(SIGABRT, sig_coredump);
-#endif /* SIGABRT */
-#ifdef SIGILL
- signal(SIGILL, sig_coredump);
-#endif /* SIGILL */
-#ifdef SIGXCPU
- signal(SIGXCPU, SIG_DFL);
-#endif /* SIGXCPU */
-#ifdef SIGXFSZ
- signal(SIGXFSZ, SIG_DFL);
-#endif /* SIGXFSZ */
- }
-
- signal(SIGTERM, sig_term);
-#ifdef SIGHUP
- signal(SIGHUP, restart);
-#endif /* SIGHUP */
-#ifdef SIGUSR1
- signal(SIGUSR1, restart);
-#endif /* SIGUSR1 */
-#ifdef SIGPIPE
- signal(SIGPIPE, SIG_IGN);
-#endif /* SIGPIPE */
-
-#endif
-}
-
-/*****************************************************************
- * Child process main loop.
- */
-
-AP_DECLARE(void) ap_child_terminate(request_rec *r)
-{
- r->connection->keepalive = 0;
- thread_control[THREAD_GLOBAL(thread_num)].deferred_die = 1;
-}
-
-
-
-int ap_graceful_stop_signalled(void)
-{
- if (thread_control[THREAD_GLOBAL(thread_num)].deferred_die ||
- ap_scoreboard_image->global->running_generation != thread_control[THREAD_GLOBAL(thread_num)].generation) {
- return 1;
- }
- return 0;
-}
-
-
-
-int ap_stop_signalled(void)
-{
- if (shutdown_pending || restart_pending ||
- thread_control[THREAD_GLOBAL(thread_num)].deferred_die ||
- ap_scoreboard_image->global->running_generation != thread_control[THREAD_GLOBAL(thread_num)].generation) {
- return 1;
- }
- return 0;
-}
-
-
-
-static int setup_listen_poll(apr_pool_t *pchild, apr_pollfd_t **listen_poll)
-{
- ap_listen_rec *lr;
- int numfds = 0;
-
- for (lr = ap_listeners; lr; lr = lr->next) {
- numfds++;
- }
-
- apr_poll_setup(listen_poll, numfds, pchild);
-
- for (lr = ap_listeners; lr; lr = lr->next) {
- apr_poll_socket_add(*listen_poll, lr->sd, APR_POLLIN);
- }
- return 0;
-}
-
-
-
-static void thread_main(void *thread_num_arg)
-{
- ap_listen_rec *lr = NULL;
- ap_listen_rec *first_lr = NULL;
- apr_pool_t *ptrans;
- conn_rec *current_conn;
- apr_pool_t *pchild;
- int requests_this_child = 0;
- apr_pollfd_t *listen_poll;
- apr_socket_t *csd = NULL;
- int nsds, rv;
- ap_sb_handle_t *sbh;
-
- /* 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.
- */
-
- set_signals(); /* signals aren't inherrited by child threads */
- signal(SIGHUP, just_die);
- signal(SIGUSR1, just_die);
- signal(SIGTERM, just_die);
-
- /* Get a sub pool for global allocations in this child, so that
- * we can have cleanups occur when the child exits.
- */
- apr_pool_create(&pchild, pconf);
- *ppthread_globals = (struct thread_globals *)apr_palloc(pchild, sizeof(struct thread_globals));
- THREAD_GLOBAL(thread_num) = (int)thread_num_arg;
- THREAD_GLOBAL(pchild) = pchild;
- thread_control[THREAD_GLOBAL(thread_num)].generation = ap_scoreboard_image->global->running_generation;
- apr_pool_create(&ptrans, pchild);
-
- if (setup_listen_poll(pchild, &listen_poll)) {
- clean_child_exit(1);
- }
-
- /* needs to be done before we switch UIDs so we have permissions */
- SAFE_ACCEPT(accept_mutex_child_init(pchild));
-
- ap_run_child_init(pchild, ap_server_conf);
-
- (void) ap_update_child_status_from_indexes(0, THREAD_GLOBAL(thread_num),
- SERVER_READY,
- (request_rec *) NULL);
-
-
- signal(SIGHUP, just_die);
- signal(SIGTERM, just_die);
-
- while (!ap_stop_signalled()) {
- int srv;
- apr_socket_t *sd;
-
- /* Prepare to receive a SIGUSR1 due to graceful restart so that
- * we can exit cleanly.
- */
- THREAD_GLOBAL(usr1_just_die) = 1;
- signal(SIGUSR1, usr1_handler);
-
- /*
- * (Re)initialize this child to a pre-connection state.
- */
-
- current_conn = NULL;
-
- apr_pool_clear(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_from_indexes(0, THREAD_GLOBAL(thread_num),
- SERVER_READY,
- (request_rec *) NULL);
-
- /*
- * Wait for an acceptable connection to arrive.
- */
-
- /* Lock around "accept", if necessary */
- SAFE_ACCEPT(accept_mutex_on());
-
- if (ap_stop_signalled()) {
- clean_child_exit(0);
- }
-
- for (;;) {
- if (ap_listeners->next) {
- /* more than one socket */
- srv = apr_poll(listen_poll, &nsds, -1);
-
- if (srv != APR_SUCCESS) {
- /* 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, ap_server_conf, "select: (listen)");
- clean_child_exit(1);
- }
-
- /* we remember the last_lr we searched last time around so that
- we don't end up starving any particular listening socket */
- if (first_lr == NULL) {
- first_lr = ap_listeners;
- }
-
- lr = first_lr;
-
- do {
- apr_int16_t event;
-
- if (!lr) {
- lr = ap_listeners;
- }
-
- apr_poll_revents_get(&event, lr->sd, listen_poll);
-
- if (event == APR_POLLIN) {
- first_lr = lr->next;
- break;
- }
- lr = lr->next;
- } while (lr != first_lr);
-
- if (lr == first_lr) {
- continue;
- }
- 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
- */
- THREAD_GLOBAL(usr1_just_die) = 0;
- rv = apr_accept(&csd, sd, ptrans);
-
- if (APR_STATUS_IS_SUCCESS(rv)) {
- break; /* We have a socket ready for reading */
- }
- else if (APR_STATUS_IS_ECONNABORTED(rv)
- || APR_STATUS_IS_ECONNRESET(rv)
- || APR_STATUS_IS_ETIMEDOUT(rv)
- || APR_STATUS_IS_EHOSTUNREACH(rv)
- || APR_STATUS_IS_ENETUNREACH(rv)) {
-
- /* 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.
- */
-
- /* Linux generates most 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.
- */
- break;
- }
- else if (APR_STATUS_IS_EINTR(rv)) {
- /* We only get hit by an EINTR if the parent is
- * killing us off
- */
- clean_child_exit(0);
- }
- else {
- ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf,
- "accept: (client socket)");
- clean_child_exit(1);
- }
-
- if (ap_stop_signalled()) {
- clean_child_exit(0);
- }
- THREAD_GLOBAL(usr1_just_die) = 1;
- }
-
- SAFE_ACCEPT(accept_mutex_off()); /* unlock after "accept" */
-
- /* 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.
- */
- signal(SIGUSR1, SIG_IGN);
-
- ap_create_sb_handle(&sbh, ptrans, 0, THREAD_GLOBAL(thread_num));
- /*
- * We now have a connection, so set it up with the appropriate
- * socket options, file descriptors, and read/write buffers.
- */
- current_conn = ap_run_create_connection(ptrans, ap_server_conf, csd,
- THREAD_GLOBAL(thread_num));
-
- if (current_conn) {
- ap_process_connection(current_conn);
- ap_lingering_close(current_conn);
- }
- }
-
- clean_child_exit(0);
-}
-
-
-static int make_child(server_rec *s, int slot)
-{
- TID tid;
-
- if (slot + 1 > max_daemons_limit) {
- max_daemons_limit = slot + 1;
- }
-
- if (one_process) {
- struct thread_globals *parent_globals = *ppthread_globals;
- signal(SIGHUP, just_die);
- signal(SIGINT, just_die);
-#ifdef SIGQUIT
- signal(SIGQUIT, SIG_DFL);
-#endif
- signal(SIGTERM, just_die);
- thread_main((void *)slot);
- *ppthread_globals = parent_globals;
- }
-
- ap_update_child_status_from_indexes(0, slot, SERVER_STARTING,
- (request_rec *) NULL);
-
- if ((tid = _beginthread(thread_main, NULL, 256*1024, (void *)slot)) == -1) {
- ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_NOERRNO, 0, s, "_beginthread: Unable to create new thread");
-
- /* _beginthread didn't succeed. Fix the scoreboard or else
- * it will say SERVER_STARTING forever and ever
- */
- (void) ap_update_child_status_from_indexes(0, 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 _beginthread over and
- over and over again. */
- sleep(10);
-
- return -1;
- }
-
- ap_scoreboard_image->servers[0][slot].tid = tid;
- return 0;
-}
-
-
-/* start up a bunch of children */
-static void startup_children(int number_to_start)
-{
- int i;
-
- for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
- if (ap_scoreboard_image->servers[0][i].status != SERVER_DEAD) {
- continue;
- }
- if (make_child(ap_server_conf, i) < 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;
- worker_score *ws;
- 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;
-
- for (i = 0; i < ap_daemons_limit; ++i) {
- int status;
-
- if (i >= max_daemons_limit && free_length == idle_spawn_rate)
- break;
- ws = &ap_scoreboard_image->servers[0][i];
- status = ws->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
- */
- thread_control[to_kill].deferred_die = 1;
- 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, ap_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, ap_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) {
- make_child(ap_server_conf, free_slots[i]);
- }
- /* 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;
- }
-}
-
-AP_DECLARE(apr_status_t) ap_mpm_query(int query_code, int *result)
-{
- switch(query_code){
- case AP_MPMQ_MAX_DAEMON_USED:
- *result = max_daemons_limit;
- return APR_SUCCESS;
- case AP_MPMQ_IS_THREADED:
- *result = AP_MPMQ_DYNAMIC;
- return APR_SUCCESS;
- case AP_MPMQ_IS_FORKED:
- *result = AP_MPMQ_NOT_SUPPORTED;
- return APR_SUCCESS;
- case AP_MPMQ_HARD_LIMIT_DAEMONS:
- *result = HARD_SERVER_LIMIT;
- return APR_SUCCESS;
- case AP_MPMQ_HARD_LIMIT_THREADS:
- *result = HARD_THREAD_LIMIT;
- return APR_SUCCESS;
- case AP_MPMQ_MAX_THREADS:
- *result = ap_threads_per_child;
- return APR_SUCCESS;
- case AP_MPMQ_MIN_SPARE_DAEMONS:
- *result = 0;
- return APR_SUCCESS;
- case AP_MPMQ_MIN_SPARE_THREADS:
- *result = ap_daemons_min_free;
- return APR_SUCCESS;
- case AP_MPMQ_MAX_SPARE_DAEMONS:
- *result = 0;
- return APR_SUCCESS;
- case AP_MPMQ_MAX_SPARE_THREADS:
- *result = ap_daemons_max_free;
- return APR_SUCCESS;
- case AP_MPMQ_MAX_REQUESTS_DAEMON:
- *result = ap_max_requests_per_child;
- return APR_SUCCESS;
- case AP_MPMQ_MAX_DAEMONS:
- *result = ap_daemons_limit;
- return APR_SUCCESS;
- }
- return APR_ENOTIMPL;
-}
-
-/*****************************************************************
- * Executive routines.
- */
-
-int ap_mpm_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s)
-{
- int remaining_children_to_start;
- int i;
- apr_status_t status;
-
- pconf = _pconf;
- ap_server_conf = s;
-
- if ((status = ap_listen_open(s->process, s->port)) != APR_SUCCESS) {
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_ALERT, status, s,
- "no listening sockets available, shutting down");
- return -1;
- }
-
- ap_log_pid(pconf, ap_pid_fname);
-
- SAFE_ACCEPT(accept_mutex_init(pconf));
-
- if (!is_graceful) {
- ap_run_pre_mpm(pconf, SB_NOT_SHARED);
- memset(thread_control, 0, sizeof(thread_control));
- }
-
- set_signals();
- DosSetMaxFH(ap_daemons_limit * 2);
-
- if (ppthread_globals == NULL) {
- if (DosAllocThreadLocalMemory(1, (PULONG *)&ppthread_globals)) {
- ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_NOERRNO, 0, ap_server_conf,
- "Error allocating thread local storage"
- "Apache is exiting!");
- } else {
- *ppthread_globals = (struct thread_globals *)apr_palloc(pconf, sizeof(struct thread_globals));
- }
- }
-
- 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, ap_server_conf,
- "%s configured -- resuming normal operations",
- ap_get_server_version());
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_INFO, 0, ap_server_conf,
- "Server built: %s", ap_get_server_built());
- restart_pending = shutdown_pending = 0;
-
- printf("%s \n", ap_get_server_version());
-
- while (!restart_pending && !shutdown_pending) {
- int thread_slot;
- apr_wait_t status;
- int tid = 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 (tid >= 0) {
- apr_proc_t dummyproc;
- dummyproc.pid = tid;
- if (ap_process_child_status(&dummyproc, status) == APEXIT_CHILDFATAL) {
- shutdown_pending = 1;
- child_fatal = 1;
- break;
- }
- /* non-fatal death... note that it's gone in the scoreboard. */
- thread_slot = find_thread_by_tid(tid);
- if (thread_slot >= 0) {
- (void) ap_update_child_status_from_indexes(0, thread_slot,
- SERVER_DEAD,
- (request_rec *) NULL);
- if (remaining_children_to_start
- && thread_slot < ap_daemons_limit) {
- /* we're still doing a 1-for-1 replacement of dead
- * children with new children
- */
- make_child(ap_server_conf, thread_slot);
- --remaining_children_to_start;
- }
-#if APR_HAS_OTHER_CHILD
-/* TODO: this won't work, we waited on a thread not a process
- }
- else if (reap_other_child(pid, status) == 0) {
-*/
-#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, ap_server_conf,
- "long lost child came home! (tid %d)", tid);
- }
- /* 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();
- }
-
- if (shutdown_pending) {
- /* Time to gracefully shut down */
- const char *pidfile = NULL;
- int slot;
- TID tid;
- ULONG rc;
- ap_listen_rec *lr;
-
- for (lr = ap_listeners; lr; lr = lr->next) {
- apr_socket_close(lr->sd);
- DosSleep(0);
- }
-
- /* Kill off running threads */
- for (slot=0; slot<max_daemons_limit; slot++) {
- if (ap_scoreboard_image->servers[0][slot].status != SERVER_DEAD) {
- tid = ap_scoreboard_image->servers[0][slot].tid;
- rc = DosKillThread(tid);
-
- if (rc != ERROR_INVALID_THREADID) { // Already dead, ignore
- if (rc == 0) {
- rc = DosWaitThread(&tid, DCWW_WAIT);
-
- if (rc) {
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, ap_server_conf,
- "error %lu waiting for thread to terminate", rc);
- }
- } else {
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_WARNING, 0, ap_server_conf,
- "error %lu killing thread", rc);
- }
- }
- }
- }
-
- if (!child_fatal) {
- /* cleanup pid file on normal shutdown */
- 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,
- ap_server_conf,
- "removed PID file %s (pid=%ld)",
- pidfile, (long)getpid());
-
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
- "caught SIGTERM, shutting down");
- }
- return 1;
- }
-
- /* we've been told to restart */
- signal(SIGHUP, SIG_IGN);
- 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_scoreboard_image->global->running_generation;
-
- if (is_graceful) {
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
- "SIGUSR1 received. Doing graceful restart");
-
- /* kill off the idle ones */
- for (i = 0; i < ap_daemons_limit; ++i) {
- thread_control[i].deferred_die = 1;
- }
-
- /* 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.
- */
- for (i = 0; i < ap_daemons_limit; ++i) {
- if (ap_scoreboard_image->servers[0][i].status != SERVER_DEAD) {
- ap_scoreboard_image->servers[0][i].status = SERVER_GRACEFUL;
- }
- }
- }
- else {
- /* Kill 'em off */
- for (i = 0; i < ap_daemons_limit; ++i) {
- DosKillThread(ap_scoreboard_image->servers[0][i].tid);
- }
- ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_NOTICE, 0, ap_server_conf,
- "SIGHUP received. Attempting to restart");
- }
-
- return 0;
-}
-
-static void spmt_os2_pre_config(apr_pool_t *pconf, apr_pool_t *plog, apr_pool_t *ptemp)
-{
- one_process = ap_exists_config_define("ONE_PROCESS") ||
- ap_exists_config_define("DEBUG");
-
- is_graceful = 0;
- 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_THREAD_LIMIT;
- ap_pid_fname = DEFAULT_PIDLOG;
- ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
- ap_extended_status = 0;
- ap_scoreboard_fname = NULL;
-
- apr_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
-}
-
-static void spmt_os2_hooks(apr_pool_t *p)
-{
- /* TODO: set one_process properly */ one_process = 0;
-
- ap_hook_pre_config(spmt_os2_pre_config, NULL, NULL, APR_HOOK_MIDDLE);
-}
-
-static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy, const 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, const 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, const 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, const 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_THREAD_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_THREAD_LIMIT);
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- " lowering MaxClients to %d. To increase, please "
- "see the", HARD_THREAD_LIMIT);
- ap_log_error(APLOG_MARK, APLOG_STARTUP | APLOG_NOERRNO, 0, NULL,
- " HARD_THREAD_LIMIT define in %s.",
- AP_MPM_HARD_LIMITS_FILE);
- ap_daemons_limit = HARD_THREAD_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;
-}
-
-/* Stub functions until this MPM supports the connection status API */
-
-AP_DECLARE(void) ap_update_connection_status(long conn_id, const char *key, \
- const char *value)
-{
- /* NOP */
-}
-
-AP_DECLARE(void) ap_reset_connection_status(long conn_id)
-{
- /* NOP */
-}
-
-static const command_rec spmt_os2_cmds[] = {
-LISTEN_COMMANDS,
-AP_INIT_TAKE1( "StartServers", set_daemons_to_start, NULL, RSRC_CONF,
- "Number of child processes launched at server startup" ),
-AP_INIT_TAKE1( "MinSpareServers", set_min_free_servers, NULL, RSRC_CONF,
- "Minimum number of idle children, to handle request spikes" ),
-AP_INIT_TAKE1( "MaxSpareServers", set_max_free_servers, NULL, RSRC_CONF,
- "Maximum number of idle children" ),
-AP_INIT_TAKE1( "MaxClients", set_server_limit, NULL, RSRC_CONF,
- "Maximum number of children alive at the same time" ),
-{ NULL }
-};
-
-module AP_MODULE_DECLARE_DATA mpm_spmt_os2_module = {
- MPM20_MODULE_STUFF,
- NULL, /* hook to run before apache parses args */
- NULL, /* create per-directory config structure */
- NULL, /* merge per-directory config structures */
- NULL, /* create per-server config structure */
- NULL, /* merge per-server config structures */
- spmt_os2_cmds, /* command apr_table_t */
- spmt_os2_hooks, /* register_hooks */
-};
projects / apache / commitdiff