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freebsd-ports/www/apache20/files/patch-mpm-itk-20061030-01
Clement Laforet cd04e0e4c7 - Add itk MPM 
mpm-itk allows you to run each of your vhost under a separate UID and GID
  WWW: http://home.samfundet.no/~sesse/mpm-itk/
- use LD_CONFIG
2006-11-01 15:47:50 +00:00

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diff -Nur server/mpm/config.m4 server/mpm/config.m4
--- server/mpm/config.m4 2004-11-24 20:31:09.000000000 +0100
+++ server/mpm/config.m4 2006-10-30 11:58:33.000000000 +0100
@@ -1,7 +1,7 @@
AC_MSG_CHECKING(which MPM to use)
AC_ARG_WITH(mpm,
APACHE_HELP_STRING(--with-mpm=MPM,Choose the process model for Apache to use.
- MPM={beos|worker|prefork|mpmt_os2|perchild|leader|threadpool}),[
+ MPM={beos|worker|prefork|mpmt_os2|perchild|leader|threadpool|itk}),[
APACHE_MPM=$withval
],[
if test "x$APACHE_MPM" = "x"; then
@@ -12,7 +12,7 @@
apache_cv_mpm=$APACHE_MPM
-if test "$apache_cv_mpm" = "worker" -o "$apache_cv_mpm" = "perchild" -o "$apache_cv_mpm" = "leader" -o "$apache_cv_mpm" = "threadpool" ; then
+if test "$apache_cv_mpm" = "worker" -o "$apache_cv_mpm" = "perchild" -o "$apache_cv_mpm" = "leader" -o "$apache_cv_mpm" = "threadpool" -o "$apache_cv_mpm" = "itk"; then
APR_CHECK_APR_DEFINE(APR_HAS_THREADS)
if test "x$ac_cv_define_APR_HAS_THREADS" = "xno"; then
@@ -26,7 +26,7 @@
APACHE_FAST_OUTPUT(server/mpm/Makefile)
MPM_NAME=$apache_cv_mpm
-if test "$MPM_NAME" = "leader" -o "$MPM_NAME" = "threadpool" -o "$MPM_NAME" = "perchild"; then
+if test "$MPM_NAME" = "leader" -o "$MPM_NAME" = "threadpool" -o "$MPM_NAME" = "perchild" -o "$MPM_NAME" = "itk"; then
AC_MSG_WARN(You have selected an EXPERIMENTAL MPM. Be warned!)
MPM_SUBDIR_NAME=experimental/$MPM_NAME
else
diff -Nur server/mpm/experimental/itk/Makefile.in server/mpm/experimental/itk/Makefile.in
--- server/mpm/experimental/itk/Makefile.in 1970-01-01 01:00:00.000000000 +0100
+++ server/mpm/experimental/itk/Makefile.in 2006-10-29 22:39:54.000000000 +0100
@@ -0,0 +1,5 @@
+
+LTLIBRARY_NAME = libitk.la
+LTLIBRARY_SOURCES = itk.c
+
+include $(top_srcdir)/build/ltlib.mk
diff -Nur server/mpm/experimental/itk/config5.m4 server/mpm/experimental/itk/config5.m4
--- server/mpm/experimental/itk/config5.m4 1970-01-01 01:00:00.000000000 +0100
+++ server/mpm/experimental/itk/config5.m4 2006-10-29 22:39:54.000000000 +0100
@@ -0,0 +1,4 @@
+ if test "$MPM_NAME" = "itk" ; then
+ AC_CHECK_FUNCS(pthread_kill)
+ APACHE_FAST_OUTPUT(server/mpm/$MPM_SUBDIR_NAME/Makefile)
+ fi
diff -Nur server/mpm/experimental/itk/itk.c server/mpm/experimental/itk/itk.c
--- server/mpm/experimental/itk/itk.c 1970-01-01 01:00:00.000000000 +0100
+++ server/mpm/experimental/itk/itk.c 2006-10-30 18:51:03.000000000 +0100
@@ -0,0 +1,1500 @@
+/* Copyright 1999-2004 The Apache Software Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "apr.h"
+#include "apr_portable.h"
+#include "apr_strings.h"
+#include "apr_thread_proc.h"
+#include "apr_signal.h"
+
+# define _DBG(text,par...) \
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, NULL, \
+ "(itkmpm: pid=%d uid=%d) %s(): " text, \
+ getpid(), getuid(), __FUNCTION__, ##par, 0)
+
+#define APR_WANT_STDIO
+#define APR_WANT_STRFUNC
+#include "apr_want.h"
+
+#if APR_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if APR_HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#define CORE_PRIVATE
+
+#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 "scoreboard.h"
+#include "ap_mpm.h"
+#include "unixd.h"
+#include "mpm_common.h"
+#include "ap_listen.h"
+#include "ap_mmn.h"
+#include "apr_poll.h"
+
+#ifdef HAVE_BSTRING_H
+#include <bstring.h> /* for IRIX, FD_SET calls bzero() */
+#endif
+#ifdef HAVE_TIME_H
+#include <time.h>
+#endif
+#ifdef HAVE_SYS_PROCESSOR_H
+#include <sys/processor.h> /* for bindprocessor() */
+#endif
+
+#include <signal.h>
+#include <sys/times.h>
+
+/* 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 DEFAULT_SERVER_LIMIT
+#define DEFAULT_SERVER_LIMIT 256
+#endif
+
+/* Admin can't tune ServerLimit beyond MAX_SERVER_LIMIT. We want
+ * some sort of compile-time limit to help catch typos.
+ */
+#ifndef MAX_SERVER_LIMIT
+#define MAX_SERVER_LIMIT 20000
+#endif
+
+#ifndef HARD_THREAD_LIMIT
+#define HARD_THREAD_LIMIT 1
+#endif
+
+/* config globals */
+
+int ap_threads_per_child=0; /* Worker threads per child */
+static apr_proc_mutex_t *accept_mutex;
+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; /* MaxClients */
+static int server_limit = DEFAULT_SERVER_LIMIT;
+static int first_server_limit;
+static int changed_limit_at_restart;
+static int mpm_state = AP_MPMQ_STARTING;
+static ap_pod_t *pod;
+
+/*
+ * The max child slot ever assigned, preserved across restarts. Necessary
+ * to deal with MaxClients changes across AP_SIG_GRACEFUL restarts. We
+ * use this value to optimize routines that have to scan the entire scoreboard.
+ */
+int ap_max_daemons_limit = -1;
+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 */
+static apr_pool_t *pchild; /* Pool for httpd child stuff */
+
+static pid_t ap_my_pid; /* it seems silly to call getpid all the time */
+static pid_t parent_pid;
+#ifndef MULTITHREAD
+static int my_child_num;
+#endif
+ap_generation_t volatile ap_my_generation=0;
+
+#ifdef TPF
+int tpf_child = 0;
+char tpf_server_name[INETD_SERVNAME_LENGTH+1];
+#endif /* TPF */
+
+static int die_now = 0;
+
+typedef struct
+{
+ uid_t uid;
+ gid_t gid;
+ char *username;
+ int max_clients_vhost;
+} itk_server_conf;
+
+module AP_MODULE_DECLARE_DATA mpm_itk_module;
+
+#ifdef GPROF
+/*
+ * change directory for gprof to plop the gmon.out file
+ * configure in httpd.conf:
+ * GprofDir $RuntimeDir/ -> $ServerRoot/$RuntimeDir/gmon.out
+ * GprofDir $RuntimeDir/% -> $ServerRoot/$RuntimeDir/gprof.$pid/gmon.out
+ */
+static void chdir_for_gprof(void)
+{
+ core_server_config *sconf =
+ ap_get_module_config(ap_server_conf->module_config, &core_module);
+ char *dir = sconf->gprof_dir;
+ const char *use_dir;
+
+ if(dir) {
+ apr_status_t res;
+ char buf[512];
+ int len = strlen(sconf->gprof_dir) - 1;
+ if(*(dir + len) == '%') {
+ dir[len] = '\0';
+ apr_snprintf(buf, sizeof(buf), "%sgprof.%d", dir, (int)getpid());
+ }
+ use_dir = ap_server_root_relative(pconf, buf[0] ? buf : dir);
+ res = apr_dir_make(use_dir, 0755, pconf);
+ if(res != APR_SUCCESS && !APR_STATUS_IS_EEXIST(res)) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, errno, ap_server_conf,
+ "gprof: error creating directory %s", dir);
+ }
+ }
+ else {
+ use_dir = ap_server_root_relative(pconf, DEFAULT_REL_RUNTIMEDIR);
+ }
+
+ chdir(use_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)
+{
+ mpm_state = AP_MPMQ_STOPPING;
+
+ if (pchild) {
+ apr_pool_destroy(pchild);
+ }
+ ap_mpm_pod_close(pod);
+ chdir_for_gprof();
+ exit(code);
+}
+
+static void accept_mutex_on(void)
+{
+ apr_status_t rv = apr_proc_mutex_lock(accept_mutex);
+ if (rv != APR_SUCCESS) {
+ const char *msg = "couldn't grab the accept mutex";
+
+ if (ap_my_generation !=
+ ap_scoreboard_image->global->running_generation) {
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, NULL, msg);
+ clean_child_exit(0);
+ }
+ else {
+ ap_log_error(APLOG_MARK, APLOG_EMERG, rv, NULL, msg);
+ exit(APEXIT_CHILDFATAL);
+ }
+ }
+}
+
+static void accept_mutex_off(void)
+{
+ apr_status_t rv = apr_proc_mutex_unlock(accept_mutex);
+ if (rv != APR_SUCCESS) {
+ const char *msg = "couldn't release the accept mutex";
+
+ if (ap_my_generation !=
+ ap_scoreboard_image->global->running_generation) {
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, NULL, msg);
+ /* don't exit here... we have a connection to
+ * process, after which point we'll see that the
+ * generation changed and we'll exit cleanly
+ */
+ }
+ else {
+ ap_log_error(APLOG_MARK, APLOG_EMERG, rv, NULL, msg);
+ 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
+
+AP_DECLARE(apr_status_t) ap_mpm_query(int query_code, int *result)
+{
+ switch(query_code){
+ case AP_MPMQ_MAX_DAEMON_USED:
+ *result = ap_daemons_limit;
+ return APR_SUCCESS;
+ case AP_MPMQ_IS_THREADED:
+ *result = AP_MPMQ_NOT_SUPPORTED;
+ return APR_SUCCESS;
+ case AP_MPMQ_IS_FORKED:
+ *result = AP_MPMQ_DYNAMIC;
+ return APR_SUCCESS;
+ case AP_MPMQ_HARD_LIMIT_DAEMONS:
+ *result = server_limit;
+ return APR_SUCCESS;
+ case AP_MPMQ_HARD_LIMIT_THREADS:
+ *result = HARD_THREAD_LIMIT;
+ return APR_SUCCESS;
+ case AP_MPMQ_MAX_THREADS:
+ *result = 0;
+ return APR_SUCCESS;
+ case AP_MPMQ_MIN_SPARE_DAEMONS:
+ *result = ap_daemons_min_free;
+ return APR_SUCCESS;
+ case AP_MPMQ_MIN_SPARE_THREADS:
+ *result = 0;
+ return APR_SUCCESS;
+ case AP_MPMQ_MAX_SPARE_DAEMONS:
+ *result = ap_daemons_max_free;
+ return APR_SUCCESS;
+ case AP_MPMQ_MAX_SPARE_THREADS:
+ *result = 0;
+ return APR_SUCCESS;
+ case AP_MPMQ_MAX_REQUESTS_DAEMON:
+ *result = ap_max_requests_per_child;
+ return APR_SUCCESS;
+ case AP_MPMQ_MAX_DAEMONS:
+ *result = server_limit;
+ return APR_SUCCESS;
+ case AP_MPMQ_MPM_STATE:
+ *result = mpm_state;
+ return APR_SUCCESS;
+ }
+ return APR_ENOTIMPL;
+}
+
+#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(int *exitcode, apr_exit_why_e *status)
+{
+ int n, pid;
+
+ for (n = 0; n < ap_max_daemons_limit; ++n) {
+ if (ap_scoreboard_image->servers[n][0].status != SERVER_DEAD &&
+ kill((pid = ap_scoreboard_image->parent[n].pid), 0) == -1) {
+ ap_update_child_status_from_indexes(n, 0, SERVER_DEAD, NULL);
+ /* just mark it as having a successful exit status */
+ *status = APR_PROC_EXIT;
+ *exitcode = 0;
+ return(pid);
+ }
+ }
+ return 0;
+}
+#endif
+
+/*****************************************************************
+ * Connection structures and accounting...
+ */
+
+static void just_die(int sig)
+{
+ clean_child_exit(0);
+}
+
+/* volatile just in case */
+static int volatile shutdown_pending;
+static int volatile restart_pending;
+static int volatile is_graceful;
+
+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;
+}
+
+/* restart() is the signal handler for SIGHUP and AP_SIG_GRACEFUL
+ * in the parent process, unless running in ONE_PROCESS mode
+ */
+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 == AP_SIG_GRACEFUL);
+}
+
+static void set_signals(void)
+{
+#ifndef NO_USE_SIGACTION
+ struct sigaction sa;
+#endif
+
+ if (!one_process) {
+ ap_fatal_signal_setup(ap_server_conf, pconf);
+ }
+
+#ifndef NO_USE_SIGACTION
+ sigemptyset(&sa.sa_mask);
+ 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 AP_SIG_GRACEFUL while we're busy
+ * processing one */
+ sigaddset(&sa.sa_mask, SIGHUP);
+ sigaddset(&sa.sa_mask, AP_SIG_GRACEFUL);
+ 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(AP_SIG_GRACEFUL, &sa, NULL) < 0)
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "sigaction(" AP_SIG_GRACEFUL_STRING ")");
+#else
+ if (!one_process) {
+#ifdef SIGXCPU
+ apr_signal(SIGXCPU, SIG_DFL);
+#endif /* SIGXCPU */
+#ifdef SIGXFSZ
+ apr_signal(SIGXFSZ, SIG_DFL);
+#endif /* SIGXFSZ */
+ }
+
+ apr_signal(SIGTERM, sig_term);
+#ifdef SIGHUP
+ apr_signal(SIGHUP, restart);
+#endif /* SIGHUP */
+#ifdef AP_SIG_GRACEFUL
+ apr_signal(AP_SIG_GRACEFUL, restart);
+#endif /* AP_SIG_GRACEFUL */
+#ifdef SIGPIPE
+ apr_signal(SIGPIPE, SIG_IGN);
+#endif /* SIGPIPE */
+
+#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 requests_this_child;
+static int num_listensocks = 0;
+static ap_listen_rec *listensocks;
+
+int ap_graceful_stop_signalled(void)
+{
+ /* not ever called anymore... */
+ return 0;
+}
+
+
+static void child_main(int child_num_arg)
+{
+ apr_pool_t *ptrans;
+ apr_allocator_t *allocator;
+ conn_rec *current_conn;
+ apr_status_t status = APR_EINIT;
+ int i;
+ ap_listen_rec *lr;
+ int curr_pollfd, last_pollfd = 0;
+ apr_pollfd_t *pollset;
+ int offset;
+ void *csd;
+ ap_sb_handle_t *sbh;
+ apr_status_t rv;
+ apr_bucket_alloc_t *bucket_alloc;
+
+ mpm_state = AP_MPMQ_STARTING; /* for benefit of any hooks that run as this
+ * child initializes
+ */
+
+ my_child_num = child_num_arg;
+ ap_my_pid = getpid();
+ csd = NULL;
+ requests_this_child = 0;
+
+ ap_fatal_signal_child_setup(ap_server_conf);
+
+ /* Get a sub context for global allocations in this child, so that
+ * we can have cleanups occur when the child exits.
+ */
+ apr_allocator_create(&allocator);
+ apr_allocator_max_free_set(allocator, ap_max_mem_free);
+ apr_pool_create_ex(&pchild, pconf, NULL, allocator);
+ apr_allocator_owner_set(allocator, pchild);
+
+ apr_pool_create(&ptrans, pchild);
+ apr_pool_tag(ptrans, "transaction");
+
+ /* needs to be done before we switch UIDs so we have permissions */
+ ap_reopen_scoreboard(pchild, NULL, 0);
+ rv = apr_proc_mutex_child_init(&accept_mutex, ap_lock_fname, pchild);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
+ "Couldn't initialize cross-process lock in child");
+ clean_child_exit(APEXIT_CHILDFATAL);
+ }
+
+/* if (unixd_setup_child()) {
+ clean_child_exit(APEXIT_CHILDFATAL);
+ } */
+
+ ap_run_child_init(pchild, ap_server_conf);
+
+ ap_create_sb_handle(&sbh, pchild, my_child_num, 0);
+
+ (void) ap_update_child_status(sbh, SERVER_READY, (request_rec *) NULL);
+
+ /* Set up the pollfd array */
+ listensocks = apr_pcalloc(pchild,
+ sizeof(*listensocks) * (num_listensocks));
+ for (lr = ap_listeners, i = 0; i < num_listensocks; lr = lr->next, i++) {
+ listensocks[i].accept_func = lr->accept_func;
+ listensocks[i].sd = lr->sd;
+ }
+
+ pollset = apr_palloc(pchild, sizeof(*pollset) * num_listensocks);
+ pollset[0].p = pchild;
+ for (i = 0; i < num_listensocks; i++) {
+ pollset[i].desc.s = listensocks[i].sd;
+ pollset[i].desc_type = APR_POLL_SOCKET;
+ pollset[i].reqevents = APR_POLLIN;
+ }
+
+ mpm_state = AP_MPMQ_RUNNING;
+
+ bucket_alloc = apr_bucket_alloc_create(pchild);
+
+ while (!die_now) {
+ /*
+ * (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(sbh, SERVER_READY, (request_rec *) NULL);
+
+ /*
+ * Wait for an acceptable connection to arrive.
+ */
+
+ /* Lock around "accept", if necessary */
+ SAFE_ACCEPT(accept_mutex_on());
+
+ if (num_listensocks == 1) {
+ offset = 0;
+ }
+ else {
+ /* multiple listening sockets - need to poll */
+ for (;;) {
+ apr_status_t ret;
+ apr_int32_t n;
+
+ ret = apr_poll(pollset, num_listensocks, &n, -1);
+ if (ret != APR_SUCCESS) {
+ if (APR_STATUS_IS_EINTR(ret)) {
+ continue;
+ }
+ /* 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, ret, ap_server_conf,
+ "apr_poll: (listen)");
+ clean_child_exit(1);
+ }
+ /* find a listener */
+ curr_pollfd = last_pollfd;
+ do {
+ curr_pollfd++;
+ if (curr_pollfd >= num_listensocks) {
+ curr_pollfd = 0;
+ }
+ /* XXX: Should we check for POLLERR? */
+ if (pollset[curr_pollfd].rtnevents & APR_POLLIN) {
+ last_pollfd = curr_pollfd;
+ offset = curr_pollfd;
+ goto got_fd;
+ }
+ } while (curr_pollfd != last_pollfd);
+
+ continue;
+ }
+ }
+ got_fd:
+ /* if we accept() something we don't want to die, so we have to
+ * defer the exit
+ */
+ status = listensocks[offset].accept_func(&csd,
+ &listensocks[offset], ptrans);
+ SAFE_ACCEPT(accept_mutex_off()); /* unlock after "accept" */
+
+ if (status == APR_EGENERAL) {
+ /* resource shortage or should-not-occur occured */
+ clean_child_exit(1);
+ }
+ else if (status != APR_SUCCESS) {
+ continue;
+ }
+
+ /*
+ * We now have a connection, so set it up with the appropriate
+ * socket options, file descriptors, and read/write buffers.
+ */
+ {
+ pid_t pid = fork();
+ int status;
+ switch (pid) {
+ case -1:
+ ap_log_error(APLOG_MARK, APLOG_ERR, errno, NULL, "fork: Unable to fork new process");
+ break;
+ case 0: /* child */
+ apr_proc_mutex_child_init(&accept_mutex, ap_lock_fname, pchild);
+ current_conn = ap_run_create_connection(ptrans, ap_server_conf, csd, my_child_num, sbh, bucket_alloc);
+ if (current_conn) {
+ ap_process_connection(current_conn, csd);
+ ap_lingering_close(current_conn);
+ }
+ exit(0);
+ default: /* parent; just wait for child to be done */
+ if (waitpid(pid, &status, 0) != pid || !WIFEXITED(status)) {
+ if (WIFSIGNALED(status)) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, "child died with signal %u", WTERMSIG(status));
+ } else if (WEXITSTATUS(status) != 0) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, "child exited with non-zero exit status %u", WEXITSTATUS(status));
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_ERR, errno, NULL, "waitpid() failed");
+ }
+ clean_child_exit(1);
+ }
+ break;
+ }
+ }
+
+ /* Check the pod and the generation number after processing a
+ * connection so that we'll go away if a graceful restart occurred
+ * while we were processing the connection or we are the lucky
+ * idle server process that gets to die.
+ */
+ if (ap_mpm_pod_check(pod) == APR_SUCCESS) { /* selected as idle? */
+ die_now = 1;
+ }
+ else if (ap_my_generation !=
+ ap_scoreboard_image->global->running_generation) { /* restart? */
+ /* yeah, this could be non-graceful restart, in which case the
+ * parent will kill us soon enough, but why bother checking?
+ */
+ die_now = 1;
+ }
+
+ /* if we have already setuid(), die (we can't be used anyhow) */
+ if (getuid())
+ die_now = 1;
+ }
+ clean_child_exit(0);
+}
+
+
+static int make_child(server_rec *s, int slot)
+{
+ int pid;
+
+ if (slot + 1 > ap_max_daemons_limit) {
+ ap_max_daemons_limit = slot + 1;
+ }
+
+ if (one_process) {
+ apr_signal(SIGHUP, just_die);
+ /* Don't catch AP_SIG_GRACEFUL in ONE_PROCESS mode :) */
+ apr_signal(SIGINT, just_die);
+#ifdef SIGQUIT
+ apr_signal(SIGQUIT, SIG_DFL);
+#endif
+ apr_signal(SIGTERM, just_die);
+ child_main(slot);
+ }
+
+ (void) ap_update_child_status_from_indexes(slot, 0, 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_from_indexes(slot, 0, 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 HAVE_BINDPROCESSOR
+ /* by default AIX binds to a single processor
+ * this bit unbinds children which will then bind to another cpu
+ */
+ int status = bindprocessor(BINDPROCESS, (int)getpid(),
+ PROCESSOR_CLASS_ANY);
+ if (status != OK) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno,
+ ap_server_conf, "processor unbind failed %d", status);
+ }
+#endif
+ RAISE_SIGSTOP(MAKE_CHILD);
+ AP_MONCONTROL(1);
+ /* Disable the parent's signal handlers and set up proper handling in
+ * the child.
+ */
+ apr_signal(SIGHUP, just_die);
+ apr_signal(SIGTERM, just_die);
+ /* The child process doesn't do anything for AP_SIG_GRACEFUL.
+ * Instead, the pod is used for signalling graceful restart.
+ */
+ apr_signal(AP_SIG_GRACEFUL, SIG_IGN);
+ child_main(slot);
+ }
+
+ ap_scoreboard_image->parent[slot].pid = pid;
+
+ 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[i][0].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(apr_pool_t *p)
+{
+ 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 >= ap_max_daemons_limit && free_length == idle_spawn_rate)
+ break;
+ ws = &ap_scoreboard_image->servers[i][0];
+ 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;
+ }
+ }
+ ap_max_daemons_limit = last_non_dead + 1;
+ if (idle_count > ap_daemons_max_free) {
+ /* kill off one child... we use the pod because that'll cause it to
+ * shut down gracefully, in case it happened to pick up a request
+ * while we were counting
+ */
+ ap_mpm_pod_signal(pod);
+ 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_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_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) {
+#ifdef TPF
+ if (make_child(ap_server_conf, free_slots[i]) == -1) {
+ if(free_length == 1) {
+ shutdown_pending = 1;
+ ap_log_error(APLOG_MARK, APLOG_EMERG, 0, ap_server_conf,
+ "No active child processes: shutting down");
+ }
+ }
+#else
+ make_child(ap_server_conf, free_slots[i]);
+#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;
+ }
+}
+
+/*****************************************************************
+ * Executive routines.
+ */
+
+int ap_mpm_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s)
+{
+ int index;
+ int remaining_children_to_start;
+ apr_status_t rv;
+
+ ap_log_pid(pconf, ap_pid_fname);
+
+ first_server_limit = server_limit;
+ if (changed_limit_at_restart) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
+ "WARNING: Attempt to change ServerLimit "
+ "ignored during restart");
+ changed_limit_at_restart = 0;
+ }
+
+ /* Initialize cross-process accept lock */
+ ap_lock_fname = apr_psprintf(_pconf, "%s.%" APR_PID_T_FMT,
+ ap_server_root_relative(_pconf, ap_lock_fname),
+ ap_my_pid);
+
+ rv = apr_proc_mutex_create(&accept_mutex, ap_lock_fname,
+ ap_accept_lock_mech, _pconf);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
+ "Couldn't create accept lock");
+ mpm_state = AP_MPMQ_STOPPING;
+ return 1;
+ }
+
+#if APR_USE_SYSVSEM_SERIALIZE
+ if (ap_accept_lock_mech == APR_LOCK_DEFAULT ||
+ ap_accept_lock_mech == APR_LOCK_SYSVSEM) {
+#else
+ if (ap_accept_lock_mech == APR_LOCK_SYSVSEM) {
+#endif
+ rv = unixd_set_proc_mutex_perms(accept_mutex);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s,
+ "Couldn't set permissions on cross-process lock; "
+ "check User and Group directives");
+ mpm_state = AP_MPMQ_STOPPING;
+ return 1;
+ }
+ }
+
+ if (!is_graceful) {
+ if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
+ mpm_state = AP_MPMQ_STOPPING;
+ return 1;
+ }
+ /* fix the generation number in the global score; we just got a new,
+ * cleared scoreboard
+ */
+ ap_scoreboard_image->global->running_generation = ap_my_generation;
+ }
+
+ set_signals();
+
+ if (one_process) {
+ AP_MONCONTROL(1);
+ }
+
+ 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 AP_SIG_GRACEFUL). 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_NOTICE, 0, ap_server_conf,
+ "%s configured -- resuming normal operations",
+ ap_get_server_version());
+ ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf,
+ "Server built: %s", ap_get_server_built());
+#ifdef AP_MPM_WANT_SET_ACCEPT_LOCK_MECH
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
+ "AcceptMutex: %s (default: %s)",
+ apr_proc_mutex_name(accept_mutex),
+ apr_proc_mutex_defname());
+#endif
+ restart_pending = shutdown_pending = 0;
+
+ mpm_state = AP_MPMQ_RUNNING;
+
+ while (!restart_pending && !shutdown_pending) {
+ int child_slot;
+ apr_exit_why_e exitwhy;
+ int status, processed_status;
+ /* this is a memory leak, but I'll fix it later. */
+ apr_proc_t pid;
+
+ ap_wait_or_timeout(&exitwhy, &status, &pid, pconf);
+
+ /* 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.pid != -1) {
+ processed_status = ap_process_child_status(&pid, exitwhy, status);
+ if (processed_status == APEXIT_CHILDFATAL) {
+ mpm_state = AP_MPMQ_STOPPING;
+ return 1;
+ }
+
+ /* non-fatal death... note that it's gone in the scoreboard. */
+ child_slot = find_child_by_pid(&pid);
+ if (child_slot >= 0) {
+ (void) ap_update_child_status_from_indexes(child_slot, 0, SERVER_DEAD,
+ (request_rec *) NULL);
+ if (processed_status == APEXIT_CHILDSICK) {
+ /* child detected a resource shortage (E[NM]FILE, ENOBUFS, etc)
+ * cut the fork rate to the minimum
+ */
+ idle_spawn_rate = 1;
+ }
+ else 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(ap_server_conf, child_slot);
+ --remaining_children_to_start;
+ }
+#if APR_HAS_OTHER_CHILD
+ }
+ else if (apr_proc_other_child_read(&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_WARNING,
+ 0, ap_server_conf,
+ "long lost child came home! (pid %ld)", (long)pid.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(pconf);
+#ifdef TPF
+ shutdown_pending = os_check_server(tpf_server_name);
+ ap_check_signals();
+ sleep(1);
+#endif /*TPF */
+ }
+
+ mpm_state = AP_MPMQ_STOPPING;
+
+ 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, ap_server_conf, "killpg SIGTERM");
+ }
+ ap_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_INFO,
+ 0, ap_server_conf,
+ "removed PID file %s (pid=%ld)",
+ pidfile, (long)getpid());
+ }
+
+ ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
+ "caught SIGTERM, shutting down");
+ return 1;
+ }
+
+ /* we've been told to restart */
+ apr_signal(SIGHUP, 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;
+
+ if (is_graceful) {
+ ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
+ "Graceful restart requested, doing restart");
+
+ /* kill off the idle ones */
+ ap_mpm_pod_killpg(pod, ap_max_daemons_limit);
+
+ /* This is mostly for debugging... so that we know what is still
+ * gracefully dealing with existing request. This will break
+ * in a very nasty way if we ever have the scoreboard totally
+ * file-based (no shared memory)
+ */
+ for (index = 0; index < ap_daemons_limit; ++index) {
+ if (ap_scoreboard_image->servers[index][0].status != SERVER_DEAD) {
+ ap_scoreboard_image->servers[index][0].status = SERVER_GRACEFUL;
+ }
+ }
+ }
+ else {
+ /* Kill 'em off */
+ if (unixd_killpg(getpgrp(), SIGHUP) < 0) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, "killpg SIGHUP");
+ }
+ ap_reclaim_child_processes(0); /* Not when just starting up */
+ ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf,
+ "SIGHUP received. Attempting to restart");
+ }
+
+ return 0;
+}
+
+/* This really should be a post_config hook, but the error log is already
+ * redirected by that point, so we need to do this in the open_logs phase.
+ */
+static int itk_open_logs(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s)
+{
+ apr_status_t rv;
+
+ pconf = p;
+ ap_server_conf = s;
+
+ if ((num_listensocks = ap_setup_listeners(ap_server_conf)) < 1) {
+ ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_STARTUP, 0,
+ NULL, "no listening sockets available, shutting down");
+ return DONE;
+ }
+
+ if ((rv = ap_mpm_pod_open(pconf, &pod))) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT|APLOG_STARTUP, rv, NULL,
+ "Could not open pipe-of-death.");
+ return DONE;
+ }
+ return OK;
+}
+
+static int itk_pre_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp)
+{
+ static int restart_num = 0;
+ int no_detach, debug, foreground;
+ apr_status_t rv;
+
+ mpm_state = AP_MPMQ_STARTING;
+
+ debug = ap_exists_config_define("DEBUG");
+
+ if (debug) {
+ foreground = one_process = 1;
+ no_detach = 0;
+ }
+ else
+ {
+ no_detach = ap_exists_config_define("NO_DETACH");
+ one_process = ap_exists_config_define("ONE_PROCESS");
+ foreground = ap_exists_config_define("FOREGROUND");
+ }
+
+ /* sigh, want this only the second time around */
+ if (restart_num++ == 1) {
+ is_graceful = 0;
+
+ if (!one_process && !foreground) {
+ rv = apr_proc_detach(no_detach ? APR_PROC_DETACH_FOREGROUND
+ : APR_PROC_DETACH_DAEMONIZE);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL,
+ "apr_proc_detach failed");
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+ }
+
+ parent_pid = ap_my_pid = getpid();
+ }
+
+ unixd_pre_config(ptemp);
+ 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 = server_limit;
+ ap_pid_fname = DEFAULT_PIDLOG;
+ ap_lock_fname = DEFAULT_LOCKFILE;
+ ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
+ ap_extended_status = 0;
+#ifdef AP_MPM_WANT_SET_MAX_MEM_FREE
+ ap_max_mem_free = APR_ALLOCATOR_MAX_FREE_UNLIMITED;
+#endif
+
+ apr_cpystrn(ap_coredump_dir, ap_server_root, sizeof(ap_coredump_dir));
+
+ return OK;
+}
+
+static int itk_post_read(request_rec *r)
+{
+ uid_t wanted_uid;
+ gid_t wanted_gid;
+ const char *wanted_username;
+
+ itk_server_conf *sconf =
+ (itk_server_conf *) ap_get_module_config(r->server->module_config, &mpm_itk_module);
+
+ /* Enforce MaxClientsVhost. */
+ if (sconf->max_clients_vhost > 0) {
+ int i, num_other_servers = 0;
+ for (i = 0; i < ap_daemons_limit; ++i) {
+ worker_score *ws = &ap_scoreboard_image->servers[i][0];
+ if (ws->status >= SERVER_BUSY_READ && strncmp(ws->vhost, r->server->server_hostname, 31) == 0)
+ ++num_other_servers;
+ }
+
+ if (num_other_servers > sconf->max_clients_vhost) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, NULL, \
+ "MaxClientsVhost reached for %s, refusing client.",
+ r->server->server_hostname);
+ return HTTP_SERVICE_UNAVAILABLE;
+ }
+ }
+ strncpy(ap_scoreboard_image->servers[my_child_num][0].vhost, r->server->server_hostname, 31);
+ ap_scoreboard_image->servers[my_child_num][0].vhost[31] = 0;
+
+ wanted_uid = sconf->uid;
+ wanted_gid = sconf->gid;
+ wanted_username = sconf->username;
+
+ if (wanted_uid == -1 || wanted_gid == -1) {
+ wanted_uid = unixd_config.user_id;
+ wanted_gid = unixd_config.group_id;
+ wanted_username = unixd_config.user_name;
+ }
+
+ if (wanted_uid != -1 && wanted_gid != -1 && (getuid() != wanted_uid || getgid() != wanted_gid)) {
+ int err = 0;
+ if (setgid(wanted_gid)) {
+ _DBG("setgid(): %s", strerror(errno));
+ err = 1;
+ } else if (initgroups(wanted_username, wanted_gid)) {
+ _DBG("initgroups(): %s", strerror(errno));
+ err = 1;
+ } else if (setuid(wanted_uid)) {
+ _DBG("setuid(): %s", strerror(errno));
+ err = 1;
+ }
+
+ /*
+ * Most likely a case of switching uid/gid within a persistent
+ * connection; the RFCs allow us to just close the connection
+ * at anytime, so we excercise our right. :-)
+ */
+ if (err) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, NULL, \
+ "Couldn't set uid/gid, closing connection.");
+ ap_lingering_close(r->connection);
+ exit(0);
+ }
+ }
+ return OK;
+}
+
+static void itk_hooks(apr_pool_t *p)
+{
+ /* The itk open_logs phase must run before the core's, or stderr
+ * will be redirected to a file, and the messages won't print to the
+ * console.
+ */
+ static const char *const aszSucc[] = {"core.c", NULL};
+
+#ifdef AUX3
+ (void) set42sig();
+#endif
+
+ ap_hook_open_logs(itk_open_logs, NULL, aszSucc, APR_HOOK_MIDDLE);
+ /* we need to set the MPM state before other pre-config hooks use MPM query
+ * to retrieve it, so register as REALLY_FIRST
+ */
+ ap_hook_pre_config(itk_pre_config, NULL, NULL, APR_HOOK_REALLY_FIRST);
+
+ /* set the uid as fast as possible */
+ ap_hook_post_read_request(itk_post_read, NULL, NULL, APR_HOOK_REALLY_FIRST);
+
+}
+
+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, 0, NULL,
+ "WARNING: detected MinSpareServers set to non-positive.");
+ ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
+ "Resetting to 1 to avoid almost certain Apache failure.");
+ ap_log_error(APLOG_MARK, APLOG_STARTUP, 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_max_clients (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 > server_limit) {
+ ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
+ "WARNING: MaxClients of %d exceeds ServerLimit value "
+ "of %d servers,", ap_daemons_limit, server_limit);
+ ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
+ " lowering MaxClients to %d. To increase, please "
+ "see the ServerLimit", server_limit);
+ ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
+ " directive.");
+ ap_daemons_limit = server_limit;
+ }
+ else if (ap_daemons_limit < 1) {
+ ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
+ "WARNING: Require MaxClients > 0, setting to 1");
+ ap_daemons_limit = 1;
+ }
+ return NULL;
+}
+
+static const char *set_server_limit (cmd_parms *cmd, void *dummy, const char *arg)
+{
+ int tmp_server_limit;
+
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ tmp_server_limit = atoi(arg);
+ /* you cannot change ServerLimit across a restart; ignore
+ * any such attempts
+ */
+ if (first_server_limit &&
+ tmp_server_limit != server_limit) {
+ /* how do we log a message? the error log is a bit bucket at this
+ * point; we'll just have to set a flag so that ap_mpm_run()
+ * logs a warning later
+ */
+ changed_limit_at_restart = 1;
+ return NULL;
+ }
+ server_limit = tmp_server_limit;
+
+ if (server_limit > MAX_SERVER_LIMIT) {
+ ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
+ "WARNING: ServerLimit of %d exceeds compile time limit "
+ "of %d servers,", server_limit, MAX_SERVER_LIMIT);
+ ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
+ " lowering ServerLimit to %d.", MAX_SERVER_LIMIT);
+ server_limit = MAX_SERVER_LIMIT;
+ }
+ else if (server_limit < 1) {
+ ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL,
+ "WARNING: Require ServerLimit > 0, setting to 1");
+ server_limit = 1;
+ }
+ return NULL;
+}
+
+static const char *assign_user_id (cmd_parms *cmd, void *dummy, const char *user_name, const char *group_name)
+{
+ itk_server_conf *sconf =
+ (itk_server_conf *) ap_get_module_config(cmd->server->module_config, &mpm_itk_module);
+ sconf->username = strdup(user_name);
+ sconf->uid = ap_uname2id(user_name);
+ sconf->gid = ap_gname2id(group_name);
+ return NULL;
+}
+
+static const char *set_max_clients_vhost (cmd_parms *cmd, void *dummy, const char *arg)
+{
+ itk_server_conf *sconf =
+ (itk_server_conf *) ap_get_module_config(cmd->server->module_config, &mpm_itk_module);
+ sconf->max_clients_vhost = atoi(arg);
+ return NULL;
+}
+
+
+static const command_rec itk_cmds[] = {
+UNIX_DAEMON_COMMANDS,
+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_max_clients, NULL, RSRC_CONF,
+ "Maximum number of children alive at the same time"),
+AP_INIT_TAKE1("ServerLimit", set_server_limit, NULL, RSRC_CONF,
+ "Maximum value of MaxClients for this run of Apache"),
+AP_INIT_TAKE2("AssignUserID", assign_user_id, NULL, RSRC_CONF,
+ "Tie a virtual host to a specific child process."),
+AP_INIT_TAKE1("MaxClientsVHost", set_max_clients_vhost, NULL, RSRC_CONF,
+ "Maximum number of children alive at the same time for this virtual host."),
+{ NULL }
+};
+
+/* == allocate an private server config structure == */
+static void *itk_create_config(apr_pool_t *p, server_rec *s)
+{
+ itk_server_conf *c = (itk_server_conf *)
+ apr_pcalloc(p, sizeof(itk_server_conf));
+ c->uid = c->gid = -1;
+ c->max_clients_vhost = -1;
+ return c;
+}
+
+
+module AP_MODULE_DECLARE_DATA mpm_itk_module = {
+ MPM20_MODULE_STUFF,
+ ap_mpm_rewrite_args, /* hook to run before apache parses args */
+ NULL, /* create per-directory config structure */
+ NULL, /* merge per-directory config structures */
+ itk_create_config, /* create per-server config structure */
+ NULL, /* merge per-server config structures */
+ itk_cmds, /* command apr_table_t */
+ itk_hooks, /* register hooks */
+};
diff -Nur server/mpm/experimental/itk/mpm.h server/mpm/experimental/itk/mpm.h
--- server/mpm/experimental/itk/mpm.h 1970-01-01 01:00:00.000000000 +0100
+++ server/mpm/experimental/itk/mpm.h 2006-10-29 22:39:54.000000000 +0100
@@ -0,0 +1,50 @@
+/* Copyright 2000-2004 The Apache Software Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "httpd.h"
+#include "mpm_default.h"
+#include "scoreboard.h"
+#include "unixd.h"
+
+#ifndef APACHE_MPM_PREFORK_H
+#define APACHE_MPM_PREFORK_H
+
+#define PREFORK_MPM
+
+#define MPM_NAME "Prefork"
+
+#define AP_MPM_WANT_RECLAIM_CHILD_PROCESSES
+#define AP_MPM_WANT_WAIT_OR_TIMEOUT
+#define AP_MPM_WANT_PROCESS_CHILD_STATUS
+#define AP_MPM_WANT_SET_PIDFILE
+#define AP_MPM_WANT_SET_SCOREBOARD
+#define AP_MPM_WANT_SET_LOCKFILE
+#define AP_MPM_WANT_SET_MAX_REQUESTS
+#define AP_MPM_WANT_SET_COREDUMPDIR
+#define AP_MPM_WANT_SET_ACCEPT_LOCK_MECH
+#define AP_MPM_WANT_SIGNAL_SERVER
+#define AP_MPM_WANT_SET_MAX_MEM_FREE
+#define AP_MPM_WANT_FATAL_SIGNAL_HANDLER
+#define AP_MPM_DISABLE_NAGLE_ACCEPTED_SOCK
+
+#define AP_MPM_USES_POD 1
+#define MPM_CHILD_PID(i) (ap_scoreboard_image->parent[i].pid)
+#define MPM_NOTE_CHILD_KILLED(i) (MPM_CHILD_PID(i) = 0)
+#define MPM_ACCEPT_FUNC unixd_accept
+
+extern int ap_threads_per_child;
+extern int ap_max_daemons_limit;
+extern server_rec *ap_server_conf;
+#endif /* APACHE_MPM_PREFORK_H */
diff -Nur server/mpm/experimental/itk/mpm_default.h server/mpm/experimental/itk/mpm_default.h
--- server/mpm/experimental/itk/mpm_default.h 1970-01-01 01:00:00.000000000 +0100
+++ server/mpm/experimental/itk/mpm_default.h 2006-10-29 22:39:54.000000000 +0100
@@ -0,0 +1,64 @@
+/* Copyright 1999-2004 The Apache Software Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef APACHE_MPM_DEFAULT_H
+#define APACHE_MPM_DEFAULT_H
+
+/* Number of servers to spawn off by default --- also, if fewer than
+ * this free when the caretaker checks, it will spawn more.
+ */
+#ifndef DEFAULT_START_DAEMON
+#define DEFAULT_START_DAEMON 5
+#endif
+
+/* Maximum number of *free* server processes --- more than this, and
+ * they will die off.
+ */
+
+#ifndef DEFAULT_MAX_FREE_DAEMON
+#define DEFAULT_MAX_FREE_DAEMON 10
+#endif
+
+/* Minimum --- fewer than this, and more will be created */
+
+#ifndef DEFAULT_MIN_FREE_DAEMON
+#define DEFAULT_MIN_FREE_DAEMON 5
+#endif
+
+/* File used for accept locking, when we use a file */
+#ifndef DEFAULT_LOCKFILE
+#define DEFAULT_LOCKFILE DEFAULT_REL_RUNTIMEDIR "/accept.lock"
+#endif
+
+/* Where the main/parent process's pid is logged */
+#ifndef DEFAULT_PIDLOG
+#define DEFAULT_PIDLOG DEFAULT_REL_RUNTIMEDIR "/httpd.pid"
+#endif
+
+/*
+ * Interval, in microseconds, between scoreboard maintenance.
+ */
+#ifndef SCOREBOARD_MAINTENANCE_INTERVAL
+#define SCOREBOARD_MAINTENANCE_INTERVAL 1000000
+#endif
+
+/* Number of requests to try to handle in a single process. If <= 0,
+ * the children don't die off.
+ */
+#ifndef DEFAULT_MAX_REQUESTS_PER_CHILD
+#define DEFAULT_MAX_REQUESTS_PER_CHILD 10000
+#endif
+
+#endif /* AP_MPM_DEFAULT_H */
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