upload http

JIRA: BOTTLENECK-10

Change-Id: I7598427ff904df438ce77c2819ee48ac75ffa8da
Signed-off-by: hongbotian <hongbo.tianhongbo@huawei.com>

1 files changed, 2045 insertions, 0 deletions

diff --git a/rubbos/app/httpd-2.0.64/server/mpm/experimental/perchild/perchild.c b/rubbos/app/httpd-2.0.64/server/mpm/experimental/perchild/perchild.c
new file mode 100644
index 00000000..8b205beb
--- /dev/null
+++ b/rubbos/app/httpd-2.0.64/server/mpm/experimental/perchild/perchild.c
@@ -0,0 +1,2045 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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_hash.h"
+#include "apr_strings.h"
+#include "apr_pools.h"
+#include "apr_portable.h"
+#include "apr_file_io.h"
+#include "apr_signal.h"
+
+#define APR_WANT_IOVEC
+#include "apr_want.h"
+
+#if APR_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if APR_HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+
+#if !APR_HAS_THREADS
+#error The perchild MPM requires APR threads, but they are unavailable.
+#endif  
+
+#define CORE_PRIVATE 
+ 
+#include "ap_config.h"
+#include "httpd.h" 
+#include "http_main.h" 
+#include "http_log.h" 
+#include "http_config.h"    /* for read_config */ 
+#include "http_core.h"      /* for get_remote_host */ 
+#include "http_protocol.h"
+#include "http_connection.h"
+#include "ap_mpm.h"
+#include "unixd.h"
+#include "mpm_common.h"
+#include "ap_listen.h"
+#include "mpm_default.h"
+#include "mpm.h"
+#include "scoreboard.h"
+#include "util_filter.h"
+#include "apr_poll.h"
+
+#ifdef HAVE_POLL_H
+#include <poll.h>
+#endif
+#ifdef HAVE_SYS_POLL_H
+#include <sys/poll.h>
+#endif
+
+/* ### should be APR-ized */
+#include <grp.h>
+#include <pwd.h>
+#include <sys/stat.h>
+#include <sys/un.h>
+#include <setjmp.h>
+#ifdef HAVE_SYS_PROCESSOR_H
+#include <sys/processor.h> /* for bindprocessor() */
+#endif
+
+/*
+ * Define some magic numbers that we use for the state of the incomming
+ * request. These must be < 0 so they don't collide with a file descriptor.
+ */
+#define AP_PERCHILD_THISCHILD -1
+#define AP_PERCHILD_OTHERCHILD -2
+
+/* Limit on the threads per process.  Clients will be locked out if more than
+ * this * server_limit are needed.
+ *
+ * We keep this for one reason 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_THREAD_LIMIT
+#define DEFAULT_THREAD_LIMIT 64 
+#endif
+
+/* Admin can't tune ThreadLimit beyond MAX_THREAD_LIMIT.  We want
+ * some sort of compile-time limit to help catch typos.
+ */
+#ifndef MAX_THREAD_LIMIT
+#define MAX_THREAD_LIMIT 20000
+#endif 
+
+/* 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 8 
+#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
+
+/*
+ * Actual definitions of config globals
+ */
+
+static int threads_to_start = 0;         /* Worker threads per child */
+static int min_spare_threads = 0;
+static int max_spare_threads = 0;
+static int max_threads = 0;
+static int server_limit = DEFAULT_SERVER_LIMIT;
+static int first_server_limit;
+static int thread_limit = DEFAULT_THREAD_LIMIT;
+static int first_thread_limit;
+static int changed_limit_at_restart;
+static int num_daemons = 0;
+static int curr_child_num = 0;
+static int workers_may_exit = 0;
+static int requests_this_child;
+static int num_listensocks = 0;
+static ap_pod_t *pod;
+static jmp_buf jmpbuffer;
+
+struct child_info_t {
+    uid_t uid;
+    gid_t gid;
+    int input;       /* The socket descriptor */
+    int output;      /* The socket descriptor */
+};
+
+typedef struct {
+    const char *sockname;       /* The base name for the socket */
+    const char *fullsockname;   /* socket base name + extension */
+    int        input;           /* The socket descriptor */
+    int        output;          /* The socket descriptor */
+} perchild_server_conf;
+
+typedef struct child_info_t child_info_t;
+
+/* Tables used to determine the user and group each child process should
+ * run as.  The hash table is used to correlate a server name with a child
+ * process.
+ */
+static child_info_t *child_info_table;
+static int          *thread_socket_table;
+struct ap_ctable    *ap_child_table;
+
+/*
+ * The max child slot ever assigned, preserved across restarts.  Necessary
+ * to deal with NumServers changes across AP_SIG_GRACEFUL restarts.  We 
+ * use this value to optimize routines that have to scan the entire child 
+ * table.
+ *
+ * XXX - It might not be worth keeping this code in. There aren't very
+ * many child processes in this MPM.
+ */
+int ap_max_daemons_limit = -1;
+int ap_threads_per_child; /* XXX not part of API!  axe it! */
+
+module AP_MODULE_DECLARE_DATA mpm_perchild_module;
+
+static apr_file_t *pipe_of_death_in = NULL;
+static apr_file_t *pipe_of_death_out = NULL;
+static apr_thread_mutex_t *pipe_of_death_mutex;
+
+/* *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;
+
+#ifdef DEBUG_SIGSTOP
+int raise_sigstop_flags;
+#endif
+
+static apr_pool_t *pconf;              /* Pool for config stuff */
+static apr_pool_t *pchild;             /* Pool for httpd child stuff */
+static apr_pool_t *thread_pool_parent; /* Parent of per-thread pools */
+static apr_thread_mutex_t *thread_pool_parent_mutex;
+
+static int child_num;
+static unsigned int my_pid; /* Linux getpid() doesn't work except in 
+                      main thread. Use this instead */
+/* Keep track of the number of worker threads currently active */
+static int worker_thread_count;
+static apr_thread_mutex_t *worker_thread_count_mutex;
+static int *worker_thread_free_ids;
+static apr_threadattr_t *worker_thread_attr;
+
+/* Keep track of the number of idle worker threads */
+static int idle_thread_count;
+static apr_thread_mutex_t *idle_thread_count_mutex;
+
+/* Locks for accept serialization */
+#ifdef NO_SERIALIZED_ACCEPT
+#define SAFE_ACCEPT(stmt) APR_SUCCESS
+#else
+#define SAFE_ACCEPT(stmt) (stmt)
+static apr_proc_mutex_t *process_accept_mutex;
+#endif /* NO_SERIALIZED_ACCEPT */
+static apr_thread_mutex_t *thread_accept_mutex;
+
+AP_DECLARE(apr_status_t) ap_mpm_query(int query_code, int *result)
+{
+    switch(query_code){
+        case AP_MPMQ_MAX_DAEMON_USED:
+            *result = ap_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_STATIC;
+            return APR_SUCCESS;
+        case AP_MPMQ_HARD_LIMIT_DAEMONS:
+            *result = server_limit;
+            return APR_SUCCESS;
+        case AP_MPMQ_HARD_LIMIT_THREADS:
+            *result = thread_limit;
+            return APR_SUCCESS;
+        case AP_MPMQ_MAX_THREADS:
+            *result = max_threads;
+            return APR_SUCCESS;
+        case AP_MPMQ_MIN_SPARE_DAEMONS:
+            *result = 0;
+            return APR_SUCCESS;
+        case AP_MPMQ_MIN_SPARE_THREADS:    
+            *result = min_spare_threads;
+            return APR_SUCCESS;
+        case AP_MPMQ_MAX_SPARE_DAEMONS:
+            *result = 0;
+            return APR_SUCCESS;
+        case AP_MPMQ_MAX_SPARE_THREADS:
+            *result = max_spare_threads;
+            return APR_SUCCESS;
+        case AP_MPMQ_MAX_REQUESTS_DAEMON:
+            *result = ap_max_requests_per_child;
+            return APR_SUCCESS; 
+        case AP_MPMQ_MAX_DAEMONS:
+            *result = num_daemons;
+            return APR_SUCCESS;
+    }
+    return APR_ENOTIMPL;
+}
+
+/* a clean exit from a child with proper cleanup */
+static void clean_child_exit(int code)
+{
+    if (pchild) {
+        apr_pool_destroy(pchild);
+    }
+    exit(code);
+}
+
+static void just_die(int sig)
+{
+    clean_child_exit(0);
+}
+
+/*****************************************************************
+ * Connection structures and accounting...
+ */
+
+/* volatile just in case */
+static int volatile shutdown_pending;
+static int volatile restart_pending;
+static int volatile is_graceful;
+static int volatile child_fatal;
+/* we don't currently track ap_my_generation, but mod_status 
+ * references it so it must be defined */
+ap_generation_t volatile ap_my_generation=0;
+
+/*
+ * ap_start_shutdown() and ap_start_restart(), below, are a first stab at
+ * functions to initiate shutdown or restart without relying on signals. 
+ * Previously this was initiated in sig_term() and restart() signal handlers, 
+ * but we want to be able to start a shutdown/restart from other sources --
+ * e.g. on Win32, from the service manager. Now the service manager can
+ * call ap_start_shutdown() or ap_start_restart() as appropiate.  Note that
+ * these functions can also be called by the child processes, since global
+ * variables are no longer used to pass on the required action to the parent.
+ *
+ * These should only be called from the parent process itself, since the
+ * parent process will use the shutdown_pending and restart_pending variables
+ * to determine whether to shutdown or restart. The child process should
+ * call signal_parent() directly to tell the parent to die -- this will
+ * cause neither of those variable to be set, which the parent will
+ * assume means something serious is wrong (which it will be, for the
+ * child to force an exit) and so do an exit anyway.
+ */
+
+static void ap_start_shutdown(void)
+{
+    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;
+}
+
+/* do a graceful restart if graceful == 1 */
+static void ap_start_restart(int graceful)
+{
+
+    if (restart_pending == 1) {
+        /* Probably not an error - don't bother reporting it */
+        return;
+    }
+    restart_pending = 1;
+    is_graceful = graceful;
+}
+
+static void sig_term(int sig)
+{
+    ap_start_shutdown();
+}
+
+static void restart(int sig)
+{
+#ifndef WIN32
+    ap_start_restart(sig == AP_SIG_GRACEFUL);
+#else
+    ap_start_restart(1);
+#endif
+}
+
+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
+}
+
+/*****************************************************************
+ * Here follows a long bunch of generic server bookkeeping stuff...
+ */
+
+int ap_graceful_stop_signalled(void)
+{
+    /* XXX - Does this really work? - Manoj */
+    return is_graceful;
+}
+
+/*****************************************************************
+ * Child process main loop.
+ */
+
+static void process_socket(apr_pool_t *p, apr_socket_t *sock, long conn_id,
+                           apr_bucket_alloc_t *bucket_alloc)
+{
+    conn_rec *current_conn;
+    int csd;
+    apr_status_t rv;
+    int thread_num = conn_id % thread_limit;
+    ap_sb_handle_t *sbh;
+
+    if ((rv = apr_os_sock_get(&csd, sock)) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, rv, NULL, "apr_os_sock_get");
+    }
+
+    if (thread_socket_table[thread_num] < 0) {
+        ap_sock_disable_nagle(sock);
+    }
+
+    ap_create_sb_handle(&sbh, p, conn_id / thread_limit, thread_num);
+    current_conn = ap_run_create_connection(p, ap_server_conf, sock, conn_id, 
+                                            sbh, bucket_alloc);
+    if (current_conn) {
+        ap_process_connection(current_conn, sock);
+        ap_lingering_close(current_conn);
+    }
+}
+
+static int perchild_process_connection(conn_rec *c)
+{
+    ap_filter_t *f;
+    apr_bucket_brigade *bb;
+    core_net_rec *net;
+
+    apr_pool_userdata_get((void **)&bb, "PERCHILD_SOCKETS", c->pool);
+    if (bb != NULL) {
+        for (f = c->output_filters; f != NULL; f = f->next) {
+            if (!strcmp(f->frec->name, "core")) {
+                break;
+            }
+        }
+        if (f != NULL) {
+            net = f->ctx;
+            net->in_ctx = apr_palloc(c->pool, sizeof(*net->in_ctx));
+            net->in_ctx->b = bb;
+        }
+    }
+    return DECLINED;
+}
+    
+
+static void *worker_thread(apr_thread_t *, void *);
+
+/* Starts a thread as long as we're below max_threads */
+static int start_thread(void)
+{
+    apr_thread_t *thread;
+    int rc;
+
+    apr_thread_mutex_lock(worker_thread_count_mutex);
+    if (worker_thread_count < max_threads - 1) {
+        rc = apr_thread_create(&thread, worker_thread_attr, worker_thread,
+                 &worker_thread_free_ids[worker_thread_count], pchild);
+        if (rc != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK, APLOG_ALERT, rc, ap_server_conf,
+                         "apr_thread_create: unable to create worker thread");
+            /* 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 if we exit. */
+            sleep(10);
+            workers_may_exit = 1;
+            apr_thread_mutex_unlock(worker_thread_count_mutex);
+            return 0;
+        }
+        else {
+            worker_thread_count++;
+        }
+    }
+    else {
+        static int reported = 0;
+        
+        if (!reported) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, 0,
+                         ap_server_conf,
+                         "server reached MaxThreadsPerChild setting, "
+                         "consider raising the MaxThreadsPerChild or "
+                         "NumServers settings");
+            reported = 1;
+        }
+        apr_thread_mutex_unlock(worker_thread_count_mutex);
+        return 0;
+    }
+    apr_thread_mutex_unlock(worker_thread_count_mutex);
+    return 1;
+
+}
+
+/* Sets workers_may_exit if we received a character on the pipe_of_death */
+static apr_status_t check_pipe_of_death(void **csd, ap_listen_rec *lr,
+                                        apr_pool_t *ptrans)
+{
+    apr_thread_mutex_lock(pipe_of_death_mutex);
+    if (!workers_may_exit) {
+        int ret;
+        char pipe_read_char;
+        apr_size_t n = 1;
+
+        ret = apr_recv(lr->sd, &pipe_read_char, &n);
+        if (APR_STATUS_IS_EAGAIN(ret)) {
+            /* It lost the lottery. It must continue to suffer
+             * through a life of servitude. */
+        }
+        else {
+            /* It won the lottery (or something else is very
+             * wrong). Embrace death with open arms. */
+            workers_may_exit = 1;
+        }
+    }
+    apr_thread_mutex_unlock(pipe_of_death_mutex);
+    return APR_SUCCESS;
+}
+
+static apr_status_t receive_from_other_child(void **csd, ap_listen_rec *lr,
+                                             apr_pool_t *ptrans)
+{
+    struct msghdr msg;
+    struct cmsghdr *cmsg;
+    char buffer[HUGE_STRING_LEN * 2], *headers, *body;
+    int headerslen, bodylen;
+    struct iovec iov;
+    int ret, dp;
+    apr_os_sock_t sd;
+    apr_bucket_alloc_t *alloc = apr_bucket_alloc_create(ptrans);
+    apr_bucket_brigade *bb = apr_brigade_create(ptrans, alloc);
+    apr_bucket *bucket;
+
+    apr_os_sock_get(&sd, lr->sd);
+
+    iov.iov_base = buffer;
+    iov.iov_len = sizeof(buffer);
+
+    msg.msg_name = NULL;
+    msg.msg_namelen = 0;
+    msg.msg_iov = &iov;
+    msg.msg_iovlen = 1;
+
+    cmsg = apr_palloc(ptrans, sizeof(*cmsg) + sizeof(sd));
+    cmsg->cmsg_len = sizeof(*cmsg) + sizeof(sd);
+    msg.msg_control = cmsg;
+    msg.msg_controllen = cmsg->cmsg_len;
+
+    ret = recvmsg(sd, &msg, 0);
+
+    memcpy(&dp, CMSG_DATA(cmsg), sizeof(dp));
+
+    *csd = NULL; /* tell apr_os_sock_put() to allocate new apr_socket_t */
+    apr_os_sock_put((apr_socket_t **)csd, &dp, ptrans);
+
+    bucket = apr_bucket_eos_create(alloc);
+    APR_BRIGADE_INSERT_HEAD(bb, bucket);
+    bucket = apr_bucket_socket_create(*csd, alloc);
+    APR_BRIGADE_INSERT_HEAD(bb, bucket);
+
+    body = strchr(iov.iov_base, 0);
+    if (!body) {
+        return 1;
+    }
+
+    body++;
+    bodylen = strlen(body);
+
+    headers = iov.iov_base;
+    headerslen = body - headers;
+
+    bucket = apr_bucket_heap_create(body, bodylen, NULL, alloc);
+    APR_BRIGADE_INSERT_HEAD(bb, bucket);
+    bucket = apr_bucket_heap_create(headers, headerslen, NULL, alloc);
+    APR_BRIGADE_INSERT_HEAD(bb, bucket);
+
+    apr_pool_userdata_set(bb, "PERCHILD_SOCKETS", NULL, ptrans);
+
+    return 0;
+}
+
+/* idle_thread_count should be incremented before starting a worker_thread */
+
+static void *worker_thread(apr_thread_t *thd, void *arg)
+{
+    void *csd;
+    apr_pool_t *tpool;      /* Pool for this thread           */
+    apr_pool_t *ptrans;     /* Pool for per-transaction stuff */
+    volatile int thread_just_started = 1;
+    int srv;
+    int thread_num = *((int *) arg);
+    long conn_id = child_num * thread_limit + thread_num;
+    apr_pollfd_t *pollset;
+    apr_status_t rv;
+    ap_listen_rec *lr, *last_lr = ap_listeners;
+    int n;
+    apr_bucket_alloc_t *bucket_alloc;
+
+    apr_thread_mutex_lock(thread_pool_parent_mutex);
+    apr_pool_create(&tpool, thread_pool_parent);
+    apr_thread_mutex_unlock(thread_pool_parent_mutex);
+    apr_pool_create(&ptrans, tpool);
+
+    (void) ap_update_child_status_from_indexes(child_num, thread_num, 
+                                               SERVER_STARTING,
+                                               (request_rec *) NULL);
+
+    bucket_alloc = apr_bucket_alloc_create(apr_thread_pool_get(thd));
+
+    apr_poll_setup(&pollset, num_listensocks, tpool);
+    for(lr = ap_listeners; lr != NULL; lr = lr->next) {
+        int fd;
+        apr_poll_socket_add(pollset, lr->sd, APR_POLLIN);
+
+        apr_os_sock_get(&fd, lr->sd);
+    }
+
+    while (!workers_may_exit) {
+        workers_may_exit |= ((ap_max_requests_per_child != 0)
+                            && (requests_this_child <= 0));
+        if (workers_may_exit) break;
+        if (!thread_just_started) {
+            apr_thread_mutex_lock(idle_thread_count_mutex);
+            if (idle_thread_count < max_spare_threads) {
+                idle_thread_count++;
+                apr_thread_mutex_unlock(idle_thread_count_mutex);
+            }
+            else {
+                apr_thread_mutex_unlock(idle_thread_count_mutex);
+                break;
+            }
+        }
+        else {
+            thread_just_started = 0;
+        }
+
+        (void) ap_update_child_status_from_indexes(child_num, thread_num, 
+                                                   SERVER_READY,
+                                                   (request_rec *) NULL);
+
+        apr_thread_mutex_lock(thread_accept_mutex);
+        if (workers_may_exit) {
+            apr_thread_mutex_unlock(thread_accept_mutex);
+            break;
+        }
+        if ((rv = SAFE_ACCEPT(apr_proc_mutex_lock(process_accept_mutex)))
+            != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
+                         "apr_proc_mutex_lock failed. Attempting to shutdown "
+                         "process gracefully.");
+            workers_may_exit = 1;
+        }
+
+        while (!workers_may_exit) {
+            apr_int16_t event;
+            srv = apr_poll(pollset, num_listensocks, &n, -1);
+
+            if (srv != APR_SUCCESS) {
+                if (APR_STATUS_IS_EINTR(srv)) {
+                    continue;
+                }
+
+                /* apr_poll() will only return errors in catastrophic
+                 * circumstances. Let's try exiting gracefully, for now. */
+                ap_log_error(APLOG_MARK, APLOG_ERR, srv, (const server_rec *)
+                             ap_server_conf, "apr_poll: (listen)");
+                workers_may_exit = 1;
+            }
+            if (workers_may_exit) break;
+
+            /* find a listener */
+            lr = last_lr;
+            do {
+                lr = lr->next;
+                if (lr == NULL) {
+                    lr = ap_listeners;
+                }
+                /* XXX: Should we check for POLLERR? */
+                apr_poll_revents_get(&event, lr->sd, pollset);
+                if (event & (APR_POLLIN)) {
+                    last_lr = lr;
+                    goto got_fd;
+                }
+            } while (lr != last_lr);
+        }
+    got_fd:
+        if (!workers_may_exit) {
+            rv = lr->accept_func(&csd, lr, ptrans);
+            if (rv == APR_EGENERAL) {
+                /* E[NM]FILE, ENOMEM, etc */
+                workers_may_exit = 1;
+            }
+            if ((rv = SAFE_ACCEPT(apr_proc_mutex_unlock(process_accept_mutex)))
+                != APR_SUCCESS) {
+                ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
+                             "apr_proc_mutex_unlock failed. Attempting to shutdown "
+                             "process gracefully.");
+                workers_may_exit = 1;
+            }
+            apr_thread_mutex_unlock(thread_accept_mutex);
+            apr_thread_mutex_lock(idle_thread_count_mutex);
+            if (idle_thread_count > min_spare_threads) {
+                idle_thread_count--;
+            }
+            else {
+                if (!start_thread()) {
+                    idle_thread_count--;
+                }
+            }
+            apr_thread_mutex_unlock(idle_thread_count_mutex);
+            if (setjmp(jmpbuffer) != 1) {
+                process_socket(ptrans, csd, conn_id, bucket_alloc);
+            }
+            else {
+                thread_socket_table[thread_num] = AP_PERCHILD_THISCHILD;
+            }  
+            requests_this_child--;
+        }
+        else {
+            if ((rv = SAFE_ACCEPT(apr_proc_mutex_unlock(process_accept_mutex)))
+                != APR_SUCCESS) {
+                ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
+                             "apr_proc_mutex_unlock failed. Attempting to shutdown "
+                             "process gracefully.");
+                workers_may_exit = 1;
+            }
+            apr_thread_mutex_unlock(thread_accept_mutex);
+            apr_thread_mutex_lock(idle_thread_count_mutex);
+            idle_thread_count--;
+            apr_thread_mutex_unlock(idle_thread_count_mutex);
+        break;
+        }
+        apr_pool_clear(ptrans);
+    }
+
+    apr_thread_mutex_lock(thread_pool_parent_mutex);
+    ap_update_child_status_from_indexes(child_num, thread_num, SERVER_DEAD,
+                                        (request_rec *) NULL);
+    apr_pool_destroy(tpool);
+    apr_thread_mutex_unlock(thread_pool_parent_mutex);
+    apr_thread_mutex_lock(worker_thread_count_mutex);
+    worker_thread_count--;
+    worker_thread_free_ids[worker_thread_count] = thread_num;
+    if (worker_thread_count == 0) {
+        /* All the threads have exited, now finish the shutdown process
+         * by signalling the sigwait thread */
+        kill(my_pid, SIGTERM);
+    }
+    apr_thread_mutex_unlock(worker_thread_count_mutex);
+
+    apr_bucket_alloc_destroy(bucket_alloc);
+
+    return NULL;
+}
+
+
+
+/* Set group privileges.
+ *
+ * Note that we use the username as set in the config files, rather than
+ * the lookup of to uid --- the same uid may have multiple passwd entries,
+ * with different sets of groups for each.
+ */
+
+static int set_group_privs(uid_t uid, gid_t gid)
+{
+    if (!geteuid()) {
+        const char *name;
+
+        /* Get username if passed as a uid */
+
+        struct passwd *ent;
+
+        if ((ent = getpwuid(uid)) == NULL) {
+            ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
+                         "getpwuid: couldn't determine user name from uid %u, "
+                         "you probably need to modify the User directive",
+                         (unsigned)uid);
+            return -1;
+        }
+
+        name = ent->pw_name;
+
+        /*
+         * Set the GID before initgroups(), since on some platforms
+         * setgid() is known to zap the group list.
+         */
+        if (setgid(gid) == -1) {
+            ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
+                         "setgid: unable to set group id to Group %u",
+                         (unsigned)gid);
+            return -1;
+        }
+
+        /* Reset `groups' attributes. */
+
+        if (initgroups(name, gid) == -1) {
+            ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
+                         "initgroups: unable to set groups for User %s "
+                         "and Group %u", name, (unsigned)gid);
+            return -1;
+        }
+    }
+    return 0;
+}
+
+
+static int perchild_setup_child(int childnum)
+{
+    child_info_t *ug = &child_info_table[childnum];
+
+    if (ug->uid == -1 && ug->gid == -1) {
+        return unixd_setup_child();
+    }
+    if (set_group_privs(ug->uid, ug->gid)) {
+        return -1;
+    }
+    /* Only try to switch if we're running as root */
+    if (!geteuid()
+        && (
+#ifdef _OSD_POSIX
+            os_init_job_environment(server_conf, unixd_config.user_name,
+                                    one_process) != 0 ||
+#endif
+            setuid(ug->uid) == -1)) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT, errno, NULL,
+                     "setuid: unable to change to uid: %ld",
+                     (long) ug->uid);
+        return -1;
+    }
+    return 0;
+}
+
+static int check_signal(int signum)
+{
+    switch (signum) {
+    case SIGTERM:
+    case SIGINT:
+        just_die(signum);
+        return 1;
+    }
+    return 0;
+}                                                                               
+
+typedef struct perchild_header {
+    char *headers;
+    apr_pool_t *p;
+} perchild_header;
+
+/* Send a single HTTP header field to the client.  Note that this function
+ * is used in calls to table_do(), so their interfaces are co-dependent.
+ * In other words, don't change this one without checking table_do in alloc.c.
+ * It returns true unless there was a write error of some kind.
+ */
+static int perchild_header_field(perchild_header *h,
+                             const char *fieldname, const char *fieldval)
+{
+    apr_pstrcat(h->p, h->headers, fieldname, ": ", fieldval, CRLF, NULL); 
+    return 1;
+}
+
+
+static void child_main(int child_num_arg)
+{
+    int i;
+    apr_status_t rv;
+    apr_socket_t *sock = NULL;
+    ap_listen_rec *lr;
+    
+    my_pid = getpid();
+    ap_fatal_signal_child_setup(ap_server_conf);
+    child_num = child_num_arg;
+    apr_pool_create(&pchild, pconf);
+
+    for (lr = ap_listeners ; lr->next != NULL; lr = lr->next) {
+        continue;
+    }
+
+    apr_os_sock_put(&sock, &child_info_table[child_num].input, pconf);
+    lr->next = apr_palloc(pconf, sizeof(*lr));
+    lr->next->sd = sock;
+    lr->next->active = 1;
+    lr->next->accept_func = receive_from_other_child;
+    lr->next->next = NULL;
+    lr = lr->next;
+    num_listensocks++;
+
+    /*stuff to do before we switch id's, so we have permissions.*/
+
+    rv = SAFE_ACCEPT(apr_proc_mutex_child_init(&process_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 (perchild_setup_child(child_num)) {
+        clean_child_exit(APEXIT_CHILDFATAL);
+    }
+
+    ap_run_child_init(pchild, ap_server_conf);
+
+    /*done with init critical section */
+
+    apr_setup_signal_thread();
+
+    requests_this_child = ap_max_requests_per_child;
+    
+
+    /* Setup worker threads */
+
+    if (threads_to_start > max_threads) {
+        threads_to_start = max_threads;
+    }
+    idle_thread_count = threads_to_start;
+    worker_thread_count = 0;
+    worker_thread_free_ids = (int *)apr_pcalloc(pchild, thread_limit * sizeof(int));
+    for (i = 0; i < max_threads; i++) {
+        worker_thread_free_ids[i] = i;
+    }
+    apr_pool_create(&thread_pool_parent, pchild);
+    apr_thread_mutex_create(&thread_pool_parent_mutex, 
+                    APR_THREAD_MUTEX_DEFAULT, pchild);
+    apr_thread_mutex_create(&idle_thread_count_mutex, 
+                    APR_THREAD_MUTEX_DEFAULT, pchild);
+    apr_thread_mutex_create(&worker_thread_count_mutex,
+                    APR_THREAD_MUTEX_DEFAULT, pchild);
+    apr_thread_mutex_create(&pipe_of_death_mutex,
+                    APR_THREAD_MUTEX_DEFAULT, pchild);
+    apr_thread_mutex_create(&thread_accept_mutex,
+                    APR_THREAD_MUTEX_DEFAULT, pchild);
+
+    apr_threadattr_create(&worker_thread_attr, pchild);
+    apr_threadattr_detach_set(worker_thread_attr, 1);                                     
+
+    /* We are creating worker threads right now */
+    for (i=0; i < threads_to_start; i++) {
+        /* start_thread shouldn't fail here */
+        if (!start_thread()) {
+            break;
+        }
+    }
+
+    apr_signal_thread(check_signal);
+}
+
+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) {
+        set_signals();
+        ap_child_table[slot].pid = getpid();
+        ap_child_table[slot].status = SERVER_ALIVE;
+        child_main(slot);
+    }
+    (void) ap_update_child_status_from_indexes(slot, 0, SERVER_STARTING,
+                                               (request_rec *) NULL);
+
+    if ((pid = fork()) == -1) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, errno, s,
+                     "fork: Unable to fork new process");
+        /* 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);
+
+        /* XXX - For an unthreaded server, a signal handler will be necessary
+         * apr_signal(SIGTERM, just_die);
+         */
+        child_main(slot);
+        clean_child_exit(0);
+    }
+    /* else */
+    ap_child_table[slot].pid = pid;
+    ap_child_table[slot].status = SERVER_ALIVE;
+
+    return 0;
+}
+
+/* start up a bunch of children */
+static int startup_children(int number_to_start)
+{
+    int i;
+
+    for (i = 0; number_to_start && i < num_daemons; ++i) {
+        if (ap_child_table[i].pid) {
+            continue;
+        }
+        if (make_child(ap_server_conf, i) < 0) {
+            break;
+        }
+        --number_to_start;
+    }
+    return number_to_start;
+}
+
+
+/*
+ * spawn_rate is the number of children that will be spawned on the
+ * next maintenance cycle if there aren't enough servers.  It is
+ * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
+ * without the need to spawn.
+ */
+static int spawn_rate = 1;
+#ifndef MAX_SPAWN_RATE
+#define MAX_SPAWN_RATE  (32)
+#endif
+static int hold_off_on_exponential_spawning;
+
+static void perform_child_maintenance(void)
+{
+    int i;
+    int free_length;
+    int free_slots[MAX_SPAWN_RATE];
+    int last_non_dead = -1;
+
+    /* initialize the free_list */
+    free_length = 0;
+    
+    for (i = 0; i < num_daemons; ++i) {
+        if (ap_child_table[i].pid == 0) {
+            if (free_length < spawn_rate) {
+                free_slots[free_length] = i;
+                ++free_length;
+            }
+        }
+        else {
+            last_non_dead = i;
+        }
+
+        if (i >= ap_max_daemons_limit && free_length >= spawn_rate) {
+            break;
+        }
+    }
+    ap_max_daemons_limit = last_non_dead + 1;
+
+    if (free_length > 0) {
+        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 (spawn_rate < MAX_SPAWN_RATE) {
+            spawn_rate *= 2;
+        }
+    }
+    else {
+        spawn_rate = 1;
+    }
+}
+
+static void server_main_loop(int remaining_children_to_start)
+{
+    int child_slot;
+    apr_exit_why_e exitwhy;
+    int status;
+    apr_proc_t pid;
+    int i;
+
+    while (!restart_pending && !shutdown_pending) {
+        ap_wait_or_timeout(&exitwhy, &status, &pid, pconf);
+        
+        if (pid.pid != -1) {
+            if (ap_process_child_status(&pid, exitwhy, status)
+                == APEXIT_CHILDFATAL) {
+                shutdown_pending = 1;
+                child_fatal = 1;
+                return;
+            }
+            /* non-fatal death... note that it's gone in the child table and
+             * clean out the status table. */
+            child_slot = -1;
+            for (i = 0; i < ap_max_daemons_limit; ++i) {
+                if (ap_child_table[i].pid == pid.pid) {
+                    child_slot = i;
+                    break;
+                }
+            }
+            if (child_slot >= 0) {
+                ap_child_table[child_slot].pid = 0;
+                ap_update_child_status_from_indexes(child_slot, i, SERVER_DEAD,
+                                                    (request_rec *) NULL);
+
+                
+                if (remaining_children_to_start
+                    && child_slot < num_daemons) {
+                    /* 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
+                * child table.  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.
+             */
+            remaining_children_to_start = \
+                startup_children(remaining_children_to_start);
+            /* 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_child_maintenance();
+    }
+}
+
+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 rv;
+    apr_size_t one = 1;
+    ap_listen_rec *lr;
+    apr_socket_t *sock = NULL;
+    int fd;
+
+    ap_log_pid(pconf, ap_pid_fname);
+
+    first_server_limit = server_limit;
+    first_thread_limit = thread_limit;
+    if (changed_limit_at_restart) {
+        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
+                     "WARNING: Attempt to change ServerLimit or ThreadLimit "
+                     "ignored during restart");
+        changed_limit_at_restart = 0;
+    }
+
+    ap_server_conf = s;
+
+    if ((ap_accept_lock_mech == APR_LOCK_SYSVSEM) || 
+        (ap_accept_lock_mech == APR_LOCK_POSIXSEM)) {
+        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s,
+                     "Server configured for an accept lock mechanism that "
+                     "cannot be used with perchild.  Falling back to FCNTL.");
+        ap_accept_lock_mech = APR_LOCK_FCNTL;
+    }
+
+    /* Initialize cross-process accept lock */
+    ap_lock_fname = apr_psprintf(_pconf, "%s.%u",
+                                 ap_server_root_relative(_pconf, ap_lock_fname),
+                                 my_pid);
+    rv = SAFE_ACCEPT(apr_proc_mutex_create(&process_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 cross-process lock");
+        return 1;
+    }
+
+    if (!is_graceful) {
+        if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
+            return 1;
+        }
+    }
+    /* Initialize the child table */
+    if (!is_graceful) {
+        for (i = 0; i < server_limit; i++) {
+            ap_child_table[i].pid = 0;
+        }
+    }
+
+    /* We need to put the new listeners at the end of the ap_listeners
+     * list.  If we don't, then the pool will be cleared before the
+     * open_logs phase is called for the second time, and ap_listeners
+     * will have only invalid data.  If that happens, then the sockets
+     * that we opened using make_sock() will be lost, and the server
+     * won't start.
+     */
+    for (lr = ap_listeners ; lr->next != NULL; lr = lr->next) {
+        continue;
+    }
+
+    apr_os_file_get(&fd, pipe_of_death_in);
+    apr_os_sock_put(&sock, &fd, pconf);
+    lr->next = apr_palloc(pconf, sizeof(*lr));
+    lr->next->sd = sock;
+    lr->next->active = 1;
+    lr->next->accept_func = check_pipe_of_death;
+    lr->next->next = NULL;
+    lr = lr->next;
+    num_listensocks++;
+
+    set_signals();
+
+    /* 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 = num_daemons;
+    if (!is_graceful) {
+        remaining_children_to_start = \
+            startup_children(remaining_children_to_start);
+    }
+    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(process_accept_mutex),
+		apr_proc_mutex_defname());
+#endif
+    restart_pending = shutdown_pending = 0;
+
+    server_main_loop(remaining_children_to_start);
+
+    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 */
+
+        if (!child_fatal) {
+            /* 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;
+    }
+
+    if (is_graceful) {
+        char char_of_death = '!';
+
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, 0,
+                     ap_server_conf, AP_SIG_GRACEFUL_STRING " received.  "
+                     "Doing graceful restart");
+
+        /* This is mostly for debugging... so that we know what is still
+         * gracefully dealing with existing request.
+         */
+    
+        for (i = 0; i < num_daemons; ++i) {
+            if (ap_child_table[i].pid) {
+                ap_child_table[i].status = SERVER_DYING;
+            } 
+        }
+        /* give the children the signal to die */
+        for (i = 0; i < num_daemons;) {
+            if ((rv = apr_file_write(pipe_of_death_out, &char_of_death,
+                                     &one)) != APR_SUCCESS) {
+                if (APR_STATUS_IS_EINTR(rv)) continue;
+                ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf,
+                             "write pipe_of_death");
+            }
+            i++;
+        }
+    }
+    else {
+        /* Kill 'em all.  Since the child acts the same on the parents SIGTERM 
+         * and a SIGHUP, we may as well use the same signal, because some user
+         * pthreads are stealing signals from us left and right.
+         */
+        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 */
+        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 perchild_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;
+    }
+
+    ap_log_pid(pconf, ap_pid_fname);
+
+    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;
+    }
+
+    if ((rv = apr_file_pipe_create(&pipe_of_death_in, &pipe_of_death_out,
+                                   pconf)) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, rv,
+                     (const server_rec*) ap_server_conf,
+                     "apr_file_pipe_create (pipe_of_death)");
+        exit(1);
+    }
+    if ((rv = apr_file_pipe_timeout_set(pipe_of_death_in, 0)) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, rv,
+                     (const server_rec*) ap_server_conf,
+                     "apr_file_pipe_timeout_set (pipe_of_death)");
+        exit(1);
+    }
+
+    return OK;
+}
+
+static int perchild_pre_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp)
+{
+    static int restart_num = 0;
+    int no_detach, debug, foreground;
+    ap_directive_t *pdir;
+    int i;
+    int tmp_server_limit = DEFAULT_SERVER_LIMIT;
+    int tmp_thread_limit = DEFAULT_THREAD_LIMIT;
+    apr_status_t rv;
+
+    debug = ap_exists_config_define("DEBUG");
+
+    if (debug) {
+        foreground = one_process = 1;
+        no_detach = 0;
+    }
+    else {
+        one_process = ap_exists_config_define("ONE_PROCESS");
+        no_detach = ap_exists_config_define("NO_DETACH");
+        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;
+            }                  
+        }
+
+        my_pid = getpid();
+    }
+
+    unixd_pre_config(ptemp);
+    ap_listen_pre_config();
+    num_daemons = DEFAULT_NUM_DAEMON;
+    threads_to_start = DEFAULT_START_THREAD;
+    min_spare_threads = DEFAULT_MIN_SPARE_THREAD;
+    max_spare_threads = DEFAULT_MAX_SPARE_THREAD;
+    max_threads = thread_limit;
+    ap_pid_fname = DEFAULT_PIDLOG;
+    ap_lock_fname = DEFAULT_LOCKFILE;
+    ap_max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
+    curr_child_num = 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));
+
+    /* we need to know ServerLimit and ThreadLimit before we start processing
+     * the tree because we need to already have allocated child_info_table
+     */
+    for (pdir = ap_conftree; pdir != NULL; pdir = pdir->next) {
+        if (!strcasecmp(pdir->directive, "ServerLimit")) {
+            if (atoi(pdir->args) > tmp_server_limit) {
+                tmp_server_limit = atoi(pdir->args);
+                if (tmp_server_limit > MAX_SERVER_LIMIT) {
+                    tmp_server_limit = MAX_SERVER_LIMIT;
+                }
+            }
+        }
+        else if (!strcasecmp(pdir->directive, "ThreadLimit")) {
+            if (atoi(pdir->args) > tmp_thread_limit) {
+                tmp_thread_limit = atoi(pdir->args);
+                if (tmp_thread_limit > MAX_THREAD_LIMIT) {
+                    tmp_thread_limit = MAX_THREAD_LIMIT;
+                }
+            }
+        }
+    }
+
+    child_info_table = (child_info_t *)apr_pcalloc(p, tmp_server_limit * sizeof(child_info_t));
+    for (i = 0; i < tmp_server_limit; i++) {
+        child_info_table[i].uid = -1;
+        child_info_table[i].gid = -1;
+        child_info_table[i].input = -1;
+        child_info_table[i].output = -1;
+    }
+
+    return OK;
+}
+
+static int pass_request(request_rec *r)
+{
+    int rv;
+    apr_socket_t *thesock = ap_get_module_config(r->connection->conn_config, &core_module);
+    struct msghdr msg;
+    struct cmsghdr *cmsg;
+    int sfd;
+    struct iovec iov[2];
+    conn_rec *c = r->connection;
+    apr_bucket_brigade *bb = apr_brigade_create(r->pool, c->bucket_alloc);
+    apr_bucket_brigade *sockbb;
+    char request_body[HUGE_STRING_LEN] = "\0";
+    apr_size_t l = sizeof(request_body);
+    perchild_header h;
+    apr_bucket *sockbuck;
+    perchild_server_conf *sconf = (perchild_server_conf *)
+                            ap_get_module_config(r->server->module_config, 
+                                                 &mpm_perchild_module);
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, 
+                 "passing request to another child.  Vhost: %s, child %d %d",
+                 apr_table_get(r->headers_in, "Host"), child_num, sconf->output);
+    ap_get_brigade(r->connection->input_filters, bb, AP_MODE_EXHAUSTIVE, APR_NONBLOCK_READ,
+                   0);
+
+    for (sockbuck = APR_BRIGADE_FIRST(bb); sockbuck != APR_BRIGADE_SENTINEL(bb);
+         sockbuck = APR_BUCKET_NEXT(sockbuck)) {
+        if (APR_BUCKET_IS_SOCKET(sockbuck)) {
+            break;
+        }
+    }
+    
+    if (!sockbuck) {
+    }
+    sockbb = apr_brigade_split(bb, sockbuck); 
+
+    if (apr_brigade_flatten(bb, request_body, &l) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, 
+                     "Unable to flatten brigade, declining request");
+        return DECLINED;
+    }
+
+    apr_os_sock_get(&sfd, thesock);
+
+    h.p = r->pool;
+    h.headers = apr_pstrcat(h.p, r->the_request, CRLF, "Host: ", r->hostname, 
+                            CRLF, NULL);
+    apr_table_do((int (*) (void *, const char *, const char *))
+                 perchild_header_field, (void *) &h, r->headers_in, NULL); 
+    h.headers = apr_pstrcat(h.p, h.headers, CRLF, NULL);
+
+    iov[0].iov_base = h.headers;
+    iov[0].iov_len = strlen(h.headers) + 1;
+    iov[1].iov_base = request_body;
+    iov[1].iov_len = l + 1;
+
+    msg.msg_name = NULL;
+    msg.msg_namelen = 0;
+    msg.msg_iov = iov;
+    msg.msg_iovlen = 2;
+
+    cmsg = apr_palloc(r->pool, sizeof(*cmsg) + sizeof(sfd));
+    cmsg->cmsg_len = sizeof(*cmsg) + sizeof(sfd);
+    cmsg->cmsg_level = SOL_SOCKET;
+    cmsg->cmsg_type = SCM_RIGHTS;
+
+    memcpy(CMSG_DATA(cmsg), &sfd, sizeof(sfd));
+
+    msg.msg_control = cmsg;
+    msg.msg_controllen = cmsg->cmsg_len;
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, 
+                 "Writing message to %d, passing sd:  %d", sconf->output, sfd);
+
+    if ((rv = sendmsg(sconf->output, &msg, 0)) == -1) {
+        apr_pool_destroy(r->pool);
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, 
+                 "Writing message failed %d %d", rv, errno);
+        return -1;
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, 
+                 "Writing message succeeded %d", rv);
+
+    apr_pool_destroy(r->pool);
+    return 1;
+}
+
+static char *make_perchild_socket(const char *fullsockname, int sd[2])
+{
+    socketpair(PF_UNIX, SOCK_STREAM, 0, sd);
+    return NULL;
+}
+
+static int perchild_post_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s)
+{
+    int i;
+    server_rec *sr;
+    perchild_server_conf *sconf;
+    int def_sd[2];
+
+    def_sd[0] = -1;
+    def_sd[1] = -1;
+
+    for (sr = s; sr; sr = sr->next) {
+        sconf = (perchild_server_conf *)ap_get_module_config(sr->module_config,
+                                                      &mpm_perchild_module);
+
+        if (sconf->input == -1) {
+            sconf->fullsockname = apr_pstrcat(sr->process->pool, 
+                                             sconf->sockname, ".DEFAULT", NULL);
+            if (def_sd[0] == -1) {
+                if (!make_perchild_socket(sconf->fullsockname, def_sd)) {
+                    /* log error */
+                }
+            }
+            sconf->input = def_sd[0];
+            sconf->output = def_sd[1];
+        }
+    }
+
+    for (i = 0; i < num_daemons; i++) {
+        if (child_info_table[i].uid == -1) {
+            child_info_table[i].input = def_sd[0];
+            child_info_table[i].output = def_sd[1];
+        }
+    }
+
+    thread_socket_table = (int *)apr_pcalloc(p, thread_limit * sizeof(int));
+    for (i = 0; i < thread_limit; i++) {
+        thread_socket_table[i] = AP_PERCHILD_THISCHILD;
+    }
+    ap_child_table = (ap_ctable *)apr_pcalloc(p, server_limit * sizeof(ap_ctable));
+
+    return OK;
+}
+
+static int perchild_post_read(request_rec *r)
+{
+    int thread_num = r->connection->id % thread_limit;
+    perchild_server_conf *sconf = (perchild_server_conf *)
+                            ap_get_module_config(r->server->module_config, 
+                                                 &mpm_perchild_module);
+
+    if (thread_socket_table[thread_num] != AP_PERCHILD_THISCHILD) {
+        apr_socket_t *csd = NULL;
+
+        apr_os_sock_put(&csd, &thread_socket_table[thread_num], 
+                        r->connection->pool);
+        ap_sock_disable_nagle(csd);
+        ap_set_module_config(r->connection->conn_config, &core_module, csd);
+        return OK;
+    }
+    else {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, 
+                     "Determining if request should be passed. "
+                     "Child Num: %d, SD: %d, sd from table: %d, hostname from server: %s", child_num, 
+                     sconf->input, child_info_table[child_num].input, 
+                     r->server->server_hostname);
+        /* sconf is the server config for this vhost, so if our socket
+         * is not the same that was set in the config, then the request
+         * needs to be passed to another child. */
+        if (sconf->input != child_info_table[child_num].input) {
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, 
+                         "Passing request.");
+            if (pass_request(r) == -1) {
+                ap_log_error(APLOG_MARK, APLOG_ERR, 0,
+                             ap_server_conf, "Could not pass request to proper "
+                             "child, request will not be honored.");
+            }
+            longjmp(jmpbuffer, 1); 
+        }
+        return OK;
+    }
+    return OK;
+}
+
+static void perchild_hooks(apr_pool_t *p)
+{
+    /* The perchild 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};
+    one_process = 0;
+
+    ap_hook_open_logs(perchild_open_logs, NULL, aszSucc, APR_HOOK_MIDDLE);
+    ap_hook_pre_config(perchild_pre_config, NULL, NULL, APR_HOOK_MIDDLE); 
+    ap_hook_post_config(perchild_post_config, NULL, NULL, APR_HOOK_MIDDLE); 
+
+    /* Both of these must be run absolutely first.  If this request isn't for 
+     * this server then we need to forward it to the proper child.  No sense
+     * tying up this server running more post_read request hooks if it is
+     * just going to be forwarded along.  The process_connection hook allows
+     * perchild to receive the passed request correctly, by automatically
+     * filling in the core_input_filter's ctx pointer.
+     */
+    ap_hook_post_read_request(perchild_post_read, NULL, NULL,
+                              APR_HOOK_REALLY_FIRST);
+    ap_hook_process_connection(perchild_process_connection, NULL, NULL, 
+                               APR_HOOK_REALLY_FIRST);
+}
+
+static const char *set_num_daemons(cmd_parms *cmd, void *dummy,
+                                   const char *arg) 
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    num_daemons = atoi(arg);
+    if (num_daemons > server_limit) {
+       ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, 
+                    "WARNING: NumServers of %d exceeds ServerLimit value "
+                    "of %d servers,", num_daemons, server_limit);
+       ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, 
+                    " lowering NumServers to %d.  To increase, please "
+                    "see the", server_limit);
+       ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, 
+                    " ServerLimit directive.");
+       num_daemons = server_limit;
+    } 
+    else if (num_daemons < 1) {
+        ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, 
+                     "WARNING: Require NumServers > 0, setting to 1");
+        num_daemons = 1;
+    }
+    return NULL;
+}
+
+static const char *set_threads_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;
+    }
+
+    threads_to_start = atoi(arg);
+    if (threads_to_start > thread_limit) {
+        ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, 
+                     "WARNING: StartThreads of %d exceeds ThreadLimit value"
+                     " of %d threads,", threads_to_start,
+                     thread_limit);
+        ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, 
+                     " lowering StartThreads to %d. To increase, please"
+                     " see the", thread_limit);
+        ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, 
+                     " ThreadLimit directive.");
+    }
+    else if (threads_to_start < 1) {
+        ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, 
+                     "WARNING: Require StartThreads > 0, setting to 1");
+        threads_to_start = 1;
+    }
+    return NULL;
+}
+
+static const char *set_min_spare_threads(cmd_parms *cmd, void *dummy,
+                                         const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    min_spare_threads = atoi(arg);
+    if (min_spare_threads <= 0) {
+       ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, 
+                    "WARNING: detected MinSpareThreads 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.");
+       min_spare_threads = 1;
+    }
+       
+    return NULL;
+}
+
+static const char *set_max_spare_threads(cmd_parms *cmd, void *dummy,
+                                         const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    max_spare_threads = atoi(arg);
+    if (max_spare_threads >= thread_limit) {
+       ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, 
+                    "WARNING: detected MinSpareThreads set higher than");
+       ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, 
+                    "ThreadLimit. Resetting to %d", thread_limit);
+       max_spare_threads = thread_limit;
+    }
+    return NULL;
+}
+
+static const char *set_max_threads(cmd_parms *cmd, void *dummy, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    max_threads = atoi(arg);
+    if (max_threads > thread_limit) {
+       ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, 
+                    "WARNING: detected MaxThreadsPerChild set higher than");
+       ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, 
+                    "ThreadLimit. Resetting to %d", thread_limit);
+       max_threads = thread_limit;
+    }
+    return NULL;
+}
+
+static const char *set_child_per_uid(cmd_parms *cmd, void *dummy, const char *u,
+                                     const char *g, const char *num)
+{
+    int i;
+    int max_this_time = atoi(num) + curr_child_num;
+    
+
+    for (i = curr_child_num; i < max_this_time; i++, curr_child_num++) {
+        if (i > num_daemons) {
+            return "Trying to use more child ID's than NumServers.  Increase "
+                   "NumServers in your config file.";
+        }
+    
+        child_info_table[i].uid = ap_uname2id(u);
+        child_info_table[i].gid = ap_gname2id(g); 
+
+#ifndef BIG_SECURITY_HOLE
+        if (child_info_table[i].uid == 0 || child_info_table[i].gid == 0) {
+            return "Assigning root user/group to a child.";
+        }
+#endif
+    }
+    return NULL;
+}
+
+static const char *assign_childuid(cmd_parms *cmd, void *dummy, const char *uid,
+                                   const char *gid)
+{
+    int i;
+    int matching = 0;
+    int u = ap_uname2id(uid);
+    int g = ap_gname2id(gid);
+    const char *errstr;
+    int socks[2];
+    perchild_server_conf *sconf = (perchild_server_conf *)
+                            ap_get_module_config(cmd->server->module_config, 
+                                                 &mpm_perchild_module);
+
+    sconf->fullsockname = apr_pstrcat(cmd->pool, sconf->sockname, ".", uid,
+                                      ":", gid, NULL);
+
+    if ((errstr = make_perchild_socket(sconf->fullsockname, socks))) {
+        return errstr;
+    }
+
+    sconf->input = socks[0]; 
+    sconf->output = socks[1];
+
+    for (i = 0; i < num_daemons; i++) {
+        if (u == child_info_table[i].uid && g == child_info_table[i].gid) {
+            child_info_table[i].input = sconf->input;
+            child_info_table[i].output = sconf->output;
+            matching++;
+            ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, cmd->server, 
+                         "filling out child_info_table; UID: %d, GID: %d, "
+                         "SD: %d %d, OUTPUT: %d %d, Child Num: %d", 
+                         child_info_table[i].uid, child_info_table[i].gid, 
+                         sconf->input, child_info_table[i].input, sconf->output,
+                         child_info_table[i].output, i);
+        }
+    }
+
+    if (!matching) {
+        return "Unable to find process with matching uid/gid.";
+    }
+    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 *set_thread_limit (cmd_parms *cmd, void *dummy, const char *arg) 
+{
+    int tmp_thread_limit;
+    
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    tmp_thread_limit = atoi(arg);
+    /* you cannot change ThreadLimit across a restart; ignore
+     * any such attempts
+     */
+    if (first_thread_limit &&
+        tmp_thread_limit != thread_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;
+    }
+    thread_limit = tmp_thread_limit;
+    
+    if (thread_limit > MAX_THREAD_LIMIT) {
+       ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, 
+                    "WARNING: ThreadLimit of %d exceeds compile time limit "
+                    "of %d servers,", thread_limit, MAX_THREAD_LIMIT);
+       ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, 
+                    " lowering ThreadLimit to %d.", MAX_THREAD_LIMIT);
+       thread_limit = MAX_THREAD_LIMIT;
+    } 
+    else if (thread_limit < 1) {
+	ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, 
+                     "WARNING: Require ThreadLimit > 0, setting to 1");
+	thread_limit = 1;
+    }
+    return NULL;
+}
+
+static const command_rec perchild_cmds[] = {
+UNIX_DAEMON_COMMANDS,
+LISTEN_COMMANDS,
+AP_INIT_TAKE1("NumServers", set_num_daemons, NULL, RSRC_CONF,
+              "Number of children alive at the same time"),
+AP_INIT_TAKE1("StartThreads", set_threads_to_start, NULL, RSRC_CONF,
+              "Number of threads each child creates"),
+AP_INIT_TAKE1("MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF,
+              "Minimum number of idle threads per child, to handle "
+              "request spikes"),
+AP_INIT_TAKE1("MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF,
+              "Maximum number of idle threads per child"),
+AP_INIT_TAKE1("MaxThreadsPerChild", set_max_threads, NULL, RSRC_CONF,
+              "Maximum number of threads per child"),
+AP_INIT_TAKE3("ChildperUserID", set_child_per_uid, NULL, RSRC_CONF,
+              "Specify a User and Group for a specific child process."),
+AP_INIT_TAKE2("AssignUserID", assign_childuid, NULL, RSRC_CONF,
+              "Tie a virtual host to a specific child process."),
+AP_INIT_TAKE1("ServerLimit", set_server_limit, NULL, RSRC_CONF,
+              "Maximum value of NumServers for this run of Apache"),
+AP_INIT_TAKE1("ThreadLimit", set_thread_limit, NULL, RSRC_CONF,
+              "Maximum worker threads in a server for this run of Apache"),
+{ NULL }
+};
+
+static void *perchild_create_config(apr_pool_t *p, server_rec *s)
+{
+    perchild_server_conf *c = (perchild_server_conf *)
+                                  apr_pcalloc(p, sizeof(perchild_server_conf));
+
+    c->input = -1;
+    c->output = -1;
+    return c;
+}
+
+module AP_MODULE_DECLARE_DATA mpm_perchild_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 */
+    perchild_create_config,     /* create per-server config structure */
+    NULL,                       /* merge per-server config structures */
+    perchild_cmds,              /* command apr_table_t */
+    perchild_hooks              /* register_hooks */
+};
+