Adding upstream version 2.4.57.upstream/2.4.57

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1783 insertions, 0 deletions

diff --git a/server/mpm/winnt/mpm_winnt.c b/server/mpm/winnt/mpm_winnt.c
new file mode 100644
index 0000000..1b8962e
--- /dev/null
+++ b/server/mpm/winnt/mpm_winnt.c
@@ -0,0 +1,1783 @@
+/* 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.
+ */
+
+#ifdef WIN32
+
+#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_connection.h"
+#include "apr_portable.h"
+#include "apr_thread_proc.h"
+#include "apr_getopt.h"
+#include "apr_strings.h"
+#include "apr_lib.h"
+#include "apr_shm.h"
+#include "apr_thread_mutex.h"
+#include "ap_mpm.h"
+#include "apr_general.h"
+#include "ap_config.h"
+#include "ap_listen.h"
+#include "mpm_default.h"
+#include "mpm_winnt.h"
+#include "mpm_common.h"
+#include <malloc.h>
+#include "apr_atomic.h"
+#include "scoreboard.h"
+
+#ifdef __WATCOMC__
+#define _environ environ
+#endif
+
+#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION /* missing on MinGW */
+#define STACK_SIZE_PARAM_IS_A_RESERVATION 0x00010000
+#endif
+
+/* Because ap_setup_listeners() is skipped in the child, any merging
+ * of [::]:80 and 0.0.0.0:80 for AP_ENABLE_V4_MAPPED in the parent
+ * won't have taken place in the child, so the child will expect to
+ * read two sockets for "Listen 80" but the parent will send only
+ * one.
+ */
+#ifdef AP_ENABLE_V4_MAPPED
+#error The WinNT MPM does not currently support AP_ENABLE_V4_MAPPED
+#endif
+
+/* scoreboard.c does the heavy lifting; all we do is create the child
+ * score by moving a handle down the pipe into the child's stdin.
+ */
+extern apr_shm_t *ap_scoreboard_shm;
+
+/* my_generation is returned to the scoreboard code */
+static volatile ap_generation_t my_generation=0;
+
+/* Definitions of WINNT MPM specific config globals */
+static HANDLE shutdown_event;  /* used to signal the parent to shutdown */
+static HANDLE restart_event;   /* used to signal the parent to restart */
+
+static int one_process = 0;
+static char const* signal_arg = NULL;
+
+OSVERSIONINFO osver; /* VER_PLATFORM_WIN32_NT */
+
+/* set by child_main to STACK_SIZE_PARAM_IS_A_RESERVATION for NT >= 5.1 (XP/2003) */
+DWORD stack_res_flag;
+
+static DWORD parent_pid;
+DWORD my_pid;
+
+/* used by parent to signal the child to start and exit */
+apr_proc_mutex_t *start_mutex;
+HANDLE exit_event;
+
+int ap_threads_per_child = 0;
+static int thread_limit = 0;
+static int first_thread_limit = 0;
+int winnt_mpm_state = AP_MPMQ_STARTING;
+
+/* shared by service.c as global, although
+ * perhaps it should be private.
+ */
+apr_pool_t *pconf;
+
+/* Only one of these, the pipe from our parent, meant only for
+ * one child worker's consumption (not to be inherited!)
+ * XXX: decorate this name for the trunk branch, was left simplified
+ *      only to make the 2.2 patch trivial to read.
+ */
+static HANDLE pipe;
+
+/*
+ * Command processors
+ */
+
+static const char *set_threads_per_child (cmd_parms *cmd, void *dummy, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    ap_threads_per_child = atoi(arg);
+    return NULL;
+}
+static const char *set_thread_limit (cmd_parms *cmd, void *dummy, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL) {
+        return err;
+    }
+
+    thread_limit = atoi(arg);
+    return NULL;
+}
+
+static const command_rec winnt_cmds[] = {
+LISTEN_COMMANDS,
+AP_INIT_TAKE1("ThreadsPerChild", set_threads_per_child, NULL, RSRC_CONF,
+  "Number of threads each child creates" ),
+AP_INIT_TAKE1("ThreadLimit", set_thread_limit, NULL, RSRC_CONF,
+  "Maximum worker threads in a server for this run of Apache"),
+{ NULL }
+};
+
+static void winnt_note_child_started(int slot, pid_t pid)
+{
+    ap_scoreboard_image->parent[slot].pid = pid;
+    ap_scoreboard_image->parent[slot].generation = my_generation;
+    ap_run_child_status(ap_server_conf,
+                        ap_scoreboard_image->parent[slot].pid,
+                        my_generation, slot, MPM_CHILD_STARTED);
+}
+
+static void winnt_note_child_killed(int slot)
+{
+    ap_run_child_status(ap_server_conf,
+                        ap_scoreboard_image->parent[slot].pid,
+                        ap_scoreboard_image->parent[slot].generation,
+                        slot, MPM_CHILD_EXITED);
+    ap_scoreboard_image->parent[slot].pid = 0;
+}
+
+/*
+ * Signalling Apache on NT.
+ *
+ * Under Unix, Apache can be told to shutdown or restart by sending various
+ * signals (HUP, USR, TERM). On NT we don't have easy access to signals, so
+ * we use "events" instead. The parent apache process goes into a loop
+ * where it waits forever for a set of events. Two of those events are
+ * called
+ *
+ *    apPID_shutdown
+ *    apPID_restart
+ *
+ * (where PID is the PID of the apache parent process). When one of these
+ * is signalled, the Apache parent performs the appropriate action. The events
+ * can become signalled through internal Apache methods (e.g. if the child
+ * finds a fatal error and needs to kill its parent), via the service
+ * control manager (the control thread will signal the shutdown event when
+ * requested to stop the Apache service), from the -k Apache command line,
+ * or from any external program which finds the Apache PID from the
+ * httpd.pid file.
+ *
+ * The signal_parent() function, below, is used to signal one of these events.
+ * It can be called by any child or parent process, since it does not
+ * rely on global variables.
+ *
+ * On entry, type gives the event to signal. 0 means shutdown, 1 means
+ * graceful restart.
+ */
+/*
+ * Initialise the signal names, in the global variables signal_name_prefix,
+ * signal_restart_name and signal_shutdown_name.
+ */
+#define MAX_SIGNAL_NAME 30  /* Long enough for apPID_shutdown, where PID is an int */
+static char signal_name_prefix[MAX_SIGNAL_NAME];
+static char signal_restart_name[MAX_SIGNAL_NAME];
+static char signal_shutdown_name[MAX_SIGNAL_NAME];
+static void setup_signal_names(char *prefix)
+{
+    apr_snprintf(signal_name_prefix, sizeof(signal_name_prefix), prefix);
+    apr_snprintf(signal_shutdown_name, sizeof(signal_shutdown_name),
+        "%s_shutdown", signal_name_prefix);
+    apr_snprintf(signal_restart_name, sizeof(signal_restart_name),
+        "%s_restart", signal_name_prefix);
+}
+
+AP_DECLARE(void) ap_signal_parent(ap_signal_parent_e type)
+{
+    HANDLE e;
+    char *signal_name;
+
+    if (parent_pid == my_pid) {
+        switch(type) {
+           case SIGNAL_PARENT_SHUTDOWN:
+           {
+               SetEvent(shutdown_event);
+               break;
+           }
+           /* This MPM supports only graceful restarts right now */
+           case SIGNAL_PARENT_RESTART:
+           case SIGNAL_PARENT_RESTART_GRACEFUL:
+           {
+               SetEvent(restart_event);
+               break;
+           }
+        }
+        return;
+    }
+
+    switch(type) {
+       case SIGNAL_PARENT_SHUTDOWN:
+       {
+           signal_name = signal_shutdown_name;
+           break;
+       }
+       /* This MPM supports only graceful restarts right now */
+       case SIGNAL_PARENT_RESTART:
+       case SIGNAL_PARENT_RESTART_GRACEFUL:
+       {
+           signal_name = signal_restart_name;
+           break;
+       }
+       default:
+           return;
+    }
+
+    e = OpenEvent(EVENT_MODIFY_STATE, FALSE, signal_name);
+    if (!e) {
+        /* Um, problem, can't signal the parent, which means we can't
+         * signal ourselves to die. Ignore for now...
+         */
+        ap_log_error(APLOG_MARK, APLOG_EMERG, apr_get_os_error(), ap_server_conf, APLOGNO(00382)
+                     "OpenEvent on %s event", signal_name);
+        return;
+    }
+    if (SetEvent(e) == 0) {
+        /* Same problem as above */
+        ap_log_error(APLOG_MARK, APLOG_EMERG, apr_get_os_error(), ap_server_conf, APLOGNO(00383)
+                     "SetEvent on %s event", signal_name);
+        CloseHandle(e);
+        return;
+    }
+    CloseHandle(e);
+}
+
+
+/*
+ * Passed the following handles [in sync with send_handles_to_child()]
+ *
+ *   ready event [signal the parent immediately, then close]
+ *   exit event  [save to poll later]
+ *   start mutex [signal from the parent to begin accept()]
+ *   scoreboard shm handle [to recreate the ap_scoreboard]
+ */
+static void get_handles_from_parent(server_rec *s, HANDLE *child_exit_event,
+                                    apr_proc_mutex_t **child_start_mutex,
+                                    apr_shm_t **scoreboard_shm)
+{
+    HANDLE hScore;
+    HANDLE ready_event;
+    HANDLE os_start;
+    DWORD BytesRead;
+    void *sb_shared;
+    apr_status_t rv;
+
+    /* *** We now do this way back in winnt_rewrite_args
+     * pipe = GetStdHandle(STD_INPUT_HANDLE);
+     */
+    if (!ReadFile(pipe, &ready_event, sizeof(HANDLE),
+                  &BytesRead, (LPOVERLAPPED) NULL)
+        || (BytesRead != sizeof(HANDLE))) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00384)
+                     "Child: Unable to retrieve the ready event from the parent");
+        exit(APEXIT_CHILDINIT);
+    }
+
+    SetEvent(ready_event);
+    CloseHandle(ready_event);
+
+    if (!ReadFile(pipe, child_exit_event, sizeof(HANDLE),
+                  &BytesRead, (LPOVERLAPPED) NULL)
+        || (BytesRead != sizeof(HANDLE))) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00385)
+                     "Child: Unable to retrieve the exit event from the parent");
+        exit(APEXIT_CHILDINIT);
+    }
+
+    if (!ReadFile(pipe, &os_start, sizeof(os_start),
+                  &BytesRead, (LPOVERLAPPED) NULL)
+        || (BytesRead != sizeof(os_start))) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00386)
+                     "Child: Unable to retrieve the start_mutex from the parent");
+        exit(APEXIT_CHILDINIT);
+    }
+    *child_start_mutex = NULL;
+    if ((rv = apr_os_proc_mutex_put(child_start_mutex, &os_start, s->process->pool))
+            != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00387)
+                     "Child: Unable to access the start_mutex from the parent");
+        exit(APEXIT_CHILDINIT);
+    }
+
+    if (!ReadFile(pipe, &hScore, sizeof(hScore),
+                  &BytesRead, (LPOVERLAPPED) NULL)
+        || (BytesRead != sizeof(hScore))) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00388)
+                     "Child: Unable to retrieve the scoreboard from the parent");
+        exit(APEXIT_CHILDINIT);
+    }
+    *scoreboard_shm = NULL;
+    if ((rv = apr_os_shm_put(scoreboard_shm, &hScore, s->process->pool))
+            != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00389)
+                     "Child: Unable to access the scoreboard from the parent");
+        exit(APEXIT_CHILDINIT);
+    }
+
+    rv = ap_reopen_scoreboard(s->process->pool, scoreboard_shm, 1);
+    if (rv || !(sb_shared = apr_shm_baseaddr_get(*scoreboard_shm))) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00390)
+                     "Child: Unable to reopen the scoreboard from the parent");
+        exit(APEXIT_CHILDINIT);
+    }
+    /* We must 'initialize' the scoreboard to relink all the
+     * process-local pointer arrays into the shared memory block.
+     */
+    ap_init_scoreboard(sb_shared);
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00391)
+                 "Child: Retrieved our scoreboard from the parent.");
+}
+
+
+static int send_handles_to_child(apr_pool_t *p,
+                                 HANDLE child_ready_event,
+                                 HANDLE child_exit_event,
+                                 apr_proc_mutex_t *child_start_mutex,
+                                 apr_shm_t *scoreboard_shm,
+                                 HANDLE hProcess,
+                                 apr_file_t *child_in)
+{
+    apr_status_t rv;
+    HANDLE hCurrentProcess = GetCurrentProcess();
+    HANDLE hDup;
+    HANDLE os_start;
+    HANDLE hScore;
+    apr_size_t BytesWritten;
+
+    if ((rv = apr_file_write_full(child_in, &my_generation,
+                                  sizeof(my_generation), NULL))
+            != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(02964)
+                     "Parent: Unable to send its generation to the child");
+        return -1;
+    }
+    if (!DuplicateHandle(hCurrentProcess, child_ready_event, hProcess, &hDup,
+        EVENT_MODIFY_STATE | SYNCHRONIZE, FALSE, 0)) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00392)
+                     "Parent: Unable to duplicate the ready event handle for the child");
+        return -1;
+    }
+    if ((rv = apr_file_write_full(child_in, &hDup, sizeof(hDup), &BytesWritten))
+            != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00393)
+                     "Parent: Unable to send the exit event handle to the child");
+        return -1;
+    }
+    if (!DuplicateHandle(hCurrentProcess, child_exit_event, hProcess, &hDup,
+                         EVENT_MODIFY_STATE | SYNCHRONIZE, FALSE, 0)) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00394)
+                     "Parent: Unable to duplicate the exit event handle for the child");
+        return -1;
+    }
+    if ((rv = apr_file_write_full(child_in, &hDup, sizeof(hDup), &BytesWritten))
+            != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00395)
+                     "Parent: Unable to send the exit event handle to the child");
+        return -1;
+    }
+    if ((rv = apr_os_proc_mutex_get(&os_start, child_start_mutex)) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00396)
+                     "Parent: Unable to retrieve the start mutex for the child");
+        return -1;
+    }
+    if (!DuplicateHandle(hCurrentProcess, os_start, hProcess, &hDup,
+                         SYNCHRONIZE, FALSE, 0)) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00397)
+                     "Parent: Unable to duplicate the start mutex to the child");
+        return -1;
+    }
+    if ((rv = apr_file_write_full(child_in, &hDup, sizeof(hDup), &BytesWritten))
+            != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00398)
+                     "Parent: Unable to send the start mutex to the child");
+        return -1;
+    }
+    if ((rv = apr_os_shm_get(&hScore, scoreboard_shm)) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00399)
+                     "Parent: Unable to retrieve the scoreboard handle for the child");
+        return -1;
+    }
+    if (!DuplicateHandle(hCurrentProcess, hScore, hProcess, &hDup,
+                         FILE_MAP_READ | FILE_MAP_WRITE, FALSE, 0)) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00400)
+                     "Parent: Unable to duplicate the scoreboard handle to the child");
+        return -1;
+    }
+    if ((rv = apr_file_write_full(child_in, &hDup, sizeof(hDup), &BytesWritten))
+            != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00401)
+                     "Parent: Unable to send the scoreboard handle to the child");
+        return -1;
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00402)
+                 "Parent: Sent the scoreboard to the child");
+    return 0;
+}
+
+
+/*
+ * get_listeners_from_parent()
+ * The listen sockets are opened in the parent. This function, which runs
+ * exclusively in the child process, receives them from the parent and
+ * makes them available in the child.
+ */
+static void get_listeners_from_parent(server_rec *s)
+{
+    WSAPROTOCOL_INFO WSAProtocolInfo;
+    ap_listen_rec *lr;
+    DWORD BytesRead;
+    int lcnt = 0;
+    SOCKET nsd;
+
+    /* Set up a default listener if necessary */
+    if (ap_listeners == NULL) {
+        ap_listen_rec *lr;
+        lr = apr_palloc(s->process->pool, sizeof(ap_listen_rec));
+        lr->sd = NULL;
+        lr->next = ap_listeners;
+        ap_listeners = lr;
+    }
+
+    /* Open the pipe to the parent process to receive the inherited socket
+     * data. The sockets have been set to listening in the parent process.
+     *
+     * *** We now do this way back in winnt_rewrite_args
+     * pipe = GetStdHandle(STD_INPUT_HANDLE);
+     */
+    for (lr = ap_listeners; lr; lr = lr->next, ++lcnt) {
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00403)
+                     "Child: Waiting for data for listening socket %pI",
+                     lr->bind_addr);
+        if (!ReadFile(pipe, &WSAProtocolInfo, sizeof(WSAPROTOCOL_INFO),
+                      &BytesRead, (LPOVERLAPPED) NULL)) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00404)
+                         "Child: Unable to read socket data from parent");
+            exit(APEXIT_CHILDINIT);
+        }
+
+        nsd = WSASocket(FROM_PROTOCOL_INFO, FROM_PROTOCOL_INFO, FROM_PROTOCOL_INFO,
+                        &WSAProtocolInfo, 0, 0);
+        if (nsd == INVALID_SOCKET) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_netos_error(), ap_server_conf, APLOGNO(00405)
+                         "Child: WSASocket failed to open the inherited socket");
+            exit(APEXIT_CHILDINIT);
+        }
+
+        if (!SetHandleInformation((HANDLE)nsd, HANDLE_FLAG_INHERIT, 0)) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_os_error(), ap_server_conf, APLOGNO(00406)
+                         "Child: SetHandleInformation failed");
+        }
+        apr_os_sock_put(&lr->sd, &nsd, s->process->pool);
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00407)
+                 "Child: retrieved %d listeners from parent", lcnt);
+}
+
+
+static int send_listeners_to_child(apr_pool_t *p, DWORD dwProcessId,
+                                   apr_file_t *child_in)
+{
+    apr_status_t rv;
+    int lcnt = 0;
+    ap_listen_rec *lr;
+    LPWSAPROTOCOL_INFO  lpWSAProtocolInfo;
+    apr_size_t BytesWritten;
+
+    /* Run the chain of open sockets. For each socket, duplicate it
+     * for the target process then send the WSAPROTOCOL_INFO
+     * (returned by dup socket) to the child.
+     */
+    for (lr = ap_listeners; lr; lr = lr->next, ++lcnt) {
+        apr_os_sock_t nsd;
+        lpWSAProtocolInfo = apr_pcalloc(p, sizeof(WSAPROTOCOL_INFO));
+        apr_os_sock_get(&nsd, lr->sd);
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ap_server_conf, APLOGNO(00408)
+                     "Parent: Duplicating socket %d (%pI) and sending it to child process %lu",
+                     nsd, lr->bind_addr, dwProcessId);
+        if (WSADuplicateSocket(nsd, dwProcessId,
+                               lpWSAProtocolInfo) == SOCKET_ERROR) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_netos_error(), ap_server_conf, APLOGNO(00409)
+                         "Parent: WSADuplicateSocket failed for socket %d. Check the FAQ.", nsd);
+            return -1;
+        }
+
+        if ((rv = apr_file_write_full(child_in, lpWSAProtocolInfo,
+                                      sizeof(WSAPROTOCOL_INFO), &BytesWritten))
+                != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00410)
+                         "Parent: Unable to write duplicated socket %d to the child.", nsd);
+            return -1;
+        }
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00411)
+                 "Parent: Sent %d listeners to child %lu", lcnt, dwProcessId);
+    return 0;
+}
+
+enum waitlist_e {
+    waitlist_ready = 0,
+    waitlist_term = 1
+};
+
+static int create_process(apr_pool_t *p, HANDLE *child_proc, HANDLE *child_exit_event,
+                          DWORD *child_pid)
+{
+    /* These NEVER change for the lifetime of this parent
+     */
+    static char **args = NULL;
+    static char pidbuf[28];
+
+    apr_status_t rv;
+    apr_pool_t *ptemp;
+    apr_procattr_t *attr;
+    apr_proc_t new_child;
+    HANDLE hExitEvent;
+    HANDLE waitlist[2];  /* see waitlist_e */
+    char *cmd;
+    char *cwd;
+    char **env;
+    int envc;
+
+    apr_pool_create_ex(&ptemp, p, NULL, NULL);
+    apr_pool_tag(ptemp, "create_process");
+
+    /* Build the command line. Should look something like this:
+     * C:/apache/bin/httpd.exe -f ap_server_confname
+     * First, get the path to the executable...
+     */
+    apr_procattr_create(&attr, ptemp);
+    apr_procattr_cmdtype_set(attr, APR_PROGRAM);
+    apr_procattr_detach_set(attr, 1);
+    if (((rv = apr_filepath_get(&cwd, 0, ptemp)) != APR_SUCCESS)
+           || ((rv = apr_procattr_dir_set(attr, cwd)) != APR_SUCCESS)) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00412)
+                     "Parent: Failed to get the current path");
+    }
+
+    if (!args) {
+        /* Build the args array, only once since it won't change
+         * for the lifetime of this parent process.
+         */
+        if ((rv = ap_os_proc_filepath(&cmd, ptemp))
+                != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT, ERROR_BAD_PATHNAME, ap_server_conf, APLOGNO(00413)
+                         "Parent: Failed to get full path of %s",
+                         ap_server_conf->process->argv[0]);
+            apr_pool_destroy(ptemp);
+            return -1;
+        }
+
+        args = ap_malloc((ap_server_conf->process->argc + 1) * sizeof (char*));
+        memcpy(args + 1, ap_server_conf->process->argv + 1,
+               (ap_server_conf->process->argc - 1) * sizeof (char*));
+        args[0] = ap_malloc(strlen(cmd) + 1);
+        strcpy(args[0], cmd);
+        args[ap_server_conf->process->argc] = NULL;
+    }
+    else {
+        cmd = args[0];
+    }
+
+    /* Create a pipe to send handles to the child */
+    if ((rv = apr_procattr_io_set(attr, APR_FULL_BLOCK,
+                                  APR_NO_PIPE, APR_NO_PIPE)) != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00414)
+                        "Parent: Unable to create child stdin pipe.");
+        apr_pool_destroy(ptemp);
+        return -1;
+    }
+
+    /* Create the child_ready_event */
+    waitlist[waitlist_ready] = CreateEvent(NULL, TRUE, FALSE, NULL);
+    if (!waitlist[waitlist_ready]) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00415)
+                     "Parent: Could not create ready event for child process");
+        apr_pool_destroy (ptemp);
+        return -1;
+    }
+
+    /* Create the child_exit_event */
+    hExitEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
+    if (!hExitEvent) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00416)
+                     "Parent: Could not create exit event for child process");
+        apr_pool_destroy(ptemp);
+        CloseHandle(waitlist[waitlist_ready]);
+        return -1;
+    }
+
+    /* Build the env array */
+    for (envc = 0; _environ[envc]; ++envc) {
+        ;
+    }
+    env = apr_palloc(ptemp, (envc + 2) * sizeof (char*));
+    memcpy(env, _environ, envc * sizeof (char*));
+    apr_snprintf(pidbuf, sizeof(pidbuf), "AP_PARENT_PID=%lu", parent_pid);
+    env[envc] = pidbuf;
+    env[envc + 1] = NULL;
+
+    rv = apr_proc_create(&new_child, cmd, (const char * const *)args,
+                         (const char * const *)env, attr, ptemp);
+    if (rv != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00417)
+                     "Parent: Failed to create the child process.");
+        apr_pool_destroy(ptemp);
+        CloseHandle(hExitEvent);
+        CloseHandle(waitlist[waitlist_ready]);
+        CloseHandle(new_child.hproc);
+        return -1;
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_NOTICE, APR_SUCCESS, ap_server_conf, APLOGNO(00418)
+                 "Parent: Created child process %d", new_child.pid);
+
+    if (send_handles_to_child(ptemp, waitlist[waitlist_ready], hExitEvent,
+                              start_mutex, ap_scoreboard_shm,
+                              new_child.hproc, new_child.in)) {
+        /*
+         * This error is fatal, mop up the child and move on
+         * We toggle the child's exit event to cause this child
+         * to quit even as it is attempting to start.
+         */
+        SetEvent(hExitEvent);
+        apr_pool_destroy(ptemp);
+        CloseHandle(hExitEvent);
+        CloseHandle(waitlist[waitlist_ready]);
+        CloseHandle(new_child.hproc);
+        return -1;
+    }
+
+    /* Important:
+     * Give the child process a chance to run before dup'ing the sockets.
+     * We have already set the listening sockets noninheritable, but if
+     * WSADuplicateSocket runs before the child process initializes
+     * the listeners will be inherited anyway.
+     */
+    waitlist[waitlist_term] = new_child.hproc;
+    rv = WaitForMultipleObjects(2, waitlist, FALSE, INFINITE);
+    CloseHandle(waitlist[waitlist_ready]);
+    if (rv != WAIT_OBJECT_0) {
+        /*
+         * Outch... that isn't a ready signal. It's dead, Jim!
+         */
+        SetEvent(hExitEvent);
+        apr_pool_destroy(ptemp);
+        CloseHandle(hExitEvent);
+        CloseHandle(new_child.hproc);
+        return -1;
+    }
+
+    if (send_listeners_to_child(ptemp, new_child.pid, new_child.in)) {
+        /*
+         * This error is fatal, mop up the child and move on
+         * We toggle the child's exit event to cause this child
+         * to quit even as it is attempting to start.
+         */
+        SetEvent(hExitEvent);
+        apr_pool_destroy(ptemp);
+        CloseHandle(hExitEvent);
+        CloseHandle(new_child.hproc);
+        return -1;
+    }
+
+    apr_file_close(new_child.in);
+
+    *child_exit_event = hExitEvent;
+    *child_proc = new_child.hproc;
+    *child_pid = new_child.pid;
+
+    return 0;
+}
+
+/***********************************************************************
+ * master_main()
+ * master_main() runs in the parent process.  It creates the child
+ * process which handles HTTP requests then waits on one of three
+ * events:
+ *
+ * restart_event
+ * -------------
+ * The restart event causes master_main to start a new child process and
+ * tells the old child process to exit (by setting the child_exit_event).
+ * The restart event is set as a result of one of the following:
+ * 1. An apache -k restart command on the command line
+ * 2. A command received from Windows service manager which gets
+ *    translated into an ap_signal_parent(SIGNAL_PARENT_RESTART)
+ *    call by code in service.c.
+ * 3. The child process calling ap_signal_parent(SIGNAL_PARENT_RESTART)
+ *    as a result of hitting MaxConnectionsPerChild.
+ *
+ * shutdown_event
+ * --------------
+ * The shutdown event causes master_main to tell the child process to
+ * exit and that the server is shutting down. The shutdown event is
+ * set as a result of one of the following:
+ * 1. An apache -k shutdown command on the command line
+ * 2. A command received from Windows service manager which gets
+ *    translated into an ap_signal_parent(SIGNAL_PARENT_SHUTDOWN)
+ *    call by code in service.c.
+ *
+ * child process handle
+ * --------------------
+ * The child process handle will be signaled if the child process
+ * exits for any reason. In a normal running server, the signaling
+ * of this event means that the child process has exited prematurely
+ * due to a seg fault or other irrecoverable error. For server
+ * robustness, master_main will restart the child process under this
+ * condition.
+ *
+ * master_main uses the child_exit_event to signal the child process
+ * to exit.
+ **********************************************************************/
+#define NUM_WAIT_HANDLES 3
+#define CHILD_HANDLE     0
+#define SHUTDOWN_HANDLE  1
+#define RESTART_HANDLE   2
+static int master_main(server_rec *s, HANDLE shutdown_event, HANDLE restart_event)
+{
+    int rv, cld;
+    int child_created;
+    int restart_pending;
+    int shutdown_pending;
+    HANDLE child_exit_event;
+    HANDLE event_handles[NUM_WAIT_HANDLES];
+    DWORD child_pid;
+
+    child_created = restart_pending = shutdown_pending = 0;
+
+    event_handles[SHUTDOWN_HANDLE] = shutdown_event;
+    event_handles[RESTART_HANDLE] = restart_event;
+
+    /* Create a single child process */
+    rv = create_process(pconf, &event_handles[CHILD_HANDLE],
+                        &child_exit_event, &child_pid);
+    if (rv < 0)
+    {
+        ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00419)
+                     "master_main: create child process failed. Exiting.");
+        shutdown_pending = 1;
+        goto die_now;
+    }
+
+    child_created = 1;
+
+    if (!strcasecmp(signal_arg, "runservice")) {
+        mpm_service_started();
+    }
+
+    /* Update the scoreboard. Note that there is only a single active
+     * child at once.
+     */
+    ap_scoreboard_image->parent[0].quiescing = 0;
+    winnt_note_child_started(/* slot */ 0, child_pid);
+
+    /* Wait for shutdown or restart events or for child death */
+    winnt_mpm_state = AP_MPMQ_RUNNING;
+    rv = WaitForMultipleObjects(NUM_WAIT_HANDLES, (HANDLE *) event_handles, FALSE, INFINITE);
+    cld = rv - WAIT_OBJECT_0;
+    if (rv == WAIT_FAILED) {
+        /* Something serious is wrong */
+        ap_log_error(APLOG_MARK,APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00420)
+                     "master_main: WaitForMultipleObjects WAIT_FAILED -- doing server shutdown");
+        shutdown_pending = 1;
+    }
+    else if (rv == WAIT_TIMEOUT) {
+        /* Hey, this cannot happen */
+        ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_os_error(), s, APLOGNO(00421)
+                     "master_main: WaitForMultipleObjects with INFINITE wait exited with WAIT_TIMEOUT");
+        shutdown_pending = 1;
+    }
+    else if (cld == SHUTDOWN_HANDLE) {
+        /* shutdown_event signalled */
+        shutdown_pending = 1;
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, APR_SUCCESS, s, APLOGNO(00422)
+                     "Parent: Received shutdown signal -- Shutting down the server.");
+        if (ResetEvent(shutdown_event) == 0) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_os_error(), s, APLOGNO(00423)
+                         "ResetEvent(shutdown_event)");
+        }
+    }
+    else if (cld == RESTART_HANDLE) {
+        /* Received a restart event. Prepare the restart_event to be reused
+         * then signal the child process to exit.
+         */
+        restart_pending = 1;
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, s, APLOGNO(00424)
+                     "Parent: Received restart signal -- Restarting the server.");
+        if (ResetEvent(restart_event) == 0) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_os_error(), s, APLOGNO(00425)
+                         "Parent: ResetEvent(restart_event) failed.");
+        }
+        if (SetEvent(child_exit_event) == 0) {
+            ap_log_error(APLOG_MARK, APLOG_ERR, apr_get_os_error(), s, APLOGNO(00426)
+                         "Parent: SetEvent for child process event %pp failed.",
+                         event_handles[CHILD_HANDLE]);
+        }
+        /* Don't wait to verify that the child process really exits,
+         * just move on with the restart.
+         */
+        CloseHandle(event_handles[CHILD_HANDLE]);
+        event_handles[CHILD_HANDLE] = NULL;
+    }
+    else {
+        /* The child process exited prematurely due to a fatal error. */
+        DWORD exitcode;
+        if (!GetExitCodeProcess(event_handles[CHILD_HANDLE], &exitcode)) {
+            /* HUH? We did exit, didn't we? */
+            exitcode = APEXIT_CHILDFATAL;
+        }
+        if (   exitcode == APEXIT_CHILDFATAL
+            || exitcode == APEXIT_CHILDINIT
+            || exitcode == APEXIT_INIT) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT, 0, ap_server_conf, APLOGNO(00427)
+                         "Parent: child process %lu exited with status %lu -- Aborting.",
+                         child_pid, exitcode);
+            shutdown_pending = 1;
+        }
+        else {
+            int i;
+            restart_pending = 1;
+            ap_log_error(APLOG_MARK, APLOG_NOTICE, APR_SUCCESS, ap_server_conf, APLOGNO(00428)
+                         "Parent: child process %lu exited with status %lu -- Restarting.",
+                         child_pid, exitcode);
+            for (i = 0; i < ap_threads_per_child; i++) {
+                ap_update_child_status_from_indexes(0, i, SERVER_DEAD, NULL);
+            }
+        }
+        CloseHandle(event_handles[CHILD_HANDLE]);
+        event_handles[CHILD_HANDLE] = NULL;
+    }
+
+    winnt_note_child_killed(/* slot */ 0);
+
+    if (restart_pending) {
+        ++my_generation;
+        ap_scoreboard_image->global->running_generation = my_generation;
+    }
+die_now:
+    if (shutdown_pending)
+    {
+        int timeout = 30000;  /* Timeout is milliseconds */
+        winnt_mpm_state = AP_MPMQ_STOPPING;
+
+        if (!child_created) {
+            return 0;  /* Tell the caller we do not want to restart */
+        }
+
+        /* This shutdown is only marginally graceful. We will give the
+         * child a bit of time to exit gracefully. If the time expires,
+         * the child will be wacked.
+         */
+        if (!strcasecmp(signal_arg, "runservice")) {
+            mpm_service_stopping();
+        }
+        /* Signal the child processes to exit */
+        if (SetEvent(child_exit_event) == 0) {
+                ap_log_error(APLOG_MARK,APLOG_ERR, apr_get_os_error(), ap_server_conf, APLOGNO(00429)
+                             "Parent: SetEvent for child process event %pp failed",
+                             event_handles[CHILD_HANDLE]);
+        }
+        if (event_handles[CHILD_HANDLE]) {
+            rv = WaitForSingleObject(event_handles[CHILD_HANDLE], timeout);
+            if (rv == WAIT_OBJECT_0) {
+                ap_log_error(APLOG_MARK,APLOG_NOTICE, APR_SUCCESS, ap_server_conf, APLOGNO(00430)
+                             "Parent: Child process %lu exited successfully.", child_pid);
+                CloseHandle(event_handles[CHILD_HANDLE]);
+                event_handles[CHILD_HANDLE] = NULL;
+            }
+            else {
+                ap_log_error(APLOG_MARK,APLOG_NOTICE, APR_SUCCESS, ap_server_conf, APLOGNO(00431)
+                             "Parent: Forcing termination of child process %lu",
+                             child_pid);
+                TerminateProcess(event_handles[CHILD_HANDLE], 1);
+                CloseHandle(event_handles[CHILD_HANDLE]);
+                event_handles[CHILD_HANDLE] = NULL;
+            }
+        }
+        CloseHandle(child_exit_event);
+        return 0;  /* Tell the caller we do not want to restart */
+    }
+    winnt_mpm_state = AP_MPMQ_STARTING;
+    CloseHandle(child_exit_event);
+    return 1;      /* Tell the caller we want a restart */
+}
+
+/* service_nt_main_fn needs to append the StartService() args
+ * outside of our call stack and thread as the service starts...
+ */
+apr_array_header_t *mpm_new_argv;
+
+/* Remember service_to_start failures to log and fail in pre_config.
+ * Remember inst_argc and inst_argv for installing or starting the
+ * service after we preflight the config.
+ */
+
+static int winnt_query(int query_code, int *result, apr_status_t *rv)
+{
+    *rv = APR_SUCCESS;
+    switch (query_code) {
+        case AP_MPMQ_MAX_DAEMON_USED:
+            *result = MAXIMUM_WAIT_OBJECTS;
+            break;
+        case AP_MPMQ_IS_THREADED:
+            *result = AP_MPMQ_STATIC;
+            break;
+        case AP_MPMQ_IS_FORKED:
+            *result = AP_MPMQ_NOT_SUPPORTED;
+            break;
+        case AP_MPMQ_HARD_LIMIT_DAEMONS:
+            *result = HARD_SERVER_LIMIT;
+            break;
+        case AP_MPMQ_HARD_LIMIT_THREADS:
+            *result = thread_limit;
+            break;
+        case AP_MPMQ_MAX_THREADS:
+            *result = ap_threads_per_child;
+            break;
+        case AP_MPMQ_MIN_SPARE_DAEMONS:
+            *result = 0;
+            break;
+        case AP_MPMQ_MIN_SPARE_THREADS:
+            *result = 0;
+            break;
+        case AP_MPMQ_MAX_SPARE_DAEMONS:
+            *result = 0;
+            break;
+        case AP_MPMQ_MAX_SPARE_THREADS:
+            *result = 0;
+            break;
+        case AP_MPMQ_MAX_REQUESTS_DAEMON:
+            *result = ap_max_requests_per_child;
+            break;
+        case AP_MPMQ_MAX_DAEMONS:
+            *result = 1;
+            break;
+        case AP_MPMQ_MPM_STATE:
+            *result = winnt_mpm_state;
+            break;
+        case AP_MPMQ_GENERATION:
+            *result = my_generation;
+            break;
+        default:
+            *rv = APR_ENOTIMPL;
+            break;
+    }
+    return OK;
+}
+
+static const char *winnt_get_name(void)
+{
+    return "WinNT";
+}
+
+#define SERVICE_UNSET (-1)
+static apr_status_t service_set = SERVICE_UNSET;
+static apr_status_t service_to_start_success;
+static int inst_argc;
+static const char * const *inst_argv;
+static const char *service_name = NULL;
+
+static void winnt_rewrite_args(process_rec *process)
+{
+    /* Handle the following SCM aspects in this phase:
+     *
+     *   -k runservice [transition in service context only]
+     *   -k install
+     *   -k config
+     *   -k uninstall
+     *   -k stop
+     *   -k shutdown (same as -k stop). Maintained for backward compatibility.
+     *
+     * We can't leave this phase until we know our identity
+     * and modify the command arguments appropriately.
+     *
+     * We do not care if the .conf file exists or is parsable when
+     * attempting to stop or uninstall a service.
+     */
+    apr_status_t rv;
+    char *def_server_root;
+    char *binpath;
+    char optbuf[3];
+    const char *opt_arg;
+    int fixed_args;
+    char *pid;
+    apr_getopt_t *opt;
+    int running_as_service = 1;
+    int errout = 0;
+    apr_file_t *nullfile;
+
+    pconf = process->pconf;
+
+    osver.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
+    GetVersionEx(&osver);
+
+    /* We wish this was *always* a reservation, but sadly it wasn't so and
+     * we couldn't break a hard limit prior to NT Kernel 5.1
+     */
+    if (osver.dwPlatformId == VER_PLATFORM_WIN32_NT
+        && ((osver.dwMajorVersion > 5)
+         || ((osver.dwMajorVersion == 5) && (osver.dwMinorVersion > 0)))) {
+        stack_res_flag = STACK_SIZE_PARAM_IS_A_RESERVATION;
+    }
+
+    /* AP_PARENT_PID is only valid in the child */
+    pid = getenv("AP_PARENT_PID");
+    if (pid)
+    {
+        HANDLE filehand;
+        HANDLE hproc = GetCurrentProcess();
+        DWORD BytesRead;
+
+        /* This is the child */
+        my_pid = GetCurrentProcessId();
+        parent_pid = (DWORD) atol(pid);
+
+        /* Prevent holding open the (nonexistent) console */
+        ap_real_exit_code = 0;
+
+        /* The parent gave us stdin, we need to remember this
+         * handle, and no longer inherit it at our children
+         * (we can't slurp it up now, we just aren't ready yet).
+         * The original handle is closed below, at apr_file_dup2()
+         */
+        pipe = GetStdHandle(STD_INPUT_HANDLE);
+        if (DuplicateHandle(hproc, pipe,
+                            hproc, &filehand, 0, FALSE,
+                            DUPLICATE_SAME_ACCESS)) {
+            pipe = filehand;
+        }
+
+        /* The parent gave us stdout of the NUL device,
+         * and expects us to suck up stdin of all of our
+         * shared handles and data from the parent.
+         * Don't infect child processes with our stdin
+         * handle, use another handle to NUL!
+         */
+        {
+            apr_file_t *infile, *outfile;
+            if ((apr_file_open_stdout(&outfile, process->pool) == APR_SUCCESS)
+             && (apr_file_open_stdin(&infile, process->pool) == APR_SUCCESS))
+                apr_file_dup2(infile, outfile, process->pool);
+        }
+
+        /* This child needs the existing stderr opened for logging,
+         * already
+         */
+
+        /* Read this child's generation number as soon as now,
+         * so that further hooks can query it.
+         */
+        if (!ReadFile(pipe, &my_generation, sizeof(my_generation),
+                      &BytesRead, (LPOVERLAPPED) NULL)
+                || (BytesRead != sizeof(my_generation))) {
+            ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), NULL, APLOGNO(02965)
+                         "Child: Unable to retrieve my generation from the parent");
+            exit(APEXIT_CHILDINIT);
+        }
+
+        /* The parent is responsible for providing the
+         * COMPLETE ARGUMENTS REQUIRED to the child.
+         *
+         * No further argument parsing is needed, but
+         * for good measure we will provide a simple
+         * signal string for later testing.
+         */
+        signal_arg = "runchild";
+        return;
+    }
+
+    /* This is the parent, we have a long way to go :-) */
+    parent_pid = my_pid = GetCurrentProcessId();
+
+    /* This behavior is voided by setting real_exit_code to 0 */
+    atexit(hold_console_open_on_error);
+
+    /* Rewrite process->argv[];
+     *
+     * strip out -k signal into signal_arg
+     * strip out -n servicename and set the names
+     * add default -d serverroot from the path of this executable
+     *
+     * The end result will look like:
+     *
+     * The invocation command (%0)
+     *     The -d serverroot default from the running executable
+     *         The requested service's (-n) registry ConfigArgs
+     *             The WinNT SCM's StartService() args
+     */
+    if ((rv = ap_os_proc_filepath(&binpath, process->pconf))
+            != APR_SUCCESS) {
+        ap_log_error(APLOG_MARK,APLOG_CRIT, rv, NULL, APLOGNO(00432)
+                     "Failed to get the full path of %s", process->argv[0]);
+        exit(APEXIT_INIT);
+    }
+    /* WARNING: There is an implicit assumption here that the
+     * executable resides in ServerRoot or ServerRoot\bin
+     */
+    def_server_root = (char *) apr_filepath_name_get(binpath);
+    if (def_server_root > binpath) {
+        *(def_server_root - 1) = '\0';
+        def_server_root = (char *) apr_filepath_name_get(binpath);
+        if (!strcasecmp(def_server_root, "bin"))
+            *(def_server_root - 1) = '\0';
+    }
+    apr_filepath_merge(&def_server_root, NULL, binpath,
+                       APR_FILEPATH_TRUENAME, process->pool);
+
+    /* Use process->pool so that the rewritten argv
+     * lasts for the lifetime of the server process,
+     * because pconf will be destroyed after the
+     * initial pre-flight of the config parser.
+     */
+    mpm_new_argv = apr_array_make(process->pool, process->argc + 2,
+                                  sizeof(const char *));
+    *(const char **)apr_array_push(mpm_new_argv) = process->argv[0];
+    *(const char **)apr_array_push(mpm_new_argv) = "-d";
+    *(const char **)apr_array_push(mpm_new_argv) = def_server_root;
+
+    fixed_args = mpm_new_argv->nelts;
+
+    optbuf[0] = '-';
+    optbuf[2] = '\0';
+    apr_getopt_init(&opt, process->pool, process->argc, process->argv);
+    opt->errfn = NULL;
+    while ((rv = apr_getopt(opt, "wn:k:" AP_SERVER_BASEARGS,
+                            optbuf + 1, &opt_arg)) == APR_SUCCESS) {
+        switch (optbuf[1]) {
+
+        /* Shortcuts; include the -w option to hold the window open on error.
+         * This must not be toggled once we reset ap_real_exit_code to 0!
+         */
+        case 'w':
+            if (ap_real_exit_code)
+                ap_real_exit_code = 2;
+            break;
+
+        case 'n':
+            service_set = mpm_service_set_name(process->pool, &service_name,
+                                               opt_arg);
+            break;
+
+        case 'k':
+            signal_arg = opt_arg;
+            break;
+
+        case 'E':
+            errout = 1;
+            /* Fall through so the Apache main() handles the 'E' arg */
+        default:
+            *(const char **)apr_array_push(mpm_new_argv) =
+                apr_pstrdup(process->pool, optbuf);
+
+            if (opt_arg) {
+                *(const char **)apr_array_push(mpm_new_argv) = opt_arg;
+            }
+            break;
+        }
+    }
+
+    /* back up to capture the bad argument */
+    if (rv == APR_BADCH || rv == APR_BADARG) {
+        opt->ind--;
+    }
+
+    while (opt->ind < opt->argc) {
+        *(const char **)apr_array_push(mpm_new_argv) =
+            apr_pstrdup(process->pool, opt->argv[opt->ind++]);
+    }
+
+    /* Track the number of args actually entered by the user */
+    inst_argc = mpm_new_argv->nelts - fixed_args;
+
+    /* Provide a default 'run' -k arg to simplify signal_arg tests */
+    if (!signal_arg)
+    {
+        signal_arg = "run";
+        running_as_service = 0;
+    }
+
+    if (!strcasecmp(signal_arg, "runservice"))
+    {
+        /* Start the NT Service _NOW_ because the WinNT SCM is
+         * expecting us to rapidly assume control of our own
+         * process, the SCM will tell us our service name, and
+         * may have extra StartService() command arguments to
+         * add for us.
+         *
+         * The SCM will generally invoke the executable with
+         * the c:\win\system32 default directory.  This is very
+         * lethal if folks use ServerRoot /foopath on windows
+         * without a drive letter.  Change to the default root
+         * (path to apache root, above /bin) for safety.
+         */
+        apr_filepath_set(def_server_root, process->pool);
+
+        /* Any other process has a console, so we don't to begin
+         * a Win9x service until the configuration is parsed and
+         * any command line errors are reported.
+         *
+         * We hold the return value so that we can die in pre_config
+         * after logging begins, and the failure can land in the log.
+         */
+        if (!errout) {
+            mpm_nt_eventlog_stderr_open(service_name, process->pool);
+        }
+        service_to_start_success = mpm_service_to_start(&service_name,
+                                                        process->pool);
+        if (service_to_start_success == APR_SUCCESS) {
+            service_set = APR_SUCCESS;
+        }
+
+        /* Open a null handle to soak stdout in this process.
+         * Windows service processes are missing any file handle
+         * usable for stdin/out/err.  This was the cause of later
+         * trouble with invocations of apr_file_open_stdout()
+         */
+        if ((rv = apr_file_open(&nullfile, "NUL",
+                                APR_READ | APR_WRITE, APR_OS_DEFAULT,
+                                process->pool)) == APR_SUCCESS) {
+            apr_file_t *nullstdout;
+            if (apr_file_open_stdout(&nullstdout, process->pool)
+                    == APR_SUCCESS)
+                apr_file_dup2(nullstdout, nullfile, process->pool);
+            apr_file_close(nullfile);
+        }
+    }
+
+    /* Get the default for any -k option, except run */
+    if (service_set == SERVICE_UNSET && strcasecmp(signal_arg, "run")) {
+        service_set = mpm_service_set_name(process->pool, &service_name,
+                                           AP_DEFAULT_SERVICE_NAME);
+    }
+
+    if (!strcasecmp(signal_arg, "install")) /* -k install */
+    {
+        if (service_set == APR_SUCCESS)
+        {
+            ap_log_error(APLOG_MARK,APLOG_ERR, 0, NULL, APLOGNO(00433)
+                 "%s: Service is already installed.", service_name);
+            exit(APEXIT_INIT);
+        }
+    }
+    else if (running_as_service)
+    {
+        if (service_set == APR_SUCCESS)
+        {
+            /* Attempt to Uninstall, or stop, before
+             * we can read the arguments or .conf files
+             */
+            if (!strcasecmp(signal_arg, "uninstall")) {
+                rv = mpm_service_uninstall();
+                exit(rv);
+            }
+
+            if ((!strcasecmp(signal_arg, "stop")) ||
+                (!strcasecmp(signal_arg, "shutdown"))) {
+                mpm_signal_service(process->pool, 0);
+                exit(0);
+            }
+
+            rv = mpm_merge_service_args(process->pool, mpm_new_argv,
+                                        fixed_args);
+            if (rv == APR_SUCCESS) {
+                ap_log_error(APLOG_MARK,APLOG_INFO, 0, NULL, APLOGNO(00434)
+                             "Using ConfigArgs of the installed service "
+                             "\"%s\".", service_name);
+            }
+            else  {
+                ap_log_error(APLOG_MARK,APLOG_WARNING, rv, NULL, APLOGNO(00435)
+                             "No installed ConfigArgs for the service "
+                             "\"%s\", using Apache defaults.", service_name);
+            }
+        }
+        else
+        {
+            ap_log_error(APLOG_MARK,APLOG_ERR, service_set, NULL, APLOGNO(00436)
+                 "No installed service named \"%s\".", service_name);
+            exit(APEXIT_INIT);
+        }
+    }
+    if (strcasecmp(signal_arg, "install") && service_set && service_set != SERVICE_UNSET)
+    {
+        ap_log_error(APLOG_MARK,APLOG_ERR, service_set, NULL, APLOGNO(00437)
+             "No installed service named \"%s\".", service_name);
+        exit(APEXIT_INIT);
+    }
+
+    /* Track the args actually entered by the user.
+     * These will be used for the -k install parameters, as well as
+     * for the -k start service override arguments.
+     */
+    inst_argv = (const char * const *)mpm_new_argv->elts
+        + mpm_new_argv->nelts - inst_argc;
+
+    /* Now, do service install or reconfigure then proceed to
+     * post_config to test the installed configuration.
+     */
+    if (!strcasecmp(signal_arg, "config")) { /* -k config */
+        /* Reconfigure the service */
+        rv = mpm_service_install(process->pool, inst_argc, inst_argv, 1);
+        if (rv != APR_SUCCESS) {
+            exit(rv);
+        }
+
+        fprintf(stderr,"Testing httpd.conf....\n");
+        fprintf(stderr,"Errors reported here must be corrected before the "
+                "service can be started.\n");
+    }
+    else if (!strcasecmp(signal_arg, "install")) { /* -k install */
+        /* Install the service */
+        rv = mpm_service_install(process->pool, inst_argc, inst_argv, 0);
+        if (rv != APR_SUCCESS) {
+            exit(rv);
+        }
+
+        fprintf(stderr,"Testing httpd.conf....\n");
+        fprintf(stderr,"Errors reported here must be corrected before the "
+                "service can be started.\n");
+    }
+
+    process->argc = mpm_new_argv->nelts;
+    process->argv = (const char * const *) mpm_new_argv->elts;
+}
+
+
+static int winnt_pre_config(apr_pool_t *pconf_, apr_pool_t *plog, apr_pool_t *ptemp)
+{
+    /* Handle the following SCM aspects in this phase:
+     *
+     *   -k runservice [WinNT errors logged from rewrite_args]
+     */
+
+    /* Initialize shared static objects.
+     * TODO: Put config related statics into an sconf structure.
+     */
+    pconf = pconf_;
+
+    if (ap_exists_config_define("ONE_PROCESS") ||
+        ap_exists_config_define("DEBUG"))
+        one_process = -1;
+
+    /* XXX: presume proper privileges; one nice thing would be
+     * a loud emit if running as "LocalSystem"/"SYSTEM" to indicate
+     * they should change to a user with write access to logs/ alone.
+     */
+    ap_sys_privileges_handlers(1);
+
+    if (!strcasecmp(signal_arg, "runservice")
+            && (service_to_start_success != APR_SUCCESS)) {
+        ap_log_error(APLOG_MARK,APLOG_CRIT, service_to_start_success, NULL, APLOGNO(00438)
+                     "%s: Unable to start the service manager.",
+                     service_name);
+        exit(APEXIT_INIT);
+    }
+    else if (ap_state_query(AP_SQ_RUN_MODE) == AP_SQ_RM_NORMAL
+             && !one_process && !my_generation) {
+        /* Open a null handle to soak stdout in this process.
+         * We need to emulate apr_proc_detach, unix performs this
+         * same check in the pre_config hook (although it is
+         * arguably premature).  Services already fixed this.
+         */
+        apr_file_t *nullfile;
+        apr_status_t rv;
+        apr_pool_t *pproc = apr_pool_parent_get(pconf);
+
+        if ((rv = apr_file_open(&nullfile, "NUL",
+                                APR_READ | APR_WRITE, APR_OS_DEFAULT,
+                                pproc)) == APR_SUCCESS) {
+            apr_file_t *nullstdout;
+            if (apr_file_open_stdout(&nullstdout, pproc)
+                    == APR_SUCCESS)
+                apr_file_dup2(nullstdout, nullfile, pproc);
+            apr_file_close(nullfile);
+        }
+    }
+
+    ap_listen_pre_config();
+    thread_limit = DEFAULT_THREAD_LIMIT;
+    ap_threads_per_child = DEFAULT_THREADS_PER_CHILD;
+
+    return OK;
+}
+
+static int winnt_check_config(apr_pool_t *pconf, apr_pool_t *plog,
+                              apr_pool_t *ptemp, server_rec* s)
+{
+    int is_parent;
+    int startup = 0;
+
+    /* We want this only in the parent and only the first time around */
+    is_parent = (parent_pid == my_pid);
+    if (is_parent &&
+        ap_state_query(AP_SQ_MAIN_STATE) == AP_SQ_MS_CREATE_PRE_CONFIG) {
+        startup = 1;
+    }
+
+    if (thread_limit > MAX_THREAD_LIMIT) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00439)
+                         "WARNING: ThreadLimit of %d exceeds compile-time "
+                         "limit of %d threads, decreasing to %d.",
+                         thread_limit, MAX_THREAD_LIMIT, MAX_THREAD_LIMIT);
+        } else if (is_parent) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00440)
+                         "ThreadLimit of %d exceeds compile-time limit "
+                         "of %d, decreasing to match",
+                         thread_limit, MAX_THREAD_LIMIT);
+        }
+        thread_limit = MAX_THREAD_LIMIT;
+    }
+    else if (thread_limit < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00441)
+                         "WARNING: ThreadLimit of %d not allowed, "
+                         "increasing to 1.", thread_limit);
+        } else if (is_parent) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00442)
+                         "ThreadLimit of %d not allowed, increasing to 1",
+                         thread_limit);
+        }
+        thread_limit = 1;
+    }
+
+    /* You cannot change ThreadLimit across a restart; ignore
+     * any such attempts.
+     */
+    if (!first_thread_limit) {
+        first_thread_limit = thread_limit;
+    }
+    else if (thread_limit != first_thread_limit) {
+        /* Don't need a startup console version here */
+        if (is_parent) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00443)
+                         "changing ThreadLimit to %d from original value "
+                         "of %d not allowed during restart",
+                         thread_limit, first_thread_limit);
+        }
+        thread_limit = first_thread_limit;
+    }
+
+    if (ap_threads_per_child > thread_limit) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00444)
+                         "WARNING: ThreadsPerChild of %d exceeds ThreadLimit "
+                         "of %d threads, decreasing to %d. To increase, please "
+                         "see the ThreadLimit directive.",
+                         ap_threads_per_child, thread_limit, thread_limit);
+        } else if (is_parent) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00445)
+                         "ThreadsPerChild of %d exceeds ThreadLimit "
+                         "of %d, decreasing to match",
+                         ap_threads_per_child, thread_limit);
+        }
+        ap_threads_per_child = thread_limit;
+    }
+    else if (ap_threads_per_child < 1) {
+        if (startup) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00446)
+                         "WARNING: ThreadsPerChild of %d not allowed, "
+                         "increasing to 1.", ap_threads_per_child);
+        } else if (is_parent) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00447)
+                         "ThreadsPerChild of %d not allowed, increasing to 1",
+                         ap_threads_per_child);
+        }
+        ap_threads_per_child = 1;
+    }
+
+    return OK;
+}
+
+static int winnt_post_config(apr_pool_t *pconf, apr_pool_t *plog, apr_pool_t *ptemp, server_rec* s)
+{
+    apr_status_t rv = 0;
+
+    /* Handle the following SCM aspects in this phase:
+     *
+     *   -k install (catch and exit as install was handled in rewrite_args)
+     *   -k config  (catch and exit as config was handled in rewrite_args)
+     *   -k start
+     *   -k restart
+     *   -k runservice [Win95, only once - after we parsed the config]
+     *
+     * because all of these signals are useful _only_ if there
+     * is a valid conf\httpd.conf environment to start.
+     *
+     * We reached this phase by avoiding errors that would cause
+     * these options to fail unexpectedly in another process.
+     */
+
+    if (!strcasecmp(signal_arg, "install")) {
+        /* Service install happens in the rewrite_args hooks. If we
+         * made it this far, the server configuration is clean and the
+         * service will successfully start.
+         */
+        apr_pool_destroy(s->process->pool);
+        apr_terminate();
+        exit(0);
+    }
+    if (!strcasecmp(signal_arg, "config")) {
+        /* Service reconfiguration happens in the rewrite_args hooks. If we
+         * made it this far, the server configuration is clean and the
+         * service will successfully start.
+         */
+        apr_pool_destroy(s->process->pool);
+        apr_terminate();
+        exit(0);
+    }
+
+    if (!strcasecmp(signal_arg, "start")) {
+        ap_listen_rec *lr;
+
+        /* Close the listening sockets. */
+        for (lr = ap_listeners; lr; lr = lr->next) {
+            apr_socket_close(lr->sd);
+            lr->active = 0;
+        }
+        rv = mpm_service_start(ptemp, inst_argc, inst_argv);
+        apr_pool_destroy(s->process->pool);
+        apr_terminate();
+        exit (rv);
+    }
+
+    if (!strcasecmp(signal_arg, "restart")) {
+        mpm_signal_service(ptemp, 1);
+        apr_pool_destroy(s->process->pool);
+        apr_terminate();
+        exit (rv);
+    }
+
+    if (parent_pid == my_pid)
+    {
+        if (ap_state_query(AP_SQ_MAIN_STATE) != AP_SQ_MS_CREATE_PRE_CONFIG
+            && ap_state_query(AP_SQ_CONFIG_GEN) == 1)
+        {
+            /* This code should be run once in the parent and not run
+             * across a restart
+             */
+            setup_signal_names(apr_psprintf(pconf, "ap%lu", parent_pid));
+
+            ap_log_pid(pconf, ap_pid_fname);
+
+            /* Create shutdown event, apPID_shutdown, where PID is the parent
+             * Apache process ID. Shutdown is signaled by 'apache -k shutdown'.
+             */
+            shutdown_event = CreateEvent(NULL, FALSE, FALSE, signal_shutdown_name);
+            if (!shutdown_event) {
+                ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00448)
+                             "Parent: Cannot create shutdown event %s", signal_shutdown_name);
+                return HTTP_INTERNAL_SERVER_ERROR;
+            }
+
+            /* Create restart event, apPID_restart, where PID is the parent
+             * Apache process ID. Restart is signaled by 'apache -k restart'.
+             */
+            restart_event = CreateEvent(NULL, FALSE, FALSE, signal_restart_name);
+            if (!restart_event) {
+                CloseHandle(shutdown_event);
+                ap_log_error(APLOG_MARK, APLOG_CRIT, apr_get_os_error(), ap_server_conf, APLOGNO(00449)
+                             "Parent: Cannot create restart event %s", signal_restart_name);
+                return HTTP_INTERNAL_SERVER_ERROR;
+            }
+
+            /* Create the start mutex, as an unnamed object for security.
+             * The start mutex is used during a restart to prevent more than
+             * one child process from entering the accept loop at once.
+             */
+            rv =  apr_proc_mutex_create(&start_mutex, NULL,
+                                        APR_LOCK_DEFAULT,
+                                        ap_server_conf->process->pool);
+            if (rv != APR_SUCCESS) {
+                ap_log_error(APLOG_MARK,APLOG_ERR, rv, ap_server_conf, APLOGNO(00450)
+                             "%s: Unable to create the start_mutex.",
+                             service_name);
+                return HTTP_INTERNAL_SERVER_ERROR;
+            }
+        }
+        /* Always reset our console handler to be the first, even on a restart
+        *  because some modules (e.g. mod_perl) might have set a console
+        *  handler to terminate the process.
+        */
+        if (strcasecmp(signal_arg, "runservice"))
+            mpm_start_console_handler();
+    }
+    else /* parent_pid != my_pid */
+    {
+        mpm_start_child_console_handler();
+    }
+    return OK;
+}
+
+/* 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 winnt_open_logs(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s)
+{
+    /* Initialize shared static objects.
+     */
+    if (parent_pid != my_pid) {
+        return OK;
+    }
+
+    /* We cannot initialize our listeners if we are restarting
+     * (the parent process already has glomed on to them)
+     * nor should we do so for service reconfiguration
+     * (since the service may already be running.)
+     */
+    if (!strcasecmp(signal_arg, "restart")
+            || !strcasecmp(signal_arg, "config")) {
+        return OK;
+    }
+
+    if (ap_setup_listeners(s) < 1) {
+        ap_log_error(APLOG_MARK, APLOG_ALERT|APLOG_STARTUP, 0,
+                     NULL, APLOGNO(00451) "no listening sockets available, shutting down");
+        return !OK;
+    }
+
+    return OK;
+}
+
+static void winnt_child_init(apr_pool_t *pchild, struct server_rec *s)
+{
+    apr_status_t rv;
+
+    setup_signal_names(apr_psprintf(pchild, "ap%lu", parent_pid));
+
+    /* This is a child process, not in single process mode */
+    if (!one_process) {
+        /* Set up events and the scoreboard */
+        get_handles_from_parent(s, &exit_event, &start_mutex,
+                                &ap_scoreboard_shm);
+
+        /* Set up the listeners */
+        get_listeners_from_parent(s);
+
+        /* Done reading from the parent, close that channel */
+        CloseHandle(pipe);
+    }
+    else {
+        /* Single process mode - this lock doesn't even need to exist */
+        rv = apr_proc_mutex_create(&start_mutex, signal_name_prefix,
+                                   APR_LOCK_DEFAULT, s->process->pool);
+        if (rv != APR_SUCCESS) {
+            ap_log_error(APLOG_MARK,APLOG_ERR, rv, ap_server_conf, APLOGNO(00452)
+                         "%s child: Unable to init the start_mutex.",
+                         service_name);
+            exit(APEXIT_CHILDINIT);
+        }
+
+        /* Borrow the shutdown_even as our _child_ loop exit event */
+        exit_event = shutdown_event;
+    }
+}
+
+
+static int winnt_run(apr_pool_t *_pconf, apr_pool_t *plog, server_rec *s )
+{
+    static int restart = 0;            /* Default is "not a restart" */
+
+    /* ### If non-graceful restarts are ever introduced - we need to rerun
+     * the pre_mpm hook on subsequent non-graceful restarts.  But Win32
+     * has only graceful style restarts - and we need this hook to act
+     * the same on Win32 as on Unix.
+     */
+    if (!restart && ((parent_pid == my_pid) || one_process)) {
+        /* Set up the scoreboard. */
+        if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
+            return !OK;
+        }
+    }
+
+    if ((parent_pid != my_pid) || one_process)
+    {
+        /* The child process or in one_process (debug) mode
+         */
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ap_server_conf, APLOGNO(00453)
+                     "Child process is running");
+
+        child_main(pconf, parent_pid);
+
+        ap_log_error(APLOG_MARK, APLOG_DEBUG, APR_SUCCESS, ap_server_conf, APLOGNO(00454)
+                     "Child process is exiting");
+        return DONE;
+    }
+    else
+    {
+        /* A real-honest to goodness parent */
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00455)
+                     "%s configured -- resuming normal operations",
+                     ap_get_server_description());
+        ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00456)
+                     "Server built: %s", ap_get_server_built());
+        ap_log_command_line(plog, s);
+        ap_log_mpm_common(s);
+
+        restart = master_main(ap_server_conf, shutdown_event, restart_event);
+
+        if (!restart)
+        {
+            /* Shutting down. Clean up... */
+            ap_remove_pid(pconf, ap_pid_fname);
+            apr_proc_mutex_destroy(start_mutex);
+
+            CloseHandle(restart_event);
+            CloseHandle(shutdown_event);
+
+            return DONE;
+        }
+    }
+
+    return OK; /* Restart */
+}
+
+static void winnt_hooks(apr_pool_t *p)
+{
+    /* Our open_logs hook function 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};
+
+    ap_hook_pre_config(winnt_pre_config, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_check_config(winnt_check_config, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_post_config(winnt_post_config, NULL, NULL, 0);
+    ap_hook_child_init(winnt_child_init, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_open_logs(winnt_open_logs, NULL, aszSucc, APR_HOOK_REALLY_FIRST);
+    ap_hook_mpm(winnt_run, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm_query(winnt_query, NULL, NULL, APR_HOOK_MIDDLE);
+    ap_hook_mpm_get_name(winnt_get_name, NULL, NULL, APR_HOOK_MIDDLE);
+}
+
+AP_DECLARE_MODULE(mpm_winnt) = {
+    MPM20_MODULE_STUFF,
+    winnt_rewrite_args,    /* hook to run before apache parses args */
+    NULL,                  /* create per-directory config structure */
+    NULL,                  /* merge per-directory config structures */
+    NULL,                  /* create per-server config structure */
+    NULL,                  /* merge per-server config structures */
+    winnt_cmds,            /* command apr_table_t */
+    winnt_hooks            /* register_hooks */
+};
+
+#endif /* def WIN32 */