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diff --git a/os/unix/unixd.h b/os/unix/unixd.h
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+/* 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.
+ */
+
+/**
+ * @file  unixd.h
+ * @brief common stuff that unix MPMs will want
+ *
+ * @addtogroup APACHE_OS_UNIX
+ * @{
+ */
+
+#ifndef UNIXD_H
+#define UNIXD_H
+
+#include "httpd.h"
+#include "http_config.h"
+#include "scoreboard.h"
+#include "ap_listen.h"
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+#ifdef HAVE_SYS_RESOURCE_H
+#include <sys/resource.h>
+#endif
+#include "apr_hooks.h"
+#include "apr_thread_proc.h"
+#include "apr_proc_mutex.h"
+#include "apr_global_mutex.h"
+
+#include <pwd.h>
+#include <grp.h>
+#if APR_HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_IPC_H
+#include <sys/ipc.h>
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct {
+    uid_t uid;
+    gid_t gid;
+    int userdir;
+} ap_unix_identity_t;
+
+AP_DECLARE_HOOK(ap_unix_identity_t *, get_suexec_identity,(const request_rec *r))
+
+
+/* Default user name and group name. These may be specified as numbers by
+ * placing a # before a number */
+
+#ifndef DEFAULT_USER
+#define DEFAULT_USER "#-1"
+#endif
+#ifndef DEFAULT_GROUP
+#define DEFAULT_GROUP "#-1"
+#endif
+
+typedef struct {
+    const char *user_name;
+    const char *group_name;
+    uid_t user_id;
+    gid_t group_id;
+    int suexec_enabled;
+    const char *chroot_dir;
+    const char *suexec_disabled_reason; /* suitable msg if !suexec_enabled */
+} unixd_config_rec;
+AP_DECLARE_DATA extern unixd_config_rec ap_unixd_config;
+
+#if defined(RLIMIT_CPU) || defined(RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined(RLIMIT_NPROC) || defined(RLIMIT_AS)
+AP_DECLARE(void) ap_unixd_set_rlimit(cmd_parms *cmd, struct rlimit **plimit,
+                                     const char *arg,
+                                     const char * arg2, int type);
+#endif
+
+/**
+ * One of the functions to set mutex permissions should be called in
+ * the parent process on platforms that switch identity when the
+ * server is started as root.
+ * If the child init logic is performed before switching identity
+ * (e.g., MPM setup for an accept mutex), it should only be called
+ * for SysV semaphores.  Otherwise, it is safe to call it for all
+ * mutex types.
+ */
+AP_DECLARE(apr_status_t) ap_unixd_set_proc_mutex_perms(apr_proc_mutex_t *pmutex);
+AP_DECLARE(apr_status_t) ap_unixd_set_global_mutex_perms(apr_global_mutex_t *gmutex);
+AP_DECLARE(apr_status_t) ap_unixd_accept(void **accepted, ap_listen_rec *lr, apr_pool_t *ptrans);
+
+#ifdef HAVE_KILLPG
+#define ap_unixd_killpg(x, y)   (killpg ((x), (y)))
+#define ap_os_killpg(x, y)      (killpg ((x), (y)))
+#else /* HAVE_KILLPG */
+#define ap_unixd_killpg(x, y)   (kill (-(x), (y)))
+#define ap_os_killpg(x, y)      (kill (-(x), (y)))
+#endif /* HAVE_KILLPG */
+
+typedef struct {
+    void            *baton;  /* MPM's */
+
+    /* volatile because they're updated from signals' handlers */
+    int volatile    mpm_state;
+    int volatile    shutdown_pending;
+    int volatile    restart_pending;
+    int volatile    is_ungraceful;
+
+    ap_generation_t my_generation;
+    int             module_loads;
+    int             was_graceful;
+
+    /*
+     * Current number of listeners buckets and maximum reached across
+     * restarts (to size retained data according to dynamic num_buckets,
+     * eg. idle_spawn_rate).
+     */
+    int num_buckets, max_buckets;
+} ap_unixd_mpm_retained_data;
+
+AP_DECLARE(ap_unixd_mpm_retained_data *) ap_unixd_mpm_get_retained_data(void);
+AP_DECLARE(void) ap_unixd_mpm_set_signals(apr_pool_t *pconf, int once_process);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+/** @} */