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diff --git a/modules/generators/mod_cgi.h b/modules/generators/mod_cgi.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  mod_cgi.h
+ * @brief CGI Script Execution Extension Module for Apache
+ *
+ * @defgroup MOD_CGI mod_cgi
+ * @ingroup APACHE_MODS
+ * @{
+ */
+
+#ifndef _MOD_CGI_H
+#define _MOD_CGI_H 1
+
+#include "mod_include.h"
+
+typedef enum {RUN_AS_SSI, RUN_AS_CGI} prog_types;
+
+typedef struct {
+    apr_int32_t          in_pipe;
+    apr_int32_t          out_pipe;
+    apr_int32_t          err_pipe;
+    int                  process_cgi;
+    apr_cmdtype_e        cmd_type;
+    apr_int32_t          detached;
+    prog_types           prog_type;
+    apr_bucket_brigade **bb;
+    include_ctx_t       *ctx;
+    ap_filter_t         *next;
+    apr_int32_t          addrspace;
+} cgi_exec_info_t;
+
+/**
+ * Registerable optional function to override CGI behavior;
+ * Reprocess the command and arguments to execute the given CGI script.
+ * @param cmd Pointer to the command to execute (may be overridden)
+ * @param argv Pointer to the arguments to pass (may be overridden)
+ * @param r The current request
+ * @param p The pool to allocate correct cmd/argv elements within.
+ * @param e_info pass e_info.cmd_type (Set to APR_SHELLCMD or APR_PROGRAM on entry)
+                      and e_info.detached (Should the child start in detached state?)
+ * @remark This callback may be registered by the os-specific module
+ * to correct the command and arguments for apr_proc_create invocation
+ * on a given os.  mod_cgi will call the function if registered.
+ */
+APR_DECLARE_OPTIONAL_FN(apr_status_t, ap_cgi_build_command,
+                        (const char **cmd, const char ***argv,
+                         request_rec *r, apr_pool_t *p,
+                         cgi_exec_info_t *e_info));
+
+#endif /* _MOD_CGI_H */
+/** @} */
+