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diff --git a/bin/confgen/include/confgen/os.h b/bin/confgen/include/confgen/os.h
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+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#pragma once
+
+#include <stdio.h>
+
+#include <isc/lang.h>
+
+ISC_LANG_BEGINDECLS
+
+int
+set_user(FILE *fd, const char *user);
+/*%<
+ * Set the owner of the file referenced by 'fd' to 'user'.
+ * Returns:
+ * 0 success
+ * -1 insufficient permissions, or 'user' does not exist.
+ */
+
+ISC_LANG_ENDDECLS