/usr/include/PackageKit/packagekit-glib2/pk-client-helper.h is in libpackagekit-glib2-dev 0.8.17-4ubuntu6~gcc5.4ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
 *
 * Copyright (C) 2010 Richard Hughes <richard@hughsie.com>
 *
 * Licensed under the GNU Lesser General Public License Version 2.1
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
 */
#if !defined (__PACKAGEKIT_H_INSIDE__) && !defined (PK_COMPILATION)
#error "Only <packagekit.h> can be included directly."
#endif
#ifndef __PK_CLIENT_HELPER_H
#define __PK_CLIENT_HELPER_H
#include <glib-object.h>
#include <packagekit-glib2/pk-source.h>
#include <packagekit-glib2/pk-enum.h>
G_BEGIN_DECLS
#define PK_TYPE_CLIENT_HELPER			(pk_client_helper_get_type ())
#define PK_CLIENT_HELPER(o)			(G_TYPE_CHECK_INSTANCE_CAST ((o), PK_TYPE_CLIENT_HELPER, PkClientHelper))
#define PK_CLIENT_HELPER_CLASS(k)		(G_TYPE_CHECK_CLASS_CAST((k), PK_TYPE_CLIENT_HELPER, PkClientHelperClass))
#define PK_IS_CLIENT_HELPER(o)			(G_TYPE_CHECK_INSTANCE_TYPE ((o), PK_TYPE_CLIENT_HELPER))
#define PK_IS_CLIENT_HELPER_CLASS(k)		(G_TYPE_CHECK_CLASS_TYPE ((k), PK_TYPE_CLIENT_HELPER))
#define PK_CLIENT_HELPER_GET_CLASS(o)		(G_TYPE_INSTANCE_GET_CLASS ((o), PK_TYPE_CLIENT_HELPER, PkClientHelperClass))
typedef struct _PkClientHelperPrivate	PkClientHelperPrivate;
typedef struct _PkClientHelper		PkClientHelper;
typedef struct _PkClientHelperClass	PkClientHelperClass;
struct _PkClientHelper
{
	 GObject		 parent;
	 PkClientHelperPrivate	*priv;
};
struct _PkClientHelperClass
{
	GObjectClass	parent_class;
	/* padding for future expansion */
	void (*_pk_reserved1) (void);
	void (*_pk_reserved2) (void);
	void (*_pk_reserved3) (void);
	void (*_pk_reserved4) (void);
	void (*_pk_reserved5) (void);
};
GType		 pk_client_helper_get_type		(void);
PkClientHelper	*pk_client_helper_new			(void);
gboolean	 pk_client_helper_stop			(PkClientHelper	*client_helper,
							 GError		**error);
gboolean	 pk_client_helper_start			(PkClientHelper	*client_helper,
							 const gchar	*socket_filename,
							 gchar		**argv,
							 gchar		**envp,
							 GError		**error);
G_END_DECLS
#endif /* __PK_CLIENT_HELPER_H */
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