#!/usr/bin/env python

import time

usage = """Usage:

python unix-fd-service.py <file name> &

python unix-fd-client.py

"""

# Copyright (C) 2004-2006 Red Hat Inc. <http://www.redhat.com/>

# Copyright (C) 2005-2007 Collabora Ltd. <http://www.collabora.co.uk/>

# Copyright (C) 2010 Signove <http://www.signove.com>

#

# Permission is hereby granted, free of charge, to any person

# obtaining a copy of this software and associated documentation

# files (the "Software"), to deal in the Software without

# restriction, including without limitation the rights to use, copy,

# modify, merge, publish, distribute, sublicense, and/or sell copies

# of the Software, and to permit persons to whom the Software is

# furnished to do so, subject to the following conditions:

#

# The above copyright notice and this permission notice shall be

# included in all copies or substantial portions of the Software.

#

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,

# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

# DEALINGS IN THE SOFTWARE.

import sys

from traceback import print_exc

import os

import dbus

def main():

    bus = dbus.SessionBus()

    try:

        remote_object = bus.get_object("com.example.SampleService",

                                       "/SomeObject")

    except dbus.DBusException:

        print_exc()

        print usage

        sys.exit(1)

    iface = dbus.Interface(remote_object, "com.example.SampleInterface")

    # UnixFd is an opaque object that takes care of received fd

    fd_object = iface.GetFd()

    print fd_object

    # Once we take the fd number, we are in charge of closing it!

    fd = fd_object.take()

    print fd

    # We want to encapsulate the integer fd into a Python file or socket object

    f = os.fdopen(fd, "r")

    # If it were an UNIX socket we would do

    # sk = socket.fromfd(fd, socket.AF_UNIX, socket.SOCK_STREAM)

    # os.close(fd)

    #

    # fromfd() dup()s the descriptor so we need to close the original,

    # otherwise it 'leaks' (stays open until program exits).

    f.seek(0)

    print f.read()

if __name__ == '__main__':

    main()