/usr/lib/python2.7/dist-packages/twext/python/sendfd.py is in python-twext 0.1.b2.dev15059-1.
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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 | # -*- test-case-name: twext.python.test.test_sendmsg -*-
##
# Copyright (c) 2010-2015 Apple Inc. All rights reserved.
#
# Licensed 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.
##
from struct import pack, unpack, calcsize
from socket import SOL_SOCKET
from twisted.python.sendmsg import send1msg, recv1msg, SCM_RIGHTS
def sendfd(socketfd, fd, description):
"""
Send the given FD to another process via L{send1msg} on the given
C{AF_UNIX} socket.
@param socketfd: An C{AF_UNIX} socket, attached to another process waiting
to receive sockets via the ancillary data mechanism in L{send1msg}.
@type socketfd: C{int}
@param fd: A file descriptor to be sent to the other process.
@type fd: C{int}
@param description: a string describing the socket that was passed.
@type description: C{str}
"""
send1msg(
socketfd, description, 0, [(SOL_SOCKET, SCM_RIGHTS, pack("i", fd))]
)
def recvfd(socketfd):
"""
Receive a file descriptor from a L{send1msg} message on the given
C{AF_UNIX} socket.
@param socketfd: An C{AF_UNIX} socket, attached to another process waiting
to send sockets via the ancillary data mechanism in L{send1msg}.
@param fd: C{int}
@return: a 2-tuple of (new file descriptor, description).
@rtype: 2-tuple of (C{int}, C{str})
"""
data, _ignore_flags, ancillary = recv1msg(socketfd)
[(_ignore_cmsg_level, _ignore_cmsg_type, packedFD)] = ancillary
# cmsg_level and cmsg_type really need to be SOL_SOCKET / SCM_RIGHTS, but
# since those are the *only* standard values, there's not much point in
# checking.
unpackedFD = 0
int_size = calcsize("i")
if len(packedFD) > int_size: # [ar]happens on 64 bit arch (FreeBSD)
[unpackedFD] = unpack("i", packedFD[0:int_size])
else:
[unpackedFD] = unpack("i", packedFD)
return (unpackedFD, data)
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