Viewing file:  pullpipe.py (1.24 KB) -rw-r--r--
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# -*- test-case-name: twisted.python.test.test_sendmsg -*-
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
import os
import socket
import sys
from struct import unpack
from typing import Tuple
from twisted.python.sendmsg import recvmsg
def recvfd(socketfd: int) -> Tuple[int, bytes]:
"""
Receive a file descriptor from a L{sendmsg} 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{bytes})
"""
ourSocket = socket.fromfd(socketfd, socket.AF_UNIX, socket.SOCK_STREAM)
data, ancillary, flags = recvmsg(ourSocket)
[(cmsgLevel, cmsgType, packedFD)] = ancillary
# cmsgLevel and cmsgType really need to be SOL_SOCKET / SCM_RIGHTS, but
# since those are the *only* standard values, there's not much point in
# checking.
[unpackedFD] = unpack("i", packedFD)
return (unpackedFD, data)
if __name__ == "__main__":
fd, description = recvfd(int(sys.argv[1]))
os.write(fd, b"Test fixture data: " + description + b".\n")
os.close(fd)
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