[CalendarServer-dev] [Workaround] Re: Exception in recvfd --was: Re: continuing work on FreeBSD ports

Axel Rau Axel.Rau at chaos1.de
Fri Feb 22 04:20:23 PST 2013

Am 22.02.2013 um 10:58 schrieb Axel Rau:

> Unpacking to a long long instead an int seems to be a workaround:
Not really, because things like
converted to a long long breaks sendfdport etc.
Truncating to 4 bytes seems to work:
patch at the end of twext.python.sendfd.recvfd:
    unpackedFD = 0
    int_size = calcsize("i")
    log.debug(str('recvfd: socketfd=%d, data="%s", flags=0x%s, cmsg_level=0x%s, cmsg_type=0x%s, packedFD="0x%s"'
        % (socketfd, data, hex(long(flags)), hex(long(cmsg_level)), hex(long(cmsg_type)), packedFD.encode('hex_codec'))))
    if len(packedFD) != int_size:
        err_msg = str("recvfd: packedFD [%d] not %d bytes long" % (len(packedFD),int_size))
        if len(packedFD) > int_size:
            [unpackedFD] = unpack("i", packedFD[0:int_size])
            log.warn('recvfd: Truncating packedFD to %d bytes: %d.' % (int_size, unpackedFD))
            raise ValueError(err_msg)
        [unpackedFD] = unpack("i", packedFD)
    return (unpackedFD, data)
At least this shows to me, that shipping FDs via AF_UNIX sockets works.
To find the real bug, I need advice.

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