[issue14300] dup_socket() on Windows should use WSA_FLAG_OVERLAPPED
Kristján Valur Jónsson krist...@ccpgames.com added the comment: I already included this fix in my socket share patch, see issue 14310. I think this was a bug that should be checked in to all relevant branches. The reason is this text from msdn documentation for WsaDuplicateSocket: Both the source process and the destination process should pass the same flags to their respective WSASocket function calls. If the source process uses the socket function to create the socket, the destination process _must_ [underline KVJ] pass the WSA_FLAG_OVERLAPPED flag to its WSASocket function call. See http://msdn.microsoft.com/en-us/library/windows/desktop/ms741565(v=vs.85).aspx -- nosy: +krisvale ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue14300 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue14300] dup_socket() on Windows should use WSA_FLAG_OVERLAPPED
Kristján Valur Jónsson krist...@ccpgames.com added the comment: Also, see this: http://support.microsoft.com/kb/179942/EN-US applies to windows 2000 only, as far as I can tell, though. Don't know if we still support that. I have scoured the docs, but found yet no reason to _not_ use this attribute. I wonder why it is optional at all. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue14300 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue14300] dup_socket() on Windows should use WSA_FLAG_OVERLAPPED
Roundup Robot devn...@psf.upfronthosting.co.za added the comment: New changeset 5be4d8fc9c44 by Antoine Pitrou in branch 'default': Issue #14300: Under Windows, sockets created using socket.dup() now allow overlapped I/O. http://hg.python.org/cpython/rev/5be4d8fc9c44 -- nosy: +python-dev ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue14300 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue14300] dup_socket() on Windows should use WSA_FLAG_OVERLAPPED
Antoine Pitrou pit...@free.fr added the comment: Ok, I've committed the patch to 3.3 since it can be useful with the new wait() method. Thanks! -- resolution: - fixed stage: - committed/rejected status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue14300 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue14300] dup_socket() on Windows should use WSA_FLAG_OVERLAPPED
New submission from sbt shibt...@gmail.com: According to Microsoft's documentation sockets created using socket() have the overlapped attribute, but sockets created with WSASocket() do not unless you pass the WSA_FLAG_OVERLAPPED flag. The documentation for WSADuplicateSocket() says If the source process uses the socket function to create the socket, the destination process must pass the WSA_FLAG_OVERLAPPED flag to its WSASocket function call. This means that dup_socket() in socketmodule.c should use return WSASocket(FROM_PROTOCOL_INFO, FROM_PROTOCOL_INFO, FROM_PROTOCOL_INFO, info, 0, WSA_FLAG_OVERLAPPED); instead of return WSASocket(FROM_PROTOCOL_INFO, FROM_PROTOCOL_INFO, FROM_PROTOCOL_INFO, info, 0, 0); (On Windows, the new multiprocessing.connection.wait() function depends on the overlapped attribute, although it is primarily intended for use with pipe connections not sockets.) Patch attached. -- files: socket_dup.patch keywords: patch messages: 155748 nosy: sbt priority: normal severity: normal status: open title: dup_socket() on Windows should use WSA_FLAG_OVERLAPPED versions: Python 3.3 Added file: http://bugs.python.org/file24841/socket_dup.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue14300 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue14300] dup_socket() on Windows should use WSA_FLAG_OVERLAPPED
Amaury Forgeot d'Arc amaur...@gmail.com added the comment: Which problem are you trying to solve? Can this change be tested somehow? -- nosy: +amaury.forgeotdarc ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue14300 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue14300] dup_socket() on Windows should use WSA_FLAG_OVERLAPPED
Antoine Pitrou pit...@free.fr added the comment: Are you sure this is desired? Nowhere can I think of a place in the stdlib where we use overlapped I/O on sockets. -- nosy: +pitrou ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue14300 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue14300] dup_socket() on Windows should use WSA_FLAG_OVERLAPPED
sbt shibt...@gmail.com added the comment: pitrou wrote: Are you sure this is desired? Nowhere can I think of a place in the stdlib where we use overlapped I/O on sockets. multiprocessing.connection.wait() does overlapped zero length reads on sockets. It's documentation currently claims that it works with sockets. Also it would seem strange if some sockets (created with socket()) have the overlapped attribute, but some others (created with WSASocket()) don't. amaury.forgeotdarc wrote: Which problem are you trying to solve? For one thing, the fact that socketmodule.c does not obey the word must in the quote from Microsoft's documentation. Can this change be tested somehow? An additional test could be added to test_multiprocessing.TestWait. Slightly surprisingly, in the testing I have done so far, using wait() with a duplicated socket seems to work without the patch. However, I would be rather wary of just assuming that it works in all cases and on all versions of Windows. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue14300 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
