On Sat, Oct 16, 2010 at 1:41 PM, Mike Kaplinskiy mike.kaplinskiy@gmail.com wrote:
On Thu, Oct 14, 2010 at 10:08 PM, Erich Hoover ehoover@mines.edu wrote:
... DWORD flags; unsigned int n_iovecs; unsigned int first_iovec;
- WSABUF *control;
struct iovec iovec[1]; } ws2_async;
I would prefer control declared above n_iovecs purely for organizational purposes (params first, buffers and info about them last). Also you can't just store the passed in WSABUF pointer; it may be stack allocated and may disappear before the overlapped call completes. You could just add control and control_len instead of using WSABUF.
That's why in the original version I had those parameters split out; however, I realized that since the length parameter gets modified by WSARecvMsg that it is impossible for the WSAMSG structure (or any of its parameters) to disappear before WSARecvMsg completes. I have re-written the tests (see patch 4 at the end) to show that this structure gets modified even when an overlapped request is used and results in modification of the structure at a later time, the results from the test bot can be found here: https://testbot.winehq.org/JobDetails.pl?Key=6250
- /* Insufficient room for control headers */
- errno = EINVAL;
This should probably be ENOMEM then. On that note, it would be nice to test what windows actually does when you don't give it enough space (like 1 byte). We should probably rewrite that function at some point since I'm not sure what errno it returns anymore.
This is odd, I must have copy-pasted the wrong error code from the recvmsg() manual page. I've investigated this issue more and discovered that the code should actually be EMSGSIZE. This change and the corresponding tests can be found in my revised patches (at the end), I've also included support for reporting back the MSG_CTRUNC flag.
+#ifdef IP_PKTINFO
- case WS_IP_PKTINFO:
+#endif
You probably don't need the ifdef. convert_sockopt will just fail.
I did this to match how IP_HDRINCL was done nearby, should this really be changed?
- hdr.Control.buf = pktbuf;
.len = sizeof(pktbuf)?
The length parameter is declared within the loop, otherwise it gets resized (as mentioned earlier) when WSARecvMsg is called.
Thank you so much for all your help, I hope you find the following to be more to your liking.
[1/4] include: Add IP_PKTINFO response structure. http://www.compholio.com/wine-kane/patches/2010-10-17/0001-include-Add-IP_PK... [2/4] include: Add macros for retrieving control message headers. http://www.compholio.com/wine-kane/patches/2010-10-17/0002-include-Add-macro... [3/4] ws2_32: Add support for WSARecvMsg and IP_PKTINFO. http://www.compholio.com/wine-kane/patches/2010-10-17/0003-ws2_32-Add-suppor... [4/4] ws2_32/tests: Add regression tests for WSARecvMsg and IP_PKTINFO. http://www.compholio.com/wine-kane/patches/2010-10-17/0004-ws2_32-tests-Add-...
Erich Hoover ehoover@mines.edu