HvsockConn shutdown bugfix, added .IsClosed() functions #231
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Is this change fixing some bug? Can you also add some more context on that please? |
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@ambarve I added more context, ptal |
dcantah
approved these changes
Feb 15, 2022
ambarve
reviewed
Feb 17, 2022
Corrected `HvsockConn` `CloseRead`/`Write` to check if the socket has been closed before attempting to shutdown the socket for reading or writing. Additionally, `shutdown` was not respecting whether to shutdown reading or writing, and only shutting down the socket for reading. Added `IsClosed` function to `win32File` (and therefore `win32Pipe` and `win32MessageBytePipe`) and `HvsockConn` to check if the socket/pipe has been closed already. Signed-off-by: Hamza El-Saawy <hamzaelsaawy@microsoft.com>
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The PR fixes bugs with
HvsockConnCloseRead/Writewhere shutdown is attempted on closed sockets, which returns a cryptic error:close hvsock [...]: shutdown: An operation was attempted on something that is not a socket, and where the(*HvsockConn).shutdownfunction was not respecting whether to close a socket for reading or writing, and only shutting down the pipe for reading.Currently,
(*Process).CloseStdinruns into two issues:syscall.Shutdownon a null socket handle. This PR preemptively returnsErrFileClosedto prevent that, and allow upstream callers to check for the situation where the socket is already closed.(*HvsockConn).CloseWritedoes not actually close the connection for writing, since(*HvsockConn).shutdownignores its parameter and closes the socket only for reading. This prevents hcsshim from usingCloseWrite(from within(*Process).CloseStdin) to stop the copy operation from upstream pipes into the processesstd in.This PR fixes those issues.
Additionally, two functions have been added:
(*HvsockConn).CloseReadWriteto expose shutting down both ends of the socket.(*win32File).IsClosed(and thereforewin32Pipeandwin32MessageBytePipe) and(*HvsockConn).IsClosedand to check if the socket/pipe has already been closed, since the structs already track internally if they have been closed or not.Signed-off-by: Hamza El-Saawy hamzaelsaawy@microsoft.com