On Sun, 14 Nov 2021 20:50:59 +0000 (UTC) bf wrote: > I've a shell script that processes several hundred xz-compressed text files > with a pipeline of the form: > > find . -depth -type f ... -print0 | \ > xargs -0tI @ xzcat -- @ | \ > iconv --byte-subst='�' --unicode-subst='�' --widechar-subst='�' -f MS-ANSI -t > UTF-8 -- | \ > grep ... \ > sed ... | \ > sort ... | \ > sort ... > > . Since updating to cygwin 3.3.x (but not on cygwin 3.2.x) the script > consistently fails when decompressing a portion of the files, resulting in > lost data, and error messages of the form: > > xzcat: (stdout): Write error: Bad address
Thanks for the report. I could reproduce your problem and found the cause. raw_read()/raw_write() in fhandler_pipe.cc seems to need handling of STATUS_PENDING in nonblocking mode. I also confirmed the following patch fixes the issue. However, I am not very sure that this is the right thing. Corinna, Ken, what do you think? From 2261c7d7df0173d2fb6755f6b9ccccf02b27015e Mon Sep 17 00:00:00 2001 From: Takashi Yano <takashi.y...@nifty.ne.jp> Date: Mon, 15 Nov 2021 12:30:53 +0900 Subject: [PATCH] Cygwin: pipe: Call CancelIo() if I/O is pending in nonblocking mode. - Currently, handling for STATUS_PENDING in raw_read()/raw_write() in nonblocking mode is missing. This patch fixes the issue. Addresses: https://cygwin.com/pipermail/cygwin/2021-November/249910.html --- winsup/cygwin/fhandler_pipe.cc | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/winsup/cygwin/fhandler_pipe.cc b/winsup/cygwin/fhandler_pipe.cc index 1ebf4de10..0de01befb 100644 --- a/winsup/cygwin/fhandler_pipe.cc +++ b/winsup/cygwin/fhandler_pipe.cc @@ -355,6 +355,9 @@ fhandler_pipe::raw_read (void *ptr, size_t& len) else status = io.Status; } + else if (status == STATUS_PENDING) + /* CancelIo() if STATUS_PENDING in nonblocking mode. */ + CancelIo (get_handle ()); if (isclosed ()) /* A signal handler might have closed the fd. */ { if (waitret == WAIT_OBJECT_0) @@ -538,6 +541,9 @@ fhandler_pipe_fifo::raw_write (const void *ptr, size_t len) else status = io.Status; } + else if (status == STATUS_PENDING) + /* CancelIo() if STATUS_PENDING in nonblocking mode. */ + CancelIo (get_handle ()); if (isclosed ()) /* A signal handler might have closed the fd. */ { if (waitret == WAIT_OBJECT_0) -- 2.33.0 -- Takashi Yano <takashi.y...@nifty.ne.jp> -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
