Pipes intermittently lose data on Cygwin 1.7.0-35 and -36. This bug
appears generic to pipes under Cygwin 1.7 and not limited to any
particular app.
To reproduce this bug, create a ~ 5 MB text file foo.
tr \32 \0 < foo | tr \0 \32 > bar
should make bar = foo. But intermittently, bar is truncated and missing
the end of foo. You can quickly tell by monitoring the file sizes:
intermittently bar is smaller than foo.
The bug appears generic to pipes under Cygwin 1.7, e.g.
sed s/\x1a/\x0/ foo | sed s/\x0/\x1a/ > bar
sort foo | tr \32 \0 > bar
cat foo | tr \32 \0 > bar
tac foo | tac > bar
cat foo | cat | cat > bar
all cause intermittent loss of data, where bar is sometimes truncated
and missing the end of foo (or beginning of foo in tac example). (The
last example contains 2 pipes, since cat foo | cat > bar appears more
resistant to this bug and only occasionally loses data.)
This bug is difficult to reproduce on my system when foo < ~ 3 MB. Hence
the recommendation above for foo ~ 5 MB.
This bug is present in Cygwin 1.7.0-35 and 1.7.0-36. I have not tested
earlier 1.7 builds.
This bug appears new to Cygwin 1.7 and not present in Cygwin 1.5.25-15.
Greetings,
Lawrence
Versions tested:
Cygwin 1.7.0-36 and 1.7.0-35 with coreutils 7.0-2 and sed 4.1.5-2
Cygwin 1.5.25-15 with coreutils 6.10-2 and sed 4.1.5-2
OS: Windows Server 2003 sp2 32-bit. Cygwin installed on NTFS drive C:.
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