1.7.2: hangs with tcsh pipes

[Stefan Merten]

Hi!

Since recently I used some Cygwin 1.5 version. This worked very well.
Lately I switched to Cygwin 1.7.1 and ran into a problem described
below. I switched to Cygwin 1.7.2 hoping that my problem is solved but
unfortunately this is not the case.

Since the switch to Cygwin 1.7 I have a strange problem with my
`tcsh`. I'm using an extensive startup script which hangs
occasionally. I added `set echo` so I was able to identify the spots
where the occasional hangs occur.

I isolated the problem into the appended script. Sometimes it runs
fine and sometimes it hangs in one of the commands. You should be able
to run

  tcsh -f tcsh_problems.csh

My guess is that it has to do with the pipes used in the commands
executed. When a hang occurs one or more of the commands in the
pipeline are not shown to be executed. In any case I had this problem
only for commands which involved pipes. If I understood the release
notes correctly then pipe handling has been changed since 1.5.

I added the output of `cygcheck -svr`. I had to remove some
information for privacy reasons, however. Important information:

    Windows XP Professional Ver 5.1 Build 2600 Service Pack 3

    Cygwin DLL version info:
        DLL version: 1.7.2
        DLL epoch: 19
        DLL old termios: 5
        DLL malloc env: 28
        Cygwin conv: 181
        API major: 0
        API minor: 225
        Shared data: 5
        DLL identifier: cygwin1
        Mount registry: 3
        Cygwin registry name: Cygwin
        Program options name: Program Options
        Installations name: Installations
        Cygdrive default prefix: 
        Build date: Wed Mar 24 21:12:48 CET 2010
        Shared id: cygwin1S5

I'd be glad if you have a workaround for this problem. Otherwise I'd
be happy if I contributed a bug report in the hope of improving this
cool software further.

I'm not subscribed to the mailing list, so please Cc: me for replies.


Kind regards
Stefan

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