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Date:	Thu, 18 Sep 2003 10:49:18 -0400
From:	Christopher Faylor <cgf-rcm AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Tcl/Tk wish shell execution problem under bash
Message-ID:	<20030918144918.GC7208@redhat.com>
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References:	<LIEAKIKNANBLEKNLIAPGAEANCFAA DOT jeffry AT mail DOT utexas DOT edu> <Pine DOT GSO DOT 4 DOT 56 DOT 0309181040390 DOT 12411 AT slinky DOT cs DOT nyu DOT edu>
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On Thu, Sep 18, 2003 at 10:43:53AM -0400, Igor Pechtchanski wrote:
>On Thu, 18 Sep 2003, Jeff Russell wrote:
>
>> Igor Pechtchanski wrote:
>> >
>> > Can you reproduce the hang by running 'bash -c wish84'?  How about 'bash
>> > --login -i -c wish84'?  If so, the problem might be triggered by the
>> > presence of bash.
>> >
>> The following attempts produce the same hanging behavior:
>>   "bash -c /bin/wish84" from a DOS command shell and a bash (--login -i)
>> shell
>>   "bash --login -i -c /bin/wish84" from DOS shell nd a bash (--login -i)
>> shell
>> However,
>>   "strace -w /bin/wish84" (from a bash shell) works!  (Also confirmed by
>> Felix von Hove)
>>
>> I haven't tried the latest snapshot due to learning curve (in progress).
>>
>> JEff Russell
>
>This validates my WAG somewhat.  Does "strace -o wish.strace bash -c
>wish84" reproduce the hang?  The reason is that, IIRC, strace uses Windows
>exec mechanisms, rather than Cygwin's, so you need to force Cygwin's exec
>by running bash first.

Also try using a large buffer with strace:

strace -b 1000000 -o wish.strace bash -c wish84

since the large buffer sometimes helps unmask problems which were "fixed"
by the slowdown incurred by running strace.

cgf

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