Problem in executable file mechanism

[Igor Pechtchanski]

Try "strace sh -c ls".
	Igor

On Wed, 16 Apr 2003, lhall@pop.ma.ultranet.com wrote:

> OK, what are you seeing?  I get "bash: ls: command not found" with
> 1.3.20 and 1.3.22.
>
> Yes, strace can "change things" and I can see that it "fixes" this
> issue, so it's not much help in debugging it.  This is going to take
> some code viewing and possibly a stint with gdb.
>
> Larry
>
> Original Message:
> -----------------
> From:  luke.kendall@cisra.canon.com.au
> Date: Wed, 16 Apr 2003 13:23:32 +1000 (EST)
> To: cygwin@cygwin.com
> Subject: Re: Problem in executable file mechanism
>
>
> On 15 Apr, Larry Hall (RFK Partners, Inc.) wrote:
> >  Hm.  I tried a quick check here on 1.3.22 and couldn't reproduce this.
> >  Can you put together a small test that demonstrates this and/or provide
> >  the output from strace?
>
> Well, <long pause here> ... that was a lot harder than I expected!
>
> It turns out the problem *only* manifests if the executable and
> directory are in the same directory.  Sorry, I had convinced myself
> otherwise before.
>
> Here's how to reproduce:
>
> 	mkdir /usr/bin/ls
> 	hash -r
> 	ls
>
> It doesn't provide exactly the same symptom as the command I'd tested
> with before (where it just silently failed, with exit status 0).  I
> haven't been able to work out the difference.  It's not whether it's a
> Windows native one or not.
>
> Strangely, if you run the command with strace, the error can not be
> reproduced.  Does strace use a different piece of code to invoke its
> argument than the shell uses?
>
> >   Also, please take a look at
> >  <http://cygwin.com/problems.html>.
>
> Sorry.  Cygwin 1.3.15, Windows XP (and others); my cygcheck.out is
> attached.
>
> luke

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