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Date: Thu, 6 Feb 2014 17:53:12 -0500
Message-ID: <CAEotdw=0=n_sBjgfuyWKvg9xce==0TqWYdxkrhEU2DXxeBBUwQ@mail.gmail.com>
Subject: Re: using spawn functions to avoid fork() errors
From: David Conrad <DavidConrad@acm.org>
To: cygwin@cygwin.com
Content-Type: text/plain; charset=ISO-8859-1

>>> On 2/6/2014 8:50 AM, Steven Bardwell wrote:
>>>> However, on my 64-bit install, the spawnv() call is returning with an
>>>> error -- 'No such file or  directory' -- when I try to spawn /bin/sh.

A few things come to mind as possibilities to check, or try. First,
there is a certain amount of magic that cygwin does to treat
/bin/sh.exe and /bin/sh the same. What happens if you spawn
/bin/sh.exe instead of /bin/sh? Second, what happens if you use
spawnvp instead of spawnv? Although, from the strace excerpt it
doesn't look like it's actually having trouble finding the executable,
so those probably aren't it. Still, worth checking, perhaps.

Third, are you certain you are NULL-terminating the array of
arguments? If you aren't doing so explicitly, it is possible there
happened to be a NULL pointer just after the arguments in memory for
the 32-bit version, so it happened to work, but that didn't happen for
the 64-bit version. The argv array must have a NULL at the end of it.
Fourth, what are you passing to the mode parameter of spawnv?

Or, fifth, I dunno what the problem is. Those are my only ideas. Good luck.

David

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