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Message-ID: <3A79902B.AD837947@delcomsys.com>
Date: Thu, 01 Feb 2001 11:34:51 -0500
From: Patrick Doyle <wpd AT delcomsys DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: How to file descriptors get inherited by exec'd processes?
References: <3A798A49 DOT 608C6495 AT delcomsys DOT com> <20010201111227 DOT B9454 AT redhat DOT com>
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OK, thanks... Is it possible that, when a process is spawned by GDB, the
DLL thinks that it has been spawned from a non-cygwin process like a
windows command shell?  I ask because, as I step through dcrt0.cc, I
watch the call to 'stdio_init()', and can't see any calls to
'cygheap_fixup_in_child()'.

FWIW, I am running gdb from within NTEmacs, I issue "file test3" to load
the executable, "dll cygwin1" to load the DLL, and then set breakpoints
at specific lines in the source with, for example "break dcrt0.cc:123". 
I can set a breakpoint at the call to 'stdio_init()', but I never seem
to hit the breakpoint at 'cygheap_fixup_in_child()'.

Again, any pointers would be greatly appreciated.
--wpd


Christopher Faylor wrote:
> 
> On Thu, Feb 01, 2001 at 11:09:45AM -0500, Patrick Doyle wrote:
> >Could somebody please point me to the location in the source code where
> >file descriptors get inhereted by an exec'd process.  I see in
> >"dcrt0.cc" where 'stdio_init()' is called, which sets up the fdtab for
> >stdin, stdout, and stderr (only), but I can't seem to find where the
> >rest of the opened file descriptors are inherited.  I realize that this
> >is a bit off topic for this particular list, but I know the folks who
> >know the answer read this list.
> 
> They are inherited automatically in cygheap_fixup_in_child().
> 
> stdio_init() is only called when a cygwin process is invoked by a
> non-cygwin process like a Windows command shell.
> 
> cgf
> 
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