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Date: Tue, 27 Dec 2005 15:40:00 -0000
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From: Eli Zaretskii <eliz@gnu.org>
To: Mark Kettenis <mark.kettenis@xs4all.nl>
CC: msnyder@redhat.com, gdb-patches@sources.redhat.com, drow@false.org
In-reply-to: <200512261533.jBQFXCwt001363@elgar.sibelius.xs4all.nl> (message 	from Mark Kettenis on Mon, 26 Dec 2005 16:33:12 +0100 (CET))
Subject: Re: [RFA] Linux Checkpoints, take 3
Reply-to: Eli Zaretskii <eliz@gnu.org>
References: <43AC7D2E.6020609@redhat.com> <200512261533.jBQFXCwt001363@elgar.sibelius.xs4all.nl>
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> Date: Mon, 26 Dec 2005 16:33:12 +0100 (CET)
> From: Mark Kettenis <mark.kettenis@xs4all.nl>
> CC: gdb-patches@sources.redhat.com, drow@false.org
> 
> > +       /* Now save the 'state' (file position) of all open file descriptors.
> > + 	 Unfortunately fork does not take care of that for us...  */
> 
> Hmm, fork(2) clones it file descroptors but both file descriptors
> refer to the same open file description.  Nasty.  Wonder whether it'd
> be possible to copy the open file descriptorions too.

`fork' does the equivalent of `dup', AFAIK, so it cannot copy the
system file table entry to which those descriptors point.  If it did
copy the entries, redirection would stop working.