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<TITLE>sane-devel: Re: make dll.c robust against it being listed in it</TITLE>
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<META NAME="Author" CONTENT="Oliver Rauch (oliver.rauch@Wolfsburg.DE)">
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<META NAME="Subject" CONTENT="Re: make dll.c robust against it being listed in its configuration file...">
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<H1>Re: make dll.c robust against it being listed in its configuration file...</H1>
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<!-- received="Fri Oct 20 07:11:42 2000" -->
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<!-- name="Oliver Rauch" -->
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<!-- subject="Re: make dll.c robust against it being listed in its configuration file..." -->
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<STRONG>From:</STRONG> Oliver Rauch (<A HREF="mailto:oliver.rauch@Wolfsburg.DE?Subject=Re:%20make%20dll.c%20robust%20against%20it%20being%20listed%20in%20its%20configuration%20%20file...&In-Reply-To=<39F0482B.5ECCC239@wolfsburg.de>"><EM>oliver.rauch@Wolfsburg.DE</EM></A>)<BR>
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<STRONG>Date:</STRONG> Fri Oct 20 2000 - 06:27:07 PDT
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<LI><STRONG>Next message:</STRONG> <A HREF="0230.html">Oliver Rauch: "Re: sane fronten packages"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0228.html">Steve Underwood: "Re: Problems with Acer ScanPrisa 640S"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0225.html">Jochen Eisinger: "Re: make dll.c robust against it being listed in its configuration file..."</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0234.html">Jochen Eisinger: "Re: make dll.c robust against it being listed in its configuration file..."</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0234.html">Jochen Eisinger: "Re: make dll.c robust against it being listed in its configuration file..."</A>
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<P>
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Jochen Eisinger wrote:
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<BR>
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<EM>>
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</EM><BR>
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<EM>> Hi!
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> [Petter Reinholdtsen]
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > [Jochen Eisinger]
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</EM><BR>
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<EM>> > > What about just checking the backend name against "dll" while
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</EM><BR>
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<EM>> > > reading the dll.conf? This avoids that dll segfaults if dll is
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</EM><BR>
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<EM>> > > listed in the dll.conf.
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > Why do dll segfault? Shouldn't this be fixed first?
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</EM><BR>
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<EM>> Because the dll - backend is loaded recursivly about 100.000 times...
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</EM><BR>
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<EM>> actually dll doesn't segfault, but sooner or later one of the backends
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</EM><BR>
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<EM>> segfaults when allocating new memory.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> > I have not tested the patch, but it looks OK to me. I only suspect it
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</EM><BR>
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<EM>> > might be the wrong fix. :-)
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</EM><BR>
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<EM>> Ok, might be... I've another fix: instead of linking libsane.* to
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</EM><BR>
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<EM>> sane/libsane-dll.* we could copy libsane-dll.* to libsane.* and remove
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</EM><BR>
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<EM>> the dll-backend from the lib/sane/ directory. This way, the dll-backend
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</EM><BR>
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<EM>> can't load itself (because it isn't present as a backend)
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> what about this?
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</EM><BR>
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<EM>>
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</EM><BR>
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Hi Jochen,
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<BR>
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<P>I think the right way is to look for "dll" in dll.conf and ignore it.
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<BR>
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<P>There is a good reason for the links form libsane.so to sane/libsane-dll.so:
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<BR>
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All sane libraries can be used directly. You can link from
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<BR>
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sane/libsane-mustek.so to libsane.so and the mustek backend is loaded directly.
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<BR>
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<P>If someone adds dll to dll.conf it is his fault, if I program a recursive loop
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<BR>
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that allocates memory I also get in trouble. So checking for dll in dll.conf
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<BR>
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is the correct way. dll should print a warning when it finds "dll" in dll.conf
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<BR>
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and ignore that.
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<BR>
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<P>Bye
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<BR>
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Oliver
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<BR>
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<P><PRE>
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--
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Homepage: <A HREF="http://www.wolfsburg.de/~rauch">http://www.wolfsburg.de/~rauch</A>
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sane-umax: <A HREF="http://www.wolfsburg.de/~rauch/sane/sane-umax.html">http://www.wolfsburg.de/~rauch/sane/sane-umax.html</A>
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xsane: <A HREF="http://www.wolfsburg.de/~rauch/sane/sane-xsane.html">http://www.wolfsburg.de/~rauch/sane/sane-xsane.html</A>
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E-Mail: mailto:<A HREF="mailto:Oliver.Rauch@Wolfsburg.DE?Subject=Re:%20make%20dll.c%20robust%20against%20it%20being%20listed%20in%20its%20configuration%20%20file...&In-Reply-To=<39F0482B.5ECCC239@wolfsburg.de>">Oliver.Rauch@Wolfsburg.DE</A>
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<P>--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20make%20dll.c%20robust%20against%20it%20being%20listed%20in%20its%20configuration%20%20file...&In-Reply-To=<39F0482B.5ECCC239@wolfsburg.de>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0225.html">Jochen Eisinger: "Re: make dll.c robust against it being listed in its configuration file..."</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0234.html">Jochen Eisinger: "Re: make dll.c robust against it being listed in its configuration file..."</A>
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: <EM>Fri Oct 20 2000 - 07:15:28 PDT</EM>
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