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<TITLE>sane-devel: Re: seg-faults for network access</TITLE>
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<META NAME="Author" CONTENT="Jochen Eisinger (jochen.eisinger@gno.de)">
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<META NAME="Subject" CONTENT="Re: seg-faults for network access">
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<H1>Re: seg-faults for network access</H1>
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<!-- received="Sun Dec 10 05:35:00 2000" -->
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<!-- isoreceived="20001210133500" -->
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<!-- sent="Sun, 10 Dec 2000 14:36:48 +0100" -->
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<!-- isosent="20001210133648" -->
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<!-- name="Jochen Eisinger" -->
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<!-- email="jochen.eisinger@gno.de" -->
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<!-- subject="Re: seg-faults for network access" -->
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<!-- id="3A3386F0.1E7BD672@gno.de" -->
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<!-- inreplyto="20001209213618.C6330@lug.calpoly.edu" -->
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<STRONG>From:</STRONG> Jochen Eisinger (<A HREF="mailto:jochen.eisinger@gno.de?Subject=Re:%20seg-faults%20for%20network%20access&In-Reply-To=<3A3386F0.1E7BD672@gno.de>"><EM>jochen.eisinger@gno.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sun Dec 10 2000 - 05:36:48 PST
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0101.html">Jochen Eisinger: "Re: seg-faults for network access"</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0099.html">Marko Cebokli: "UMAX transparency adapter / averaging"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0091.html">Daniel Kerry Hiltgen: "seg-faults for network access"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0101.html">Jochen Eisinger: "Re: seg-faults for network access"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0101.html">Jochen Eisinger: "Re: seg-faults for network access"</A>
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<HR NOSHADE><P>
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<P>
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Hi!
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<BR>
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<P>[Daniel Kerry Hiltgen]
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<BR>
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<EM>> Does anyone know if saned and the network protocol is byte order clean,
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</EM><BR>
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<EM>> independent of the underlying architecture? (just a hunch...)
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</EM><BR>
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The protocol itself is byte order clean, but not the image date
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<BR>
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transfer...
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<BR>
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<P><EM>> I've got my scanner hooked up to a Sun Sparc (running linux), and I'm
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</EM><BR>
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<EM>> trying to access it from an x86 box. Local scans on the sparc seem to
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</EM><BR>
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<EM>> work, but it's headless/no X so I really want to use my desktop machine
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</EM><BR>
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<EM>> to do real scans.
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</EM><BR>
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Do local scans work or scans over localhost?
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<BR>
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<P>For debugging saned/net use the following:
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<BR>
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<P>Start saned from commandline as
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<BR>
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<P># export SANE_DEBUG_YOURBACKEND=128
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<BR>
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# saned -d128
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<BR>
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<P>and start scanimage on the other pc as
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<BR>
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<P>$ export SANE_DEBUG_NET=128
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<BR>
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$ scanimage -L
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<BR>
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<P>note that saned also produces output for syslog.
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<BR>
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<P>In your case, I think, saned isn't even accessed by the net backend...
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<BR>
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maybe your client has no access rights on the saned port on your sparc?
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<BR>
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<P><EM>> Here's one stack trace of the seg-fault. (I get roughly the same stack
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</EM><BR>
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<EM>> in scanimage -L, xsane, and xscanimage)
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</EM><BR>
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This is always the same... sanei_w_space can't read from the pipe and
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<BR>
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returns. The next call to sanei_w_space generates a sig11... I've
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<BR>
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attached a simple patch, maybe you get a better error-msg with this one.
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<BR>
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<P><EM>> Any thoughts? Can I provide more information that might be helpful in
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</EM><BR>
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<EM>> diagnosing the problem? (FWIW: Mustek 1200 LS)
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</EM><BR>
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<P>Could you please try this patch? and if it works (e.g. doesn't segfault
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<BR>
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anymore), please send the output from saned & scanimage... thanks
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<BR>
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<P>BTW. the patch was made against the current cvs tree but it should also
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<BR>
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work with SANE 1.0.3.
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<BR>
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<P>-- jochen
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<BR>
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<BR><P>
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--- ../sane/sane-backends/sanei/sanei_wire.c Sat Aug 12 17:11:37 2000
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<BR>
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+++ sane-backends/sanei/sanei_wire.c Sun Dec 10 12:38:19 2000
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<BR>
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@@ -56,6 +56,9 @@
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<BR>
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int fd = w->io.fd;
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<BR>
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ssize_t nread, nwritten;
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<BR>
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<BR>
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+ if (w->status != 0)
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<BR>
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+ return;
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<BR>
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+
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<BR>
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if (w->buffer.curr + howmuch > w->buffer.end)
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<BR>
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{
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<BR>
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switch (w->direction)
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<BR>
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@@ -80,6 +83,8 @@
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<BR>
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<BR>
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case WIRE_DECODE:
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<BR>
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left_over = w->buffer.end - w->buffer.curr;
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<BR>
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+ if ((signed) (left_over < 0))
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<BR>
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+ return;
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<BR>
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if (left_over)
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<BR>
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memcpy (w->buffer.start, w->buffer.curr, left_over);
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<BR>
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w->buffer.curr = w->buffer.start;
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<BR>
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<P><P><P><P><P><PRE>
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--
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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:%20seg-faults%20for%20network%20access&In-Reply-To=<3A3386F0.1E7BD672@gno.de>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0101.html">Jochen Eisinger: "Re: seg-faults for network access"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0099.html">Marko Cebokli: "UMAX transparency adapter / averaging"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0091.html">Daniel Kerry Hiltgen: "seg-faults for network access"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Sun Dec 10 2000 - 05:36:18 PST</EM>
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