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<TITLE>sane-devel: Re: Problems with XSane and Mustek backend</TITLE>
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<META NAME="Author" CONTENT="Henning Meier-Geinitz (hmg-ml@gmx.de)">
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<META NAME="Subject" CONTENT="Re: Problems with XSane and Mustek backend">
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<H1>Re: Problems with XSane and Mustek backend</H1>
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<STRONG>From:</STRONG> Henning Meier-Geinitz (<A HREF="mailto:hmg-ml@gmx.de?Subject=Re:%20Problems%20with%20XSane%20and%20Mustek%20backend&In-Reply-To=<20000120003134.A4067@hmg1.vortex.robin.de>"><EM>hmg-ml@gmx.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Wed Jan 19 2000 - 15:31:34 PST
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0160.html">Petter Reinholdtsen: "Re: FW: RICOH FS2 SCANNER"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0158.html">Harald Bauer: "LHII-backend for SANE"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0127.html">Henning Meier-Geinitz: "Problems with XSane and Mustek backend"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0162.html">Oliver Rauch: "Re: Problems with XSane and Mustek backend"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0162.html">Oliver Rauch: "Re: Problems with XSane and Mustek backend"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0163.html">Oliver Rauch: "Re: Problems with XSane and Mustek backend"</A>
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<P>
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Replying to myself:
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<BR>
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<P>[About mustek backend and xsane/xscanimage hang]
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<BR>
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<P><EM>> I'm not very good at reading C source, so the following could be quite
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</EM><BR>
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<EM>> wrong: I looked into the source (mustek.c) and I think the problem is related
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</EM><BR>
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<EM>> to sane_read and especially sane_read returning SANE_STATUS_GOOD with a len
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</EM><BR>
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<EM>> of 0. That shouldn't happen in the blocking case (if I understand the SANE
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</EM><BR>
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<EM>> standard correctly) but it does.
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</EM><BR>
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<P>It doesn't. If I disable sane_set_io_mode (only blocking possible) I can
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<BR>
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scan without any problems. Only non blocking mode hangs.
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<BR>
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<P>I'm not sure if it's the fault of mustek.c or xsane (or mine). The sane
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<BR>
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standard says that the filedescriptor that is returned by sane_get_select_fd
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<BR>
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should be closed when the next sane_read would get eof. I think mustek.c
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<BR>
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does this correctly (the reader_process is closed). For non blocking mode
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<BR>
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xsane uses a gdk_input_add watching the file descriptor it got from
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<BR>
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sane_get_select_fd for readable data. If there is data it will start
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<BR>
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xsane_read_image_data (which does sane_read) until there is no more data.
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<BR>
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The next call to sane_read would result in eof so the filedescriptor is
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<BR>
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closed. But I couldn't find any code in xsane checking for the closed fd.
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<BR>
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--> deadlock. A simple change in xsane did it for me, I just added the
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<BR>
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GDK_INPUT_EXCEPTION to gdk_input_add so xsane_read_image_data is called on
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<BR>
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error conditions, too (xsane-preview.c and xsane-scan.c):
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<BR>
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<P>xsane.input_tag = gdk_input_add(fd, GDK_INPUT_READ|GDK_INPUT_EXCEPTION,
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<BR>
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xsane_read_image_data, 0);
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<BR>
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<P>Would this be a fix or a new bug? I haven't looked into xscanimage.
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<BR>
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<P>I really don't know why it works with kernel 2.0.
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<BR>
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<P>Ciao,
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<BR>
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Henning
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<BR>
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<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:%20Problems%20with%20XSane%20and%20Mustek%20backend&In-Reply-To=<20000120003134.A4067@hmg1.vortex.robin.de>">majordomo@mostang.com</A>
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</PRE>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0160.html">Petter Reinholdtsen: "Re: FW: RICOH FS2 SCANNER"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0158.html">Harald Bauer: "LHII-backend for SANE"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0127.html">Henning Meier-Geinitz: "Problems with XSane and Mustek backend"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0162.html">Oliver Rauch: "Re: Problems with XSane and Mustek backend"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0162.html">Oliver Rauch: "Re: Problems with XSane and Mustek backend"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0163.html">Oliver Rauch: "Re: Problems with XSane and Mustek backend"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Wed Jan 19 2000 - 15:27:57 PST</EM>
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