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<TITLE>sane-devel: Re: OT: Is "fileno()" conform to ANSI or</TITLE>
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<META NAME="Author" CONTENT="Oliver Rauch (oliver.rauch@rauch-domain.de)">
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<META NAME="Subject" CONTENT="Re: OT: Is "fileno()" conform to ANSI or POSIX?">
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<H1>Re: OT: Is "fileno()" conform to ANSI or POSIX?</H1>
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<!-- received="Mon Mar 5 10:56:32 2001" -->
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<!-- sent="Mon, 05 Mar 2001 20:16:26 +0100" -->
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<!-- name="Oliver Rauch" -->
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<!-- subject="Re: OT: Is "fileno()" conform to ANSI or POSIX?" -->
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<!-- id="3AA3E60A.319277BC@rauch-domain.de" -->
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<!-- inreplyto="E14a0HM-0006o3-00@zoot" -->
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<STRONG>From:</STRONG> Oliver Rauch (<A HREF="mailto:oliver.rauch@rauch-domain.de?Subject=Re:%20OT:%20Is%20"fileno()"%20conform%20to%20ANSI%20or%20POSIX?&In-Reply-To=<3AA3E60A.319277BC@rauch-domain.de>"><EM>oliver.rauch@rauch-domain.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Mon Mar 05 2001 - 11:16:26 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0076.html">Frederik Ramm: "sane_get_parameters before sane_start"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0074.html">Dario Abatianni: "Snapscan e50 USB Question"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0073.html">Petter Reinholdtsen: "Re: OT: Is "fileno()" conform to ANSI or POSIX?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0080.html">Ulrich Deiters: "Re: OT: Is "fileno()" conform to ANSI or POSIX?"</A>
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<HR NOSHADE><P>
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<P>
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Petter Reinholdtsen wrote:
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<BR>
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<EM>>
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</EM><BR>
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<EM>> [Oliver Rauch]
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</EM><BR>
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<EM>> > By the way, does anyone know if mmap does anything else than
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</EM><BR>
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<EM>> > buffer=malloc(size) + fread(buffer, size, 1, file) ?
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > This way I would not depend on mmap and fileno.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Eh, yes. mmap() maps the file into the process address space, and
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</EM><BR>
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<EM>> allow you to access the file content without copying it from the
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</EM><BR>
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<EM>> kernel buffers into your own buffers. (ie the kernel buffers become
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</EM><BR>
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<EM>> part of the process address space.)
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> It is a lot faster than malloc() and fread().
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</EM><BR>
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<P>Hi Petter,
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<BR>
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<P>but if I understand that right this is releavant only
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<BR>
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for the mmap call, so if I call malloc and fread
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<BR>
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this is a bit slower than calling mmap, but accessing
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<BR>
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the buffer memory should not make any speed differences?!
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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.rauch-domain.de">http://www.rauch-domain.de</A>
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sane-umax: <A HREF="http://www.rauch-domain.de/sane-umax">http://www.rauch-domain.de/sane-umax</A>
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xsane: <A HREF="http://www.xsane.org">http://www.xsane.org</A>
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E-Mail: mailto:<A HREF="mailto:Oliver.Rauch@rauch-domain.de?Subject=Re:%20OT:%20Is%20"fileno()"%20conform%20to%20ANSI%20or%20POSIX?&In-Reply-To=<3AA3E60A.319277BC@rauch-domain.de>">Oliver.Rauch@rauch-domain.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:%20OT:%20Is%20"fileno()"%20conform%20to%20ANSI%20or%20POSIX?&In-Reply-To=<3AA3E60A.319277BC@rauch-domain.de>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0076.html">Frederik Ramm: "sane_get_parameters before sane_start"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0074.html">Dario Abatianni: "Snapscan e50 USB Question"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0073.html">Petter Reinholdtsen: "Re: OT: Is "fileno()" conform to ANSI or POSIX?"</A>
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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0080.html">Ulrich Deiters: "Re: OT: Is "fileno()" conform to ANSI or POSIX?"</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>Mon Mar 05 2001 - 10:56:43 PST</EM>
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