Sophie: howto-html-en-20080722-2mdv2010.1 noarch

howto-html-en-20080722-2mdv2010.1.noarch.rpm

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
<HTML>
<HEAD>
 <META NAME="GENERATOR" CONTENT="SGML-Tools 1.0.9">
 <TITLE>The Linux SCSI programming HOWTO: Opening The Device</TITLE>
 <LINK HREF="SCSI-Programming-HOWTO-8.html" REL=next>
 <LINK HREF="SCSI-Programming-HOWTO-6.html" REL=previous>
 <LINK HREF="SCSI-Programming-HOWTO.html#toc7" REL=contents>
</HEAD>
<BODY>
<A HREF="SCSI-Programming-HOWTO-8.html">Next</A>
<A HREF="SCSI-Programming-HOWTO-6.html">Previous</A>
<A HREF="SCSI-Programming-HOWTO.html#toc7">Contents</A>
<HR>
<H2><A NAME="s7">7. Opening The Device</A></H2>

<P>A generic device has to be opened for read and write access:
<P>
<BLOCKQUOTE><CODE>
<PRE>
        int fd = open (device_name, O_RDWR);
</PRE>
</CODE></BLOCKQUOTE>
<P>(This is the case even for a read-only hardware device such as a cdrom
drive).
<P>We have to perform a <CODE>write</CODE> to send the command and a <CODE>read</CODE>
to get back any results. In the case of an error the return code is
negative (see section 
<A HREF="SCSI-Programming-HOWTO-21.html#sec-errorhandling">sec-errorhandling</A>
 for a complete list).
<P>
<HR>
<A HREF="SCSI-Programming-HOWTO-8.html">Next</A>
<A HREF="SCSI-Programming-HOWTO-6.html">Previous</A>
<A HREF="SCSI-Programming-HOWTO.html#toc7">Contents</A>
</BODY>
</HTML>