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<H2><A ID="SECTION000217000000000000000">
Options</A>
</H2>
<P>
<TT>A final flag register controls the <EM>behavior</EM> of the CD<SMALL>ROM</SMALL> drives, in order to satisfy different users' wishes, hopefully
independently of the ideas of the respective author who happened to
have made the drive's support available to the L<SMALL>INUX</SMALL> community. The
current behavior options are:
</TT><P><!– MATH

$#$ & $/*$ #$*/$
CDOAUTOCLOSE &
trytoclosetrayupondevice$
open()$
CDOAUTOEJECT &
trytoopentrayonlastdevice$
close()$
CDOUSEFFLAGS &
use$
filepointer→
fflags$
toindicatepurposefor$
open()$
CDOLOCK &
trytolockdoorifdeviceisopened
CDOCHECKTYPE &
ensuredisctypeisdataifopenedfordata
–>
</P>
<DIV ALIGN="CENTER">
<IMG
STYLE="" SRC="img1.png"
ALT="
"># & /*#*/<IMG
STYLE="" SRC="img2.png"
ALT="
"><I>CDO</I><SUB>A</SUB><I>UTO</I><SUB>C</SUB><I>LOSE</I> & <I>trytoclosetrayupondevice</I>
< I > open < /I > ()<IMG
STYLE="" SRC="img2.png"
ALT="
"><I>CDO</I><SUB>A</SUB><I>UTO</I><SUB>E</SUB><I>JECT</I> & <I>trytoopentrayonlastdevice</I>
< I > close < /I > ()<IMG
STYLE="" SRC="img2.png"
ALT="
"><I>CDO</I><SUB>U</SUB><I>SE</I><SUB>F</SUB><I>FLAGS</I> & <I>use</I>
< I > file < /I > < SUB > p < /SUB > < I > ointer < /I > & #8594; < I > f < /I > < SUB > f < /SUB > < I > lags < /I ><I>toindicatepurposefor</I>
< I > open < /I > ()<IMG
STYLE="" SRC="img2.png"
ALT="
"><I>CDO</I><SUB>L</SUB><I>OCK</I> & <I>trytolockdoorifdeviceisopened</I><IMG
STYLE="" SRC="img2.png"
ALT="
"><I>CDO</I><SUB>C</SUB><I>HECK</I><SUB>T</SUB><I>YPE</I> & <I>ensuredisctypeisdataifopenedfordata</I><IMG
STYLE="" SRC="img2.png"
ALT="
">
</DIV><P></P>
<P>
<TT>The initial value of this register is <!– MATH
CDOAUTOCLOSE | CDOUSEFFLAGS | CDOLOCK
–>
<I>CDO</I><SUB>A</SUB><I>UTO</I><SUB>C</SUB><I>LOSE</I> | <I>CDO</I><SUB>U</SUB><I>SE</I><SUB>F</SUB><I>FLAGS</I> | <I>CDO</I><SUB>L</SUB><I>OCK</I>, reflecting my own view on user
interface and software standards. Before you protest, there are two
new <I>ioctl</I>s implemented in <TT>cdrom.c</TT>, that allow you to control the
behavior by software. These are:
</TT><P><!– MATH

$#$ & $/*$ #$*/$
CDROMSETOPTIONS &
setoptionsspecifiedin$(
int)
arg$
CDROMCLEAROPTIONS &
clearoptionsspecifiedin$(
int)
arg$
–>
</P>
<DIV ALIGN="CENTER">
<IMG
STYLE="" SRC="img1.png"
ALT="
"># & /*#*/<IMG
STYLE="" SRC="img2.png"
ALT="
"><I>CDROM</I><SUB>S</SUB><I>ET</I><SUB>O</SUB><I>PTIONS</I> & <I>setoptionsspecifiedin</I>
( < I > int < /I > ) & nbsp; < I > arg < /I ><IMG
STYLE="" SRC="img2.png"
ALT="
"><I>CDROM</I><SUB>C</SUB><I>LEAR</I><SUB>O</SUB><I>PTIONS</I> & <I>clearoptionsspecifiedin</I>
( < I > int < /I > ) & nbsp; < I > arg < /I ><IMG
STYLE="" SRC="img2.png"
ALT="
">
</DIV><P></P><TT>
One option needs some more explanation: <!– MATH
CDOUSEFFLAGS
–>
<I>CDO</I><SUB>U</SUB><I>SE</I><SUB>F</SUB><I>FLAGS</I>. In the next
section we explain what the need for this option is.
</TT>
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