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<div class="CellBodyC" align="center"><a name="86148"> </a>21</div>
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<div class="CellBody"><a name="86150"> </a>Same as <b class="symbol_UC">FIOFLUSH</b>.&nbsp;</div>
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<div class="CellBody"><a name="86152"> </a><b class="symbol_UC">FIOBLKSIZEGET</b> &nbsp;</div>
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<div class="CellBodyC" align="center"><a name="86154"> </a>1001</div>
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<div class="CellBody"><a name="86156"> </a>Get the actual block size of the tape device by issuing a driver command to it. Check this value with that set in the <b class="symbol_UC">SEQ_DEV</b> data structure.&nbsp;</div>
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<div class="CellBody"><a name="86158"> </a><b class="symbol_UC">FIOBLKSIZESET</b> &nbsp;</div>
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<div class="CellBodyC" align="center"><a name="86160"> </a>1000</div>
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<div class="CellBody"><a name="86162"> </a>Set the block size of the tape device on the device and in the <b class="symbol_UC">SEQ_DEV</b> data structure.&nbsp;</div>
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<div class="CellBody"><a name="86164"> </a><b class="symbol_UC">MTIOCTOP</b> &nbsp;</div>
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<div class="CellBodyC" align="center"><a name="86166"> </a>1005</div>
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<div class="CellBody"><a name="86168"> </a>Perform a UNIX-like <b class="symbol_UC">MTIO</b> operation to the tape device. The type of operation and operation count is set in an <b class="symbol_UC">MTIO</b> structure passed to the <b class="routine"><i class="routine">ioctl</i></b><b>(&nbsp;)</b> routine. The <b class="symbol_UC">MTIO</b> operations are defined in <a href="c-filesys5.html#86186">Table&nbsp;4-9</a>.&nbsp;</div>
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<dd><p class="Body"><a name="86173"> </a>The <b class="symbol_UC">MTIOCTOP</b> operation is compatible with the UNIX <b class="symbol_UC">MTIOCTOP</b> operation. The argument passed to <b class="routine"><i class="routine">ioctl</i></b><b>(&nbsp;)</b> with <b class="symbol_UC">MTIOCTOP</b> is a pointer to an <b class="symbol_UC">MTOP</b> structure that contains the following two fields:</p>
<dl class="margin">

<dd><pre class="Code2"><b><a name="86174">typedef struct mtop  
    { 
    short mt_op;   /* operation */ 
    int  mt_count; /* number of operations */ 
    } MTOP;</a></b></pre>
</dl>

<dd><p class="Body"><a name="86914"> </a>The <b class="symbol_lc">mt_op</b> field contains the type of <b class="symbol_UC">MTIOCTOP</b> operation to perform. These operations are defined in <a href="c-filesys5.html#86186">Table&nbsp;4-9</a>. The <b class="symbol_lc">mt_count</b> field contains the number of times the operation defined in <b class="symbol_lc">mt_op</b> should be performed.<p class="table">
<h4 class="EntityTitle"><a name="86186"><font face="Helvetica, sans-serif" size="-1" class="sans">Table 4-9:&nbsp;&nbsp;<b class="symbol_UC">MTIOCTOP</b> Operations&nbsp;</font></a></h4>

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<div class="CellHeading"><b><a name="86192"> </a><font face="Helvetica, sans-serif" size="-1" class="sans">Function</font></b></div>
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<div class="CellHeadingC" align="center"><a name="86194"> </a><b><font face="Helvetica, sans-serif" size="-1" class="sans">Value</font></b></div>
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<div class="CellHeading"><b><a name="86196"> </a><font face="Helvetica, sans-serif" size="-1" class="sans">Meaning</font></b></div>
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<div class="CellBody"><a name="86198"> </a><b class="symbol_UC">MTWEOF</b> &nbsp;</div>
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<div class="CellBodyC" align="center"><a name="86200"> </a>0</div>
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<div class="CellBody"><a name="86202"> </a>Write an end-of-file record or "file mark."&nbsp;</div>
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<div class="CellBody"><a name="86204"> </a><b class="symbol_UC">MTFSF</b> &nbsp;</div>
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<div class="CellBodyC" align="center"><a name="86206"> </a>1</div>
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<div class="CellBody"><a name="86208"> </a>Forward space over file mark.&nbsp;</div>
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<div class="CellBody"><a name="86210"> </a><b class="symbol_UC">MTBSF</b> &nbsp;</div>
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<div class="CellBodyC" align="center"><a name="86212"> </a>2</div>
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<div class="CellBody"><a name="86214"> </a>Backward space over file mark.&nbsp;</div>
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<div class="CellBody"><a name="86216"> </a><b class="symbol_UC">MTFSR</b> &nbsp;</div>
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<div class="CellBodyC" align="center"><a name="86218"> </a>3</div>
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<div class="CellBody"><a name="86220"> </a>Forward space over data block.&nbsp;</div>
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<div class="CellBody"><a name="86222"> </a><b class="symbol_UC">MTBSR</b> &nbsp;</div>
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<div class="CellBodyC" align="center"><a name="86224"> </a>4</div>
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<td colspan=1 rowspan=1>
<div class="CellBody"><a name="86226"> </a>Backward space over data block.&nbsp;</div>
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<div class="CellBody"><a name="86228"> </a><b class="symbol_UC">MTREW</b>&nbsp;</div>
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<div class="CellBodyC" align="center"><a name="86230"> </a>5</div>
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<div class="CellBody"><a name="86232"> </a>Rewind the tape device to the beginning-of-medium.&nbsp;</div>
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<div class="CellBody"><a name="86234"> </a><b class="symbol_UC">MTOFFL</b> &nbsp;</div>
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<div class="CellBodyC" align="center"><a name="86236"> </a>6</div>
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<td colspan=1 rowspan=1>
<div class="CellBody"><a name="86238"> </a>Rewind and put the drive offline.&nbsp;</div>
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<div class="CellBody"><a name="86240"> </a><b class="symbol_UC">MTNOP</b> &nbsp;</div>
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<div class="CellBodyC" align="center"><a name="86242"> </a>7</div>
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<div class="CellBody"><a name="86244"> </a>No operation, sets status in the <b class="symbol_UC">SEQ_DEV</b> structure only.&nbsp;</div>
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<div class="CellBody"><a name="86246"> </a><b class="symbol_UC">MTRETEN</b> &nbsp;</div>
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<div class="CellBodyC" align="center"><a name="86248"> </a>8</div>
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<div class="CellBody"><a name="86250"> </a>Re-tension the tape (cartridge tape only).&nbsp;</div>
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<div class="CellBody"><a name="86252"> </a><b class="symbol_UC">MTERASE</b> &nbsp;</div>
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<div class="CellBodyC" align="center"><a name="86254"> </a>9</div>
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<td colspan=1 rowspan=1>
<div class="CellBody"><a name="86256"> </a>Erase the entire tape.&nbsp;</div>
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<div class="CellBody"><a name="86258"> </a><b class="symbol_UC">MTEOM</b> &nbsp;</div>
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<div class="CellBodyC" align="center"><a name="86260"> </a>10</div>
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<div class="CellBody"><a name="86262"> </a>Position tape to end-of-media.&nbsp;</div>
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<div class="CellBody"><a name="86264"> </a><b class="symbol_UC">MTNBSF</b> &nbsp;</div>
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<div class="CellBodyC" align="center"><a name="86266"> </a>11</div>
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<td colspan=1 rowspan=1>
<div class="CellBody"><a name="86269"> </a>Backward space file to beginning-of-medium.&nbsp;</div>
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