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<td bgcolor="#cccccc"><span class="style1" style="margin-left:5px">sys_ftruncate <span class="style2">[fs/open.c] </span></span></td>
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<td><p style="margin-left:22px;margin-top:0px"><br />
Truncates a file to the specified length. This system call is identical to <a href="092.html">sys_truncate</a> except it uses a file descriptor for specifying the file. </p>
<p style="margin-left:10px"><strong>Arguments</strong></p>
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<td width="6%" valign="top"><em>eax</em></td>
<td width="94%">93</td>
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<td valign="top"><em>ebx</em></td>
<td>File descriptor. The file must be open for writing. </td>
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<td valign="top"><em>ecx</em></td>
<td>Number of bytes to truncate. If the file size is smaller that this value, it will be extended by this number of bytes.</td>
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<p style="margin-left:10px" ><strong>Return values</strong></p>
<p style="margin-left:22px;margin-right:10px" >If the system call succeeds the return value is 0. <br />
If the system call fails the return value is one of the following <em>errno</em> values: </p>
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<td width="16%" valign="top"><code>-EBADF</code></td>
<td width="84%"><code>The <em>ebx</em> is not a valid descriptor</code></td>
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<td valign="top"><code>-EBADF, -EINVAL </code></td>
<td><code>The file is not open for writing. </code></td>
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<td valign="top"><code>-EINVAL</code></td>
<td><code>The file descriptor does not reference a regular file.</code></td>
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<p style="margin-left:10px"><strong>Remarks</strong></p>
<p style="margin-left:22px">The file offset is not changed. </p>
<p style="margin-left:10px"><strong>Compatibility</strong></p>
<p style="margin-left:22px">n/a</p></td>
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