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<title>ftruncate</title>
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<h2 align=center>ftruncate</h2>
<h4 align=center>OS/161 Reference Manual</h4>

<h3>Name</h3>
ftruncate - set size of a file

<h3>Library</h3>
Standard C Library (libc, -lc)

<h3>Synopsis</h3>
#include &lt;unistd.h&gt;<br>
<br>
int<br>
ftruncate(int <em>fd</em>, off_t <em>filesize</em>);

<h3>Description</h3>

ftruncate forcibly sets the size of the file referred to by
<em>fd</em> to <em>filesize</em>. If this expands the file, the new
data appears as if it is zero-filled. If this shrinks the file, the
excess data is discarded.
<p>

The file must be open for write.

<h3>Return Values</h3>
On success, ftruncate returns 0. On error, -1 is returned, and
<A HREF=errno.html>errno</A> is set according to the error
encountered.

<h3>Errors</h3>

The following error codes should be returned under the conditions
given. Other error codes may be returned for other errors not
mentioned here.

<blockquote><table width=90%>
<td width=10%>&nbsp;</td><td>&nbsp;</td></tr>
<tr><td>EBADF</td>		<td><em>fd</em> is not a valid file handle, or
				it is not open for writing.</td></tr>
<tr><td>EIO</td>		<td>A hard I/O error occurred.</td></tr>
<tr><td>EFAULT</td>		<td><em>buf</em> points to an invalid address.</td></tr>
</table></blockquote>

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