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

<h3>Name</h3>
link - create hard link to a file

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

<h3>Synopsis</h3>
#include &lt;unistd.h&gt;<br>
<br>
int<br>
link(const char *<em>oldname</em>, const char *<em>newname</em>);

<h3>Description</h3>

link creates a new name, <em>newname</em>, for the file referred to by
<em>oldname</em>. Henceforth, both names are equally valid ways to
refer to the same file. The file is only deleted when all names are
removed. This is a "hard link".
<p>

The creation of the new name is atomic. The two names must be on the
same filesystem. Directories may not be hard-linked.
<p>

<h3>Return Values</h3>
On success, link 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>ENODEV</td>		<td>The device prefix of one of the names did
				not exist.</td></tr>
<tr><td>ENOTDIR</td>		<td>A non-final component of one of the names
				was not a directory.</td></tr>
<tr><td>ENOENT</td>		<td>A non-final component of <em>newname</em>  
				did not exist.</td></tr>
<tr><td>ENOENT</td>		<td><em>oldname</em> does not exist.</td></tr>
<tr><td>EEXIST</td>		<td><em>newname</em> already exists.</td></tr>
<tr><td>EISDIR</td>		<td><em>oldname</em> is a directory.</td></tr>
<tr><td>EXDEV</td>		<td>The two names are on different
				filesystems.</td></tr>
<tr><td>EMLINK</td>		<td>There are already too many links to
				<em>oldname</em>.</td></tr>
<tr><td>ENOSPC</td>		<td>The filesystem involved is full.</td></tr>
<tr><td>EIO</td>		<td>A hard I/O error occurred.</td></tr>
<tr><td>EFAULT</td>		<td>One of the arguments was an invalid pointer.</td></tr>
</table></blockquote>

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