<html> <head> <title>link</title> <body bgcolor=#ffffff> <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 <unistd.h><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%> </td><td> </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> </body> </html>