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@@ -60,7 +60,7 @@ executable by group G and run with S rights.
<p>
But modern systems implement the
-<a href="https://cr.yp.to/docs/secureipc.html">getpeereid()</a>
+<a href="https://web.archive.org/web/20210504203038/https://www.superscript.com/ucspi-ipc/getpeereid.html">getpeereid()</a>
system call or library function. This function allows the server to know the
client's credentials: so fine-grained access control is possible. On those
systems, <strong>local services can do as much authentication as setuid programs,