<?xml version="1.0"?> <!DOCTYPE para PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"> <para> On most UNIX systems, functions signal a <errorname>File Not Found</errorname> error by returning <errorcode>ENOENT</errorcode>, defined in <filename>errno.h</filename>. This is usually a <errortype>recoverable</errortype> (non-fatal) error. </para>