<?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> The symbolic constants for error numbers are defined in <filename class="headerfile">errno.h</filename> in <filename class="directory">/usr/include/sys</filename>. </para>