open file for reading.
            ./
            <a href="prompt_c.html">prompt_c</a> ( &quot;Enter DSK name &gt; &quot;, FILSIZ, dsk );

            <a href="dasopr_c.html">dasopr_c</a> ( dsk,    &amp;handle );

            <a href="dlabfs_c.html">dlabfs_c</a> ( handle, &amp;dladsc, &amp;found );

            if ( !found )
            { 
               <a href="setmsg_c.html">setmsg_c</a> ( &quot;No segment found in file #.&quot; );
               <a href="errch_c.html">errch_c</a>  ( &quot;#&quot;,  dsk 