pty string. An unset line number is indicated as 0. An unset function name is indicated as &quot;&quot;, i.e. an empty string.</p>

<p>A pointer returned this way by these functions and the ones below is valid until the respective entry is overwritten in the error queue.</p>

<p>ERR_peek_error_line() and ERR_peek_last_error_line() are the same as ERR_peek_error() and ERR_peek_last_error(), but on success they additionally store the filename and line number where the error occurred in *<i>file</i> and *<i>li