lass="listitem"><p>
     <code class="function">errmsg(const char *msg, ...)</code> specifies the primary error
     message text, and possibly run-time values to insert into it.  Insertions
     are specified by <code class="function">sprintf</code>-style format codes.  In addition to
     the standard format codes accepted by <code class="function">sprintf</code>, the format
     code <code class="literal">%m</code> can be used to insert the error message returned
     by <code class="function">strerror</