lwres_hstrerror.docbook

非常好的dns解析软件

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<!-- $Id: lwres_hstrerror.docbook,v 1.5.18.5 2007/01/29 23:57:21 marka Exp $ -->
<refentry>

  <refentryinfo>
    <date>Jun 30, 2000</date>
  </refentryinfo>

  <refmeta>
    <refentrytitle>lwres_hstrerror</refentrytitle>
    <manvolnum>3</manvolnum>
    <refmiscinfo>BIND9</refmiscinfo>
  </refmeta>

  <docinfo>
    <copyright>
      <year>2004</year>
      <year>2005</year>
      <year>2007</year>
      <holder>Internet Systems Consortium, Inc. ("ISC")</holder>
    </copyright>
    <copyright>
      <year>2000</year>
      <year>2001</year>
      <holder>Internet Software Consortium.</holder>
    </copyright>
  </docinfo>

  <refnamediv>
    <refname>lwres_herror</refname>
    <refname>lwres_hstrerror</refname>
    <refpurpose>lightweight resolver error message generation</refpurpose>
  </refnamediv>
  <refsynopsisdiv>
    <funcsynopsis>
<funcsynopsisinfo>#include &lt;lwres/netdb.h&gt;</funcsynopsisinfo>
<funcprototype>
        <funcdef>
void
<function>lwres_herror</function></funcdef>
        <paramdef>const char *<parameter>s</parameter></paramdef>
        </funcprototype>
<funcprototype>
        <funcdef>
const char *
<function>lwres_hstrerror</function></funcdef>
        <paramdef>int <parameter>err</parameter></paramdef>
      </funcprototype>
</funcsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>DESCRIPTION</title>

    <para><function>lwres_herror()</function>
      prints the string <parameter>s</parameter> on
      <type>stderr</type> followed by the string generated by
      <function>lwres_hstrerror()</function> for the error code stored
      in the global variable <constant>lwres_h_errno</constant>.
    </para>

    <para><function>lwres_hstrerror()</function>
      returns an appropriate string for the error code gievn by
      <parameter>err</parameter>.  The values of the error codes and
      messages are as follows:

      <variablelist>
        <varlistentry>
          <term><errorcode>NETDB_SUCCESS</errorcode></term>
          <listitem>
            <para><errorname>Resolver Error 0 (no error)</errorname>
            </para>
          </listitem>
        </varlistentry>
        <varlistentry>
          <term><errorcode>HOST_NOT_FOUND</errorcode></term>
          <listitem>
            <para><errorname>Unknown host</errorname>
            </para>
          </listitem>
        </varlistentry>
        <varlistentry>
          <term><errorcode>TRY_AGAIN</errorcode></term>
          <listitem>
            <para><errorname>Host name lookup failure</errorname>
            </para>
          </listitem>
        </varlistentry>
        <varlistentry>
          <term><errorcode>NO_RECOVERY</errorcode></term>
          <listitem>
            <para><errorname>Unknown server error</errorname>
            </para>
          </listitem>
        </varlistentry>
        <varlistentry>
          <term><errorcode>NO_DATA</errorcode></term>
          <listitem>
            <para><errorname>No address associated with name</errorname>
            </para>
          </listitem>
        </varlistentry>
      </variablelist>
    </para>
  </refsect1>

  <refsect1>
    <title>RETURN VALUES</title>
    <para>
      The string <errorname>Unknown resolver error</errorname> is returned by
      <function>lwres_hstrerror()</function>
      when the value of
      <constant>lwres_h_errno</constant>
      is not a valid error code.
    </para>
  </refsect1>
  <refsect1>
    <title>SEE ALSO</title>
    <para><citerefentry>
        <refentrytitle>herror</refentrytitle><manvolnum>3</manvolnum>
      </citerefentry>,

      <citerefentry>
        <refentrytitle>lwres_hstrerror</refentrytitle><manvolnum>3</manvolnum>
      </citerefentry>.
    </para>

  </refsect1>
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