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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>8.�Diagnostics</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="YAZ User's Guide and Reference"><link rel="up" href="comstack.html" title="Chapter�9.�The COMSTACK Module"><link rel="prev" href="comstack.ssl.html" title="7.�SSL"><link rel="next" href="comstack.summary.html" title="9.�Summary and Synopsis"></head><body><link rel="stylesheet" type="text/css" href="common/style1.css"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">8.�Diagnostics</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="comstack.ssl.html">Prev</a>�</td><th width="60%" align="center">Chapter�9.�The COMSTACK Module</th><td width="20%" align="right">�<a accesskey="n" href="comstack.summary.html">Next</a></td></tr></table><hr></div><div class="sect1" lang="en"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="comstack.diagnostics"></a>8.�Diagnostics</h2></div></div></div><p>
    All functions return -1 if an error occurs. Typically, the functions
    will return 0 on success, but the data exchange functions
    (<code class="function">cs_get</code>, <code class="function">cs_put</code>,
    <code class="function">cs_more</code>) follow special rules. Consult their
    descriptions.
   </p><p>
    When a function (including the data exchange functions) reports an
    error condition, use the function
    <code class="function">cs_errno()</code> to determine the cause of the
    problem. The function
   </p><pre class="synopsis">
    void cs_perror(COMSTACK handle char *message);
   </pre><p>
    works like <code class="function">perror(2)</code> and prints the
    <code class="literal">message</code> argument, along with a system message, to
    <code class="literal">stderr</code>. Use the character array
   </p><pre class="synopsis">
    extern const char *cs_errlist[];
   </pre><p>
    to get hold of the message, if you want to process it differently.
    The function
   </p><pre class="synopsis">
    const char *cs_stackerr(COMSTACK handle);
   </pre><p>
    Returns an error message from the lower layer, if one has been
    provided.
   </p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="comstack.ssl.html">Prev</a>�</td><td width="20%" align="center"><a accesskey="u" href="comstack.html">Up</a></td><td width="40%" align="right">�<a accesskey="n" href="comstack.summary.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">7.�SSL�</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">�9.�Summary and Synopsis</td></tr></table></div></body></html>