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<head><title>dkim_set_signature_handle()</title></head>
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<h1>dkim_set_signature_handle()</h1>
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<!---------- Synopsis ----------->
<tr><th valign="top" align=left width=150>SYNOPSIS</th><td>
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#include <dkim.h>
<a href="dkim_stat.html"><tt>DKIM_STAT</tt></a> dkim_set_signature_handle(
<a href="dkim_lib.html"><tt>DKIM_LIB</tt></a> *libopendkim,
void * (*func)(void *closure));
);
</pre>
Defines a callback function to be used for allocating local data storage
to be associated with signatures. <p>
From within <a href="dkim_eoh.html"><tt>dkim_eoh()</tt></a>, each discovered
signature is assigned a <a href="dkim_siginfo.html"><tt>DKIM_SIGINFO</tt></a>
handle. If this callback function is defined, it will be called once for each
such handle to allocate any caller-side storage that might be desired by
the caller; the return value is assumed to be a pointer to such storage,
and can be retrieved later by the caller during signature processing.
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<!----------- Description ---------->
<tr><th valign="top" align=left>DESCRIPTION</th><td>
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<th width="80">Called When</th>
<td><tt>dkim_set_signature_handle()</tt> must be called before
<a href="dkim_eoh.html"><tt>dkim_eoh()</tt></a> has been called. </td>
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<!----------- Arguments ---------->
<tr><th valign="top" align=left>ARGUMENTS</th><td>
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<tr bgcolor="#dddddd"><th>Argument</th><th>Description</th></tr>
<tr valign="top"><td>libopendkim</td>
<td>Library-specific handle, returned by
<a href="dkim_init.html"><tt>dkim_init()</tt></a>.
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<tr valign="top"><td>func</td>
<td>A pointer to a function which takes a single void pointer
that is the same as the <tt>memclosure</tt> passed to
<a href="dkim_verify.html"><tt>dkim_verify()</tt></a>.
If NULL, no callback will be used.
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<!----------- Return Values ---------->
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<th valign="top" align=left>RETURN VALUES</th>
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<li>DKIM_STAT_OK -- success
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<!----------- Notes ---------->
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<th valign="top" align=left>NOTES</th>
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<li>None.
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Copyright (c) 2007 Sendmail, Inc. and its suppliers.
All rights reserved.
<br>
Copyright (c) 2009, 2010, The OpenDKIM Project. All rights reserved.
<br>
By using this file, you agree to the terms and conditions set
forth in the respective licenses.
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