325 lines
9.2 KiB
HTML
325 lines
9.2 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>waitDPIpacket()--Wait for a DPI Packet</title>
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<body>
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<script type="text/javascript" language="Javascript" src="../rzahg/synch.js">
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</script>
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<a name="Top_Of_Page"></a>
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<h2>waitDPIpacket()--Wait for a DPI Packet</h2>
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<div class="box" style="width: 65%;">
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<br>
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Syntax<br>
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<pre>
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#include <qtossapi.h>
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int waitDPIpacket(
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long int <em>timeout</em>,
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void <em>*dpimsgbuff_p</em>,
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unsigned long int <em>*length</em> );
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</pre>
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<br>
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Service Program Name: QTOSSAPI<br>
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<!-- iddvc RMBR -->
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<br>
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Default Public Authority: *USE<br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: No<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <strong>waitDPIpacket()</strong> function waits for a message on the
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data queue with which the subagent has previously connected (see <a href=
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"connsnmp.htm">connectSNMP()--Establish Connection with SNMP Agent</a>). When a
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Distributed Protocol Interface (DPI) packet arrives, this function receives the
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packet and copies it to a subagent buffer.</p>
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<br>
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<h3>Authorities</h3>
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<p>So that the subagent can receive messages from the SNMP agent, the following
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conditions must be met:</p>
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<ul>
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<li>The SNMP agent job must have write access to the data queue. If you suspect
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a problem with the data queue, check the job log of the SNMP agent job (QTMSNMP
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in subsystem QSYSWRK) for TCP4041 messages with reason code 001.</li>
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</ul>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong>timeout</strong></dt>
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<dd>(Input) The number of seconds that the subagent is willing to wait for a
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message (a call to this function will block the subagent until a message is
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received or until this timeout is reached).
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<p>Possible values have the indicated meaning;</p>
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<table cellpadding="5">
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<!-- cols="5 95" -->
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<tr>
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<td align="left" valign="top"><em>< 0</em></td>
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<td align="left" valign="top">Unlimited wait</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>0</em></td>
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<td align="left" valign="top">No wait. This causes an immediate return if a
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data queue message is not present.</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>> 0</em></td>
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<td align="left" valign="top">The number of seconds to wait (maximum is
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99999).</td>
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</tr>
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</table>
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<br>
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</dd>
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<dt><strong>dpimsgbuff_p</strong></dt>
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<dd>(I/O) A pointer to a buffer that is owned by the subagent. This will
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contain the serialized packet from the SNMP agent when <em>snmpsa_RC_ok</em> is
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returned. The maximum length of a DPI packet is SNMP_DPI_BUFSIZE, defined in
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the <strong><qtossapi.h></strong> file. The buffer will contain the data
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queue message itself if that message is not from the SNMP agent, and
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<strong>waitDPIpacket()</strong> will return
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<em>snmpsa_RC_nonagentmsg</em>.<br>
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<br>
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</dd>
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<dt><strong>length</strong></dt>
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<dd>(Output) When <em>snmpsa_RC_ok</em> is returned, the length (in bytes) of
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the DPI packet received. When <em>snmpsa_RC_nonagentmsg</em> is returned, the
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length of the data queue message. Otherwise, this value is 0.</dd>
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</dl>
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<br>
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<h3>Return Value</h3>
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<p>The return values are defined in the <strong><qtossapi.h></strong>
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file.</p>
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<table cellpadding="5">
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<!-- cols="5 95" -->
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<tr>
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<td align="left" valign="top"><em>0</em></td>
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<td align="left" valign="top"><em>snmpsa_RC_ok</em>
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<p>The routine was successful.</p>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>-1</em></td>
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<td align="left" valign="top"><em>snmpsa_RC_err</em>
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<p>An exception occurred. Check the subagent job log for the exception
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information, correct the condition, and resubmit the subagent job. (This return
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code is only used when a more specific return code is not available.)</p>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>-2</em></td>
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<td align="left" valign="top"><em>snmpsa_RC_noagent</em>
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<p>The SNMP agent is not available.</p>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>-3</em></td>
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<td align="left" valign="top"><em>snmpsa_RC_mismatch</em>
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<p>A previous DPI packet was found. The subagent may want to process this
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packet or call the <strong>receiveDPIpacket()</strong> function again to get
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the next packet.</p>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>-4</em></td>
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<td align="left" valign="top"><em>snmpsa_RC_timedout</em>
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<p>No message was received within the specified timeout.</p>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>-5</em></td>
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<td align="left" valign="top"><em>snmpsa_RC_nonagentmsg</em>
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<p>A data queue message arrived that is not from the SNMP agent.</p>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>-6</em></td>
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<td align="left" valign="top"><em>snmpsa_RC_dqinvalid</em>
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<p>The subagent data queue or library is invalid. This refers to the data queue
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and library used in the <strong>connectSNMP()</strong> call.</p>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>-7</em></td>
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<td align="left" valign="top"><em>snmpsa_RC_parmerr</em>
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<p>A parameter error occurred, probably a null pointer.</p>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>-8</em></td>
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<td align="left" valign="top"><em>snmpsa_RC_lengtherr</em>
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<p>A parameter was an incorrect length.</p>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>-9</em></td>
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<td align="left" valign="top"><em>snmpsa_RC_buffer</em>
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<p>Check the job log of the subagent for MCH3802. If found, the problem was
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likely due to agent workload, and the subagent can retry the request. If a
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different exception is found, see any messages in the job log, correct any
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errors that are indicated, and then retry the operation.</p>
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</td>
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</tr>
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<tr>
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<td align="left" valign="top"><em>-12</em></td>
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<td align="left" valign="top"><em>snmpsa_RC_connectfirst</em>
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<p>The subagent must connect to the SNMP agent before making this call.</p>
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</td>
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</tr>
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</table>
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<p>For more information, see "SNMP Subagent Problem Determination" in the <a
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href="../books/sc415412.pdf" target="_blank">Simple Network Management
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Protocol</a> <img src="wbpdf.gif" alt="Link to PDF"> book.</p>
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<br>
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<h3>Usage Notes</h3>
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<p>The <strong>waitDPIpacket()</strong> function waits for a message on the
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data queue that the subagent specified on the <strong>connectSNMP()</strong>
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call. When a data queue message is received, the corresponding DPI packet is
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copied to the specified subagent buffer.</p>
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<p>If a data queue message arrives that is not from the SNMP agent, then it is
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returned in the buffer and the code <em>snmpsa_RC_nonagentmsg</em> is
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returned.</p>
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<br>
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<h3>Related Information</h3>
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<ul>
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<li>The <<strong>qtossapi.h</strong>> file (see <a href="unix13.htm">Header
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Files for UNIX-Type Functions</a>)<br>
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<br>
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</li>
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<li><a href="connsnmp.htm">connectSNMP()</a>--Establish Connection with SNMP
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Agent<br>
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<br>
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</li>
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<li><a href="ppacsnmp.htm">pDPIpacket()</a>--Parse a DPI Packet</li>
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</ul>
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<br>
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<h3>Example</h3>
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<p>See <a href="../apiref/aboutapis.htm#codedisclaimer">Code disclaimer information</a>
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for information pertaining to code examples.</p>
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<pre>
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#include <qtossapi.h>
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#define MAX_LEN 4096
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#define waitTIMEOUT 300
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unsigned char *pack_p,
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dpimsgbuff[MAX_LEN];
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snmp_dpi_hdr *hdr_p;
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snmp_dpi_set_packet *set_p;
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long int num, length;
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for(;;) {
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rc = waitDPIpacket( waitTIMEOUT,
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&dpimsgbuff[0], length );
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if (rc<0) {
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/* Handle exceptions. */
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}
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else {
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hdr_p = pDPIpacket(pack_p); /* Parse incoming packet. */
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/* Assume it's in pack_p. */
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if (hdr_p) {
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/* Analyze packet, assume GET, no error. */
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set_p = mkDPIset(snmp_dpi_set_packet_NULL_p,
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"1.3.6.1.2.3.4.5.", "1.0",
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SNMP_TYPE_Integer32,
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sizeof(num), &num);
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if (set_p) {
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pack_p = mkDPIresponse(hdr_p,
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SNMP_ERROR_noError, 0L, set_p);
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if (pack_p) {
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/* Send packet to subagent. */
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} /*end if*/
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} /*end if*/
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} /*end if*/
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} /*end else*/
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} /*end for*/
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</pre>
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<br>
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<hr>
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API introduced: V3R6
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> |
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<a href="unix.htm">UNIX-Type APIs</a> |
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<a href="aplist.htm">APIs by category</a> </td>
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</tr>
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</table></center>
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</html>
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