317 lines
11 KiB
HTML
317 lines
11 KiB
HTML
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>Using Condition Management APIs</title>
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<h2>Using Condition Management APIs</h2>
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<h3><a name="ile3a2">How Conditions Are Represented</a></h3>
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A condition token is used to communicate information about a condition to ILE
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CEE APIs. It is also used to communicate information to the condition manager,
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to message services, and to procedures.
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<p>The ILE <strong>condition token</strong> is a 12-byte compound data type
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that contains structured fields to convey aspects of a condition. It conveys
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aspects such as the severity, the associated message number, and information
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that is specific to the given instance of the condition.</p>
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<br>
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<h3><a name="ile3a3">Condition Token Layout</a></h3>
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<p><a href="#FIGCECTOK1">ILE Condition Token
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Layout</a> displays a map of the condition
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token.</p>
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<p><strong><a name="FIGCECTOK1">ILE Condition Token
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Layout</a></strong><br>
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<strong><br>
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<img src="Rv3w220.gif" alt="ILE Condition Token Layout"><br>
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</strong><br>
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</p>
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<p>Every condition token contains the components indicated in the figure
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above.</p>
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<dl>
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<dt><strong>Condition_ID</strong></dt>
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<dd>A 4-byte identifier that, with the Facility_ID, describes the condition
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that the token communicates. ILE CEE APIs and most applications produce Case 1
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conditions.<br>
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<br>
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</dd>
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<dt><strong><a name="SPTCASE">Case</a></strong></dt>
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<dd>A 2-bit field that defines the format of the Condition_ID portion of the
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token. ILE conditions are always Case 1.<br>
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<br>
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</dd>
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<dt><strong>Severity</strong></dt>
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<dd>A 3-bit binary integer that indicates the condition's severity. Severity
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and MsgSev contain the same information. See <a href=
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"ile3a1TOC.htm#TBLCLCHMH2">Table 1</a> for a list of ILE condition severities.
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See <a href="ile3a1TOC.htm#TBLCHMAP1">Table 2</a> and <a href=
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"ile3a1TOC.htm#TBLCHMAP2">Table 3</a> for the corresponding i5/OS<SUP>(TM)</SUP> message
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severities.<br>
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<br>
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</dd>
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<dt><strong><a name="SPTCONTROL">Control</a></strong></dt>
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<dd>A 3-bit field containing flags that describe or control various aspects of
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condition handling. The third bit specifies whether the Facility--ID has been
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assigned by IBM.<br>
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<br>
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</dd>
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<dt><strong><a name="SPTFAC">Facility--ID</a></strong></dt>
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<dd>A 3-character alphanumeric string that identifies the facility that
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generated the condition. Although all ILE languages use ILE message and
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condition handling ILE CEE APIs, the actual run-time messages generated under
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ILE still carry the HLL identification in the Facility--ID.<br>
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<br>
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</dd>
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<dt><strong><a name="SPTISI">I--S--Info</a></strong></dt>
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<dd>A 4-byte field that identifies the instance specific information associated
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with a given instance of the condition. The instant specific information
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contains the reference key to the instance of the message associated with the
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condition token. If the message reference key is zero, there is no associated
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message.<br>
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<br>
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</dd>
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<dt><strong><a name="SPTMSGSEV">MsgSev</a></strong></dt>
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<dd>A 2-byte binary integer that indicates the condition's severity. MsgSev and
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Severity contain the same information. See <a href="ile3a1TOC.htm#TBLCLCHMH2">
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Table 1</a> for a list of ILE condition severities. See <a href=
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"ile3a1TOC.htm#TBLCHMAP1">Table 2</a> and <a href="ile3a1TOC.htm#TBLCHMAP2">
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Table 3</a> for the corresponding i5/OS message severities.<br>
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<br>
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</dd>
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<dt><strong><a name="SPTMSGNO">MsgNo</a></strong></dt>
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<dd>A 2-byte, hexadecimal number that identifies the message associated with
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the condition. The combination of Facility_ID and MsgNo uniquely identifies a
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condition.</dd>
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</dl>
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<br>
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<p><a href="ile3a1TOC.htm#TBLCLCHMH2">Table 1</a> contains default responses
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that the condition manager takes when a handler attempts to percolate a
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function check across a control boundary.</p>
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<p><strong><a name="TBLCLCHMH2">Table 1. Default Responses to Unhandled
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Exceptions</a></strong></p>
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<table border cellpadding="5">
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<tr>
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<th align="left" valign="bottom">Message Type</th>
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<th align="left" valign="bottom">Severity of Condition</th>
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<th align="left" valign="bottom">Condition Raised by the Signal a Condition
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(CEESGL) Bindable API</th>
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<th align="left" valign="bottom">Exception Originated from Any Other
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Source</th>
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</tr>
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<tr>
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<td align="left" valign="top">Status</td>
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<td align="left" valign="top">0 (Informative message)</td>
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<td align="left" valign="top">Return the unhandled condition.</td>
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<td align="left" valign="top">Resume without logging the message.</td>
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</tr>
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<tr>
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<td align="left" valign="top">Status</td>
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<td align="left" valign="top">1 (Warning)</td>
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<td align="left" valign="top">Return the unhandled condition.</td>
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<td align="left" valign="top">Resume without logging the message.</td>
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</tr>
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<tr>
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<td align="left" valign="top">Notify</td>
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<td align="left" valign="top">0 (Informative message)</td>
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<td align="left" valign="top">Not applicable.</td>
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<td align="left" valign="top">Log the notify message and send the default
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reply.</td>
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</tr>
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<tr>
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<td align="left" valign="top">Notify</td>
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<td align="left" valign="top">1 (Warning)</td>
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<td align="left" valign="top">Not applicable.</td>
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<td align="left" valign="top">Log the notify message and send the default
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reply.</td>
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</tr>
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<tr>
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<td align="left" valign="top">Escape</td>
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<td align="left" valign="top">2 (Error)</td>
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<td align="left" valign="top">Return the unhandled condition.</td>
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<td align="left" valign="top">Log the escape message and send a function check
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message to the call stack entry of the current resume point.</td>
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</tr>
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<tr>
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<td align="left" valign="top">Escape</td>
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<td align="left" valign="top">3 (Severe error)</td>
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<td align="left" valign="top">Return the unhandled condition.</td>
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<td align="left" valign="top">Log the escape message and send a function check
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message to the call stack entry of the current resume point.</td>
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</tr>
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<tr>
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<td align="left" valign="top">Escape</td>
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<td align="left" valign="top">4 (Critical ILE error)</td>
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<td align="left" valign="top">Log the escape message and send a function check
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message to the call stack entry of the current resume point.</td>
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<td align="left" valign="top">Log the escape message and send a function check
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message to the call stack entry of the current resume point.</td>
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</tr>
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<tr>
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<td align="left" valign="top">Function check</td>
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<td align="left" valign="top">4 (Critical ILE error)</td>
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<td align="left" valign="top">Not applicable</td>
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<td align="left" valign="top">End the application, and send the CEE9901 message
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to the caller of the control boundary.</td>
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</tr>
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</table>
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<p><strong>Note:</strong> When the application is ended by an unhandled
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function check, the activation group is deleted if the control boundary is the
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oldest call stack entry in the activation group.</p>
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<p><a href="ile3a1TOC.htm#TBLCHMAP1">Table 2</a> and <a href=
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"ile3a1TOC.htm#TBLCHMAP2">Table 3</a> show how ILE condition severity maps to
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i5/OS message severity.</p>
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<p><strong><a name="TBLCHMAP1">Table 2. Mapping i5/OS *ESCAPE Message
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Severities to ILE Condition Severities</a></strong></p>
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<table border cellpadding="5">
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<tr>
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<th align="left" valign="bottom">From i5/OS Message Severity</th>
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<th align="left" valign="bottom">To ILE Condition Severity</th>
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<th align="left" valign="bottom">To i5/OS Message Severity</th>
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</tr>
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<tr>
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<td align="left" valign="top">0-29</td>
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<td align="left" valign="top">2</td>
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<td align="left" valign="top">20</td>
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</tr>
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<tr>
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<td align="left" valign="top">30-39</td>
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<td align="left" valign="top">3</td>
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<td align="left" valign="top">30</td>
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</tr>
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<tr>
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<td align="left" valign="top">40-99</td>
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<td align="left" valign="top">4</td>
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<td align="left" valign="top">40</td>
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</tr>
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</table>
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<p><strong><a name="TBLCHMAP2">Table 3. Mapping i5/OS *STATUS and *NOTIFY
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Message Severities to ILE Condition Severities</a></strong></p>
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<table border cellpadding="5">
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<tr>
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<th align="left" valign="bottom">From i5/OS Message Severity</th>
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<th align="left" valign="bottom">To ILE Condition Severity</th>
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<th align="left" valign="bottom">To i5/OS Message Severity</th>
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</tr>
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<tr>
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<td align="left" valign="top">0</td>
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<td align="left" valign="top">0</td>
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<td align="left" valign="top">0</td>
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</tr>
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<tr>
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<td align="left" valign="top">1-99</td>
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<td align="left" valign="top">1</td>
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<td align="left" valign="top">10</td>
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</tr>
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</table>
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<br>
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<br>
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<h3><a name="ile3a4">Condition Token Testing</a></h3>
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<p>You can test a condition token that is returned from an ILE CEE API for the
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following:</p>
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<dl>
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<dt><strong>Success</strong></dt>
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<dd>To test for success, determine if the first 4 bytes are 0. If the first 4
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bytes are 0, the remainder of the condition token is 0, indicating a successful
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call was made to the ILE CEE API.<br>
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<br>
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</dd>
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<dt><strong>Equivalent Tokens</strong></dt>
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<dd>To determine whether two condition tokens are equivalent (that is, the same
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<em>type</em> of condition token, but not the same <em>instance</em> of the
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condition token), compare the first 8 bytes of each condition token with one
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another. These bytes are static and do not change depending upon the given
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instance when the condition occurs.<br>
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<br>
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</dd>
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<dt><strong>Equal Tokens</strong></dt>
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<dd>To determine whether two condition tokens are equal (that is, they
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represent the same <em>instance</em> of a condition), compare all 12 bytes of
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each condition token with one another. The last 4 bytes can change from
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instance to instance of a condition.</dd>
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</dl>
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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">
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<a href="#Top_Of_Page">Top</a> |
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<a href="ile1a1.htm">ILE CEE 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>
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</center>
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</body>
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