ibm-information-center/dist/eclipse/plugins/i5OS.ic.apis_5.4.0.1/rapi_getfd.htm

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<title>rapi_getfd()--Get descriptor to wait on</title>
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<h2>rapi_getfd()--Get descriptor to wait on</h2>
<div class="box" style="width: 60%;">
<br>
&nbsp;&nbsp;Syntax<br>
<pre>
#include &lt;rapi.h&gt;
int rapi_getfd( rapi_sid_t SessID)
</pre>
<br>
&nbsp;&nbsp;Service program name: QSYS/QTOQRAPI<br>
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&nbsp;&nbsp;Default public authority: *EXCLUDE<br>
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&nbsp;&nbsp;Threadsafe: Yes<br>
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<p>The <strong>rapi_getfd()</strong> API returns the file descriptor associated
with a successful <strong>rapi_session()</strong> call. This descriptor is
valid until <strong>rapi_release()</strong> has been called. When a read event
is signaled on this file descriptor, the application should
use<strong>rapi_dispatch()</strong> to call the RAPI message-handling routine
to handle the event.</p>
<br>
<h3>Parameters</h3>
<dl>
<dt><strong><em>SessID</em></strong></dt>
<dd>(Input) Required<br>
The session ID returned by a successful rapi_session() call.</dd>
</dl>
<br>
<h3>Authorities</h3>
<p>None.</p>
<br>
<h3>Return Value</h3>
<p>Returns a valid file descriptor if the SessID is valid.</p>
<p>Returns -1 if the SessID is not valid.</p>
<br>
<h3>Error Conditions</h3>
<p>None.</p>
<br>
<h3>Usage Notes</h3>
<p>The returned file descriptor can be used to wait on a select() or poll()
call; it also can be used to wait on a select() call for a response from an API
request. When the response is received, the <strong>rapi_dispatch()</strong>
API can be used to call the RAPI message-handling routine defined in the
<strong>rapi_session()</strong> call.</p>
<br>
<h3>Related Information</h3>
<p>For a description of the RSVP protocol, see RFC 2205 on the RFC Pages for <a
href="http://www.ietf.org/rfc.html">The Internet Engineering Task
Force</a>.<img src="www.gif" alt="Link outside Information Center"></p>
<p>Complete documentation of the RAPI APIs can be found at <a href=
"http://www.opengroup.org/publications/catalog/c809.htm">The Open
Group</a>.<img src="www.gif" alt="Link outside Information Center"></p>
<br>
<hr>
API introduced: V5R1
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