728 lines
25 KiB
XML
728 lines
25 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
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"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
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<!ENTITY % defs SYSTEM "/xserver/doc/xml/xserver.ent"> %defs;
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]>
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<article id="Xserver-DTrace">
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<articleinfo>
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<title>Xserver Provider for DTrace</title>
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<author>
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<firstname>Alan</firstname><surname>Coopersmith</surname>
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<affiliation>
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<orgname>Oracle Corporation</orgname>
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<orgdiv>Solaris Engineering</orgdiv>
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</affiliation>
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</author>
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<releaseinfo>X Server Version &xserver.version;</releaseinfo>
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<copyright><year>2005</year><year>2006</year><year>2007</year><year>2010</year>
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<holder>Oracle and/or its affiliates. All rights reserved.</holder>
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</copyright>
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<legalnotice id="copyright">
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<para>
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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</para><para>
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The above copyright notice and this permission notice (including the next
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paragraph) shall be included in all copies or substantial portions of the
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Software.
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</para><para>
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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</para>
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</legalnotice>
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</articleinfo>
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<sect1 id="introduction">
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<title>Introduction</title>
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<para>
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This page provides details on a
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<ulink url="http://wikis.sun.com/display/DTrace/Statically+Defined+Tracing+for+User+Applications">statically defined user application tracing provider</ulink>
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for the
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<ulink url="http://hub.opensolaris.org/bin/view/Community+Group+dtrace/">DTrace</ulink>
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facility in <productname>Solaris</productname> 10,
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<productname>MacOS X</productname> 10.5, and later releases. This
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provider instruments various points in the X server, to allow
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tracing what client applications are up to. DTrace probes may be used
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with <ulink url="http://sourceware.org/systemtap/">SystemTap</ulink>
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on GNU/Linux systems.
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</para>
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<para>
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The provider was integrated into the X.Org code base
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with Solaris 10 & OpenSolaris support for the Xserver 1.4 release,
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released in 2007 with X11R7.3. Support for DTrace on MacOS X
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was added in Xserver 1.7.
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</para>
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<para>
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These probes expose the request and reply structure of the X protocol
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between clients and the X server, so an understanding of that basic
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nature will aid in learning how to use these probes.
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</para>
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</sect1>
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<sect1 id="probes">
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<title>Available probes</title>
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<para>
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Due to the way User-Defined DTrace probes work, arguments to
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these probes all bear undistinguished names of
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<parameter>arg0</parameter>, <parameter>arg1</parameter>,
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<parameter>arg2</parameter>, etc. These tables should help you
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determine what the real data is for each of the probe arguments.
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<table id="Probes_and_their_arguments">
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<title>Probes and their arguments</title>
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<tgroup cols='9'>
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<colspec colname="probe" colwidth="2*"/>
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<colspec colname="desc" colwidth="3*"/>
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<colspec colname="arg0" colwidth="1*"/>
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<colspec colname="arg1" colwidth="1*"/>
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<colspec colname="arg2" colwidth="1*"/>
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<colspec colname="arg3" colwidth="1*"/>
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<colspec colname="arg4" colwidth="1*"/>
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<colspec colname="arg5" colwidth="1*"/>
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<colspec colname="arg6" colwidth="1*"/>
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<spanspec spanname="all" namest="probe" nameend="arg4"/>
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<thead>
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<row>
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<entry>Probe name</entry>
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<entry>Description</entry>
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<entry>arg0</entry>
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<entry>arg1</entry>
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<entry>arg2</entry>
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<entry>arg3</entry>
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<entry>arg4</entry>
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<entry>arg5</entry>
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<entry>arg6</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry spanname="all" class="grouphead">Request Probes</entry>
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</row>
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<row>
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<entry>request-start</entry>
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<entry>Called just before processing each client request.</entry>
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<entry><parameter>requestName</parameter></entry>
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<entry><parameter>requestCode</parameter></entry>
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<entry><parameter>requestLength</parameter></entry>
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<entry><parameter>clientId</parameter></entry>
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<entry><parameter>requestBuffer</parameter></entry>
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<entry nameend="arg5" class="unused"/>
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<entry nameend="arg6" class="unused"/>
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</row>
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<row>
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<entry>request-done</entry>
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<entry>Called just after processing each client request.</entry>
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<entry><parameter>requestName</parameter></entry>
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<entry><parameter>requestCode</parameter></entry>
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<entry><parameter>sequenceNumber</parameter></entry>
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<entry><parameter>clientId</parameter></entry>
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<entry><parameter>resultCode</parameter></entry>
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<entry nameend="arg5" class="unused"/>
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<entry nameend="arg6" class="unused"/>
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</row>
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<row>
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<entry spanname="all" class="grouphead">Event Probes</entry>
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</row>
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<row>
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<entry>send-event</entry>
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<entry>Called just before send each event to a client.</entry>
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<entry><parameter>clientId</parameter></entry>
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<entry><parameter>eventCode</parameter></entry>
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<entry><parameter>eventBuffer</parameter></entry>
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<entry nameend="arg3" class="unused"/>
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<entry nameend="arg4" class="unused"/>
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<entry nameend="arg5" class="unused"/>
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<entry nameend="arg6" class="unused"/>
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</row>
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<row>
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<entry spanname="all" class="grouphead">Client Connection Probes</entry>
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</row>
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<row>
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<entry>client-connect</entry>
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<entry>Called when a new connection is opened from a client</entry>
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<entry><parameter>clientId</parameter></entry>
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<entry><parameter>clientFD</parameter></entry>
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<entry nameend="arg2" class="unused"/>
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<entry nameend="arg3" class="unused"/>
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<entry nameend="arg4" class="unused"/>
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<entry nameend="arg5" class="unused"/>
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<entry nameend="arg6" class="unused"/>
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</row>
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<row>
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<entry>client-auth</entry>
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<entry>Called when client authenticates (normally just after connection opened)</entry>
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<entry><parameter>clientId</parameter></entry>
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<entry><parameter>clientAddr</parameter></entry>
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<entry><parameter>clientPid</parameter></entry>
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<entry><parameter>clientZoneId</parameter></entry>
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<entry nameend="arg4" class="unused"/>
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<entry nameend="arg5" class="unused"/>
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<entry nameend="arg6" class="unused"/>
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</row>
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<row>
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<entry>client-disconnect</entry>
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<entry>Called when a client connection is closed</entry>
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<entry><parameter>clientId</parameter></entry>
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<entry nameend="arg1" class="unused"/>
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<entry nameend="arg2" class="unused"/>
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<entry nameend="arg3" class="unused"/>
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<entry nameend="arg4" class="unused"/>
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<entry nameend="arg5" class="unused"/>
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<entry nameend="arg6" class="unused"/>
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</row>
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<row>
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<entry spanname="all" class="grouphead">Resource Allocation Probes</entry>
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</row>
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<row>
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<entry>resource-alloc</entry>
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<entry>Called when a new resource (pixmap, gc, colormap, etc.) is allocated</entry>
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<entry><parameter>resourceId</parameter></entry>
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<entry><parameter>resourceTypeId</parameter></entry>
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<entry><parameter>resourceValue</parameter></entry>
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<entry><parameter>resourceTypeName</parameter></entry>
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<entry nameend="arg4" class="unused"/>
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<entry nameend="arg5" class="unused"/>
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<entry nameend="arg6" class="unused"/>
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</row>
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<row>
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<entry>resource-free</entry>
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<entry>Called when a resource is freed</entry>
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<entry><parameter>resourceId</parameter></entry>
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<entry><parameter>resourceTypeId</parameter></entry>
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<entry><parameter>resourceValue</parameter></entry>
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<entry><parameter>resourceTypeName</parameter></entry>
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<entry nameend="arg4" class="unused"/>
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<entry nameend="arg5" class="unused"/>
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<entry nameend="arg6" class="unused"/>
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</row>
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<row>
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<entry spanname="all" class="grouphead">Input API probes</entry>
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</row>
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<row>
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<entry>input-event</entry>
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<entry>Called when an input event was submitted for processing</entry>
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<entry><parameter>deviceid</parameter></entry>
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<entry><parameter>eventtype</parameter></entry>
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<entry><parameter>button</parameter> or
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<parameter>keycode</parameter> or
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<parameter>touchid</parameter></entry>
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<entry><parameter>flags</parameter></entry>
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<entry><parameter>nvalues</parameter></entry>
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<entry><parameter>mask</parameter></entry>
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<entry><parameter>values</parameter></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</para>
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</sect1>
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<sect1 id="arguments">
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<title>Data Available in Probe Arguments</title>
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<para>
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To access data in arguments of type <type>string</type>, you will need
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to use <ulink url="http://wikis.sun.com/display/DTrace/Actions+and+Subroutines#ActionsandSubroutines-{{copyinstr}}"><function>copyinstr()</function></ulink>.
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To access data buffers referenced via <type>uintptr_t</type>'s, you will
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need to use <ulink url="http://wikis.sun.com/display/DTrace/Actions+and+Subroutines#ActionsandSubroutines-{{copyin}}"><function>copyin()</function></ulink>.
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<table id="Probe_Arguments">
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<title>Probe Arguments</title>
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<tgroup cols='3'>
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<colspec colname="arg" colwidth="2*"/>
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<colspec colname="type" colwidth="1*"/>
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<colspec colname="desc" colwidth="7*"/>
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<thead>
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<row>
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<entry>Argument name</entry>
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<entry>Type</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><parameter>clientAddr</parameter></entry>
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<entry><type>string</type></entry>
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<entry>String representing address client connected from</entry>
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</row>
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<row>
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<entry><parameter>clientFD</parameter></entry>
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<entry><type>int</type></entry>
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<entry>X server's file descriptor for server side of each connection</entry>
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</row>
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<row>
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<entry><parameter>clientId</parameter></entry>
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<entry><type>int</type></entry>
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<entry>Unique integer identifier for each connection to the
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X server</entry>
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</row>
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<row>
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<entry><parameter>clientPid</parameter></entry>
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<entry><type>pid_t</type></entry>
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<entry>Process id of client, if connection is local
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(from <function>getpeerucred()</function>)</entry>
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</row>
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<row>
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<entry><parameter>clientZoneId</parameter></entry>
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<entry><type>zoneid_t</type></entry>
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<entry>Solaris: Zone id of client, if connection is local
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(from <function>getpeerucred()</function>)</entry>
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</row>
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<row>
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<entry><parameter>eventBuffer</parameter></entry>
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<entry><type>uintptr_t</type></entry>
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<entry>Pointer to buffer containing X event - decode using
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structures in
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<<ulink url="http://cgit.freedesktop.org/xorg/proto/xproto/tree/Xproto.h"><filename class="headerfile">X11/Xproto.h</filename></ulink>>
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and similar headers for each extension</entry>
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</row>
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<row>
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<entry><parameter>eventCode</parameter></entry>
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<entry><type>uint8_t</type></entry>
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<entry>Event number of X event</entry>
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</row>
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<row>
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<entry><parameter>resourceId</parameter></entry>
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<entry><type>uint32_t</type></entry>
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<entry>X resource id (XID)</entry>
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</row>
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<row>
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<entry><parameter>resourceTypeId</parameter></entry>
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<entry><type>uint32_t</type></entry>
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<entry>Resource type id</entry>
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</row>
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<row>
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<entry><parameter>resourceTypeName</parameter></entry>
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<entry><type>string</type></entry>
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<entry>String representing X resource type
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(<literal>"PIXMAP"</literal>, etc.)</entry>
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</row>
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<row>
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<entry><parameter>resourceValue</parameter></entry>
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<entry><type>uintptr_t</type></entry>
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<entry>Pointer to data for X resource</entry>
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</row>
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<row>
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<entry><parameter>resultCode</parameter></entry>
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<entry><type>int</type></entry>
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<entry>Integer code representing result status of request</entry>
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</row>
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<row>
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<entry><parameter>requestBuffer</parameter></entry>
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<entry><type>uintptr_t</type></entry>
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<entry>Pointer to buffer containing X request - decode using
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structures in
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<<ulink url="http://cgit.freedesktop.org/xorg/proto/xproto/tree/Xproto.h"><filename class="headerfile">X11/Xproto.h</filename></ulink>>
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and similar headers for each extension</entry>
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</row>
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<row>
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<entry><parameter>requestCode</parameter></entry>
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<entry><type>uint8_t</type></entry>
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<entry>Request number of X request or Extension</entry>
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</row>
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<row>
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<entry><parameter>requestName</parameter></entry>
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<entry><type>string</type></entry>
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<entry>Name of X request or Extension</entry>
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</row>
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<row>
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<entry><parameter>requestLength</parameter></entry>
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<entry><type>uint16_t</type></entry>
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<entry>Length of X request</entry>
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</row>
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<row>
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<entry><parameter>sequenceNumber</parameter></entry>
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<entry><type>uint32_t</type></entry>
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<entry>Number of X request in in this connection</entry>
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</row>
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<row>
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<entry><parameter>deviceid</parameter></entry>
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<entry><type>int</type></entry>
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<entry>The device's numerical ID</entry>
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</row>
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<row>
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<entry><parameter>eventtype</parameter></entry>
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<entry><type>int</type></entry>
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<entry>Protocol event type</entry>
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</row>
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<row>
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<entry><parameter>button, keycode, touchid</parameter></entry>
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<entry><type>uint32_t</type></entry>
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<entry>The button number, keycode or touch ID</entry>
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</row>
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<row>
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<entry><parameter>flags</parameter></entry>
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<entry><type>uint32_t</type></entry>
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<entry>Miscellaneous event-specific server flags</entry>
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</row>
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<row>
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<entry><parameter>nvalues</parameter></entry>
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<entry><type>int8_t</type></entry>
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<entry>Number of bits in <parameter>mask</parameter> and number of elements
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in <parameter>values</parameter></entry>
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</row>
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<row>
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<entry><parameter>mask</parameter></entry>
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<entry><type>uint8_t*</type></entry>
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<entry>Binary mask indicating which indices in <parameter>values</parameter> contain
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valid data</entry>
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</row>
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<row>
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<entry><parameter>values</parameter></entry>
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<entry><type>double*</type></entry>
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<entry>Valuator values. Values for indices for which the
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<parameter>mask</parameter> is not set are undefined</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</para>
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</sect1>
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<sect1 id="examples">
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<title>Examples</title>
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<example id="Counting_requests_by_request_name">
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<title>Counting requests by request name</title>
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<para>
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This script simply increments a counter for each different request
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made, and when you exit the script (such as by hitting
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<keycombo action='simul'><keycap>Control</keycap><keycap>C</keycap>
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</keycombo>) prints the counts.
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<programlisting>
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#!/usr/sbin/dtrace -s
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Xserver*:::request-start
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{
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@counts[copyinstr(arg0)] = count();
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}
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</programlisting>
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The output from a short run may appear as:
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<screen>
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QueryPointer 1
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CreatePixmap 2
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FreePixmap 2
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PutImage 2
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ChangeGC 10
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CopyArea 10
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CreateGC 14
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FreeGC 14
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RENDER 28
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SetClipRectangles 40
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</screen>
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</para>
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<para>
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This can be rewritten slightly to cache the string containing the name
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of the request since it will be reused many times, instead of copying
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it over and over from the kernel:
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<programlisting>
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#!/usr/sbin/dtrace -s
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string Xrequest[uintptr_t];
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Xserver*:::request-start
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/Xrequest[arg0] == ""/
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{
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Xrequest[arg0] = copyinstr(arg0);
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}
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Xserver*:::request-start
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{
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@counts[Xrequest[arg0]] = count();
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}
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</programlisting>
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</para>
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</example>
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<example id="Get_average_CPU_time_per_request">
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<title>Get average CPU time per request</title>
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<para>This script records the CPU time used between the probes at
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the start and end of each request and aggregates it per request type.
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<programlisting>
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#!/usr/sbin/dtrace -s
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Xserver*:::request-start
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{
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reqstart = vtimestamp;
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}
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Xserver*:::request-done
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{
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@times[copyinstr(arg0)] = avg(vtimestamp - reqstart);
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}
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</programlisting>
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The output from a sample run might look like:
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<screen>
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ChangeGC 889
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MapWindow 907
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SetClipRectangles 1319
|
|
PolyPoint 1413
|
|
PolySegment 1434
|
|
PolyRectangle 1828
|
|
FreeCursor 1895
|
|
FreeGC 1950
|
|
CreateGC 2244
|
|
FreePixmap 2246
|
|
GetInputFocus 2249
|
|
TranslateCoords 8508
|
|
QueryTree 8846
|
|
GetGeometry 9948
|
|
CreatePixmap 12111
|
|
AllowEvents 14090
|
|
GrabServer 14791
|
|
MIT-SCREEN-SAVER 16747
|
|
ConfigureWindow 22917
|
|
SetInputFocus 28521
|
|
PutImage 240841
|
|
|
|
</screen>
|
|
</para>
|
|
</example>
|
|
|
|
<example id="Monitoring_clients_that_connect_and_disconnect">
|
|
<title>Monitoring clients that connect and disconnect</title>
|
|
|
|
<para>
|
|
This script simply prints information about each client that
|
|
connects or disconnects from the server while it is running.
|
|
Since the provider is specified as <code>Xserver$1</code> instead
|
|
of <code>Xserver*</code> like previous examples, it won't monitor
|
|
all Xserver processes running on the machine, but instead expects
|
|
the process id of the X server to monitor to be specified as the
|
|
argument to the script.
|
|
|
|
<programlisting>
|
|
#!/usr/sbin/dtrace -s
|
|
|
|
Xserver$1:::client-connect
|
|
{
|
|
printf("** Client Connect: id %d\n", arg0);
|
|
}
|
|
|
|
Xserver$1:::client-auth
|
|
{
|
|
printf("** Client auth'ed: id %d => %s pid %d\n",
|
|
arg0, copyinstr(arg1), arg2);
|
|
}
|
|
|
|
Xserver$1:::client-disconnect
|
|
{
|
|
printf("** Client Disconnect: id %d\n", arg0);
|
|
}
|
|
</programlisting>
|
|
|
|
A sample run:
|
|
|
|
<screen>
|
|
<prompt>#</prompt> <userinput>./foo.d 5790</userinput>
|
|
<computeroutput>dtrace: script './foo.d' matched 4 probes
|
|
CPU ID FUNCTION:NAME
|
|
0 15774 CloseDownClient:client-disconnect ** Client Disconnect: id 65
|
|
|
|
2 15774 CloseDownClient:client-disconnect ** Client Disconnect: id 64
|
|
|
|
0 15773 EstablishNewConnections:client-connect ** Client Connect: id 64
|
|
|
|
0 15772 AuthAudit:client-auth ** Client auth'ed: id 64 => local host pid 2034
|
|
|
|
0 15773 EstablishNewConnections:client-connect ** Client Connect: id 65
|
|
|
|
0 15772 AuthAudit:client-auth ** Client auth'ed: id 65 => local host pid 2034
|
|
|
|
0 15774 CloseDownClient:client-disconnect ** Client Disconnect: id 64
|
|
</computeroutput>
|
|
</screen>
|
|
|
|
</para>
|
|
</example>
|
|
|
|
<example id="Monitoring_clients_creating_Pixmaps">
|
|
<title>Monitoring clients creating Pixmaps</title>
|
|
|
|
<para>
|
|
This script can be used to determine which clients are creating
|
|
pixmaps in the X server, printing information about each client
|
|
as it connects to help trace it back to the program on the other
|
|
end of the X connection.
|
|
|
|
<programlisting>
|
|
#!/usr/sbin/dtrace -qs
|
|
|
|
string Xrequest[uintptr_t];
|
|
string Xrestype[uintptr_t];
|
|
|
|
Xserver$1:::request-start
|
|
/Xrequest[arg0] == ""/
|
|
{
|
|
Xrequest[arg0] = copyinstr(arg0);
|
|
}
|
|
|
|
Xserver$1:::resource-alloc
|
|
/arg3 != 0 && Xrestype[arg3] == ""/
|
|
{
|
|
Xrestype[arg3] = copyinstr(arg3);
|
|
}
|
|
|
|
|
|
Xserver$1:::request-start
|
|
/Xrequest[arg0] == "X_CreatePixmap"/
|
|
{
|
|
printf("-> %s: client %d\n", Xrequest[arg0], arg3);
|
|
}
|
|
|
|
Xserver$1:::request-done
|
|
/Xrequest[arg0] == "X_CreatePixmap"/
|
|
{
|
|
printf("<- %s: client %d\n", Xrequest[arg0], arg3);
|
|
}
|
|
|
|
Xserver$1:::resource-alloc
|
|
/Xrestype[arg3] == "PIXMAP"/
|
|
{
|
|
printf("** Pixmap alloc: %08x\n", arg0);
|
|
}
|
|
|
|
|
|
Xserver$1:::resource-free
|
|
/Xrestype[arg3] == "PIXMAP"/
|
|
{
|
|
printf("** Pixmap free: %08x\n", arg0);
|
|
}
|
|
|
|
Xserver$1:::client-connect
|
|
{
|
|
printf("** Client Connect: id %d\n", arg0);
|
|
}
|
|
|
|
Xserver$1:::client-auth
|
|
{
|
|
printf("** Client auth'ed: id %d => %s pid %d\n",
|
|
arg0, copyinstr(arg1), arg2);
|
|
}
|
|
|
|
Xserver$1:::client-disconnect
|
|
{
|
|
printf("** Client Disconnect: id %d\n", arg0);
|
|
}
|
|
</programlisting>
|
|
|
|
Sample output from a run of this script:
|
|
<screen><computeroutput>
|
|
** Client Connect: id 17
|
|
** Client auth'ed: id 17 => local host pid 20273
|
|
-> X_CreatePixmap: client 17
|
|
** Pixmap alloc: 02200009
|
|
<- X_CreatePixmap: client 17
|
|
-> X_CreatePixmap: client 15
|
|
** Pixmap alloc: 01e00180
|
|
<- X_CreatePixmap: client 15
|
|
-> X_CreatePixmap: client 15
|
|
** Pixmap alloc: 01e00181
|
|
<- X_CreatePixmap: client 15
|
|
-> X_CreatePixmap: client 14
|
|
** Pixmap alloc: 01c004c8
|
|
<- X_CreatePixmap: client 14
|
|
** Pixmap free: 02200009
|
|
** Client Disconnect: id 17
|
|
** Pixmap free: 01e00180
|
|
** Pixmap free: 01e00181
|
|
</computeroutput></screen>
|
|
|
|
</para>
|
|
|
|
</example>
|
|
|
|
<example id="Input_API_monitoring_with_systemtap">
|
|
<title>Input API monitoring with SystemTap</title>
|
|
|
|
<para>
|
|
This script can be used to monitor events submitted by drivers to
|
|
the server for enqueuing. Due to the integration of the input API
|
|
probes, some server-enqueued events will show up too.
|
|
<programlisting>
|
|
# Compile+run with
|
|
# stap -g xorg.stp /usr/bin/Xorg
|
|
#
|
|
|
|
|
|
function print_valuators:string(nvaluators:long, mask_in:long, valuators_in:long) %{
|
|
int i;
|
|
unsigned char *mask = (unsigned char*)THIS->mask_in;
|
|
double *valuators = (double*)THIS->valuators_in;
|
|
char str[128] = {0};
|
|
char *s = str;
|
|
|
|
#define BitIsSet(ptr, bit) (((unsigned char*)(ptr))[(bit)>>3] & (1 << ((bit) & 7)))
|
|
|
|
s += sprintf(s, "nval: %d ::", (int)THIS->nvaluators);
|
|
for (i = 0; i < THIS->nvaluators; i++)
|
|
{
|
|
s += sprintf(s, " %d: ", i);
|
|
if (BitIsSet(mask, i))
|
|
s += sprintf(s, "%d", (int)valuators[i]);
|
|
}
|
|
|
|
sprintf(THIS->__retvalue, "%s", str);
|
|
%}
|
|
|
|
probe process(@1).mark("input__event")
|
|
{
|
|
deviceid = $arg1
|
|
type = $arg2
|
|
detail = $arg3
|
|
flags = $arg4
|
|
nvaluators = $arg5
|
|
|
|
str = print_valuators(nvaluators, $arg6, $arg7)
|
|
printf("Event: device %d type %d detail %d flags %#x %s\n",
|
|
deviceid, type, detail, flags, str);
|
|
}
|
|
</programlisting>
|
|
|
|
Sample output from a run of this script:
|
|
<screen><computeroutput>
|
|
Event: device 13 type 4 detail 1 flags 0x0 nval: 0 ::
|
|
Event: device 13 type 6 detail 0 flags 0xa nval: 1 :: 0: 1
|
|
Event: device 13 type 6 detail 0 flags 0xa nval: 2 :: 0: 2 1: -1
|
|
Event: device 13 type 6 detail 0 flags 0xa nval: 2 :: 0: 2 1: -1
|
|
Event: device 13 type 6 detail 0 flags 0xa nval: 2 :: 0: 4 1: -3
|
|
Event: device 13 type 6 detail 0 flags 0xa nval: 2 :: 0: 3 1: -3
|
|
Event: device 13 type 6 detail 0 flags 0xa nval: 2 :: 0: 3 1: -2
|
|
Event: device 13 type 6 detail 0 flags 0xa nval: 2 :: 0: 2 1: -2
|
|
Event: device 13 type 6 detail 0 flags 0xa nval: 2 :: 0: 2 1: -2
|
|
Event: device 13 type 6 detail 0 flags 0xa nval: 2 :: 0: 2 1: -2
|
|
Event: device 13 type 6 detail 0 flags 0xa nval: 2 :: 0: 1: -1
|
|
Event: device 13 type 6 detail 0 flags 0xa nval: 2 :: 0: 1: -1
|
|
Event: device 13 type 5 detail 1 flags 0x0 nval: 0 ::
|
|
</computeroutput></screen>
|
|
|
|
</para>
|
|
|
|
</example>
|
|
|
|
</sect1>
|
|
|
|
</article>
|