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<?xml version='1.0'?>
<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
]>
<section id="inodewatch2sect">
<title>Monitoring Changes to File Attributes</title>
<indexterm>
<primary>script examples</primary>
<secondary>monitoring changes to file attributes</secondary>
</indexterm>
<indexterm>
<primary>examples of SystemTap scripts</primary>
<secondary>monitoring changes to file attributes</secondary>
</indexterm>
<indexterm>
<primary>monitoring changes to file attributes</primary>
<secondary>examples of SystemTap scripts</secondary>
</indexterm>
<indexterm>
<primary>changes to file attributes, monitoring</primary>
<secondary>examples of SystemTap scripts</secondary>
</indexterm>
<indexterm>
<primary>file attributes, monitoring changes to</primary>
<secondary>examples of SystemTap scripts</secondary>
</indexterm>
<remark>
WAR STORY: monitoring more inode activity http://sourceware.org/systemtap/wiki/WSFileMonitor2?highlight=((WarStories))
</remark>
<remark>
no script in examples
</remark>
<para>This section describes how to monitor if any processes are changing the attributes of a targeted file, in real time. </para>
<formalpara id="inodewatch2">
<title>inodewatch2.stp</title>
<para>
<programlisting><xi:include parse="text" href="../testsuite/systemtap.examples/io/inodewatch2.stp" xmlns:xi="http://www.w3.org/2001/XInclude" /></programlisting>
</para>
</formalpara>
<para>Like <xref linkend="inodewatch"/> from <xref linkend="inodewatchsect"/>, <xref linkend="inodewatch2"/> takes the targeted file's device number (in integer format) and <command>inode</command> number as arguments. For more information on how to retrieve this information, refer to <xref linkend="inodewatchsect"/>.</para>
<para>The output for <xref linkend="inodewatch2"/> is similar to that of <xref linkend="inodewatch"/>, except that <xref linkend="inodewatch2"/> also contains the attribute changes to the monitored file, as well as the ID of the user responsible (<command>uid()</command>). <xref linkend="inodewatch2output"/> shows the output of <xref linkend="inodewatch2"/> while monitoring <filename>/home/joe/bigfile</filename> when user <computeroutput>joe</computeroutput> executes <command>chmod 777 /home/joe/bigfile</command> and <command>chmod 666 /home/joe/bigfile</command>.</para>
<example id="inodewatch2output">
<title><xref linkend="inodewatch2"/> Sample Output</title>
<screen>chmod(17448) inode_setattr 0x800005/6011835 100777 500
chmod(17449) inode_setattr 0x800005/6011835 100666 500</screen>
</example>
<!--
global ATTR_MODE = 1
probe kernel.function("inode_setattr") {
dev_nr = $inode->i_sb->s_dev
inode_nr = $inode->i_ino
if (dev_nr == ($1 << 20 | $2) # major/minor device
&& inode_nr == $3
&& $attr->ia_valid & ATTR_MODE)
printf ("%s(%d) %s 0x%x/%u %o %d\n",
execname(), pid(), probefunc(), dev_nr, inode_nr, $attr->ia_mode, uid())
}
-->
</section>
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