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<title>dumpsfs</title>
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<h2 align=center>dumpsfs</h2>
<h4 align=center>OS/161 Reference Manual</h4>

<h3>Name</h3>
<p>
dumpsfs - dump information about an SFS filesystem
</p>

<h3>Synopsis</h3>
<p>
<tt>/sbin/dumpsfs</tt> <em>raw-device</em><br>
<tt>host-dumpsfs</tt> <em>disk-image-file</em>
</p>

<h3>Description</h3>
<p>
<tt>dumpsfs</tt> dumps out selected information regarding the contents
and structure of the SFS filesystem on the device it is passed.
<p>

<p>
Like <A HREF=mksfs.html>mksfs</A>, it is also compiled for the
System/161 host OS, and in that form can access System/161's disk
image files.
</p>

<h3>Requirements</h3>
<p>
<tt>dumpsfs</tt> uses the following system calls:
<ul>
<li> <A HREF=../syscall/open.html>open</A>
<li> <A HREF=../syscall/read.html>read</A>
<li> <A HREF=../syscall/write.html>write</A>
<li> <A HREF=../syscall/lseek.html>lseek</A>
<li> <A HREF=../syscall/fstat.html>fstat</A>
<li> <A HREF=../syscall/close.html>close</A>
<li> <A HREF=../syscall/_exit.html>_exit</A>
</ul>
</p>

<p>
Since the fstat system call is not normally part of the basic system
calls assignment, <tt>dumpsfs</tt> will usually still not function
after that assignment is completed.
The fstat call is typically part of a later assignment, usually the
file system assignment.
Consult your course materials for specific information.
</p>

<p>
The host version of <tt>dumpsfs</tt>, since it runs outside of OS/161,
should always work regardless of what you have and have not
implemented.
</p>

<p>
Note that you may wish to extend dumpsfs in the course of doing the
file system assignment.
</p>

<h3>See Also</h3>
<p>
<A HREF=mksfs.html>mksfs</A>,
<A HREF=sfsck.html>sfsck</A>
</p>

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