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Frans Kaashoek 2019-07-24 14:26:05 -04:00
parent 711bd3156d
commit 5d75346e4a
1 changed files with 11 additions and 3 deletions
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labs/xv6.html
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@ -82,8 +82,8 @@ initial file system. You just ran one of them: <tt>ls</tt>.
<h2>sleep</h2> <h2>sleep</h2>
<p>Write a program that sleeps for a user-specified number of seconds, <p>Implement the UNIX program sleep, which sleeps for a user-specified
compile it, and run it. number of ticks.
<p>Some hints: <p>Some hints:
<ul> <ul>
@ -94,7 +94,7 @@ initial file system. You just ran one of them: <tt>ls</tt>.
<li>The argument is passed as a string; you can convert it to an <li>The argument is passed as a string; you can convert it to an
integer using <tt>atoi</tt> (see user/ulib.c). integer using <tt>atoi</tt> (see user/ulib.c).
<li>Use the system call <tt>sleep</tt> (see user/usys.S). <li>Use the system call <tt>sleep</tt> (see user/usys.S and kernel/sysproc.c).
<li>Make sure <tt>main</tt> calls <tt>exit()</tt> in order to exit <li>Make sure <tt>main</tt> calls <tt>exit()</tt> in order to exit
your program. your program.
@ -143,6 +143,14 @@ initial file system. You just ran one of them: <tt>ls</tt>.
<h2>find</h2> <h2>find</h2>
<p>Write a simple version of the UNIX find program: find all the files
in a directory tree that contain a user-specified string.
<p>Some hints:
<ul>
<li>Look at user/ls.c to see how to read directories.
</ul>
<h2>Optional: modify shell</h2> <h2>Optional: modify shell</h2>
<p>Modify the shell to support lists of commands, separated by ";" <p>Modify the shell to support lists of commands, separated by ";"