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syscall lab nits

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Robert Morris 2019-08-02 11:55:26 -04:00
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@ -82,16 +82,16 @@ initial file system. You just ran one of them: <tt>ls</tt>.
<h2>sleep</h2>
<p>Implement the UNIX program sleep, which sleeps for a user-specified
number of ticks.
<p>Implement the UNIX program sleep for xv6; your sleep should pause
for a user-specified number of ticks.
<p>Some hints:
<ul>
<li>Look at some of the other programs in <tt>user/</tt> to see
how you can obtain the arguments passed to a program. If the user
how you can obtain the command-line arguments passed to a program. If the user
forgets to pass an argument, sleep should print an error message.
<li>The argument is passed as a string; you can convert it to an
<li>The command-line argument is passed as a string; you can convert it to an
integer using <tt>atoi</tt> (see user/ulib.c).
<li>Use the system call <tt>sleep</tt> (see user/usys.S and kernel/sysproc.c).