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Fix and clarity 'kill' documentation

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3328 42af7a65-404d-4744-a932-0658087f49c3
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patacongo 2011-03-02 00:47:12 +00:00
parent fefe839818
commit 998f4e2dea
1 changed files with 27 additions and 2 deletions
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Documentation/NuttShell.html
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@ -8,7 +8,7 @@
<tr align="center" bgcolor="#e4e4e4">
<td>
<h1><big><font color="#3c34ec"><i>NuttShell (NSH)</i></font></big></h1>
<p>Last Updated: February 28, 2011</p>
<p>Last Updated: March 1, 2011</p>
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@ -1006,8 +1006,33 @@ kill -&lt;signal&gt; &lt;pid&gt;
</pre></ul>
<p>
<b>Synopsis</b>.
Send the <signal> to the task identified by <pid>.
Send the &lt;signal&gt; to the task identified by &lt;pid&gt;.
</p>
<ul><pre>
nsh&gt; mkfifo /dev/fifo
nsh&gt; cat /dev/fifo &
cat [2:128]
nsh&gt; ps
PID PRI SCHD TYPE NP STATE NAME
0 0 FIFO TASK READY Idle Task()
1 128 FIFO TASK RUNNING init()
2 128 FIFO PTHREAD WAITSEM <pthread>(51ea50)
nsh&gt; kill -9 2
nsh: cat: open failed: 4
nsh&gt; ps
PID PRI SCHD TYPE NP STATE NAME
0 0 FIFO TASK READY Idle Task()
1 128 FIFO TASK RUNNING init()
nsh&gt;
</pre></ul>
<p><small>
<b>NOTE</b>:
NuttX does not support a FULL POSIX signalling system.
Standard signals like SIGCHLD, SIGINTR, SIGKILL, etc. do not exist in NuttX and sending those signal may not have the result that you expect.
Rather, NuttX supports only what are referred to as POSIX real-time signals.
These signals may be used to communicate with running tasks, may be use to waiting waiting tasks, etc.
But, as an example, <code>kill -9</code> (SIGKILL) will not terminate a task.
</p></small>
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