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lua-posix 36.3-2
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<h1>luaposix 36.3</h1>


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  <li><a href="../index.html">Index</a></li>
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<h2>Examples</h2>
<ul class="nowrap">
  <li><a href="../examples/abstract-ns-client.lua.html">abstract-ns-client.lua</a></li>
  <li><a href="../examples/abstract-ns-server.lua.html">abstract-ns-server.lua</a></li>
  <li><a href="../examples/dir.lua.html">dir.lua</a></li>
  <li><a href="../examples/dup2.lua.html">dup2.lua</a></li>
  <li><strong>fork.lua</strong></li>
  <li><a href="../examples/fork2.lua.html">fork2.lua</a></li>
  <li><a href="../examples/getopt.lua.html">getopt.lua</a></li>
  <li><a href="../examples/glob.lua.html">glob.lua</a></li>
  <li><a href="../examples/limit.lua.html">limit.lua</a></li>
  <li><a href="../examples/lock.lua.html">lock.lua</a></li>
  <li><a href="../examples/netlink-uevent.lua.html">netlink-uevent.lua</a></li>
  <li><a href="../examples/packet-socket.lua.html">packet-socket.lua</a></li>
  <li><a href="../examples/ping.lua.html">ping.lua</a></li>
  <li><a href="../examples/poll.lua.html">poll.lua</a></li>
  <li><a href="../examples/rt_sched.lua.html">rt_sched.lua</a></li>
  <li><a href="../examples/signal.lua.html">signal.lua</a></li>
  <li><a href="../examples/socket.lua.html">socket.lua</a></li>
  <li><a href="../examples/termios.lua.html">termios.lua</a></li>
  <li><a href="../examples/tree.lua.html">tree.lua</a></li>
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<h2>Modules</h2>
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    <h2>fork.lua</h2>
<pre>
#! /usr/bin/env lua

<span class="keyword">local</span> M = <span class="global">require</span> <span class="string">'posix.unistd'</span>


<span class="keyword">local</span> r,w = M.<span class="function-name">pipe</span>()
<span class="keyword">local</span> childpid = M.<span class="function-name">fork</span>()
<span class="keyword">if</span> childpid == <span class="number">0</span> <span class="keyword">then</span>
   <span class="comment">-- child reads from pipe
</span>   M.<span class="function-name">close</span>(w)  <span class="comment">-- close unused write end
</span>
   <span class="keyword">local</span> b = M.<span class="function-name">read</span>(r, <span class="number">1</span>)
   <span class="keyword">while</span> #b == <span class="number">1</span> <span class="keyword">do</span>
      <span class="comment">-- got a byte from the pipe, write it to stdout
</span>      <span class="global">io</span>.<span class="function-name">write</span>(b)
      b = M.<span class="function-name">read</span>(r, <span class="number">1</span>)
   <span class="keyword">end</span>
   M.<span class="function-name">close</span>(r)
   M.<span class="function-name">_exit</span>(<span class="number">0</span>)

<span class="keyword">else</span>
   <span class="comment">-- parent writes to pipe
</span>   M.<span class="function-name">close</span>(r) <span class="comment">-- close unused read end
</span>
   <span class="comment">-- write the bytes for the child process to the pipe
</span>   M.<span class="function-name">write</span>(w,<span class="string">'hello dolly\n'</span>)
   M.<span class="function-name">close</span>(w)
   <span class="comment">-- wait for child to finish
</span>   <span class="global">require</span> <span class="string">'posix.sys.wait'</span>.<span class="function-name">wait</span>(childpid)
<span class="keyword">end</span></pre>


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