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<h1>luaposix 33.3.0</h1>
<ul>
<li><a href="../index.html">Index</a></li>
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<h2>Examples</h2>
<ul class="$(kind=='Topics' and '' or 'nowrap'">
<li><a href="../examples/curses.lua.html">curses.lua</a></li>
<li><a href="../examples/dir.lua.html">dir.lua</a></li>
<li><a href="../examples/fork.lua.html">fork.lua</a></li>
<li><a href="../examples/fork2.lua.html">fork2.lua</a></li>
<li><a href="../examples/getopt.lua.html">getopt.lua</a></li>
<li><a href="../examples/glob.lua.html">glob.lua</a></li>
<li><a href="../examples/limit.lua.html">limit.lua</a></li>
<li><a href="../examples/lock.lua.html">lock.lua</a></li>
<li><a href="../examples/netlink-uevent.lua.html">netlink-uevent.lua</a></li>
<li><strong>ping.lua</strong></li>
<li><a href="../examples/poll.lua.html">poll.lua</a></li>
<li><a href="../examples/rt_sched.lua.html">rt_sched.lua</a></li>
<li><a href="../examples/signal.lua.html">signal.lua</a></li>
<li><a href="../examples/socket.lua.html">socket.lua</a></li>
<li><a href="../examples/termios.lua.html">termios.lua</a></li>
<li><a href="../examples/tree.lua.html">tree.lua</a></li>
</ul>
<h2>Modules</h2>
<ul class="$(kind=='Topics' and '' or 'nowrap'">
<li><a href="../modules/posix.html">posix</a></li>
<li><a href="../modules/posix.ctype.html">posix.ctype</a></li>
<li><a href="../modules/posix.curses.html">posix.curses</a></li>
<li><a href="../modules/posix.dirent.html">posix.dirent</a></li>
<li><a href="../modules/posix.errno.html">posix.errno</a></li>
<li><a href="../modules/posix.fcntl.html">posix.fcntl</a></li>
<li><a href="../modules/posix.fnmatch.html">posix.fnmatch</a></li>
<li><a href="../modules/posix.getopt.html">posix.getopt</a></li>
<li><a href="../modules/posix.glob.html">posix.glob</a></li>
<li><a href="../modules/posix.grp.html">posix.grp</a></li>
<li><a href="../modules/posix.libgen.html">posix.libgen</a></li>
<li><a href="../modules/posix.poll.html">posix.poll</a></li>
<li><a href="../modules/posix.pwd.html">posix.pwd</a></li>
<li><a href="../modules/posix.sched.html">posix.sched</a></li>
<li><a href="../modules/posix.signal.html">posix.signal</a></li>
<li><a href="../modules/posix.stdio.html">posix.stdio</a></li>
<li><a href="../modules/posix.stdlib.html">posix.stdlib</a></li>
<li><a href="../modules/posix.sys.msg.html">posix.sys.msg</a></li>
<li><a href="../modules/posix.sys.resource.html">posix.sys.resource</a></li>
<li><a href="../modules/posix.sys.socket.html">posix.sys.socket</a></li>
<li><a href="../modules/posix.sys.stat.html">posix.sys.stat</a></li>
<li><a href="../modules/posix.sys.statvfs.html">posix.sys.statvfs</a></li>
<li><a href="../modules/posix.sys.time.html">posix.sys.time</a></li>
<li><a href="../modules/posix.sys.times.html">posix.sys.times</a></li>
<li><a href="../modules/posix.sys.utsname.html">posix.sys.utsname</a></li>
<li><a href="../modules/posix.sys.wait.html">posix.sys.wait</a></li>
<li><a href="../modules/posix.syslog.html">posix.syslog</a></li>
<li><a href="../modules/posix.termio.html">posix.termio</a></li>
<li><a href="../modules/posix.time.html">posix.time</a></li>
<li><a href="../modules/posix.unistd.html">posix.unistd</a></li>
<li><a href="../modules/posix.utime.html">posix.utime</a></li>
</ul>
<h2>Classes</h2>
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<li><a href="../classes/posix.curses.chstr.html">posix.curses.chstr</a></li>
<li><a href="../classes/posix.curses.window.html">posix.curses.window</a></li>
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<h2>ping.lua</h2>
<pre>
<span class="keyword">local</span> p = <span class="global">require</span> <span class="string">"posix"</span>
<span class="keyword">if</span> p.SOCK_RAW <span class="keyword">and</span> p.SO_BINDTODEVICE <span class="keyword">then</span>
<span class="comment">-- Open raw socket
</span>
<span class="keyword">local</span> fd, err = p.socket(p.AF_INET, p.SOCK_RAW, p.IPPROTO_ICMP)
<span class="global">assert</span>(fd, err)
<span class="comment">-- Optionally, bind to specific device
</span>
<span class="keyword">local</span> ok, err = p.setsockopt(fd, p.SOL_SOCKET, p.SO_BINDTODEVICE, <span class="string">"wlan0"</span>)
<span class="global">assert</span>(ok, err)
<span class="comment">-- Create raw ICMP echo (ping) message
</span>
<span class="keyword">local</span> data = <span class="global">string</span>.char(<span class="number">0x08</span>, <span class="number">0x00</span>, <span class="number">0x89</span>, <span class="number">0x98</span>, <span class="number">0x6e</span>, <span class="number">0x63</span>, <span class="number">0x00</span>, <span class="number">0x04</span>, <span class="number">0x00</span>)
<span class="comment">-- Send message
</span>
<span class="keyword">local</span> ok, err = p.sendto(fd, data, { family = p.AF_INET, addr = <span class="string">"8.8.8.8"</span>, port = <span class="number">0</span> })
<span class="global">assert</span>(ok, err)
<span class="comment">-- Read reply
</span>
<span class="keyword">local</span> data, sa = p.recvfrom(fd, <span class="number">1024</span>)
<span class="global">assert</span>(data, sa)
<span class="keyword">if</span> data <span class="keyword">then</span>
<span class="global">print</span>(<span class="string">"Received ICMP message from "</span> .. sa.addr)
<span class="keyword">end</span>
<span class="keyword">end</span></pre>
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