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<h1>Source code for logfs.fstracer</h1><div class="highlight"><pre>
<span class="c">#!/usr/bin/env python2</span>
<span class="sd">"""</span>
<span class="sd">This module is a bridge between low-level logging services and high level </span>
<span class="sd">handling dependency logic.</span>
<span class="sd">It can be used to launch a program and get all file events</span>
<span class="sd">"""</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">import</span> <span class="nn">stat</span>
<span class="kn">import</span> <span class="nn">time</span>
<span class="kn">import</span> <span class="nn">tempfile</span>
<span class="kn">import</span> <span class="nn">socket</span>
<span class="kn">import</span> <span class="nn">select</span>
<span class="kn">import</span> <span class="nn">re</span>
<span class="kn">import</span> <span class="nn">signal</span>
<span class="kn">import</span> <span class="nn">logger_hooklib</span>
<span class="kn">import</span> <span class="nn">logger_fusefs</span>
<span class="n">stop</span><span class="o">=</span><span class="bp">False</span><span class="p">;</span>
<span class="n">stoptime</span><span class="o">=</span><span class="mi">0</span><span class="p">;</span>
<span class="k">def</span> <span class="nf">parse_message</span><span class="p">(</span><span class="n">message</span><span class="p">):</span>
<span class="n">ret</span><span class="o">=</span><span class="n">message</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s">"</span><span class="se">\0</span><span class="s">"</span><span class="p">)</span>
<span class="k">return</span> <span class="n">ret</span>
<span class="c">#check if process is zombie</span>
<span class="k">def</span> <span class="nf">iszombie</span><span class="p">(</span><span class="n">pid</span><span class="p">):</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">statfile</span><span class="o">=</span><span class="nb">open</span><span class="p">(</span><span class="s">"/proc/</span><span class="si">%d</span><span class="s">/stat"</span> <span class="o">%</span> <span class="n">pid</span><span class="p">,</span><span class="s">"r"</span><span class="p">)</span>
<span class="n">line</span><span class="o">=</span><span class="n">statfile</span><span class="o">.</span><span class="n">readline</span><span class="p">()</span>
<span class="n">statfile</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="n">line</span><span class="o">=</span><span class="n">line</span><span class="o">.</span><span class="n">rsplit</span><span class="p">(</span><span class="s">")"</span><span class="p">)[</span><span class="mi">1</span><span class="p">]</span> <span class="c"># find last ")" char</span>
<span class="n">line</span><span class="o">=</span><span class="n">line</span><span class="o">.</span><span class="n">strip</span><span class="p">()</span>
<span class="n">match</span><span class="o">=</span><span class="n">re</span><span class="o">.</span><span class="n">match</span><span class="p">(</span><span class="s">r"^(\w)"</span><span class="p">,</span><span class="n">line</span><span class="p">)</span>
<span class="k">if</span> <span class="n">match</span><span class="o">==</span><span class="bp">None</span><span class="p">:</span>
<span class="k">print</span> <span class="s">"Failed to get check if process is zombie. Format of /proc/<pid>/stat is incorrect. Did you change a kernel?"</span>
<span class="k">return</span> <span class="bp">False</span>
<span class="k">return</span> <span class="n">match</span><span class="o">.</span><span class="n">group</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span><span class="o">==</span><span class="s">"Z"</span>
<span class="k">except</span> <span class="ne">IOError</span><span class="p">,</span><span class="n">e</span><span class="p">:</span>
<span class="k">return</span> <span class="bp">True</span>
<span class="c"># default access filter. Allow acess to all files</span>
<span class="k">def</span> <span class="nf">defaultfilter</span><span class="p">(</span><span class="n">eventname</span><span class="p">,</span> <span class="n">filename</span><span class="p">,</span> <span class="n">stage</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">True</span>
<div class="viewcode-block" id="getfsevents"><a class="viewcode-back" href="../../api.html#logfs.fstracer.getfsevents">[docs]</a><span class="k">def</span> <span class="nf">getfsevents</span><span class="p">(</span><span class="n">prog_name</span><span class="p">,</span><span class="n">arguments</span><span class="p">,</span><span class="n">approach</span><span class="o">=</span><span class="s">"hooklib"</span><span class="p">,</span><span class="n">filterproc</span><span class="o">=</span><span class="n">defaultfilter</span><span class="p">):</span>
<span class="sd">""" </span>
<span class="sd"> Launches a program and gets file access events</span>
<span class="sd"> :param prog_name: name of program</span>
<span class="sd"> :param arguments: list of program's arguments</span>
<span class="sd"> :param approach: a logging approach('hooklib' or 'fusefs')</span>
<span class="sd"> :param filterproc: filter function, this function should take 3 strings:</span>
<span class="sd"> name of event, name of file and stage, and return a *True* if event is </span>
<span class="sd"> allowed and *False* instead. Name of event is one of *'open'*, *'read'* or</span>
<span class="sd"> *'write'*. Default function always returns *True*. </span>
<span class="sd"> :returns: **list** with two elements - *success* events and *failed* events.</span>
<span class="sd"> Each element is dictionary **stage->file information**.</span>
<span class="sd"> File information is also a dictionary **filename->type of events**.</span>
<span class="sd"> Type of events for success events is a 2-element tuple: *(was file readed,</span>
<span class="sd"> was file writed)*. For failed events it is also 2-element tuple:</span>
<span class="sd"> *(was file not found, was file blocked by filterproc)*. Each element of </span>
<span class="sd"> tuple can be *True* or *False*. Both elements of tuple can be *False*.</span>
<span class="sd"> Stage can be *'unknown'*</span>
<span class="sd"> """</span>
<span class="n">events</span><span class="o">=</span><span class="p">{}</span>
<span class="c"># generate a random socketname</span>
<span class="n">tmpdir</span> <span class="o">=</span> <span class="n">tempfile</span><span class="o">.</span><span class="n">mkdtemp</span><span class="p">()</span>
<span class="n">socketname</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">tmpdir</span><span class="p">,</span> <span class="s">'socket'</span><span class="p">)</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">sock_listen</span><span class="o">=</span><span class="n">socket</span><span class="o">.</span><span class="n">socket</span><span class="p">(</span><span class="n">socket</span><span class="o">.</span><span class="n">AF_UNIX</span><span class="p">,</span> <span class="n">socket</span><span class="o">.</span><span class="n">SOCK_SEQPACKET</span><span class="p">)</span>
<span class="n">sock_listen</span><span class="o">.</span><span class="n">setsockopt</span><span class="p">(</span><span class="n">socket</span><span class="o">.</span><span class="n">SOL_SOCKET</span><span class="p">,</span> <span class="n">socket</span><span class="o">.</span><span class="n">SO_REUSEADDR</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="n">sock_listen</span><span class="o">.</span><span class="n">bind</span><span class="p">(</span><span class="n">socketname</span><span class="p">)</span>
<span class="n">sock_listen</span><span class="o">.</span><span class="n">listen</span><span class="p">(</span><span class="mi">64</span><span class="p">)</span>
<span class="c"># enable connect a socket for anyone</span>
<span class="n">os</span><span class="o">.</span><span class="n">chmod</span><span class="p">(</span><span class="n">tmpdir</span><span class="p">,</span><span class="n">stat</span><span class="o">.</span><span class="n">S_IRUSR</span><span class="o">|</span><span class="n">stat</span><span class="o">.</span><span class="n">S_IWUSR</span><span class="o">|</span><span class="n">stat</span><span class="o">.</span><span class="n">S_IXUSR</span><span class="o">|</span><span class="n">stat</span><span class="o">.</span><span class="n">S_IROTH</span><span class="o">|</span><span class="n">stat</span><span class="o">.</span><span class="n">S_IWOTH</span><span class="o">|</span><span class="n">stat</span><span class="o">.</span><span class="n">S_IXOTH</span><span class="p">)</span>
<span class="n">os</span><span class="o">.</span><span class="n">chmod</span><span class="p">(</span><span class="n">socketname</span><span class="p">,</span><span class="n">stat</span><span class="o">.</span><span class="n">S_IRUSR</span><span class="o">|</span><span class="n">stat</span><span class="o">.</span><span class="n">S_IWUSR</span><span class="o">|</span><span class="n">stat</span><span class="o">.</span><span class="n">S_IXUSR</span><span class="o">|</span><span class="n">stat</span><span class="o">.</span><span class="n">S_IROTH</span><span class="o">|</span><span class="n">stat</span><span class="o">.</span><span class="n">S_IWOTH</span><span class="o">|</span><span class="n">stat</span><span class="o">.</span><span class="n">S_IXOTH</span><span class="p">)</span>
<span class="k">except</span> <span class="n">socket</span><span class="o">.</span><span class="n">error</span><span class="p">,</span> <span class="n">e</span><span class="p">:</span>
<span class="k">print</span> <span class="s">"Failed to create a socket for exchange data with the logger: </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="n">e</span>
<span class="k">return</span> <span class="p">[]</span>
<span class="k">else</span><span class="p">:</span>
<span class="c">#print socketname</span>
<span class="n">pid</span><span class="o">=</span><span class="n">os</span><span class="o">.</span><span class="n">fork</span><span class="p">()</span>
<span class="k">if</span> <span class="n">pid</span><span class="o">==</span><span class="mi">0</span><span class="p">:</span>
<span class="n">logger</span><span class="o">=</span><span class="bp">None</span>
<span class="k">if</span> <span class="n">approach</span><span class="o">==</span><span class="s">"hooklib"</span><span class="p">:</span>
<span class="n">logger</span><span class="o">=</span><span class="n">logger_hooklib</span><span class="o">.</span><span class="n">logger</span><span class="p">(</span><span class="n">socketname</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">approach</span><span class="o">==</span><span class="s">"fusefs"</span><span class="p">:</span>
<span class="n">logger</span><span class="o">=</span><span class="n">logger_fusefs</span><span class="o">.</span><span class="n">logger</span><span class="p">(</span><span class="n">socketname</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">print</span> <span class="s">"Unknown logging approach"</span>
<span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="n">logger</span><span class="o">.</span><span class="n">execprog</span><span class="p">(</span><span class="n">prog_name</span><span class="p">,</span><span class="n">arguments</span><span class="p">)</span>
<span class="c"># should not get here</span>
<span class="k">print</span> <span class="s">"Launch likely was unsuccessful"</span>
<span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">def</span> <span class="nf">signal_handler</span><span class="p">(</span><span class="n">sig</span><span class="p">,</span> <span class="n">frame</span><span class="p">):</span>
<span class="k">print</span> <span class="s">"You pressed Ctrl+C!"</span>
<span class="k">global</span> <span class="n">stoptime</span>
<span class="k">if</span><span class="p">(</span><span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span><span class="o">-</span><span class="n">stoptime</span><span class="o">></span><span class="mi">5</span><span class="p">):</span>
<span class="k">print</span> <span class="s">"Sending SIGINT to child"</span>
<span class="k">print</span> <span class="s">"Press again in 5 seconds to force exit"</span>
<span class="n">stoptime</span><span class="o">=</span><span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">print</span> <span class="s">"Sending SIGKILL to child"</span>
<span class="n">os</span><span class="o">.</span><span class="n">kill</span><span class="p">(</span><span class="n">pid</span><span class="p">,</span><span class="n">signal</span><span class="o">.</span><span class="n">SIGKILL</span><span class="p">)</span>
<span class="n">os</span><span class="o">.</span><span class="n">_exit</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span>
<span class="kn">import</span> <span class="nn">signal</span> <span class="c"># signal must to be in this scope</span>
<span class="c"># global signal not works</span>
<span class="n">signal</span><span class="o">.</span><span class="n">signal</span><span class="p">(</span><span class="n">signal</span><span class="o">.</span><span class="n">SIGINT</span><span class="p">,</span> <span class="n">signal_handler</span><span class="p">)</span>
<span class="n">epoll</span><span class="o">=</span><span class="n">select</span><span class="o">.</span><span class="n">epoll</span><span class="p">()</span>
<span class="n">epoll</span><span class="o">.</span><span class="n">register</span><span class="p">(</span><span class="n">sock_listen</span><span class="o">.</span><span class="n">fileno</span><span class="p">(),</span> <span class="n">select</span><span class="o">.</span><span class="n">EPOLLIN</span><span class="p">)</span>
<span class="n">connects</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
<span class="n">clients</span><span class="o">=</span><span class="p">{}</span>
<span class="n">was_first_connect</span><span class="o">=</span><span class="bp">False</span>
<span class="k">while</span> <span class="bp">True</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">sock_events</span> <span class="o">=</span> <span class="n">epoll</span><span class="o">.</span><span class="n">poll</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span>
<span class="k">for</span> <span class="n">fileno</span><span class="p">,</span> <span class="n">sock_event</span> <span class="ow">in</span> <span class="n">sock_events</span><span class="p">:</span>
<span class="k">if</span> <span class="n">fileno</span> <span class="o">==</span> <span class="n">sock_listen</span><span class="o">.</span><span class="n">fileno</span><span class="p">():</span>
<span class="c">#print "\n\nEVENT\n\n"</span>
<span class="n">ret</span> <span class="o">=</span> <span class="n">sock_listen</span><span class="o">.</span><span class="n">accept</span><span class="p">()</span>
<span class="c">#print ret</span>
<span class="k">if</span> <span class="n">ret</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="c"># print "\n\nPASS\n\n"</span>
<span class="k">pass</span>
<span class="k">else</span><span class="p">:</span>
<span class="p">(</span><span class="n">client</span><span class="p">,</span><span class="n">addr</span><span class="p">)</span><span class="o">=</span><span class="n">ret</span>
<span class="c"># print client</span>
<span class="n">connects</span><span class="o">+=</span><span class="mi">1</span><span class="p">;</span> <span class="c"># client accepted</span>
<span class="n">was_first_connect</span><span class="o">=</span><span class="bp">True</span>
<span class="n">epoll</span><span class="o">.</span><span class="n">register</span><span class="p">(</span><span class="n">client</span><span class="o">.</span><span class="n">fileno</span><span class="p">(),</span> <span class="n">select</span><span class="o">.</span><span class="n">EPOLLIN</span><span class="p">)</span>
<span class="n">clients</span><span class="p">[</span><span class="n">client</span><span class="o">.</span><span class="n">fileno</span><span class="p">()]</span><span class="o">=</span><span class="n">client</span>
<span class="c">#print "opened %d" % client.fileno()</span>
<span class="c">#elif sock_event & select.EPOLLHUP:</span>
<span class="c">#epoll.unregister(fileno)</span>
<span class="c">#clients[fileno].close()</span>
<span class="c">#del clients[fileno]</span>
<span class="c">#connects-=1</span>
<span class="k">elif</span> <span class="n">sock_event</span> <span class="o">&</span> <span class="n">select</span><span class="o">.</span><span class="n">EPOLLIN</span><span class="p">:</span>
<span class="n">s</span><span class="o">=</span><span class="n">clients</span><span class="p">[</span><span class="n">fileno</span><span class="p">]</span>
<span class="n">record</span><span class="o">=</span><span class="n">s</span><span class="o">.</span><span class="n">recv</span><span class="p">(</span><span class="mi">8192</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">record</span><span class="p">:</span> <span class="c"># if connection was closed</span>
<span class="n">epoll</span><span class="o">.</span><span class="n">unregister</span><span class="p">(</span><span class="n">fileno</span><span class="p">)</span>
<span class="n">clients</span><span class="p">[</span><span class="n">fileno</span><span class="p">]</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="k">del</span> <span class="n">clients</span><span class="p">[</span><span class="n">fileno</span><span class="p">]</span>
<span class="n">connects</span><span class="o">-=</span><span class="mi">1</span>
<span class="c">#print "closed %d"%fileno</span>
<span class="k">continue</span>
<span class="n">message</span><span class="o">=</span><span class="n">record</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s">"</span><span class="se">\0</span><span class="s">"</span><span class="p">)</span>
<span class="c">#if message[3]=="compile": #and message[1]=="debug":</span>
<span class="c">#print message</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">if</span> <span class="n">message</span><span class="p">[</span><span class="mi">4</span><span class="p">]</span><span class="o">==</span><span class="s">"ASKING"</span><span class="p">:</span>
<span class="k">if</span> <span class="n">filterproc</span><span class="p">(</span><span class="n">message</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span><span class="n">message</span><span class="p">[</span><span class="mi">2</span><span class="p">],</span><span class="n">message</span><span class="p">[</span><span class="mi">3</span><span class="p">]):</span>
<span class="c">#print "Allowing an access to %s" % message[2]</span>
<span class="n">s</span><span class="o">.</span><span class="n">sendall</span><span class="p">(</span><span class="s">"ALLOW</span><span class="se">\0</span><span class="s">"</span><span class="p">);</span> <span class="c"># TODO: think about flush here</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">print</span> <span class="s">"Blocking an access to </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="n">message</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span>
<span class="n">s</span><span class="o">.</span><span class="n">sendall</span><span class="p">(</span><span class="s">"DENY</span><span class="se">\0</span><span class="s">"</span><span class="p">);</span> <span class="c"># TODO: think about flush here</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">eventname</span><span class="p">,</span><span class="n">filename</span><span class="p">,</span><span class="n">stage</span><span class="p">,</span><span class="n">result</span><span class="o">=</span><span class="n">message</span><span class="p">[</span><span class="mi">1</span><span class="p">:</span><span class="mi">5</span><span class="p">]</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">stage</span> <span class="ow">in</span> <span class="n">events</span><span class="p">:</span>
<span class="n">events</span><span class="p">[</span><span class="n">stage</span><span class="p">]</span><span class="o">=</span><span class="p">[{},{}]</span>
<span class="n">hashofsucesses</span><span class="o">=</span><span class="n">events</span><span class="p">[</span><span class="n">stage</span><span class="p">][</span><span class="mi">0</span><span class="p">]</span>
<span class="n">hashoffailures</span><span class="o">=</span><span class="n">events</span><span class="p">[</span><span class="n">stage</span><span class="p">][</span><span class="mi">1</span><span class="p">]</span>
<span class="k">if</span> <span class="n">result</span><span class="o">==</span><span class="s">"OK"</span><span class="p">:</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">filename</span> <span class="ow">in</span> <span class="n">hashofsucesses</span><span class="p">:</span>
<span class="n">hashofsucesses</span><span class="p">[</span><span class="n">filename</span><span class="p">]</span><span class="o">=</span><span class="p">[</span><span class="bp">False</span><span class="p">,</span><span class="bp">False</span><span class="p">]</span>
<span class="n">readed_or_writed</span><span class="o">=</span><span class="n">hashofsucesses</span><span class="p">[</span><span class="n">filename</span><span class="p">]</span>
<span class="k">if</span> <span class="n">eventname</span><span class="o">==</span><span class="s">"read"</span><span class="p">:</span>
<span class="n">readed_or_writed</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">=</span><span class="bp">True</span>
<span class="k">elif</span> <span class="n">eventname</span><span class="o">==</span><span class="s">"write"</span><span class="p">:</span>
<span class="n">readed_or_writed</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">=</span><span class="bp">True</span>
<span class="k">elif</span> <span class="n">result</span><span class="p">[</span><span class="mi">0</span><span class="p">:</span><span class="mi">3</span><span class="p">]</span><span class="o">==</span><span class="s">"ERR"</span> <span class="ow">or</span> <span class="n">result</span><span class="o">==</span><span class="s">"DENIED"</span><span class="p">:</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">filename</span> <span class="ow">in</span> <span class="n">hashoffailures</span><span class="p">:</span>
<span class="n">hashoffailures</span><span class="p">[</span><span class="n">filename</span><span class="p">]</span><span class="o">=</span><span class="p">[</span><span class="bp">False</span><span class="p">,</span><span class="bp">False</span><span class="p">]</span>
<span class="n">notfound_or_blocked</span><span class="o">=</span><span class="n">hashoffailures</span><span class="p">[</span><span class="n">filename</span><span class="p">]</span>
<span class="k">if</span> <span class="n">result</span><span class="o">==</span><span class="s">"ERR/2"</span><span class="p">:</span>
<span class="n">notfound_or_blocked</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">=</span><span class="bp">True</span>
<span class="k">elif</span> <span class="n">result</span><span class="o">==</span><span class="s">"DENIED"</span><span class="p">:</span>
<span class="n">notfound_or_blocked</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">=</span><span class="bp">True</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">print</span> <span class="s">"Error in logger module<->analyser protocol"</span>
<span class="k">except</span> <span class="ne">IndexError</span><span class="p">:</span>
<span class="k">print</span> <span class="s">"IndexError while parsing </span><span class="si">%s</span><span class="s">"</span><span class="o">%</span><span class="n">record</span>
<span class="k">except</span> <span class="ne">IOError</span><span class="p">,</span> <span class="n">e</span><span class="p">:</span>
<span class="k">if</span> <span class="n">e</span><span class="o">.</span><span class="n">errno</span><span class="o">!=</span><span class="mi">4</span><span class="p">:</span> <span class="c"># handling "Interrupted system call" errors</span>
<span class="k">raise</span>
<span class="k">if</span> <span class="n">was_first_connect</span> <span class="ow">and</span> <span class="n">connects</span><span class="o">==</span><span class="mi">0</span><span class="p">:</span>
<span class="k">break</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">sock_events</span><span class="p">)</span><span class="o">==</span><span class="mi">0</span> <span class="ow">and</span> <span class="nb">len</span><span class="p">(</span><span class="n">clients</span><span class="p">)</span><span class="o">==</span><span class="mi">0</span><span class="p">:</span>
<span class="c"># # seems like there is no connect</span>
<span class="k">print</span> <span class="s">"It seems like a logger module was unable to start or failed to finish</span><span class="se">\n</span><span class="s">"</span> <span class="o">+</span> \
<span class="s">"Check that you are not launching a suid program under non-root user."</span>
<span class="k">return</span> <span class="p">[]</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">clients</span><span class="p">)</span><span class="o">==</span><span class="mi">0</span> <span class="ow">and</span> <span class="n">iszombie</span><span class="p">(</span><span class="n">pid</span><span class="p">):</span>
<span class="k">break</span>
<span class="n">epoll</span><span class="o">.</span><span class="n">unregister</span><span class="p">(</span><span class="n">sock_listen</span><span class="o">.</span><span class="n">fileno</span><span class="p">())</span>
<span class="n">epoll</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="n">sock_listen</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="n">_</span><span class="p">,</span> <span class="n">exit_status</span><span class="o">=</span><span class="n">os</span><span class="o">.</span><span class="n">waitpid</span><span class="p">(</span><span class="n">pid</span><span class="p">,</span><span class="mi">0</span><span class="p">)</span>
<span class="n">signal</span><span class="p">,</span><span class="n">exit_status</span><span class="o">=</span><span class="n">exit_status</span><span class="o">%</span><span class="mi">256</span><span class="p">,</span><span class="n">exit_status</span><span class="o">/</span><span class="mi">256</span>
<span class="k">print</span> <span class="s">"Signal: </span><span class="si">%s</span><span class="s"> Exit status: </span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">signal</span><span class="p">,</span><span class="n">exit_status</span><span class="p">)</span>
<span class="k">return</span> <span class="n">events</span>
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