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POHow to kill process in c++, knowing only part of its name
 

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  1. POHow to kill process in c++, knowing only part of its name
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    <p>Some time ago I needed to write c++ code to kill some process. In my main program I run large CAE-system package with system("...") with different filename strings on input. CAE-software creates many processes, that contain in process name string <em>filename</em>). Some of the CAE-processes <em>worktime</em> > <em>max_time</em>, than I need to shut them down:</p> <pre><code>//filename contains part of CAE-process name string s="/bin/kill -9 `ps aux | grep "+filename+" | awk {'print $2'}`"; system(s.c_str()); </code></pre> <p>The output was:</p> <pre><code>Usage: kill pid ... Send SIGTERM to every process listed. kill signal pid ... Send a signal to every process listed. kill -s signal pid ... Send a signal to every process listed. kill -l List all signal names. kill -L List all signal names in a nice table. kill -l signal Convert between signal numbers and names. </code></pre> <p>I tried to run with execvp, tried <a href="https://stackoverflow.com/a/9402442/1566267">different ways running kill or pkill over bash script</a>, calling system("name_of_script.sh"), where script contained <code>kill -9 *filename*</code> but the result was the same.<br> Using <code>kill</code> and <code>/bin/kill</code> gave the same output, <code>bash -c kill...</code> too.<br> Using <strong><code>kill</code> from my system</strong> (Ubuntu Natty) <strong>gnome-terminal</strong>: </p> <pre><code>kill -9 `ps aux | grep filename | awk {'print $2'}` </code></pre> <p>shutdown all necessary processes! It <strong>works</strong>.</p> <p>When using <code>pkill</code>, as I could understand, we need full process name to kill it, but I have only part of name.</p> <p>I also tried to wrap computational process into a child thread using pthreads and stop it with pthread_cancel, but it doesn't work because of CAE-system process doesn't receive signals (I think, trapping them), the only way is SIGTERM.<br> Killing child-thread-"wrap" with pthread_kill also kills the parent (my main program).</p> <p>I don't know CAE-process pids to call <a href="http://linux.die.net/man/2/kill" rel="nofollow noreferrer">kill from signals.h</a><br> Closing main program do not stop CAE-processes (and the do not have -Z flag, so are they aren't my program process childs??)</p> <p>How can I close CAE-processes, that run > MAXTIME from my main program?</p> <hr> <p><strong><em>The problem was that I was running main program via debugger (gdb) in QtCreator. Without QtCreator shell-script runs with arguments the right way, though arguments are passed correctly both ways.</em></strong></p> <hr> <p>Also I have to clear some CAE processes, that don't have filename in cmdline, but that are parents or children of this process. In shell-script you can use:</p> <pre><code>cat /proc/"$P"/status | grep PPid | grep -o "[0-9]*" </code></pre> <p>where <code>$P</code> is a variable with pid of killed process. <a href="https://stackoverflow.com/questions/7138783/how-to-display-the-current-process-tree-of-a-bash-session">Here are several methods</a> to kill all child processes.</p> <p>I'll write smth. similar in C++ that will scan <code>/proc/xxxx/status</code> till <code>PPid</code>= ppid_of_my main_program and cut that branch.</p>
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    1. COAre these processes ones that you're creating from your program? It would be much easier to remember the pid and kill them that way.
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    2. COAre you sure you really want to do this in C++ instead of shell?
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    3. COI call CAE with system("launcher.sh filename"); Filename differs each time. Oh, I can only take launcher's pid, that finishes in two seconds and creates CAE processes.
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