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Re: [PBML] Re: Perl forking acting wierd

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  • James Washer
    Perhaps it s time to use the perl debugger
    Message 1 of 8 , Jan 27, 2010
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      Perhaps it's time to use the perl debugger

      On Wed, 2010-01-27 at 19:21 +0530, Shameem Ahamed wrote:
      > Hello James.
      >
      > How i know ?. Because in the Slow query kill function, i am killing all the slow queries. and it is not happening. I can see the child process running , when i try ps.
      >
      > But it is not doing the tasks. I am really confused.
      >
      >
      > Shammi
      >
      >
      >
      > --- On Wed, 1/27/10, James Washer <washergrp@...> wrote:
      >
      > From: James Washer <washergrp@...>
      > Subject: Re: [PBML] Perl forking acting wierd
      > To: perl-beginner@yahoogroups.com
      > Date: Wednesday, January 27, 2010, 1:43 PM
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      > Once again.. HOW DO YOU KNOW IT IS NOT GETTING EXECUTED?
      >
      > Sorry for the caps, but it's been a trial getting information from you.
      >
      > I still don't know how you know it's not getting executed.. but, just
      >
      > for kicks.. put a die in your sub and see if it dies.
      >
      >
      >
      > - jim
      >
      >
      >
      > On Wed, 2010-01-27 at 13:19 +0530, Shameem Ahamed wrote:
      >
      > > As you can see in the code, i am calling the function Slow_Query_Kill in the child process.
      >
      > >
      >
      > > This function is not getting executed.
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      > >
      >
      > > My logic is, create a child process, exit the parent, make child the session leader and run the function Sleep_Query_ Kill in the child indefinitely.
      >
      > >
      >
      > >
      >
      > > Regards,
      >
      > > Shameem
      >
      > >
      >
      > > --- On Wed, 1/27/10, James Washer <washergrp@trlp. com> wrote:
      >
      > >
      >
      > > From: James Washer <washergrp@trlp. com>
      >
      > > Subject: Re: [PBML] Perl forking acting wierd
      >
      > > To: perl-beginner@ yahoogroups. com
      >
      > > Date: Wednesday, January 27, 2010, 2:19 AM
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      > >
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      > > And what did the problem do to lead you to think that it couldn't call
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      > >
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      > > functions.
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      > >
      >
      > > On Wed, 2010-01-27 at 00:17 +0530, Shameem Ahamed wrote:
      >
      > >
      >
      > > > LOG was opened before calling the daemon function in the global scope.
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      > >
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      > > >
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      > >
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      > > > This is the entire program.
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      > >
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      > > > I am calling other function after calling daemon , which should be running in child process.
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      > >
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      > > >
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      > >
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      > > >
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      > >
      >
      > > > open(LOG,">> $LOGFILE") || die("Unable to create Log file $LOGFILE : $! \n Please run as SUPER user");
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      > >
      >
      > > >
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      > >
      >
      > > > &readConfigXML( $config_file) ;
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      > >
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      > > > &Daemonize() ;
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      > >
      >
      > > >
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      > >
      >
      > > > while(1)
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      > >
      >
      > > > {
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      > >
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      > > >
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      > >
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      > > > &Slow_Query_ Kill();
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      > >
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      > > > sleep($slowtime)
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      > >
      >
      > > > }
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      > >
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      > > >
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      > >
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      > > > close(LOG);
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      > >
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      > > >
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      > >
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      > > >
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      > >
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      > > > --- On Wed, 1/27/10, James Washer <washergrp@trlp. com> wrote:
      >
      > >
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      > > >
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      > >
      >
      > > > From: James Washer <washergrp@trlp. com>
      >
      > >
      >
      > > > Subject: Re: [PBML] Perl forking acting wierd
      >
      > >
      >
      > > > To: perl-beginner@ yahoogroups. com
      >
      > >
      >
      > > > Date: Wednesday, January 27, 2010, 12:02 AM
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      > >
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      > > >
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      > > >
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      > > >
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      > > >
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      > > >
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      > > >
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      > > >
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      > > >
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      > > >
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      > >
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      > > >
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      > >
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      > > >
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      > >
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      > > > Was LOG open?
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      > >
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      > > >
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      > >
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      > > > What do you mean it is unable to call other functions?
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      > >
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      > > >
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      > > > - jim
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      > >
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      > > >
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      > > >
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      > > >
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      > > > On Tue, 2010-01-26 at 23:49 +0530, Shameem Ahamed wrote:
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      > >
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      > > >
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      > >
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      > > > > Hi All,
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      > >
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      > > >
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      > >
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      > > > >
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      > >
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      > > >
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      > > > > I have a subroutine to create a daemon, subroutine is pasted below.
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      > > >
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      > >
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      > > > >
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      > >
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      > > >
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      > >
      >
      > > > > ub Daemonize() {
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      > >
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      > > >
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      > >
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      > > > >
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      > >
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      > > >
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      > >
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      > > > > my $pid;
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      > >
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      > > >
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      > >
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      > > > > $pid=fork();
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      > >
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      > > >
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      > >
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      > > > > if(! defined($pid) ){
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      > >
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      > > >
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      > >
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      > > > > #Forking Failed, we exit at this point
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      > >
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      > > >
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      > >
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      > > > > die("forking failed\n");
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      > >
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      > > >
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      > >
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      > > > > exit(1);
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      > >
      >
      > > >
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      > >
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      > > > > }
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      > >
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      > > >
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      > >
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      > > > > if ($pid>0) {
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      > >
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      > > >
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      > >
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      > > > > print LOG "Forking Success. Child PID: $pid \n";
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      > >
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      > > >
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      > >
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      > > > > exit();
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      > >
      >
      > > >
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      > >
      >
      > > > > }
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      > >
      >
      > > >
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      > >
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      > > > >
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      > >
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      > > >
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      > >
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      > > > > $|=1;
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      > >
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      > > >
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      > >
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      > > > >
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      > >
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      > > >
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      > >
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      > > > > print LOG "Child Process Executing... \n";
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      > >
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      > > >
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      > >
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      > > > > setsid();
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      > >
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      > > >
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      > >
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      > > > > chdir('/');
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      > >
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      > > >
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      > >
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      > > > > umask(0);
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      > >
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      > > >
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      > >
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      > > > >
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      > >
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      > > >
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      > >
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      > > > > close(STDIN) ;
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      > >
      >
      > > >
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      > >
      >
      > > > > close(STDOUT) ;
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      > >
      >
      > > >
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      > >
      >
      > > > > close(STDERR) ;
      >
      > >
      >
      > > >
      >
      > >
      >
      > > > > }
      >
      > >
      >
      > > >
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      > >
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      > > > >
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      > >
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      > > >
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      > >
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      > > > >
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      > >
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      > > >
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      > >
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      > > > > I ran in to an issue in this code. In the child process (which becomes the session leader), I am not getting any data logged or the child process is not able to call even the other functions.
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      > >
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      > > >
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      > >
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      > > > >
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      > >
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      > > >
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      > >
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      > > > > Can anyone please help me ?.
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      > >
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      > > >
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      > >
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      > > > >
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      > >
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      > > >
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      > > > > Shammi
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      > >
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      > > >
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      > > > >
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      > > > >
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      > > >
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      > > > > ------------ --------- --------- ------
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      > > >
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      > > > >
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      > > >
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      > >
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      > > > > Unsubscribing info is here: http://help. yahoo.com/ help/us/groups/ groups-32. htmlYahoo! Groups Links
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      > > > ------------ --------- --------- ------
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      > > > Unsubscribing info is here: http://help. yahoo.com/ help/us/groups/ groups-32. htmlYahoo! Groups Links
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      > > ------------ --------- --------- ------
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      > > Unsubscribing info is here: http://help. yahoo.com/ help/us/groups/ groups-32. htmlYahoo! Groups Links
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      > ------------------------------------
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      > Unsubscribing info is here: http://help.yahoo.com/help/us/groups/groups-32.htmlYahoo! Groups Links
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