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Interrupt Handling

by anshumangoyal (Scribe)
on Sep 02, 2012 at 10:03 UTC ( #991256=perlquestion: print w/ replies, xml ) Need Help??
anshumangoyal has asked for the wisdom of the Perl Monks concerning the following question:

I have a number of scripts which are controlled by a main script (Main.pl). Main Script Forks a process to run other scripts in different process and manages this process. While sending interrupt, i have written a interrupt handler in Main.pl. This handler prints "Wait I am killing". Now when I pass on an interrupt to my main program (while it is running another childs), this message is not printed once but many times (at-least the number of times the number of processes are running. Cannot understand why it is doing so.

Comment on Interrupt Handling
Re: Interrupt Handling
by zentara (Archbishop) on Sep 02, 2012 at 10:16 UTC
    You havn't shown code, but it is likely you need a localized SIG handler in your children. 
    #!/usr/bin/perl

$SIG{INT} = sub { print "Caught zap in $$\n"; exit };

if ( my $pid = fork() ) {
    print "Parent Start\n";
    sleep 5;
    local $SIG{INT} = sub { print "Parent $$ ignoring zap\n" };
    kill 2 => $pid, $$;
    sleep 10;
    print "Parent exit!\n";
}
else {
    print "Child start\n";
    sleep 10;
    print "Child exit!\n";
}


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