I've re-produced a small example that hopefully gives you an idea of the problem. Copy past below and you are able to see it from my perspective. The point is that everytime you run "kill -s USR1 <pid>" you will see that processes gets killed.

Put this content in "mainprogram" and 'chmod a+x' 

#!/usr/bin/perl -w
use strict;
use warnings;
use IPC::Open3;
use IO::Select;

my($StartedProcess);
$SIG{USR1} = \&status;

sub status () {
  $SIG{USR1} = \&status;
  print STDERR "Currently running:  $StartedProcess\n";
}

# Opens external program, and as long as it exists, checks
# if there is data in the pipe (STDOUT/STDERR)
sub createProcess () {
  my($line, $selector, @ready, $fh);

  $StartedProcess = open3(*CMD_IN, *CMD_OUT, *CMD_ERR, "./external.pp"
+);
  close(CMD_IN);

  $selector = IO::Select->new();
  $selector->add(*CMD_ERR, *CMD_OUT);

   while(@ready = $selector->can_read) {
        # do some operations on STDOUT/STDERR here
   }
   close(CMD_OUT);
   close(CMD_ERR);
}

my($pid) = fork;

if($pid) {
  print "\t Created PID: $pid. run 'kill -s USR1 $pid'\n";
  exit(0);
}

foreach(qw/1 2 3 4 5 6 7 8 9 10/) {
  createProcess();
}

print STDERR "\n COMPLETED !";
exit(0);

[download]

Put this content in "external.pp" and 'chmod a+x' 
#!/usr/bin/perl -w

use strict;
my $i = 0;

while ($i <= 10) {
  sleep(3);
  $i+= 3;
}

[download]

In reply to Re^7: Signal to parent-process. Does it affect it's children? by rapide
in thread Signal to parent-process. Does it affect it's children? by rapide

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