Need help with fork() on windows Post: 302552302

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Top Forums Shell Programming and Scripting Need help with fork() on windows Post 302552302 by hansini on Friday 2nd of September 2011 09:47:17 AM

09-02-2011

Registered User

Need help with fork() on windows

Here is my sample perl program.

Code:

my $pid = fork();
if(! $pid )
{
      exec("perl sleep.pl 600");
} 
else
{
      print "PID ==== [$pid]\n";
      sleep 30;
      print "killing the PID [$pid] in 20 seconds\n";
      sleep 20;
      kill 9, $pid;
      print "Done ....\n"; 
}

The PID returns the pseudo process ID ( which is a negative number). When kill command sends 9 signal to the pseudo process ID, ( I assume the exec process ID falls under pseudo process ID) the exec process won't get killed.

Any help on how to kill the exec process on windows? I'm running this program on Windows XP.

Thanks In Advance
Hansini

Last edited by Franklin52; 09-02-2011 at 10:51 AM.. Reason: Please use code tags for code and data samples, thank you

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io::pipe

IO::Pipe(3pm)						 Perl Programmers Reference Guide					     IO::Pipe(3pm)

NAME

       IO::Pipe - supply object methods for pipes

SYNOPSIS

	       use IO::Pipe;

	       $pipe = IO::Pipe->new();

	       if($pid = fork()) { # Parent
		   $pipe->reader();

		   while(<$pipe>) {
		       ...
		   }

	       }
	       elsif(defined $pid) { # Child
		   $pipe->writer();

		   print $pipe ...
	       }

	       or

	       $pipe = IO::Pipe->new();

	       $pipe->reader(qw(ls -l));

	       while(<$pipe>) {
		   ...
	       }

DESCRIPTION

       "IO::Pipe" provides an interface to creating pipes between processes.

CONSTRUCTOR

       new ( [READER, WRITER] )
	   Creates an "IO::Pipe", which is a reference to a newly created symbol (see the "Symbol" package). "IO::Pipe::new" optionally takes two
	   arguments, which should be objects blessed into "IO::Handle", or a subclass thereof. These two objects will be used for the system call
	   to "pipe". If no arguments are given then method "handles" is called on the new "IO::Pipe" object.

	   These two handles are held in the array part of the GLOB until either "reader" or "writer" is called.

METHODS

       reader ([ARGS])
	   The object is re-blessed into a sub-class of "IO::Handle", and becomes a handle at the reading end of the pipe. If "ARGS" are given
	   then "fork" is called and "ARGS" are passed to exec.

       writer ([ARGS])
	   The object is re-blessed into a sub-class of "IO::Handle", and becomes a handle at the writing end of the pipe. If "ARGS" are given
	   then "fork" is called and "ARGS" are passed to exec.

       handles ()
	   This method is called during construction by "IO::Pipe::new" on the newly created "IO::Pipe" object. It returns an array of two objects
	   blessed into "IO::Pipe::End", or a subclass thereof.

SEE ALSO

       IO::Handle

AUTHOR

       Graham Barr. Currently maintained by the Perl Porters.  Please report all bugs to <perlbug@perl.org>.

COPYRIGHT

       Copyright (c) 1996-8 Graham Barr <gbarr@pobox.com>. All rights reserved.  This program is free software; you can redistribute it and/or
       modify it under the same terms as Perl itself.

perl v5.16.2							    2012-10-11							     IO::Pipe(3pm)