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WNOHANG uninitialized?

by hotshot (Prior)
on Feb 02, 2004 at 14:44 UTC ( #325862=perlquestion: print w/replies, xml ) Need Help??

hotshot has asked for the wisdom of the Perl Monks concerning the following question:

Hi guys!

I use the following code for executing a script with timeout on it:
eval { alarm($timeout); pipe(READ,WRITE); if ($pid = fork) { $SIG{CHLD} = sub { $exitStatus = $? while (waitpid(-1, WNOHANG +)) > 0 }; close(WRITE); } else { die "Cannot fork: $!" unless defined $pid; open(STDOUT, ">&=WRITE") or die "Cannot redirect STDOUT: $!"; close(READ); exec ("$extScript") or die "Cannot exec $extScript: $!"; } while(<READ>) { push(@output, $_); } close(READ); alarm(0); }; ## End eval if ($@) { if ($@ =~ /Timeout/) { print "Reached timeout\n"; } else { alarm(0); die; } } else { print Dumper(\@output); }
the above code is wrraped into a function and called with two parameters: script and timeout.
my problem is that i get the following message when calling the function:

Argument "WNOHANG" isn't numeric in waitpid at /../../

and the program gets stuck.
can anyone help?

Replies are listed 'Best First'.
Re: WNOHANG uninitialized?
by Fletch (Bishop) on Feb 02, 2004 at 14:47 UTC
    • use strict
    • use POSIX qw( WNOHANG )

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