package ForkBlock;
use strict;
use vars qw/$CHILD_PID @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS $VERSION/;
use Carp;
use Exporter;
@ISA=("Exporter");
@EXPORT=qw/Fork Parent Child Error/;
@EXPORT_OK=("DumbFork");
%EXPORT_TAGS=('all' => [qw/Fork Parent Child Error DumbFork/]);
$VERSION=0.02;
sub Fork {
phork(@_) or croak "unable to fork: $!";
exit(0);
}
sub DumbFork {
phork(@_) or croak "unable to fork: $!";
}
sub Parent(&;%) { return "parent", @_ }
sub Child(&;%) { return "child", @_ }
sub Error(&;%) { return "error", @_ }
#private--implements the actual forking
sub phork {
my %params=%{shift()};
my $parent=$params{"parent"};
my $child =$params{"child"} ;
my $error =$params{"error"} ;
local $!;
FORK_IT: {
if($CHILD_PID=fork()) {
#i'm the parent
&$parent;
}
elsif(defined($CHILD_PID)) {
#i'm the child
&$child;
}
else {
#something went wrong
if($! =~ /No more process/) {
#recoverable, so wait a second and try again
sleep 1;
redo FORK_IT;
}
elsif(defined($error)) {
#something went wrong, but an Error block was defi
+ned
&$error;
}
else {
#something went wrong, and the user forgot an Error bl
+ock
return 0;
}
}
}
return 1;
}
1;
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