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# $Id: Signal.pm,v 1.4 1998-10-27 16:16:13-05 roderick Exp $
#
# Copyright (c) 1997 Roderick Schertler. All rights reserved. This
# program is free software; you can redistribute it and/or modify it
# under the same terms as Perl itself.
package IPC::Signal;
use 5.003_94; # __PACKAGE__
use strict;
use vars qw($VERSION @ISA @EXPORT_OK $AUTOLOAD %Sig_num @Sig_name);
require Exporter;
$VERSION = '1.00';
@ISA = qw(Exporter);
@EXPORT_OK = qw(sig_num sig_name sig_translate_setup %Sig_num @Sig_name);
%Sig_num = ();
@Sig_name = ();
sub sig_num ($);
sub sig_name ($);
sub sig_translate_setup () {
return if %Sig_num && @Sig_name;
require Config;
# In 5.005 the sig_num entries are comma separated and there's a
# trailing 0.
my $num = $Config::Config{'sig_num'};
if ($num =~ s/,//g) {
$num =~ s/\s+0$//;
}
my @name = split ' ', $Config::Config{'sig_name'};
my @num = split ' ', $num;
@name or die 'No signals defined';
@name == @num or die 'Signal name/number mismatch';
@Sig_num{@name} = @num;
keys %Sig_num == @name or die 'Duplicate signal names present';
for (@name) {
$Sig_name[$Sig_num{$_}] = $_
unless defined $Sig_name[$Sig_num{$_}];
}
}
# This autoload routine just is just for sig_num() and sig_name(). It
# calls sig_translate_setup() and then snaps the real function definitions
# into place.
sub AUTOLOAD {
if ($AUTOLOAD ne __PACKAGE__ . '::sig_num'
&& $AUTOLOAD ne __PACKAGE__ . '::sig_name') {
require Carp;
Carp::croak("Undefined subroutine &$AUTOLOAD called");
}
sig_translate_setup;
*sig_num = sub ($) { $Sig_num{$_[0]} };
*sig_name = sub ($) { $Sig_name[$_[0]] };
goto &$AUTOLOAD;
}
1
__END__
=head1 NAME
IPC::Signal - Utility functions dealing with signals
=head1 SYNOPSIS
$number = sig_num $name;
$name = sig_name $number;
sig_translate_setup;
$number = $Sig_num{$name};
$name = $Sig_name[$number];
=head1 DESCRIPTION
This module contains utility functions for dealing with signals.
Nothing is exported by default.
=over
=item B<sig_num> I<chopped-signal-name>
Returns the signal number of the signal whose name (sans C<SIG>) is
I<chopped-signal-name>, or undef if there is no such signal.
This function is prototyped to take a single scalar argument.
=item B<sig_name> I<signal-number>
Returns the chopped signal name (like C<HUP>) of signal number
I<signal-number>, or undef if there is no such signal.
This function is prototyped to take a single scalar argument.
=item B<sig_translate_setup>
If you want to use the @Sig_name and %Sig_num variables directly you must
call B<sig_translate_setup> to initialize them. This isn't necessary if
you only use the function interfaces sig_name() and sig_num().
This function is prototyped to take no arguments.
=item B<%Sig_num>
A hash with chopped signal name keys (like C<HUP>) and integer signal
number values.
=item B<@Sig_name>
An array mapping signal numbers to chopped signal names (like C<HUP>).
=back
=head1 AUTHOR
Roderick Schertler <F<roderick@argon.org>>
=head1 SEE ALSO
perl(1).
=cut
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