# Copyright 1999-2012 by Paul Johnson (paul@pjcj.net)
# documentation at __END__
# Original author: Paul Johnson
# Created: Fri 12 Mar 1999 10:25:51 am
use strict;
require 5.004;
package System;
use Exporter ();
use vars qw($VERSION @ISA @EXPORT);
$VERSION = do { my @r = (q$Revision: 1.1 $ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r }; # must be all one line, for MakeMaker
@ISA = ("Exporter");
@EXPORT = ("sys", "dsys");
my $Command = 0;
my $Errors = 0;
my $Verbose = 0;
sub import
{
my $class = shift;
my $args = "@_";
$Command = $args =~ /\bcommand\b/i;
$Errors = $args =~ /\berror\b/i;
$Verbose = $args =~ /\bverbose\b/i;
$Command ||= $Verbose;
$Errors ||= $Verbose;
$class->export_to_level(1, "sys" ) if $args =~ /\bsys\b/i;
$class->export_to_level(1, "dsys") if $args =~ /\bdsys\b/i;
}
sub sys
{
my (@command) = @_;
local $| = 1;
print "@command" if $Command;
my $rc = 0xffff & system @command;
print "\n" if $Command && !$rc && !$Verbose;
ret($rc);
}
sub dsys
{
die "@_ failed" if sys @_;
}
sub ret
{
my ($rc) = @_;
printf " returned %#04x: ", $rc if $Errors && $rc;
if ($rc == 0)
{
print "ran with normal exit\n" if $Verbose;
}
elsif ($rc == 0xff00)
{
print "command failed: $!\n" if $Errors;
}
elsif ($rc > 0x80)
{
$rc >>= 8;
print "ran with non-zero exit status $rc\n" if $Errors;
}
else
{
print "ran with " if $Errors;
if ($rc & 0x80)
{
$rc &= ~0x80;
print "coredump from " if $Errors;
}
print "signal $rc\n" if $Errors;
}
$rc;
}
1
__END__
=head1 NAME
System - run a system command and check the result
=head1 SYNOPSIS
use System "command, verbose, errors";
sys qw(ls -al);
=head1 DESCRIPTION
The sys function runs a system command, checks result, and comments on
it.
=cut