= $_ or croak "sigtrap.pm version $_ required,"
. " but this is only version $VERSION";
}
else {
croak "Unrecognized argument $_";
}
}
unless ($saw_sig) {
@_ = qw(old-interface-signals);
goto Arg_loop;
}
}
sub handler_die {
croak "Caught a SIG$_[0]";
}
sub handler_traceback {
package DB; # To get subroutine args.
$SIG{'ABRT'} = DEFAULT;
kill 'ABRT', $$ if $panic++;
syswrite(STDERR, 'Caught a SIG', 12);
syswrite(STDERR, $_[0], length($_[0]));
syswrite(STDERR, ' at ', 4);
($pack,$file,$line) = caller;
syswrite(STDERR, $file, length($file));
syswrite(STDERR, ' line ', 6);
syswrite(STDERR, $line, length($line));
syswrite(STDERR, "\n", 1);
# Now go for broke.
for ($i = 1; ($p,$f,$l,$s,$h,$w,$e,$r) = caller($i); $i++) {
@a = ();
for my $fr (@args) {
my $_ = $fr;
s/([\'\\])/\\$1/g;
s/([^\0]*)/'$1'/
unless /^(?: -?[\d.]+ | \*[\w:]* )$/x;
s/([\200-\377])/sprintf("M-%c",ord($1)&0177)/eg;
s/([\0-\37\177])/sprintf("^%c",ord($1)^64)/eg;
push(@a, $_);
}
$w = $w ? '@ = ' : '$ = ';
$a = $h ? '(' . join(', ', @a) . ')' : '';
$e =~ s/\n\s*\;\s*\Z// if $e;
$e =~ s/[\\\']/\\$1/g if $e;
if ($r) {
$s = "require '$e'";
} elsif (defined $r) {
$s = "eval '$e'";
} elsif ($s eq '(eval)') {
$s = "eval {...}";
}
$f = "file '$f'" unless $f eq '-e';
$mess = "$w$s$a called from $f line $l\n";
syswrite(STDERR, $mess, length($mess));
}
kill 'ABRT', $$;
}
1;
__END__
=head1 SYNOPSIS
use sigtrap;
use sigtrap qw(stack-trace old-interface-signals); # equivalent
use sigtrap qw(BUS SEGV PIPE ABRT);
use sigtrap qw(die INT QUIT);
use sigtrap qw(die normal-signals);
use sigtrap qw(die untrapped normal-signals);
use sigtrap qw(die untrapped normal-signals
stack-trace any error-signals);
use sigtrap 'handler' => \&my_handler, 'normal-signals';
use sigtrap qw(handler my_handler normal-signals
stack-trace error-signals);
=head1 DESCRIPTION
The B pragma is a simple interface to installing signal
handlers. You can have it install one of two handlers supplied by
B itself (one which provides a Perl stack trace and one which
simply Cs), or alternately you can supply your own handler for it
to install. It can be told only to install a handler for signals which
are either untrapped or ignored. It has a couple of lists of signals to
trap, plus you can supply your own list of signals.
The arguments passed to the C