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package sigtrap;
=head1 NAME
sigtrap - Perl pragma to enable stack backtrace on unexpected signals
=head1 SYNOPSIS
use sigtrap;
use sigtrap qw(BUS SEGV PIPE SYS ABRT TRAP);
=head1 DESCRIPTION
The C<sigtrap> pragma initializes some default signal handlers that print
a stack dump of your Perl program, then sends itself a SIGABRT. This
provides a nice starting point if something horrible goes wrong.
By default, handlers are installed for the ABRT, BUS, EMT, FPE, ILL, PIPE,
QUIT, SEGV, SYS, TERM, and TRAP signals.
See L<perlmod/Pragmatic Modules>.
=cut
require Carp;
sub import {
my $pack = shift;
my @sigs = @_;
@sigs or @sigs = qw(QUIT ILL TRAP ABRT EMT FPE BUS SEGV SYS PIPE TERM);
foreach $sig (@sigs) {
$SIG{$sig} = 'sigtrap::trap';
}
}
sub trap {
package DB; # To get subroutine args.
$SIG{'ABRT'} = DEFAULT;
kill 'ABRT', $$ if $panic++;
syswrite(STDERR, 'Caught a SIG', 12);
syswrite(STDERR, $_[0], length($_[0]));
syswrite(STDERR, ' at ', 4);
($pack,$file,$line) = caller;
syswrite(STDERR, $file, length($file));
syswrite(STDERR, ' line ', 6);
syswrite(STDERR, $line, length($line));
syswrite(STDERR, "\n", 1);
# Now go for broke.
for ($i = 1; ($p,$f,$l,$s,$h,$w,$e,$r) = caller($i); $i++) {
@a = ();
for $arg (@args) {
$_ = "$arg";
s/([\'\\])/\\$1/g;
s/([^\0]*)/'$1'/
unless /^(?: -?[\d.]+ | \*[\w:]* )$/x;
s/([\200-\377])/sprintf("M-%c",ord($1)&0177)/eg;
s/([\0-\37\177])/sprintf("^%c",ord($1)^64)/eg;
push(@a, $_);
}
$w = $w ? '@ = ' : '$ = ';
$a = $h ? '(' . join(', ', @a) . ')' : '';
$e =~ s/\n\s*\;\s*\Z// if $e;
$e =~ s/[\\\']/\\$1/g if $e;
if ($r) {
$s = "require '$e'";
} elsif (defined $r) {
$s = "eval '$e'";
} elsif ($s eq '(eval)') {
$s = "eval {...}";
}
$f = "file `$f'" unless $f eq '-e';
$mess = "$w$s$a called from $f line $l\n";
syswrite(STDERR, $mess, length($mess));
}
kill 'ABRT', $$;
}
1;
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