Sprad has asked for the wisdom of the Perl Monks concerning the following question:

Are all signals unsafe? Or just the alarm and interrupt signals? What about warn?

I wrote a handler for warnings to give me some more info when things break. But if the warning handler makes things break as well, then obviously I don't want to use it. Is this code bad?

Update: This is under ActiveState Perl 5.6.1, on WinXP

$SIG{__WARN__} = \&mywarn; # ... sub mywarn { my $warning = shift; my $i = 0; open (WRNLOG, ">>Warnings.log") || warn "Can't open warnings log f +ile: $!"; # If open failed, output will be discarded print STDOUT "WARNING: $warning"; print WRNLOG "WARNING: $warning"; print STDOUT " Stack Trace:\n"; print WRNLOG " Stack Trace:\n"; while (caller($i)) { my (undef, $filename, $line, $sub) = caller($i); print STDOUT " $filename ($line) --- $sub\n"; print WRNLOG " $filename ($line) --- $sub\n"; $i++; } print STDOUT "\n"; print WRNLOG "\n"; }

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