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Postings from March 2000
Re: this close to v5.6.0
From:
Tom Christiansen
Date:
March 14, 2000 19:16
Subject:
Re: this close to v5.6.0
Message ID:
4644.953090205@chthon
On Tue, 14 Mar 2000 18:56:23 MST, Tom Christiansen wrote:
>>At this late stage, I think that the fix for the debugger's sigint
>>bug and its eeevil sigdie eval bug should be to add them to the
>>BUGS section and move on.
>Sounds about right to me, unless someone can prove that the
>bug is a showstopper.
Under BUGS, then, in the perldebug manpage, I suggest adding these
two short sentences:
If you're in a slow syscall (like C<wait>ing, C<accept>ing, or
C<read>ing from your keyboard or a socket) and haven't set up
your own C<$SIG{INT}> handler, then you won't be able to CTRL-C
your way back to the debugger, because the debugger's own
C<$SIG{INT}> handler doesn't understand that it needs to
raise an exception to longjmp(3) out of slow syscalls.
Even though you properly trapped them and made them non-fatal,
all exceptions raised from within C<eval>'d strings in your own
program will be accidentally intercepted by the debugger before
you can get to them, printed out with a long backtrace, and
then, before being reraised, altered in a fashion that may cause
perfectly proper programs to messily explode when run under the
debugger.
Look, I didn't even mention how eeevil $SIG{__DIE__} is. :-)
--tom