Subject: Re: Return addresses from trap signals
To: Ben Harris <>
From: Jason R Thorpe <>
List: tech-kern
Date: 03/05/2001 17:15:12
On Tue, Mar 06, 2001 at 01:06:09AM +0000, Ben Harris wrote:

 > Actually the code I'm currently concerned about is what _calls_
 > trapsignal(), so it's always involved.  If the signal's being ignored then
 > trapsignal() won't do much and the trap handler will return to the PC it
 > just left in the trapframe.

If the signal's being ignored in that case, the process will exit
somewhere else.

 > That's OK for SIGSEGV.  I think SIGSYS will turn out OK anyway (it's not
 > triggered by trapsignal(), but by psignal(), so the syscall handler will
 > update PC if necessary before the sigcontext is generated).  I'm not sure
 > what the results of ignoring SIGILL should be, but I suspect most people
 > would think doing so was silly.
 > Hmm.  How about SIGFPE?

I don't think any other ports filter them out specially... to me, if
a program does Bad Things like that, well..  so it loops.

        -- Jason R. Thorpe <>