Re: On solaris, a SIGINT sent to a child process of Korn Shell kills the shell itself

[Stefano Lattarini]

On Monday 12 September 2011, Stefano Lattarini wrote:
> On Monday 12 September 2011, Stefano Lattarini wrote:
> >
> > The "default" Korn Shell on Debian GNU/Linux (package `ksh', version
> > `93u-1') seems to exhibit the same issue.
> >  
> > And if I'm not reading the strace output wrong, this is due to the fact
> > that the Debian korn shell is apparently killing itself (yikes!) with the
> > same signal that killed the child process:
>
> It's better on Solaris: its /bin/ksh (and /usr/xpg4/bin/sh) "only" exit
> with status 130 [*] if a child is terminated by a SIGINT; so the signal is
> not "recursively propagated".
> 
> [*] Well, it still executes the trap associated with SIGINT, but probably
>     does so through special-cased code, without passing through real `kill'
>     system calls.  I guess.
> 
These might also be useful to better understand the issue in question:
 
<http://mail.opensolaris.org/pipermail/ksh93-integration-discuss/2009-February/004121.html>
 <http://www.cons.org/cracauer/sigint.html>
In particular, the second one hints how the ksh behaviour might be desirable
sometimes.  Still, other times it's just a PITA, so I'd love to have an option
to disable it.  Oh well, now that I've understood the problem, working around
it in the automake testsuite shouldn't be too difficult anyway.

Regards,
  Stefano