But there's still a mystery here. Why does it behave differently under rxvt
vs. xterm,
and why does that difference show up in bash 4.4-beta but not in 4.3.30?
(Both versions of bash are built from source on the same system.)
Running bash 4.3.30 under either xterm 261 or rxvt v2.6.4, I get:
bash-4.3$ trap
trap -- '' SIGTSTP
trap -- '' SIGTTIN
trap -- '' SIGTTOU
and Ctrl-Z works correctly.
Running bash-4.4-beta under xterm, I get
bash-4.4$ trap
trap -- '' SIGTTOU
and Ctrl-Z works correctly. Running bash-4.4-beta under rxvt, I get:
bash-4.4$ trap
trap -- '' SIGTSTP
trap -- '' SIGTTIN
trap -- '' SIGTTOU
and Ctrl-Z *doesn't* work.
The issue for me personally is that I'd like to run bash 4.4-beta, which
corrects
some bugs I've run into, under urxvt, which has better font support than
xterm.
Is there a workaround, a way to re-enable correct Ctrl-Z handling?
On Tue, Nov 10, 2015 at 7:33 AM, Chet Ramey <chet.ra...@case.edu> wrote:
> On 11/9/15 5:55 PM, Keith Thompson wrote:
> > I have some more information on this. In the latest test,
> > the problem occurs when I run bash under rxvt, but not when I run it
> under
> > xterm.
> >
> > Using strace, I've found a difference in a call to rt_sigaction(). It
> calls
> >
> > rt_sigaction(SIGTSTP, {SIG_DFL, ...})
> >
> > under xterm (which works correctly), but
> >
> > rt_sigaction(SIGTSTP, {SIG_IGN, ...})
> >
> > under rxvt (where it doesn't).
>
> This can happen if SIGTSTP is ignored when the shell is invoked. When
> bash restores the original signal dispositions in child processes, it
> restores SIG_IGN.
>
> --
> ``The lyf so short, the craft so long to lerne.'' - Chaucer
> ``Ars longa, vita brevis'' - Hippocrates
> Chet Ramey, ITS, CWRU c...@case.edu
> http://cnswww.cns.cwru.edu/~chet/
>
--
Keith Thompson <keith.s.thomp...@gmail.com>
