On Tue, Nov 10, 2015 at 11:35 AM, Chet Ramey <[email protected]> wrote:
>
>
> It seems like you need to figure out why rxvt starts the shell with
> SIGTSTP ignored. It doesn't seem like anything that the system /bin/sh
> or the bash version you're running does, since xterm doesn't exhibit
> this behavior.
>
> The difference between bash-4.3 and bash-4.4 is a bug fix: if the shell
> is started with SIGTSTP ignored (any signal, really), it's supposed to
> pass that setting on to the children it invokes. bash-4.3 didn't do that
> in this case, and bash-4.4 does.
>
>
And I think I've found it. In rxvt 2.6.4, src/command.c:
/*
* mimick login's behavior by disabling the job control signals
* a shell that wants them can turn them back on
*/
#ifdef SIGTSTP
signal(SIGTSTP, SIG_IGN);
signal(SIGTTIN, SIG_IGN);
signal(SIGTTOU, SIG_IGN);
#endif /* SIGTSTP */
The latest release, rxvt 2.7.10, has the same code in src/init.c.
rxvt-unicode (urxvt) has the same code in src/init.C.
Would you consider this a bug in rxvt? It's obviously intentional, but I
don't understand signal handling well enough to know whether it's
reasonable.
The comment implies that it's the shell's responsibility to re-enable the
signals -- which bash did prior to 4.4-beta, but no longer does.
There's certainly a bug *somewhere*, since anyone using bash 4.4-beta or
later
under rxvt or urxvt won't be able to use Ctrl-Z. If it's rxvt that's
buggy, I'll
contact the rxvt and urxvt maintainers (and I'll probably recompile my own
version with those lines commented out).
--
Keith Thompson <[email protected]>
