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Re: Bug in bash 4.4-beta: suspending and restarting "man" program


From: Keith Thompson
Subject: Re: Bug in bash 4.4-beta: suspending and restarting "man" program
Date: Wed, 11 Nov 2015 15:34:32 -0800

On Wed, Nov 11, 2015 at 3:16 PM, Keith Thompson <address@hidden> wrote:
On Wed, Nov 11, 2015 at 11:55 AM, Chet Ramey <address@hidden> wrote:
On 11/10/15 10:03 PM, Keith Thompson wrote:
> On Tue, Nov 10, 2015 at 2:42 PM, Keith Thompson <address@hidden
> <mailto:address@hidden>> wrote:
>
>     On Tue, Nov 10, 2015 at 1:57 PM, Andreas Schwab <address@hidden
>     <mailto:address@hidden>> wrote:
>
>         Chet Ramey <address@hidden <mailto:address@hidden>> writes:
>
>         > I can make bash blow away the original signal dispositions and pretend they
>         > were SIG_DFL when an interactive shell starts, if there is no alternative.
>
>         Given that login(1) has the same behaviour there is probably no
>         alternative.
>
>     Hmm. I just tried bash 4.4-beta on a Linux console (Ctrl-Alt-F1), and
>     Ctrl-Z works correctly.
>     I verified that the shell's parent process was "login".
>     Perhaps (at least the Debian version of) login(1) *doesn't* do that.
>
> I'm going to hold off on contacting the rxvt and urxvt developers
> for now.  If you decide to modify bash to blow away the original signal
> dispositions, there's no point in reporting this as a bug in rxvt.
>
> Does that make sense?

Yeah, that's fine.  I will modify bash to set the original signal
dispositions to SIG_DFL in interactive shells.
 
Does that mean reverting default_tty_job_signals() in jobs.h to the
version in bash 4.3.30:

  set_signal_handler (SIGTSTP, SIG_DFL);
  set_signal_handler (SIGTTIN, SIG_DFL);
  set_signal_handler (SIGTTOU, SIG_DFL);

or is there more to it than that?  (I'd like to try out the change myself.)


To answer my own question, I changed default_tty_job_signals()
as described in jobs.c and nojobs.c, and commented out
default_tty_job_signals() and all calls to it. It seems to work
(Ctrl-Z works when I run the shell under rxvt).

--
Keith Thompson <address@hidden>

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