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Re: Emacs 22.0.50 and suspending while logged into another system

From: Quanah Gibson-Mount
Subject: Re: Emacs 22.0.50 and suspending while logged into another system
Date: Mon, 16 Oct 2006 15:30:52 -0700

--On Sunday, October 15, 2006 12:20 AM -0400 Richard Stallman <address@hidden> wrote:

    In any case, you now have the information on what "tty" contained
after it      exited from EMACS_SET_TTY, and I'll leave it up to you and
the other      developers to decide whether or not that data was 'bad' or

Did you examine that value just before the failure?
That is, did it fail just after this call to init_sys_modes?
init_sys_modes will be called each time you resume Emacs after
suspending; the time that we need to see the value
is the time that it fails.

It would be good to see the value of tty after EMACS_SET_TTY,
and the value of old_tty too.

Hi Richard,

I set up the following in gdb:

l sysdep.c:1637
break 1637

(this is the line after EMACS_SET_TTY is called in the source I have).

Then, I

run -nw

Then use control-Z to suspend.

This *usually* then breaks at line 1637. If this is where the break occurs, everything continues to work as desired.

However, sometimes it breaks in _libc_kill instead, completely bypassing EMACS_SET_TTY. After this, things don't work correctly. So it appears that the same logic is not always being followed when a SIGTSTP is caught.

The usual path I get is:

Breakpoint 1, init_sys_modes () at sysdep.c:1642
1642          if (!flow_control) ioctl (input_fd, TCXONC, 1);
(gdb) cont
Program received signal SIGTSTP, Stopped (user).
0xfe6990cc in _poll () from /usr/lib/libc.so.1

Then I issue "signal SIGCONT" to resume.

On the other path:

Program received signal SIGTSTP, Stopped (user).
0xfe69b638 in _libc_kill () from /usr/lib/libc.so.1

I tried "step"ing from here, but it just hangs forever, without entering init_sys_modes.

I can reproduce this very easily. If I give a "signal SIGCONT" here, then it'll let me back into emacs.


Quanah Gibson-Mount
Principal Software Developer
ITS/Shared Application Services
Stanford University
GnuPG Public Key: http://www.stanford.edu/~quanah/pgp.html

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