bug#17386: 24.3.90; emacs_abort in cmcheckmagic

[Eli Zaretskii]

> From: Andreas Schwab <schwab@linux-m68k.org>
> Cc: Nicolas Richard <theonewiththeevillook@yahoo.fr>,  17386@debbugs.gnu.org
> Date: Sat, 03 May 2014 10:21:22 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > So perhaps the problem is that Emacs takes the screen dimensions only
> > at startup and when it gets the SIGWINCH signal, and tmux somehow
> > makes these changes without sending SIGWINCH?
> 
> The signal is generated by the kernel, upon the submit of the TIOCSWINSZ
> ioctl, so it is impossible to change the size without generating the
> signal.

Can we be sure that tmux reserves its line via that ioctl?