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In GNU Emacs 19.27.3 (sparc-sun-sunos4.1.3, X toolkit) of Sun Oct  2 1994 on sharman

We have many tools encapsulated in shell scripts to log usages.  (For
new emacs version we also change EMACSLOADPATH and INFOPATH, too.)

When I upgraded from 19.25 to 19.27 emacs won't work if invoked from a
script, but does if called directly from the shell.  This is only true
if output is to a tty - if using X windows it works fine.

Attaching to it with gdb showed it had received a SIGTTOU from the
ioctl in emacs_get_tty line 942 (after the comment starting "I give
up").  I tried changing src/s/sun line 8 - replacing the #if 0 with
#if 1 to enable HAVE_TERMIOS but that didn't help, it merely stopped
#at the ioctl on line 922 I believe.

I added
   signal(SIGTTOU,  SIG_IGN)     ;
in emacs.c and that made output appear; I got the initial output but
wasn't able to type in anything.  Attaching with gdb showed it was now
getting a SIGTTIN in read called from wait_reading_process_input 
from process.c line 2064.


I tried to see if not setting the process group had any effect, but I
didn't get anywhere with this.  Any suggestions would be gratefully
received!  (The shell script was standard /bin/sh;  I also tried using
a zsh script but it made no difference.)

I did the same upgrade at home on Linux, and the problem does not occur.

Thanks.
Richard.