bug#16892: 24.3; terminal corruption after emacsclient -t &

[a.amann]

after doing:

emacs -Q -f server-start&
emacsclient -t &

from a terminal, the terminal gets corrupted.  The terminal shows the
emacs buffer, but the shell and not emacs receives the keystrokes.
Expected behaviour would be to stop emacsclient immediately when it is
started in the backround and needs the current tty. This would be
consistent with behaviour of "emacs -Q -nw &"

The attached patch for emacsclient.c fixes this problem by checking if
emacsclient is started in the background, and raising SIGSTOP, if that
is the case.  This fixes the problem for me, but I cannot guarantee that
this has no side effects.



In GNU Emacs 24.3.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.7)
 of 2014-01-28 on var-lib-archbuild-extra-x86_64-juergen
Windowing system distributor `The X.Org Foundation', version 11.0.11500000
System Description:     Arch Linux

Configured using:
 `configure '--prefix=/usr' '--sysconfdir=/etc' '--libexecdir=/usr/lib'
 '--localstatedir=/var' '--with-x-toolkit=gtk3' '--with-xft'
 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fstack-protector
 --param=ssp-buffer-size=4'
 'LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro'
 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-x r e p o <tab> r <tab> <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Making completion list...

Load-path shadows:
None found.

Features:
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mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev
gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util
mail-prsvr mail-utils help-mode easymenu time-date tooltip ediff-hook
vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image
regexp-opt fringe tabulated-list newcomment lisp-mode register page
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0001-Fix-emacsclient-s-behavior-when-started-in-backgroun.patch
Description: Text Data