Assume at least POSIX.1-1988 for getpgrp, setpgid, setsid.

This removes code that has been obsolete since around 1990.
* admin/CPP-DEFINES (HAVE_SETPGID, HAVE_SETSID, SETPGRP_RELEASES_CTTY):
Remove; obsolete.
* configure.ac (setpgid, setsid): Assume their existence.
(AC_FUNC_GETPGRP, SETPGRP_RELEASES_CTTY): Remove; obsolete.
* src/callproc.c (Fcall_process):
* src/emacs.c (main):
* src/process.c (create_process):
* src/term.c (dissociate_if_controlling_tty):
Assume setsid exists.
* src/callproc.c (child_setup): Assume setpgid exists and behaves as
per POSIX.1-1988 or later.
* src/conf_post.h (setpgid) [!HAVE_SETPGID]: Remove.
* src/emacs.c (shut_down_emacs):
* src/sysdep.c (sys_suspend, init_foreground_group):
Assume getpgrp behaves as per POSIX.1-1998 or later.
* src/msdos.c (setpgrp): Remove.
(tcgetpgrp, setpgid, setsid): New functions.
* src/systty.h (EMACS_GETPGRP): Remove.  All callers now use getpgrp.
* src/term.c (no_controlling_tty): Remove; unused.
* src/w32proc.c (setpgrp): Remove.
(setsid, tcgetpgrp): New functions.

Fixes: debbugs:12800

1 files changed, 0 insertions, 3 deletions

diff --git a/admin/CPP-DEFINES b/admin/CPP-DEFINES
index fb217fc22e6..0a4c14cb95c 100644
--- a/admin/CPP-DEFINES
+++ b/admin/CPP-DEFINES
@@ -298,9 +298,7 @@ HAVE_SENDTO
 HAVE_SEQPACKET
 HAVE_SETITIMER
 HAVE_SETLOCALE
-HAVE_SETPGID
 HAVE_SETRLIMIT
-HAVE_SETSID
 HAVE_SHARED_GAME_DIR
 HAVE_SHUTDOWN
 HAVE_SIGNED_${GLTYPE}
@@ -432,7 +430,6 @@ PTY_OPEN
 PTY_TTY_NAME_SPRINTF
 PURESIZE
 RUN_TIME_REMAP
-SETPGRP_RELEASES_CTTY
 SETUP_SLAVE_PTY
 SIGALRM
 SIGCHLD