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, 20 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index 29efd9f181c..6c515271594 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,25 @@
 2012-11-05  Paul Eggert  <eggert@cs.ucla.edu>
 
+        Assume at least POSIX.1-1988 for getpgrp, setpgid, setsid (Bug#12800).
+        This removes code that has been obsolete since around 1990.
+        * callproc.c (Fcall_process):
+        * emacs.c (main):
+        * process.c (create_process):
+        * term.c (dissociate_if_controlling_tty):
+        Assume setsid exists.
+        * callproc.c (child_setup): Assume setpgid exists and behaves as
+        per POSIX.1-1988 or later.
+        * conf_post.h (setpgid) [!HAVE_SETPGID]: Remove.
+        * emacs.c (shut_down_emacs):
+        * sysdep.c (sys_suspend, init_foreground_group):
+        Assume getpgrp behaves as per POSIX.1-1998 or later.
+        * msdos.c (setpgrp): Remove.
+        (tcgetpgrp, setpgid, setsid): New functions.
+        * systty.h (EMACS_GETPGRP): Remove.  All callers now use getpgrp.
+        * term.c (no_controlling_tty): Remove; unused.
+        * w32proc.c (setpgrp): Remove.
+        (setsid, tcgetpgrp): New functions.
+
         Simplify by assuming __fpending.
         * dispnew.c: Include <fpending.h>, not <stdio_ext.h>.
         (update_frame_1): Use __fpending, not PENDING_OUTPUT_COUNT.