ibus-daemon always will exits with parent's death.

ibus-HEAD.patch

@@ -15151,3 +15151,123 @@ index b7a72285..3045d601 100755
 -- 
 2.21.0
 
+From 32572618cdcc36162b5769eb4c71964db9734061 Mon Sep 17 00:00:00 2001
+From: fujiwarat <takao.fujiwara1@gmail.com>
+Date: Tue, 6 Aug 2019 18:55:14 +0900
+Subject: [PATCH] bus: Exit ibus-daemon with parent's death
+
+ibus-daemon can be restarted unexpectedly during logging out the session
+and double ibus-x11 prevent from enabling XIM in XGetSelectionOwner()
+for the "ibus" atom.
+ibus-daemon always will exit the process when the parent process dies
+to avoid this problem.
+---
+ bus/main.c   | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++-
+ configure.ac |  3 +++
+ 2 files changed, 58 insertions(+), 1 deletion(-)
+
+diff --git a/bus/main.c b/bus/main.c
+index 3223d541..e11a5ebd 100644
+--- a/bus/main.c
++++ b/bus/main.c
+@@ -33,6 +33,10 @@
+ #include <sys/stat.h>
+ #include <unistd.h>
+ 
++#ifdef HAVE_SYS_PRCTL_H
++#include <sys/prctl.h>
++#endif
++
+ #include "global.h"
+ #include "ibusimpl.h"
+ #include "server.h"
+@@ -161,6 +165,15 @@ daemon (gint nochdir, gint noclose)
+ }
+ #endif
+ 
++#ifdef HAVE_SYS_PRCTL_H
++static void
++_sig_usr1_handler (int sig)
++{
++    g_warning ("The parent process died.");
++    bus_server_quit (FALSE);
++}
++#endif
++
+ gint
+ main (gint argc, gchar **argv)
+ {
+@@ -201,7 +214,7 @@ main (gint argc, gchar **argv)
+     /* daemonize process */
+     if (daemonize) {
+         if (daemon (1, 0) != 0) {
+-            g_printerr ("Can not daemonize ibus.\n");
++            g_printerr ("Cannot daemonize ibus.\n");
+             exit (-1);
+         }
+     }
+@@ -299,6 +312,47 @@ main (gint argc, gchar **argv)
+             exit (-1);
+     }
+ 
++    if (!daemonize) {
++        if (getppid () == 1) {
++            g_warning ("The parent process died.");
++            exit (0);
++        }
++#ifdef HAVE_SYS_PRCTL_H
++       /* Currently ibus-x11 detects XIOError and assume the error as the
++        * desktop session is closed and ibus-x11 calls Exit D-Bus method to
++        * exit ibus-daemon. But a few desktop sessions cause XError before
++        * XIOError and GTK does not allow to bind XError by applications and
++        * GTK calls gdk_x_error() with XError.
++        *
++        * E.g. GdkX11Screen calls XGetSelectionOwner() for "_XSETTINGS_S?"
++        * atoms during the logout but the selection owner already becomes
++        * NULL and the NULL window causes XError with
++        * gdk_x11_window_foreign_new_for_display().
++        *
++        * Since ibus-x11 exits with XError before XIOError, gnome-shell
++        * can detects the exit of ibus-daemon a little earlier and
++        * gnome-shell restarts ibus-daemon but gnome-shell dies soon.
++        * Then gnome-shell dies but ibus-daemon is alive, it's a problem.
++        * Because it causes double ibus-x11 of GDM and a login user
++        * and double XSetSelectionOwner() is not allowed for the unique
++        * "ibus" atom and the user cannot use XIM but not GtkIMModule.
++        *
++        * Probably we could fix the ibus process problem if we would fix
++        * XError about the X selection owner or stop to restart ibus-daemon
++        * in gonme-shell when the session is logging out.
++        * Maybe using SessionManager.LogoutRemote() or
++        * global.screen.get_display().get_xdisplay()
++        * But I assume thereare other scenarios to causes the problem.
++        *
++        * And I decided ibus-daemon always exits with the parent's death here
++        * to avoid unexpected ibus restarts during the logout.
++        */
++        if (prctl (PR_SET_PDEATHSIG, SIGUSR1))
++            g_printerr ("Cannot bind SIGUSR1 for parent death\n");
++        else
++            signal (SIGUSR1, _sig_usr1_handler);
++#endif
++    }
+     bus_server_run ();
+     return 0;
+ }
+diff --git a/configure.ac b/configure.ac
+index f1df3ac1..fdd316a9 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -140,6 +140,9 @@ AC_ISC_POSIX
+ AC_HEADER_STDC
+ LT_INIT
+ 
++# Check header filess.
++AC_CHECK_HEADERS([sys/prctl.h])
++
+ # Check functions.
+ AC_CHECK_FUNCS(daemon)
+ 
+-- 
+2.21.0
+

ibus.spec

@@ -35,7 +35,7 @@
 
 Name:           ibus
 Version:        1.5.20
-Release:        8%{?dist}
+Release:        9%{?dist}
 Summary:        Intelligent Input Bus for Linux OS
 License:        LGPLv2+
 URL:            https://github.com/ibus/%name/wiki
@@ -464,6 +464,9 @@ dconf update || :
 %{_datadir}/installed-tests/ibus
 
 %changelog
+* Tue Aug 06 2019 Takao Fujiwara <tfujiwar@redhat.com> - 1.5.20-9
+- ibus-daemon always will exits with parent's death.
+
 * Wed Jul 31 2019 Takao Fujiwara <tfujiwar@redhat.com> - 1.5.20-8
 - Fix a wrong result in direct testing instead of GNOME desktop testing