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Fix D-Bus session bus issue when running as a daemon
Patch backported from emacs-29 branch
https://bugs.gentoo.org/908438
commit 1383efe01d0ee8ba3ea8da5ab41b07f5672191bf
Author: Michael Albinus <michael.albinus@gmx.de>
Date: Mon Jun 12 12:45:38 2023 +0200
Fix setting $DBUS_SESSION_BUS_ADDRESS after Emacs has started
--- emacs-28.2/doc/misc/dbus.texi
+++ emacs-28.2/doc/misc/dbus.texi
@@ -1853,8 +1853,24 @@
corresponding bus. For the system and session buses, this function is
called when loading @file{dbus.el}, there is no need to call it again.
-The function returns the number of connections this Emacs session has
-established to the @var{bus} under the same unique name
+If Emacs was invoked when there was no D-Bus session bus available
+yet, you can set the environment variable
+@env{DBUS_SESSION_BUS_ADDRESS} once the session bus daemon is running
+and offering the address. Calling @code{dbus-init-bus} initializes
+the connection to the session bus.
+
+@lisp
+(setenv "DBUS_SESSION_BUS_ADDRESS" "unix:path=/run/user/1000/bus")
+
+@result{} "unix:path=/run/user/1000/bus"
+
+(dbus-init-bus :session)
+
+@result{} 2
+@end lisp
+
+@code{dbus-init-bus} returns the number of connections this Emacs
+session has established to the @var{bus} under the same unique name
(@pxref{dbus-get-unique-name}). It depends on the libraries Emacs is
linked with, and on the environment Emacs is running. For example, if
Emacs is linked with the GTK+ toolkit, and it runs in a GTK+-aware
--- emacs-28.2/src/dbusbind.c
+++ emacs-28.2/src/dbusbind.c
@@ -276,7 +276,7 @@
#define XD_DBUS_VALIDATE_BUS_ADDRESS(bus) \
do { \
- char const *session_bus_address = getenv ("DBUS_SESSION_BUS_ADDRESS"); \
+ char const *session_bus_address = egetenv ("DBUS_SESSION_BUS_ADDRESS"); \
if (STRINGP (bus)) \
{ \
DBusAddressEntry **entries; \
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