From 5aebfbcb62614fc2bf2b1579d62e3fe272c6751a Mon Sep 17 00:00:00 2001
From: "david@fubar.dk" <david@fubar.dk>
Date: Mon, 8 Dec 2003 09:19:19 -0800
Subject: [PATCH] D-BUS patch for udev-008

Attached is a patch against udev-008 to send out a D-BUS message when a
device node is added or removed.

Using D-BUS lingo, udev acquires the org.kernel.udev service and sends
out a NodeCreated or NodeDeleted signal on the
org.kernel.udev.NodeMonitor interface. Each signal carries two
parameters: the node in question and the corresponding sysfs path.

[Note: the D-BUS concepts of service, interface, object can be a bit
confusing at first glance]

An example program listening for these messages looks like this

#!/usr/bin/python

import dbus
import gtk

def udev_signal_received(dbus_iface, member, service, object_path, message):
    [filename, sysfs_path] = message.get_args_list()
    if member=='NodeCreated':
        print 'Node %s created for %s'%(filename, sysfs_path)
    elif member=='NodeDeleted':
        print 'Node %s deleted for %s'%(filename, sysfs_path)

def main():
    bus = dbus.Bus(dbus.Bus.TYPE_SYSTEM)
    bus.add_signal_receiver(udev_signal_received,
                            'org.kernel.udev.NodeMonitor',  # interface
                            'org.kernel.udev',              # service
                            '/org/kernel/udev/NodeMonitor') # object

    gtk.mainloop()

if __name__ == '__main__':
    main()

and this is the output when hot-plugging some usb-storage.

[david@laptop udev-008]$ ~/node_monitor.py
Node /udev/sda created for /block/sda
Node /udev/sda1 created for /block/sda/sda1
Node /udev/sda1 deleted for /block/sda/sda1
Node /udev/sda deleted for /block/sda

The patch requires D-BUS 0.20 or later while the python example program
requires D-BUS from CVS as I only recently applied a patch against the
python bindings.
---
 Makefile | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

(limited to 'Makefile')

diff --git a/Makefile b/Makefile
index aa1d45bdb7..c50bd04824 100644
--- a/Makefile
+++ b/Makefile
@@ -20,6 +20,10 @@
 # Leave this set to `false' for production use.
 DEBUG = false
 
+# Set the following to `true' to make udev emit a D-BUS signal when a
+# new node is created.
+USE_DBUS = true
+
 
 ROOT =		udev
 VERSION =	008_bk
@@ -34,6 +38,7 @@ etcdir =	${prefix}/etc
 sbindir =	${exec_prefix}/sbin
 mandir =	${prefix}/usr/share/man
 hotplugdir =	${etcdir}/hotplug.d/default
+dbusdir =	${etcdir}/dbus-1/system.d
 configdir =	${etcdir}/udev/
 srcdir = .
 
@@ -138,6 +143,13 @@ endif
 
 CFLAGS += -I$(PWD)/libsysfs
 
+ifeq ($(USE_DBUS), true)
+	CFLAGS += -DUSE_DBUS
+	CFLAGS += $(shell pkg-config --cflags dbus-1)
+	LIB_OBJS += $(shell pkg-config --libs-only-l dbus-1)
+endif
+
+
 all: $(ROOT)
 	@for target in $(EXTRAS) ; do \
 		echo $$target ; \
@@ -240,7 +252,20 @@ small_release: $(DISTFILES) clean
 	@echo "Built $(RELEASE_NAME).tar.gz"
 
 
-install: all
+ifeq ($(USE_DBUS), true)
+install-dbus-policy:
+	$(INSTALL) -d $(DESTDIR)$(dbusdir)
+	$(INSTALL_DATA) udev_sysbus_policy.conf $(DESTDIR)$(dbusdir)
+uninstall-dbus-policy:
+	- rm $(DESTDIR)$(dbusdir)/udev_sysbus_policy.conf
+else
+install-dbus-policy:
+	-
+uninstall-dbus-policy:
+	-
+endif
+
+install: install-dbus-policy all
 	$(INSTALL) -d $(DESTDIR)$(udevdir)
 	$(INSTALL) -d $(DESTDIR)$(configdir)
 	$(INSTALL) -d $(DESTDIR)$(hotplugdir)
@@ -257,7 +282,7 @@ install: all
 			-C $$target $@ ; \
 	done ; \
 
-uninstall:
+uninstall: uninstall-dbus-policy
 	- rm $(hotplugdir)/udev.hotplug
 	- rm $(configdir)/udev.permissions
 	- rm $(configdir)/udev.rules
-- 
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