[PATCH] udevd - switch socket path to abstract namespace

As Chris Friesen <chris_friesen@sympatico.ca> suggested, here we switch
the unix domains socket path to abstract namespace and get rid of the
socket file in the filesystem.

Hey, this was new to me today. So here a few words:
  Linux supports a abstract namespace for sockets. We don't need a
  physical file on the filesystem but only a unique string magically
  starting with the '\0' character.

  strace with real file:
    connect(3, {sa_family=AF_UNIX, path="/udev/.udevd.sock"}, 110)

  strace with abstract namespace:
    connect(3, {sa_family=AF_UNIX, path=@udevd}, 110)

1 files changed, 1 insertions, 0 deletions

diff --git a/udevd.h b/udevd.h
index 6dbee3a295..8efe1d569c 100644
--- a/udevd.h
+++ b/udevd.h
@@ -27,6 +27,7 @@
 #define UDEV_MAGIC			"udevd_" UDEV_VERSION
 #define EVENT_TIMEOUT_SEC		5
 #define UDEVSEND_CONNECT_RETRY		20 /* x 100 millisec */
+#define UDEVD_SOCK_PATH			"udevd"
 
 struct hotplug_msg {
 	char magic[20];