First go at session management. Not asking review since

it's a bunch of ugly C code imported from gnome-session.
Will clean it up a bit but I don't plan to make it too shiny :)

src/sugar/_sugarext.defs

@@ -36,6 +36,27 @@
   (gtype-id "SEXY_TYPE_ICON_ENTRY")
 )
 
+(define-object SMClientXSMP
+  (in-module "Egg")
+  (parent "EggSMClient")
+  (c-name "EggSMClientXSMP")
+  (gtype-id "EGG_TYPE_SM_CLIENT_XSMP")
+)
+
+(define-object SMClient
+  (in-module "Egg")
+  (parent "GObject")
+  (c-name "EggSMClient")
+  (gtype-id "EGG_TYPE_SM_CLIENT")
+)
+
+(define-object Session
+  (in-module "Gsm")
+  (parent "GObject")
+  (c-name "GsmSession")
+  (gtype-id "GSM_TYPE_SESSION")
+)
+
 ;; Enumerations and flags ...
 
 (define-enum IconEntryPosition
@@ -194,3 +215,123 @@
   (c-name "sugar_preview_get_pixbuf")
   (return-type "GdkPixbuf*")
 )
+
+;; From eggsmclient.h
+
+(define-function egg_sm_client_get_type
+  (c-name "egg_sm_client_get_type")
+  (return-type "GType")
+)
+
+(define-function egg_sm_client_get_option_group
+  (c-name "egg_sm_client_get_option_group")
+  (return-type "GOptionGroup*")
+)
+
+(define-method is_resumed
+  (of-object "EggSMClient")
+  (c-name "egg_sm_client_is_resumed")
+  (return-type "gboolean")
+)
+
+(define-method get_state_file
+  (of-object "EggSMClient")
+  (c-name "egg_sm_client_get_state_file")
+  (return-type "GKeyFile*")
+)
+
+(define-method set_restart_command
+  (of-object "EggSMClient")
+  (c-name "egg_sm_client_set_restart_command")
+  (return-type "none")
+  (parameters
+    '("int" "argc")
+    '("const-char**" "argv")
+  )
+)
+
+(define-method startup
+  (of-object "EggSMClient")
+  (c-name "egg_sm_client_startup")
+  (return-type "none")
+)
+
+(define-method will_quit
+  (of-object "EggSMClient")
+  (c-name "egg_sm_client_will_quit")
+  (return-type "none")
+  (parameters
+    '("gboolean" "will_quit")
+  )
+)
+
+(define-function egg_sm_client_end_session
+  (c-name "egg_sm_client_end_session")
+  (return-type "gboolean")
+  (parameters
+    '("EggSMClientEndStyle" "style")
+    '("gboolean" "request_confirmation")
+  )
+)
+
+;; From xsmp.h
+
+(define-function xsmp_init
+  (c-name "gsm_xsmp_init")
+  (return-type "char*")
+)
+
+(define-function xsmp_run
+  (c-name "gsm_xsmp_run")
+  (return-type "none")
+)
+
+(define-function xsmp_shutdown
+  (c-name "gsm_xsmp_shutdown")
+  (return-type "none")
+)
+
+;; From session.h
+
+(define-method set_name
+  (of-object "GsmSession")
+  (c-name "gsm_session_set_name")
+  (return-type "none")
+  (parameters
+    '("const-char*" "name")
+  )
+)
+
+(define-method start
+  (of-object "GsmSession")
+  (c-name "gsm_session_start")
+  (return-type "none")
+)
+
+(define-method get_phase
+  (of-object "GsmSession")
+  (c-name "gsm_session_get_phase")
+  (return-type "GsmSessionPhase")
+)
+
+(define-method initiate_shutdown
+  (of-object "GsmSession")
+  (c-name "gsm_session_initiate_shutdown")
+  (return-type "none")
+)
+
+(define-method register_client
+  (of-object "GsmSession")
+  (c-name "gsm_session_register_client")
+  (return-type "char*")
+  (parameters
+    '("GsmClient*" "client")
+    '("const-char*" "previous_id")
+  )
+)
+
+(define-function session_create_global
+  (c-name "gsm_session_create_global")
+  (return-type "GsmSession*")
+)
+