libports: Create a notify_port in each bucket

This notify port will be used to request & receive Mach notifications.
While it is present in the bucket much like any other port, it is not
counted in ports_count_bucket () and is not exposed to the user
callback in ports_bucket_iterate ().

1 files changed, 13 insertions, 0 deletions

diff --git a/libports/ports.h b/libports/ports.h
index 7295093d..f8ce9b6c 100644
--- a/libports/ports.h
+++ b/libports/ports.h
@@ -80,6 +80,8 @@ struct port_bucket
   int flags;
   int count;
   struct ports_threadpool threadpool;
+  /* A port in this bucket used to receive Mach notifications.  */
+  struct port_info *notify_port;
 };
 /* FLAGS above are the following: */
 #define PORT_BUCKET_INHIBITED	PORTS_INHIBITED
@@ -309,6 +311,17 @@ void ports_port_deref (void *port);
 /* Drop a weak reference to PORT. */
 void ports_port_deref_weak (void *port);
 
+/* Use this port right to request notifications about PORT. */
+#define ports_port_notify_right(port) \
+  ((struct port_info *) (port))->bucket->notify_port->port_right
+
+/* Is PORT the notify port for its bucket? */
+#define ports_port_is_notify(port)                  \
+  ({                                                \
+    struct port_info *__pi = (port);                \
+    __pi ? (__pi->bucket->notify_port == __pi) : 0; \
+  })
+
 /* The user is responsible for listening for no senders notifications;
    when one arrives, call this routine for the PORT the message was
    sent to, providing the MSCOUNT from the notification. */