Allow devices be notified of link status change (Mark McLoughlin)

Signed-off-by: NMark McLoughlin <markmc@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6248 c046a42c-6fe2-441c-8c8c-71466251a162

net.c

@@ -1718,6 +1718,9 @@ int do_set_link(const char *name, const char *up_or_down)
         term_printf("invalid link status '%s'; only 'up' or 'down' valid\n",
                     up_or_down);
 
+    if (vc->link_status_changed)
+        vc->link_status_changed(vc);
+
     return 1;
 }
 

net.h

@@ -9,12 +9,15 @@ typedef ssize_t (IOReadvHandler)(void *, const struct iovec *, int);
 
 typedef struct VLANClientState VLANClientState;
 
+typedef void (LinkStatusChanged)(VLANClientState *);
+
 struct VLANClientState {
     IOReadHandler *fd_read;
     IOReadvHandler *fd_readv;
     /* Packets may still be sent if this returns zero.  It's used to
        rate-limit the slirp code.  */
     IOCanRWHandler *fd_can_read;
+    LinkStatusChanged *link_status_changed;
     int link_down;
     void *opaque;
     struct VLANClientState *next;