char: move backends' io watch tag to CharDriverState

All the backends implement an io watcher tag for callbacks.  Move it to
CharDriverState from each backend's struct to make accessing the tag from
backend-neutral functions easier.

This will be used later to cancel a callback on chardev detach from a
frontend.

CC: <qemu-stable@nongnu.org>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/sysemu/char.h b/include/sysemu/char.h
index 8053130a97..ad101d9258 100644
--- a/include/sysemu/char.h
+++ b/include/sysemu/char.h
@@ -78,6 +78,7 @@ struct CharDriverState {
     int explicit_be_open;
     int avail_connections;
     int is_mux;
+    guint fd_in_tag;
     QemuOpts *opts;
     QTAILQ_ENTRY(CharDriverState) next;
 };