qemu-char: Automatically do fe_open / fe_close on qemu_chr_add_handlers

Most frontends can't really determine if the guest actually has the frontend
side open. So lets automatically generate fe_open / fe_close as soon as a
frontend becomes ready (as signalled by calling qemu_chr_add_handlers) /
becomes non ready (as signalled by setting all handlers to NULL).

And allow frontends which can actually determine if the guest is listening to
opt-out of this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Message-id: 1364292483-16564-5-git-send-email-hdegoede@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/char/char.h b/include/char/char.h
index dbb1b89f8c..3cd2aef77d 100644
--- a/include/char/char.h
+++ b/include/char/char.h
@@ -76,6 +76,7 @@ struct CharDriverState {
     char *filename;
     int be_open;
     int fe_open;
+    int explicit_fe_open;
     int avail_connections;
     QemuOpts *opts;
     QTAILQ_ENTRY(CharDriverState) next;