chardev: Use QEMUChrEvent enum in IOEventHandler typedef

The Chardev events are listed in the QEMUChrEvent enum.

By using the enum in the IOEventHandler typedef we:

- make the IOEventHandler type more explicit (this handler
  process out-of-band information, while the IOReadHandler
  is in-band),
- help static code analyzers.

This patch was produced with the following spatch script:

  @match@
  expression backend, opaque, context, set_open;
  identifier fd_can_read, fd_read, fd_event, be_change;
  @@
  qemu_chr_fe_set_handlers(backend, fd_can_read, fd_read, fd_event,
                           be_change, opaque, context, set_open);

  @depends on match@
  identifier opaque, event;
  identifier match.fd_event;
  @@
   static
  -void fd_event(void *opaque, int event)
  +void fd_event(void *opaque, QEMUChrEvent event)
   {
   ...
   }

Then the typedef was modified manually in
include/chardev/char-fe.h.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: Corey Minyard <cminyard@mvista.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20191218172009.8868-15-philmd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/chardev/char-fe.h b/include/chardev/char-fe.h
index 67601dc..a553843 100644
--- a/include/chardev/char-fe.h
+++ b/include/chardev/char-fe.h
@@ -4,7 +4,7 @@
 #include "chardev/char.h"
 #include "qemu/main-loop.h"
 
-typedef void IOEventHandler(void *opaque, int event);
+typedef void IOEventHandler(void *opaque, QEMUChrEvent event);
 typedef int BackendChangeHandler(void *opaque);
 
 /* This is the backend as seen by frontend, the actual backend is