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>

2 files changed, 3 insertions, 3 deletions

diff --git a/net/filter-mirror.c b/net/filter-mirror.c
index 8d36009c53..d83e815545 100644
--- a/net/filter-mirror.c
+++ b/net/filter-mirror.c
@@ -132,7 +132,7 @@ static void redirector_chr_read(void *opaque, const uint8_t *buf, int size)
     }
 }
 
-static void redirector_chr_event(void *opaque, int event)
+static void redirector_chr_event(void *opaque, QEMUChrEvent event)
 {
     NetFilterState *nf = opaque;
     MirrorState *s = FILTER_REDIRECTOR(nf);
diff --git a/net/vhost-user.c b/net/vhost-user.c
index c54c9c7d4c..17532daaf3 100644
--- a/net/vhost-user.c
+++ b/net/vhost-user.c
@@ -218,7 +218,7 @@ static gboolean net_vhost_user_watch(GIOChannel *chan, GIOCondition cond,
     return TRUE;
 }
 
-static void net_vhost_user_event(void *opaque, int event);
+static void net_vhost_user_event(void *opaque, QEMUChrEvent event);
 
 static void chr_closed_bh(void *opaque)
 {
@@ -249,7 +249,7 @@ static void chr_closed_bh(void *opaque)
     }
 }
 
-static void net_vhost_user_event(void *opaque, int event)
+static void net_vhost_user_event(void *opaque, QEMUChrEvent event)
 {
     const char *name = opaque;
     NetClientState *ncs[MAX_QUEUE_NUM];