>From c8cb28f0791ab38945c7facb5a63e445b4b6f41f Mon Sep 17 00:00:00 2001

From: Hans de Goede <hdegoede@redhat.com>

Date: Fri, 18 Mar 2011 15:23:21 +0100

Subject: [PATCH 15/17] chardev: Allow frontends to notify backends of guest open / close

Some frontends know when the guest has opened the "channel" and is actively

listening to it, for example virtio-serial. This patch adds 2 new qemu-chardev

functions which can be used by frontends to signal guest open / close, and

allows interested backends to listen to this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

---

 qemu-char.c |   17 +++++++++++++++++

 qemu-char.h |    4 ++++

 2 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/qemu-char.c b/qemu-char.c

index 2ef972f..d52eb51 100644

--- a/qemu-char.c

+++ b/qemu-char.c

@@ -507,6 +507,9 @@ static CharDriverState *qemu_chr_open_mux(CharDriverState *drv)

     chr->chr_write = mux_chr_write;

     chr->chr_update_read_handler = mux_chr_update_read_handler;

     chr->chr_accept_input = mux_chr_accept_input;

+    /* Frontend guest-open / -close notification is not support with muxes */

+    chr->chr_guest_open = NULL;

+    chr->chr_guest_close = NULL;

     /* Muxes are always open on creation */

     qemu_chr_generic_open(chr);

@@ -2712,6 +2715,20 @@ void qemu_chr_set_echo(struct CharDriverState *chr, bool echo)

     }

 }

+void qemu_chr_guest_open(struct CharDriverState *chr)

+{

+    if (chr->chr_guest_open) {

+        chr->chr_guest_open(chr);

+    }

+}

+

+void qemu_chr_guest_close(struct CharDriverState *chr)

+{

+    if (chr->chr_guest_close) {

+        chr->chr_guest_close(chr);

+    }

+}

+

 void qemu_chr_close(CharDriverState *chr)

 {

     QTAILQ_REMOVE(&chardevs, chr, next);

diff --git a/qemu-char.h b/qemu-char.h

index bf06da0..f3b9bf4 100644

--- a/qemu-char.h

+++ b/qemu-char.h

@@ -69,6 +69,8 @@ struct CharDriverState {

     void (*chr_close)(struct CharDriverState *chr);

     void (*chr_accept_input)(struct CharDriverState *chr);

     void (*chr_set_echo)(struct CharDriverState *chr, bool echo);

+    void (*chr_guest_open)(struct CharDriverState *chr);

+    void (*chr_guest_close)(struct CharDriverState *chr);

     void *opaque;

     QEMUBH *bh;

     char *label;

@@ -91,6 +93,8 @@ CharDriverState *qemu_chr_open_opts(QemuOpts *opts,

                                     void (*init)(struct CharDriverState *s));

 CharDriverState *qemu_chr_open(const char *label, const char *filename, void (*init)(struct CharDriverState *s));

 void qemu_chr_set_echo(struct CharDriverState *chr, bool echo);

+void qemu_chr_guest_open(struct CharDriverState *chr);

+void qemu_chr_guest_close(struct CharDriverState *chr);

 void qemu_chr_close(CharDriverState *chr);

 void qemu_chr_printf(CharDriverState *s, const char *fmt, ...)

     GCC_FMT_ATTR(2, 3);

-- 

1.7.3.2