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>From c8cb28f0791ab38945c7facb5a63e445b4b6f41f Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Fri, 18 Mar 2011 15:23:21 +0100
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Subject: [PATCH 15/17] chardev: Allow frontends to notify backends of guest open / close
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Some frontends know when the guest has opened the "channel" and is actively
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listening to it, for example virtio-serial. This patch adds 2 new qemu-chardev
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functions which can be used by frontends to signal guest open / close, and
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allows interested backends to listen to this.
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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qemu-char.c | 17 +++++++++++++++++
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qemu-char.h | 4 ++++
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2 files changed, 21 insertions(+), 0 deletions(-)
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diff --git a/qemu-char.c b/qemu-char.c
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index 2ef972f..d52eb51 100644
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--- a/qemu-char.c
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+++ b/qemu-char.c
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@@ -507,6 +507,9 @@ static CharDriverState *qemu_chr_open_mux(CharDriverState *drv)
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chr->chr_write = mux_chr_write;
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chr->chr_update_read_handler = mux_chr_update_read_handler;
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chr->chr_accept_input = mux_chr_accept_input;
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+ /* Frontend guest-open / -close notification is not support with muxes */
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+ chr->chr_guest_open = NULL;
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+ chr->chr_guest_close = NULL;
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/* Muxes are always open on creation */
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qemu_chr_generic_open(chr);
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@@ -2712,6 +2715,20 @@ void qemu_chr_set_echo(struct CharDriverState *chr, bool echo)
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}
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}
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+void qemu_chr_guest_open(struct CharDriverState *chr)
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+{
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+ if (chr->chr_guest_open) {
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+ chr->chr_guest_open(chr);
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+ }
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+}
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+
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+void qemu_chr_guest_close(struct CharDriverState *chr)
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+{
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+ if (chr->chr_guest_close) {
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+ chr->chr_guest_close(chr);
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+ }
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+}
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+
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void qemu_chr_close(CharDriverState *chr)
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{
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QTAILQ_REMOVE(&chardevs, chr, next);
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diff --git a/qemu-char.h b/qemu-char.h
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index bf06da0..f3b9bf4 100644
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--- a/qemu-char.h
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+++ b/qemu-char.h
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@@ -69,6 +69,8 @@ struct CharDriverState {
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void (*chr_close)(struct CharDriverState *chr);
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void (*chr_accept_input)(struct CharDriverState *chr);
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void (*chr_set_echo)(struct CharDriverState *chr, bool echo);
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+ void (*chr_guest_open)(struct CharDriverState *chr);
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+ void (*chr_guest_close)(struct CharDriverState *chr);
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void *opaque;
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QEMUBH *bh;
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char *label;
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@@ -91,6 +93,8 @@ CharDriverState *qemu_chr_open_opts(QemuOpts *opts,
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void (*init)(struct CharDriverState *s));
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CharDriverState *qemu_chr_open(const char *label, const char *filename, void (*init)(struct CharDriverState *s));
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void qemu_chr_set_echo(struct CharDriverState *chr, bool echo);
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+void qemu_chr_guest_open(struct CharDriverState *chr);
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+void qemu_chr_guest_close(struct CharDriverState *chr);
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void qemu_chr_close(CharDriverState *chr);
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void qemu_chr_printf(CharDriverState *s, const char *fmt, ...)
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GCC_FMT_ATTR(2, 3);
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--
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1.7.3.2
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