>From c8cb28f0791ab38945c7facb5a63e445b4b6f41f Mon Sep 17 00:00:00 2001 From: Hans de Goede 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 --- 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