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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
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>
Reviewed-by: Alon Levy <alevy@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
This commit is contained in:
Hans de Goede 2011-03-24 11:12:02 +01:00 committed by Amit Shah
parent a7d3970d06
commit 7c32c4feeb
2 changed files with 21 additions and 0 deletions
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17
qemu-char.c
View file

@ -480,6 +480,9 @@ 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);
@ -2579,6 +2582,20 @@ 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);

4
qemu-char.h
View file

@ -65,6 +65,8 @@ 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;
@ -79,6 +81,8 @@ 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);