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input-linux: add option to toggle grab on all devices 

Maintain a list of all input devices.  Add an option to make grab
work across all devices (so toggling grab on the keybard can switch
over the mouse too).

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 1457087116-4379-3-git-send-email-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2016-03-04 11:25:15 +01:00
parent e0d2bd5195
commit 46d921bebe
1 changed files with 29 additions and 0 deletions
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29
ui/input-linux.c
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@ -134,14 +134,19 @@ struct InputLinux {
int fd;
bool grab_request;
bool grab_active;
bool grab_all;
bool keydown[KEY_CNT];
int keycount;
int wheel;
QTAILQ_ENTRY(InputLinux) next;
};
static QTAILQ_HEAD(, InputLinux) inputs = QTAILQ_HEAD_INITIALIZER(inputs);
static void input_linux_toggle_grab(InputLinux *il)
{
intptr_t request = !il->grab_active;
InputLinux *item;
int rc;
rc = ioctl(il->fd, EVIOCGRAB, request);
@ -149,6 +154,19 @@ static void input_linux_toggle_grab(InputLinux *il)
return;
}
il->grab_active = !il->grab_active;
if (!il->grab_all) {
return;
}
QTAILQ_FOREACH(item, &inputs, next) {
if (item == il || item->grab_all) {
/* avoid endless loops */
continue;
}
if (item->grab_active != il->grab_active) {
input_linux_toggle_grab(item);
}
}
}
static void input_linux_event_keyboard(void *opaque)
@ -238,6 +256,11 @@ static void input_linux_event_mouse(void *opaque)
break;
}
/* only send event to guest when grab is active */
if (!il->grab_active) {
continue;
}
switch (event.type) {
case EV_KEY:
switch (event.code) {
@ -292,6 +315,8 @@ int input_linux_init(void *opaque, QemuOpts *opts, Error **errp)
int rc, ver;
il->evdev = qemu_opt_get(opts, "evdev");
il->grab_all = qemu_opt_get_bool(opts, "grab-all", false);
if (!il->evdev) {
error_setg(errp, "no input device specified");
goto err_free;
@ -328,6 +353,7 @@ int input_linux_init(void *opaque, QemuOpts *opts, Error **errp)
goto err_close;
}
input_linux_toggle_grab(il);
QTAILQ_INSERT_TAIL(&inputs, il, next);
return 0;
err_close:
@ -345,6 +371,9 @@ static QemuOptsList qemu_input_linux_opts = {
{
.name = "evdev",
.type = QEMU_OPT_STRING,
},{
.name = "grab-all",
.type = QEMU_OPT_BOOL,
},
{ /* end of list */ }
},