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d2623129a7
The only way object_property_add() can fail is when a property with the same name already exists. Since our property names are all hardcoded, failure is a programming error, and the appropriate way to handle it is passing &error_abort. Same for its variants, except for object_property_add_child(), which additionally fails when the child already has a parent. Parentage is also under program control, so this is a programming error, too. We have a bit over 500 callers. Almost half of them pass &error_abort, slightly fewer ignore errors, one test case handles errors, and the remaining few callers pass them to their own callers. The previous few commits demonstrated once again that ignoring programming errors is a bad idea. Of the few ones that pass on errors, several violate the Error API. The Error ** argument must be NULL, &error_abort, &error_fatal, or a pointer to a variable containing NULL. Passing an argument of the latter kind twice without clearing it in between is wrong: if the first call sets an error, it no longer points to NULL for the second call. ich9_pm_add_properties(), sparc32_ledma_realize(), sparc32_dma_realize(), xilinx_axidma_realize(), xilinx_enet_realize() are wrong that way. When the one appropriate choice of argument is &error_abort, letting users pick the argument is a bad idea. Drop parameter @errp and assert the preconditions instead. There's one exception to "duplicate property name is a programming error": the way object_property_add() implements the magic (and undocumented) "automatic arrayification". Don't drop @errp there. Instead, rename object_property_add() to object_property_try_add(), and add the obvious wrapper object_property_add(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20200505152926.18877-15-armbru@redhat.com> [Two semantic rebase conflicts resolved]
542 lines
15 KiB
C
542 lines
15 KiB
C
/*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* (at your option) any later version. See the COPYING file in the
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* top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/config-file.h"
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#include "qemu/main-loop.h"
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#include "qemu/module.h"
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#include "qemu/sockets.h"
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#include "ui/input.h"
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#include "qom/object_interfaces.h"
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#include "sysemu/iothread.h"
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#include "block/aio.h"
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#include <sys/ioctl.h>
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#include "standard-headers/linux/input.h"
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static bool linux_is_button(unsigned int lnx)
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{
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if (lnx < 0x100) {
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return false;
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}
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if (lnx >= 0x160 && lnx < 0x2c0) {
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return false;
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}
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return true;
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}
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#define TYPE_INPUT_LINUX "input-linux"
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#define INPUT_LINUX(obj) \
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OBJECT_CHECK(InputLinux, (obj), TYPE_INPUT_LINUX)
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#define INPUT_LINUX_GET_CLASS(obj) \
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OBJECT_GET_CLASS(InputLinuxClass, (obj), TYPE_INPUT_LINUX)
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#define INPUT_LINUX_CLASS(klass) \
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OBJECT_CLASS_CHECK(InputLinuxClass, (klass), TYPE_INPUT_LINUX)
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typedef struct InputLinux InputLinux;
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typedef struct InputLinuxClass InputLinuxClass;
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struct InputLinux {
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Object parent;
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char *evdev;
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int fd;
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bool repeat;
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bool grab_request;
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bool grab_active;
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bool grab_all;
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bool keydown[KEY_CNT];
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int keycount;
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int wheel;
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bool initialized;
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bool has_rel_x;
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bool has_abs_x;
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int num_keys;
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int num_btns;
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int abs_x_min;
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int abs_x_max;
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int abs_y_min;
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int abs_y_max;
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struct input_event event;
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int read_offset;
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enum GrabToggleKeys grab_toggle;
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QTAILQ_ENTRY(InputLinux) next;
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};
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struct InputLinuxClass {
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ObjectClass parent_class;
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};
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static QTAILQ_HEAD(, InputLinux) inputs = QTAILQ_HEAD_INITIALIZER(inputs);
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static void input_linux_toggle_grab(InputLinux *il)
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{
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intptr_t request = !il->grab_active;
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InputLinux *item;
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int rc;
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rc = ioctl(il->fd, EVIOCGRAB, request);
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if (rc < 0) {
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return;
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}
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il->grab_active = !il->grab_active;
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if (!il->grab_all) {
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return;
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}
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QTAILQ_FOREACH(item, &inputs, next) {
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if (item == il || item->grab_all) {
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/* avoid endless loops */
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continue;
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}
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if (item->grab_active != il->grab_active) {
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input_linux_toggle_grab(item);
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}
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}
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}
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static bool input_linux_check_toggle(InputLinux *il)
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{
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switch (il->grab_toggle) {
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case GRAB_TOGGLE_KEYS_CTRL_CTRL:
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return il->keydown[KEY_LEFTCTRL] &&
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il->keydown[KEY_RIGHTCTRL];
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case GRAB_TOGGLE_KEYS_ALT_ALT:
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return il->keydown[KEY_LEFTALT] &&
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il->keydown[KEY_RIGHTALT];
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case GRAB_TOGGLE_KEYS_SHIFT_SHIFT:
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return il->keydown[KEY_LEFTSHIFT] &&
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il->keydown[KEY_RIGHTSHIFT];
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case GRAB_TOGGLE_KEYS_META_META:
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return il->keydown[KEY_LEFTMETA] &&
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il->keydown[KEY_RIGHTMETA];
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case GRAB_TOGGLE_KEYS_SCROLLLOCK:
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return il->keydown[KEY_SCROLLLOCK];
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case GRAB_TOGGLE_KEYS_CTRL_SCROLLLOCK:
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return (il->keydown[KEY_LEFTCTRL] ||
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il->keydown[KEY_RIGHTCTRL]) &&
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il->keydown[KEY_SCROLLLOCK];
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case GRAB_TOGGLE_KEYS__MAX:
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/* avoid gcc error */
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break;
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}
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return false;
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}
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static bool input_linux_should_skip(InputLinux *il,
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struct input_event *event)
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{
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return (il->grab_toggle == GRAB_TOGGLE_KEYS_SCROLLLOCK ||
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il->grab_toggle == GRAB_TOGGLE_KEYS_CTRL_SCROLLLOCK) &&
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event->code == KEY_SCROLLLOCK;
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}
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static void input_linux_handle_keyboard(InputLinux *il,
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struct input_event *event)
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{
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if (event->type == EV_KEY) {
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if (event->value > 2 || (event->value > 1 && !il->repeat)) {
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/*
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* ignore autorepeat + unknown key events
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* 0 == up, 1 == down, 2 == autorepeat, other == undefined
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*/
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return;
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}
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if (event->code >= KEY_CNT) {
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/*
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* Should not happen. But better safe than sorry,
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* and we make Coverity happy too.
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*/
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return;
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}
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/* keep track of key state */
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if (!il->keydown[event->code] && event->value) {
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il->keydown[event->code] = true;
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il->keycount++;
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}
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if (il->keydown[event->code] && !event->value) {
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il->keydown[event->code] = false;
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il->keycount--;
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}
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/* send event to guest when grab is active */
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if (il->grab_active && !input_linux_should_skip(il, event)) {
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int qcode = qemu_input_linux_to_qcode(event->code);
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qemu_input_event_send_key_qcode(NULL, qcode, event->value);
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}
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/* hotkey -> record switch request ... */
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if (input_linux_check_toggle(il)) {
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il->grab_request = true;
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}
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/*
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* ... and do the switch when all keys are lifted, so we
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* confuse neither guest nor host with keys which seem to
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* be stuck due to missing key-up events.
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*/
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if (il->grab_request && !il->keycount) {
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il->grab_request = false;
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input_linux_toggle_grab(il);
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}
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}
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}
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static void input_linux_event_mouse_button(int button)
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{
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qemu_input_queue_btn(NULL, button, true);
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qemu_input_event_sync();
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qemu_input_queue_btn(NULL, button, false);
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qemu_input_event_sync();
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}
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static void input_linux_handle_mouse(InputLinux *il, struct input_event *event)
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{
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if (!il->grab_active) {
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return;
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}
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switch (event->type) {
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case EV_KEY:
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switch (event->code) {
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case BTN_LEFT:
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qemu_input_queue_btn(NULL, INPUT_BUTTON_LEFT, event->value);
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break;
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case BTN_RIGHT:
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qemu_input_queue_btn(NULL, INPUT_BUTTON_RIGHT, event->value);
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break;
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case BTN_MIDDLE:
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qemu_input_queue_btn(NULL, INPUT_BUTTON_MIDDLE, event->value);
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break;
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case BTN_GEAR_UP:
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qemu_input_queue_btn(NULL, INPUT_BUTTON_WHEEL_UP, event->value);
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break;
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case BTN_GEAR_DOWN:
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qemu_input_queue_btn(NULL, INPUT_BUTTON_WHEEL_DOWN,
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event->value);
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break;
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case BTN_SIDE:
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qemu_input_queue_btn(NULL, INPUT_BUTTON_SIDE, event->value);
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break;
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case BTN_EXTRA:
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qemu_input_queue_btn(NULL, INPUT_BUTTON_EXTRA, event->value);
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break;
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};
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break;
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case EV_REL:
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switch (event->code) {
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case REL_X:
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qemu_input_queue_rel(NULL, INPUT_AXIS_X, event->value);
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break;
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case REL_Y:
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qemu_input_queue_rel(NULL, INPUT_AXIS_Y, event->value);
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break;
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case REL_WHEEL:
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il->wheel = event->value;
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break;
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}
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break;
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case EV_ABS:
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switch (event->code) {
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case ABS_X:
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qemu_input_queue_abs(NULL, INPUT_AXIS_X, event->value,
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il->abs_x_min, il->abs_x_max);
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break;
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case ABS_Y:
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qemu_input_queue_abs(NULL, INPUT_AXIS_Y, event->value,
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il->abs_y_min, il->abs_y_max);
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break;
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}
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break;
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case EV_SYN:
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qemu_input_event_sync();
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if (il->wheel != 0) {
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input_linux_event_mouse_button((il->wheel > 0)
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? INPUT_BUTTON_WHEEL_UP
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: INPUT_BUTTON_WHEEL_DOWN);
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il->wheel = 0;
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}
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break;
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}
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}
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static void input_linux_event(void *opaque)
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{
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InputLinux *il = opaque;
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int rc;
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int read_size;
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uint8_t *p = (uint8_t *)&il->event;
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for (;;) {
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read_size = sizeof(il->event) - il->read_offset;
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rc = read(il->fd, &p[il->read_offset], read_size);
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if (rc != read_size) {
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if (rc < 0 && errno != EAGAIN) {
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fprintf(stderr, "%s: read: %s\n", __func__, strerror(errno));
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qemu_set_fd_handler(il->fd, NULL, NULL, NULL);
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close(il->fd);
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} else if (rc > 0) {
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il->read_offset += rc;
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}
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break;
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}
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il->read_offset = 0;
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if (il->num_keys) {
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input_linux_handle_keyboard(il, &il->event);
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}
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if ((il->has_rel_x || il->has_abs_x) && il->num_btns) {
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input_linux_handle_mouse(il, &il->event);
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}
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}
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}
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static void input_linux_complete(UserCreatable *uc, Error **errp)
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{
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InputLinux *il = INPUT_LINUX(uc);
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uint8_t evtmap, relmap, absmap;
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uint8_t keymap[KEY_CNT / 8], keystate[KEY_CNT / 8];
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unsigned int i;
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int rc, ver;
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struct input_absinfo absinfo;
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if (!il->evdev) {
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error_setg(errp, "no input device specified");
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return;
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}
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il->fd = open(il->evdev, O_RDWR);
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if (il->fd < 0) {
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error_setg_file_open(errp, errno, il->evdev);
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return;
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}
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qemu_set_nonblock(il->fd);
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rc = ioctl(il->fd, EVIOCGVERSION, &ver);
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if (rc < 0) {
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error_setg(errp, "%s: is not an evdev device", il->evdev);
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goto err_close;
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}
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rc = ioctl(il->fd, EVIOCGBIT(0, sizeof(evtmap)), &evtmap);
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if (rc < 0) {
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goto err_read_event_bits;
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}
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if (evtmap & (1 << EV_REL)) {
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relmap = 0;
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rc = ioctl(il->fd, EVIOCGBIT(EV_REL, sizeof(relmap)), &relmap);
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if (rc < 0) {
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goto err_read_event_bits;
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}
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if (relmap & (1 << REL_X)) {
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il->has_rel_x = true;
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}
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}
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if (evtmap & (1 << EV_ABS)) {
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absmap = 0;
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rc = ioctl(il->fd, EVIOCGBIT(EV_ABS, sizeof(absmap)), &absmap);
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if (rc < 0) {
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goto err_read_event_bits;
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}
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if (absmap & (1 << ABS_X)) {
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il->has_abs_x = true;
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rc = ioctl(il->fd, EVIOCGABS(ABS_X), &absinfo);
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if (rc < 0) {
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error_setg(errp, "%s: failed to get get absolute X value",
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il->evdev);
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goto err_close;
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}
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il->abs_x_min = absinfo.minimum;
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il->abs_x_max = absinfo.maximum;
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rc = ioctl(il->fd, EVIOCGABS(ABS_Y), &absinfo);
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if (rc < 0) {
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error_setg(errp, "%s: failed to get get absolute Y value",
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il->evdev);
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goto err_close;
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}
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il->abs_y_min = absinfo.minimum;
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il->abs_y_max = absinfo.maximum;
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}
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}
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if (evtmap & (1 << EV_KEY)) {
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memset(keymap, 0, sizeof(keymap));
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rc = ioctl(il->fd, EVIOCGBIT(EV_KEY, sizeof(keymap)), keymap);
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if (rc < 0) {
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goto err_read_event_bits;
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}
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rc = ioctl(il->fd, EVIOCGKEY(sizeof(keystate)), keystate);
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if (rc < 0) {
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error_setg(errp, "%s: failed to get global key state", il->evdev);
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goto err_close;
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}
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for (i = 0; i < KEY_CNT; i++) {
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if (keymap[i / 8] & (1 << (i % 8))) {
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if (linux_is_button(i)) {
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il->num_btns++;
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} else {
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il->num_keys++;
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}
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if (keystate[i / 8] & (1 << (i % 8))) {
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il->keydown[i] = true;
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il->keycount++;
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}
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}
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}
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}
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qemu_set_fd_handler(il->fd, input_linux_event, NULL, il);
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if (il->keycount) {
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/* delay grab until all keys are released */
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il->grab_request = true;
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} else {
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input_linux_toggle_grab(il);
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}
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QTAILQ_INSERT_TAIL(&inputs, il, next);
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il->initialized = true;
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return;
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err_read_event_bits:
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error_setg(errp, "%s: failed to read event bits", il->evdev);
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err_close:
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close(il->fd);
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return;
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}
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static void input_linux_instance_finalize(Object *obj)
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{
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InputLinux *il = INPUT_LINUX(obj);
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if (il->initialized) {
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QTAILQ_REMOVE(&inputs, il, next);
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close(il->fd);
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}
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g_free(il->evdev);
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}
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static char *input_linux_get_evdev(Object *obj, Error **errp)
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{
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InputLinux *il = INPUT_LINUX(obj);
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return g_strdup(il->evdev);
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}
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static void input_linux_set_evdev(Object *obj, const char *value,
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Error **errp)
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{
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InputLinux *il = INPUT_LINUX(obj);
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if (il->evdev) {
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error_setg(errp, "evdev property already set");
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return;
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}
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il->evdev = g_strdup(value);
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}
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static bool input_linux_get_grab_all(Object *obj, Error **errp)
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{
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InputLinux *il = INPUT_LINUX(obj);
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return il->grab_all;
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}
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static void input_linux_set_grab_all(Object *obj, bool value,
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Error **errp)
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{
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InputLinux *il = INPUT_LINUX(obj);
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il->grab_all = value;
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}
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static bool input_linux_get_repeat(Object *obj, Error **errp)
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{
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InputLinux *il = INPUT_LINUX(obj);
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return il->repeat;
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}
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static void input_linux_set_repeat(Object *obj, bool value,
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Error **errp)
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{
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InputLinux *il = INPUT_LINUX(obj);
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il->repeat = value;
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}
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static int input_linux_get_grab_toggle(Object *obj, Error **errp)
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{
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InputLinux *il = INPUT_LINUX(obj);
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return il->grab_toggle;
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}
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static void input_linux_set_grab_toggle(Object *obj, int value,
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Error **errp)
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{
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InputLinux *il = INPUT_LINUX(obj);
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|
|
il->grab_toggle = value;
|
|
}
|
|
|
|
static void input_linux_instance_init(Object *obj)
|
|
{
|
|
object_property_add_str(obj, "evdev",
|
|
input_linux_get_evdev,
|
|
input_linux_set_evdev);
|
|
object_property_add_bool(obj, "grab_all",
|
|
input_linux_get_grab_all,
|
|
input_linux_set_grab_all);
|
|
object_property_add_bool(obj, "repeat",
|
|
input_linux_get_repeat,
|
|
input_linux_set_repeat);
|
|
object_property_add_enum(obj, "grab-toggle", "GrabToggleKeys",
|
|
&GrabToggleKeys_lookup,
|
|
input_linux_get_grab_toggle,
|
|
input_linux_set_grab_toggle);
|
|
}
|
|
|
|
static void input_linux_class_init(ObjectClass *oc, void *data)
|
|
{
|
|
UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
|
|
|
|
ucc->complete = input_linux_complete;
|
|
}
|
|
|
|
static const TypeInfo input_linux_info = {
|
|
.name = TYPE_INPUT_LINUX,
|
|
.parent = TYPE_OBJECT,
|
|
.class_size = sizeof(InputLinuxClass),
|
|
.class_init = input_linux_class_init,
|
|
.instance_size = sizeof(InputLinux),
|
|
.instance_init = input_linux_instance_init,
|
|
.instance_finalize = input_linux_instance_finalize,
|
|
.interfaces = (InterfaceInfo[]) {
|
|
{ TYPE_USER_CREATABLE },
|
|
{ }
|
|
}
|
|
};
|
|
|
|
static void register_types(void)
|
|
{
|
|
type_register_static(&input_linux_info);
|
|
}
|
|
|
|
type_init(register_types);
|