strange uinput behavior

[Jon Oberheide <jon@xxxxxxxxxxxxx>]

I'm observing some strange behavior with xorg and uinput.

Attached is a simple testcase that creates a uinput device and sends a
KEY_ENTER event.  In bad.c, when the device is only set up with a
KEY_ENTER key, the KEY_ENTER event is not observed in X.  However, in
good.c, if another supported key (say KEY_A) is added to the uinput
device as well, the sending of the KEY_ENTER event works just fine.

Both of the testcases work as expected outside of X in the terminal
which leads to me to believe something is getting munged in X's input
layer.

--- bad.c       2008-08-21 19:06:20.000000000 -0400
+++ good.c      2008-08-21 19:02:34.000000000 -0400
@@ -26,6 +26,7 @@
     dev.id.bustype = BUS_USB;
 
     ioctl(fd, UI_SET_EVBIT, EV_KEY);
+    ioctl(fd, UI_SET_KEYBIT, KEY_A);
     ioctl(fd, UI_SET_KEYBIT, KEY_ENTER);
     write(fd, &dev, sizeof(dev));

This strageness is observable on Ubuntu Intrepid (xorg
(1:7.4~1ubuntu1)), but works as expected on Ubuntu Hardy (xorg (1:7.3
+10ubuntu10)).

Regards,
Jon Oberheide

-- 
Jon Oberheide <jon@xxxxxxxxxxxxx>
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#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/input.h>
#include <linux/uinput.h>

int
main(void)
{
    int fd;
    struct input_event event;
    struct uinput_user_dev dev;

    fd = open("/dev/input/uinput", O_WRONLY | O_NDELAY);
    if (!fd) {
        printf("unable to open /dev/input/uinput\n");
        return 1;
    }

    memset(&dev, 0, sizeof(dev));
    strncpy(dev.name, "Test Device", UINPUT_MAX_NAME_SIZE);
    dev.id.version = 4;
    dev.id.bustype = BUS_USB;

    ioctl(fd, UI_SET_EVBIT, EV_KEY);
    ioctl(fd, UI_SET_KEYBIT, KEY_ENTER);
    write(fd, &dev, sizeof(dev));
       
	if (ioctl(fd, UI_DEV_CREATE)) {
        printf("unable to create device\n");
        return 1;
    }

    printf("device created...\n");
    sleep(5);
    printf("sending KEY_ENTER event...\n");

    memset(&event, 0, sizeof(event));
    event.type = EV_KEY;
    event.code = KEY_ENTER;

    event.value = 1;
    write(fd, &event, sizeof(event));

    event.value = 0;
    write(fd, &event, sizeof(event));

    ioctl(fd, UI_DEV_DESTROY);
    close(fd);

    return 0;
}

#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/input.h>
#include <linux/uinput.h>

int
main(void)
{
    int fd;
    struct input_event event;
    struct uinput_user_dev dev;

    fd = open("/dev/input/uinput", O_WRONLY | O_NDELAY);
    if (!fd) {
        printf("unable to open /dev/input/uinput\n");
        return 1;
    }

    memset(&dev, 0, sizeof(dev));
    strncpy(dev.name, "Test Device", UINPUT_MAX_NAME_SIZE);
    dev.id.version = 4;
    dev.id.bustype = BUS_USB;

    ioctl(fd, UI_SET_EVBIT, EV_KEY);
    ioctl(fd, UI_SET_KEYBIT, KEY_A);
    ioctl(fd, UI_SET_KEYBIT, KEY_ENTER);
    write(fd, &dev, sizeof(dev));
       
	if (ioctl(fd, UI_DEV_CREATE)) {
        printf("unable to create device\n");
        return 1;
    }

    printf("device created...\n");
    sleep(5);
    printf("sending KEY_ENTER event...\n");

    memset(&event, 0, sizeof(event));
    event.type = EV_KEY;
    event.code = KEY_ENTER;

    event.value = 1;
    write(fd, &event, sizeof(event));

    event.value = 0;
    write(fd, &event, sizeof(event));

    ioctl(fd, UI_DEV_DESTROY);
    close(fd);

    return 0;
}

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