uinput.c

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

#define ACTION_DOWN 1
#define ACTION_UP   0

/* Globals */
int uinp_fd;
struct uinput_user_dev uinp;       // uInput device structure
struct input_event event; // Input device structure
/* Setup the uinput device */
int setup_uinput_device()
{
    // Temporary variable
    int i=0;
    // Open the input device
    uinp_fd = open("/dev/uinput", O_WRONLY | O_NONBLOCK);
    if (uinp_fd<0)
    {
        printf("Unable to open /dev/uinput\n");
        //die("error: open");
        return -1;
    }

    // Setup the uinput device
    if(ioctl(uinp_fd, UI_SET_EVBIT, EV_KEY)<0)
        printf("unable to write");
    if(ioctl(uinp_fd, UI_SET_EVBIT, EV_REL)<0)
        printf("unable to write");
    if(ioctl(uinp_fd, UI_SET_RELBIT, REL_X)<0)
        printf("unable to write");
    if(ioctl(uinp_fd, UI_SET_RELBIT, REL_Y)<0)
        printf("unable to write");
    for (i=0; i < 256; i++) {
        ioctl(uinp_fd, UI_SET_KEYBIT, i);
    }
    //ioctl(uinp_fd, UI_SET_KEYBIT, BTN_MOUSE);
    //ioctl(uinp_fd, UI_SET_KEYBIT, BTN_TOUCH);
    //ioctl(uinp_fd, UI_SET_KEYBIT, BTN_MOUSE);
    //ioctl(uinp_fd, UI_SET_KEYBIT, BTN_LEFT);
    //ioctl(uinp_fd, UI_SET_KEYBIT, BTN_MIDDLE);
    //ioctl(uinp_fd, UI_SET_KEYBIT, BTN_RIGHT);
    //ioctl(uinp_fd, UI_SET_KEYBIT, BTN_FORWARD);
    //ioctl(uinp_fd, UI_SET_KEYBIT, BTN_BACK);


    memset(&uinp,0,sizeof(uinp)); // Intialize the uInput device to NULL
    snprintf(uinp.name, UINPUT_MAX_NAME_SIZE, "uinput-sample");
    uinp.id.bustype = BUS_USB;
    uinp.id.vendor  = 0x1;
    uinp.id.product = 0x1;
    uinp.id.version = 1;

    /* Create input device into input sub-system */
    if(write(uinp_fd, &uinp, sizeof(uinp))< 0)
        printf("Unable to write UINPUT device.");


    if (ioctl(uinp_fd, UI_DEV_CREATE)< 0)
    {
        printf("Unable to create UINPUT device.");
        //die("error: ioctl");
        return -1;
    }
    return 1;

}
void send_click_events( )
{
    // Move pointer to (0,0) location
    memset(&event, 0, sizeof(event));
    gettimeofday(&event.time, NULL);
    event.type = EV_REL;
    event.code = REL_X;
    event.value = 100;
    write(uinp_fd, &event, sizeof(event));
    event.type = EV_REL;
    event.code = REL_Y;
    event.value = 100;
    write(uinp_fd, &event, sizeof(event));
    event.type = EV_SYN;
    event.code = SYN_REPORT;
    event.value = 0;
    write(uinp_fd, &event, sizeof(event));
    // Report BUTTON CLICK - PRESS event
    memset(&event, 0, sizeof(event));
    gettimeofday(&event.time, NULL);
    event.type = EV_KEY;
    event.code = BTN_LEFT;
    event.value = 1;
    write(uinp_fd, &event, sizeof(event));
    event.type = EV_SYN;
    event.code = SYN_REPORT;
    event.value = 0;
    write(uinp_fd, &event, sizeof(event));
    // Report BUTTON CLICK - RELEASE event
    memset(&event, 0, sizeof(event));
    gettimeofday(&event.time, NULL);
    event.type = EV_KEY;
    event.code = BTN_LEFT;
    event.value = 0;
    write(uinp_fd, &event, sizeof(event));
    event.type = EV_SYN;
    event.code = SYN_REPORT;
    event.value = 0;
    write(uinp_fd, &event, sizeof(event));
}

/**
 * send_button
 * key_code
 * is_down
 * Return EXIT_SUCCESS, or EXIT_FAILURE.
 */
int send_keyevent(int key_code, int is_down) {
	int ret;
    // Report BUTTON CLICK - event
    memset(&event, 0, sizeof(event));
    gettimeofday(&event.time, NULL);
    event.type = EV_KEY;
    event.code = key_code;
    event.value = is_down;
    ret = write(uinp_fd, &event, sizeof(event));
    if(ret == -1)
    	goto err;
    event.type = EV_SYN;
    event.code = SYN_REPORT;
    event.value = 0;

    ret = write(uinp_fd, &event, sizeof(event));
    if(ret == -1)
    	goto err;

    return EXIT_SUCCESS;
err:
    return EXIT_FAILURE;
}

void send_a_button()
{
	send_keyevent(KEY_LEFT, ACTION_DOWN);
	send_keyevent(KEY_LEFT, ACTION_UP);
}
/* This function will open the uInput device. Please make
   sure that you have inserted the uinput.ko into kernel. */
int main()
{
    // Return an error if device not found.
    if (setup_uinput_device() < 0)
    {
        printf("Unable to find uinput device\n");
        return -1;
    }
    sleep(1);

    send_a_button();           // Send a "A" key
    // send_click_events();       // Send mouse event
    /* Destroy the input device */
    ioctl(uinp_fd, UI_DEV_DESTROY);
    /* Close the UINPUT device */
    close(uinp_fd);
}