uinput使用示例

uinput示例，编译好后运行，10秒内打开空白文本文件，10秒后会在文本文件里输入“l”字符。

示例源码：

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

#define KEY_CUSTOM_UP 0x20
#define KEY_CUSTOM_DOWN 0x30


static struct uinput_user_dev uinput_dev;
static int uinput_fd;

int creat_user_uinput(void);
int report_key(unsigned int type, unsigned int keycode, unsigned int value);


static void sleep_ms(unsigned int secs)
{
	struct timeval tval;
	
	tval.tv_sec=secs/1000;
	tval.tv_usec=(secs*1000)%1000000;
	select(0,NULL,NULL,NULL,&tval);
}

int main(int argc, char *argv[])
{
	int ret = 0;
	int i;
	for(i=0;i<1000;i++){
		sleep_ms(10);
		if(i%100 == 0)
		printf("=%d=\n", i);
	}
	
	ret = creat_user_uinput();
	if(ret < 0){
		printf("%s:%d\n", __func__, __LINE__);
		return -1;//error process.
	}
	
	sleep(10);// help you to 'hexdump -C /dev/input/event[X]' for test.
	
	report_key(EV_KEY, KEY_L, 1);// Report BUTTON A CLICK - PRESS event
	report_key(EV_KEY, KEY_L, 0);// Report BUTTON A CLICK - RELEASE event
	
	//report_key(EV_KEY, KEY_CUSTOM_UP, 12);
	//report_key(EV_KEY, KEY_CUSTOM_UP, 0);
	
	sleep(5);
	close(uinput_fd);
	return 0;
}


int creat_user_uinput(void)
{
	int i;
	int ret = 0;
	
	uinput_fd = open("/dev/uinput", O_RDWR | O_NDELAY);
	if(uinput_fd < 0){
		printf("%s:%d\n", __func__, __LINE__);
		return -1;//error process.
	}
	
	//to set uinput dev
	memset(&uinput_dev, 0, sizeof(struct uinput_user_dev));
	snprintf(uinput_dev.name, UINPUT_MAX_NAME_SIZE, "uinput-custom-dev");
	uinput_dev.id.version = 1;
	uinput_dev.id.bustype = BUS_VIRTUAL;
	
	ioctl(uinput_fd, UI_SET_EVBIT, EV_SYN);
	ioctl(uinput_fd, UI_SET_EVBIT, EV_KEY);
	ioctl(uinput_fd, UI_SET_EVBIT, EV_MSC);
	
	for(i = 0; i < 256; i++){
		ioctl(uinput_fd, UI_SET_KEYBIT, i);
	}
	ioctl(uinput_fd, UI_SET_MSCBIT, KEY_CUSTOM_UP);
	ioctl(uinput_fd, UI_SET_MSCBIT, KEY_CUSTOM_DOWN);
	
	ret = write(uinput_fd, &uinput_dev, sizeof(struct uinput_user_dev));
	if(ret < 0){
		printf("%s:%d\n", __func__, __LINE__);
		return ret;//error process.
	}
	
	ret = ioctl(uinput_fd, UI_DEV_CREATE);
	if(ret < 0){
		printf("%s:%d\n", __func__, __LINE__);
		close(uinput_fd);
		return ret;//error process.
	}
}

int report_key(unsigned int type, unsigned int keycode, unsigned int value)
{
	struct input_event key_event;
	int ret;
	
	memset(&key_event, 0, sizeof(struct input_event));
	
	gettimeofday(&key_event.time, NULL);
	key_event.type = type;
	key_event.code = keycode;
	key_event.value = value;
	ret = write(uinput_fd, &key_event, sizeof(struct input_event));
	if(ret < 0){
		printf("%s:%d\n", __func__, __LINE__);
		return ret;//error process.
	}
	
	gettimeofday(&key_event.time, NULL);
	key_event.type = EV_SYN;
	key_event.code = SYN_REPORT;
	key_event.value = 0;//event status sync
	ret = write(uinput_fd, &key_event, sizeof(struct input_event));
	if(ret < 0){
		printf("%s:%d\n", __func__, __LINE__);
		return ret;//error process.
	}
	
	return 0;
}