使用/dev/uinput的简要介绍(含demo程序)【转】
本文转载自:https://blog.csdn.net/zhongkunjia/article/details/75142699
uinput机制有2个很大的优点:
1) 不用自己写驱动(比如弄个红外遥控器、车载线控)。
2) 创建/dev/input/eventX节点,在用户态下向/dev/input/eventX写入事件,即可模拟键盘、鼠标等的事件输入。
操作流程:
1)打开UInput Device
2)设置UInput Device
3)写入设备信息
4)创建Input Device
5*)向Input Device发送Event
具体的demo代码如下:
//uinput-demo.c
- #include <stdio.h>
- #include <stdlib.h>
- #include <unistd.h>
- #include <fcntl.h>
- #include <string.h>
- #include <linux/uinput.h>
- #include <linux/input.h>
- #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);
- int main(int argc, char *argv[])
- {
- int ret = 0;
- 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_A, 1);// Report BUTTON A CLICK - PRESS event
- report_key(EV_KEY, KEY_A, 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;
- }
编译方法:
root@ubuntu:/home/ubuntu/Documents# gcc uinput-demo.c -o uinput-demo
root@ubuntu:/home/ubuntu/Documents# ls
uinput-demo uinput-demo.c
root@ubuntu:/home/ubuntu/Documents# ./uinput-demo ------执行时要用root用户登入才行
这时,在开个终端,切换到:root@ubuntu:/dev/input#
执行hexdump -C event5 ------event5是创建uinput时生成的节点
10秒到后,显示结果:
root@ubuntu:/dev/input# hexdump -C event5
00000000 bd 5e 69 59 aa fd 05 00 01 00 1e 00 01 00 00 00 |.^iY............|
00000010 bd 5e 69 59 aa fd 05 00 00 00 00 00 00 00 00 00 |.^iY............|
00000020 bd 5e 69 59 d7 fd 05 00 01 00 1e 00 00 00 00 00 |.^iY............|
00000030 bd 5e 69 59 d7 fd 05 00 00 00 00 00 00 00 00 00 |.^iY............|
00000040 bd 5e 69 59 db fd 05 00 01 00 20 00 0c 00 00 00 |.^iY...... .....|
00000050 bd 5e 69 59 db fd 05 00 00 00 00 00 00 00 00 00 |.^iY............|
00000060 bd 5e 69 59 dd fd 05 00 01 00 20 00 00 00 00 00 |.^iY...... .....|
00000070 bd 5e 69 59 dd fd 05 00 00 00 00 00 00 00 00 00 |.^iY............|
adhexdump: event5: 没有那个设备
00000080
root@ubuntu:/dev/input#
也可以打开记事本,再次执行:
root@ubuntu:/home/ubuntu/Documents# ./uinput-demo
10秒到后,就会在记事本里输入:ad。
这样,就可以通过应用程序的执行模拟鼠标、键盘等的输入事件。