根據下列網站，練習了一下 the user level input subsystem
http://thiemonge.org/getting-started-with-uinput
以下為source code，其效果為 ubtune 桌面上的 Terminal會秀出 "ddddd"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <linux/input.h>
#include <linux/uinput.h>
int main(void)
{
int fd;
int ret;
struct uinput_user_dev uidev;
struct input_event ev;
int i;
// open /dev/uinput device
fd=open("/dev/uinput",O_WRONLY | O_NONBLOCK);
if(fd<0){
printf("open uinput fail \r\n");
exit(EXIT_FAILURE);
}
printf("open uinput successfully \r\n");
//
ret=ioctl(fd,UI_SET_EVBIT,EV_SYN);
if(ret<0){
printf("ioctl EV_SYN fail \r\n");
exit(EXIT_FAILURE);
}
//
ret=ioctl(fd,UI_SET_EVBIT,EV_KEY);
if(ret<0){
printf("ioctl EV_KEY fail \r\n");
exit(EXIT_FAILURE);
}
ret=ioctl(fd,UI_SET_KEYBIT,KEY_D);
if(ret<0){
printf("ioctl KEY_D fail \r\n");
exit(EXIT_FAILURE);
}else{
printf("ioctl KEY_D ok \r\n");
}
memset(&uidev, 0, sizeof(uidev));
snprintf(uidev.name, UINPUT_MAX_NAME_SIZE, "yps-sample");
uidev.id.bustype = BUS_USB;
uidev.id.vendor = 0x1234;
uidev.id.product = 0xfedc;
uidev.id.version = 1;
ret = write(fd, &uidev, sizeof(uidev));
if(ret<0){
printf("write uidev fail \r\n");
exit(EXIT_FAILURE);
}else{
printf("write uidev ok \r\n");
}
ret = ioctl(fd, UI_DEV_CREATE);
if(ret<0){
printf("UI_DEV_CREATE fail \r\n");
exit(EXIT_FAILURE);
}else{
printf("UI_DEV_CREATE ok \r\n");
}
sleep(2); // must wait UI_DEV_CREATE ready
for(i = 0; i <5; i++) { // sleep 1 s than loop
printf("i=%d \r\n",i);
// key press
memset(&ev, 0, sizeof(ev));
ev.type = EV_KEY;
ev.code = KEY_D;
ev.value = 1;
ret = write(fd, &ev, sizeof(ev));
if(ret<0){
printf("KEY_D press fail \r\n");
exit(EXIT_FAILURE);
}else{
printf("KEY_D press ok \r\n");
}
memset(&ev, 0, sizeof(ev));
ev.type = EV_SYN;
ev.code = SYN_REPORT;
ev.value = 0;
ret = write(fd, &ev, sizeof(ev));
if(ret<0){
printf("KEY_D sync \r\n");
exit(EXIT_FAILURE);
}else{
printf("KEY_D sync ok \r\n");
}
usleep(15000);
// key release
memset(&ev, 0, sizeof(ev));
ev.type = EV_KEY;
ev.code = KEY_D;
ev.value = 0;
ret = write(fd, &ev, sizeof(ev));
if(ret<0){
printf("KEY_D release fail \r\n");
exit(EXIT_FAILURE);
}else{
printf("KEY_D release ok \r\n");
}
memset(&ev, 0, sizeof(ev));
ev.type = EV_SYN;
ev.code = SYN_REPORT;
ev.value = 0;
ret = write(fd, &ev, sizeof(ev));
if(ret<0){
printf("EV_SYN SYN_REPORT fail \r\n");
exit(EXIT_FAILURE);
}else{
printf("EV_SYN SYN_REPORT ok \r\n");
}
usleep(15000);
}
printf("loop end \r\n");
sleep(1);
ret = ioctl(fd, UI_DEV_DESTROY);
if(ret<0){
printf("UI_DEV_DESTROY fail \r\n");
exit(EXIT_FAILURE);
}else{
printf("UI_DEV_DESTROY ok \r\n");
}
close(fd);
return;
}
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