Linux C中读取/dev/input/event设备来判断键盘按键是否按下

////

include <stdio.h>

include <linux/input.h>

include <stdlib.h>

include <sys/types.h>

include <sys/stat.h>

include <fcntl.h>

define DEV_PATH "/dev/input/event2" //difference is possible

int main()
{
int keys_fd;
char ret[2];
struct input_event t;
keys_fd=open(DEV_PATH, O_RDONLY);
if(keys_fd <= 0)
{
printf("open /dev/input/event2 device error! ");
return -1;
}
while(1)
{
if(read(keys_fd, &t, sizeof(t)) == sizeof(t))
{
if(t.typeEV_KEY)
if(t.value0 || t.value==1)
{
printf("key %d %s ", t.code, (t.value) ? "Pressed" : "Released");
if(t.code == KEY_ESC)
break;
}
}
}
close(keys_fd);
return 0;
}