Question

可能重复：
select() isn't responding to writing on /dev/input/mice

我正在编写一个程序，通过select()监视键盘和鼠标设备文件。它等待那些文件上的任何写操作（这应该在键击或鼠标移动时发生），并且一旦有写操作，就会执行一些作业。但它没有用。代码如下。有人能帮助我吗？

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




void main()
{
    int mouse_fd,kbd_fd,fd_max;
    struct input_event ev;
    fd_set rfs,wfs;

    if((mouse_fd=open("/dev/input/event3",O_WRONLY))==-1)
            {
                printf("opening mouse device file has failed \n");
            }
    else
            {
                printf("opening mouse device file has been successfull \n");
            }
    if((kbd_fd=open("/dev/input/event2",O_WRONLY))==-1)
            {
                printf("opening keyboard device file has failed \n");
            }
    else
        {
            printf("opening keyboard device file has been successfull \n");
        }


    if(mouse_fd>kbd_fd)
        {
            fd_max=mouse_fd;
        }
    else
        {
         fd_max=kbd_fd;
        }

    while(1)
    {
         FD_ZERO(&rfs);
             FD_ZERO(&wfs);
             FD_SET(mouse_fd,&rfs);
             FD_SET(kbd_fd,&rfs);
             FD_SET(mouse_fd,&wfs);
             FD_SET(kbd_fd,&wfs);
                 select((fd_max+1),&rfs,NULL,NULL,NULL);

        if(FD_ISSET(mouse_fd,&rfs))
            {
                printf("test mouse \n");
            }
        if(FD_ISSET(kbd_fd,&rfs))
            {
                printf("test keyboard \n");
                }

   }
}

当我执行程序时，它输出如下：

[root@localhost Project]# gcc select.c
[root@localhost Project]# ./a.out
opening mouse device file has been successfull 
opening keyboard device file has been successfull 
test keyboard 
test mouse 
test keyboard 
test mouse 
test keyboard 
test mouse 
test keyboard 
test mouse 
test keyboard 
test mouse

虽然我没有按任何键或移动鼠标。

Answer 1

你正在打开我认为错误的文件

/ dev / input / event3 - 键盘事件 / dev / input / event2 - 鼠标事件

检查 cat / dev / input / event3

select（）没有响应写入/ dev / input / mice

1 个答案: