如何获取uinput创建的设备的名称(路径) [英] How to get name (path) of uinput created device

问题描述

我已经成功设置了一个小程序来创建uinput 我打算用来自动测试接收键盘输入事件的应用程序的设备.

I have successfully set up a small program to create a uinput device which I plan to use to automate testing of an application receiving keyboard input events.

我已经同时跟踪两者 answer .

I have followed both tutorials as found in this very nice answer.

当我的程序通过调用ioctl(fd, UI_DEV_CREATE)创建uinput设备时，文件系统中会出现一个新设备，因此我的被测试应用程序可以连接到该设备并等待事件.我的目标系统已经有一个/dev/input/event0设备，因此新的系统将获得路径/dev/input/event1.如果我为台式机系统(存在现有设备/dev/input/event[0-15])编译并运行该程序，则在运行该程序时，新设备将获得/dev/input/event16.

When my program creates the uinput device by calling ioctl(fd, UI_DEV_CREATE) a new device appears in the file system so my application under test can attach to it and wait for events. My target system already has a /dev/input/event0 device so the new one gets the path /dev/input/event1. If I compile and run the program for my desktop system, where there are existing devices /dev/input/event[0-15], when the program is run the new device gets /dev/input/event16.

我希望我的程序在创建新设备后报告它.有办法吗?

I'd like my program to report the new device name after creating it. Is there a way to get it?

推荐答案

是的，如果平台上可用UI_GET_SYSNAME(在/usr/include/linux/uinput.h中定义)，则可以使用UI_GET_SYSNAME(例如，Android在某些情况下未对其进行定义)原因).它会为您提供在/sys/devices/virtual/input中创建的设备的名称.知道 sysfs 中的设备后，您可以通过阅读

Yes, you can use UI_GET_SYSNAME (defined in /usr/include/linux/uinput.h) if it's available on your platform (Android, for instance, does not define it for some reason). It will give you a name for the device created in /sys/devices/virtual/input. Once you know the device in sysfs, you can figure out the device(s) created in /dev/input by reading this SO question.

像这样调用UI_DEV_CREATE后使用它(忽略错误/健全性检查):

Use it after calling UI_DEV_CREATE like so (omitting error/sanity checking):

ioctl(fd, UI_DEV_CREATE);

char sysfs_device_name[16];
ioctl(fd, UI_GET_SYSNAME(sizeof(sysfs_device_name)), sysfs_device_name);
printf("/sys/devices/virtual/input/%s\n", sysfs_device_name);

如果不可用，则可以尝试在/proc/bus/input/devices中查找sysfs设备，该设备应包含以下条目:

If it is not available, you can try looking up the sysfs device in /proc/bus/input/devices which should contain an entry like:

I: Bus=0006 Vendor=0001 Product=0001 Version=0001
N: Name="your-uinput-device-name"
P: Phys=
S: Sysfs=/devices/virtual/input/input12
U: Uniq=
H: Handlers=sysrq kbd mouse0 event11 
B: PROP=0
B: EV=7
B: KEY=70000 0 0 0 0 0 7ffff ffffffff fffffffe
B: REL=143

..有点混乱.但是正如您所看到的，它还会为您提供在/dev/input中创建的设备的快捷方式.

..which is a bit messier. But as you can see it'll also give you a shortcut to the device created in /dev/input.

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