Linux下使用uinput创建虚拟设备（Ubuntu20.04.2）

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已于 2022-08-02 15:09:02 修改

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文章标签： linux c++

于 2021-11-16 23:02:45 首次发布

本文链接：https://blog.youkuaiyun.com/m0_52391919/article/details/121347212

使用uinput创建虚拟设备节点，生成虚拟设备。

开始之前首先要了解查看Linux下USB设备的命令：

root@ubuntu:~# cat /proc/bus/input/devices
I: Bus=0019 Vendor=0000 Product=0001 Version=0000
N: Name="Power Button"
P: Phys=LNXPWRBN/button/input0
S: Sysfs=/devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
U: Uniq=
H: Handlers=kbd event0 
B: PROP=0
B: EV=3
B: KEY=10000000000000 0

I: Bus=0011 Vendor=0001 Product=0001 Version=ab41
N: Name="AT Translated Set 2 keyboard"
P: Phys=isa0060/serio0/input0
S: Sysfs=/devices/platform/i8042/serio0/input/input1
U: Uniq=
H: Handlers=sysrq kbd event1 leds 
B: PROP=0
B: EV=120013
B: KEY=402000000 3803078f800d001 feffffdfffefffff fffffffffffffffe
B: MSC=10
B: LED=7

I: Bus=0011 Vendor=0002 Product=0013 Version=0006
N: Name="VirtualPS/2 VMware VMMouse"
P: Phys=isa0060/serio1/input1
S: Sysfs=/devices/platform/i8042/serio1/input/input4
U: Uniq=
H: Handlers=mouse0 event2 
B: PROP=0
B: EV=b
B: KEY=70000 0 0 0 0
B: ABS=3

I: Bus=0011 Vendor=0002 Product=0013 Version=0006
N: Name="VirtualPS/2 VMware VMMouse"
P: Phys=isa0060/serio1/input0
S: Sysfs=/devices/platform/i8042/serio1/input/input3
U: Uniq=
H: Handlers=mouse1 event3 
B: PROP=1
B: EV=7
B: KEY=30000 0 0 0 0
B: REL=103

I: Bus=0003 Vendor=0e0f Product=0003 Version=0110
N: Name="VMware VMware Virtual USB Mouse"
P: Phys=usb-0000:02:00.0-1/input0
S: Sysfs=/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb2/2-1/2-1:1.0/0003:0E0F:0003.0001/input/input5
U: Uniq=
H: Handlers=mouse2 event4 
B: PROP=0
B: EV=17
B: KEY=ff0000 0 0 0 0
B: REL=903
B: MSC=10

I: Bus=0003 Vendor=093a Product=2510 Version=0001
N: Name="Virtual Mouse"
P: Phys=mouse41547/41547
S: Sysfs=/devices/virtual/input/input47
U: Uniq=
H: Handlers=mouse3 event5 
B: PROP=0
B: EV=17
B: KEY=ff0000 0 0 0 0
B: REL=903
B: MSC=10

在我的虚拟机下运行结果是这样的；event0-event4这5个设备节点是这样的（虽然我也不太清楚为什么会默认生成这5个节点），event5是我的程序生成的一个虚拟鼠标的节点。

使用libinput record命令输入对应的节点可以查看到当前设备存在哪些键值：

root@ubuntu:~# libinput record
Available devices:
/dev/input/event0:	Power Button
/dev/input/event1:	AT Translated Set 2 keyboard
/dev/input/event2:	VirtualPS/2 VMware VMMouse
/dev/input/event3:	VirtualPS/2 VMware VMMouse
/dev/input/event4:	VMware VMware Virtual USB Mouse
/dev/input/event5:	Virtual Mouse
Select the device event number: 5
Recording to 'stdout'.
version: 1
ndevices: 1
libinput:
  version: "1.15.5"
  git: "unknown"
system:
  os: "ubuntu:20.04"
  kernel: "5.11.0-40-generic"
  dmi: "dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd11/12/2020:br4.6:efr0.0:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:sku:rvnIntelCorporation:rn440BX