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之前一直奇怪应用程序是如何得到键盘输入的，首先这肯定与键盘的驱动程序有关，但驱动程序是如何把键盘输入传递给用户进程的？这个问题在用了windows下一个按键精灵后达到了顶峰，该案件精灵使用一个脚本表达模拟发送的键盘按键和鼠标移动，之后可以自动进行操作，这说明上层应用有操作鼠标键盘的能力．查找资料后，发现原来对于linux，鼠标和键盘驱动是这样写的: 鼠标\键盘的输入会转为/dev/input下的io事件event*，设备对应的event号可通过cat /proc/bus/input/devices查看．比如我查看该文件的内容：
I: Bus=0019 Vendor=0000 Product=0003 Version=0000
N: Name="Sleep Button"
P: Phys=PNP0C0E/button/input0
S: Sysfs=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0E:00/input/input0
U: Uniq=
H: Handlers=kbd event0
B: PROP=0
B: EV=3
B: KEY=4000 0 0
I: Bus=0019 Vendor=0000 Product=0001 Version=0000
N: Name="Power Button"
P: Phys=PNP0C0C/button/input0
S: Sysfs=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input1
U: Uniq=
H: Handlers=kbd event1
B: PROP=0
B: EV=3
B: KEY=10000000000000 0
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/input2
U: Uniq=
H: Handlers=kbd event2
B: PROP=0
B: EV=3
B: KEY=10000000000000 0
I: Bus=0019 Vendor=0000 Product=0006 Version=0000
N: Name="Video Bus"
P: Phys=LNXVIDEO/video/input0
S: Sysfs=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input3
U: Uniq=
H: Handlers=kbd event3
B: PROP=0
B: EV=3
B: KEY=3e000b00000000 0 0 0
I: Bus=0003 Vendor=413c Product=2113 Version=0111
N: Name="Dell KB216 Wired Keyboard"
P: Phys=usb-0000:00:14.0-1/input0
S: Sysfs=/devices/pci0000:00/0000:00:14.0/usb1/1-1/1-1:1.0/0003:413C:2113.0001/input/input4
U: Uniq=
H: Handlers=sysrq kbd event4 leds
B: PROP=0
B: EV=120013
B: KEY=1000000000007 ff9f207ac14057ff febeffdfffefffff fffffffffffffffe
B: MSC=10
B: LED=1f
I: Bus=0003 Vendor=413c Product=2113 Version=0111
N: Name="Dell KB216 Wired Keyboard"
P: Phys=usb-0000:00:14.0-1/input1
S: Sysfs=/devices/pci0000:00/0000:00:14.0/usb1/1-1/1-1:1.1/0003:413C:2113.0002/input/input5
U: Uniq=
H: Handlers=kbd event5
B: PROP=0
B: EV=1f
B: KEY=300ff 0 0 483ffff17aff32d bf54444600000000 1 130c730b17c000 267bfad941dfed 9e168000004400 10000002
B: REL=40
B: ABS=100000000
B: MSC=10
I: Bus=0003 Vendor=03f0 Product=134a Version=0111
N: Name="PixArt HP USB Optical Mouse"
P: Phys=usb-0000:00:14.0-2/input0
S: Sysfs=/devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.0/0003:03F0:134A.0003/input/input6
U: Uniq=
H: Handlers=mouse0 event6
B: PROP=0
B: EV=17
B: KEY=ff0000 0 0 0 0
B: REL=103
B: MSC=10
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel PCH Front Mic"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:1f.3/sound/card0/input7
U: Uniq=
H: Handlers=event7
B: PROP=0
B: EV=21
B: SW=10
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel PCH Rear Mic"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:1f.3/sound/card0/input8
U: Uniq=
H: Handlers=event8
B: PROP=0
B: EV=21
B: SW=10
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel PCH Line"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:1f.3/sound/card0/input9
U: Uniq=
H: Handlers=event9
B: PROP=0
B: EV=21
B: SW=2000
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel PCH Line Out Front"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:1f.3/sound/card0/input10
U: Uniq=
H: Handlers=event10
B: PROP=0
B: EV=21
B: SW=40
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel PCH Line Out Surround"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:1f.3/sound/card0/input11
U: Uniq=
H: Handlers=event11
B: PROP=0
B: EV=21
B: SW=40
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel PCH Line Out CLFE"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:1f.3/sound/card0/input12
U: Uniq=
H: Handlers=event12
B: PROP=0
B: EV=21
B: SW=40
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel PCH Front Headphone"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:1f.3/sound/card0/input13
U: Uniq=
H: Handlers=event13
B: PROP=0
B: EV=21
B: SW=4
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel PCH HDMI/DP,pcm=3"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:1f.3/sound/card0/input14
U: Uniq=
H: Handlers=event14
B: PROP=0
B: EV=21
B: SW=140
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel PCH HDMI/DP,pcm=7"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:1f.3/sound/card0/input15
U: Uniq=
H: Handlers=event15
B: PROP=0
B: EV=21
B: SW=140
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel PCH HDMI/DP,pcm=8"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:1f.3/sound/card0/input16
U: Uniq=
H: Handlers=event16
B: PROP=0
B: EV=21
B: SW=140
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel PCH HDMI/DP,pcm=9"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:1f.3/sound/card0/input17
U: Uniq=
H: Handlers=event17
B: PROP=0
B: EV=21
B: SW=140
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel PCH HDMI/DP,pcm=10"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:1f.3/sound/card0/input18
U: Uniq=
H: Handlers=event18
B: PROP=0
B: EV=21
B: SW=140
I: Bus=0019 Vendor=0000 Product=0000 Version=0000
N: Name="Eee PC WMI hotkeys"
P: Phys=eeepc-wmi/input0
S: Sysfs=/devices/platform/eeepc-wmi/input/input19
U: Uniq=
H: Handlers=rfkill kbd event19
B: PROP=0
B: EV=100013
B: KEY=7e40000 0 800000000000 0 0 1400b00100000 300180001100800 e000000000000 2
B: MSC=10
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA NVidia HDMI/DP,pcm=3"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1/input20
U: Uniq=
H: Handlers=event20
B: PROP=0
B: EV=21
B: SW=140
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA NVidia HDMI/DP,pcm=7"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1/input21
U: Uniq=
H: Handlers=event21
B: PROP=0
B: EV=21
B: SW=140
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA NVidia HDMI/DP,pcm=8"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1/input22
U: Uniq=
H: Handlers=event22
B: PROP=0
B: EV=21
B: SW=140
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA NVidia HDMI/DP,pcm=9"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1/input23
U: Uniq=
H: Handlers=event23
B: PROP=0
B: EV=21
B: SW=140
鼠标对应event６比较明显，键盘可能是event4或event5,应用程序试了两次发现event5无效，event４有效，至于为什么有２个event对应键盘就不知道了． 应用程序如下：
//读取键盘输入
#include
#include
#include
#include
#include
int main()
{
int fd_kb;
struct input_event event_kb;
fd_kb = open("/dev/input/event4", O_RDONLY); //键盘输入
if (fd_kb |