Linux kernel, Android, Golang & Recsys

今天通过libusb访问一个HID的设备，一调用USBDEVFS_{CLAIMINTERFACE} ioctl就返回-1设备忙, 找了一下午原因也没有找到， 快到下班的时候， 发现了一篇文章Porting Libusb for Android on the Beagleboard in 5 steps 提到 需要把设备加载到usbfs上，结果加载了usbfs设备就能正常访问了。

在网上搜了一圈，发现libusb就是通过usbfs或usbdevfs来链接USB设备，所以在使用之前 必须加载usbfs到/dev/bus/usb或/proc/bus/usb目录. 原文如下:

libusb uses a pseudo-filesystem known as ‘usbdevfs` or ‘usbfs` to access
the USB devices connected to your machine. This filesystem must be mounted
under /proc/bus/usb for libusb to work.

libusb移植到Android具体可以参考Porting Libusb for Android on the Beagleboard in 5 steps

需要注意的是:

• 在命令行加载sysfs需要执行:
  • mount -t usbfs -o devmode=666 none /proc/bus/usb
• 在init.rc中需要使用:
  • mount usbfs none /proc/bus/usb -o devmode=0666

参考

• libusb
• libusb-android
• Porting Libusb for Android on the Beagleboard in 5 steps
• can’t mount usbfs in Android 2.2
• libusb和HID设备

windows: hosts文件在C:\WINDOWS\system32\drivers\etc目录下 hosts文件
Linux: sudo vi /etc/hosts

下面包含Google+和Youtube

203.208.46.29 plus.Google.com
203.208.46.29 talkgadget.google.com

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203.208.46.29 v24.lscache5.c.youtube.com
203.208.46.29 v1.lscache6.c.youtube.com
203.208.46.29 v2.lscache6.c.youtube.com
203.208.46.29 v3.lscache6.c.youtube.com
203.208.46.29 v4.lscache6.c.youtube.com
203.208.46.29 v5.lscache6.c.youtube.com
203.208.46.29 v6.lscache6.c.youtube.com
203.208.46.29 v7.lscache6.c.youtube.com
203.208.46.29 v8.lscache6.c.youtube.com
203.208.46.29 v9.lscache6.c.youtube.com
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203.208.46.29 v11.lscache6.c.youtube.com
203.208.46.29 v12.lscache6.c.youtube.com
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203.208.46.29 v16.lscache6.c.youtube.com
203.208.46.29 v17.lscache6.c.youtube.com
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203.208.46.29 v19.lscache6.c.youtube.com
203.208.46.29 v20.lscache6.c.youtube.com
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203.208.46.29 v24.lscache6.c.youtube.com
203.208.46.29 v1.lscache7.c.youtube.com
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203.208.46.29 v5.lscache7.c.youtube.com
203.208.46.29 v6.lscache7.c.youtube.com
203.208.46.29 v7.lscache7.c.youtube.com
203.208.46.29 v8.lscache7.c.youtube.com
203.208.46.29 v9.lscache7.c.youtube.com
203.208.46.29 v10.lscache7.c.youtube.com
203.208.46.29 v11.lscache7.c.youtube.com
203.208.46.29 v12.lscache7.c.youtube.com
203.208.46.29 v13.lscache7.c.youtube.com
203.208.46.29 v14.lscache7.c.youtube.com
203.208.46.29 v15.lscache7.c.youtube.com
203.208.46.29 v16.lscache7.c.youtube.com
203.208.46.29 v17.lscache7.c.youtube.com
203.208.46.29 v18.lscache7.c.youtube.com
203.208.46.29 v19.lscache7.c.youtube.com
203.208.46.29 v20.lscache7.c.youtube.com
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203.208.46.29 v22.lscache7.c.youtube.com
203.208.46.29 v23.lscache7.c.youtube.com
203.208.46.29 v24.lscache7.c.youtube.com
203.208.46.29 v1.lscache8.c.youtube.com
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203.208.46.29 v3.lscache8.c.youtube.com
203.208.46.29 v4.lscache8.c.youtube.com
203.208.46.29 v5.lscache8.c.youtube.com
203.208.46.29 v6.lscache8.c.youtube.com
203.208.46.29 v7.lscache8.c.youtube.com
203.208.46.29 v8.lscache8.c.youtube.com
203.208.46.29 v9.lscache8.c.youtube.com
203.208.46.29 v10.lscache8.c.youtube.com
203.208.46.29 v11.lscache8.c.youtube.com
203.208.46.29 v12.lscache8.c.youtube.com
203.208.46.29 v13.lscache8.c.youtube.com
203.208.46.29 v14.lscache8.c.youtube.com
203.208.46.29 v15.lscache8.c.youtube.com
203.208.46.29 v16.lscache8.c.youtube.com
203.208.46.29 v17.lscache8.c.youtube.com
203.208.46.29 v18.lscache8.c.youtube.com
203.208.46.29 v19.lscache8.c.youtube.com
203.208.46.29 v20.lscache8.c.youtube.com
203.208.46.29 v21.lscache8.c.youtube.com
203.208.46.29 v22.lscache8.c.youtube.com
203.208.46.29 v23.lscache8.c.youtube.com
203.208.46.29 v24.lscache8.c.youtube.com

参考:
1. 修改hosts看youtube