win7开WIFI热点, xrdp远程, zsh 主题乱码, watchdog启用, 在线Linux内核, WebRTC

netsh wlan set hostednetwork mode=allow ssid=mywifi key=12345678html

开启成功后，网络链接中会多出一个网卡为“Microsoft Virtual WiFi Miniport Adapter”的无线链接2linux

单击已链接到Internet的网络链接，选择“属性”→“共享”，勾上“容许其余······链接(N)”并选择“无线链接2”。ios

若是此步报错，看服务里面的ICS服务及依赖服务，还有windows firewall防火墙必定要开启。git

netsh wlan start hostednetwork 至此，虚拟WiFi的红叉叉消失，WiFi基站已组建好。github

显示无线网络信息命令： netsh wlan show hostednetworkweb

https://daniel.haxx.se/docs/sshproxy.htmlwindows

sudo apt-get install xrdp
sudo apt-get install vnc4server tightvncserver
echo "xfce4-session" >~/.xsession
sudo gedit /etc/xrdp/startwm.sh 在. /etc/X11/Xsession 前一行插入网络

xfce4-sessionsession

sudo service xrdp restartssh

搞定，成功使用远程桌面链接图形界面, 保持上一次远程打开的图形桌面需增长以下
[xrdp8]
name=Reconnect
lib=libvnc.so
username=ask
password=ask
ip=127.0.0.1
port=5910

解决:ftp命令行不支持目录下载
经过wget获得解决
#wget ftp://IP:PORT/XXX/* --ftp-user=xxx --ftp-password=xxx -r

zsh的agnoster主题乱码

wget https://raw.githubusercontent.com/powerline/powerline/develop/font/10-powerline-symbols.conf

wget https://raw.githubusercontent.com/powerline/powerline/develop/font/PowerlineSymbols.otf
sudo cp 10-powerline-symbols.conf /usr/share/fonts/OTF/
sudo mv 10-powerline-symbols.conf /etc/fonts/conf.d/
sudo mv PowerlineSymbols.otf /usr/share/fonts/OTF/

# modinfo softdog
filename: /lib/modules/3.2.0-4-686-pae/kernel/drivers/watchdog/softdog.ko

2. 加载模块

# insmod /lib/modules/3.2.0-4-686-pae/kernel/drivers/watchdog/softdog.ko

3. 此刻可见/dev/watchdog, 或建立

# mknod /dev/watchdog c 10 130

4. 查看dev并赋予权限

# ls -l /dev/watchdog
crw------- 1 root root 10, 130 Mar 21 16:27 /dev/watchdog

# chmod o+rw /dev/watchdog

5. 测试使用watch dog

简单可写为：

# echo 0 > /dev/watchdog ///今后刻起计时，启用watchdog

# echo -n V > /dev/watchdog ///停用watchdog

6. 硬件与软件watchdog的区别
硬件watchdog必须有硬件电路支持, 设备节点/dev/watchdog对应着真实的物理设备，不一样类型的硬件watchdog设备由相应的硬件驱动管理。软件watchdog由一内核模块softdog.ko 经过定时器机制实现，/dev/watchdog并不对应着真实的物理设备，只是为应用提供了一个与操做硬件watchdog相同的接口。

硬件watchdog比软件watchdog有更好的可靠性。软件watchdog基于内核的定时器实现，当内核或中断出现异常时，软件watchdog将会失效。而硬件watchdog由自身的硬件电路控制, 独立于内核。不管当前系统状态如何，硬件watchdog在设定的时间间隔内没有被执行写操做，仍会从新启动系统

看门狗是混杂设备，因此主设备号是10，/include/linux/miscdevice.h 中定义他的次设备号为130

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3 #include <unistd.h>
 4 
 5 #include <sys/types.h>
 6 #include <sys/stat.h>
 7 #include <fcntl.h>
 8 #include <termios.h>
 9 #include <errno.h>
10 #include <signal.h>
11 #include <time.h>
12 #include <pthread.h>
13 #include <sys/time.h>
14 #include <linux/watchdog.h>
15 #include <sys/ioctl.h>
16  
17 time_t  backTime;
18 struct tm *pBackTime;
19 int wt_fd;
20  
21 static void sigAlarm(int sig)
22 {
23     char flag = '0';
24     (void)time(&backTime);
25     pBackTime= localtime(&backTime);
26     printf("day: %d; hour: %d; min: %d; sec: %d\n", pBackTime->tm_mday, pBackTime->tm_hour, pBackTime->tm_min, pBackTime->tm_sec);
27  
28     write(wt_fd, &flag, 1); //Reset Watchdog  喂狗
29     alarm(2);
30     return;
31 }
32  
33 
34 int main()
35 {
36        char flag = 'V';
37        int ret;
38        int timeout = 42;
39        
40        if(SIG_ERR == signal(SIGALRM, sigAlarm))
41        {
42            perror("signal (SIGALARM) error");
43        }
44  
45        wt_fd = open("/dev/watchdog", O_RDWR);
46        if(wt_fd <= 0)
47        {
48            printf("Fail to open watchdog  device!\n");
49        }
50        else
51        {
52            write(wt_fd,NULL,0);
53            printf("Turn on Watch Dog\n");
54            ret = ioctl(wt_fd, WDIOC_SETTIMEOUT, &timeout);
55            if(EINVAL == ret)
56            {
57                 printf("EINVAL Returned\n");
58            }
59            else if(EFAULT == ret)
60            {
61                 printf("EFAULT Returned\n");
62            }
63            else if(0 == ret)
64            {
65                 printf("Set timeout %d secs success\n", timeout);
66            }
67            else
68            {
69                 printf("Ret %d\n", ret);
70            }
71        }
72  
73        alarm(3);
74  
75        while(1);
76  
77        write(wt_fd, &flag, 1);
78        printf("Turned off Watch Dog\n");
79        close(wt_fd);
80        return 0;
81 }

View Code

在线Linux 内核代码

http://lxr.linux.no/ 　　　　　　　　 1st
http://fxr.watson.org/
http://sourceforge.net/projects/lxr/

http://blog.sina.com.cn/s/blog_69a04cf401016gz4.html