Understanding system processes through Python scripts

From socket Import *

From time import CTime

Import Os,sys #sys定义了进程退出的方法

host= ' localhost ' #定义主机

port=21567# defines the port number

bufsiz=1024# defines a buffer

Addr= (Host,port) #定义元组

Tcpsersock=socket (af_inet,sock_stream) #生成TCP socket

Tcpsersock.bind (ADDR) #将该Socket与元组进行绑定

Tcpsersock.listen (5) #监听请求

While True: #定义无限循环 (more and more like Shell)

Print "Waiting ..."

try:# has destroyed Tcpsersock in the build process, if not caught this exception will cause the program error!

Tcpclisock,addr=tcpsersock.accept ()

Except: #捕获所有异常

Sys.exit (0) #只要捕获到阻塞失败将退出当前进程. (only generated processes can cause blocking failures, and tcpsersock words are destroyed in the build process)

If Os.fork (): #如果在主进程中的操作

Pass

else: #如果在派生进程中的操作

print ' con from: ', addr

While True:

DATA=TCPCLISOCK.RECV (Bufsiz)

If not data:

Tcpsersock.close () #销毁tcpSerSock

break# jump out of the loop!

Tcpclisock.send (' [%s]%s '% (CTime (), data)

Tcpsersock.close () #这句永远不会被执行!

This article is from the "Lincoln" blog, please be sure to keep this source http://president.blog.51cto.com/4990508/1078402