UNIX下的通信

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今天继续往后读了一点，进度非常慢，可能是理解不深刻。先记录下今天学到的一些东西

UNIX套接字

查阅了一下，unix套接字用于计算机内部的交流。其地址是文件路径
且需要在unix/linux下
我是在unbunta下实现的。代码依旧来自《python标准库》

import socketimport sysimport osserver_adress = './uds_socket'try:    os.unlink(server_adress)except OSError:    if os.path.exists(server_adress):        raisesock = socket.socket(socket.AF_UNIX,socket.SOCK_STREAM)print >>sys.stderr,'starting up on %s' %server_adress    sock.bind(server_adress)sock.listen(1)while True:    print >>sys.stderr,'waiting for a connection'    connection ,client_address = sock.accept()    try:        print >>sys.stderr,'connection from',client_address        while True:            data = connection.recv(16)            print >>sys.stderr,'recived "%s"' %data            if data:                print >>sys.stderr,'sending data back to the client '                connection.sendall(data)            else:                print >>sys.stderr,'no data from %s'%client_address                break    finally:        connection.close()

下面是client端的
import socket
import sys

sock = socket.socket(socket.AF_UNIX,socket.SOCK_STREAM)server_address = './uds_socket'print >>sys.stderr,'connecting to %s'%server_addresstry:    sock.connect(server_address)except socket.error,msg:    print >>sys.stderr,msg    sys.exit(1)try:    message = 'This is the message.It will be repeated.'    print >>sys.stderr,'sending "%s"' %message    sock.sendall(message)    amount_received = 0    amount_expected = len(message)    while amount_received < amount_expected:        data = sock.recv(16)        amount_received+=len(data)        print >>sys.stderr,'received "%s"'%datafinally:    sock.close()

与之前的程序差异不大，很明显发现遵循以下几步
服务器：
1.先选择所需服务的套接字，例如
sock = socket(socket.AF_INET,socket.SOCK_STREAM)
这个是tcp
2绑定
3监听
4创建连接
5关闭
客户端：
1如上第一步
2连接
以上是最近总结的一些东西

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