标签:network ndt 自己的 point 内核 介绍 oba tcp res
A network socket is an endpoint of a connection across a computer network. Today, most communication between computers is based on the Internet Protocol; therefore most network sockets are Internet sockets. More precisely, a socket is a handle (abstract reference) that a local program can pass to the networking application programming interface (API) to use the connection, for example "send this data on this socket".
socket.
socket
(family=AF_INET, type=SOCK_STREAM, proto=0, fileno=None) 必会Create a new socket using the given address family, socket type and protocol number. The address family should be AF_INET
(the default), AF_INET6
, AF_UNIX
, AF_CAN
or AF_RDS
. The socket type should beSOCK_STREAM
(the default), SOCK_DGRAM
, SOCK_RAW
or perhaps one of the other SOCK_
constants. The protocol number is usually zero and may be omitted or in the case where the address family is AF_CAN
the protocol should be one of CAN_RAW
or CAN_BCM
. If fileno is specified, the other arguments are ignored, causing the socket with the specified file descriptor to return. Unlike socket.fromfd()
, fileno will return the same socket and not a duplicate. This may help close a detached socket using socket.close()
.
socket.
socketpair
([family[, type[, proto]]])
Build a pair of connected socket objects using the given address family, socket type, and protocol number. Address family, socket type, and protocol number are as for the socket()
function above. The default family is AF_UNIX
if defined on the platform; otherwise, the default is AF_INET
.
socket.
create_connection
(address[, timeout[, source_address]])
Connect to a TCP service listening on the Internet address (a 2-tuple (host, port)
), and return the socket object. This is a higher-level function than socket.connect()
: if host is a non-numeric hostname, it will try to resolve it for both AF_INET
and AF_INET6
, and then try to connect to all possible addresses in turn until a connection succeeds. This makes it easy to write clients that are compatible to both IPv4 and IPv6.
Passing the optional timeout parameter will set the timeout on the socket instance before attempting to connect. If no timeout is supplied, the global default timeout setting returned by getdefaulttimeout()
is used.
If supplied, source_address must be a 2-tuple (host, port)
for the socket to bind to as its source address before connecting. If host or port are ‘’ or 0 respectively the OS default behavior will be used.
socket.
getaddrinfo
(host, port, family=0, type=0, proto=0, flags=0) #获取要连接的对端主机地址 必会
sk.bind(address) 必会
s.bind(address) 将套接字绑定到地址。address地址的格式取决于地址族。在AF_INET下,以元组(host,port)的形式表示地址。
sk.listen(backlog) 必会
开始监听传入连接。backlog指定在拒绝连接之前,可以挂起的最大连接数量。
backlog等于5,表示内核已经接到了连接请求,但服务器还没有调用accept进行处理的连接个数最大为5
这个值不能无限大,因为要在内核中维护连接队列
sk.setblocking(bool) 必会
是否阻塞(默认True),如果设置False,那么accept和recv时一旦无数据,则报错。
sk.accept() 必会
接受连接并返回(conn,address),其中conn是新的套接字对象,可以用来接收和发送数据。address是连接客户端的地址。
接收TCP 客户的连接(阻塞式)等待连接的到来
sk.connect(address) 必会
连接到address处的套接字。一般,address的格式为元组(hostname,port),如果连接出错,返回socket.error错误。
sk.connect_ex(address)
同上,只不过会有返回值,连接成功时返回 0 ,连接失败时候返回编码,例如:10061
sk.close() 必会
关闭套接字
sk.recv(bufsize[,flag]) 必会
接受套接字的数据。数据以字符串形式返回,bufsize指定最多可以接收的数量。flag提供有关消息的其他信息,通常可以忽略。
sk.recvfrom(bufsize[.flag])
与recv()类似,但返回值是(data,address)。其中data是包含接收数据的字符串,address是发送数据的套接字地址。
sk.send(string[,flag]) 必会
将string中的数据发送到连接的套接字。返回值是要发送的字节数量,该数量可能小于string的字节大小。即:可能未将指定内容全部发送。
sk.sendall(string[,flag]) 必会
将string中的数据发送到连接的套接字,但在返回之前会尝试发送所有数据。成功返回None,失败则抛出异常。
内部通过递归调用send,将所有内容发送出去。
sk.sendto(string[,flag],address)
将数据发送到套接字,address是形式为(ipaddr,port)的元组,指定远程地址。返回值是发送的字节数。该函数主要用于UDP协议。
sk.settimeout(timeout) 必会
设置套接字操作的超时期,timeout是一个浮点数,单位是秒。值为None表示没有超时期。一般,超时期应该在刚创建套接字时设置,因为它们可能用于连接的操作(如 client 连接最多等待5s )
sk.getpeername() 必会
返回连接套接字的远程地址。返回值通常是元组(ipaddr,port)。
sk.getsockname()
返回套接字自己的地址。通常是一个元组(ipaddr,port)
sk.fileno()
套接字的文件描述符
socket.
sendfile
(file, offset=0, count=None)
发送文件 ,但目前多数情况下并无什么卵用。
import socket,subprocess server=socket.socket() server.bind((‘0.0.0.0‘,8000)) server.listen(5) print("---waiting for client---") while True: conn,addr=server.accept() #conn就是客户端连过来而在服务端为其生成的一个连接实例 print(conn,addr) while True: try: data=conn.recv(1024) print("recv:",data.decode()) res_obj=subprocess.Popen(data,shell=True,stdout=subprocess.PIPE,stderr=subprocess.PIPE) res=res_obj.stdout.read() conn.send(str(len(res)).encode()) conn.send(res) except Exception as e: print(e) break
import socket client = socket.socket() client.connect(("localhost",8000)) while True: msg=input(">>:").strip() if len(msg)==0:continue client.send(msg.encode()) data=client.recv(1024) total_size=int(data.decode()) resive_size=0 res=b‘‘ while resive_size<total_size: d=client.recv(1024) res+=d resive_size+=len(d) print(res.decode())
标签:network ndt 自己的 point 内核 介绍 oba tcp res
原文地址:http://www.cnblogs.com/xone/p/6126556.html