if ( sock < 0 ) { perror("Error creating socket"); return(0); } imreq.imr_multiaddr.s_addr = inet_addr("239.239.31.31"); imreq.imr_interface.s_addr = INADDR_ANY; // use DEFAULT interface // JOIN multicast group on default interface setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP...
socket.setsockopt(level, optname, None, optlen: int) Set the value of the given socket option (see the Unix manual page setsockopt(2)). The needed symbolic constants are defined in the socket module (SO_* etc.). The value can be an integer, None or a bytes-like object representing a...
all of the processes binding to the same address must have the same effective UID. This option...
#!/usr/bin/python3 #_*_coding:utf-8_*_ #__author__ = 'Tengbibo' import socket import subprocess ip_port = ('127.0.0.1',6969) BUFSIZE = 1024 tcp_socket_server = socket.socket() tcp_socket_server.setsockopt(SOL_SOCKET,SO_REUSEADDR,1) tcp_socket_server.bind(ip_port) tcp_socket_se...
一:Linux版本<3.9 此时的Linux系统只有SO_REUSEADDR选项存在,他的用法和BSD基本上是相同的,除了以下两个重要的区别. 区别1:一旦某个端口号被一个listen tcp socket(服务器)绑定上了,那么这个端口就不能再被其他socket绑定了,即使设置了SO_REUSEADDR也不能绑定到上。
尽管通过网络验证一个远程用户标识是非常困难的,但是在同一个主机验证另一个用户对于Linux内核而言却是一件很简单的事情。这就使得PF_LOCAL/PF_UNIX为另一个端的接收端提供关于用户的证书成为可能。这些证书和解的唯一方法也许就在于内核本身会以一定的方式和解(也许是通过一个内核可装载模块)。
SO_ERROR yes DWORD Returns the last error code on this socket. This per-socket error code is not always immediately set. SO_EXCLUSIVEADDRUSE yes yes DWORD (boolean) Prevents any other socket from binding to the same address and port. This option must be set before calling the bind function...
intsfd=socket(domain,socktype,0); intoptval=1; setsockopt(sfd,SOL_SOCKET,SO_REUSEPORT,&optval,sizeof(optval)); bind(sfd,(structsockaddr*)&addr,addrlen); So long as thefirstserver sets this option before binding its socket, then any number of other servers can also bind to the same por...
#如果端口号正在使用、主机名不正确或端口已被保留,bind方法将引发socket.error异常。 #例: ('192.168.1.1',9999) 1. 2. 3. 4. 3 监听套接字 s1.listen( backlog ) #backlog指定最多允许多少个客户连接到服务器。它的值至少为1。收到连接请求后,这些请求需要排队,如果队列满,就拒绝请求。
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