I want to be able to reuse some ports, and that's why I'm using setsockopt on my sockets, with the following code: sock.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1) However, this doesn't really work. I'm not getting a bind error either, but the server socket just isn't responding (it seems to start , but if I try to connect to ...
Ok, I'm still new to using C sockets, but I was wondering if there is a way to extract the IP address adding running setsockopt? If you'll look at my code below, I have everything in my multicast sockets ready to send except for defining the variable mc_addr which is my IP address. Am I doing anything wrong that's real noticeable? If so,...
Hi, I'm fighting with raw sockets in Win32 and now I'm stuck, the soetsockopt funtion give me the 10022 error (invalid argument), but I think I pass the correct arguments... of course I'm wrong u_u' sock = socket(AF_INET,SOCK_RAW,IPPROTO_UDP); if (sock == SOCKET_ERROR) { printf("Error socket(): %d", WSAGetLastError()); return; } ch...
I'm doing some lovely socket programming in objective-C right now and part of my code is giving me an error (in the setsockopt method call). I was wondering if anyone knows of a similar function to the GetLastError() function in C++ that I could use in objective-C to determine the problem with my code? ...
I'd like to test whether particular socket options have been set on an existing socket. Ie, pretty much everything you can see in: #!/usr/bin/env python '''See possible TCP socket options''' import socket sockettypelist = [x for x in dir(socket) if x.startswith('SO_')] sockettypelist.sort() for sockettype in sockettypelist: print...
I have the following code: if ( ( m_mainSocket = ::socket( PF_INET, SOCK_STREAM, IPPROTO_TCP ) ) < 0 ) { throw Exception( __FILE__, __LINE__ ) << "Unable to create socket"; } int on( 0 ); if ( setsockopt( m_mainSocket, SOL_SOCKET, SO_REUSEADDR, &on, sizeof( on ) ) ) { throw Exception( __FILE__, __LINE__ ) << "Can't make server...
I am running a Linux box running 2.6.9-55.ELsmp, x86_64. I am trying to set the TCP receive window by using the setsockopt() function using C. I try the following: rwnd = 1024; setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char *)&rwnd, sizeof(rwnd)); The code segment above is in a client program that receives data from a server. When I k...
The prototype for setsockopt is: int setsockopt(int socket, int level, int option_name, const void *option_value, socklen_t option_len); Are the following all correct ? Which are not ? a.) int buffsize = 50000; setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&buffsize, sizeof(buffsize)); b.) int buffsize = 50000; setsockopt(s, SOL_SOCKE...
In IPv6 networking, the IPV6_V6ONLY flag is used to ensure that a socket will only use IPv6, and in particular that IPv4-to-IPv6 mapping won't be used for that socket. On many OS's, the IPV6_V6ONLY is not set by default, but on some OS's (e.g. Windows 7), it is set by default. My question is: What was the motivation for introducing th...
Hello, everyone! I need help! I have a code in which send multicast datagrams. A critical piece of code: uint32_t port; int sockfd, err_ip; const uint32_t sizebuff = 65535 - (20 + 8); unsigned char *buff = (unsigned char *) malloc(sizebuff); struct sockaddr_in servaddr, cliaddr; struct in_...
From Linux man page: SO_REUSEADDR Specifies that the rules used in validating addresses supplied to bind() should allow reuse of local addresses, if this is supported by the protocol. This option takes an int value. This is a Boolean option When should I use it? Why does "reuse of local addresses" give? Thanks, Ray ...