Markus Wilhelm Markus Wilhelm - 2 months ago 23
C Question

bind() fails with windows socket error 10049

I try to make a client/server program in C with IPv6 and UDP. When the program binds the socket it return the WSAError 10049. I know that this is a problem with the adress name but don't see whats the problem. I hope someone can help.

struct sockaddr_in6 server, client;
SOCKET sock;
char buffer[BUFFERSIZE];
LPTSTR recvBuff[1024];
DWORD recvBuffLen = 1024UL;
int len = sizeof(client);

WORD wVersionRequested;
WSADATA wsaData;
wVersionRequested = MAKEWORD(1,1);
WSAStartup(wVersionRequested, &wsaData);

sock = socket(AF_INET6, SOCK_DGRAM, 0);
if (sock < 0)
error("Fehler beim Anlegen des Sockets");

server.sin6_family = AF_INET6;
server.sin6_port = htons(6000);
server.sin6_addr = in6addr_any;

if (bind(sock, (struct sockaddr *) &server, sizeof(server)) == -1)
error("Fehler beim binden des Sockets");

Answer

This normally results from an attempt to bind to an address that is not valid for the local computer..

You should use PF_INET here instead of AF_INET. They have the same value, but you're not specifying an address family AF here, you're specifying a protocol family PF. This is just a style recommendation.

I would suggest to memset zero the below arrays,structures:

struct sockaddr_in6 server, client;
SOCKET sock;
char buffer[BUFFERSIZE];
LPTSTR recvBuff[1024];
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