Wsaefault Error When Use Getsockname Function
I Have a Problem Using Getsockname Function. I Have This Code: Struct Sockaddr Sa; Int Sa_Len; Sa_Len = Sizeof(Sa); If (Getsockname(Socketfd, &Sa, &Sa_Len)! =...
I have a problem using getsockname function. I have this code:
struct sockaddr sa;
int sa_len;
sa_len = sizeof(sa);
if (getsockname(socketfd, &sa, &sa_len) != SOCKET_ERROR)
{
///
}
else
{
int error = WSAGetLastError();
//error here WSAEFAULT always
}
As you can see, i always have error when use getsockname function. Error - WSAEFAULT. But why? structure and structure size are right, why this happens?
WSAEFAULT desc:
The name or the namelen parameter is not a valid part of the user address space, or the namelen parameter is too small.
p.s. Application is 64 bit
Thanks!
2 Answers
Your struct sockaddr is too small to accept the socket address. Either use an appropriately sized struct, such as struct sockaddr_in, or better yet, use a struct sockaddr_storage, which is guaranteed to be large enough to contain the address. Using a sockaddr_storage also allows you to easily support both IPv4 and IPv6 with minimal adjustments.
Edited code:
struct sockaddr_storage sa;
int sa_len;
sa_len = sizeof(sa);
if (getsockname(socketfd, (struct sockaddr *)&sa, &sa_len) != SOCKET_ERROR)
Instead of general struct sockaddr use the one specified for your protocol i.e. *struct sockaddr_in* for IPv4 address. See here for a complete example.
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