[POSIX & Win32API] Getting the 'routing' informations

I have a binded datagram/packet socket. Is it possible to get an
information should I send a packet with given sockaddr through this
socket?

I'd like to have at most 2 codes - for BSD sockets and winsock2.

PS. Sample pseudocode:
int test_socket (SOCKET s, struct sockaddr *sockaddr, socklen_t socklen)
{
/* ... */
}

Regards
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