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(WSASendMsg): Define. * fhandler.h (class fhandler_socket): Change definition of recv_internal and send_internal to take WSAMSG pointer as parameter. * fhandler_socket.cc (WSAID_WSARECVMSG): Define. (LPFN_WSARECVMSG): Define. (WSASendMsg): Declare. (get_ext_funcptr): New function to fetch address of WSARecvMsg. (fhandler_socket::recv_internal): Take just a LPWSAMSG parameter. Change code accordingly. If control information is requested, fetch address of WSARecvMsg and use that instead of WSARecvFrom. (fhandler_socket::recvfrom): Change return type to ssize_t as declared in fhandler.h. Accommodate changes to recv_internal. (fhandler_socket::recvmsg): Ditto. Make sure that control information is only requested if system, address family, and socket type support it. (fhandler_socket::send_internal): Take just a LPWSAMSG parameter and the flags. Change code accordingly. If control information is provided, use WSASendMsg instead of WSASendTo. (fhandler_socket::sendto): Drop useless comment. Accommodate changes to send_internal. (fhandler_socket::sendmsg): Ditto. Make sure that control information is only provided if system, address family, and socket type support it. * wincap.h (wincaps::has_recvmsg): New element. (wincaps::has_sendmsg): New element * wincap.cc: Implement above elements throughout. * include/cygwin/socket.h (CMSG_ALIGN): Phrase in terms of alignment of type struct cmsghdr.
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