2002-08-27  Conrad Scott  <conrad.scott@dsl.pipex.com>

	* fhandler.h (fhandler_base::readv): New method.
	(fhandler_base::writev): Ditto.
	(fhandler_socket::read): Remove method.
	(fhandler_socket::write): Ditto.
	(fhandler_socket::readv): New method.
	(fhandler_socket::writev): Ditto.
	(fhandler_socket::recvmsg): Add new argument.
	(fhandler_socket::sendmsg): Ditto.
	* fhandler.cc (fhandler_base::readv): New method.
	(fhandler_base::writev): Ditto.
	* fhandler_socket.cc (fhandler_socket::read): Remove method.
	(fhandler_socket::write): Remove method.
	(fhandler_socket::readv): New method.
	(fhandler_socket::writev): New method.
	(fhandler_socket::recvfrom): Use winsock2 calls if possible.
	(fhandler_socket::sendto): Ditto.
	(fhandler_socket::recvmsg): Rewrite to use winsock2 calls and
	avoid copying the iovec buffers if possible.
	(fhandler_socket::sendmsg): Ditto.
	* syscalls.cc (_read): Delegate to readv(2).
	 (_write): Delegate to writev(2).
	(readv): Rewrite, based on the old _read code, to use the new
	fhandler_base::readv method.
	(writev): Ditto, mutatis mutandi.
	* net.cc (cygwin_recvmsg): Error check the incoming iovec and
	match new fhandler_socket::recvmsg signature.
	(cygwin_sendmsg): Ditto, mutatis mutandi.  Add missing sigframe.
	* include/sys/uio.h (struct iovec): Change field types to match
	SUSv3.
	* winsup.h (check_iovec_for_read): New function.
	(check_iovec_for_write): Ditto.
	* miscfuncs.cc (check_iovec_for_read): Ditto.
	(check_iovec_for_write): Ditto.