I wanted to verify that the size of a multicast UDP message received with recvmsg matches the size of the message the kernel thinks the message is.
So I went about using the FIONREAD ioctl as follows: res = ioctl (fd, FIONCREAD, &value); assert (res != -1); bytes_received = recvmsg (fd, &msg_recv, MSG_NOSIGNAL | MSG_DONTWAIT); assert (bytes_received == value); It appears the value and bytes_received do not match after many thousands of runs with a UDP multicast protocol (www.openais.org). (neither is -1) Am I using this ioctl improperly? Shouldn't I expect that the full datagram is returned by recvmsg no matter the state of the blocking or nonblocking mode of the file descriptor? pls copy me on responses - i am not onlist. Regards -steve - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
