Actually, syscall oriented solutions merely move the problem around. You still wind up doing excessive numbers of syscalls. I would recommend providing the ability of using blocking sockets and let xrdcp run in blocking mode. Ideally, that would be with recv()+MSG_WAITALL (the most efficient option) but doing blocking reads could work as well with use of SO_RCVLOWAT and SO_RCVTIMEO setsockopt() setttings. While select/poll will dispatch you early (not ideal), at least you'll block until the right number of bytes arrive.

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