Why does CMSG_ALIGN (sys/socket.h) exist?  Why not, instead, have the
kernel increase the cmsg_len values to whatever boundary it thinks
appropriate?  If nothing else, it would render the control-data byte
blob entirely self-contained; as it stands, a control-data byte blob
cannot, in general, be correctly interpreted without knowing the
appropriate alignment multiple for the machine it was generated on.
(It would also eliminate the need for __cmsg_alignbytes, which is
rather an aesthetic blemish.)

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