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The existing implementation used the same logic as is found in mach_msg_server(), but that logic seems incorrect. When the caller wants to retry a mach_msg() receive of a too-large message that returns MACH_RCV_TOO_LARGE, there’s no harm in attempting the receive with a larger buffer initially. On the other hand, if the caller does not want to retry such mach_msg() receive attempts, it’s an indication that the caller is expecting to be intolerant of too-large messages, and there’s no need to attempt the receive with a buffer any larger than requested. TEST=util_test R=rsesek@chromium.org Review URL: https://codereview.chromium.org/753363003