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The standardized version of readv() and writev() take an int as the third parameter. Arguably a size_t makes more sense, but the standardization bodies decided otherwise. The non-standard functions of readv_pos() and writev_pos() have been updated for consistency. The corresponding _kern_readv() and _kern_writev() internal functions continue to take the size_t parameter. The ABI will not change, even though on 64 bit machines the size of the count parameter will change from 8 to 4 bytes. The actual use will be slightly different. Like with the size_t argument type, it will not be possible to give a count lower than 0. If the value is less than 0, then the B_BAD_VALUE/EINVAL error will be set. Change-Id: I949c8ed67dbc0b4e209768cbdee554c929fc242e Reviewed-on: https://review.haiku-os.org/c/haiku/+/3770 Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>