linux 1.x/libc4 had writev implemented in libc, with no kernel support. This implementation was, to put it kindly, "marginal". I think libc5 added code to check if you had SYS_writev and use it, if not, fall back to the old code. I'm not sure which kernel actually added the writev syscall, nor am I sure of how good it is. There are some subtle "corner" cases which are hard to get right.
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