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2014-06-20fix sendmmsg emulation return value for zero-length vectorRich Felker1-0/+1
this case is not even documented, but the kernel returns 0 here and it makes sense to be consistent.
2014-06-19implement sendmmsg and recvmmsgRich Felker1-0/+29
these are not pure syscall wrappers because they have to work around kernel API bugs on 64-bit archs. the workarounds could probably be made somewhat more efficient, but at the cost of more complexity. this may be revisited later.