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* fix sendmmsg emulation return value for zero-length vectorRich Felker2014-06-201-0/+1
| | | | | this case is not even documented, but the kernel returns 0 here and it makes sense to be consistent.
* implement sendmmsg and recvmmsgRich Felker2014-06-191-0/+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.