Add support for receiving ancillary data #444
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Two new methods are added in order to receive ancillary data along with normal data. The methods are
recv_with_ancillary_data
andrecv_vectored_with_ancillary_data_and_flags
. The former is easier to use, while the latter provides the flexibility.The implementation includes changes to the
recvmsg
function in thesys/unix.rs
file to handle the ancillary data.A new test case is also added to test the
recv_with_ancillary_data
method.