- macOS 10.4+
The mbuf chain to copy data out of.
The offset in to the mbuf to start copying.
The number of bytes to copy.
A pointer to the location where the data will be copied.
0 upon success otherwise the errno error.
Copies data out of an mbuf in to a specified buffer. If the data is stored in a chain of mbufs, the data will be copied from each mbuf in the chain until length bytes have been copied.