SDK
- macOS 10.4+
Framework
- Kernel
Declaration
errnoParameters
mbufThe mbuf to prepend data to. This may change if a new mbuf must be allocated or may be NULL if the operation fails.
lenThe length, in bytes, to be prepended to the mbuf.
howBlocking or non-blocking.
Return Value
0 upon success otherwise the errno error.
Discussion
Prepend len bytes to an mbuf. If there is space (mbuf_leadingspace >= len), the mbuf's data ptr is changed and the same mbuf is returned. If there is no space, a new mbuf may be allocated and prepended to the mbuf chain. If the operation fails, the mbuf may be freed (*mbuf will be NULL).