ClaimBuffer

Declaration

virtual kern_return_t ClaimBuffer(uint64_t *addr, uint64_t *len);

Parameters

• addr:

  Address of the mapped buffer

• len:

  The length of the mapped buffer. This is same value as the max_len in the Create() function

Return Value

0 in case of success. Negative in case of an error.

Discussion

This function is called to get a pointer to the ext paniclog buffer

After this function is called, the user is responsible for copying data into the buffer. The entire buffer is copied when a system panics. After claiming the buffer, YieldBuffer() has to be called to set the used_len of the buffer before calling InsertData() or AppendData()