zx_clock_get_details_mapped

Summary

Fetch all of the low level details of a mapped clock‘s current state. Behaves identically to a call to zx_clock_get_details(), however it operates on a mapped clock’s state instead of a clock handle, and may offer performance benefits as it usually does not need to enter the Zircon kernel in order to perform the observation. See mappable clocks for more details.

Declaration

#include <zircon/syscalls.h>

zx_status_t zx_clock_get_details_mapped(const void* clock_addr,
                                        uint64_t options,
                                        void* details);

Rights

No handle is needed in order to perform a successful observation, therefore no specific handle rights are needed either. Instead, the user must provide the virtual address of a currently valid clock state mapping, established using zx_vmar_map_clock()

Description

Fetches the fine grained details of the mapped clock's state. See clocks Please refer to the current description of zx_clock_get_details() for more information, including an example.

Return value

On success, returns ZX_OK along with clock details stored in the details out parameter.

Errors

Any attempt to pass a virtual pointer for clock_addr which was:

Not the value returned by the original call to zx_clock_map().
A pointer to clock state which has been either partially, or completely, unmapped.

Will result in undefined behavior.