lock/unlock user space addresses in memory
() functions respectively lock and
unlock a range of addresses belonging to the currently running process into
memory. The actual amount of memory locked is a multiple of the machine's page
size. The starting page number is computed by truncating
to the nearest preceding page boundary,
and by rounding up addr +
to the next page boundary. The process
context to use for this operation is taken from the global variable
() function will return 0 on
success, otherwise it will return one of the errors listed below.
() function will fail if:
- The addr and
len parameters specify a memory range
that wraps around the end of the machine address space.
- The size of the specified address range exceeds the system limit on locked
- Some portion of the indicated address range is not allocated. There was an
error faulting/mapping a page.