table of contents
|VSLOCK(9)||Kernel Developer's Manual||VSLOCK(9)|
NAME¶vslock, vsunlock — lock/unlock user space addresses in memory
#include <vm/vm_extern.h> int
vslock(void *addr, size_t len); void
vsunlock(void *addr, size_t len);
DESCRIPTION¶The vslock() and vsunlock() 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 addr to the nearest preceding page boundary, and by rounding up addr + len to the next page boundary. The process context to use for this operation is taken from the global variable curproc.
RETURN VALUES¶The vslock() function will return 0 on success, otherwise it will return one of the errors listed below.
ERRORS¶The vslock() 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 memory.
- Locking the requested address range would cause the process to exceed its per-process locked memory limit.
- Some portion of the indicated address range is not allocated. There was an error faulting/mapping a page.
|August 10, 2004||Debian|