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Man Pages
VSLOCK(9) FreeBSD Kernel Developer's Manual VSLOCK(9)

vslock, vsunlock
lock/unlock user space addresses in memory

#include <sys/param.h>
#include <sys/proc.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
int
vslock(void *addr, size_t len);
void
vsunlock(void *addr, size_t len);

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.

The vslock() function will return 0 on success, otherwise it will return one of the errors listed below.

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.
[]
Some portion of the indicated address range is not allocated. There was an error faulting/mapping a page.
August 29, 2012 FreeBSD 12.0-RELEASE

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