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vslock.9freebsd

BSD mandoc

NAME

vslock vsunlock - lock/unlock user space addresses in memory

SYNOPSIS

In sys/param.h In sys/proc.h In vm/vm.h In vm/vm_extern.h Ft int Fn vslock void *addr size_t len Ft void Fn vsunlock void *addr size_t len

DESCRIPTION

The Fn vslock and Fn 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 Fa addr to the nearest preceding page boundary, and by rounding up Fa addr + Fa len to the next page boundary. The process context to use for this operation is taken from the global variable curproc

RETURN VALUES

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

ERRORS

The Fn vslock function will fail if:

Bq Er EINVAL

The Fa addr and Fa len parameters specify a memory range that wraps around the end of the machine address space.

Bq Er ENOMEM

The size of the specified address range exceeds the system limit on locked memory.

Bq Er ENOMEM

Locking the requested address range would cause the process to exceed its per-process locked memory limit.

Bq Er EFAULT

Some portion of the indicated address range is not allocated. There was an error faulting/mapping a page.