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

NAME
     vslock, vsunlock -- lock/unlock user space	addresses in memory

SYNOPSIS
     #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);

DESCRIPTION
     The vslock() and vsunlock() functions respectively	lock and unlock	a
     range of addresses	belonging to the currently running process into	mem-
     ory.  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:

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

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

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

FreeBSD	10.1			August 29, 2012			  FreeBSD 10.1

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS

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