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RedHat 9 (Linux i386) - man page for munlock (redhat section 2)

MUNLOCK(2)			    Linux Programmer's Manual			       MUNLOCK(2)

NAME
       munlock - reenable paging for some parts of memory

SYNOPSIS
       #include <sys/mman.h>

       int munlock(const void *addr, size_t len);

DESCRIPTION
       munlock	reenables  paging  for	the  memory in the range starting at addr with length len
       bytes. All pages which contain a part of the specified  memory  range  can  after  calling
       munlock be moved to external swap space again by the kernel.

       Memory  locks  do  not stack, i.e., pages which have been locked several times by calls to
       mlock or mlockall will be unlocked by a single call to munlock for the corresponding range
       or  by  munlockall.   Pages  which are mapped to several locations or by several processes
       stay locked into RAM as long as they are locked at least at one location or  by	at  least
       one process.

       On POSIX systems on which mlock and munlock are available, _POSIX_MEMLOCK_RANGE is defined
       in <unistd.h> and the value PAGESIZE from <limits.h> indicates the  number  of  bytes  per
       page.

RETURN VALUE
       On  success,  munlock returns zero.  On error, -1 is returned, errno is set appropriately,
       and no changes are made to any locks in the address space of the process.

ERRORS
       ENOMEM Some of the specified address range does not correspond  to  mapped  pages  in  the
	      address space of the process.

       EINVAL len was not a positive number.

CONFORMING TO
       POSIX.1b, SVr4

SEE ALSO
       mlock(2), mlockall(2), munlockall(2)

Linux 1.3.43				    1995-11-26				       MUNLOCK(2)


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