munlock()

Unlock the range of process address space already allocated

Synopsis:

#include <sys/mman.h>

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

Arguments:

addr

The starting address for the range of process address space.

len

The length of the memory buffer, in bytes.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The munlock() function unlocks the pages already locked by mlock() or mlockall(). It ignores how many times mlock() has been called before.

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The full POSIX implementation for this function was added in the QNX Neutrino Core OS 6.3.2.

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The munlock() function doesn't affect those pages that have been mapped and locked into the address spaces of other processes.

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Memory-resident is a term used to indicate that the addresses always reside in physical memory.

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Returns:

0

Success.

-1

An error has occurred (errno is set).

Errors:

ENOMEM

Some or all of the address range specified by the addr and len arguments doesn't correspond to valid mapped pages in the address space of the process.

Classification:

POSIX 1003.1 MLR

See also:

mlock(), mlockall()