# PRFileMap

Type returned by {ref}`PR_CreateFileMap` and passed to {ref}`PR_MemMap` and
{ref}`PR_CloseFileMap`.

## Syntax

```{code}
#include <prio.h>

typedef struct PRFileMap PRFileMap;
```

## Description

The opaque structure {ref}`PRFileMap` represents a memory-mapped file
object. Before actually mapping a file to memory, you must create a
memory-mapped file object by calling {ref}`PR_CreateFileMap`, which returns
a pointer to {ref}`PRFileMap`. Then sections of the file can be mapped into
memory by passing the {ref}`PRFileMap` pointer to {ref}`PR_MemMap`. The
memory-mapped file object is closed by passing the {ref}`PRFileMap` pointer
to {ref}`PR_CloseFileMap`.