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+PR_CreateFileMap
+================
+
+Creates a file mapping object.
+
+
+Syntax
+------
+
+.. code::
+
+   #include <prio.h>
+
+   PRFileMap* PR_CreateFileMap(
+     PRFileDesc *fd,
+     PRInt64 size,
+     PRFileMapProtect prot);
+
+
+Parameters
+~~~~~~~~~~
+
+The function has the following parameters:
+
+``fd``
+   A pointer to a :ref:`PRFileDesc` object representing the file that is to
+   be mapped to memory.
+``size``
+   Size of the file specified by ``fd``.
+``prot``
+   Protection option for read and write accesses of a file mapping. This
+   parameter consists of one of the following options:
+
+    - :ref:`PR_PROT_READONLY`. Read-only access.
+    - :ref:`PR_PROT_READWRITE`. Readable, and write is shared.
+    - :ref:`PR_PROT_WRITECOPY`. Readable, and write is private
+      (copy-on-write).
+
+
+Returns
+~~~~~~~
+
+-  If successful, a file mapping of type :ref:`PRFileMap`.
+-  If unsuccessful, ``NULL``.
+
+
+Description
+-----------
+
+The ``PRFileMapProtect`` enumeration used in the ``prot`` parameter is
+defined as follows:
+
+.. code::
+
+   typedef enum PRFileMapProtect {
+     PR_PROT_READONLY,
+     PR_PROT_READWRITE,
+     PR_PROT_WRITECOPY
+   } PRFileMapProtect;
+
+:ref:`PR_CreateFileMap` only prepares for the mapping a file to memory. The
+returned file-mapping object must be passed to :ref:`PR_MemMap` to actually
+map a section of the file to memory.
+
+The file-mapping object should be closed with a :ref:`PR_CloseFileMap` call
+when it is no longer needed.