$$% Arcus cosine. \def\acos{\cos^{-1}} % Vector projection. \def\projection#1#2{{proj_{#1}\left(#2\right)}} % Vector rejection. \def\rejection#1#2{{rej_{#1}\left(#2\right)}} % Norm. \def\norm#1{{\left\|#1\right\|}} % Cross product. \def\cross#1#2{\mathit{cross}\left(#1,#2\right)} % Dot product. \def\dot#1#2{{#1 \cdot #2}} % Magnitude. \def\mag#1{{\left|#1\right}} \def\group#1{\left(#1\right)}} \def\sbgrp#1{\left\{#1\right\}}$$

## Ring1_FileSystem_ExistingFilePolicy

An enumeration of policies for handling the situation in which an existing file is opened.

 typedef Ring1_FileSystem_ExistingFilePolicy {   ... } Ring1_FileSystem_ExistingFilePolicy; 

An enumeration of policies for handling the situation in which an existing file is opened.

### Enumeration Elements

Ring1_FileSystem_ExistingFilePolicy_Retain
Retain the file.
Ring1_FileSystem_ExistingFilePolic_Truncate
Truncate the file.