Datasheet

The C and C++ Libraries
4-82 Copyright © 1999-2001 ARM Limited. All rights reserved. ARM DUI 0067D
4.10.7 _sys_ensure()
This function flushes buffers associated with a file handle.
Syntax
int _sys_ensure(FILEHANDLE fh)
Implementation
A call to
_sys_ensure() flushes any buffersassociated with file handle fh , and ensures
that the file is up to date on the backing store medium.
Returns
If an error occurs, the result is negative.
4.10.8 _sys_flen()
This function returns the current length of a file.
Syntax
long _sys_flen(FILEHANDLE fh)
Implementation
The function is required to convert
fseek(, SEEK_END) into (, SEEK_SET) asrequired by
_sys_seek() .
If
fseek() is used with an underlying system that does not directly support seeking
relative to the end of a file,
_sys_flen() must be defined. If the underlying system can
seek relative to the end of a file, you can define
fseek() so that _sys_flen() is not
required.
Returns
This function returns the current length of the file
fh , or a negative error indicator.