ARM VERSION 1.2 Ficha Técnica descarregar pdf (Página 172)

The C and C++ Libraries

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

, 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()

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

, or a negative error indicator.

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ARM VERSION 1.2 Ficha Técnica Página 172