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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 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.
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