MSDN Library

_filelength, _filelengthi64

Gets the length of a file.

long _filelength( 
   int fd 
__int64 _filelengthi64( 
   int fd 


Target the file descriptor.

Both _filelength and _filelengthi64 return the file length, in bytes, of the target file associated with fd. If fd is an invalid file descriptor, this function invokes the invalid parameter handler, as described in Parameter Validation. If execution is allowed to continue, both functions return –1L to indicate an error and set errno to EBADF.


Required header





For more compatibility information, see Compatibility in the Introduction.

See the example for _chsize.

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