FS_FileSeek

FS_FileSeek(
 PIOREQ pir
 )

The current file position is set or obtained through FS_FileSeek. This routine handles the Win32 function GetFileSize(); and INT 21h functions: 23h, and 42h.

ir_rh

Supplies handle to disk volume or network resource that contains the file.

ir_fh

Supplies FSD file handle.

ir_sfn

Supplies system file number.

ir_flags

Supplies the type of seek method to perform.

Seek Method Values: One of the following seek methods will be specified.
Value	Meaning
FILE_BEGIN	Position is an absolute offset from the beginning of the file.
FILE_END	Position is a signed offset relative to the end of the file.

ir_pos

Supplies the file seek offset.

ir_user

Supplies user ID for this request.

ir_pid

Supplies process ID for this request.

ir_error	Returns status of the operation ( 0 if no error, errorcode otherwise ).
ir_pos	Returns the current file position.

The FILE_BEGIN method is provided as an optimization only and may otherwise be ignored. The idea is simply to allow the FSD to do read-ahead based on this information if it chooses to. There is no guarantee that file I/O will take place at the passed file position however.