The function dio_seek() is used to change the file position of the given file descriptor.
The file descriptor returned by dio_open().
The new position.
Specifies how the position pos should be interpreted:
SEEK_SET (default) - specifies that pos is specified from the beginning of the file.
SEEK_CUR - Specifies that pos is a count of characters from the current file position. This count may be positive or negative.
SEEK_END - Specifies that pos is a count of characters from the end of the file. A negative count specifies a position within the current extent of the file; a positive count specifies a position past the current end. If you set the position past the current end, and actually write data, you will extend the file with zeros up to that position.
Example 1. Positioning in a file