The rewind() function sets the file position indicator for the stream pointed to by stream to the beginning of the file. It is equivalent to:

Stdlib.fseek(stream, 0, SeekFlags.SEEK_SET)

except that the error indicator for the stream is also cleared (see Stdlib.clearerr(3)).

Since rewind() does not return a value, an application wishing to detect errors should call Stdlib.SetLastError((Mono.Unix.Native.Error)0), then call rewind(), and if Stdlib.GetLastError is non-zero, assume an error has occurred.