Final Year Project:
Using Linux Filesystems Under Windows
Chris Bryden
BEng. Electronics and Software Engineering
School of Computer Science
University of Birmingham
53
The two values that are used are time and millitm
which hold the current time, in seconds since
00:00:00 GMT Jan 1st 1970, and the fractional part
of a second in milliseconds, respectively. The time
that it took to copy of the file is calculated by
subtracting the two recorded times. This is then used to calculate the average
transfer time by dividng the file size by the time taken to copy it.
The ext2_cp function returns an error code:
Error Code
Value
No Error
0
INODE_NOT_FOUND
1
BLK_LIST_ERR
2
OPEN_FILE_ERR
3
FILE_EXISTS
4
PATH_NOT_FOUND
5
5.27 The Cmdlin User Interface
The cmdlin user interface was developed alongside ext2lib for testing and
debugging purposes. It now forms the simple user interface used to demonstrate
the functions of ext2lib. It provides a very simple ‘command line in a window’ that
can be used to mount and navigate an ext2 filesystem. It was constructed in
Borland C’s EasyWin format. This allows a simple windows application to be
programmed as if it were a DOS application, however Borland C will compile the
application to run under Windows. This route was chosen because cmdlin
needed to be developed rapidly to test and debug ext2lib.
The source code for cmdlin is contained in the file cmdlin.c. Examining the
source shows a simple structure implementing the ext2lib functions to give
command line output. The main event loop is provided by a switch command
which executes small functions to perform the help, part, mount, cd, ls and cp
commands. The code is self-explanitory.
For instructions on using the cmdlin interface, please see appendix D
.
For more information on implementing the ext2lib.dll library in application
programs, please see the Ext2lib Programmers Implementation Guide’ in
appendix E.
struct timeb {
long time ;
short millitm ;
short _timezone ;
short dstflag ;
};
