/***********************************************************************
* Sandbox for online judge
* author: lei
*
* Support apparmor and ptrace.
* When using ptrace:
* please link the sandboxed program statically 
*     gcc -o demoexe -static demoexe.c
*
* When using apparmor:
* you need to install apparmor and set executable file's setuid-bit
*     >sudo chown root sandbox
*     >sudo chmod u+s sandbox
*
* cpu time unit is 1S
* memory unit is 1KB
* fsize unit is 1B
************************************************************************/

NOTICES

1.Here is a sample configuration file:
file    /home/lei/demoexe
cpu     1
mem     2048
fsize   1024
in      /home/lei/file.in
out     /home/lei/file.out
err     /home/lei/file.err
sandbox apparmor 

flist
/home/lei/data rw
/home/lei/file.in r

2.About output limit:
You can use shell create_dir.sh to create a directory of a specified size.
Here is a sample for creating a directory of 1M:
    ./create_dir.sh  /home/file.img  /home/data_dir 1

Use umount before you delete the directory:
    sudo umount /home/data_dir