Problem with working directory

[Shrooms 00]

Even if I set the ddd working directory properly, fopen commands in the program
won't work properly unless I use the full path in them.
Like: 

fopen("tmp/test.txt"); 

will not work even if I change the directory to '/disk1/dir/dir2/dir3': only

fopen("/disk1/dir/dir2/dir3/tmp/test.txt");

works, and I can't afford to do this with every fopen in the program. How do I
make the program recognize the directory it's being executed on?

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