On Sat, Mar 1, 2014 at 8:34 AM, Adam Lackorzynski <adam@os.inf.tu-dresden.de
wrote:
I think there is a trick to launch this tiff application over
L4/fiasco, so the kernel can permit the application to create a file.
Per default, there's no writable directory available. You can use tmpfs. Add the following in your application's Makefile: REQUIRES_LIBS += libmount libl4revfs-fs-tmpfs
Then add a fstab file, with this content (usual syntax):
/ /tmp tmpfs defaults
The last thing to do is to tell your application where to find the fstab file. You need a config file for that, with this content:
L4.default_loader:start({}, "rom/tiff_test2", { FSTAB_FILE = "rom/fstab" });
Do not forget to change your module.list entry, add ned and put "roottask moe rom/config.cfg" there instead of the --init version.
Now you should be able to write in /tmp in your application.
I did the instruction above. It seems like the application could write in /tmp directory. But I'm curious which /tmp directory that the application use to create the file? Since I couldn't find the created file anywhere. Is it by any chance located in /tmp of the running application? If it's the case, Is there any other way to access the created file that has been created by my application?
regards,
Irvanda