Hi,
I'm currently working on a project in which we are using UML to
access the host os and perform some operations.
More precisely, we would like to have a system call in UML that
parses a file in the host os.
Since the UML kernel is a host process, I naively thought that I
could use regular C directly. Indeed, I was able to create my system
call, and then have some other C files compiled using host os headers
such as <stdio.h> and <stdlib.h> by putting them in the USER_OBJS
list of the Makefile.
Unfortunately, I'm having some weird issues that I can't really
understand. I can read the file using fread, but only in a buffer
that I allocated using um_kmalloc. If I use a buffer allocated by
malloc, the fread fails. Then, even if I replace all my mallocs by
um_kmallocs, some libc functions (such as sscanf) don't seem to work
properly. I guess I'm missing something, but I can't figure out what.
If anyone of you can help me, I'd really appreciate,
With best regards,
Olivier
P.S.: I'm using 2.6.15.6 with the latest 2.6.15 patch and the guest
kernel runs in skas3 mode.
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