Hello all!
I need to be able to start and manage several user-processes from a
kernel module.
By managing, i mean, read the process output, wait for its end, kill it
sooner if needed.
It looks like the mecanisms offered by call_usermodehelper() but, more
sophisticated.
I did some code, looking a lot to that what is done in
call_usermodehelper() but I'm facing more and more issues.
I'm near achieving that, but the more I work on this, the more I need
user-space related stuff, like some syscalls, and functions that are
intended to be used only from userspace. I know this is not really good
but at first, I just thought I would have need very few of them... but
it does not seem the case.
So my questions are:
1 - Is it normal some functions like sys_setsid, do_sigaction,
sys_pipe, ... (used in various places in kernel) are only intended to be
used in kernel, and not in modules (no export_symbol for them)?
2 - How will you do to solve my first problem, start and manage
userspace processes from kernel?
3 - Is the only solution to code a userspace daemon for doing that, and
just use a mechanism to communicate between this daemon and the kernel?
This will split my work in two parts, and I'm not very fond of this
solution...
Thanks in advance for you help
Aurélien
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