Date: Mon, 23 Jul 2001 21:27:06 -0500 From: y-carden@uniandes.edu.co To: hackers@FreeBSD.org Cc: questions@FreeBSD.org Subject: Invoking a userland function from kernel Message-ID: <M2001072321270608082@vaca.uniandes.edu.co>
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Dear Friends
I'm incorporating the Real Time Protocol RTP (rfc 1889) to
FreeBSD 4.0 kernel.
Months ago, I compiled successfully the RTP Library API developed
by Lucent into the FreeBSD kernel with the right logical and technical
adjustments for the BSD kernel of course (copyin, copyout, malloc, etc).
I have changed many of the original API library functions
to kernel systems calls, and it works fine.
Now, I need invoke a userland function with several parameters
from the a function into the kernel.
How I can do?
Do you know a example?
I need to do this :
/* ---- In the kernel function ----- */
void MyKernelFuntion(){
int id;
void *opaque;
struct timeval *tp;
/* ... */
MyUserlandFunction (id, opaque, tp);
/* ... */
}
/* ---- In the userland ----- */
void MyUserlandFunction (int id, void *opaque, struct timeval *tp)
int value = id * K + P;
/* ... */
return;
}
/* ----- end ----- */
I don't need return data from userland function to kernel later.
Well, MyKernelFunction() is only invoked for system calls that
the userland process with MyUserlandFunction() have done before, of
course.
In other words, MyUserlandFuntion() is into the same userland process that
invoke the system calls that call to MyKernelFunction().
Thanks for your help.
+------------------------+
YONNY CARDENAS B.
Systems Engineer
y-carden@uniandes.edu.co
Student M.Sc.
UNIVERSIDAD DE LOS ANDES
Santafe de Bogota D.C
Colombia - South America
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