Date: Thu, 17 Mar 2005 14:55:11 -0500 From: Aziz KEZZOU <opensource.enthousiat@gmail.com> To: John-Mark Gurney <gurney_j@resnet.uoregon.edu>, Aziz KEZZOU <opensource.enthousiat@gmail.com>, freebsd-hackers@freebsd.org Subject: Re: How to send a signal from inside the kernel? Message-ID: <37e1316605031711555c47c8ca@mail.gmail.com> In-Reply-To: <20050317181200.GK89312@funkthat.com> References: <37e13166050317093477de8f7a@mail.gmail.com> <20050317181200.GK89312@funkthat.com>
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> Aziz KEZZOU wrote this message on Thu, Mar 17, 2005 at 12:34 -0500:
> > Hi all,
> > I would like to send a signal (e.g SIGUSR1) to a user process from
> > inside the kernel (kld module).
> > Can any one tell me how to do it ?
> > I tried the following code inspired from sys/kern/kern_sig.c :
> > ==============================================================
> > #include <sys/types.h>
> > #include <sys/signal.h>
> >
> > int process_pid;
> > struct kill_args {
> > int pid;
> > int signum;
> > };
> >
> > void send_SIGUSR1() {
> > struct kill_args uap;
> > uap.pid = process_pid;
> > uap.signum = SIGUSR1;
> > kill((struct thread *)0, &uap);
> > }
> > ===============================================================
> >
> > but that causes a page fault in kernel mode (ie. Kernel panic :-)
> >
> > Any help is appreciated, thanks.
>
> Take a look at psignal(9)... You'll need to look up the struct proc
> for psignal with pfind(9)... and then PROC_UNLOCK the struct proc
> after you've used psignal...
>
> so:
> struct proc *p;
>
> p = pfind(pid);
> if (p != NULL) {
> psignal(p, SIGUSR1);
> PROC_UNLOCK(p);
> }
>
> I haven't tried the code above, but that should do what you want...
It works, thanks a lot !!
Here are the headers needed in case someone reads this thread:
#include <unistd.h> /*needed only for NULL, can be removed*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
Have fun,
Aziz
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