Date: Thu, 17 Mar 2005 10:12:00 -0800 From: John-Mark Gurney <gurney_j@resnet.uoregon.edu> To: Aziz KEZZOU <opensource.enthousiat@gmail.com> Cc: freebsd-hackers@freebsd.org Subject: Re: How to send a signal from inside the kernel? Message-ID: <20050317181200.GK89312@funkthat.com> In-Reply-To: <37e13166050317093477de8f7a@mail.gmail.com> References: <37e13166050317093477de8f7a@mail.gmail.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...
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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