Date: Fri, 18 Mar 2005 14:22:33 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: John-Mark Gurney <gurney_j@resnet.uoregon.edu> Cc: freebsd-hackers@freebsd.org Subject: Re: How to send a signal from inside the kernel? Message-ID: <Pine.NEB.3.96L.1050318142023.87456J-100000@fledge.watson.org> In-Reply-To: <20050317181200.GK89312@funkthat.com>
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On Thu, 17 Mar 2005, John-Mark Gurney wrote:
> > 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...
Depending on the circumstances, it may also be appropriate to add an
access control check in the form:
error = p_cansignal(td, p);
if (error) {
PROC_UNLOCK(p);
return (error);
}
Where 'td' is the requesting thread, and 'p' is the target process.
Robert N M Watson
>
> 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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