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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