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Re: [Qemu-devel] SIGUSR1 handle within QEMU


From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] SIGUSR1 handle within QEMU
Date: Mon, 8 Apr 2013 14:23:25 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

On Fri, Apr 05, 2013 at 06:30:02AM +0000, Lal Nitesh-B44382 wrote:
> I was trying to figure out how SIGUSR1 is been handled by QEMU as I am 
> getting multiple SIGUSR1 in my trace when I run the guest  .
> If anyone could guide me on this, that would be of great help.

Use grep:

$ git grep SIGUSR1
include/qemu/main-loop.h:#define SIG_IPI SIGUSR1
$ git grep SIG_IPI
cpus.c:    sigaddset(&waitset, SIG_IPI);
cpus.c:    } while (sigismember(&chkset, SIG_IPI) ||
sigismember(&chkset, SIGBUS));
cpus.c:    sigaction(SIG_IPI, &sigact, NULL);
cpus.c:    sigdelset(&set, SIG_IPI);
cpus.c:    sigaction(SIG_IPI, &sigact, NULL);
cpus.c:    sigaddset(&set, SIG_IPI);
cpus.c:    sigaddset(&waitset, SIG_IPI);
cpus.c:    err = pthread_kill(cpu->thread->thread, SIG_IPI);
include/qemu/main-loop.h:#define SIG_IPI SIGUSR1
main-loop.c:     * SIG_IPI must be blocked in the main thread and must
not be caught
main-loop.c:    sigaddset(&set, SIG_IPI);
main-loop.c:    sigdelset(&set, SIG_IPI);

SIGUSR1 is used to notify vcpu threads.

If SIGUSR1 keeps stopping gdb:
$ cat ~/.gdbinit
handle SIGUSR1 noprint nostop pass

Stefan



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