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Bug #647 » vkhalt-HEAD.patch

c.turner, 06/17/2007 04:26 PM

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share/man/man7/vkernel.7 17 Jun 2007 04:05:58 -0000
.Xr tap 4
device.
.Sh SIGNALS
The virtual kernel enables all terminal signals while in
.Xr ddb 4
mode but only enables
The virtual kernel only enables
.Dv SIGQUIT
and
.Dv SIGTERM
while operating in regular console mode.
Sending
.Ql \&^\e
.Pq Dv SIGQUIT
while operating as a console which causes the virtual kernel to enter its
internal
to the virtual kernel causes the virtual kernel to enter its internal
.Xr ddb 4
debugger.
debugger and re-enable all other terminal signals.
Sending
.Dv SIGTERM
to the virtual kernel triggers a clean shutdown by passing a
.Dv SIGUSR2
to the virtual kernel's
.Xr init 8
process.
.Sh DEBUGGING
It is possible to directly gdb the virtual kernel's process.
It is recommended that you do a
sys/platform/vkernel/i386/exception.c 16 Jun 2007 23:08:05 -0000
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/reboot.h>
#include <ddb/ddb.h>
#include <sys/thread2.h>
......
static void exc_debugger(int signo, siginfo_t *info, void *ctx);
#endif
/* signal shutdown thread misc. */
static void sigshutdown_daemon( void );
static struct thread *sigshutdown_thread;
static struct kproc_desc sigshut_kp = {
"sigshutdown", sigshutdown_daemon, &sigshutdown_thread
};
void
init_exceptions(void)
{
......
sigemptyset(&sa.sa_mask);
sigaction(SIGSEGV, &sa, NULL);
sigaction(SIGTRAP, &sa, NULL);
#ifdef DDB
sa.sa_sigaction = exc_debugger;
sigaction(SIGQUIT, &sa, NULL);
#endif
bzero(&sa, sizeof(sa));
sigemptyset(&sa.sa_mask);
sa.sa_flags |= SA_MAILBOX | SA_NODEFER;
sa.sa_mailbox = &mdcpu->gd_shutdown;
sigaction(SIGTERM, &sa, NULL);
}
/*
......
splz();
}
/*
* This function runs in a thread dedicated to external shutdown signals.
*
* Currently, when a vkernel recieves a SIGTERM, either the VKERNEL init(8)
* is signaled with SIGUSR2, or the VKERNEL simply shuts down, preventing
* fsck's when the VKERNEL is restarted.
*/
static void
sigshutdown_daemon( void )
{
while (mdcpu->gd_shutdown == 0) {
tsleep(&mdcpu->gd_shutdown, 0, "sswait", 0);
}
mdcpu->gd_shutdown = 0;
kprintf("Caught SIGTERM from host system. Shutting down...\n");
if (initproc != NULL) {
ksignal(initproc, SIGUSR2);
}
else {
reboot(RB_POWEROFF);
}
}
SYSINIT(sigshutdown, SI_BOOT2_PROC0, SI_ORDER_ANY,
kproc_start, &sigshut_kp);
#ifdef DDB
static void
sys/platform/vkernel/include/globaldata.h 10 Jun 2007 21:10:26 -0000
int gd_spending; /* software interrupt pending */
int gd_sdelayed; /* delayed software ints */
int gd_currentldt;
int gd_mailbox; /* signal delivery mailbox */
int gd_mailbox; /* I/O signal delivery mailbox */
int gd_shutdown; /* Shutdown signal delivery mailbox */
u_int unused001;
u_int gd_other_cpus;
u_int gd_ss_eflags;
sys/platform/vkernel/platform/kqueue.c 17 Jun 2007 16:19:18 -0000
int n;
int i;
/*
* we only need to wake up our shutdown thread once.
* Keep it non-zero so the shutdown thread can detect it.
*/
if (mdcpu->gd_shutdown > 0) {
mdcpu->gd_shutdown = -1;
wakeup(&mdcpu->gd_shutdown);
}
if (gd->gd_mailbox == 0)
return;
gd->gd_mailbox = 0;
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