示例#1
0
static void
acpi_lid_notify_status_changed(void *arg)
{
    struct acpi_lid_softc	*sc;
    struct acpi_softc		*acpi_sc;

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);

    sc = (struct acpi_lid_softc *)arg;

    /*
     * Evaluate _LID and check the return value, update lid status.
     *	Zero:		The lid is closed
     *	Non-zero:	The lid is open
     */
    if (ACPI_FAILURE(acpi_EvaluateInteger(sc->lid_handle, "_LID", &sc->lid_status)))
	return_VOID;

    acpi_sc = acpi_device_get_parent_softc(sc->lid_dev);
    if (acpi_sc == NULL) {
        return_VOID;
    }

    ACPI_VPRINT(sc->lid_dev, acpi_sc,
	"Lid %s\n", sc->lid_status ? "opened" : "closed");

    if (sc->lid_status == 0) {
	EVENTHANDLER_INVOKE(acpi_sleep_event, acpi_sc->acpi_lid_switch_sx);
    } else {
	EVENTHANDLER_INVOKE(acpi_wakeup_event, acpi_sc->acpi_lid_switch_sx);
    }

    return_VOID;
}
示例#2
0
/*
 * Shutdown the system cleanly to prepare for reboot, halt, or power off.
 */
void
kern_reboot(int howto)
{
	static int once = 0;

#if defined(SMP)
	/*
	 * Bind us to CPU 0 so that all shutdown code runs there.  Some
	 * systems don't shutdown properly (i.e., ACPI power off) if we
	 * run on another processor.
	 */
	if (!SCHEDULER_STOPPED()) {
		thread_lock(curthread);
		sched_bind(curthread, 0);
		thread_unlock(curthread);
		KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
	}
#endif
	/* We're in the process of rebooting. */
	rebooting = 1;

	/* We are out of the debugger now. */
	kdb_active = 0;

	/*
	 * Do any callouts that should be done BEFORE syncing the filesystems.
	 */
	EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);

	/* 
	 * Now sync filesystems
	 */
	if (!cold && (howto & RB_NOSYNC) == 0 && once == 0) {
		once = 1;
		bufshutdown(show_busybufs);
	}

	print_uptime();

	cngrab();

	/*
	 * Ok, now do things that assume all filesystem activity has
	 * been completed.
	 */
	EVENTHANDLER_INVOKE(shutdown_post_sync, howto);

	if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 
		doadump(TRUE);

	/* Now that we're going to really halt the system... */
	EVENTHANDLER_INVOKE(shutdown_final, howto);

	for(;;) ;	/* safety against shutdown_reset not working */
	/* NOTREACHED */
}
示例#3
0
static void
set_rootvnode(void)
{
	struct proc *p;

	if (VFS_ROOT(TAILQ_FIRST(&mountlist), LK_EXCLUSIVE, &rootvnode))
		panic("Cannot find root vnode");

	VOP_UNLOCK(rootvnode, 0);

	p = curthread->td_proc;
	FILEDESC_XLOCK(p->p_fd);

	if (p->p_fd->fd_cdir != NULL)
		vrele(p->p_fd->fd_cdir);
	p->p_fd->fd_cdir = rootvnode;
	VREF(rootvnode);

	if (p->p_fd->fd_rdir != NULL)
		vrele(p->p_fd->fd_rdir);
	p->p_fd->fd_rdir = rootvnode;
	VREF(rootvnode);

	FILEDESC_XUNLOCK(p->p_fd);

	EVENTHANDLER_INVOKE(mountroot);
}
示例#4
0
static int
kern_do_pat(u_int utim)
{
	int error;

	if ((utim & WD_LASTVAL) != 0 && (utim & WD_INTERVAL) > 0)
		return (EINVAL);

	if ((utim & WD_LASTVAL) != 0) {
		MPASS((wd_last_u & ~WD_INTERVAL) == 0);
		utim &= ~WD_LASTVAL;
		utim |= wd_last_u;
	} else
		wd_last_u = (utim & WD_INTERVAL);
	if ((utim & WD_INTERVAL) == WD_TO_NEVER) {
		utim = 0;

		/* Assume all is well; watchdog signals failure. */
		error = 0;
	} else {
		/* Assume no watchdog available; watchdog flags success */
		error = EOPNOTSUPP;
	}
	EVENTHANDLER_INVOKE(watchdog_list, utim, &error);
	return (error);
}
示例#5
0
/* HVM mode suspension. */
static void
xctrl_suspend()
{
	int suspend_cancelled;

	EVENTHANDLER_INVOKE(power_suspend);

	/*
	 * Be sure to hold Giant across DEVICE_SUSPEND/RESUME since non-MPSAFE
	 * drivers need this.
	 */
	mtx_lock(&Giant);
	if (DEVICE_SUSPEND(root_bus) != 0) {
		mtx_unlock(&Giant);
		printf("%s: device_suspend failed\n", __func__);
		return;
	}
	mtx_unlock(&Giant);

	/*
	 * Prevent any races with evtchn_interrupt() handler.
	 */
	disable_intr();
	irq_suspend();

	suspend_cancelled = HYPERVISOR_suspend(0);
	if (suspend_cancelled)
		irq_resume();
	else
		xenpci_resume();

	/*
	 * Re-enable interrupts and put the scheduler back to normal.
	 */
	enable_intr();

	/*
	 * FreeBSD really needs to add DEVICE_SUSPEND_CANCEL or
	 * similar.
	 */
	mtx_lock(&Giant);
	if (!suspend_cancelled)
		DEVICE_RESUME(root_bus);
	mtx_unlock(&Giant);

	EVENTHANDLER_INVOKE(power_resume);
}
示例#6
0
void
tcp_offload_listen_start(struct tcpcb *tp)
{

	INP_WLOCK_ASSERT(tp->t_inpcb);

	EVENTHANDLER_INVOKE(tcp_offload_listen_start, tp);
}
示例#7
0
void
__tesla_event_function_prologue_syscallret(void **tesla_data,
    struct thread *td, int error, struct syscall_args *sa)
{

	EVENTHANDLER_INVOKE(tesla_event_function_prologue_syscallret,
	    tesla_data, td, error, sa);
}
示例#8
0
static void
if_low_power_nwk_ev_callback(void *arg)
{
	struct if_low_power_ev_args *if_low_power_ev_args =
	    (struct if_low_power_ev_args *)arg;
	
	EVENTHANDLER_INVOKE(&if_low_power_evhdlr_ctx,
	    if_low_power_event,
	    if_low_power_ev_args->ifp,
	    if_low_power_ev_args->event_code);
}
/*
 * Prepare a proc for use.
 */
static int
proc_ctor(void *mem, int size, void *arg, int flags)
{
	struct proc *p;

	p = (struct proc *)mem;
	SDT_PROBE(proc, kernel, ctor , entry, p, size, arg, flags, 0);
	EVENTHANDLER_INVOKE(process_ctor, p);
	SDT_PROBE(proc, kernel, ctor , return, p, size, arg, flags, 0);
	return (0);
}
示例#10
0
static void
acpi_lid_notify_status_changed(void *arg)
{
    struct acpi_lid_softc	*sc;
    struct acpi_softc		*acpi_sc;
    ACPI_STATUS			status;

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);

    sc = (struct acpi_lid_softc *)arg;
    ACPI_SERIAL_BEGIN(lid);

    /*
     * Evaluate _LID and check the return value, update lid status.
     *	Zero:		The lid is closed
     *	Non-zero:	The lid is open
     */
    status = acpi_GetInteger(sc->lid_handle, "_LID", &sc->lid_status);
    if (ACPI_FAILURE(status))
        goto out;

    acpi_sc = acpi_device_get_parent_softc(sc->lid_dev);
    if (acpi_sc == NULL)
        goto out;

    ACPI_VPRINT(sc->lid_dev, acpi_sc, "Lid %s\n",
                sc->lid_status ? "opened" : "closed");

    acpi_UserNotify("Lid", sc->lid_handle, sc->lid_status);

    if (sc->lid_status == 0)
        EVENTHANDLER_INVOKE(acpi_sleep_event, acpi_sc->acpi_lid_switch_sx);
    else
        EVENTHANDLER_INVOKE(acpi_wakeup_event, acpi_sc->acpi_lid_switch_sx);

out:
    ACPI_SERIAL_END(lid);
    return_VOID;
}
示例#11
0
/*
 * Allow userspace to directly trigger the VM drain routine for testing
 * purposes.
 */
static int
debug_vm_lowmem(SYSCTL_HANDLER_ARGS)
{
	int error, i;

	i = 0;
	error = sysctl_handle_int(oidp, &i, 0, req);
	if (error)
		return (error);
	if ((i & ~(VM_LOW_KMEM | VM_LOW_PAGES)) != 0)
		return (EINVAL);
	if (i != 0)
		EVENTHANDLER_INVOKE(vm_lowmem, i);
	return (0);
}
/*
 * UMA should ensure that this function is never called.
 * Freeing a proc structure would violate type stability.
 */
static void
proc_fini(void *mem, int size)
{
#ifdef notnow
	struct proc *p;

	p = (struct proc *)mem;
	EVENTHANDLER_INVOKE(process_fini, p);
	pstats_free(p->p_stats);
	thread_free(FIRST_THREAD_IN_PROC(p));
	mtx_destroy(&p->p_mtx);
	if (p->p_ksi != NULL)
		ksiginfo_free(p->p_ksi);
#else
	panic("proc reclaimed");
#endif
}
示例#13
0
void
power_profile_set_state(int state) 
{
	int		changed;
    
	if (state != power_profile_state) {
		power_profile_state = state;
		changed = 1;
		kprintf("system power profile changed to '%s'\n",
		       (state == POWER_PROFILE_PERFORMANCE) ? "performance" : "economy");
	} else {
		changed = 0;
	}

	if (changed)
		EVENTHANDLER_INVOKE(power_profile_change, 0);
}
示例#14
0
static int
sysctl_nmbufs(SYSCTL_HANDLER_ARGS)
{
	int error, newnmbufs;

	newnmbufs = nmbufs;
	error = sysctl_handle_int(oidp, &newnmbufs, 0, req);
	if (error == 0 && req->newptr && newnmbufs != nmbufs) {
		if (newnmbufs > nmbufs) {
			nmbufs = newnmbufs;
			nmbufs = uma_zone_set_max(zone_mbuf, nmbufs);
			EVENTHANDLER_INVOKE(nmbufs_change);
		} else
			error = EINVAL;
	}
	return (error);
}
示例#15
0
static int
sysctl_nmbclusters(SYSCTL_HANDLER_ARGS)
{
	int error, newnmbclusters;

	newnmbclusters = nmbclusters;
	error = sysctl_handle_int(oidp, &newnmbclusters, 0, req); 
	if (error == 0 && req->newptr) {
		if (newnmbclusters > nmbclusters) {
			nmbclusters = newnmbclusters;
			uma_zone_set_max(zone_clust, nmbclusters);
			EVENTHANDLER_INVOKE(nmbclusters_change);
		} else
			error = EINVAL;
	}
	return (error);
}
/*
 * Initialize type-stable parts of a proc (when newly created).
 */
static int
proc_init(void *mem, int size, int flags)
{
	struct proc *p;

	p = (struct proc *)mem;
	SDT_PROBE(proc, kernel, init, entry, p, size, flags, 0, 0);
	p->p_sched = (struct p_sched *)&p[1];
	bzero(&p->p_mtx, sizeof(struct mtx));
	mtx_init(&p->p_mtx, "process lock", NULL, MTX_DEF | MTX_DUPOK);
	mtx_init(&p->p_slock, "process slock", NULL, MTX_SPIN | MTX_RECURSE);
	cv_init(&p->p_pwait, "ppwait");
	TAILQ_INIT(&p->p_threads);	     /* all threads in proc */
	EVENTHANDLER_INVOKE(process_init, p);
	p->p_stats = pstats_alloc();
	SDT_PROBE(proc, kernel, init, return, p, size, flags, 0, 0);
	return (0);
}
示例#17
0
static int
sysctl_nmbclusters(SYSCTL_HANDLER_ARGS)
{
	int error, newnmbclusters;

	newnmbclusters = nmbclusters;
	error = sysctl_handle_int(oidp, &newnmbclusters, 0, req);
	if (error == 0 && req->newptr && newnmbclusters != nmbclusters) {
		if (newnmbclusters > nmbclusters &&
		    nmbufs >= nmbclusters + nmbjumbop + nmbjumbo9 + nmbjumbo16) {
			nmbclusters = newnmbclusters;
			nmbclusters = uma_zone_set_max(zone_clust, nmbclusters);
#ifndef __rtems__
			EVENTHANDLER_INVOKE(nmbclusters_change);
#endif /* __rtems__ */
		} else
			error = EINVAL;
	}
	return (error);
}
/*
 * Reclaim a proc after use.
 */
static void
proc_dtor(void *mem, int size, void *arg)
{
	struct proc *p;
	struct thread *td;

	/* INVARIANTS checks go here */
	p = (struct proc *)mem;
	td = FIRST_THREAD_IN_PROC(p);
	SDT_PROBE(proc, kernel, dtor, entry, p, size, arg, td, 0);
	if (td != NULL) {
#ifdef INVARIANTS
		KASSERT((p->p_numthreads == 1),
		    ("bad number of threads in exiting process"));
		KASSERT(STAILQ_EMPTY(&p->p_ktr), ("proc_dtor: non-empty p_ktr"));
#endif
		/* Free all OSD associated to this thread. */
		osd_thread_exit(td);
	}
	EVENTHANDLER_INVOKE(process_dtor, p);
	if (p->p_ksi != NULL)
		KASSERT(! KSI_ONQ(p->p_ksi), ("SIGCHLD queue"));
	SDT_PROBE(proc, kernel, dtor, return, p, size, arg, 0, 0);
}
示例#19
0
/*
 *  Go through the rigmarole of shutting down..
 * this used to be in machdep.c but I'll be dammned if I could see
 * anything machine dependant in it.
 */
static void
boot(int howto)
{
	/*
	 * Get rid of any user scheduler baggage and then give
	 * us a high priority.
	 */
	if (curthread->td_release)
		curthread->td_release(curthread);
	lwkt_setpri_self(TDPRI_MAX);

	/* collect extra flags that shutdown_nice might have set */
	howto |= shutdown_howto;

#ifdef SMP
	/*
	 * We really want to shutdown on the BSP.  Subsystems such as ACPI
	 * can't power-down the box otherwise.
	 */
	if (smp_active_mask > 1) {
		kprintf("boot() called on cpu#%d\n", mycpu->gd_cpuid);
	}
	if (panicstr == NULL && mycpu->gd_cpuid != 0) {
		kprintf("Switching to cpu #0 for shutdown\n");
		lwkt_setcpu_self(globaldata_find(0));
	}
#endif
	/*
	 * Do any callouts that should be done BEFORE syncing the filesystems.
	 */
	EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);

	/*
	 * Try to get rid of any remaining FS references.  The calling
	 * process, proc0, and init may still hold references.  The
	 * VFS cache subsystem may still hold a root reference to root.
	 *
	 * XXX this needs work.  We really need to SIGSTOP all remaining
	 * processes in order to avoid blowups due to proc0's filesystem
	 * references going away.  For now just make sure that the init
	 * process is stopped.
	 */
	if (panicstr == NULL) {
		shutdown_cleanup_proc(curproc);
		shutdown_cleanup_proc(&proc0);
		if (initproc) {
			if (initproc != curproc) {
				ksignal(initproc, SIGSTOP);
				tsleep(boot, 0, "shutdn", hz / 20);
			}
			shutdown_cleanup_proc(initproc);
		}
		vfs_cache_setroot(NULL, NULL);
	}

	/* 
	 * Now sync filesystems
	 */
	if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
		int iter, nbusy, pbusy;

		waittime = 0;
		kprintf("\nsyncing disks... ");

		sys_sync(NULL);	/* YYY was sync(&proc0, NULL). why proc0 ? */

		/*
		 * With soft updates, some buffers that are
		 * written will be remarked as dirty until other
		 * buffers are written.
		 */
		for (iter = pbusy = 0; iter < 20; iter++) {
			nbusy = scan_all_buffers(shutdown_busycount1, NULL);
			if (nbusy == 0)
				break;
			kprintf("%d ", nbusy);
			if (nbusy < pbusy)
				iter = 0;
			pbusy = nbusy;
			/*
			 * XXX:
			 * Process soft update work queue if buffers don't sync
			 * after 6 iterations by permitting the syncer to run.
			 */
			if (iter > 5)
				bio_ops_sync(NULL);
 
			sys_sync(NULL); /* YYY was sync(&proc0, NULL). why proc0 ? */
			tsleep(boot, 0, "shutdn", hz * iter / 20 + 1);
		}
		kprintf("\n");
		/*
		 * Count only busy local buffers to prevent forcing 
		 * a fsck if we're just a client of a wedged NFS server
		 */
		nbusy = scan_all_buffers(shutdown_busycount2, NULL);
		if (nbusy) {
			/*
			 * Failed to sync all blocks. Indicate this and don't
			 * unmount filesystems (thus forcing an fsck on reboot).
			 */
			kprintf("giving up on %d buffers\n", nbusy);
#ifdef DDB
			if (debugger_on_panic)
				Debugger("busy buffer problem");
#endif /* DDB */
			tsleep(boot, 0, "shutdn", hz * 5 + 1);
		} else {
			kprintf("done\n");
			/*
			 * Unmount filesystems
			 */
			if (panicstr == NULL)
				vfs_unmountall();
		}
		tsleep(boot, 0, "shutdn", hz / 10 + 1);
	}

	print_uptime();

	/*
	 * Dump before doing post_sync shutdown ops
	 */
	crit_enter();
	if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold) {
		dumpsys();
	}

	/*
	 * Ok, now do things that assume all filesystem activity has
	 * been completed.  This will also call the device shutdown
	 * methods.
	 */
	EVENTHANDLER_INVOKE(shutdown_post_sync, howto);

	/* Now that we're going to really halt the system... */
	EVENTHANDLER_INVOKE(shutdown_final, howto);

	for(;;) ;	/* safety against shutdown_reset not working */
	/* NOTREACHED */
}
示例#20
0
static void
xctrl_suspend()
{
#ifdef SMP
	cpuset_t cpu_suspend_map;
#endif
	int suspend_cancelled;

	EVENTHANDLER_INVOKE(power_suspend);

	if (smp_started) {
		thread_lock(curthread);
		sched_bind(curthread, 0);
		thread_unlock(curthread);
	}
	KASSERT((PCPU_GET(cpuid) == 0), ("Not running on CPU#0"));

	/*
	 * Clear our XenStore node so the toolstack knows we are
	 * responding to the suspend request.
	 */
	xs_write(XST_NIL, "control", "shutdown", "");

	/*
	 * Be sure to hold Giant across DEVICE_SUSPEND/RESUME since non-MPSAFE
	 * drivers need this.
	 */
	mtx_lock(&Giant);
	if (DEVICE_SUSPEND(root_bus) != 0) {
		mtx_unlock(&Giant);
		printf("%s: device_suspend failed\n", __func__);
		return;
	}
	mtx_unlock(&Giant);

#ifdef SMP
	CPU_ZERO(&cpu_suspend_map);	/* silence gcc */
	if (smp_started) {
		/*
		 * Suspend other CPUs. This prevents IPIs while we
		 * are resuming, and will allow us to reset per-cpu
		 * vcpu_info on resume.
		 */
		cpu_suspend_map = all_cpus;
		CPU_CLR(PCPU_GET(cpuid), &cpu_suspend_map);
		if (!CPU_EMPTY(&cpu_suspend_map))
			suspend_cpus(cpu_suspend_map);
	}
#endif

	/*
	 * Prevent any races with evtchn_interrupt() handler.
	 */
	disable_intr();
	intr_suspend();
	xen_hvm_suspend();

	suspend_cancelled = HYPERVISOR_suspend(0);

	xen_hvm_resume(suspend_cancelled != 0);
	intr_resume(suspend_cancelled != 0);
	enable_intr();

	/*
	 * Reset grant table info.
	 */
	gnttab_resume(NULL);

#ifdef SMP
	/* Send an IPI_BITMAP in case there are pending bitmap IPIs. */
	lapic_ipi_vectored(IPI_BITMAP_VECTOR, APIC_IPI_DEST_ALL);
	if (smp_started && !CPU_EMPTY(&cpu_suspend_map)) {
		/*
		 * Now that event channels have been initialized,
		 * resume CPUs.
		 */
		resume_cpus(cpu_suspend_map);
	}
#endif

	/*
	 * FreeBSD really needs to add DEVICE_SUSPEND_CANCEL or
	 * similar.
	 */
	mtx_lock(&Giant);
	DEVICE_RESUME(root_bus);
	mtx_unlock(&Giant);

	if (smp_started) {
		thread_lock(curthread);
		sched_unbind(curthread);
		thread_unlock(curthread);
	}

	EVENTHANDLER_INVOKE(power_resume);

	if (bootverbose)
		printf("System resumed after suspension\n");

}
示例#21
0
/*
 * Exit: deallocate address space and other resources, change proc state to
 * zombie, and unlink proc from allproc and parent's lists.  Save exit status
 * and rusage for wait().  Check for child processes and orphan them.
 */
void
exit1(struct thread *td, int rv)
{
	struct proc *p, *nq, *q;
	struct vnode *vtmp;
	struct vnode *ttyvp = NULL;
	struct plimit *plim;

	mtx_assert(&Giant, MA_NOTOWNED);

	p = td->td_proc;
	/*
	 * XXX in case we're rebooting we just let init die in order to
	 * work around an unsolved stack overflow seen very late during
	 * shutdown on sparc64 when the gmirror worker process exists.
	 */
	if (p == initproc && rebooting == 0) {
		printf("init died (signal %d, exit %d)\n",
		    WTERMSIG(rv), WEXITSTATUS(rv));
		panic("Going nowhere without my init!");
	}

	/*
	 * MUST abort all other threads before proceeding past here.
	 */
	PROC_LOCK(p);
	while (p->p_flag & P_HADTHREADS) {
		/*
		 * First check if some other thread got here before us.
		 * If so, act appropriately: exit or suspend.
		 */
		thread_suspend_check(0);

		/*
		 * Kill off the other threads. This requires
		 * some co-operation from other parts of the kernel
		 * so it may not be instantaneous.  With this state set
		 * any thread entering the kernel from userspace will
		 * thread_exit() in trap().  Any thread attempting to
		 * sleep will return immediately with EINTR or EWOULDBLOCK
		 * which will hopefully force them to back out to userland
		 * freeing resources as they go.  Any thread attempting
		 * to return to userland will thread_exit() from userret().
		 * thread_exit() will unsuspend us when the last of the
		 * other threads exits.
		 * If there is already a thread singler after resumption,
		 * calling thread_single will fail; in that case, we just
		 * re-check all suspension request, the thread should
		 * either be suspended there or exit.
		 */
		if (!thread_single(SINGLE_EXIT))
			break;

		/*
		 * All other activity in this process is now stopped.
		 * Threading support has been turned off.
		 */
	}
	KASSERT(p->p_numthreads == 1,
	    ("exit1: proc %p exiting with %d threads", p, p->p_numthreads));
	racct_sub(p, RACCT_NTHR, 1);
	/*
	 * Wakeup anyone in procfs' PIOCWAIT.  They should have a hold
	 * on our vmspace, so we should block below until they have
	 * released their reference to us.  Note that if they have
	 * requested S_EXIT stops we will block here until they ack
	 * via PIOCCONT.
	 */
	_STOPEVENT(p, S_EXIT, rv);

	/*
	 * Ignore any pending request to stop due to a stop signal.
	 * Once P_WEXIT is set, future requests will be ignored as
	 * well.
	 */
	p->p_flag &= ~P_STOPPED_SIG;
	KASSERT(!P_SHOULDSTOP(p), ("exiting process is stopped"));

	/*
	 * Note that we are exiting and do another wakeup of anyone in
	 * PIOCWAIT in case they aren't listening for S_EXIT stops or
	 * decided to wait again after we told them we are exiting.
	 */
	p->p_flag |= P_WEXIT;
	wakeup(&p->p_stype);

	/*
	 * Wait for any processes that have a hold on our vmspace to
	 * release their reference.
	 */
	while (p->p_lock > 0)
		msleep(&p->p_lock, &p->p_mtx, PWAIT, "exithold", 0);

	p->p_xstat = rv;	/* Let event handler change exit status */
	PROC_UNLOCK(p);
	/* Drain the limit callout while we don't have the proc locked */
	callout_drain(&p->p_limco);

#ifdef AUDIT
	/*
	 * The Sun BSM exit token contains two components: an exit status as
	 * passed to exit(), and a return value to indicate what sort of exit
	 * it was.  The exit status is WEXITSTATUS(rv), but it's not clear
	 * what the return value is.
	 */
	AUDIT_ARG_EXIT(WEXITSTATUS(rv), 0);
	AUDIT_SYSCALL_EXIT(0, td);
#endif

	/* Are we a task leader? */
	if (p == p->p_leader) {
		mtx_lock(&ppeers_lock);
		q = p->p_peers;
		while (q != NULL) {
			PROC_LOCK(q);
			kern_psignal(q, SIGKILL);
			PROC_UNLOCK(q);
			q = q->p_peers;
		}
		while (p->p_peers != NULL)
			msleep(p, &ppeers_lock, PWAIT, "exit1", 0);
		mtx_unlock(&ppeers_lock);
	}

	/*
	 * Check if any loadable modules need anything done at process exit.
	 * E.g. SYSV IPC stuff
	 * XXX what if one of these generates an error?
	 */
	EVENTHANDLER_INVOKE(process_exit, p);

	/*
	 * If parent is waiting for us to exit or exec,
	 * P_PPWAIT is set; we will wakeup the parent below.
	 */
	PROC_LOCK(p);
	rv = p->p_xstat;	/* Event handler could change exit status */
	stopprofclock(p);
	p->p_flag &= ~(P_TRACED | P_PPWAIT | P_PPTRACE);

	/*
	 * Stop the real interval timer.  If the handler is currently
	 * executing, prevent it from rearming itself and let it finish.
	 */
	if (timevalisset(&p->p_realtimer.it_value) &&
	    callout_stop(&p->p_itcallout) == 0) {
		timevalclear(&p->p_realtimer.it_interval);
		msleep(&p->p_itcallout, &p->p_mtx, PWAIT, "ritwait", 0);
		KASSERT(!timevalisset(&p->p_realtimer.it_value),
		    ("realtime timer is still armed"));
	}
	PROC_UNLOCK(p);

	/*
	 * Reset any sigio structures pointing to us as a result of
	 * F_SETOWN with our pid.
	 */
	funsetownlst(&p->p_sigiolst);

	/*
	 * If this process has an nlminfo data area (for lockd), release it
	 */
	if (nlminfo_release_p != NULL && p->p_nlminfo != NULL)
		(*nlminfo_release_p)(p);

	/*
	 * Close open files and release open-file table.
	 * This may block!
	 */
	fdescfree(td);

	/*
	 * If this thread tickled GEOM, we need to wait for the giggling to
	 * stop before we return to userland
	 */
	if (td->td_pflags & TDP_GEOM)
		g_waitidle();

	/*
	 * Remove ourself from our leader's peer list and wake our leader.
	 */
	mtx_lock(&ppeers_lock);
	if (p->p_leader->p_peers) {
		q = p->p_leader;
		while (q->p_peers != p)
			q = q->p_peers;
		q->p_peers = p->p_peers;
		wakeup(p->p_leader);
	}
	mtx_unlock(&ppeers_lock);

	vmspace_exit(td);

	sx_xlock(&proctree_lock);
	if (SESS_LEADER(p)) {
		struct session *sp = p->p_session;
		struct tty *tp;

		/*
		 * s_ttyp is not zero'd; we use this to indicate that
		 * the session once had a controlling terminal. (for
		 * logging and informational purposes)
		 */
		SESS_LOCK(sp);
		ttyvp = sp->s_ttyvp;
		tp = sp->s_ttyp;
		sp->s_ttyvp = NULL;
		sp->s_ttydp = NULL;
		sp->s_leader = NULL;
		SESS_UNLOCK(sp);

		/*
		 * Signal foreground pgrp and revoke access to
		 * controlling terminal if it has not been revoked
		 * already.
		 *
		 * Because the TTY may have been revoked in the mean
		 * time and could already have a new session associated
		 * with it, make sure we don't send a SIGHUP to a
		 * foreground process group that does not belong to this
		 * session.
		 */

		if (tp != NULL) {
			tty_lock(tp);
			if (tp->t_session == sp)
				tty_signal_pgrp(tp, SIGHUP);
			tty_unlock(tp);
		}

		if (ttyvp != NULL) {
			sx_xunlock(&proctree_lock);
			if (vn_lock(ttyvp, LK_EXCLUSIVE) == 0) {
				VOP_REVOKE(ttyvp, REVOKEALL);
				VOP_UNLOCK(ttyvp, 0);
			}
			sx_xlock(&proctree_lock);
		}
	}
	fixjobc(p, p->p_pgrp, 0);
	sx_xunlock(&proctree_lock);
	(void)acct_process(td);

	/* Release the TTY now we've unlocked everything. */
	if (ttyvp != NULL)
		vrele(ttyvp);
#ifdef KTRACE
	ktrprocexit(td);
#endif
	/*
	 * Release reference to text vnode
	 */
	if ((vtmp = p->p_textvp) != NULL) {
		p->p_textvp = NULL;
		vrele(vtmp);
	}

	/*
	 * Release our limits structure.
	 */
	plim = p->p_limit;
	p->p_limit = NULL;
	lim_free(plim);

	tidhash_remove(td);

	/*
	 * Remove proc from allproc queue and pidhash chain.
	 * Place onto zombproc.  Unlink from parent's child list.
	 */
	sx_xlock(&allproc_lock);
	LIST_REMOVE(p, p_list);
	LIST_INSERT_HEAD(&zombproc, p, p_list);
	LIST_REMOVE(p, p_hash);
	sx_xunlock(&allproc_lock);

	/*
	 * Call machine-dependent code to release any
	 * machine-dependent resources other than the address space.
	 * The address space is released by "vmspace_exitfree(p)" in
	 * vm_waitproc().
	 */
	cpu_exit(td);

	WITNESS_WARN(WARN_PANIC, NULL, "process (pid %d) exiting", p->p_pid);

	/*
	 * Reparent all of our children to init.
	 */
	sx_xlock(&proctree_lock);
	q = LIST_FIRST(&p->p_children);
	if (q != NULL)		/* only need this if any child is S_ZOMB */
		wakeup(initproc);
	for (; q != NULL; q = nq) {
		nq = LIST_NEXT(q, p_sibling);
		PROC_LOCK(q);
		proc_reparent(q, initproc);
		q->p_sigparent = SIGCHLD;
		/*
		 * Traced processes are killed
		 * since their existence means someone is screwing up.
		 */
		if (q->p_flag & P_TRACED) {
			struct thread *temp;

			/*
			 * Since q was found on our children list, the
			 * proc_reparent() call moved q to the orphan
			 * list due to present P_TRACED flag. Clear
			 * orphan link for q now while q is locked.
			 */
			clear_orphan(q);
			q->p_flag &= ~(P_TRACED | P_STOPPED_TRACE);
			FOREACH_THREAD_IN_PROC(q, temp)
				temp->td_dbgflags &= ~TDB_SUSPEND;
			kern_psignal(q, SIGKILL);
		}
		PROC_UNLOCK(q);
	}

	/*
	 * Also get rid of our orphans.
	 */
	while ((q = LIST_FIRST(&p->p_orphans)) != NULL) {
		PROC_LOCK(q);
		clear_orphan(q);
		PROC_UNLOCK(q);
	}

	/* Save exit status. */
	PROC_LOCK(p);
	p->p_xthread = td;

	/* Tell the prison that we are gone. */
	prison_proc_free(p->p_ucred->cr_prison);

#ifdef KDTRACE_HOOKS
	/*
	 * Tell the DTrace fasttrap provider about the exit if it
	 * has declared an interest.
	 */
	if (dtrace_fasttrap_exit)
		dtrace_fasttrap_exit(p);
#endif

	/*
	 * Notify interested parties of our demise.
	 */
	KNOTE_LOCKED(&p->p_klist, NOTE_EXIT);

#ifdef KDTRACE_HOOKS
	int reason = CLD_EXITED;
	if (WCOREDUMP(rv))
		reason = CLD_DUMPED;
	else if (WIFSIGNALED(rv))
		reason = CLD_KILLED;
	SDT_PROBE(proc, kernel, , exit, reason, 0, 0, 0, 0);
#endif

	/*
	 * Just delete all entries in the p_klist. At this point we won't
	 * report any more events, and there are nasty race conditions that
	 * can beat us if we don't.
	 */
	knlist_clear(&p->p_klist, 1);

	/*
	 * If this is a process with a descriptor, we may not need to deliver
	 * a signal to the parent.  proctree_lock is held over
	 * procdesc_exit() to serialize concurrent calls to close() and
	 * exit().
	 */
	if (p->p_procdesc == NULL || procdesc_exit(p)) {
		/*
		 * Notify parent that we're gone.  If parent has the
		 * PS_NOCLDWAIT flag set, or if the handler is set to SIG_IGN,
		 * notify process 1 instead (and hope it will handle this
		 * situation).
		 */
		PROC_LOCK(p->p_pptr);
		mtx_lock(&p->p_pptr->p_sigacts->ps_mtx);
		if (p->p_pptr->p_sigacts->ps_flag &
		    (PS_NOCLDWAIT | PS_CLDSIGIGN)) {
			struct proc *pp;

			mtx_unlock(&p->p_pptr->p_sigacts->ps_mtx);
			pp = p->p_pptr;
			PROC_UNLOCK(pp);
			proc_reparent(p, initproc);
			p->p_sigparent = SIGCHLD;
			PROC_LOCK(p->p_pptr);

			/*
			 * Notify parent, so in case he was wait(2)ing or
			 * executing waitpid(2) with our pid, he will
			 * continue.
			 */
			wakeup(pp);
		} else
			mtx_unlock(&p->p_pptr->p_sigacts->ps_mtx);

		if (p->p_pptr == initproc)
			kern_psignal(p->p_pptr, SIGCHLD);
		else if (p->p_sigparent != 0) {
			if (p->p_sigparent == SIGCHLD)
				childproc_exited(p);
			else	/* LINUX thread */
				kern_psignal(p->p_pptr, p->p_sigparent);
		}
	} else
		PROC_LOCK(p->p_pptr);
	sx_xunlock(&proctree_lock);

	/*
	 * The state PRS_ZOMBIE prevents other proesses from sending
	 * signal to the process, to avoid memory leak, we free memory
	 * for signal queue at the time when the state is set.
	 */
	sigqueue_flush(&p->p_sigqueue);
	sigqueue_flush(&td->td_sigqueue);

	/*
	 * We have to wait until after acquiring all locks before
	 * changing p_state.  We need to avoid all possible context
	 * switches (including ones from blocking on a mutex) while
	 * marked as a zombie.  We also have to set the zombie state
	 * before we release the parent process' proc lock to avoid
	 * a lost wakeup.  So, we first call wakeup, then we grab the
	 * sched lock, update the state, and release the parent process'
	 * proc lock.
	 */
	wakeup(p->p_pptr);
	cv_broadcast(&p->p_pwait);
	sched_exit(p->p_pptr, td);
	PROC_SLOCK(p);
	p->p_state = PRS_ZOMBIE;
	PROC_UNLOCK(p->p_pptr);

	/*
	 * Hopefully no one will try to deliver a signal to the process this
	 * late in the game.
	 */
	knlist_destroy(&p->p_klist);

	/*
	 * Save our children's rusage information in our exit rusage.
	 */
	ruadd(&p->p_ru, &p->p_rux, &p->p_stats->p_cru, &p->p_crux);

	/*
	 * Make sure the scheduler takes this thread out of its tables etc.
	 * This will also release this thread's reference to the ucred.
	 * Other thread parts to release include pcb bits and such.
	 */
	thread_exit();
}
示例#22
0
void
vfs_mountroot(void)
{
	struct mount *mp;
	struct sbuf *sb;
	struct thread *td;
	time_t timebase;
	int error;

	td = curthread;

	vfs_mountroot_wait();

	sb = sbuf_new_auto();
	vfs_mountroot_conf0(sb);
	sbuf_finish(sb);

	error = vfs_mountroot_devfs(td, &mp);
	while (!error) {
		error = vfs_mountroot_parse(sb, mp);
		if (!error) {
			error = vfs_mountroot_shuffle(td, mp);
			if (!error) {
				sbuf_clear(sb);
				error = vfs_mountroot_readconf(td, sb);
				sbuf_finish(sb);
			}
		}
	}

	sbuf_delete(sb);

	/*
	 * Iterate over all currently mounted file systems and use
	 * the time stamp found to check and/or initialize the RTC.
	 * Call inittodr() only once and pass it the largest of the
	 * timestamps we encounter.
	 */
	timebase = 0;
	mtx_lock(&mountlist_mtx);
	mp = TAILQ_FIRST(&mountlist);
	while (mp != NULL) {
		if (mp->mnt_time > timebase)
			timebase = mp->mnt_time;
		mp = TAILQ_NEXT(mp, mnt_list);
	}
	mtx_unlock(&mountlist_mtx);
	inittodr(timebase);

	/* Keep prison0's root in sync with the global rootvnode. */
	mtx_lock(&prison0.pr_mtx);
	prison0.pr_root = rootvnode;
	vref(prison0.pr_root);
	mtx_unlock(&prison0.pr_mtx);

	mtx_lock(&mountlist_mtx);
	atomic_store_rel_int(&root_mount_complete, 1);
	wakeup(&root_mount_complete);
	mtx_unlock(&mountlist_mtx);

	EVENTHANDLER_INVOKE(mountroot);
}
示例#23
0
/*
 * Shutdown the system cleanly to prepare for reboot, halt, or power off.
 */
void
kern_reboot(int howto)
{
	static int first_buf_printf = 1;

#if defined(SMP)
	/*
	 * Bind us to CPU 0 so that all shutdown code runs there.  Some
	 * systems don't shutdown properly (i.e., ACPI power off) if we
	 * run on another processor.
	 */
	if (!SCHEDULER_STOPPED()) {
		thread_lock(curthread);
		sched_bind(curthread, 0);
		thread_unlock(curthread);
		KASSERT(PCPU_GET(cpuid) == 0, ("boot: not running on cpu 0"));
	}
#endif
	/* We're in the process of rebooting. */
	rebooting = 1;

	/* collect extra flags that shutdown_nice might have set */
	howto |= shutdown_howto;

	/* We are out of the debugger now. */
	kdb_active = 0;

	/*
	 * Do any callouts that should be done BEFORE syncing the filesystems.
	 */
	EVENTHANDLER_INVOKE(shutdown_pre_sync, howto);

	/* 
	 * Now sync filesystems
	 */
	if (!cold && (howto & RB_NOSYNC) == 0 && waittime < 0) {
		register struct buf *bp;
		int iter, nbusy, pbusy;
#ifndef PREEMPTION
		int subiter;
#endif

		waittime = 0;

		wdog_kern_pat(WD_LASTVAL);
		sys_sync(curthread, NULL);

		/*
		 * With soft updates, some buffers that are
		 * written will be remarked as dirty until other
		 * buffers are written.
		 */
		for (iter = pbusy = 0; iter < 20; iter++) {
			nbusy = 0;
			for (bp = &buf[nbuf]; --bp >= buf; )
				if (isbufbusy(bp))
					nbusy++;
			if (nbusy == 0) {
				if (first_buf_printf)
					printf("All buffers synced.");
				break;
			}
			if (first_buf_printf) {
				printf("Syncing disks, buffers remaining... ");
				first_buf_printf = 0;
			}
			printf("%d ", nbusy);
			if (nbusy < pbusy)
				iter = 0;
			pbusy = nbusy;

			wdog_kern_pat(WD_LASTVAL);
			sys_sync(curthread, NULL);

#ifdef PREEMPTION
			/*
			 * Drop Giant and spin for a while to allow
			 * interrupt threads to run.
			 */
			DROP_GIANT();
			DELAY(50000 * iter);
			PICKUP_GIANT();
#else
			/*
			 * Drop Giant and context switch several times to
			 * allow interrupt threads to run.
			 */
			DROP_GIANT();
			for (subiter = 0; subiter < 50 * iter; subiter++) {
				thread_lock(curthread);
				mi_switch(SW_VOL, NULL);
				thread_unlock(curthread);
				DELAY(1000);
			}
			PICKUP_GIANT();
#endif
		}
		printf("\n");
		/*
		 * Count only busy local buffers to prevent forcing 
		 * a fsck if we're just a client of a wedged NFS server
		 */
		nbusy = 0;
		for (bp = &buf[nbuf]; --bp >= buf; ) {
			if (isbufbusy(bp)) {
#if 0
/* XXX: This is bogus.  We should probably have a BO_REMOTE flag instead */
				if (bp->b_dev == NULL) {
					TAILQ_REMOVE(&mountlist,
					    bp->b_vp->v_mount, mnt_list);
					continue;
				}
#endif
				nbusy++;
				if (show_busybufs > 0) {
					printf(
	    "%d: buf:%p, vnode:%p, flags:%0x, blkno:%jd, lblkno:%jd, buflock:",
					    nbusy, bp, bp->b_vp, bp->b_flags,
					    (intmax_t)bp->b_blkno,
					    (intmax_t)bp->b_lblkno);
					BUF_LOCKPRINTINFO(bp);
					if (show_busybufs > 1)
						vn_printf(bp->b_vp,
						    "vnode content: ");
				}
			}
		}
		if (nbusy) {
			/*
			 * Failed to sync all blocks. Indicate this and don't
			 * unmount filesystems (thus forcing an fsck on reboot).
			 */
			printf("Giving up on %d buffers\n", nbusy);
			DELAY(5000000);	/* 5 seconds */
		} else {
			if (!first_buf_printf)
				printf("Final sync complete\n");
			/*
			 * Unmount filesystems
			 */
			if (panicstr == 0)
				vfs_unmountall();
		}
		swapoff_all();
		DELAY(100000);		/* wait for console output to finish */
	}

	print_uptime();

	cngrab();

	/*
	 * Ok, now do things that assume all filesystem activity has
	 * been completed.
	 */
	EVENTHANDLER_INVOKE(shutdown_post_sync, howto);

	if ((howto & (RB_HALT|RB_DUMP)) == RB_DUMP && !cold && !dumping) 
		doadump(TRUE);

	/* Now that we're going to really halt the system... */
	EVENTHANDLER_INVOKE(shutdown_final, howto);

	for(;;) ;	/* safety against shutdown_reset not working */
	/* NOTREACHED */
}
示例#24
0
文件: control.c 项目: coyizumi/cs111
/* Full PV mode suspension. */
static void
xctrl_suspend()
{
	int i, j, k, fpp, suspend_cancelled;
	unsigned long max_pfn, start_info_mfn;

	EVENTHANDLER_INVOKE(power_suspend);

#ifdef SMP
	struct thread *td;
	cpuset_t map;
	u_int cpuid;

	/*
	 * Bind us to CPU 0 and stop any other VCPUs.
	 */
	td = curthread;
	thread_lock(td);
	sched_bind(td, 0);
	thread_unlock(td);
	cpuid = PCPU_GET(cpuid);
	KASSERT(cpuid == 0, ("xen_suspend: not running on cpu 0"));

	map = all_cpus;
	CPU_CLR(cpuid, &map);
	CPU_NAND(&map, &stopped_cpus);
	if (!CPU_EMPTY(&map))
		stop_cpus(map);
#endif

	/*
	 * Be sure to hold Giant across DEVICE_SUSPEND/RESUME since non-MPSAFE
	 * drivers need this.
	 */
	mtx_lock(&Giant);
	if (DEVICE_SUSPEND(root_bus) != 0) {
		mtx_unlock(&Giant);
		printf("%s: device_suspend failed\n", __func__);
#ifdef SMP
		if (!CPU_EMPTY(&map))
			restart_cpus(map);
#endif
		return;
	}
	mtx_unlock(&Giant);

	local_irq_disable();

	xencons_suspend();
	gnttab_suspend();
	intr_suspend();

	max_pfn = HYPERVISOR_shared_info->arch.max_pfn;

	void *shared_info = HYPERVISOR_shared_info;
	HYPERVISOR_shared_info = NULL;
	pmap_kremove((vm_offset_t) shared_info);
	PT_UPDATES_FLUSH();

	xen_start_info->store_mfn = MFNTOPFN(xen_start_info->store_mfn);
	xen_start_info->console.domU.mfn = MFNTOPFN(xen_start_info->console.domU.mfn);

	/*
	 * We'll stop somewhere inside this hypercall. When it returns,
	 * we'll start resuming after the restore.
	 */
	start_info_mfn = VTOMFN(xen_start_info);
	pmap_suspend();
	suspend_cancelled = HYPERVISOR_suspend(start_info_mfn);
	pmap_resume();

	pmap_kenter_ma((vm_offset_t) shared_info, xen_start_info->shared_info);
	HYPERVISOR_shared_info = shared_info;

	HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list =
		VTOMFN(xen_pfn_to_mfn_frame_list_list);
  
	fpp = PAGE_SIZE/sizeof(unsigned long);
	for (i = 0, j = 0, k = -1; i < max_pfn; i += fpp, j++) {
		if ((j % fpp) == 0) {
			k++;
			xen_pfn_to_mfn_frame_list_list[k] = 
				VTOMFN(xen_pfn_to_mfn_frame_list[k]);
			j = 0;
		}
		xen_pfn_to_mfn_frame_list[k][j] = 
			VTOMFN(&xen_phys_machine[i]);
	}
	HYPERVISOR_shared_info->arch.max_pfn = max_pfn;

	gnttab_resume();
	intr_resume(suspend_cancelled != 0);
	local_irq_enable();
	xencons_resume();

#ifdef CONFIG_SMP
	for_each_cpu(i)
		vcpu_prepare(i);

#endif

	/* 
	 * Only resume xenbus /after/ we've prepared our VCPUs; otherwise
	 * the VCPU hotplug callback can race with our vcpu_prepare
	 */
	mtx_lock(&Giant);
	DEVICE_RESUME(root_bus);
	mtx_unlock(&Giant);

#ifdef SMP
	thread_lock(curthread);
	sched_unbind(curthread);
	thread_unlock(curthread);
	if (!CPU_EMPTY(&map))
		restart_cpus(map);
#endif
	EVENTHANDLER_INVOKE(power_resume);
}
示例#25
0
int
wdog_kern_pat(u_int utim)
{
	int error;

	if ((utim & WD_LASTVAL) != 0 && (utim & WD_INTERVAL) > 0)
		return (EINVAL);

	if ((utim & WD_LASTVAL) != 0) {
		/*
		 * if WD_LASTVAL is set, fill in the bits for timeout
		 * from the saved value in wd_last_u.
		 */
		MPASS((wd_last_u & ~WD_INTERVAL) == 0);
		utim &= ~WD_LASTVAL;
		utim |= wd_last_u;
	} else {
		/*
		 * Otherwise save the new interval.
		 * This can be zero (to disable the watchdog)
		 */
		wd_last_u = (utim & WD_INTERVAL);
		wd_last_u_sysctl = wd_last_u;
		wd_last_u_sysctl_secs = pow2ns_to_ticks(wd_last_u) / hz;
	}
	if ((utim & WD_INTERVAL) == WD_TO_NEVER) {
		utim = 0;

		/* Assume all is well; watchdog signals failure. */
		error = 0;
	} else {
		/* Assume no watchdog available; watchdog flags success */
		error = EOPNOTSUPP;
	}
	if (wd_softtimer) {
		if (utim == 0) {
			callout_stop(&wd_softtimeo_handle);
		} else {
			(void) callout_reset(&wd_softtimeo_handle,
			    pow2ns_to_ticks(utim), wd_timeout_cb, "soft");
		}
		error = 0;
	} else {
		EVENTHANDLER_INVOKE(watchdog_list, utim, &error);
	}
	wd_set_pretimeout(wd_pretimeout, true);
	/*
	 * If we were able to arm/strobe the watchdog, then
	 * update the last time it was strobed for WDIOC_GETTIMELEFT
	 */
	if (!error) {
		struct timespec ts;

		error = kern_clock_gettime(curthread /* XXX */,
		    CLOCK_MONOTONIC_FAST, &ts);
		if (!error) {
			wd_lastpat = ts.tv_sec;
			wd_lastpat_valid = 1;
		}
	}
	return (error);
}
示例#26
0
static void
do_fork(struct thread *td, struct fork_req *fr, struct proc *p2, struct thread *td2,
    struct vmspace *vm2, struct file *fp_procdesc)
{
	struct proc *p1, *pptr;
	int trypid;
	struct filedesc *fd;
	struct filedesc_to_leader *fdtol;
	struct sigacts *newsigacts;

	sx_assert(&proctree_lock, SX_SLOCKED);
	sx_assert(&allproc_lock, SX_XLOCKED);

	p1 = td->td_proc;

	trypid = fork_findpid(fr->fr_flags);

	sx_sunlock(&proctree_lock);

	p2->p_state = PRS_NEW;		/* protect against others */
	p2->p_pid = trypid;
	AUDIT_ARG_PID(p2->p_pid);
	LIST_INSERT_HEAD(&allproc, p2, p_list);
	allproc_gen++;
	LIST_INSERT_HEAD(PIDHASH(p2->p_pid), p2, p_hash);
	tidhash_add(td2);
	PROC_LOCK(p2);
	PROC_LOCK(p1);

	sx_xunlock(&allproc_lock);

	bcopy(&p1->p_startcopy, &p2->p_startcopy,
	    __rangeof(struct proc, p_startcopy, p_endcopy));
	pargs_hold(p2->p_args);

	PROC_UNLOCK(p1);

	bzero(&p2->p_startzero,
	    __rangeof(struct proc, p_startzero, p_endzero));

	/* Tell the prison that we exist. */
	prison_proc_hold(p2->p_ucred->cr_prison);

	PROC_UNLOCK(p2);

	/*
	 * Malloc things while we don't hold any locks.
	 */
	if (fr->fr_flags & RFSIGSHARE)
		newsigacts = NULL;
	else
		newsigacts = sigacts_alloc();

	/*
	 * Copy filedesc.
	 */
	if (fr->fr_flags & RFCFDG) {
		fd = fdinit(p1->p_fd, false);
		fdtol = NULL;
	} else if (fr->fr_flags & RFFDG) {
		fd = fdcopy(p1->p_fd);
		fdtol = NULL;
	} else {
		fd = fdshare(p1->p_fd);
		if (p1->p_fdtol == NULL)
			p1->p_fdtol = filedesc_to_leader_alloc(NULL, NULL,
			    p1->p_leader);
		if ((fr->fr_flags & RFTHREAD) != 0) {
			/*
			 * Shared file descriptor table, and shared
			 * process leaders.
			 */
			fdtol = p1->p_fdtol;
			FILEDESC_XLOCK(p1->p_fd);
			fdtol->fdl_refcount++;
			FILEDESC_XUNLOCK(p1->p_fd);
		} else {
			/* 
			 * Shared file descriptor table, and different
			 * process leaders.
			 */
			fdtol = filedesc_to_leader_alloc(p1->p_fdtol,
			    p1->p_fd, p2);
		}
	}
	/*
	 * Make a proc table entry for the new process.
	 * Start by zeroing the section of proc that is zero-initialized,
	 * then copy the section that is copied directly from the parent.
	 */

	PROC_LOCK(p2);
	PROC_LOCK(p1);

	bzero(&td2->td_startzero,
	    __rangeof(struct thread, td_startzero, td_endzero));

	bcopy(&td->td_startcopy, &td2->td_startcopy,
	    __rangeof(struct thread, td_startcopy, td_endcopy));

	bcopy(&p2->p_comm, &td2->td_name, sizeof(td2->td_name));
	td2->td_sigstk = td->td_sigstk;
	td2->td_flags = TDF_INMEM;
	td2->td_lend_user_pri = PRI_MAX;

#ifdef VIMAGE
	td2->td_vnet = NULL;
	td2->td_vnet_lpush = NULL;
#endif

	/*
	 * Allow the scheduler to initialize the child.
	 */
	thread_lock(td);
	sched_fork(td, td2);
	thread_unlock(td);

	/*
	 * Duplicate sub-structures as needed.
	 * Increase reference counts on shared objects.
	 */
	p2->p_flag = P_INMEM;
	p2->p_flag2 = p1->p_flag2 & (P2_NOTRACE | P2_NOTRACE_EXEC | P2_TRAPCAP);
	p2->p_swtick = ticks;
	if (p1->p_flag & P_PROFIL)
		startprofclock(p2);

	/*
	 * Whilst the proc lock is held, copy the VM domain data out
	 * using the VM domain method.
	 */
	vm_domain_policy_init(&p2->p_vm_dom_policy);
	vm_domain_policy_localcopy(&p2->p_vm_dom_policy,
	    &p1->p_vm_dom_policy);

	if (fr->fr_flags & RFSIGSHARE) {
		p2->p_sigacts = sigacts_hold(p1->p_sigacts);
	} else {
		sigacts_copy(newsigacts, p1->p_sigacts);
		p2->p_sigacts = newsigacts;
	}

	if (fr->fr_flags & RFTSIGZMB)
	        p2->p_sigparent = RFTSIGNUM(fr->fr_flags);
	else if (fr->fr_flags & RFLINUXTHPN)
	        p2->p_sigparent = SIGUSR1;
	else
	        p2->p_sigparent = SIGCHLD;

	p2->p_textvp = p1->p_textvp;
	p2->p_fd = fd;
	p2->p_fdtol = fdtol;

	if (p1->p_flag2 & P2_INHERIT_PROTECTED) {
		p2->p_flag |= P_PROTECTED;
		p2->p_flag2 |= P2_INHERIT_PROTECTED;
	}

	/*
	 * p_limit is copy-on-write.  Bump its refcount.
	 */
	lim_fork(p1, p2);

	thread_cow_get_proc(td2, p2);

	pstats_fork(p1->p_stats, p2->p_stats);

	PROC_UNLOCK(p1);
	PROC_UNLOCK(p2);

	/* Bump references to the text vnode (for procfs). */
	if (p2->p_textvp)
		vrefact(p2->p_textvp);

	/*
	 * Set up linkage for kernel based threading.
	 */
	if ((fr->fr_flags & RFTHREAD) != 0) {
		mtx_lock(&ppeers_lock);
		p2->p_peers = p1->p_peers;
		p1->p_peers = p2;
		p2->p_leader = p1->p_leader;
		mtx_unlock(&ppeers_lock);
		PROC_LOCK(p1->p_leader);
		if ((p1->p_leader->p_flag & P_WEXIT) != 0) {
			PROC_UNLOCK(p1->p_leader);
			/*
			 * The task leader is exiting, so process p1 is
			 * going to be killed shortly.  Since p1 obviously
			 * isn't dead yet, we know that the leader is either
			 * sending SIGKILL's to all the processes in this
			 * task or is sleeping waiting for all the peers to
			 * exit.  We let p1 complete the fork, but we need
			 * to go ahead and kill the new process p2 since
			 * the task leader may not get a chance to send
			 * SIGKILL to it.  We leave it on the list so that
			 * the task leader will wait for this new process
			 * to commit suicide.
			 */
			PROC_LOCK(p2);
			kern_psignal(p2, SIGKILL);
			PROC_UNLOCK(p2);
		} else
			PROC_UNLOCK(p1->p_leader);
	} else {
		p2->p_peers = NULL;
		p2->p_leader = p2;
	}

	sx_xlock(&proctree_lock);
	PGRP_LOCK(p1->p_pgrp);
	PROC_LOCK(p2);
	PROC_LOCK(p1);

	/*
	 * Preserve some more flags in subprocess.  P_PROFIL has already
	 * been preserved.
	 */
	p2->p_flag |= p1->p_flag & P_SUGID;
	td2->td_pflags |= (td->td_pflags & TDP_ALTSTACK) | TDP_FORKING;
	SESS_LOCK(p1->p_session);
	if (p1->p_session->s_ttyvp != NULL && p1->p_flag & P_CONTROLT)
		p2->p_flag |= P_CONTROLT;
	SESS_UNLOCK(p1->p_session);
	if (fr->fr_flags & RFPPWAIT)
		p2->p_flag |= P_PPWAIT;

	p2->p_pgrp = p1->p_pgrp;
	LIST_INSERT_AFTER(p1, p2, p_pglist);
	PGRP_UNLOCK(p1->p_pgrp);
	LIST_INIT(&p2->p_children);
	LIST_INIT(&p2->p_orphans);

	callout_init_mtx(&p2->p_itcallout, &p2->p_mtx, 0);

	/*
	 * If PF_FORK is set, the child process inherits the
	 * procfs ioctl flags from its parent.
	 */
	if (p1->p_pfsflags & PF_FORK) {
		p2->p_stops = p1->p_stops;
		p2->p_pfsflags = p1->p_pfsflags;
	}

	/*
	 * This begins the section where we must prevent the parent
	 * from being swapped.
	 */
	_PHOLD(p1);
	PROC_UNLOCK(p1);

	/*
	 * Attach the new process to its parent.
	 *
	 * If RFNOWAIT is set, the newly created process becomes a child
	 * of init.  This effectively disassociates the child from the
	 * parent.
	 */
	if ((fr->fr_flags & RFNOWAIT) != 0) {
		pptr = p1->p_reaper;
		p2->p_reaper = pptr;
	} else {
		p2->p_reaper = (p1->p_treeflag & P_TREE_REAPER) != 0 ?
		    p1 : p1->p_reaper;
		pptr = p1;
	}
	p2->p_pptr = pptr;
	LIST_INSERT_HEAD(&pptr->p_children, p2, p_sibling);
	LIST_INIT(&p2->p_reaplist);
	LIST_INSERT_HEAD(&p2->p_reaper->p_reaplist, p2, p_reapsibling);
	if (p2->p_reaper == p1)
		p2->p_reapsubtree = p2->p_pid;
	sx_xunlock(&proctree_lock);

	/* Inform accounting that we have forked. */
	p2->p_acflag = AFORK;
	PROC_UNLOCK(p2);

#ifdef KTRACE
	ktrprocfork(p1, p2);
#endif

	/*
	 * Finish creating the child process.  It will return via a different
	 * execution path later.  (ie: directly into user mode)
	 */
	vm_forkproc(td, p2, td2, vm2, fr->fr_flags);

	if (fr->fr_flags == (RFFDG | RFPROC)) {
		VM_CNT_INC(v_forks);
		VM_CNT_ADD(v_forkpages, p2->p_vmspace->vm_dsize +
		    p2->p_vmspace->vm_ssize);
	} else if (fr->fr_flags == (RFFDG | RFPROC | RFPPWAIT | RFMEM)) {
		VM_CNT_INC(v_vforks);
		VM_CNT_ADD(v_vforkpages, p2->p_vmspace->vm_dsize +
		    p2->p_vmspace->vm_ssize);
	} else if (p1 == &proc0) {
		VM_CNT_INC(v_kthreads);
		VM_CNT_ADD(v_kthreadpages, p2->p_vmspace->vm_dsize +
		    p2->p_vmspace->vm_ssize);
	} else {
		VM_CNT_INC(v_rforks);
		VM_CNT_ADD(v_rforkpages, p2->p_vmspace->vm_dsize +
		    p2->p_vmspace->vm_ssize);
	}

	/*
	 * Associate the process descriptor with the process before anything
	 * can happen that might cause that process to need the descriptor.
	 * However, don't do this until after fork(2) can no longer fail.
	 */
	if (fr->fr_flags & RFPROCDESC)
		procdesc_new(p2, fr->fr_pd_flags);

	/*
	 * Both processes are set up, now check if any loadable modules want
	 * to adjust anything.
	 */
	EVENTHANDLER_INVOKE(process_fork, p1, p2, fr->fr_flags);

	/*
	 * Set the child start time and mark the process as being complete.
	 */
	PROC_LOCK(p2);
	PROC_LOCK(p1);
	microuptime(&p2->p_stats->p_start);
	PROC_SLOCK(p2);
	p2->p_state = PRS_NORMAL;
	PROC_SUNLOCK(p2);

#ifdef KDTRACE_HOOKS
	/*
	 * Tell the DTrace fasttrap provider about the new process so that any
	 * tracepoints inherited from the parent can be removed. We have to do
	 * this only after p_state is PRS_NORMAL since the fasttrap module will
	 * use pfind() later on.
	 */
	if ((fr->fr_flags & RFMEM) == 0 && dtrace_fasttrap_fork)
		dtrace_fasttrap_fork(p1, p2);
#endif
	/*
	 * Hold the process so that it cannot exit after we make it runnable,
	 * but before we wait for the debugger.
	 */
	_PHOLD(p2);
	if (p1->p_ptevents & PTRACE_FORK) {
		/*
		 * Arrange for debugger to receive the fork event.
		 *
		 * We can report PL_FLAG_FORKED regardless of
		 * P_FOLLOWFORK settings, but it does not make a sense
		 * for runaway child.
		 */
		td->td_dbgflags |= TDB_FORK;
		td->td_dbg_forked = p2->p_pid;
		td2->td_dbgflags |= TDB_STOPATFORK;
	}
	if (fr->fr_flags & RFPPWAIT) {
		td->td_pflags |= TDP_RFPPWAIT;
		td->td_rfppwait_p = p2;
		td->td_dbgflags |= TDB_VFORK;
	}
	PROC_UNLOCK(p2);

	/*
	 * Now can be swapped.
	 */
	_PRELE(p1);
	PROC_UNLOCK(p1);

	/*
	 * Tell any interested parties about the new process.
	 */
	knote_fork(p1->p_klist, p2->p_pid);
	SDT_PROBE3(proc, , , create, p2, p1, fr->fr_flags);

	if (fr->fr_flags & RFPROCDESC) {
		procdesc_finit(p2->p_procdesc, fp_procdesc);
		fdrop(fp_procdesc, td);
	}

	if ((fr->fr_flags & RFSTOPPED) == 0) {
		/*
		 * If RFSTOPPED not requested, make child runnable and
		 * add to run queue.
		 */
		thread_lock(td2);
		TD_SET_CAN_RUN(td2);
		sched_add(td2, SRQ_BORING);
		thread_unlock(td2);
		if (fr->fr_pidp != NULL)
			*fr->fr_pidp = p2->p_pid;
	} else {
		*fr->fr_procp = p2;
	}

	PROC_LOCK(p2);
	/*
	 * Wait until debugger is attached to child.
	 */
	while (td2->td_proc == p2 && (td2->td_dbgflags & TDB_STOPATFORK) != 0)
		cv_wait(&p2->p_dbgwait, &p2->p_mtx);
	_PRELE(p2);
	racct_proc_fork_done(p2);
	PROC_UNLOCK(p2);
}
示例#27
0
static int
dcons_os_checkc(struct dcons_softc *dc)
{
	EVENTHANDLER_INVOKE(dcons_poll, 0);
	return (dcons_os_checkc_nopoll(dc));
}