C++ ISALIVE函数代码示例

/* Store new weight in real_server struct and then update kernel. */
void
update_svr_wgt(int weight, virtual_server * vs, real_server * rs)
{
	char rsip[INET6_ADDRSTRLEN];

	if (weight != rs->weight) {
		log_message(LOG_INFO, "Changing weight from %d to %d for %s service [%s]:%d of VS [%s]:%d"
				    , rs->weight
				    , weight
				    , ISALIVE(rs) ? "active" : "inactive"
				    , inet_sockaddrtos2(&rs->addr, rsip)
				    , ntohs(inet_sockaddrport(&rs->addr))
				    , (vs->vsgname) ? vs->vsgname : inet_sockaddrtos(&vs->addr)
				    , ntohs(inet_sockaddrport(&vs->addr)));
		rs->weight = weight;
		/*
		 * Have weight change take effect now only if rs is in
		 * the pool and alive and the quorum is met (or if
		 * there is no sorry server). If not, it will take
		 * effect later when it becomes alive.
		 */
		if (rs->set && ISALIVE(rs) &&
		    (vs->quorum_state == UP || !vs->s_svr || !ISALIVE(vs->s_svr)))
			ipvs_cmd(LVS_CMD_EDIT_DEST, check_data->vs_group, vs, rs);
		update_quorum_state(vs);
	}
}

/* Store new weight in real_server struct and then update kernel. */
void
update_svr_wgt(int weight, virtual_server_t * vs, real_server_t * rs
		, int update_quorum)
{
	if (weight != rs->weight) {
		log_message(LOG_INFO, "Changing weight from %d to %d for %s service %s of VS %s"
				    , rs->weight
				    , weight
				    , ISALIVE(rs) ? "active" : "inactive"
				    , FMT_RS(rs)
				    , FMT_VS(vs));
		rs->weight = weight;
		/*
		 * Have weight change take effect now only if rs is in
		 * the pool and alive and the quorum is met (or if
		 * there is no sorry server). If not, it will take
		 * effect later when it becomes alive.
		 */
		if (rs->set && ISALIVE(rs) &&
		    (vs->quorum_state == UP || !vs->s_svr || !ISALIVE(vs->s_svr)))
			ipvs_cmd(LVS_CMD_EDIT_DEST, vs, rs);
		if (update_quorum)
			update_quorum_state(vs);
	}
}

/* Set a virtualserver IPVS rules */
static int
init_service_vs(virtual_server_t * vs)
{
	/* Init the VS root */
	if (!ISALIVE(vs) || vs->vsgname) {
		if (!ipvs_cmd(LVS_CMD_ADD, vs, NULL))
			return 0;
		else
			SET_ALIVE(vs);
	}

	/* Processing real server queue */
	if (!init_service_rs(vs))
		return 0;

	if (vs->reloaded) {
		if (vs->vsgname)
			/* add reloaded dests into new vsg entries */
			sync_service_vsg(vs);

		/* we may have got/lost quorum due to quorum setting changed */
		update_quorum_state(vs);
	}

	return 1;
}

/* Set a realserver IPVS rules */
static int
init_service_rs(virtual_server * vs)
{
	element e;
	real_server *rs;

	for (e = LIST_HEAD(vs->rs); e; ELEMENT_NEXT(e)) {
		rs = ELEMENT_DATA(e);
		/* In alpha mode, be pessimistic (or realistic?) and don't
		 * add real servers into the VS pool. They will get there
		 * later upon healthchecks recovery (if ever).
		 */
		if (vs->alpha) {
			UNSET_ALIVE(rs);
			continue;
		}
		if (!ISALIVE(rs)) {
			if (!ipvs_cmd(LVS_CMD_ADD_DEST, check_data->vs_group, vs, rs))
				return 0;
			else
				SET_ALIVE(rs);
		} else if (vs->vsgname) {
			UNSET_ALIVE(rs);
			if (!ipvs_cmd(LVS_CMD_ADD_DEST, check_data->vs_group, vs, rs))
				return 0;
			SET_ALIVE(rs);
		}
	}

	return 1;
}

/* Set a realserver IPVS rules */
static int
init_service_rs(virtual_server_t * vs)
{
	element e;
	real_server_t *rs;

	for (e = LIST_HEAD(vs->rs); e; ELEMENT_NEXT(e)) {
		rs = ELEMENT_DATA(e);
		/* Do not re-add failed RS instantly on reload */
		if (rs->reloaded) {
			/* force re-adding of the rs into vs_group:
			 * we may have new vsg entries */
			if (vs->vsgname)
				UNSET_ALIVE(rs);
			continue;
		}
		/* In alpha mode, be pessimistic (or realistic?) and don't
		 * add real servers into the VS pool. They will get there
		 * later upon healthchecks recovery (if ever).
		 */
		if (vs->alpha) {
			UNSET_ALIVE(rs);
			continue;
		}
		if (!ISALIVE(rs)) {
			if (!ipvs_cmd(LVS_CMD_ADD_DEST, check_data->vs_group, vs, rs))
				return 0;
			SET_ALIVE(rs);
		}
	}

	return 1;
}

/* Set a virtualserver IPVS rules */
static int
init_service_vs(virtual_server_t * vs)
{
	/* Init the VS root */
	if (!ISALIVE(vs) || vs->vsgname) {
		if (!ipvs_cmd(LVS_CMD_ADD, check_data->vs_group, vs, NULL))
			return 0;
		else
			SET_ALIVE(vs);
	}

	/* Processing real server queue */
	if (!LIST_ISEMPTY(vs->rs)) {
		if (vs->alpha && ! vs->reloaded)
			vs->quorum_state = DOWN;
		if (!init_service_rs(vs))
			return 0;
	}

	/* if the service was reloaded, we may have got/lost quorum due to quorum setting changed */
	if (vs->reloaded)
		update_quorum_state(vs);

	return 1;
}

/* Set a realserver IPVS rules */
static int
init_service_rs(virtual_server_t * vs)
{
	element e;
	real_server_t *rs;

	if (LIST_ISEMPTY(vs->rs)) {
		log_message(LOG_WARNING, "VS [%s] has no configured RS! Skipping RS activation."
				       , FMT_VS(vs));
		return 1;
	}

	for (e = LIST_HEAD(vs->rs); e; ELEMENT_NEXT(e)) {
		rs = ELEMENT_DATA(e);

		if (rs->reloaded) {
			if (rs->iweight != rs->pweight)
				update_svr_wgt(rs->iweight, vs, rs, 0);
			/* Do not re-add failed RS instantly on reload */
			continue;
		}
		/* In alpha mode, be pessimistic (or realistic?) and don't
		 * add real servers into the VS pool. They will get there
		 * later upon healthchecks recovery (if ever).
		 */
		if (!vs->alpha && !ISALIVE(rs)) {
			ipvs_cmd(LVS_CMD_ADD_DEST, vs, rs);
			SET_ALIVE(rs);
		}
	}

	return 1;
}

/* Remove a realserver IPVS rule */
static int
clear_service_rs(virtual_server_t * vs, list l)
{
	element e;
	real_server_t *rs;
	long weight_sum;
	long down_threshold = vs->quorum - vs->hysteresis;

	for (e = LIST_HEAD(l); e; ELEMENT_NEXT(e)) {
		rs = ELEMENT_DATA(e);
		if (ISALIVE(rs)) {
			log_message(LOG_INFO, "Removing service %s from VS %s"
						, FMT_RS(rs)
						, FMT_VS(vs));
			if (!ipvs_cmd(LVS_CMD_DEL_DEST, vs, rs))
				return 0;
			UNSET_ALIVE(rs);
			if (!vs->omega)
				continue;

			/* In Omega mode we call VS and RS down notifiers
			 * all the way down the exit, as necessary.
			 */
			if (rs->notify_down) {
				log_message(LOG_INFO, "Executing [%s] for service %s in VS %s"
						    , rs->notify_down
						    , FMT_RS(rs)
						    , FMT_VS(vs));
				notify_exec(rs->notify_down);
			}
#ifdef _WITH_SNMP_
			check_snmp_rs_trap(rs, vs);
#endif

			/* Sooner or later VS will lose the quorum (if any). However,
			 * we don't push in a sorry server then, hence the regression
			 * is intended.
			 */
			weight_sum = weigh_live_realservers(vs);
			if (vs->quorum_state == UP && (
				!weight_sum ||
				weight_sum < down_threshold)
			) {
				vs->quorum_state = DOWN;
				if (vs->quorum_down) {
					log_message(LOG_INFO, "Executing [%s] for VS %s"
							    , vs->quorum_down
							    , FMT_VS(vs));
					notify_exec(vs->quorum_down);
				}
#ifdef _WITH_SNMP_
				check_snmp_quorum_trap(vs);
#endif
			}
		}
	}

	return 1;
}

/* Remove a realserver IPVS rule */
static int
clear_service_rs(list vs_group, virtual_server * vs, list l)
{
	element e;
	real_server *rs;
	char rsip[16], vsip[16];

	for (e = LIST_HEAD(l); e; ELEMENT_NEXT(e)) {
		rs = ELEMENT_DATA(e);
		if (ISALIVE(rs)) {
			if (!ipvs_cmd(LVS_CMD_DEL_DEST
				      , vs_group
				      , vs
				      , rs))
				return 0;
			UNSET_ALIVE(rs);
			if (!vs->omega)
				continue;

			/* In Omega mode we call VS and RS down notifiers
			 * all the way down the exit, as necessary.
			 */
			if (rs->notify_down) {
				log_message(LOG_INFO, "Executing [%s] for service [%s:%d]"
					    " in VS [%s:%d]"
					    , rs->notify_down
					    , inet_ntoa2(SVR_IP(rs), rsip)
					    , ntohs(SVR_PORT(rs))
					    , (vs->vsgname) ? vs->vsgname : inet_ntoa2(SVR_IP(vs), vsip)
					    , ntohs(SVR_PORT(vs)));
				notify_exec(rs->notify_down);
			}

			/* Sooner or later VS will lose the quorum (if any). However,
			 * we don't push in a sorry server then, hence the regression
			 * is intended.
			 */
			if (vs->quorum_state == UP && vs->quorum_down
			  && weigh_live_realservers(vs) < vs->quorum - vs->hysteresis) {
				vs->quorum_state = DOWN;
				log_message(LOG_INFO, "Executing [%s] for VS [%s:%d]"
					    , vs->quorum_down
					    , (vs->vsgname) ? vs->vsgname : inet_ntoa2(SVR_IP(vs), vsip)
					    , ntohs(SVR_PORT(vs)));
				notify_exec(vs->quorum_down);
			}
		}
#ifdef _KRNL_2_2_
		/* if we have a /32 mask, we create one nat rules per
		 * realserver.
		 */
		if (vs->nat_mask == HOST_NETMASK)
			if (!ipfw_cmd(IP_FW_CMD_DEL, vs, rs))
				return 0;
#endif
	}
	return 1;
}

int
kvm_getcptime(kvm_t *kd, long *cp_time)
{
	struct pcpu *pc;
	int i, j, maxcpu;

	if (kd == NULL) {
		kvm_cp_time_cached = 0;
		return (0);
	}

	if (ISALIVE(kd))
		return (getsysctl(kd, "kern.cp_time", cp_time, sizeof(long) *
		    CPUSTATES));

	if (!kd->arch->ka_native(kd)) {
		_kvm_err(kd, kd->program,
		    "cannot read cp_time from non-native core");
		return (-1);
	}

	if (kvm_cp_time_cached == 0) {
		if (_kvm_cp_time_init(kd) < 0)
			return (-1);
	}

	/* If this kernel has a "cp_time[]" symbol, then just read that. */
	if (kvm_cp_time_nl[NL_CP_TIME].n_value != 0) {
		if (kvm_read(kd, kvm_cp_time_nl[NL_CP_TIME].n_value, cp_time,
		    sizeof(long) * CPUSTATES) != sizeof(long) * CPUSTATES) {
			_kvm_err(kd, kd->program, "cannot read cp_time array");
			return (-1);
		}
		return (0);
	}

	/*
	 * If we don't have that symbol, then we have to simulate
	 * "cp_time[]" by adding up the individual times for each CPU.
	 */
	maxcpu = kvm_getmaxcpu(kd);
	if (maxcpu < 0)
		return (-1);
	for (i = 0; i < CPUSTATES; i++)
		cp_time[i] = 0;
	for (i = 0; i < maxcpu; i++) {
		pc = kvm_getpcpu(kd, i);
		if (pc == NULL)
			continue;
		if (pc == (void *)-1)
			return (-1);
		for (j = 0; j < CPUSTATES; j++)
			cp_time[j] += pc->pc_cp_time[j];
		free(pc);
	}
	return (0);
}

static int
_arm_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
{
	struct vmstate *vm;
	arm_pt_entry_t pte;
	arm_physaddr_t offset, a;
	kvaddr_t pteindex;
	off_t ofs;
	arm_pt_entry_t *ptemap;

	if (ISALIVE(kd)) {
		_kvm_err(kd, 0, "_arm_minidump_kvatop called in live kernel!");
		return (0);
	}

	vm = kd->vmst;
	ptemap = vm->ptemap;

	if (va >= vm->hdr.kernbase) {
		pteindex = (va - vm->hdr.kernbase) >> ARM_PAGE_SHIFT;
		if (pteindex >= vm->hdr.ptesize / sizeof(*ptemap))
			goto invalid;
		pte = _kvm32toh(kd, ptemap[pteindex]);
		if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_INV) {
			_kvm_err(kd, kd->program,
			    "_arm_minidump_kvatop: pte not valid");
			goto invalid;
		}
		if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) {
			/* 64K page -> convert to be like 4K page */
			offset = va & ARM_L2_S_OFFSET;
			a = (pte & ARM_L2_L_FRAME) +
			    (va & ARM_L2_L_OFFSET & ARM_L2_S_FRAME);
		} else {
			if (kd->vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_V4 &&
			    (pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_T) {
				_kvm_err(kd, kd->program,
				    "_arm_minidump_kvatop: pte not supported");
				goto invalid;
			}
			/* 4K page */
			offset = va & ARM_L2_S_OFFSET;
			a = pte & ARM_L2_S_FRAME;
		}

		ofs = _kvm_pt_find(kd, a);
		if (ofs == -1) {
			_kvm_err(kd, kd->program, "_arm_minidump_kvatop: "
			    "physical address 0x%jx not in minidump",
			    (uintmax_t)a);
			goto invalid;
		}

		*pa = ofs + offset;
		return (ARM_PAGE_SIZE - offset);
	} else

/*
 * Translate a kernel virtual address to a physical address.
 */
int
_kvm_kvatop(kvm_t *kd, u_long va, paddr_t *pa)
{
	struct vmstate *vm;
	pt_entry_t pte;
	u_long idx, addr;
	int offset;

	if (ISALIVE(kd)) {
		_kvm_err(kd, 0, "vatop called in live kernel!");
		return((off_t)0);
	}
	vm = kd->vmst;
	offset = (int)va & vm->pagemask;
	/*
	 * If we are initializing (kernel segment table pointer not yet set)
	 * then return pa == va to avoid infinite recursion.
	 */
	if (vm->Sysmap == 0) {
		*pa = va;
		return vm->pagesize - offset;
	}
	/*
	 * Check for direct-mapped segments
	 */
	if (IS_XKPHYS(va)) {
		*pa = XKPHYS_TO_PHYS(va);
		return vm->pagesize - offset;
	}
	if (va >= (vaddr_t)CKSEG0_BASE && va < (vaddr_t)CKSSEG_BASE) {
		*pa = CKSEG0_TO_PHYS(va);
		return vm->pagesize - offset;
	}
	if (va < vm->Sysmapbase)
		goto invalid;
	idx = (va - vm->Sysmapbase) >> vm->pageshift;
	if (idx >= vm->Sysmapsize)
		goto invalid;
	addr = (u_long)vm->Sysmap + idx;
	/*
	 * Can't use KREAD to read kernel segment table entries.
	 * Fortunately it is 1-to-1 mapped so we don't have to.
	 */
	if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte),
	    (off_t)addr) < 0)
		goto invalid;
	if (!(pte & PG_V))
		goto invalid;
	*pa = (pte & PG_FRAME) | (paddr_t)offset;
	return vm->pagesize - offset;

invalid:
	_kvm_err(kd, 0, "invalid address (%lx)", va);
	return (0);
}

int
_kvm_kvatop(kvm_t *kd, u_long va, paddr_t *pa)
{
	if (ISALIVE(kd)) {
		_kvm_err(kd, 0, "vatop called in live kernel!");
		return (0);
	}

	/* XXX this only really works for the kernel image only */
	*pa = va;
	return (kd->nbpg - (va & (kd->nbpg - 1)));
}

/*
 * Translate a KVA to a PA
 */
int
_kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa)
{
//	cpu_kcore_hdr_t	*cpu_kh;

	if (ISALIVE(kd)) {
		_kvm_err(kd, 0, "vatop called in live kernel!");
		return 0;
	}

	/* No hit -- no translation */
	*pa = (u_long)~0UL;
	return 0;
}

/* Returns the sum of all RS weight in a virtual server. */
long unsigned
weigh_live_realservers(virtual_server * vs)
{
	element e;
	real_server *svr;
	long unsigned count = 0;

	for (e = LIST_HEAD(vs->rs); e; ELEMENT_NEXT(e)) {
		svr = ELEMENT_DATA(e);
		if (ISALIVE(svr))
			count += svr->weight;
	}
	return count;
}