* registered send-once right. If notify is IP_NULL,
* just cancels the previously registered request.
*
- * This interacts with the IE_BITS_COMPAT, because they
- * both use ie_request. If this is a compat entry, then
- * previous always gets IP_NULL. If notify is IP_NULL,
- * then the entry remains a compat entry. Otherwise
- * the real dead-name request is registered and the entry
- * is no longer a compat entry.
* Conditions:
* Nothing locked. May allocate memory.
* Only consumes/returns refs if successful.
*/
kern_return_t
-ipc_right_dnrequest(
+ipc_right_request_alloc(
ipc_space_t space,
mach_port_name_t name,
boolean_t immediate,
+ boolean_t send_possible,
ipc_port_t notify,
ipc_port_t *previousp)
{
- ipc_port_t previous;
+ ipc_port_request_index_t prev_request;
+ ipc_port_t previous = IP_NULL;
+ ipc_entry_t entry;
+ kern_return_t kr;
for (;;) {
- ipc_entry_t entry;
- ipc_entry_bits_t bits;
- kern_return_t kr;
-
kr = ipc_right_lookup_write(space, name, &entry);
if (kr != KERN_SUCCESS)
return kr;
+
/* space is write-locked and active */
- bits = entry->ie_bits;
- if (bits & MACH_PORT_TYPE_PORT_RIGHTS) {
+
+ prev_request = entry->ie_request;
+
+ /* if nothing to do or undo, we're done */
+ if (notify == IP_NULL && prev_request == IE_REQ_NONE) {
+ is_write_unlock(space);
+ *previousp = IP_NULL;
+ return KERN_SUCCESS;
+ }
+
+ /* see if the entry is of proper type for requests */
+ if (entry->ie_bits & MACH_PORT_TYPE_PORT_RIGHTS) {
+ ipc_port_request_index_t new_request;
ipc_port_t port;
- ipc_port_request_index_t request;
port = (ipc_port_t) entry->ie_object;
assert(port != IP_NULL);
if (!ipc_right_check(space, port, name, entry)) {
/* port is locked and active */
+ /* if no new request, just cancel previous */
if (notify == IP_NULL) {
- previous = ipc_right_dncancel_macro(
- space, port, name, entry);
-
+ if (prev_request != IE_REQ_NONE)
+ previous = ipc_port_request_cancel(port, name, prev_request);
ip_unlock(port);
+ entry->ie_request = IE_REQ_NONE;
is_write_unlock(space);
break;
}
/*
- * If a registered soright exists,
- * want to atomically switch with it.
- * If ipc_port_dncancel finds us a
- * soright, then the following
- * ipc_port_dnrequest will reuse
- * that slot, so we are guaranteed
- * not to unlock and retry.
+ * send-once rights, kernel objects, and non-full other queues
+ * fire immediately (if immediate specified).
*/
+ if (send_possible && immediate &&
+ ((entry->ie_bits & MACH_PORT_TYPE_SEND_ONCE) ||
+ port->ip_receiver == ipc_space_kernel || !ip_full(port))) {
+ if (prev_request != IE_REQ_NONE)
+ previous = ipc_port_request_cancel(port, name, prev_request);
+ ip_unlock(port);
+ entry->ie_request = IE_REQ_NONE;
+ is_write_unlock(space);
- previous = ipc_right_dncancel_macro(space,
- port, name, entry);
+ ipc_notify_send_possible(notify, name);
+ break;
+ }
- kr = ipc_port_dnrequest(port, name, notify,
- &request);
+ /*
+ * If there is a previous request, free it. Any subsequent
+ * allocation cannot fail, thus assuring an atomic swap.
+ */
+ if (prev_request != IE_REQ_NONE)
+ previous = ipc_port_request_cancel(port, name, prev_request);
+
+ kr = ipc_port_request_alloc(port, name, notify,
+ send_possible, immediate,
+ &new_request);
if (kr != KERN_SUCCESS) {
assert(previous == IP_NULL);
is_write_unlock(space);
- kr = ipc_port_dngrow(port,
- ITS_SIZE_NONE);
+ kr = ipc_port_request_grow(port, ITS_SIZE_NONE);
/* port is unlocked */
+
if (kr != KERN_SUCCESS)
return kr;
continue;
}
- assert(request != 0);
+ assert(new_request != IE_REQ_NONE);
ip_unlock(port);
-
- entry->ie_request = request;
+ entry->ie_request = new_request;
is_write_unlock(space);
break;
- } else {
-
- /*
- * Our capability bits were changed by ipc_right_check
- * because it found an inactive port and removed our
- * references to it (converting our entry into a dead
- * one). Reload the bits (and obviously we can't use
- * the port name anymore).
- */
- bits = entry->ie_bits;
-
}
+ /* entry may have changed to dead-name by ipc_right_check() */
- assert(bits & MACH_PORT_TYPE_DEAD_NAME);
}
- if ((bits & MACH_PORT_TYPE_DEAD_NAME) &&
- immediate && (notify != IP_NULL)) {
- mach_port_urefs_t urefs = IE_BITS_UREFS(bits);
+ /* treat send_possible requests as immediate w.r.t. dead-name */
+ if ((send_possible || immediate) && notify != IP_NULL &&
+ (entry->ie_bits & MACH_PORT_TYPE_DEAD_NAME)) {
+ mach_port_urefs_t urefs = IE_BITS_UREFS(entry->ie_bits);
- assert(IE_BITS_TYPE(bits) == MACH_PORT_TYPE_DEAD_NAME);
assert(urefs > 0);
if (MACH_PORT_UREFS_OVERFLOW(urefs, 1)) {
}
is_write_unlock(space);
- if (bits & MACH_PORT_TYPE_PORT_OR_DEAD)
+ if (entry->ie_bits & MACH_PORT_TYPE_PORT_OR_DEAD)
return KERN_INVALID_ARGUMENT;
else
return KERN_INVALID_RIGHT;
}
/*
- * Routine: ipc_right_dncancel
+ * Routine: ipc_right_request_cancel
* Purpose:
- * Cancel a dead-name request and return the send-once right.
+ * Cancel a notification request and return the send-once right.
* Afterwards, entry->ie_request == 0.
* Conditions:
* The space must be write-locked; the port must be locked.
*/
ipc_port_t
-ipc_right_dncancel(
+ipc_right_request_cancel(
__unused ipc_space_t space,
ipc_port_t port,
mach_port_name_t name,
ipc_entry_t entry)
{
- ipc_port_t dnrequest;
+ ipc_port_t previous;
assert(ip_active(port));
assert(port == (ipc_port_t) entry->ie_object);
- dnrequest = ipc_port_dncancel(port, name, entry->ie_request);
- entry->ie_request = 0;
+ if (entry->ie_request == IE_REQ_NONE)
+ return IP_NULL;
- return dnrequest;
+ previous = ipc_port_request_cancel(port, name, entry->ie_request);
+ entry->ie_request = IE_REQ_NONE;
+ return previous;
}
/*
}
- ipc_port_release(port);
-
/* convert entry to dead name */
if ((bits & MACH_PORT_TYPE_SEND) && !(bits & MACH_PORT_TYPE_RECEIVE))
/*
* If there was a notification request outstanding on this
- * name, and since the port went dead, that notification
- * must already be on its way up from the port layer. We
- * don't need the index of the notification port anymore.
+ * name, and the port went dead, that notification
+ * must already be on its way up from the port layer.
+ *
+ * Add the reference that the notification carries. It
+ * is done here, and not in the notification delivery,
+ * because the latter doesn't have a space reference and
+ * trying to actually move a send-right reference would
+ * get short-circuited into a MACH_PORT_DEAD by IPC. Since
+ * all calls that deal with the right eventually come
+ * through here, it has the same result.
*
- * JMM - We also add a reference to the entry since the
- * notification only carries the name and NOT a reference
- * (or right). This makes for pretty loose reference
- * counting, since it is only happenstance that we
- * detected the notification in progress like this.
- * But most (all?) calls that try to deal with this entry
- * will also come through here, so the reference gets added
- * before the entry gets used eventually (I would rather it
- * be explicit in the notification generation, though)
+ * Once done, clear the request index so we only account
+ * for it once.
*/
- if (entry->ie_request != 0) {
- assert(IE_BITS_UREFS(bits) < MACH_PORT_UREFS_MAX);
- entry->ie_request = 0;
- bits++;
+ if (entry->ie_request != IE_REQ_NONE) {
+ if (ipc_port_request_type(port, name, entry->ie_request) != 0) {
+ assert(IE_BITS_UREFS(bits) < MACH_PORT_UREFS_MAX);
+ bits++;
+ }
+ entry->ie_request = IE_REQ_NONE;
}
entry->ie_bits = bits;
entry->ie_object = IO_NULL;
+
+ ipc_port_release(port);
+
return TRUE;
}
switch (type) {
case MACH_PORT_TYPE_DEAD_NAME:
- assert(entry->ie_request == 0);
+ assert(entry->ie_request == IE_REQ_NONE);
assert(entry->ie_object == IO_NULL);
break;
case MACH_PORT_TYPE_PORT_SET: {
ipc_pset_t pset = (ipc_pset_t) entry->ie_object;
- assert(entry->ie_request == 0);
+ assert(entry->ie_request == IE_REQ_NONE);
assert(pset != IPS_NULL);
ips_lock(pset);
case MACH_PORT_TYPE_SEND_RECEIVE:
case MACH_PORT_TYPE_SEND_ONCE: {
ipc_port_t port = (ipc_port_t) entry->ie_object;
- ipc_port_t dnrequest;
+ ipc_port_t request;
ipc_port_t nsrequest = IP_NULL;
mach_port_mscount_t mscount = 0;
break;
}
- dnrequest = ipc_right_dncancel_macro(space, port,
+ request = ipc_right_request_cancel_macro(space, port,
name, entry);
if (type & MACH_PORT_TYPE_SEND) {
if (nsrequest != IP_NULL)
ipc_notify_no_senders(nsrequest, mscount);
- if (dnrequest != IP_NULL)
- ipc_notify_port_deleted(dnrequest, name);
+ if (request != IP_NULL)
+ ipc_notify_port_deleted(request, name);
break;
}
switch (type) {
case MACH_PORT_TYPE_DEAD_NAME:
- assert(entry->ie_request == 0);
+ assert(entry->ie_request == IE_REQ_NONE);
assert(entry->ie_object == IO_NULL);
ipc_entry_dealloc(space, name, entry);
case MACH_PORT_TYPE_PORT_SET: {
ipc_pset_t pset = (ipc_pset_t) entry->ie_object;
- assert(entry->ie_request == 0);
+ assert(entry->ie_request == IE_REQ_NONE);
assert(pset != IPS_NULL);
entry->ie_object = IO_NULL;
ipc_port_t port = (ipc_port_t) entry->ie_object;
ipc_port_t nsrequest = IP_NULL;
mach_port_mscount_t mscount = 0;
- ipc_port_t dnrequest;
+ ipc_port_t request;
assert(port != IP_NULL);
ip_release(port);
ip_check_unlock(port);
- entry->ie_request = 0;
+ entry->ie_request = IE_REQ_NONE;
entry->ie_object = IO_NULL;
ipc_entry_dealloc(space, name, entry);
break;
}
- dnrequest = ipc_right_dncancel_macro(space, port, name, entry);
+ request = ipc_right_request_cancel_macro(space, port, name, entry);
entry->ie_object = IO_NULL;
ipc_entry_dealloc(space, name, entry);
if (nsrequest != IP_NULL)
ipc_notify_no_senders(nsrequest, mscount);
- if (dnrequest != IP_NULL)
- ipc_notify_port_deleted(dnrequest, name);
+ if (request != IP_NULL)
+ ipc_notify_port_deleted(request, name);
break;
}
dead_name:
assert(IE_BITS_UREFS(bits) > 0);
- assert(entry->ie_request == 0);
+ assert(entry->ie_request == IE_REQ_NONE);
assert(entry->ie_object == IO_NULL);
if (IE_BITS_UREFS(bits) == 1) {
}
case MACH_PORT_TYPE_SEND_ONCE: {
- ipc_port_t port, dnrequest;
+ ipc_port_t port, request;
assert(IE_BITS_UREFS(bits) == 1);
assert(port->ip_sorights > 0);
- dnrequest = ipc_right_dncancel_macro(space, port, name, entry);
+ request = ipc_right_request_cancel_macro(space, port, name, entry);
ip_unlock(port);
entry->ie_object = IO_NULL;
ipc_notify_send_once(port);
- if (dnrequest != IP_NULL)
- ipc_notify_port_deleted(dnrequest, name);
+ if (request != IP_NULL)
+ ipc_notify_port_deleted(request, name);
break;
}
case MACH_PORT_TYPE_SEND: {
ipc_port_t port;
- ipc_port_t dnrequest = IP_NULL;
+ ipc_port_t request = IP_NULL;
ipc_port_t nsrequest = IP_NULL;
mach_port_mscount_t mscount = 0;
}
}
- dnrequest = ipc_right_dncancel_macro(space, port,
+ request = ipc_right_request_cancel_macro(space, port,
name, entry);
ipc_hash_delete(space, (ipc_object_t) port,
name, entry);
if (nsrequest != IP_NULL)
ipc_notify_no_senders(nsrequest, mscount);
- if (dnrequest != IP_NULL)
- ipc_notify_port_deleted(dnrequest, name);
+ if (request != IP_NULL)
+ ipc_notify_port_deleted(request, name);
break;
}
assert(IE_BITS_TYPE(bits) == MACH_PORT_TYPE_PORT_SET);
assert(IE_BITS_UREFS(bits) == 0);
- assert(entry->ie_request == 0);
+ assert(entry->ie_request == IE_REQ_NONE);
if (delta == 0)
goto success;
case MACH_PORT_RIGHT_RECEIVE: {
ipc_port_t port;
- ipc_port_t dnrequest = IP_NULL;
+ ipc_port_t request = IP_NULL;
if ((bits & MACH_PORT_TYPE_RECEIVE) == 0)
goto invalid_right;
assert(IE_BITS_UREFS(bits) < MACH_PORT_UREFS_MAX);
assert(port->ip_srights > 0);
- /*
- * The remaining send right turns into a
- * dead name. Notice we don't decrement
- * ip_srights, generate a no-senders notif,
- * or use ipc_right_dncancel, because the
- * port is destroyed "first".
- */
- bits &= ~IE_BITS_TYPE_MASK;
- bits |= MACH_PORT_TYPE_DEAD_NAME;
- if (entry->ie_request) {
- entry->ie_request = 0;
- bits++;
+ if (port->ip_pdrequest != NULL) {
+ /*
+ * Since another task has requested a
+ * destroy notification for this port, it
+ * isn't actually being destroyed - the receive
+ * right is just being moved to another task.
+ * Since we still have one or more send rights,
+ * we need to record the loss of the receive
+ * right and enter the remaining send right
+ * into the hash table.
+ */
+ entry->ie_bits &= ~MACH_PORT_TYPE_RECEIVE;
+ ipc_hash_insert(space, (ipc_object_t) port,
+ name, entry);
+ ip_reference(port);
+ } else {
+ /*
+ * The remaining send right turns into a
+ * dead name. Notice we don't decrement
+ * ip_srights, generate a no-senders notif,
+ * or use ipc_right_dncancel, because the
+ * port is destroyed "first".
+ */
+ bits &= ~IE_BITS_TYPE_MASK;
+ bits |= MACH_PORT_TYPE_DEAD_NAME;
+ if (entry->ie_request) {
+ entry->ie_request = IE_REQ_NONE;
+ bits++;
+ }
+ entry->ie_bits = bits;
+ entry->ie_object = IO_NULL;
}
- entry->ie_bits = bits;
- entry->ie_object = IO_NULL;
} else {
assert(IE_BITS_TYPE(bits) == MACH_PORT_TYPE_RECEIVE);
assert(IE_BITS_UREFS(bits) == 0);
- dnrequest = ipc_right_dncancel_macro(space, port,
+ request = ipc_right_request_cancel_macro(space, port,
name, entry);
entry->ie_object = IO_NULL;
ipc_entry_dealloc(space, name, entry);
ipc_port_clear_receiver(port);
ipc_port_destroy(port); /* consumes ref, unlocks */
- if (dnrequest != IP_NULL)
- ipc_notify_port_deleted(dnrequest, name);
+ if (request != IP_NULL)
+ ipc_notify_port_deleted(request, name);
break;
}
case MACH_PORT_RIGHT_SEND_ONCE: {
- ipc_port_t port, dnrequest;
+ ipc_port_t port, request;
if ((bits & MACH_PORT_TYPE_SEND_ONCE) == 0)
goto invalid_right;
goto success;
}
- dnrequest = ipc_right_dncancel_macro(space, port, name, entry);
+ request = ipc_right_request_cancel_macro(space, port, name, entry);
ip_unlock(port);
entry->ie_object = IO_NULL;
ipc_notify_send_once(port);
- if (dnrequest != IP_NULL)
- ipc_notify_port_deleted(dnrequest, name);
+ if (request != IP_NULL)
+ ipc_notify_port_deleted(request, name);
break;
}
assert(IE_BITS_TYPE(bits) == MACH_PORT_TYPE_DEAD_NAME);
assert(IE_BITS_UREFS(bits) > 0);
assert(entry->ie_object == IO_NULL);
- assert(entry->ie_request == 0);
+ assert(entry->ie_request == IE_REQ_NONE);
urefs = IE_BITS_UREFS(bits);
if (MACH_PORT_UREFS_UNDERFLOW(urefs, delta))
case MACH_PORT_RIGHT_SEND: {
mach_port_urefs_t urefs;
ipc_port_t port;
- ipc_port_t dnrequest = IP_NULL;
+ ipc_port_t request = IP_NULL;
ipc_port_t nsrequest = IP_NULL;
mach_port_mscount_t mscount = 0;
assert(IE_BITS_TYPE(bits) ==
MACH_PORT_TYPE_SEND);
- dnrequest = ipc_right_dncancel_macro(space, port,
+ request = ipc_right_request_cancel_macro(space, port,
name, entry);
ipc_hash_delete(space, (ipc_object_t) port,
name, entry);
if (nsrequest != IP_NULL)
ipc_notify_no_senders(nsrequest, mscount);
- if (dnrequest != IP_NULL)
- ipc_notify_port_deleted(dnrequest, name);
+ if (request != IP_NULL)
+ ipc_notify_port_deleted(request, name);
break;
}
mach_port_type_t *typep,
mach_port_urefs_t *urefsp)
{
+ ipc_port_t port;
ipc_entry_bits_t bits;
- mach_port_type_t type;
+ mach_port_type_t type = 0;
ipc_port_request_index_t request;
bits = entry->ie_bits;
+ request = entry->ie_request;
+ port = (ipc_port_t) entry->ie_object;
- if (bits & MACH_PORT_TYPE_SEND_RIGHTS) {
- ipc_port_t port = (ipc_port_t) entry->ie_object;
+ if (bits & MACH_PORT_TYPE_RECEIVE) {
+ assert(IP_VALID(port));
- if (ipc_right_check(space, port, name, entry)) {
+ if (request != IE_REQ_NONE) {
+ ip_lock(port);
+ assert(ip_active(port));
+ type |= ipc_port_request_type(port, name, request);
+ ip_unlock(port);
+ }
+
+ } else if (bits & MACH_PORT_TYPE_SEND_RIGHTS) {
+ /*
+ * validate port is still alive - if so, get request
+ * types while we still have it locked. Otherwise,
+ * recapture the (now dead) bits.
+ */
+ if (!ipc_right_check(space, port, name, entry)) {
+ if (request != IE_REQ_NONE)
+ type |= ipc_port_request_type(port, name, request);
+ ip_unlock(port);
+ } else {
bits = entry->ie_bits;
assert(IE_BITS_TYPE(bits) == MACH_PORT_TYPE_DEAD_NAME);
- } else
- ip_unlock(port);
+ }
}
- type = IE_BITS_TYPE(bits);
- request = entry->ie_request;
-
- if (request != 0)
- type |= MACH_PORT_TYPE_DNREQUEST;
+ type |= IE_BITS_TYPE(bits);
*typep = type;
*urefsp = IE_BITS_UREFS(bits);
case MACH_MSG_TYPE_MOVE_RECEIVE: {
ipc_port_t port;
- ipc_port_t dnrequest = IP_NULL;
+ ipc_port_t request = IP_NULL;
if ((bits & MACH_PORT_TYPE_RECEIVE) == 0)
goto invalid_right;
assert(IE_BITS_TYPE(bits) == MACH_PORT_TYPE_RECEIVE);
assert(IE_BITS_UREFS(bits) == 0);
- dnrequest = ipc_right_dncancel_macro(space, port,
+ request = ipc_right_request_cancel_macro(space, port,
name, entry);
entry->ie_object = IO_NULL;
}
ip_unlock(port);
*objectp = (ipc_object_t) port;
- *sorightp = dnrequest;
+ *sorightp = request;
break;
}
case MACH_MSG_TYPE_MOVE_SEND: {
ipc_port_t port;
- ipc_port_t dnrequest = IP_NULL;
+ ipc_port_t request = IP_NULL;
if (bits & MACH_PORT_TYPE_DEAD_NAME)
goto move_dead;
assert(IE_BITS_TYPE(bits) ==
MACH_PORT_TYPE_SEND);
- dnrequest = ipc_right_dncancel_macro(space, port,
+ request = ipc_right_request_cancel_macro(space, port,
name, entry);
ipc_hash_delete(space, (ipc_object_t) port,
name, entry);
ip_unlock(port);
*objectp = (ipc_object_t) port;
- *sorightp = dnrequest;
+ *sorightp = request;
break;
}
case MACH_MSG_TYPE_MOVE_SEND_ONCE: {
ipc_port_t port;
- ipc_port_t dnrequest;
+ ipc_port_t request;
if (bits & MACH_PORT_TYPE_DEAD_NAME)
goto move_dead;
assert(IE_BITS_UREFS(bits) == 1);
assert(port->ip_sorights > 0);
- dnrequest = ipc_right_dncancel_macro(space, port, name, entry);
+ request = ipc_right_request_cancel_macro(space, port, name, entry);
ip_unlock(port);
entry->ie_object = IO_NULL;
(IE_BITS_UREFS_MASK | MACH_PORT_TYPE_SEND_ONCE);
*objectp = (ipc_object_t) port;
- *sorightp = dnrequest;
+ *sorightp = request;
break;
}
copy_dead:
assert(IE_BITS_TYPE(bits) == MACH_PORT_TYPE_DEAD_NAME);
assert(IE_BITS_UREFS(bits) > 0);
- assert(entry->ie_request == 0);
+ assert(entry->ie_request == IE_REQ_NONE);
assert(entry->ie_object == 0);
if (!deadok)
move_dead:
assert(IE_BITS_TYPE(bits) == MACH_PORT_TYPE_DEAD_NAME);
assert(IE_BITS_UREFS(bits) > 0);
- assert(entry->ie_request == 0);
+ assert(entry->ie_request == IE_REQ_NONE);
assert(entry->ie_object == 0);
if (!deadok)
ipc_entry_bits_t bits;
mach_port_urefs_t urefs;
ipc_port_t port;
- ipc_port_t dnrequest = IP_NULL;
+ ipc_port_t request = IP_NULL;
#if CONFIG_MACF_MACH
task_t self = current_task();
int rc;
} else {
assert(IE_BITS_TYPE(bits) == MACH_PORT_TYPE_SEND);
- dnrequest = ipc_right_dncancel_macro(space, port,
+ request = ipc_right_request_cancel_macro(space, port,
name, entry);
port->ip_srights++;
ip_unlock(port);
*objectp = (ipc_object_t) port;
- *sorightp = dnrequest;
+ *sorightp = request;
return KERN_SUCCESS;
invalid_right:
* Note IE_BITS_COMPAT implies ie_request != 0.
*/
- if (request != 0) {
+ if (request != IE_REQ_NONE) {
ipc_port_t port;
assert(bits & MACH_PORT_TYPE_PORT_RIGHTS);
assert(port != IP_NULL);
if (ipc_right_check(space, port, oname, oentry)) {
- request = 0;
+ request = IE_REQ_NONE;
object = IO_NULL;
bits = oentry->ie_bits;
assert(IE_BITS_TYPE(bits) == MACH_PORT_TYPE_DEAD_NAME);
- assert(oentry->ie_request == 0);
+ assert(oentry->ie_request == IE_REQ_NONE);
} else {
/* port is locked and active */
- ipc_port_dnrename(port, request, oname, nname);
+ ipc_port_request_rename(port, request, oname, nname);
ip_unlock(port);
- oentry->ie_request = 0;
+ oentry->ie_request = IE_REQ_NONE;
}
}
panic("ipc_right_rename: strange rights");
}
- assert(oentry->ie_request == 0);
+ assert(oentry->ie_request == IE_REQ_NONE);
oentry->ie_object = IO_NULL;
ipc_entry_dealloc(space, oname, oentry);
is_write_unlock(space);
projects / apple / xnu.git / blobdiff