kern_return_t
ipc_object_copyin(
ipc_space_t space,
mach_port_name_t name,
mach_msg_type_name_t msgt_name,
ipc_object_t *objectp)
{
ipc_entry_t entry;
ipc_port_t soright;
ipc_port_t release_port;
kern_return_t kr;
queue_head_t links_data;
queue_t links = &links_data;
wait_queue_link_t wql;
queue_init(links);
/*
* Could first try a read lock when doing
* MACH_MSG_TYPE_COPY_SEND, MACH_MSG_TYPE_MAKE_SEND,
* and MACH_MSG_TYPE_MAKE_SEND_ONCE.
*/
kr = ipc_right_lookup_write(space, name, &entry);
if (kr != KERN_SUCCESS)
return kr;
/* space is write-locked and active */
release_port = IP_NULL;
kr = ipc_right_copyin(space, name, entry,
msgt_name, TRUE,
objectp, &soright,
&release_port,
links);
if (IE_BITS_TYPE(entry->ie_bits) == MACH_PORT_TYPE_NONE)
ipc_entry_dealloc(space, name, entry);
is_write_unlock(space);
while(!queue_empty(links)) {
wql = (wait_queue_link_t) dequeue(links);
wait_queue_link_free(wql);
}
if (release_port != IP_NULL)
ip_release(release_port);
if ((kr == KERN_SUCCESS) && (soright != IP_NULL))
ipc_notify_port_deleted(soright, name);
return kr;
}
static int
filt_machportattach(
struct knote *kn)
{
mach_port_name_t name = (mach_port_name_t)kn->kn_kevent.ident;
wait_queue_link_t wql = wait_queue_link_allocate();
ipc_pset_t pset = IPS_NULL;
int result = ENOSYS;
kern_return_t kr;
kr = ipc_object_translate(current_space(), name,
MACH_PORT_RIGHT_PORT_SET,
(ipc_object_t *)&pset);
if (kr != KERN_SUCCESS) {
wait_queue_link_free(wql);
return (kr == KERN_INVALID_NAME ? ENOENT : ENOTSUP);
}
/* We've got a lock on pset */
/*
* Bind the portset wait queue directly to knote/kqueue.
* This allows us to just use wait_queue foo to effect a wakeup,
* rather than having to call knote() from the Mach code on each
* message.
*/
result = knote_link_wait_queue(kn, &pset->ips_messages.imq_wait_queue, wql);
if (result == 0) {
/* keep a reference for the knote */
kn->kn_ptr.p_pset = pset;
ips_reference(pset);
ips_unlock(pset);
return 0;
}
ips_unlock(pset);
wait_queue_link_free(wql);
return result;
}
static void
filt_machportdetach(
struct knote *kn)
{
ipc_pset_t pset = kn->kn_ptr.p_pset;
wait_queue_link_t wql = WAIT_QUEUE_LINK_NULL;
/*
* Unlink the portset wait queue from knote/kqueue,
* and release our reference on the portset.
*/
ips_lock(pset);
(void)knote_unlink_wait_queue(kn, &pset->ips_messages.imq_wait_queue, &wql);
kn->kn_ptr.p_pset = IPS_NULL;
ips_unlock(pset);
ips_release(pset);
if (wql != WAIT_QUEUE_LINK_NULL)
wait_queue_link_free(wql);
}
void
ipc_pset_destroy(
ipc_pset_t pset)
{
spl_t s;
queue_head_t link_data;
queue_t links = &link_data;
wait_queue_link_t wql;
queue_init(links);
assert(ips_active(pset));
pset->ips_object.io_bits &= ~IO_BITS_ACTIVE;
/*
* remove all the member message queues
*/
ipc_mqueue_remove_all(&pset->ips_messages, links);
/*
* Set all waiters on the portset running to
* discover the change.
*/
s = splsched();
imq_lock(&pset->ips_messages);
ipc_mqueue_changed(&pset->ips_messages);
imq_unlock(&pset->ips_messages);
splx(s);
ips_unlock(pset);
ips_release(pset); /* consume the ref our caller gave us */
while(!queue_empty(links)) {
wql = (wait_queue_link_t) dequeue(links);
wait_queue_link_free(wql);
}
}
