/*
* ipc_space_clean - remove all port references from an ipc space.
*
* In order to follow the traditional semantic, ipc_space_destroy
* will not destroy the entire port table of a shared space. Instead
* it will simply clear its own sub-space.
*/
void
ipc_space_clean(
ipc_space_t space)
{
ipc_entry_t table;
ipc_entry_num_t size;
mach_port_index_t index;
/*
* If somebody is trying to grow the table,
* we must wait until they finish and figure
* out the space died.
*/
retry:
is_write_lock(space);
while (is_growing(space))
is_write_sleep(space);
if (!is_active(space)) {
is_write_unlock(space);
return;
}
/*
* Now we can futz with it since we have the write lock.
*/
table = space->is_table;
size = space->is_table_size;
for (index = 0; index < size; index++) {
ipc_entry_t entry = &table[index];
mach_port_type_t type;
type = IE_BITS_TYPE(entry->ie_bits);
if (type != MACH_PORT_TYPE_NONE) {
mach_port_name_t name = MACH_PORT_MAKE(index,
IE_BITS_GEN(entry->ie_bits));
ipc_right_destroy(space, name, entry, FALSE, 0); /* unlocks space */
goto retry;
}
}
/*
* JMM - Now the table is cleaned out. We don't bother shrinking the
* size of the table at this point, but we probably should if it is
* really large.
*/
is_write_unlock(space);
}
kern_return_t
mach_port_destroy(
ipc_space_t space,
mach_port_name_t name)
{
ipc_entry_t entry;
kern_return_t kr;
if (space == IS_NULL)
return KERN_INVALID_TASK;
if (!MACH_PORT_VALID(name))
return KERN_SUCCESS;
kr = ipc_right_lookup_write(space, name, &entry);
if (kr != KERN_SUCCESS)
return kr;
/* space is write-locked and active */
kr = ipc_right_destroy(space, name, entry);
is_write_unlock(space);
return kr;
}
