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/*
* Mach Operating System
* Copyright (c) 1991,1990,1989 Carnegie Mellon University.
* Copyright (c) 1993,1994 The University of Utah and
* the Computer Systems Laboratory (CSL).
* All rights reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON, THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF
* THIS SOFTWARE IN ITS "AS IS" CONDITION, AND DISCLAIM ANY LIABILITY
* OF ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF
* THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
*/
/*
* File: ipc/ipc_space.c
* Author: Rich Draves
* Date: 1989
*
* Functions to manipulate IPC capability spaces.
*/
#include <string.h>
#include <mach/boolean.h>
#include <mach/kern_return.h>
#include <mach/port.h>
#include <kern/assert.h>
#include <kern/sched_prim.h>
#include <kern/slab.h>
#include <ipc/port.h>
#include <ipc/ipc_entry.h>
#include <ipc/ipc_table.h>
#include <ipc/ipc_port.h>
#include <ipc/ipc_space.h>
#include <ipc/ipc_right.h>
struct kmem_cache ipc_space_cache;
ipc_space_t ipc_space_kernel;
ipc_space_t ipc_space_reply;
/*
* Routine: ipc_space_reference
* Routine: ipc_space_release
* Purpose:
* Function versions of the IPC space macros.
* The "is_" cover macros can be defined to use the
* macros or the functions, as desired.
*/
void
ipc_space_reference(
ipc_space_t space)
{
ipc_space_reference_macro(space);
}
void
ipc_space_release(
ipc_space_t space)
{
ipc_space_release_macro(space);
}
/* A place-holder object for the zeroth entry. */
struct ipc_entry zero_entry;
/*
* Routine: ipc_space_create
* Purpose:
* Creates a new IPC space.
*
* The new space has two references, one for the caller
* and one because it is active.
* Conditions:
* Nothing locked. Allocates memory.
* Returns:
* KERN_SUCCESS Created a space.
* KERN_RESOURCE_SHORTAGE Couldn't allocate memory.
*/
kern_return_t
ipc_space_create(
ipc_table_size_t initial,
ipc_space_t *spacep)
{
ipc_space_t space;
space = is_alloc();
if (space == IS_NULL)
return KERN_RESOURCE_SHORTAGE;
is_ref_lock_init(space);
space->is_references = 2;
is_lock_init(space);
space->is_active = TRUE;
rdxtree_init(&space->is_map);
rdxtree_init(&space->is_reverse_map);
/* The zeroth entry is reserved. */
rdxtree_insert(&space->is_map, 0, &zero_entry);
space->is_size = 1;
space->is_free_list = NULL;
space->is_free_list_size = 0;
*spacep = space;
return KERN_SUCCESS;
}
/*
* Routine: ipc_space_create_special
* Purpose:
* Create a special space. A special space
* doesn't hold rights in the normal way.
* Instead it is place-holder for holding
* disembodied (naked) receive rights.
* See ipc_port_alloc_special/ipc_port_dealloc_special.
* Conditions:
* Nothing locked.
* Returns:
* KERN_SUCCESS Created a space.
* KERN_RESOURCE_SHORTAGE Couldn't allocate memory.
*/
kern_return_t
ipc_space_create_special(
ipc_space_t *spacep)
{
ipc_space_t space;
space = is_alloc();
if (space == IS_NULL)
return KERN_RESOURCE_SHORTAGE;
is_ref_lock_init(space);
space->is_references = 1;
is_lock_init(space);
space->is_active = FALSE;
*spacep = space;
return KERN_SUCCESS;
}
/*
* Routine: ipc_space_destroy
* Purpose:
* Marks the space as dead and cleans up the entries.
* Does nothing if the space is already dead.
* Conditions:
* Nothing locked.
*/
void
ipc_space_destroy(
ipc_space_t space)
{
boolean_t active;
assert(space != IS_NULL);
is_write_lock(space);
active = space->is_active;
space->is_active = FALSE;
is_write_unlock(space);
if (!active)
return;
ipc_entry_t entry;
struct rdxtree_iter iter;
rdxtree_for_each(&space->is_map, &iter, entry) {
if (entry->ie_name == MACH_PORT_NULL)
continue;
mach_port_type_t type = IE_BITS_TYPE(entry->ie_bits);
if (type != MACH_PORT_TYPE_NONE) {
mach_port_t name =
MACH_PORT_MAKEB(entry->ie_name, entry->ie_bits);
ipc_right_clean(space, name, entry);
}
ie_free(entry);
}
rdxtree_remove_all(&space->is_map);
rdxtree_remove_all(&space->is_reverse_map);
/*
* Because the space is now dead,
* we must release the "active" reference for it.
* Our caller still has his reference.
*/
is_release(space);
}
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