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/*
* Mach Operating System
* Copyright (c) 1991,1990,1989 Carnegie Mellon University
* 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 ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS 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_object.h
* Author: Rich Draves
* Date: 1989
*
* Definitions for IPC objects, for which tasks have capabilities.
*/
#ifndef _IPC_IPC_OBJECT_H_
#define _IPC_IPC_OBJECT_H_
#include <mach/kern_return.h>
#include <mach/message.h>
#include <ipc/ipc_types.h>
#include <kern/lock.h>
#include <kern/macros.h>
#include <kern/slab.h>
typedef unsigned int ipc_object_refs_t;
typedef unsigned int ipc_object_bits_t;
typedef unsigned int ipc_object_type_t;
typedef struct ipc_object {
decl_simple_lock_data(,io_lock_data)
ipc_object_refs_t io_references;
ipc_object_bits_t io_bits;
} *ipc_object_t;
#define IO_NULL ((ipc_object_t) 0)
#define IO_DEAD ((ipc_object_t) -1)
#define IO_VALID(io) (((io) != IO_NULL) && ((io) != IO_DEAD))
#define IO_BITS_KOTYPE 0x0000ffff /* used by the object */
#define IO_BITS_OTYPE 0x3fff0000 /* determines a cache */
/* The following masks are used to store attributes of ipc ports. */
#define IO_BITS_PROTECTED_PAYLOAD 0x40000000 /* pp set? */
#define IO_BITS_ACTIVE 0x80000000U /* is object alive? */
#define io_active(io) ((int)(io)->io_bits < 0) /* hack */
#define io_otype(io) (((io)->io_bits & IO_BITS_OTYPE) >> 16)
#define io_kotype(io) ((io)->io_bits & IO_BITS_KOTYPE)
#define io_makebits(active, otype, kotype) \
(((active) ? IO_BITS_ACTIVE : 0) | ((otype) << 16) | (kotype))
/*
* Object types: ports, port sets, kernel-loaded ports
*/
#define IOT_PORT 0
#define IOT_PORT_SET 1
#define IOT_NUMBER 2 /* number of types used */
extern struct kmem_cache ipc_object_caches[IOT_NUMBER];
#define io_alloc(otype) \
((ipc_object_t) kmem_cache_alloc(&ipc_object_caches[(otype)]))
#define io_free(otype, io) \
kmem_cache_free(&ipc_object_caches[(otype)], (vm_offset_t) (io))
#define io_lock_init(io) simple_lock_init(&(io)->io_lock_data)
#define io_lock(io) simple_lock(&(io)->io_lock_data)
#define io_lock_try(io) simple_lock_try(&(io)->io_lock_data)
#define io_unlock(io) simple_unlock(&(io)->io_lock_data)
#define io_check_unlock(io) \
MACRO_BEGIN \
ipc_object_refs_t _refs = (io)->io_references; \
\
io_unlock(io); \
if (_refs == 0) \
io_free(io_otype(io), io); \
MACRO_END
#define io_reference(io) \
MACRO_BEGIN \
(io)->io_references++; \
MACRO_END
#define io_release(io) \
MACRO_BEGIN \
(io)->io_references--; \
MACRO_END
extern void
ipc_object_reference(ipc_object_t);
extern void
ipc_object_release(ipc_object_t);
extern kern_return_t
ipc_object_translate(ipc_space_t, mach_port_t,
mach_port_right_t, ipc_object_t *);
extern kern_return_t
ipc_object_alloc_dead(ipc_space_t, mach_port_t *);
extern kern_return_t
ipc_object_alloc_dead_name(ipc_space_t, mach_port_t);
extern kern_return_t
ipc_object_alloc(ipc_space_t, ipc_object_type_t,
mach_port_type_t, mach_port_urefs_t,
mach_port_t *, ipc_object_t *);
extern kern_return_t
ipc_object_alloc_name(ipc_space_t, ipc_object_type_t,
mach_port_type_t, mach_port_urefs_t,
mach_port_t, ipc_object_t *);
extern mach_msg_type_name_t
ipc_object_copyin_type(mach_msg_type_name_t);
extern kern_return_t
ipc_object_copyin(ipc_space_t, mach_port_t,
mach_msg_type_name_t, ipc_object_t *);
extern void
ipc_object_copyin_from_kernel(ipc_object_t, mach_msg_type_name_t);
extern void
ipc_object_destroy(ipc_object_t, mach_msg_type_name_t);
extern kern_return_t
ipc_object_copyout(ipc_space_t, ipc_object_t,
mach_msg_type_name_t, boolean_t, mach_port_t *);
extern kern_return_t
ipc_object_copyout_name(ipc_space_t, ipc_object_t,
mach_msg_type_name_t, boolean_t, mach_port_t);
extern void
ipc_object_copyout_dest(ipc_space_t, ipc_object_t,
mach_msg_type_name_t, mach_port_t *);
extern kern_return_t
ipc_object_rename(ipc_space_t, mach_port_t, mach_port_t);
extern void
ipc_object_print(ipc_object_t);
#endif /* _IPC_IPC_OBJECT_H_ */
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