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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/port.h
- * Author: Rich Draves
- * Date: 1989
- *
- * Implementation specific complement to mach/port.h.
- */
- #ifndef _IPC_PORT_H_
- #define _IPC_PORT_H_
- #include <mach/port.h>
- /*
- * mach_port_t must be an unsigned type. Port values
- * have two parts, a generation number and an index.
- * These macros encapsulate all knowledge of how
- * a mach_port_t is laid out.
- *
- * If the size of generation numbers changes,
- * be sure to update IE_BITS_GEN_MASK and friends
- * in ipc/ipc_entry.h.
- */
- #if PORT_GENERATIONS
- #define MACH_PORT_INDEX(name) ((name) >> 8)
- #define MACH_PORT_GEN(name) (((name) & 0xff) << 24)
- #define MACH_PORT_MAKE(index, gen) (((index) << 8) | ((gen) >> 24))
- #else
- #define MACH_PORT_INDEX(name) (name)
- #define MACH_PORT_GEN(name) 0
- #define MACH_PORT_MAKE(index, gen) (index)
- #endif
- #define MACH_PORT_NGEN(name) MACH_PORT_MAKE(0, MACH_PORT_GEN(name))
- #define MACH_PORT_MAKEB(index, bits) MACH_PORT_MAKE(index, IE_BITS_GEN(bits))
- /*
- * Typedefs for code cleanliness. These must all have
- * the same (unsigned) type as mach_port_t.
- */
- typedef mach_port_t mach_port_index_t; /* index values */
- typedef mach_port_t mach_port_gen_t; /* generation numbers */
- #define MACH_PORT_UREFS_MAX ((mach_port_urefs_t) ((1 << 16) - 1))
- #define MACH_PORT_UREFS_OVERFLOW(urefs, delta) \
- (((delta) > 0) && \
- ((((urefs) + (delta)) <= (urefs)) || \
- (((urefs) + (delta)) > MACH_PORT_UREFS_MAX)))
- #define MACH_PORT_UREFS_UNDERFLOW(urefs, delta) \
- (((delta) < 0) && (-(delta) > (urefs)))
- #endif /* _IPC_PORT_H_ */
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