This is xnu-8019. See this file in:
/*
 * Copyright (c) 2019 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * @OSF_COPYRIGHT@
 */

/*
 * 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
 * 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 the
 * rights to redistribute these changes.
 */

/*
 *	File:	errorlib.h
 *	Author:	Douglas Orr, Carnegie Mellon University
 *	Date:	Mar. 1988
 *
 *	Error bases for subsytems errors.
 */

#include <stddef.h>

#include <mach/error.h>
#include <mach/boolean.h>

#define MACH_IPC_SEND_MOD       (err_mach_ipc|err_sub(0))
#define MACH_IPC_RCV_MOD        (err_mach_ipc|err_sub(1))
#define MACH_IPC_MIG_MOD        (err_mach_ipc|err_sub(2))

#define IPC_SEND_MOD            (err_ipc|err_sub(0))
#define IPC_RCV_MOD             (err_ipc|err_sub(1))
#define IPC_MIG_MOD             (err_ipc|err_sub(2))

#define SERV_NETNAME_MOD        (err_server|err_sub(0))
#define SERV_ENV_MOD            (err_server|err_sub(1))
#define SERV_EXECD_MOD          (err_server|err_sub(2))


#define NO_SUCH_ERROR           "unknown error code"

struct error_sparse_map {
	unsigned                start;
	unsigned                end;
};
#define err_sub_map_entry(start, end)  { err_get_sub(start),  err_get_sub(end) }
#define err_code_map_entry(start, end) { err_get_code(start), err_get_code(end) }

struct error_subsystem {
	const char                      *subsys_name;
	int                             max_code;
	const char * const              *codes;
	const struct error_sparse_map   *map_table;
	int                             map_count;
};
#define errorlib_system_null    { NULL, 0, NULL, NULL, 0 }

struct error_system {
	int                             max_sub;
	const char                      *bad_sub;
	const struct error_subsystem    *subsystem;
	const struct error_sparse_map   *map_table;
	int                             map_count;
};
#define errorlib_sub_null       { 0, NULL, NULL, NULL, 0 }

extern const struct error_system        _mach_errors[err_max_system + 1];
char *mach_error_string_int(mach_error_t, boolean_t *);

#define errlib_count(s)         (sizeof(s)/sizeof(s[0]))