1 /*
2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
11 *
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15 *
16 * Carnegie Mellon requests users of this software to return to
17 *
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
22 *
23 * any improvements or extensions that they make and grant Carnegie Mellon
24 * the rights to redistribute these changes.
25 */
26 /*
27 * (pre-GNU) HISTORY
28 *
29 * Revision 2.4 91/05/14 17:53:15 mrt
30 * Correcting copyright
31 *
32 * Revision 2.3 91/02/14 14:17:43 mrt
33 * Added new Mach copyright
34 * [91/02/13 12:44:15 mrt]
35 *
36 * Revision 2.2 90/08/06 17:24:22 rpd
37 * Created.
38 *
39 */
40
41 #include <libc-pointer-arith.h>
42 #if 1
43 #include <mach.h>
44 #else
45 /* This is what CMU did, but that fails to declare some used functions. */
46 #include <mach/port.h>
47 #include <mach/message.h>
48 #include <mach_init.h>
49 #endif
50
51 static void mach_msg_destroy_port(mach_port_t, mach_msg_type_name_t);
52 static void mach_msg_destroy_memory(vm_offset_t, vm_size_t);
53
54 /*
55 * Routine: mach_msg_destroy
56 * Purpose:
57 * Deallocates all port rights and out-of-line memory
58 * found in a received message.
59 */
60
61 void
62 __mach_msg_destroy (mach_msg_header_t *msg)
63 {
64 mach_msg_bits_t mbits = msg->msgh_bits;
65
66 /*
67 * The msgh_local_port field doesn't hold a port right.
68 * The receive operation consumes the destination port right.
69 */
70
71 mach_msg_destroy_port(msg->msgh_remote_port, MACH_MSGH_BITS_REMOTE(mbits));
72
73 if (mbits & MACH_MSGH_BITS_COMPLEX) {
74 #ifdef MACH_MSG_PORT_DESCRIPTOR
75 mach_msg_body_t *body;
76 mach_msg_descriptor_t *saddr, *eaddr;
77
78 body = (mach_msg_body_t *) (msg + 1);
79 saddr = (mach_msg_descriptor_t *)
80 ((mach_msg_base_t *) msg + 1);
81 eaddr = saddr + body->msgh_descriptor_count;
82
83 for ( ; saddr < eaddr; saddr++) {
84 switch (saddr->type.type) {
85
86 case MACH_MSG_PORT_DESCRIPTOR: {
87 mach_msg_port_descriptor_t *dsc;
88
89 /*
90 * Destroy port rights carried in the message
91 */
92 dsc = &saddr->port;
93 mach_msg_destroy_port(dsc->name, dsc->disposition);
94 break;
95 }
96
97 case MACH_MSG_OOL_DESCRIPTOR : {
98 mach_msg_ool_descriptor_t *dsc;
99
100 /*
101 * Destroy memory carried in the message
102 */
103 dsc = &saddr->out_of_line;
104 if (dsc->deallocate) {
105 mach_msg_destroy_memory((vm_offset_t)dsc->address,
106 dsc->size);
107 }
108 break;
109 }
110
111 case MACH_MSG_OOL_PORTS_DESCRIPTOR : {
112 mach_port_t *ports;
113 mach_msg_ool_ports_descriptor_t *dsc;
114 mach_msg_type_number_t j;
115
116 /*
117 * Destroy port rights carried in the message
118 */
119 dsc = &saddr->ool_ports;
120 ports = (mach_port_t *) dsc->address;
121 for (j = 0; j < dsc->count; j++, ports++) {
122 mach_msg_destroy_port(*ports, dsc->disposition);
123 }
124
125 /*
126 * Destroy memory carried in the message
127 */
128 if (dsc->deallocate) {
129 mach_msg_destroy_memory((vm_offset_t)dsc->address,
130 dsc->count * sizeof(mach_port_t));
131 }
132 break;
133 }
134 }
135 }
136 #else
137 vm_offset_t saddr;
138 vm_offset_t eaddr;
139
140 saddr = (vm_offset_t) (msg + 1);
141 eaddr = (vm_offset_t) msg + msg->msgh_size;
142
143 while (saddr < eaddr) {
144 mach_msg_type_long_t *type;
145 mach_msg_type_name_t name;
146 mach_msg_type_size_t size;
147 mach_msg_type_number_t number;
148 boolean_t is_inline;
149 vm_size_t length;
150 vm_offset_t addr;
151
152 type = (mach_msg_type_long_t *) saddr;
153 is_inline = type->msgtl_header.msgt_inline;
154 if (type->msgtl_header.msgt_longform) {
155 name = type->msgtl_name;
156 size = type->msgtl_size;
157 number = type->msgtl_number;
158 saddr += sizeof(mach_msg_type_long_t);
159 } else {
160 name = type->msgtl_header.msgt_name;
161 size = type->msgtl_header.msgt_size;
162 number = type->msgtl_header.msgt_number;
163 saddr += sizeof(mach_msg_type_t);
164 }
165
166 /* Calculate length of data in bytes... */
167 length = ((number * size) + 7) >> 3;
168 /* ... and round up using uintptr_t alignment */
169 length = ALIGN_UP (length, __alignof__ (uintptr_t));
170
171 addr = is_inline ? saddr : * (vm_offset_t *) saddr;
172
173 if (MACH_MSG_TYPE_PORT_ANY(name)) {
174 mach_port_t *ports = (mach_port_t *) addr;
175 mach_msg_type_number_t i;
176
177 for (i = 0; i < number; i++)
178 mach_msg_destroy_port(*ports++, name);
179 }
180
181 if (is_inline) {
182 saddr += length;
183 } else {
184 mach_msg_destroy_memory(addr, length);
185 saddr += sizeof(vm_offset_t);
186 }
187 }
188 #endif
189 }
190 }
191
192 weak_alias (__mach_msg_destroy, mach_msg_destroy)
193 libc_hidden_def (__mach_msg_destroy)
194
195 static void
196 mach_msg_destroy_port (mach_port_t port, mach_msg_type_name_t type)
197 {
198 if (MACH_PORT_VALID(port)) switch (type) {
199 case MACH_MSG_TYPE_MOVE_SEND:
200 case MACH_MSG_TYPE_MOVE_SEND_ONCE:
201 /* destroy the send/send-once right */
202 (void) __mach_port_deallocate(mach_task_self(), port);
203 break;
204
205 case MACH_MSG_TYPE_MOVE_RECEIVE:
206 /* destroy the receive right */
207 (void) __mach_port_mod_refs(mach_task_self(), port,
208 MACH_PORT_RIGHT_RECEIVE, -1);
209 break;
210
211 case MACH_MSG_TYPE_MAKE_SEND:
212 /* create a send right and then destroy it */
213 (void) __mach_port_insert_right(mach_task_self(), port,
214 port, MACH_MSG_TYPE_MAKE_SEND);
215 (void) __mach_port_deallocate(mach_task_self(), port);
216 break;
217
218 case MACH_MSG_TYPE_MAKE_SEND_ONCE:
219 /* create a send-once right and then destroy it */
220 (void) __mach_port_extract_right(mach_task_self(), port,
221 MACH_MSG_TYPE_MAKE_SEND_ONCE,
222 &port, &type);
223 (void) __mach_port_deallocate(mach_task_self(), port);
224 break;
225 }
226 }
227
228 static void
229 mach_msg_destroy_memory (vm_offset_t addr, vm_size_t size)
230 {
231 if (size > 0)
232 (void) __vm_deallocate(__mach_task_self(), addr, size);
233 }