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/*
* Mach Operating System
* Copyright (c) 1991,1990 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.
*/
/*
* (pre-GNU) HISTORY
*
* Revision 2.4 91/05/14 17:53:15 mrt
* Correcting copyright
*
* Revision 2.3 91/02/14 14:17:43 mrt
* Added new Mach copyright
* [91/02/13 12:44:15 mrt]
*
* Revision 2.2 90/08/06 17:24:22 rpd
* Created.
*
*/
#if 1
#include <mach.h>
#else
/* This is what CMU did, but that fails to declare some used functions. */
#include <mach/port.h>
#include <mach/message.h>
#include <mach_init.h>
#endif
static void mach_msg_destroy_port(mach_port_t, mach_msg_type_name_t);
static void mach_msg_destroy_memory(vm_offset_t, vm_size_t);
/*
* Routine: mach_msg_destroy
* Purpose:
* Deallocates all port rights and out-of-line memory
* found in a received message.
*/
void
__mach_msg_destroy(msg)
mach_msg_header_t *msg;
{
mach_msg_bits_t mbits = msg->msgh_bits;
/*
* The msgh_local_port field doesn't hold a port right.
* The receive operation consumes the destination port right.
*/
mach_msg_destroy_port(msg->msgh_remote_port, MACH_MSGH_BITS_REMOTE(mbits));
if (mbits & MACH_MSGH_BITS_COMPLEX) {
#ifdef MACH_MSG_PORT_DESCRIPTOR
mach_msg_body_t *body;
mach_msg_descriptor_t *saddr, *eaddr;
body = (mach_msg_body_t *) (msg + 1);
saddr = (mach_msg_descriptor_t *)
((mach_msg_base_t *) msg + 1);
eaddr = saddr + body->msgh_descriptor_count;
for ( ; saddr < eaddr; saddr++) {
switch (saddr->type.type) {
case MACH_MSG_PORT_DESCRIPTOR: {
mach_msg_port_descriptor_t *dsc;
/*
* Destroy port rights carried in the message
*/
dsc = &saddr->port;
mach_msg_destroy_port(dsc->name, dsc->disposition);
break;
}
case MACH_MSG_OOL_DESCRIPTOR : {
mach_msg_ool_descriptor_t *dsc;
/*
* Destroy memory carried in the message
*/
dsc = &saddr->out_of_line;
if (dsc->deallocate) {
mach_msg_destroy_memory((vm_offset_t)dsc->address,
dsc->size);
}
break;
}
case MACH_MSG_OOL_PORTS_DESCRIPTOR : {
mach_port_t *ports;
mach_msg_ool_ports_descriptor_t *dsc;
mach_msg_type_number_t j;
/*
* Destroy port rights carried in the message
*/
dsc = &saddr->ool_ports;
ports = (mach_port_t *) dsc->address;
for (j = 0; j < dsc->count; j++, ports++) {
mach_msg_destroy_port(*ports, dsc->disposition);
}
/*
* Destroy memory carried in the message
*/
if (dsc->deallocate) {
mach_msg_destroy_memory((vm_offset_t)dsc->address,
dsc->count * sizeof(mach_port_t));
}
break;
}
}
}
#else
vm_offset_t saddr;
vm_offset_t eaddr;
saddr = (vm_offset_t) (msg + 1);
eaddr = (vm_offset_t) msg + msg->msgh_size;
while (saddr < eaddr) {
mach_msg_type_long_t *type;
mach_msg_type_name_t name;
mach_msg_type_size_t size;
mach_msg_type_number_t number;
boolean_t is_inline;
vm_size_t length;
vm_offset_t addr;
type = (mach_msg_type_long_t *) saddr;
is_inline = type->msgtl_header.msgt_inline;
if (type->msgtl_header.msgt_longform) {
name = type->msgtl_name;
size = type->msgtl_size;
number = type->msgtl_number;
saddr += sizeof(mach_msg_type_long_t);
} else {
name = type->msgtl_header.msgt_name;
size = type->msgtl_header.msgt_size;
number = type->msgtl_header.msgt_number;
saddr += sizeof(mach_msg_type_t);
}
/* calculate length of data in bytes, rounding up */
length = (((((number * size) + 7) >> 3) + sizeof (int) - 1)
&~ (sizeof (int) - 1));
addr = is_inline ? saddr : * (vm_offset_t *) saddr;
if (MACH_MSG_TYPE_PORT_ANY(name)) {
mach_port_t *ports = (mach_port_t *) addr;
mach_msg_type_number_t i;
for (i = 0; i < number; i++)
mach_msg_destroy_port(*ports++, name);
}
if (is_inline) {
/* inline data sizes round up to int boundaries */
saddr += length;
} else {
mach_msg_destroy_memory(addr, length);
saddr += sizeof(vm_offset_t);
}
}
#endif
}
}
weak_alias (__mach_msg_destroy, mach_msg_destroy)
static void
mach_msg_destroy_port(port, type)
mach_port_t port;
mach_msg_type_name_t type;
{
if (MACH_PORT_VALID(port)) switch (type) {
case MACH_MSG_TYPE_MOVE_SEND:
case MACH_MSG_TYPE_MOVE_SEND_ONCE:
/* destroy the send/send-once right */
(void) __mach_port_deallocate(mach_task_self(), port);
break;
case MACH_MSG_TYPE_MOVE_RECEIVE:
/* destroy the receive right */
(void) __mach_port_mod_refs(mach_task_self(), port,
MACH_PORT_RIGHT_RECEIVE, -1);
break;
case MACH_MSG_TYPE_MAKE_SEND:
/* create a send right and then destroy it */
(void) __mach_port_insert_right(mach_task_self(), port,
port, MACH_MSG_TYPE_MAKE_SEND);
(void) __mach_port_deallocate(mach_task_self(), port);
break;
case MACH_MSG_TYPE_MAKE_SEND_ONCE:
/* create a send-once right and then destroy it */
(void) __mach_port_extract_right(mach_task_self(), port,
MACH_MSG_TYPE_MAKE_SEND_ONCE,
&port, &type);
(void) __mach_port_deallocate(mach_task_self(), port);
break;
}
}
static void
mach_msg_destroy_memory(addr, size)
vm_offset_t addr;
vm_size_t size;
{
if (size > 0)
(void) __vm_deallocate(__mach_task_self(), addr, size);
}
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