+++ /dev/null
-/*
- * @OSF_COPYRIGHT@
- */
-
-/*
- * 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.
- */
-
-#include <mach/mach.h>
-#include <mach/message.h>
-#include <mach/mach_init.h>
-
-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:
- * mach_msg_destroy is useful in two contexts.
- *
- * First, it can deallocate all port rights and
- * out-of-line memory in a received message.
- * When a server receives a request it doesn't want,
- * it needs this functionality.
- *
- * Second, it can mimic the side-effects of a msg-send
- * operation. The effect is as if the message were sent
- * and then destroyed inside the kernel. When a server
- * can't send a reply (because the client died),
- * it needs this functionality.
- */
-void
-mach_msg_destroy(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) {
- 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;
- }
- }
- }
- }
-}
-
-static void
-mach_msg_destroy_port(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(vm_offset_t addr, vm_size_t size)
-{
- if (size != 0)
- (void) vm_deallocate(mach_task_self(), addr, size);
-}
projects / apple / libc.git / blobdiff