mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-10 11:54:40 +00:00
666 lines
21 KiB
Plaintext
666 lines
21 KiB
Plaintext
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
|
|
* vim: sw=2 ts=8 et :
|
|
*/
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include <map>
|
|
|
|
#include <mach/vm_map.h>
|
|
#include <mach/mach_port.h>
|
|
#if defined(XP_IOS)
|
|
#include <mach/vm_map.h>
|
|
#define mach_vm_address_t vm_address_t
|
|
#define mach_vm_allocate vm_allocate
|
|
#define mach_vm_deallocate vm_deallocate
|
|
#define mach_vm_map vm_map
|
|
#define mach_vm_read vm_read
|
|
#define mach_vm_region_recurse vm_region_recurse_64
|
|
#define mach_vm_size_t vm_size_t
|
|
#else
|
|
#include <mach/mach_vm.h>
|
|
#endif
|
|
#include <pthread.h>
|
|
#include <unistd.h>
|
|
#include "SharedMemoryBasic.h"
|
|
#include "chrome/common/mach_ipc_mac.h"
|
|
|
|
#include "mozilla/StaticMutex.h"
|
|
|
|
#ifdef DEBUG
|
|
#define LOG_ERROR(str, args...) \
|
|
PR_BEGIN_MACRO \
|
|
char *msg = PR_smprintf(str, ## args); \
|
|
NS_WARNING(msg); \
|
|
PR_smprintf_free(msg); \
|
|
PR_END_MACRO
|
|
#else
|
|
#define LOG_ERROR(str, args...) do { /* nothing */ } while(0)
|
|
#endif
|
|
|
|
#define CHECK_MACH_ERROR(kr, msg) \
|
|
PR_BEGIN_MACRO \
|
|
if (kr != KERN_SUCCESS) { \
|
|
LOG_ERROR("%s %s (%x)\n", msg, mach_error_string(kr), kr); \
|
|
return false; \
|
|
} \
|
|
PR_END_MACRO
|
|
|
|
/*
|
|
* This code is responsible for sharing memory between processes. Memory can be
|
|
* shared between parent and child or between two children. Each memory region is
|
|
* referenced via a Mach port. Mach ports are also used for messaging when
|
|
* sharing a memory region.
|
|
*
|
|
* When the parent starts a child, it starts a thread whose only purpose is to
|
|
* communicate with the child about shared memory. Once the child has started,
|
|
* it starts a similar thread for communicating with the parent. Each side can
|
|
* communicate with the thread on the other side via Mach ports. When either
|
|
* side wants to share memory with the other, it sends a Mach message to the
|
|
* other side. Attached to the message is the port that references the shared
|
|
* memory region. When the other side receives the message, it automatically
|
|
* gets access to the region. It sends a reply (also via a Mach port) so that
|
|
* the originating side can continue.
|
|
*
|
|
* The two sides communicate using four ports. Two ports are used when the
|
|
* parent shares memory with the child. The other two are used when the child
|
|
* shares memory with the parent. One of these two ports is used for sending the
|
|
* "share" message and the other is used for the reply.
|
|
*
|
|
* If a child wants to share memory with another child, it sends a "GetPorts"
|
|
* message to the parent. The parent forwards this GetPorts message to the
|
|
* target child. The message includes some ports so that the children can talk
|
|
* directly. Both children start up a thread to communicate with the other child,
|
|
* similar to the way parent and child communicate. In the future, when these
|
|
* two children want to communicate, they re-use the channels that were created.
|
|
*
|
|
* When a child shuts down, the parent notifies all other children. Those
|
|
* children then have the opportunity to shut down any threads they might have
|
|
* been using to communicate directly with that child.
|
|
*/
|
|
|
|
namespace mozilla {
|
|
namespace ipc {
|
|
|
|
struct MemoryPorts {
|
|
MachPortSender* mSender;
|
|
ReceivePort* mReceiver;
|
|
|
|
MemoryPorts() {}
|
|
MemoryPorts(MachPortSender* sender, ReceivePort* receiver)
|
|
: mSender(sender), mReceiver(receiver) {}
|
|
};
|
|
|
|
// Protects gMemoryCommPorts and gThreads.
|
|
static StaticMutex gMutex;
|
|
|
|
static std::map<pid_t, MemoryPorts> gMemoryCommPorts;
|
|
|
|
enum {
|
|
kGetPortsMsg = 1,
|
|
kSharePortsMsg,
|
|
kReturnIdMsg,
|
|
kReturnPortsMsg,
|
|
kShutdownMsg,
|
|
kCleanupMsg,
|
|
};
|
|
|
|
const int kTimeout = 1000;
|
|
|
|
pid_t gParentPid = 0;
|
|
|
|
struct PIDPair {
|
|
pid_t mRequester;
|
|
pid_t mRequested;
|
|
|
|
PIDPair(pid_t requester, pid_t requested)
|
|
: mRequester(requester), mRequested(requested) {}
|
|
};
|
|
|
|
struct ListeningThread {
|
|
pthread_t mThread;
|
|
MemoryPorts* mPorts;
|
|
|
|
ListeningThread() {}
|
|
ListeningThread(pthread_t thread, MemoryPorts* ports)
|
|
: mThread(thread), mPorts(ports) {}
|
|
};
|
|
|
|
struct SharePortsReply {
|
|
uint64_t serial;
|
|
mach_port_t port;
|
|
};
|
|
|
|
std::map<pid_t, ListeningThread> gThreads;
|
|
|
|
static void *
|
|
PortServerThread(void *argument);
|
|
|
|
|
|
static void
|
|
SetupMachMemory(pid_t pid,
|
|
ReceivePort* listen_port,
|
|
MachPortSender* listen_port_ack,
|
|
MachPortSender* send_port,
|
|
ReceivePort* send_port_ack,
|
|
bool pidIsParent)
|
|
{
|
|
if (pidIsParent) {
|
|
gParentPid = pid;
|
|
}
|
|
MemoryPorts* listen_ports = new MemoryPorts(listen_port_ack, listen_port);
|
|
pthread_t thread;
|
|
pthread_attr_t attr;
|
|
pthread_attr_init(&attr);
|
|
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
|
|
int err = pthread_create(&thread, &attr, PortServerThread, listen_ports);
|
|
if (err) {
|
|
LOG_ERROR("pthread_create failed with %x\n", err);
|
|
return;
|
|
}
|
|
|
|
gMutex.AssertCurrentThreadOwns();
|
|
gThreads[pid] = ListeningThread(thread, listen_ports);
|
|
gMemoryCommPorts[pid] = MemoryPorts(send_port, send_port_ack);
|
|
}
|
|
|
|
// Send two communication ports to another process along with the pid of the process that is
|
|
// listening on them.
|
|
bool
|
|
SendPortsMessage(MachPortSender* sender,
|
|
mach_port_t ports_in_receiver,
|
|
mach_port_t ports_out_receiver,
|
|
PIDPair pid_pair)
|
|
{
|
|
MachSendMessage getPortsMsg(kGetPortsMsg);
|
|
if (!getPortsMsg.AddDescriptor(MachMsgPortDescriptor(ports_in_receiver))) {
|
|
LOG_ERROR("Adding descriptor to message failed");
|
|
return false;
|
|
}
|
|
if (!getPortsMsg.AddDescriptor(MachMsgPortDescriptor(ports_out_receiver))) {
|
|
LOG_ERROR("Adding descriptor to message failed");
|
|
return false;
|
|
}
|
|
|
|
getPortsMsg.SetData(&pid_pair, sizeof(PIDPair));
|
|
kern_return_t err = sender->SendMessage(getPortsMsg, kTimeout);
|
|
if (KERN_SUCCESS != err) {
|
|
LOG_ERROR("Error sending get ports message %s (%x)\n", mach_error_string(err), err);
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// Receive two communication ports from another process
|
|
bool
|
|
RecvPortsMessage(ReceivePort* receiver, mach_port_t* ports_in_sender, mach_port_t* ports_out_sender)
|
|
{
|
|
MachReceiveMessage rcvPortsMsg;
|
|
kern_return_t err = receiver->WaitForMessage(&rcvPortsMsg, kTimeout);
|
|
if (KERN_SUCCESS != err) {
|
|
LOG_ERROR("Error receiving get ports message %s (%x)\n", mach_error_string(err), err);
|
|
}
|
|
if (rcvPortsMsg.GetTranslatedPort(0) == MACH_PORT_NULL) {
|
|
LOG_ERROR("GetTranslatedPort(0) failed");
|
|
return false;
|
|
}
|
|
*ports_in_sender = rcvPortsMsg.GetTranslatedPort(0);
|
|
|
|
if (rcvPortsMsg.GetTranslatedPort(1) == MACH_PORT_NULL) {
|
|
LOG_ERROR("GetTranslatedPort(1) failed");
|
|
return false;
|
|
}
|
|
*ports_out_sender = rcvPortsMsg.GetTranslatedPort(1);
|
|
return true;
|
|
}
|
|
|
|
// Send two communication ports to another process and receive two back
|
|
bool
|
|
RequestPorts(const MemoryPorts& request_ports,
|
|
mach_port_t ports_in_receiver,
|
|
mach_port_t* ports_in_sender,
|
|
mach_port_t* ports_out_sender,
|
|
mach_port_t ports_out_receiver,
|
|
PIDPair pid_pair)
|
|
{
|
|
if (!SendPortsMessage(request_ports.mSender, ports_in_receiver, ports_out_receiver, pid_pair)) {
|
|
return false;
|
|
}
|
|
return RecvPortsMessage(request_ports.mReceiver, ports_in_sender, ports_out_sender);
|
|
}
|
|
|
|
MemoryPorts*
|
|
GetMemoryPortsForPid(pid_t pid)
|
|
{
|
|
gMutex.AssertCurrentThreadOwns();
|
|
|
|
if (gMemoryCommPorts.find(pid) == gMemoryCommPorts.end()) {
|
|
// We don't have the ports open to communicate with that pid, so we're going to
|
|
// ask our parent process over IPC to set them up for us.
|
|
if (gParentPid == 0) {
|
|
// If we're the top level parent process, we have no parent to ask.
|
|
LOG_ERROR("request for ports for pid %d, but we're the chrome process\n", pid);
|
|
return nullptr;
|
|
}
|
|
const MemoryPorts& parent = gMemoryCommPorts[gParentPid];
|
|
|
|
// Create two receiving ports in this process to send to the parent. One will be used for
|
|
// for listening for incoming memory to be shared, the other for getting the Handle of
|
|
// memory we share to the other process.
|
|
ReceivePort* ports_in_receiver = new ReceivePort();
|
|
ReceivePort* ports_out_receiver = new ReceivePort();
|
|
mach_port_t raw_ports_in_sender, raw_ports_out_sender;
|
|
if (!RequestPorts(parent,
|
|
ports_in_receiver->GetPort(),
|
|
&raw_ports_in_sender,
|
|
&raw_ports_out_sender,
|
|
ports_out_receiver->GetPort(),
|
|
PIDPair(getpid(), pid))) {
|
|
LOG_ERROR("failed to request ports\n");
|
|
return nullptr;
|
|
}
|
|
// Our parent process sent us two ports, one is for sending new memory to, the other
|
|
// is for replying with the Handle when we receive new memory.
|
|
MachPortSender* ports_in_sender = new MachPortSender(raw_ports_in_sender);
|
|
MachPortSender* ports_out_sender = new MachPortSender(raw_ports_out_sender);
|
|
SetupMachMemory(pid,
|
|
ports_in_receiver,
|
|
ports_in_sender,
|
|
ports_out_sender,
|
|
ports_out_receiver,
|
|
false);
|
|
MOZ_ASSERT(gMemoryCommPorts.find(pid) != gMemoryCommPorts.end());
|
|
}
|
|
return &gMemoryCommPorts.at(pid);
|
|
}
|
|
|
|
// We just received a port representing a region of shared memory, reply to
|
|
// the process that set it with the mach_port_t that represents it in this process.
|
|
// That will be the Handle to be shared over normal IPC
|
|
void
|
|
HandleSharePortsMessage(MachReceiveMessage* rmsg, MemoryPorts* ports)
|
|
{
|
|
mach_port_t port = rmsg->GetTranslatedPort(0);
|
|
uint64_t* serial = reinterpret_cast<uint64_t*>(rmsg->GetData());
|
|
MachSendMessage msg(kReturnIdMsg);
|
|
// Construct the reply message, echoing the serial, and adding the port
|
|
SharePortsReply replydata;
|
|
replydata.port = port;
|
|
replydata.serial = *serial;
|
|
msg.SetData(&replydata, sizeof(SharePortsReply));
|
|
kern_return_t err = ports->mSender->SendMessage(msg, kTimeout);
|
|
if (KERN_SUCCESS != err) {
|
|
LOG_ERROR("SendMessage failed 0x%x %s\n", err, mach_error_string(err));
|
|
}
|
|
}
|
|
|
|
// We were asked by another process to get communications ports to some process. Return
|
|
// those ports via an IPC message.
|
|
bool
|
|
SendReturnPortsMsg(MachPortSender* sender,
|
|
mach_port_t raw_ports_in_sender,
|
|
mach_port_t raw_ports_out_sender)
|
|
{
|
|
MachSendMessage getPortsMsg(kReturnPortsMsg);
|
|
if (!getPortsMsg.AddDescriptor(MachMsgPortDescriptor(raw_ports_in_sender))) {
|
|
LOG_ERROR("Adding descriptor to message failed");
|
|
return false;
|
|
}
|
|
|
|
if (!getPortsMsg.AddDescriptor(MachMsgPortDescriptor(raw_ports_out_sender))) {
|
|
LOG_ERROR("Adding descriptor to message failed");
|
|
return false;
|
|
}
|
|
kern_return_t err = sender->SendMessage(getPortsMsg, kTimeout);
|
|
if (KERN_SUCCESS != err) {
|
|
LOG_ERROR("Error sending get ports message %s (%x)\n", mach_error_string(err), err);
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
// We were asked for communcations ports to a process that isn't us. Assuming that process
|
|
// is one of our children, forward that request on.
|
|
void
|
|
ForwardGetPortsMessage(MachReceiveMessage* rmsg, MemoryPorts* ports, PIDPair* pid_pair)
|
|
{
|
|
if (rmsg->GetTranslatedPort(0) == MACH_PORT_NULL) {
|
|
LOG_ERROR("GetTranslatedPort(0) failed");
|
|
return;
|
|
}
|
|
if (rmsg->GetTranslatedPort(1) == MACH_PORT_NULL) {
|
|
LOG_ERROR("GetTranslatedPort(1) failed");
|
|
return;
|
|
}
|
|
mach_port_t raw_ports_in_sender, raw_ports_out_sender;
|
|
MemoryPorts* requestedPorts = GetMemoryPortsForPid(pid_pair->mRequested);
|
|
if (!requestedPorts) {
|
|
LOG_ERROR("failed to find port for process\n");
|
|
return;
|
|
}
|
|
if (!RequestPorts(*requestedPorts, rmsg->GetTranslatedPort(0), &raw_ports_in_sender,
|
|
&raw_ports_out_sender, rmsg->GetTranslatedPort(1), *pid_pair)) {
|
|
LOG_ERROR("failed to request ports\n");
|
|
return;
|
|
}
|
|
SendReturnPortsMsg(ports->mSender, raw_ports_in_sender, raw_ports_out_sender);
|
|
}
|
|
|
|
// We receieved a message asking us to get communications ports for another process
|
|
void
|
|
HandleGetPortsMessage(MachReceiveMessage* rmsg, MemoryPorts* ports)
|
|
{
|
|
PIDPair* pid_pair;
|
|
if (rmsg->GetDataLength() != sizeof(PIDPair)) {
|
|
LOG_ERROR("Improperly formatted message\n");
|
|
return;
|
|
}
|
|
pid_pair = reinterpret_cast<PIDPair*>(rmsg->GetData());
|
|
if (pid_pair->mRequested != getpid()) {
|
|
// This request is for ports to a process that isn't us, forward it to that process
|
|
ForwardGetPortsMessage(rmsg, ports, pid_pair);
|
|
} else {
|
|
if (rmsg->GetTranslatedPort(0) == MACH_PORT_NULL) {
|
|
LOG_ERROR("GetTranslatedPort(0) failed");
|
|
return;
|
|
}
|
|
|
|
if (rmsg->GetTranslatedPort(1) == MACH_PORT_NULL) {
|
|
LOG_ERROR("GetTranslatedPort(1) failed");
|
|
return;
|
|
}
|
|
|
|
MachPortSender* ports_in_sender = new MachPortSender(rmsg->GetTranslatedPort(0));
|
|
MachPortSender* ports_out_sender = new MachPortSender(rmsg->GetTranslatedPort(1));
|
|
|
|
ReceivePort* ports_in_receiver = new ReceivePort();
|
|
ReceivePort* ports_out_receiver = new ReceivePort();
|
|
if (SendReturnPortsMsg(ports->mSender, ports_in_receiver->GetPort(), ports_out_receiver->GetPort())) {
|
|
SetupMachMemory(pid_pair->mRequester,
|
|
ports_out_receiver,
|
|
ports_out_sender,
|
|
ports_in_sender,
|
|
ports_in_receiver,
|
|
false);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void *
|
|
PortServerThread(void *argument)
|
|
{
|
|
MemoryPorts* ports = static_cast<MemoryPorts*>(argument);
|
|
MachReceiveMessage child_message;
|
|
while (true) {
|
|
MachReceiveMessage rmsg;
|
|
kern_return_t err = ports->mReceiver->WaitForMessage(&rmsg, MACH_MSG_TIMEOUT_NONE);
|
|
if (err != KERN_SUCCESS) {
|
|
LOG_ERROR("Wait for message failed 0x%x %s\n", err, mach_error_string(err));
|
|
continue;
|
|
}
|
|
if (rmsg.GetMessageID() == kShutdownMsg) {
|
|
delete ports->mSender;
|
|
delete ports->mReceiver;
|
|
delete ports;
|
|
return nullptr;
|
|
}
|
|
StaticMutexAutoLock smal(gMutex);
|
|
switch (rmsg.GetMessageID()) {
|
|
case kSharePortsMsg:
|
|
HandleSharePortsMessage(&rmsg, ports);
|
|
break;
|
|
case kGetPortsMsg:
|
|
HandleGetPortsMessage(&rmsg, ports);
|
|
break;
|
|
case kCleanupMsg:
|
|
if (gParentPid == 0) {
|
|
LOG_ERROR("Cleanup message not valid for parent process");
|
|
continue;
|
|
}
|
|
|
|
pid_t* pid;
|
|
if (rmsg.GetDataLength() != sizeof(pid_t)) {
|
|
LOG_ERROR("Improperly formatted message\n");
|
|
continue;
|
|
}
|
|
pid = reinterpret_cast<pid_t*>(rmsg.GetData());
|
|
SharedMemoryBasic::CleanupForPid(*pid);
|
|
break;
|
|
default:
|
|
LOG_ERROR("Unknown message\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
SharedMemoryBasic::SetupMachMemory(pid_t pid,
|
|
ReceivePort* listen_port,
|
|
MachPortSender* listen_port_ack,
|
|
MachPortSender* send_port,
|
|
ReceivePort* send_port_ack,
|
|
bool pidIsParent)
|
|
{
|
|
StaticMutexAutoLock smal(gMutex);
|
|
mozilla::ipc::SetupMachMemory(pid, listen_port, listen_port_ack, send_port, send_port_ack, pidIsParent);
|
|
}
|
|
|
|
void
|
|
SharedMemoryBasic::Shutdown()
|
|
{
|
|
StaticMutexAutoLock smal(gMutex);
|
|
|
|
for (auto it = gThreads.begin(); it != gThreads.end(); ++it) {
|
|
MachSendMessage shutdownMsg(kShutdownMsg);
|
|
it->second.mPorts->mReceiver->SendMessageToSelf(shutdownMsg, kTimeout);
|
|
}
|
|
gThreads.clear();
|
|
|
|
for (auto it = gMemoryCommPorts.begin(); it != gMemoryCommPorts.end(); ++it) {
|
|
delete it->second.mSender;
|
|
delete it->second.mReceiver;
|
|
}
|
|
gMemoryCommPorts.clear();
|
|
}
|
|
|
|
void
|
|
SharedMemoryBasic::CleanupForPid(pid_t pid)
|
|
{
|
|
if (gThreads.find(pid) == gThreads.end()) {
|
|
return;
|
|
}
|
|
const ListeningThread& listeningThread = gThreads[pid];
|
|
MachSendMessage shutdownMsg(kShutdownMsg);
|
|
kern_return_t ret = listeningThread.mPorts->mReceiver->SendMessageToSelf(shutdownMsg, kTimeout);
|
|
if (ret != KERN_SUCCESS) {
|
|
LOG_ERROR("sending shutdown msg failed %s %x\n", mach_error_string(ret), ret);
|
|
}
|
|
gThreads.erase(pid);
|
|
|
|
if (gParentPid == 0) {
|
|
// We're the parent. Broadcast the cleanup message to everyone else.
|
|
for (auto it = gMemoryCommPorts.begin(); it != gMemoryCommPorts.end(); ++it) {
|
|
MachSendMessage msg(kCleanupMsg);
|
|
msg.SetData(&pid, sizeof(pid));
|
|
// We don't really care if this fails, we could be trying to send to an already shut down proc
|
|
it->second.mSender->SendMessage(msg, kTimeout);
|
|
}
|
|
}
|
|
|
|
MemoryPorts& ports = gMemoryCommPorts[pid];
|
|
delete ports.mSender;
|
|
delete ports.mReceiver;
|
|
gMemoryCommPorts.erase(pid);
|
|
}
|
|
|
|
SharedMemoryBasic::SharedMemoryBasic()
|
|
: mPort(MACH_PORT_NULL)
|
|
, mMemory(nullptr)
|
|
{
|
|
}
|
|
|
|
SharedMemoryBasic::SharedMemoryBasic(Handle aHandle)
|
|
: mPort(MACH_PORT_NULL)
|
|
, mMemory(nullptr)
|
|
{
|
|
mPort = aHandle;
|
|
}
|
|
|
|
SharedMemoryBasic::~SharedMemoryBasic()
|
|
{
|
|
Unmap();
|
|
Destroy();
|
|
}
|
|
|
|
static inline void*
|
|
toPointer(mach_vm_address_t address)
|
|
{
|
|
return reinterpret_cast<void*>(static_cast<uintptr_t>(address));
|
|
}
|
|
|
|
static inline mach_vm_address_t
|
|
toVMAddress(void* pointer)
|
|
{
|
|
return static_cast<mach_vm_address_t>(reinterpret_cast<uintptr_t>(pointer));
|
|
}
|
|
|
|
bool
|
|
SharedMemoryBasic::Create(size_t size)
|
|
{
|
|
mach_vm_address_t address;
|
|
|
|
kern_return_t kr = mach_vm_allocate(mach_task_self(), &address, round_page(size), VM_FLAGS_ANYWHERE);
|
|
if (kr != KERN_SUCCESS) {
|
|
LOG_ERROR("Failed to allocate mach_vm_allocate shared memory (%zu bytes). %s (%x)\n",
|
|
size, mach_error_string(kr), kr);
|
|
return false;
|
|
}
|
|
|
|
memory_object_size_t memoryObjectSize = round_page(size);
|
|
|
|
kr = mach_make_memory_entry_64(mach_task_self(),
|
|
&memoryObjectSize,
|
|
address,
|
|
VM_PROT_DEFAULT,
|
|
&mPort,
|
|
MACH_PORT_NULL);
|
|
if (kr != KERN_SUCCESS) {
|
|
LOG_ERROR("Failed to make memory entry (%zu bytes). %s (%x)\n",
|
|
size, mach_error_string(kr), kr);
|
|
return false;
|
|
}
|
|
|
|
mMemory = toPointer(address);
|
|
Mapped(size);
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
SharedMemoryBasic::Map(size_t size)
|
|
{
|
|
if (mMemory) {
|
|
return true;
|
|
}
|
|
|
|
if (MACH_PORT_NULL == mPort) {
|
|
return false;
|
|
}
|
|
|
|
kern_return_t kr;
|
|
mach_vm_address_t address = 0;
|
|
|
|
vm_prot_t vmProtection = VM_PROT_READ | VM_PROT_WRITE;
|
|
|
|
kr = mach_vm_map(mach_task_self(), &address, round_page(size), 0, VM_FLAGS_ANYWHERE,
|
|
mPort, 0, false, vmProtection, vmProtection, VM_INHERIT_NONE);
|
|
if (kr != KERN_SUCCESS) {
|
|
LOG_ERROR("Failed to map shared memory (%zu bytes) into %x, port %x. %s (%x)\n",
|
|
size, mach_task_self(), mPort, mach_error_string(kr), kr);
|
|
return false;
|
|
}
|
|
|
|
mMemory = toPointer(address);
|
|
Mapped(size);
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
SharedMemoryBasic::ShareToProcess(base::ProcessId pid,
|
|
Handle* aNewHandle)
|
|
{
|
|
if (pid == getpid()) {
|
|
*aNewHandle = mPort;
|
|
return mach_port_mod_refs(mach_task_self(), *aNewHandle, MACH_PORT_RIGHT_SEND, 1) == KERN_SUCCESS;
|
|
}
|
|
StaticMutexAutoLock smal(gMutex);
|
|
|
|
// Serially number the messages, to check whether
|
|
// the reply we get was meant for us.
|
|
static uint64_t serial = 0;
|
|
uint64_t my_serial = serial;
|
|
serial++;
|
|
|
|
MemoryPorts* ports = GetMemoryPortsForPid(pid);
|
|
if (!ports) {
|
|
LOG_ERROR("Unable to get ports for process.\n");
|
|
return false;
|
|
}
|
|
MachSendMessage smsg(kSharePortsMsg);
|
|
smsg.AddDescriptor(MachMsgPortDescriptor(mPort, MACH_MSG_TYPE_COPY_SEND));
|
|
smsg.SetData(&my_serial, sizeof(uint64_t));
|
|
kern_return_t err = ports->mSender->SendMessage(smsg, kTimeout);
|
|
if (err != KERN_SUCCESS) {
|
|
LOG_ERROR("sending port failed %s %x\n", mach_error_string(err), err);
|
|
return false;
|
|
}
|
|
MachReceiveMessage msg;
|
|
err = ports->mReceiver->WaitForMessage(&msg, kTimeout);
|
|
if (err != KERN_SUCCESS) {
|
|
LOG_ERROR("didn't get an id %s %x\n", mach_error_string(err), err);
|
|
return false;
|
|
}
|
|
if (msg.GetDataLength() != sizeof(SharePortsReply)) {
|
|
LOG_ERROR("Improperly formatted reply\n");
|
|
return false;
|
|
}
|
|
SharePortsReply* msg_data = reinterpret_cast<SharePortsReply*>(msg.GetData());
|
|
mach_port_t id = msg_data->port;
|
|
uint64_t serial_check = msg_data->serial;
|
|
if (serial_check != my_serial) {
|
|
LOG_ERROR("Serials do not match up: %d vs %d", serial_check, my_serial);
|
|
return false;
|
|
}
|
|
*aNewHandle = id;
|
|
return true;
|
|
}
|
|
|
|
void
|
|
SharedMemoryBasic::Unmap()
|
|
{
|
|
if (!mMemory) {
|
|
return;
|
|
}
|
|
vm_address_t address = toVMAddress(mMemory);
|
|
kern_return_t kr = vm_deallocate(mach_task_self(), address, round_page(mMappedSize));
|
|
if (kr != KERN_SUCCESS) {
|
|
LOG_ERROR("Failed to deallocate shared memory. %s (%x)\n", mach_error_string(kr), kr);
|
|
return;
|
|
}
|
|
mMemory = nullptr;
|
|
}
|
|
|
|
void
|
|
SharedMemoryBasic::Destroy()
|
|
{
|
|
mach_port_deallocate(mach_task_self(), mPort);
|
|
}
|
|
|
|
bool
|
|
SharedMemoryBasic::IsHandleValid(const Handle& aHandle)
|
|
{
|
|
return aHandle > 0;
|
|
}
|
|
|
|
} // namespace ipc
|
|
} // namespace mozilla
|