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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/message_loop/message_pump_kqueue.h"
#include <mach/mach.h>
#include <mach/message.h>
#include <utility>
#include "base/functional/bind.h"
#include "base/memory/ptr_util.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/scoped_refptr.h"
#include "base/run_loop.h"
#include "base/task/single_thread_task_executor.h"
#include "base/task/single_thread_task_runner.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace {
class MessagePumpKqueueTest : public testing::Test {
public:
MessagePumpKqueueTest()
: pump_(new MessagePumpKqueue()), executor_(WrapUnique(pump_.get())) {}
MessagePumpKqueue* pump() { return pump_; }
static void CreatePortPair(apple::ScopedMachReceiveRight* receive,
apple::ScopedMachSendRight* send) {
mach_port_options_t options{};
options.flags = MPO_INSERT_SEND_RIGHT;
apple::ScopedMachReceiveRight port;
kern_return_t kr = mach_port_construct(
mach_task_self(), &options, 0,
apple::ScopedMachReceiveRight::Receiver(*receive).get());
ASSERT_EQ(kr, KERN_SUCCESS);
*send = apple::ScopedMachSendRight(receive->get());
}
static mach_msg_return_t SendEmptyMessage(mach_port_t remote_port,
mach_msg_id_t msgid) {
mach_msg_empty_send_t message{};
message.header.msgh_bits = MACH_MSGH_BITS_REMOTE(MACH_MSG_TYPE_COPY_SEND);
message.header.msgh_size = sizeof(message);
message.header.msgh_remote_port = remote_port;
message.header.msgh_id = msgid;
return mach_msg_send(&message.header);
}
private:
raw_ptr<MessagePumpKqueue, DanglingUntriaged>
pump_; // Weak, owned by |executor_|.
SingleThreadTaskExecutor executor_;
};
class PortWatcher : public MessagePumpKqueue::MachPortWatcher {
public:
PortWatcher(RepeatingClosure callback) : callback_(std::move(callback)) {}
~PortWatcher() override {}
void OnMachMessageReceived(mach_port_t port) override {
mach_msg_empty_rcv_t message{};
kern_return_t kr = mach_msg(&message.header, MACH_RCV_MSG, 0,
sizeof(message), port, 0, MACH_PORT_NULL);
ASSERT_EQ(kr, KERN_SUCCESS);
messages_.push_back(message.header);
callback_.Run();
}
std::vector<mach_msg_header_t> messages_;
private:
RepeatingClosure callback_;
};
TEST_F(MessagePumpKqueueTest, MachPortBasicWatch) {
apple::ScopedMachReceiveRight port;
apple::ScopedMachSendRight send_right;
CreatePortPair(&port, &send_right);
mach_msg_id_t msgid = 'helo';
RunLoop run_loop;
PortWatcher watcher(run_loop.QuitClosure());
MessagePumpKqueue::MachPortWatchController controller(FROM_HERE);
SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, BindOnce(
[](mach_port_t port, mach_msg_id_t msgid, RunLoop* loop) {
mach_msg_return_t kr = SendEmptyMessage(port, msgid);
EXPECT_EQ(kr, KERN_SUCCESS);
if (kr != KERN_SUCCESS) {
loop->Quit();
}
},
port.get(), msgid, Unretained(&run_loop)));
pump()->WatchMachReceivePort(port.get(), &controller, &watcher);
run_loop.Run();
ASSERT_EQ(1u, watcher.messages_.size());
EXPECT_EQ(port.get(), watcher.messages_[0].msgh_local_port);
EXPECT_EQ(msgid, watcher.messages_[0].msgh_id);
}
TEST_F(MessagePumpKqueueTest, MachPortStopWatching) {
apple::ScopedMachReceiveRight port;
apple::ScopedMachSendRight send_right;
CreatePortPair(&port, &send_right);
RunLoop run_loop;
PortWatcher watcher(run_loop.QuitClosure());
MessagePumpKqueue::MachPortWatchController controller(FROM_HERE);
pump()->WatchMachReceivePort(port.get(), &controller, &watcher);
SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE,
BindOnce(
[](MessagePumpKqueue::MachPortWatchController* controller) {
controller->StopWatchingMachPort();
},
Unretained(&controller)));
SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, BindOnce(
[](mach_port_t port) {
EXPECT_EQ(KERN_SUCCESS, SendEmptyMessage(port, 100));
},
port.get()));
run_loop.RunUntilIdle();
EXPECT_EQ(0u, watcher.messages_.size());
}
TEST_F(MessagePumpKqueueTest, MultipleMachWatchers) {
apple::ScopedMachReceiveRight port1, port2;
apple::ScopedMachSendRight send_right1, send_right2;
CreatePortPair(&port1, &send_right1);
CreatePortPair(&port2, &send_right2);
RunLoop run_loop;
int port1_count = 0, port2_count = 0;
// Whenever port1 receives a message, it will send to port2.
// Whenever port2 receives a message, it will send to port1.
// When port2 has sent 3 messages to port1, it will stop.
PortWatcher watcher1(BindRepeating(
[](mach_port_t port2, int* port2_count, RunLoop* loop) {
mach_msg_id_t id = (0x2 << 16) | ++(*port2_count);
mach_msg_return_t kr = SendEmptyMessage(port2, id);
EXPECT_EQ(kr, KERN_SUCCESS);
if (kr != KERN_SUCCESS) {
loop->Quit();
}
},
port2.get(), &port2_count, &run_loop));
MessagePumpKqueue::MachPortWatchController controller1(FROM_HERE);
PortWatcher watcher2(BindRepeating(
[](mach_port_t port1, int* port1_count, RunLoop* loop) {
if (*port1_count == 3) {
loop->Quit();
return;
}
mach_msg_id_t id = (0x1 << 16) | ++(*port1_count);
mach_msg_return_t kr = SendEmptyMessage(port1, id);
EXPECT_EQ(kr, KERN_SUCCESS);
if (kr != KERN_SUCCESS) {
loop->Quit();
}
},
port1.get(), &port1_count, &run_loop));
MessagePumpKqueue::MachPortWatchController controller2(FROM_HERE);
pump()->WatchMachReceivePort(port1.get(), &controller1, &watcher1);
pump()->WatchMachReceivePort(port2.get(), &controller2, &watcher2);
// Start ping-ponging with by sending the first message to port1.
SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE, BindOnce(
[](mach_port_t port1) {
ASSERT_EQ(KERN_SUCCESS,
SendEmptyMessage(port1, 0xf000f));
},
port1.get()));
run_loop.Run();
ASSERT_EQ(4u, watcher1.messages_.size());
ASSERT_EQ(4u, watcher2.messages_.size());
EXPECT_EQ(0xf000f, watcher1.messages_[0].msgh_id);
EXPECT_EQ(0x10001, watcher1.messages_[1].msgh_id);
EXPECT_EQ(0x10002, watcher1.messages_[2].msgh_id);
EXPECT_EQ(0x10003, watcher1.messages_[3].msgh_id);
EXPECT_EQ(0x20001, watcher2.messages_[0].msgh_id);
EXPECT_EQ(0x20002, watcher2.messages_[1].msgh_id);
EXPECT_EQ(0x20003, watcher2.messages_[2].msgh_id);
EXPECT_EQ(0x20004, watcher2.messages_[3].msgh_id);
}
} // namespace
} // namespace base
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