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//===-- MainLoopTest.cpp --------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Host/MainLoop.h"
#include "TestingSupport/SubsystemRAII.h"
#include "lldb/Host/ConnectionFileDescriptor.h"
#include "lldb/Host/PseudoTerminal.h"
#include "lldb/Host/common/TCPSocket.h"
#include "llvm/Testing/Support/Error.h"
#include "gtest/gtest.h"
#include <future>
using namespace lldb_private;
namespace {
class MainLoopTest : public testing::Test {
public:
SubsystemRAII<Socket> subsystems;
void SetUp() override {
bool child_processes_inherit = false;
Status error;
std::unique_ptr<TCPSocket> listen_socket_up(
new TCPSocket(true, child_processes_inherit));
ASSERT_TRUE(error.Success());
error = listen_socket_up->Listen("localhost:0", 5);
ASSERT_TRUE(error.Success());
Socket *accept_socket;
std::future<Status> accept_error = std::async(std::launch::async, [&] {
return listen_socket_up->Accept(accept_socket);
});
std::unique_ptr<TCPSocket> connect_socket_up(
new TCPSocket(true, child_processes_inherit));
error = connect_socket_up->Connect(
llvm::formatv("localhost:{0}", listen_socket_up->GetLocalPortNumber())
.str());
ASSERT_TRUE(error.Success());
ASSERT_TRUE(accept_error.get().Success());
callback_count = 0;
socketpair[0] = std::move(connect_socket_up);
socketpair[1].reset(accept_socket);
}
void TearDown() override {
socketpair[0].reset();
socketpair[1].reset();
}
protected:
MainLoop::Callback make_callback() {
return [&](MainLoopBase &loop) {
++callback_count;
loop.RequestTermination();
};
}
std::shared_ptr<Socket> socketpair[2];
unsigned callback_count;
};
} // namespace
TEST_F(MainLoopTest, ReadObject) {
char X = 'X';
size_t len = sizeof(X);
ASSERT_TRUE(socketpair[0]->Write(&X, len).Success());
MainLoop loop;
Status error;
auto handle = loop.RegisterReadObject(socketpair[1], make_callback(), error);
ASSERT_TRUE(error.Success());
ASSERT_TRUE(handle);
ASSERT_TRUE(loop.Run().Success());
ASSERT_EQ(1u, callback_count);
}
TEST_F(MainLoopTest, TerminatesImmediately) {
char X = 'X';
size_t len = sizeof(X);
ASSERT_TRUE(socketpair[0]->Write(&X, len).Success());
ASSERT_TRUE(socketpair[1]->Write(&X, len).Success());
MainLoop loop;
Status error;
auto handle0 = loop.RegisterReadObject(socketpair[0], make_callback(), error);
ASSERT_TRUE(error.Success());
auto handle1 = loop.RegisterReadObject(socketpair[1], make_callback(), error);
ASSERT_TRUE(error.Success());
ASSERT_TRUE(loop.Run().Success());
ASSERT_EQ(1u, callback_count);
}
#ifdef LLVM_ON_UNIX
TEST_F(MainLoopTest, DetectsEOF) {
PseudoTerminal term;
ASSERT_TRUE(term.OpenFirstAvailablePrimary(O_RDWR, nullptr, 0));
ASSERT_TRUE(term.OpenSecondary(O_RDWR | O_NOCTTY, nullptr, 0));
auto conn = std::make_unique<ConnectionFileDescriptor>(
term.ReleasePrimaryFileDescriptor(), true);
Status error;
MainLoop loop;
auto handle =
loop.RegisterReadObject(conn->GetReadObject(), make_callback(), error);
ASSERT_TRUE(error.Success());
term.CloseSecondaryFileDescriptor();
ASSERT_TRUE(loop.Run().Success());
ASSERT_EQ(1u, callback_count);
}
TEST_F(MainLoopTest, Signal) {
MainLoop loop;
Status error;
auto handle = loop.RegisterSignal(SIGUSR1, make_callback(), error);
ASSERT_TRUE(error.Success());
kill(getpid(), SIGUSR1);
ASSERT_TRUE(loop.Run().Success());
ASSERT_EQ(1u, callback_count);
}
// Test that a signal which is not monitored by the MainLoop does not
// cause a premature exit.
TEST_F(MainLoopTest, UnmonitoredSignal) {
MainLoop loop;
Status error;
struct sigaction sa;
sa.sa_sigaction = [](int, siginfo_t *, void *) { };
sa.sa_flags = SA_SIGINFO; // important: no SA_RESTART
sigemptyset(&sa.sa_mask);
ASSERT_EQ(0, sigaction(SIGUSR2, &sa, nullptr));
auto handle = loop.RegisterSignal(SIGUSR1, make_callback(), error);
ASSERT_TRUE(error.Success());
std::thread killer([]() {
sleep(1);
kill(getpid(), SIGUSR2);
sleep(1);
kill(getpid(), SIGUSR1);
});
ASSERT_TRUE(loop.Run().Success());
killer.join();
ASSERT_EQ(1u, callback_count);
}
#endif
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