+bool CheckerSide::handle_message(const char* buffer, ssize_t size)
+{
+ s_mc_message_t base_message;
+ xbt_assert(size >= (ssize_t)sizeof(base_message), "Broken message. Got only %ld bytes.", size);
+ memcpy(&base_message, buffer, sizeof(base_message));
+
+ switch (base_message.type) {
+ case MessageType::IGNORE_HEAP: {
+ if (remote_memory_ != nullptr) {
+ s_mc_message_ignore_heap_t message;
+ xbt_assert(size == sizeof(message), "Broken message");
+ memcpy(&message, buffer, sizeof(message));
+
+ IgnoredHeapRegion region;
+ region.block = message.block;
+ region.fragment = message.fragment;
+ region.address = message.address;
+ region.size = message.size;
+ get_remote_memory()->ignore_heap(region);
+ } else {
+ XBT_INFO("Ignoring a IGNORE_HEAP message because we don't need to introspect memory.");
+ }
+ break;
+ }
+
+ case MessageType::UNIGNORE_HEAP: {
+ if (remote_memory_ != nullptr) {
+ s_mc_message_ignore_memory_t message;
+ xbt_assert(size == sizeof(message), "Broken message");
+ memcpy(&message, buffer, sizeof(message));
+ get_remote_memory()->unignore_heap((void*)message.addr, message.size);
+ } else {
+ XBT_INFO("Ignoring an UNIGNORE_HEAP message because we don't need to introspect memory.");
+ }
+ break;
+ }
+
+ case MessageType::IGNORE_MEMORY: {
+ if (remote_memory_ != nullptr) {
+ s_mc_message_ignore_memory_t message;
+ xbt_assert(size == sizeof(message), "Broken message");
+ memcpy(&message, buffer, sizeof(message));
+ get_remote_memory()->ignore_region(message.addr, message.size);
+ } else {
+ XBT_INFO("Ignoring an IGNORE_MEMORY message because we don't need to introspect memory.");
+ }
+ break;
+ }
+
+ case MessageType::STACK_REGION: {
+ if (remote_memory_ != nullptr) {
+ s_mc_message_stack_region_t message;
+ xbt_assert(size == sizeof(message), "Broken message");
+ memcpy(&message, buffer, sizeof(message));
+ get_remote_memory()->stack_areas().push_back(message.stack_region);
+ } else {
+ XBT_INFO("Ignoring an STACK_REGION message because we don't need to introspect memory.");
+ }
+ break;
+ }
+
+ case MessageType::REGISTER_SYMBOL: {
+ s_mc_message_register_symbol_t message;
+ xbt_assert(size == sizeof(message), "Broken message");
+ memcpy(&message, buffer, sizeof(message));
+ xbt_assert(not message.callback, "Support for client-side function proposition is not implemented.");
+ XBT_DEBUG("Received symbol: %s", message.name.data());
+
+ LivenessChecker::automaton_register_symbol(*get_remote_memory(), message.name.data(), remote((int*)message.data));
+ break;
+ }
+
+ case MessageType::WAITING:
+ return false;
+
+ case MessageType::ASSERTION_FAILED:
+ Exploration::get_instance()->report_assertion_failure();
+ break;
+
+ default:
+ xbt_die("Unexpected message from the application");
+ }
+ return true;
+}
+
+void CheckerSide::wait_for_requests()
+{
+ XBT_DEBUG("Resume the application");
+ if (get_channel().send(MessageType::CONTINUE) != 0)
+ throw xbt::errno_error();
+ clear_memory_cache();
+
+ if (running())
+ dispatch_events();
+}
+
+void CheckerSide::clear_memory_cache()
+{
+ if (remote_memory_)
+ remote_memory_->clear_cache();
+}
+
+void CheckerSide::handle_dead_child(int status)
+{
+ // From PTRACE_O_TRACEEXIT:
+#ifdef __linux__
+ if (status >> 8 == (SIGTRAP | (PTRACE_EVENT_EXIT << 8))) {
+ unsigned long eventmsg;
+ xbt_assert(ptrace(PTRACE_GETEVENTMSG, pid_, 0, &eventmsg) != -1, "Could not get exit status");
+ status = static_cast<int>(eventmsg);
+ if (WIFSIGNALED(status)) {
+ this->terminate();
+ Exploration::get_instance()->report_crash(status);
+ }
+ }
+#endif
+
+ // We don't care about non-lethal signals, just reinject them:
+ if (WIFSTOPPED(status)) {
+ XBT_DEBUG("Stopped with signal %i", (int)WSTOPSIG(status));
+ errno = 0;
+#ifdef __linux__
+ ptrace(PTRACE_CONT, pid_, 0, WSTOPSIG(status));
+#elif defined BSD
+ ptrace(PT_CONTINUE, pid_, (caddr_t)1, WSTOPSIG(status));
+#endif
+ xbt_assert(errno == 0, "Could not PTRACE_CONT: %s", strerror(errno));
+ }
+
+ else if (WIFSIGNALED(status)) {
+ this->terminate();
+ Exploration::get_instance()->report_crash(status);
+ } else if (WIFEXITED(status)) {
+ XBT_DEBUG("Child process is over");
+ this->terminate();
+ }
+}
+
+void CheckerSide::handle_waitpid()
+{
+ XBT_DEBUG("Check for wait event");
+
+ if (child_checker_ == nullptr) { // Wait directly
+ int status;
+ pid_t pid;
+ while ((pid = waitpid(-1, &status, WNOHANG)) != 0) {
+ if (pid == -1) {
+ if (errno == ECHILD) { // No more children:
+ xbt_assert(not this->running(), "Inconsistent state");
+ break;
+ } else {
+ xbt_die("Could not wait for pid: %s", strerror(errno));
+ }
+ }
+
+ if (pid == get_pid())
+ handle_dead_child(status);
+ }
+
+ } else { // Ask our proxy to wait for us
+
+ s_mc_message_int_t request = {};
+ request.type = MessageType::WAIT_CHILD;
+ request.value = pid_;
+ xbt_assert(child_checker_->get_channel().send(request) == 0,
+ "Could not ask my child to waitpid its child for me: %s", strerror(errno));
+
+ s_mc_message_int_t answer;
+ ssize_t answer_size = child_checker_->get_channel().receive(answer);
+ xbt_assert(answer_size != -1, "Could not receive message");
+ xbt_assert(answer.type == MessageType::WAIT_CHILD_REPLY,
+ "The received message is not the WAIT_CHILD_REPLY I was expecting but of type %s",
+ to_c_str(answer.type));
+ xbt_assert(answer_size == sizeof answer, "Broken message (size=%zd; expected %zu)", answer_size, sizeof answer);
+ handle_dead_child(answer.value);
+ }
+}