#include <sys/ptrace.h>
#include <sys/socket.h>
#include <sys/types.h>
+#include <sys/un.h>
+#include <sys/wait.h>
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_client, mc, "MC client logic");
XBT_LOG_EXTERNAL_CATEGORY(mc_global);
instance_ = std::make_unique<simgrid::mc::AppSide>(fd);
// Wait for the model-checker:
- errno = 0;
+ if (getenv("MC_NEED_PTRACE") != nullptr) {
+ errno = 0;
#if defined __linux__
- ptrace(PTRACE_TRACEME, 0, nullptr, nullptr);
+ ptrace(PTRACE_TRACEME, 0, nullptr, nullptr);
#elif defined BSD
- ptrace(PT_TRACE_ME, 0, nullptr, 0);
+ ptrace(PT_TRACE_ME, 0, nullptr, 0);
#else
-#error "no ptrace equivalent coded for this platform"
+ xbt_die("no ptrace equivalent coded for this platform, please don't use the liveness checker here.");
#endif
- xbt_assert(errno == 0 && raise(SIGSTOP) == 0, "Could not wait for the model-checker (errno = %d: %s)", errno,
- strerror(errno));
+
+ xbt_assert(errno == 0 && raise(SIGSTOP) == 0, "Could not wait for the model-checker (errno = %d: %s)", errno,
+ strerror(errno));
+ }
instance_->handle_messages();
return instance_.get();
// Finish the RPC from the server: return a serialized observer, to build a Transition on Checker side
s_mc_message_simcall_execute_answer_t answer = {};
- answer.type = MessageType::SIMCALL_EXECUTE_ANSWER;
+ answer.type = MessageType::SIMCALL_EXECUTE_REPLY;
std::stringstream stream;
if (actor->simcall_.observer_ != nullptr) {
actor->simcall_.observer_->serialize(stream);
if (terminate_asap)
::_Exit(0);
}
-void AppSide::handle_initial_addresses()
+void AppSide::handle_fork(const s_mc_message_int_t* msg)
+{
+ int pid = fork();
+ xbt_assert(pid >= 0, "Could not fork application sub-process: %s.", strerror(errno));
+
+ if (pid == 0) { // Child
+ int sock = socket(AF_LOCAL, SOCK_SEQPACKET | SOCK_CLOEXEC, 0);
+
+ struct sockaddr_un addr = {};
+ addr.sun_family = AF_LOCAL;
+ snprintf(addr.sun_path, 64, "/tmp/simgrid-mc-%lu", msg->value);
+ auto addr_size = offsetof(struct sockaddr_un, sun_path) + strlen(addr.sun_path);
+
+ xbt_assert(connect(sock, (struct sockaddr*)&addr, addr_size) >= 0,
+ "Cannot connect to Checker on /tmp/simgrid-mc-%lu: %s.", msg->value, strerror(errno));
+
+ channel_.reset_socket(sock);
+
+ s_mc_message_int_t answer = {};
+ answer.type = MessageType::FORK_REPLY;
+ answer.value = getpid();
+ xbt_assert(channel_.send(answer) == 0, "Could not send response to WAIT_CHILD_REPLY: %s", strerror(errno));
+ }
+}
+void AppSide::handle_wait_child(const s_mc_message_int_t* msg)
+{
+ int status;
+ errno = 0;
+ waitpid(msg->value, &status, 0);
+ xbt_assert(errno == 0, "Cannot wait on behalf of the checker: %s.", strerror(errno));
+
+ s_mc_message_int_t answer = {};
+ answer.type = MessageType::WAIT_CHILD_REPLY;
+ answer.value = status;
+ xbt_assert(channel_.send(answer) == 0, "Could not send response to WAIT_CHILD: %s", strerror(errno));
+}
+void AppSide::handle_need_meminfo()
{
- this->need_memory_info_ = true;
- s_mc_message_initial_addresses_reply_t answer = {};
- answer.type = MessageType::INITIAL_ADDRESSES_REPLY;
- answer.mmalloc_default_mdp = mmalloc_get_current_heap();
- xbt_assert(channel_.send(answer) == 0, "Could not send response with initial addresses.");
+ this->need_memory_info_ = true;
+ s_mc_message_need_meminfo_reply_t answer = {};
+ answer.type = MessageType::NEED_MEMINFO_REPLY;
+ answer.mmalloc_default_mdp = mmalloc_get_current_heap();
+ xbt_assert(channel_.send(answer) == 0, "Could not send response to the request for meminfo.");
}
void AppSide::handle_actors_status() const
{
auto const& actor_list = kernel::EngineImpl::get_instance()->get_actor_list();
- const int num_actors = actor_list.size();
- XBT_DEBUG("Serialize the actors to answer ACTORS_STATUS from the checker. %d actors to go.", num_actors);
-
- std::vector<s_mc_message_actors_status_one_t> status(num_actors);
- int i = 0;
- int total_transitions = 0;
+ XBT_DEBUG("Serialize the actors to answer ACTORS_STATUS from the checker. %zu actors to go.", actor_list.size());
+ std::vector<s_mc_message_actors_status_one_t> status;
for (auto const& [aid, actor] : actor_list) {
- status[i].aid = aid;
- status[i].enabled = mc::actor_is_enabled(actor);
- status[i].max_considered = actor->simcall_.observer_->get_max_consider();
- status[i].n_transitions = mc::actor_is_enabled(actor) ? status[i].max_considered : 0;
- total_transitions += status[i].n_transitions;
- i++;
+ s_mc_message_actors_status_one_t one = {};
+ one.type = MessageType::ACTORS_STATUS_REPLY_TRANSITION;
+ one.aid = aid;
+ one.enabled = mc::actor_is_enabled(actor);
+ one.max_considered = actor->simcall_.observer_->get_max_consider();
+ status.push_back(one);
}
struct s_mc_message_actors_status_answer_t answer = {};
- answer.type = MessageType::ACTORS_STATUS_REPLY;
- answer.count = num_actors;
- answer.transition_count = total_transitions;
+ answer.type = MessageType::ACTORS_STATUS_REPLY_COUNT;
+ answer.count = static_cast<int>(status.size());
xbt_assert(channel_.send(answer) == 0, "Could not send ACTORS_STATUS_REPLY msg");
if (answer.count > 0) {
}
// Serialize each transition to describe what each actor is doing
- if (total_transitions > 0) {
- std::vector<s_mc_message_simcall_probe_one_t> probes(total_transitions);
- auto probes_iter = probes.begin();
-
- for (const auto& actor_status : status) {
- if (not actor_status.enabled)
- continue;
-
- const auto& actor = actor_list.at(actor_status.aid);
- const int max_considered = actor_status.max_considered;
-
- for (int times_considered = 0; times_considered < max_considered; times_considered++, probes_iter++) {
- std::stringstream stream;
- s_mc_message_simcall_probe_one_t& probe = *probes_iter;
-
- if (actor->simcall_.observer_ != nullptr) {
- actor->simcall_.observer_->prepare(times_considered);
- actor->simcall_.observer_->serialize(stream);
- } else {
- stream << (short)mc::Transition::Type::UNKNOWN;
- }
-
- std::string str = stream.str();
- xbt_assert(str.size() + 1 <= probe.buffer.size(),
- "The serialized transition is too large for the buffer. Please fix the code.");
- strncpy(probe.buffer.data(), str.c_str(), probe.buffer.size() - 1);
- probe.buffer.back() = '\0';
+ XBT_DEBUG("Deliver ACTOR_TRANSITION_PROBE payload");
+ for (const auto& actor_status : status) {
+ if (not actor_status.enabled)
+ continue;
+
+ const auto& actor = actor_list.at(actor_status.aid);
+ const int max_considered = actor_status.max_considered;
+
+ for (int times_considered = 0; times_considered < max_considered; times_considered++) {
+ std::stringstream stream;
+ s_mc_message_simcall_probe_one_t probe;
+ probe.type = MessageType::ACTORS_STATUS_REPLY_SIMCALL;
+
+ if (actor->simcall_.observer_ != nullptr) {
+ actor->simcall_.observer_->prepare(times_considered);
+ actor->simcall_.observer_->serialize(stream);
+ } else {
+ stream << (short)mc::Transition::Type::UNKNOWN;
}
- // NOTE: We do NOT need to reset `times_considered` for each actor's
- // simcall observer here to the "original" value (i.e. the value BEFORE
- // multiple prepare() calls were made for serialization purposes) since
- // each SIMCALL_EXECUTE provides a `times_considered` to be used to prepare
- // the transition before execution.
- }
- XBT_DEBUG("Deliver ACTOR_TRANSITION_PROBE payload");
- for (const auto& probe : probes)
+ std::string str = stream.str();
+ xbt_assert(str.size() + 1 <= probe.buffer.size(),
+ "The serialized transition is too large for the buffer. Please fix the code.");
+ strncpy(probe.buffer.data(), str.c_str(), probe.buffer.size() - 1);
+ probe.buffer.back() = '\0';
+
xbt_assert(channel_.send(probe) == 0, "Could not send ACTOR_TRANSITION_PROBE payload");
+ }
+ // NOTE: We do NOT need to reset `times_considered` for each actor's
+ // simcall observer here to the "original" value (i.e. the value BEFORE
+ // multiple prepare() calls were made for serialization purposes) since
+ // each SIMCALL_EXECUTE provides a `times_considered` to be used to prepare
+ // the transition before execution.
}
}
void AppSide::handle_actors_maxpid() const
void AppSide::handle_messages()
{
while (true) { // Until we get a CONTINUE message
- XBT_DEBUG("Waiting messages from model-checker");
+ XBT_DEBUG("Waiting messages from the model-checker");
std::array<char, MC_MESSAGE_LENGTH> message_buffer;
ssize_t received_size = channel_.receive(message_buffer.data(), message_buffer.size());
const s_mc_message_t* message = (s_mc_message_t*)message_buffer.data();
switch (message->type) {
+ case MessageType::CONTINUE:
+ assert_msg_size("MESSAGE_CONTINUE", s_mc_message_t);
+ return;
+
case MessageType::DEADLOCK_CHECK:
assert_msg_size("DEADLOCK_CHECK", s_mc_message_t);
handle_deadlock_check(message);
break;
- case MessageType::CONTINUE:
- assert_msg_size("MESSAGE_CONTINUE", s_mc_message_t);
- return;
-
case MessageType::SIMCALL_EXECUTE:
assert_msg_size("SIMCALL_EXECUTE", s_mc_message_simcall_execute_t);
handle_simcall_execute((s_mc_message_simcall_execute_t*)message_buffer.data());
handle_finalize((s_mc_message_int_t*)message_buffer.data());
break;
- case MessageType::INITIAL_ADDRESSES:
- assert_msg_size("INITIAL_ADDRESSES", s_mc_message_t);
- handle_initial_addresses();
+ case MessageType::FORK:
+ assert_msg_size("FORK", s_mc_message_int_t);
+ handle_fork((s_mc_message_int_t*)message_buffer.data());
+ break;
+
+ case MessageType::WAIT_CHILD:
+ assert_msg_size("WAIT_CHILD", s_mc_message_int_t);
+ handle_wait_child((s_mc_message_int_t*)message_buffer.data());
+ break;
+
+ case MessageType::NEED_MEMINFO:
+ assert_msg_size("NEED_MEMINFO", s_mc_message_t);
+ handle_need_meminfo();
break;
case MessageType::ACTORS_STATUS:
