+++ /dev/null
-/* Copyright (c) 2015-2021. The SimGrid Team. All rights reserved. */
-
-/* This program is free software; you can redistribute it and/or modify it
- * under the terms of the license (GNU LGPL) which comes with this package. */
-
-#include "src/mc/Session.hpp"
-#include "src/mc/checker/Checker.hpp"
-#include "src/mc/mc_config.hpp"
-#include "src/internal_config.h" // HAVE_SMPI
-#if HAVE_SMPI
-#include "smpi/smpi.h"
-#endif
-#include "src/mc/mc_private.hpp"
-#include "src/mc/mc_state.hpp"
-#include "xbt/log.h"
-#include "xbt/system_error.hpp"
-
-#include <array>
-#include <memory>
-#include <string>
-
-#include <fcntl.h>
-#ifdef __linux__
-#include <sys/prctl.h>
-#endif
-
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_Session, mc, "Model-checker session");
-
-namespace simgrid {
-namespace mc {
-
-template <class Code> void run_child_process(int socket, Code code)
-{
- /* On startup, simix_global_init() calls simgrid::mc::Client::initialize(), which checks whether the MC_ENV_SOCKET_FD
- * env variable is set. If so, MC mode is assumed, and the client is setup from its side
- */
-
-#ifdef __linux__
- // Make sure we do not outlive our parent
- sigset_t mask;
- sigemptyset (&mask);
- xbt_assert(sigprocmask(SIG_SETMASK, &mask, nullptr) >= 0, "Could not unblock signals");
- xbt_assert(prctl(PR_SET_PDEATHSIG, SIGHUP) == 0, "Could not PR_SET_PDEATHSIG");
-#endif
-
- // Remove CLOEXEC to pass the socket to the application
- int fdflags = fcntl(socket, F_GETFD, 0);
- xbt_assert(fdflags != -1 && fcntl(socket, F_SETFD, fdflags & ~FD_CLOEXEC) != -1,
- "Could not remove CLOEXEC for socket");
-
- // Disable lazy relocation in the model-checked process to prevent the application from
- // modifying its .got.plt during snapshot.
- setenv("LC_BIND_NOW", "1", 1);
-
- setenv(MC_ENV_SOCKET_FD, std::to_string(socket).c_str(), 1);
-
- code();
-}
-
-Session::Session(const std::function<void()>& code)
-{
-#if HAVE_SMPI
- smpi_init_options();//only performed once
- xbt_assert(smpi_cfg_privatization() != SmpiPrivStrategies::MMAP,
- "Please use the dlopen privatization schema when model-checking SMPI code");
-#endif
-
- // Create an AF_LOCAL socketpair used for exchanging messages
- // between the model-checker process (ourselves) and the model-checked
- // process:
- int sockets[2];
- xbt_assert(socketpair(AF_LOCAL, SOCK_SEQPACKET | SOCK_CLOEXEC, 0, sockets) != -1, "Could not create socketpair");
-
- pid_t pid = fork();
- xbt_assert(pid >= 0, "Could not fork model-checked process");
-
- if (pid == 0) { // Child
- ::close(sockets[1]);
- run_child_process(sockets[0], code);
- DIE_IMPOSSIBLE;
- }
-
- // Parent (model-checker):
- ::close(sockets[0]);
-
- xbt_assert(mc_model_checker == nullptr, "Did you manage to start the MC twice in this process?");
-
- auto process = std::make_unique<simgrid::mc::RemoteProcess>(pid);
- model_checker_ = std::make_unique<simgrid::mc::ModelChecker>(std::move(process), sockets[1]);
-
- mc_model_checker = model_checker_.get();
- model_checker_->start();
-}
-
-Session::~Session()
-{
- this->close();
-}
-
-/** The application must be stopped. */
-void Session::take_initial_snapshot()
-{
- xbt_assert(initial_snapshot_ == nullptr);
- model_checker_->wait_for_requests();
- initial_snapshot_ = std::make_shared<simgrid::mc::Snapshot>(0);
-}
-
-void Session::execute(Transition const& transition) const
-{
- model_checker_->handle_simcall(transition);
- model_checker_->wait_for_requests();
-}
-
-void Session::restore_initial_state() const
-{
- this->initial_snapshot_->restore(&model_checker_->get_remote_process());
-}
-
-void Session::log_state() const
-{
- model_checker_->getChecker()->log_state();
-
- if (not _sg_mc_dot_output_file.get().empty()) {
- fprintf(dot_output, "}\n");
- fclose(dot_output);
- }
- if (getenv("SIMGRID_MC_SYSTEM_STATISTICS")){
- int ret=system("free");
- if (ret != 0)
- XBT_WARN("Call to system(free) did not return 0, but %d", ret);
- }
-}
-
-void Session::close()
-{
- initial_snapshot_ = nullptr;
- if (model_checker_) {
- model_checker_->shutdown();
- model_checker_ = nullptr;
- mc_model_checker = nullptr;
- }
-}
-
-bool Session::actor_is_enabled(aid_t pid) const
-{
- s_mc_message_actor_enabled_t msg;
- memset(&msg, 0, sizeof msg);
- msg.type = simgrid::mc::MessageType::ACTOR_ENABLED;
- msg.aid = pid;
- model_checker_->channel().send(msg);
- std::array<char, MC_MESSAGE_LENGTH> buff;
- ssize_t received = model_checker_->channel().receive(buff.data(), buff.size(), true);
- xbt_assert(received == sizeof(s_mc_message_int_t), "Unexpected size in answer to ACTOR_ENABLED");
- return ((s_mc_message_int_t*)buff.data())->value;
-}
-
-simgrid::mc::Session* session_singleton;
-}
-}
