- // 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], args);
- DIE_IMPOSSIBLE;
- }
-
- // Parent (model-checker):
- ::close(sockets[0]);
-
- checker_side_ = std::make_unique<simgrid::mc::CheckerSide>(sockets[1], pid);
-
- start();
-
- /* Take the initial snapshot */
- wait_for_requests();
- initial_snapshot_ = std::make_shared<simgrid::mc::Snapshot>(0, page_store_, checker_side_->get_remote_memory());
-}
-
-RemoteApp::~RemoteApp()
-{
- initial_snapshot_ = nullptr;
- shutdown();
-}
-void RemoteApp::start()
-{
- XBT_DEBUG("Waiting for the model-checked process");
- int status;
-
- // The model-checked process SIGSTOP itself to signal it's ready:
- const pid_t pid = checker_side_->get_pid();
-
- xbt_assert(waitpid(pid, &status, WAITPID_CHECKED_FLAGS) == pid && WIFSTOPPED(status) && WSTOPSIG(status) == SIGSTOP,
- "Could not wait model-checked process");
-
- errno = 0;
-#ifdef __linux__
- ptrace(PTRACE_SETOPTIONS, pid, nullptr, PTRACE_O_TRACEEXIT);
- ptrace(PTRACE_CONT, pid, 0, 0);
-#elif defined BSD
- ptrace(PT_CONTINUE, pid, (caddr_t)1, 0);
-#else
-#error "no ptrace equivalent coded for this platform"
-#endif
- xbt_assert(errno == 0,
- "Ptrace does not seem to be usable in your setup (errno: %d). "
- "If you run from within a docker, adding `--cap-add SYS_PTRACE` to the docker line may help. "
- "If it does not help, please report this bug.",
- errno);
-}
-void RemoteApp::restore_initial_state() const
-{
- this->initial_snapshot_->restore(checker_side_->get_remote_memory());