+++ /dev/null
-/* Copyright (c) 2015-2018. 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 <csignal>
-#include <fcntl.h>
-
-#include <functional>
-
-#include "xbt/log.h"
-#include "xbt/system_error.hpp"
-#include <mc/mc.h>
-#include <simgrid/modelchecker.h>
-#include <simgrid/sg_config.hpp>
-
-#include "src/mc/Session.hpp"
-#include "src/mc/checker/Checker.hpp"
-#include "src/mc/mc_private.hpp"
-#include "src/mc/mc_state.hpp"
-
-#include "src/smpi/include/private.hpp"
-
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_Session, mc, "Model-checker session");
-
-namespace simgrid {
-namespace mc {
-
-static void setup_child_environment(int socket)
-{
-#ifdef __linux__
- // Make sure we do not outlive our parent:
- sigset_t mask;
- sigemptyset (&mask);
- if (sigprocmask(SIG_SETMASK, &mask, nullptr) < 0)
- throw simgrid::xbt::errno_error("Could not unblock signals");
- if (prctl(PR_SET_PDEATHSIG, SIGHUP) != 0)
- throw simgrid::xbt::errno_error("Could not PR_SET_PDEATHSIG");
-#endif
-
- int res;
-
- // Remove CLOEXEC in order to pass the socket to the exec-ed program:
- int fdflags = fcntl(socket, F_GETFD, 0);
- if (fdflags == -1 || fcntl(socket, F_SETFD, fdflags & ~FD_CLOEXEC) == -1)
- throw simgrid::xbt::errno_error("Could not remove CLOEXEC for socket");
-
- // Set environment:
- setenv(MC_ENV_VARIABLE, "1", 1);
-
- // Disable lazy relocation in the model-checked process.
- // We don't want the model-checked process to modify its .got.plt during
- // snapshot.
- setenv("LC_BIND_NOW", "1", 1);
-
- char buffer[64];
- res = std::snprintf(buffer, sizeof(buffer), "%i", socket);
- if ((size_t) res >= sizeof(buffer) || res == -1)
- std::abort();
- setenv(MC_ENV_SOCKET_FD, buffer, 1);
-}
-
-/** Execute some code in a forked process */
-template<class F>
-static inline
-pid_t do_fork(F code)
-{
- pid_t pid = fork();
- if (pid < 0)
- throw simgrid::xbt::errno_error("Could not fork model-checked process");
- if (pid != 0)
- return pid;
-
- // Child-process:
- try {
- code();
- _exit(EXIT_SUCCESS);
- }
- catch(...) {
- // The callback should catch exceptions:
- std::terminate();
- }
-}
-
-Session::Session(pid_t pid, int socket)
-{
- std::unique_ptr<simgrid::mc::RemoteClient> process(new simgrid::mc::RemoteClient(pid, socket));
- // TODO, automatic detection of the config from the process
- process->privatized(smpi_privatize_global_variables != SmpiPrivStrategies::None);
- modelChecker_ = std::unique_ptr<ModelChecker>(
- new simgrid::mc::ModelChecker(std::move(process)));
- xbt_assert(mc_model_checker == nullptr);
- mc_model_checker = modelChecker_.get();
- mc_model_checker->start();
-}
-
-Session::~Session()
-{
- this->close();
-}
-
-void Session::initialize()
-{
- xbt_assert(initialSnapshot_ == nullptr);
- mc_model_checker->wait_for_requests();
- initialSnapshot_ = simgrid::mc::take_snapshot(0);
-}
-
-void Session::execute(Transition const& transition)
-{
- modelChecker_->handle_simcall(transition);
- modelChecker_->wait_for_requests();
-}
-
-void Session::restoreInitialState()
-{
- simgrid::mc::restore_snapshot(this->initialSnapshot_);
-}
-
-void Session::logState()
-{
- mc_model_checker->getChecker()->logState();
-
- 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("system call did not return 0, but %d",ret);
- }
-}
-
-// static
-Session* Session::fork(std::function<void()> code)
-{
- // Create a AF_LOCAL socketpair used for exchanging messages
- // between the model-checker process (ourselves) and the model-checked
- // process:
- int res;
- int sockets[2];
- res = socketpair(AF_LOCAL, SOCK_SEQPACKET | SOCK_CLOEXEC, 0, sockets);
- if (res == -1)
- throw simgrid::xbt::errno_error("Could not create socketpair");
-
- pid_t pid = do_fork([sockets, &code] {
- ::close(sockets[1]);
- setup_child_environment(sockets[0]);
- code();
- xbt_die("The model-checked process failed to exec()");
- });
-
- // Parent (model-checker):
- ::close(sockets[0]);
-
- return new Session(pid, sockets[1]);
-}
-
-// static
-Session* Session::spawnv(const char *path, char *const argv[])
-{
- return Session::fork([path, argv] {
- execv(path, argv);
- });
-}
-
-// static
-Session* Session::spawnvp(const char *file, char *const argv[])
-{
- return Session::fork([file, argv] {
- execvp(file, argv);
- });
-}
-
-void Session::close()
-{
- initialSnapshot_ = nullptr;
- if (modelChecker_) {
- modelChecker_->shutdown();
- modelChecker_ = nullptr;
- mc_model_checker = nullptr;
- }
-}
-
-simgrid::mc::Session* session;
-
-}
-}
