-/* Copyright (c) 2015-2019. The SimGrid Team. All rights reserved. */
+/* 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>
namespace simgrid {
namespace mc {
-static void setup_child_environment(int socket)
+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:
+ // 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 in order to pass the socket to the exec-ed program:
+ // 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");
- // 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.
+ // 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);
- char buffer[64];
- int res = std::snprintf(buffer, sizeof(buffer), "%i", socket);
- xbt_assert((size_t)res < sizeof(buffer) && res != -1);
- 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();
- xbt_assert(pid >= 0, "Could not fork model-checked process");
- if (pid != 0)
- return pid;
+ setenv(MC_ENV_SOCKET_FD, std::to_string(socket).c_str(), 1);
- // Child-process:
code();
- _exit(EXIT_SUCCESS);
}
Session::Session(const std::function<void()>& code)
{
#if HAVE_SMPI
- xbt_assert(smpi_privatize_global_variables != SmpiPrivStrategies::MMAP,
+ 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 a AF_LOCAL socketpair used for exchanging messages
+ // Create an 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");
+ int res = socketpair(AF_LOCAL, SOCK_SEQPACKET | SOCK_CLOEXEC, 0, sockets);
+ xbt_assert(res != -1, "Could not create socketpair");
- pid_t pid = do_fork([sockets, &code] {
+ pid_t pid = fork();
+ xbt_assert(pid >= 0, "Could not fork model-checked process");
+
+ if (pid == 0) { // Child
::close(sockets[1]);
- setup_child_environment(sockets[0]);
- code();
- xbt_die("The model-checked process failed to exec()");
- });
+ run_child_process(sockets[0], code);
+ DIE_IMPOSSIBLE;
+ }
// Parent (model-checker):
::close(sockets[0]);
- std::unique_ptr<simgrid::mc::RemoteClient> process(new simgrid::mc::RemoteClient(pid, sockets[1]));
- model_checker_.reset(new simgrid::mc::ModelChecker(std::move(process)));
+ xbt_assert(mc_model_checker == nullptr, "Did you manage to start the MC twice in this process?");
+
+ auto process = std::make_unique<simgrid::mc::RemoteSimulation>(pid);
+ model_checker_ = std::make_unique<simgrid::mc::ModelChecker>(std::move(process), sockets[1]);
- xbt_assert(mc_model_checker == nullptr);
mc_model_checker = model_checker_.get();
- mc_model_checker->start();
+ model_checker_->start();
}
Session::~Session()
this->close();
}
+/** Take the initial snapshot of the application, that must be stopped. */
void Session::initialize()
{
xbt_assert(initial_snapshot_ == nullptr);
- mc_model_checker->wait_for_requests();
+ model_checker_->wait_for_requests();
initial_snapshot_ = std::make_shared<simgrid::mc::Snapshot>(0);
}
-void Session::execute(Transition const& transition)
+void Session::execute(Transition const& transition) const
{
model_checker_->handle_simcall(transition);
model_checker_->wait_for_requests();
}
-void Session::restore_initial_state()
+void Session::restore_initial_state() const
{
- this->initial_snapshot_->restore(&mc_model_checker->process());
+ this->initial_snapshot_->restore(&model_checker_->get_remote_simulation());
}
-void Session::log_state()
+void Session::log_state() const
{
- mc_model_checker->getChecker()->log_state();
+ model_checker_->getChecker()->log_state();
if (not _sg_mc_dot_output_file.get().empty()) {
fprintf(dot_output, "}\n");
}
if (getenv("SIMGRID_MC_SYSTEM_STATISTICS")){
int ret=system("free");
- if(ret!=0)XBT_WARN("system call did not return 0, but %d",ret);
+ if (ret != 0)
+ XBT_WARN("Call to system(free) did not return 0, but %d", ret);
}
}
}
}
+bool Session::actor_is_enabled(aid_t pid) const
+{
+ s_mc_message_actor_enabled_t msg{simgrid::mc::MessageType::ACTOR_ENABLED, 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;
}
