1 /* Copyright (c) 2015-2023. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #ifndef SIMGRID_MC_PROTOCOL_H
7 #define SIMGRID_MC_PROTOCOL_H
9 // ***** Environment variables for passing context to the model-checked process
13 #include "src/kernel/actor/SimcallObserver.hpp"
15 #include "simgrid/forward.h" // aid_t
16 #include "src/mc/datatypes.h"
17 #include <xbt/utility.hpp>
24 namespace simgrid::mc {
26 XBT_DECLARE_ENUM_CLASS(MessageType, NONE, FORK, FORK_REPLY, WAIT_CHILD, WAIT_CHILD_REPLY, CONTINUE, DEADLOCK_CHECK,
27 DEADLOCK_CHECK_REPLY, WAITING, SIMCALL_EXECUTE, SIMCALL_EXECUTE_REPLY, ASSERTION_FAILED,
28 ACTORS_STATUS, ACTORS_STATUS_REPLY_COUNT, ACTORS_STATUS_REPLY_SIMCALL,
29 ACTORS_STATUS_REPLY_TRANSITION, ACTORS_MAXPID, ACTORS_MAXPID_REPLY, FINALIZE, FINALIZE_REPLY);
30 } // namespace simgrid::mc
32 constexpr unsigned MC_MESSAGE_LENGTH = 512;
33 constexpr unsigned MC_SOCKET_NAME_LEN = sizeof(sockaddr_un::sun_path);
34 constexpr unsigned SIMCALL_SERIALIZATION_BUFFER_SIZE = 2048;
36 /** Basic structure for a MC message
38 * The current version of the client/server protocol sends C structures over `AF_UNIX`
39 * `SOCK_SEQPACKET` sockets. This means that the protocol is ABI/architecture specific:
40 * we currently can't model-check a x86 process from a x86_64 process.
42 * Moreover the protocol is not stable. The same version of the library should be used
43 * for the client and the server.
46 /* Basic structure: all message start with a message type */
47 struct s_mc_message_t {
48 simgrid::mc::MessageType type;
51 struct s_mc_message_int_t {
52 simgrid::mc::MessageType type;
58 /* Server -> client */
59 struct s_mc_message_fork_t {
60 simgrid::mc::MessageType type;
61 std::array<char, MC_SOCKET_NAME_LEN> socket_name;
64 struct s_mc_message_simcall_execute_t {
65 simgrid::mc::MessageType type;
67 int times_considered_;
69 struct s_mc_message_simcall_execute_answer_t {
70 simgrid::mc::MessageType type;
71 std::array<char, SIMCALL_SERIALIZATION_BUFFER_SIZE> buffer;
74 struct s_mc_message_restore_t {
75 simgrid::mc::MessageType type;
79 struct s_mc_message_actors_status_answer_t {
80 simgrid::mc::MessageType type;
83 struct s_mc_message_actors_status_one_t { // an array of `s_mc_message_actors_status_one_t[count]` is sent right after
84 // after a `s_mc_message_actors_status_answer_t`
85 simgrid::mc::MessageType type;
91 // Answer from an actor to the question "what are you about to run?"
92 struct s_mc_message_simcall_probe_one_t { // a series of `s_mc_message_simcall_probe_one_t`
93 // is sent right after `s_mc_message_actors_status_one_t[]`
94 simgrid::mc::MessageType type;
95 std::array<char, SIMCALL_SERIALIZATION_BUFFER_SIZE> buffer;