1 /* Copyright (c) 2015. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
18 #include <sys/types.h>
19 #include <sys/socket.h>
21 #include <sys/prctl.h>
25 #include "simgrid/sg_config.h"
26 #include "xbt_modinter.h"
29 #include "mc_private.h"
30 #include "mc_protocol.h"
31 #include "mc_server.h"
32 #include "mc_model_checker.h"
33 #include "mc_safety.h"
34 #include "mc_comm_pattern.h"
35 #include "mc_liveness.h"
37 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_main, mc, "Entry point for simgrid-mc");
39 static const bool trace = true;
41 static int do_child(int socket, char** argv)
43 XBT_DEBUG("Inside the child process PID=%i", (int) getpid());
44 if (prctl(PR_SET_PDEATHSIG, SIGHUP) != 0) {
45 std::perror("simgrid-mc");
46 return MC_SERVER_ERROR;
50 // Remove CLOEXEC in order to pass the socket to the exec-ed program:
51 int fdflags = fcntl(socket, F_GETFD, 0);
53 std::perror("simgrid-mc");
54 return MC_SERVER_ERROR;
56 if (fcntl(socket, F_SETFD, fdflags & ~FD_CLOEXEC) == -1) {
57 std::perror("simgrid-mc");
58 return MC_SERVER_ERROR;
61 XBT_DEBUG("CLOEXEC removed on socket %i", socket);
64 setenv(MC_ENV_VARIABLE, "1", 1);
67 res = std::snprintf(buffer, sizeof(buffer), "%i", socket);
68 if ((size_t) res >= sizeof(buffer) || res == -1)
69 return MC_SERVER_ERROR;
70 setenv(MC_ENV_SOCKET_FD, buffer, 1);
72 execvp(argv[1], argv+1);
73 std::perror("simgrid-mc");
74 return MC_SERVER_ERROR;
77 static int do_parent(int socket, pid_t child)
79 XBT_DEBUG("Inside the parent process");
81 xbt_die("MC server already present");
83 mc_mode = MC_MODE_SERVER;
84 mc_server = new s_mc_server(child, socket);
86 MC_init_pid(child, socket);
87 if (_sg_mc_comms_determinism || _sg_mc_send_determinism)
88 MC_modelcheck_comm_determinism();
89 else if (!_sg_mc_property_file || _sg_mc_property_file[0] == '\0')
90 MC_modelcheck_safety();
92 MC_modelcheck_liveness();
93 mc_server->shutdown();
96 catch(std::exception& e) {
99 exit(MC_SERVER_ERROR);
102 static char** argvdup(int argc, char** argv)
104 char** argv_copy = xbt_new(char*, argc+1);
105 std::memcpy(argv_copy, argv, sizeof(char*) * argc);
106 argv_copy[argc] = NULL;
110 int main(int argc, char** argv)
112 // We need to keep the original parameters in order to pass them to the
113 // model-checked process:
114 int argc_copy = argc;
115 char** argv_copy = argvdup(argc, argv);
116 xbt_log_init(&argc_copy, argv_copy);
117 sg_config_init(&argc_copy, argv_copy);
120 xbt_die("Missing arguments.\n");
122 bool server_mode = true;
123 char* env = std::getenv("SIMGRID_MC_MODE");
125 if (std::strcmp(env, "server") == 0)
127 else if (std::strcmp(env, "standalone") == 0)
130 xbt_die("Unrecognised value for SIMGRID_MC_MODE (server/standalone)");
134 setenv(MC_ENV_VARIABLE, "1", 1);
135 execvp(argv[1], argv+1);
137 std::perror("simgrid-mc");
141 // Create a AF_LOCAL socketpair:
145 res = socketpair(AF_LOCAL, SOCK_DGRAM | SOCK_CLOEXEC, 0, sockets);
147 perror("simgrid-mc");
148 return MC_SERVER_ERROR;
151 XBT_DEBUG("Created socketpair");
155 perror("simgrid-mc");
156 return MC_SERVER_ERROR;
157 } else if (pid == 0) {
159 return do_child(sockets[0], argv);
162 return do_parent(sockets[1], pid);