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>
24 #include "simgrid/sg_config.h"
25 #include "xbt_modinter.h"
28 #include "mc_private.h"
29 #include "mc_protocol.h"
30 #include "mc_server.h"
31 #include "mc_model_checker.h"
33 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_main, mc, "Entry point for simgrid-mc");
35 static const bool trace = true;
37 static int do_child(int socket, char** argv)
39 XBT_DEBUG("Inside the child process PID=%i", (int) getpid());
42 // Remove CLOEXEC in order to pass the socket to the exec-ed program:
43 int fdflags = fcntl(socket, F_GETFD, 0);
45 std::perror("simgrid-mc");
46 return MC_SERVER_ERROR;
48 if (fcntl(socket, F_SETFD, fdflags & ~FD_CLOEXEC) == -1) {
49 std::perror("simgrid-mc");
50 return MC_SERVER_ERROR;
53 XBT_DEBUG("CLOEXEC removed on socket %i", socket);
56 setenv(MC_ENV_VARIABLE, "1", 1);
59 res = std::snprintf(buffer, sizeof(buffer), "%i", socket);
60 if ((size_t) res >= sizeof(buffer) || res == -1)
61 return MC_SERVER_ERROR;
62 setenv(MC_ENV_SOCKET_FD, buffer, 1);
64 execvp(argv[1], argv+1);
65 std::perror("simgrid-mc");
66 return MC_SERVER_ERROR;
69 static int do_parent(int socket, pid_t child)
71 XBT_DEBUG("Inside the parent process");
73 xbt_die("MC server already present");
75 mc_mode = MC_MODE_SERVER;
76 mc_server = new s_mc_server(child, socket);
78 MC_init_pid(child, socket);
79 mc_server->resume(&mc_model_checker->process);
81 mc_server->shutdown();
84 catch(std::exception& e) {
87 exit(MC_SERVER_ERROR);
90 static char** argvdup(int argc, char** argv)
92 char** argv_copy = xbt_new(char*, argc+1);
93 std::memcpy(argv_copy, argv, sizeof(char*) * argc);
94 argv_copy[argc] = NULL;
98 int main(int argc, char** argv)
100 // We need to keep the original parameters in order to pass them to the
101 // model-checked process:
102 int argc_copy = argc;
103 char** argv_copy = argvdup(argc, argv);
104 xbt_log_init(&argc_copy, argv_copy);
105 sg_config_init(&argc_copy, argv_copy);
108 xbt_die("Missing arguments.\n");
110 bool server_mode = false;
111 char* env = std::getenv("SIMGRID_MC_MODE");
113 if (std::strcmp(env, "server") == 0)
115 else if (std::strcmp(env, "standalone") == 0)
118 XBT_WARN("Unrecognised value for SIMGRID_MC_MODE (server/standalone)");
122 setenv(MC_ENV_VARIABLE, "1", 1);
123 execvp(argv[1], argv+1);
125 std::perror("simgrid-mc");
129 // Create a AF_LOCAL socketpair:
133 res = socketpair(AF_LOCAL, SOCK_DGRAM | SOCK_CLOEXEC, 0, sockets);
135 perror("simgrid-mc");
136 return MC_SERVER_ERROR;
139 XBT_DEBUG("Created socketpair");
143 perror("simgrid-mc");
144 return MC_SERVER_ERROR;
145 } else if (pid == 0) {
147 return do_child(sockets[0], argv);
150 return do_parent(sockets[1], pid);