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. */
16 #include <sys/types.h>
17 #include <sys/socket.h>
22 #include "simgrid/sg_config.h"
23 #include "xbt_modinter.h"
26 #include "mc_private.h"
27 #include "mc_protocol.h"
28 #include "mc_server.h"
29 #include "mc_model_checker.h"
31 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_main, mc, "Entry point for simgrid-mc");
33 static const bool trace = true;
35 static int do_child(int socket, char** argv)
37 XBT_DEBUG("Inside the child process PID=%i", (int) getpid());
40 // Remove CLOEXEC in order to pass the socket to the exec-ed program:
41 int fdflags = fcntl(socket, F_GETFD, 0);
43 std::perror("simgrid-mc");
44 return MC_SERVER_ERROR;
46 if (fcntl(socket, F_SETFD, fdflags & ~FD_CLOEXEC) == -1) {
47 std::perror("simgrid-mc");
48 return MC_SERVER_ERROR;
51 XBT_DEBUG("CLOEXEC removed on socket %i", socket);
54 setenv(MC_ENV_VARIABLE, "1", 1);
57 res = std::snprintf(buffer, sizeof(buffer), "%i", socket);
58 if ((size_t) res >= sizeof(buffer) || res == -1)
59 return MC_SERVER_ERROR;
60 setenv(MC_ENV_SOCKET_FD, buffer, 1);
62 execvp(argv[1], argv+1);
63 std::perror("simgrid-mc");
64 return MC_SERVER_ERROR;
67 static int do_parent(int socket, pid_t child)
69 XBT_DEBUG("Inside the parent process");
70 if (MC_server_init(child, socket))
71 return MC_SERVER_ERROR;
72 XBT_DEBUG("Server initialized");
77 static char** argvdup(int argc, char** argv)
79 char** argv_copy = xbt_new(char*, argc+1);
80 std::memcpy(argv_copy, argv, sizeof(char*) * argc);
81 argv_copy[argc] = NULL;
85 int main(int argc, char** argv)
87 // We need to keep the original parameters in order to pass them to the
88 // model-checked process:
90 char** argv_copy = argvdup(argc, argv);
91 xbt_log_init(&argc_copy, argv_copy);
92 sg_config_init(&argc_copy, argv_copy);
95 xbt_die("Missing arguments.\n");
97 bool server_mode = false;
98 char* env = std::getenv("SIMGRID_MC_MODE");
100 if (std::strcmp(env, "server") == 0)
102 else if (std::strcmp(env, "standalone") == 0)
105 XBT_WARN("Unrecognised value for SIMGRID_MC_MODE (server/standalone)");
109 setenv(MC_ENV_VARIABLE, "1", 1);
110 execvp(argv[1], argv+1);
112 std::perror("simgrid-mc");
116 // Create a AF_LOCAL socketpair:
120 res = socketpair(AF_LOCAL, SOCK_DGRAM | SOCK_CLOEXEC, 0, sockets);
122 perror("simgrid-mc");
123 return MC_SERVER_ERROR;
126 XBT_DEBUG("Created socketpair");
130 perror("simgrid-mc");
131 return MC_SERVER_ERROR;
132 } else if (pid == 0) {
134 return do_child(sockets[0], argv);
137 return do_parent(sockets[1], pid);