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"
35 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_main, mc, "Entry point for simgrid-mc");
37 static const bool trace = true;
39 static int do_child(int socket, char** argv)
41 XBT_DEBUG("Inside the child process PID=%i", (int) getpid());
42 if (prctl(PR_SET_PDEATHSIG, SIGHUP) != 0) {
43 std::perror("simgrid-mc");
44 return MC_SERVER_ERROR;
48 // Remove CLOEXEC in order to pass the socket to the exec-ed program:
49 int fdflags = fcntl(socket, F_GETFD, 0);
51 std::perror("simgrid-mc");
52 return MC_SERVER_ERROR;
54 if (fcntl(socket, F_SETFD, fdflags & ~FD_CLOEXEC) == -1) {
55 std::perror("simgrid-mc");
56 return MC_SERVER_ERROR;
59 XBT_DEBUG("CLOEXEC removed on socket %i", socket);
62 setenv(MC_ENV_VARIABLE, "1", 1);
65 res = std::snprintf(buffer, sizeof(buffer), "%i", socket);
66 if ((size_t) res >= sizeof(buffer) || res == -1)
67 return MC_SERVER_ERROR;
68 setenv(MC_ENV_SOCKET_FD, buffer, 1);
70 execvp(argv[1], argv+1);
71 std::perror("simgrid-mc");
72 return MC_SERVER_ERROR;
75 static int do_parent(int socket, pid_t child)
77 XBT_DEBUG("Inside the parent process");
79 xbt_die("MC server already present");
81 mc_mode = MC_MODE_SERVER;
82 mc_server = new s_mc_server(child, socket);
84 MC_init_pid(child, socket);
85 MC_do_the_modelcheck_for_real();
86 mc_server->shutdown();
89 catch(std::exception& e) {
92 exit(MC_SERVER_ERROR);
95 static char** argvdup(int argc, char** argv)
97 char** argv_copy = xbt_new(char*, argc+1);
98 std::memcpy(argv_copy, argv, sizeof(char*) * argc);
99 argv_copy[argc] = NULL;
103 int main(int argc, char** argv)
105 // We need to keep the original parameters in order to pass them to the
106 // model-checked process:
107 int argc_copy = argc;
108 char** argv_copy = argvdup(argc, argv);
109 xbt_log_init(&argc_copy, argv_copy);
110 sg_config_init(&argc_copy, argv_copy);
113 xbt_die("Missing arguments.\n");
115 bool server_mode = true;
116 char* env = std::getenv("SIMGRID_MC_MODE");
118 if (std::strcmp(env, "server") == 0)
120 else if (std::strcmp(env, "standalone") == 0)
123 xbt_die("Unrecognised value for SIMGRID_MC_MODE (server/standalone)");
127 setenv(MC_ENV_VARIABLE, "1", 1);
128 execvp(argv[1], argv+1);
130 std::perror("simgrid-mc");
134 // Create a AF_LOCAL socketpair:
138 res = socketpair(AF_LOCAL, SOCK_DGRAM | SOCK_CLOEXEC, 0, sockets);
140 perror("simgrid-mc");
141 return MC_SERVER_ERROR;
144 XBT_DEBUG("Created socketpair");
148 perror("simgrid-mc");
149 return MC_SERVER_ERROR;
150 } else if (pid == 0) {
152 return do_child(sockets[0], argv);
155 return do_parent(sockets[1], pid);