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. */
10 #include <sys/types.h>
11 #include <sys/ptrace.h>
12 #include <sys/socket.h>
15 #include <xbt/sysdep.h>
16 #include <xbt/mmalloc.h>
18 #include "src/internal_config.h"
20 #include "src/mc/mc_protocol.h"
21 #include "src/mc/Client.hpp"
23 // We won't need those once the separation MCer/MCed is complete:
24 #include "src/mc/mc_ignore.h"
25 #include "src/mc/mc_private.h" // MC_deadlock_check()
26 #include "src/mc/mc_smx.h"
28 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_client, mc, "MC client logic");
33 std::unique_ptr<Client> Client::client_;
35 Client* Client::initialize()
37 // We are not in MC mode:
38 // TODO, handle this more gracefully.
39 if (!getenv(MC_ENV_SOCKET_FD))
42 // Do not break if we are called multiple times:
46 // Check and set the mode:
47 if (mc_mode != MC_MODE_NONE)
49 mc_mode = MC_MODE_CLIENT;
51 // Fetch socket from MC_ENV_SOCKET_FD:
52 char* fd_env = std::getenv(MC_ENV_SOCKET_FD);
54 xbt_die("No MC socket passed in the environment");
55 int fd = xbt_str_parse_int(fd_env, bprintf("Variable %s should contain a number but contains '%%s'", MC_ENV_SOCKET_FD));
56 XBT_DEBUG("Model-checked application found socket FD %i", fd);
58 // Check the socket type/validity:
60 socklen_t socklen = sizeof(type);
61 if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &type, &socklen) != 0)
62 xbt_die("Could not check socket type");
63 if (type != SOCK_DGRAM)
64 xbt_die("Unexpected socket type %i", type);
65 XBT_DEBUG("Model-checked application found expected socket type");
67 client_ = std::unique_ptr<Client>(new simgrid::mc::Client(fd));
69 // Wait for the model-checker:
70 if (ptrace(PTRACE_TRACEME, 0, nullptr, NULL) == -1 || raise(SIGSTOP) != 0)
71 xbt_die("Could not wait for the model-checker");
73 client_->handleMessages();
77 void Client::handleMessages()
80 XBT_DEBUG("Waiting messages from model-checker");
82 char message_buffer[MC_MESSAGE_LENGTH];
85 if ((s = channel_.receive(&message_buffer, sizeof(message_buffer))) < 0)
86 xbt_die("Could not receive commands from the model-checker");
88 s_mc_message_t message;
89 if ((size_t) s < sizeof(message))
90 xbt_die("Received message is too small");
91 memcpy(&message, message_buffer, sizeof(message));
92 switch (message.type) {
94 case MC_MESSAGE_DEADLOCK_CHECK:
96 int result = MC_deadlock_check();
97 s_mc_int_message_t answer;
98 answer.type = MC_MESSAGE_DEADLOCK_CHECK_REPLY;
99 answer.value = result;
100 if (channel_.send(answer))
101 xbt_die("Could not send response");
105 case MC_MESSAGE_CONTINUE:
108 case MC_MESSAGE_SIMCALL_HANDLE:
110 s_mc_simcall_handle_message_t message;
111 if (s != sizeof(message))
112 xbt_die("Unexpected size for SIMCALL_HANDLE");
113 memcpy(&message, message_buffer, sizeof(message));
114 smx_process_t process = SIMIX_process_from_PID(message.pid);
116 xbt_die("Invalid pid %lu", (unsigned long) message.pid);
117 SIMIX_simcall_handle(&process->simcall, message.value);
118 if (channel_.send(MC_MESSAGE_WAITING))
119 xbt_die("Could not send MESSAGE_WAITING to model-checker");
123 case MC_MESSAGE_RESTORE:
125 s_mc_restore_message_t message;
126 if (s != sizeof(message))
127 xbt_die("Unexpected size for SIMCALL_HANDLE");
128 memcpy(&message, message_buffer, sizeof(message));
129 smpi_really_switch_data_segment(message.index);
134 xbt_die("%s received unexpected message %s (%i)",
135 MC_mode_name(mc_mode),
136 MC_message_type_name(message.type),
143 void Client::mainLoop(void)
146 if (channel_.send(MC_MESSAGE_WAITING))
147 xbt_die("Could not send WAITING mesage to model-checker");
148 this->handleMessages();
149 simgrid::mc::wait_for_requests();
153 void Client::reportAssertionFailure(const char* description)
155 if (channel_.send(MC_MESSAGE_ASSERTION_FAILED))
156 xbt_die("Could not send assertion to model-checker");
157 this->handleMessages();
160 void Client::ignoreMemory(void* addr, std::size_t size)
162 s_mc_ignore_memory_message_t message;
163 message.type = MC_MESSAGE_IGNORE_MEMORY;
164 message.addr = (std::uintptr_t) addr;
166 if (channel_.send(message))
167 xbt_die("Could not send IGNORE_MEMORY mesage to model-checker");
170 void Client::ignoreHeap(void* address, std::size_t size)
172 xbt_mheap_t heap = mmalloc_get_current_heap();
174 s_mc_ignore_heap_message_t message;
175 message.type = MC_MESSAGE_IGNORE_HEAP;
176 message.address = address;
180 (char *) heap->heapbase) / BLOCKSIZE + 1;
181 if (heap->heapinfo[message.block].type == 0) {
182 message.fragment = -1;
183 heap->heapinfo[message.block].busy_block.ignore++;
186 ((uintptr_t) (ADDR2UINT(address) % (BLOCKSIZE))) >>
187 heap->heapinfo[message.block].type;
188 heap->heapinfo[message.block].busy_frag.ignore[message.fragment]++;
191 if (channel_.send(message))
192 xbt_die("Could not send ignored region to MCer");
195 void Client::unignoreHeap(void* address, std::size_t size)
197 s_mc_ignore_memory_message_t message;
198 message.type = MC_MESSAGE_UNIGNORE_HEAP;
199 message.addr = (std::uintptr_t) address;
201 if (channel_.send(message))
202 xbt_die("Could not send IGNORE_HEAP mesasge to model-checker");
205 void Client::declareSymbol(const char *name, int* value)
207 s_mc_register_symbol_message_t message;
208 message.type = MC_MESSAGE_REGISTER_SYMBOL;
209 if (strlen(name) + 1 > sizeof(message.name))
210 xbt_die("Symbol is too long");
211 strncpy(message.name, name, sizeof(message.name));
212 message.callback = nullptr;
213 message.data = value;
214 if (channel_.send(message))
215 xbt_die("Could send REGISTER_SYMBOL message to model-checker");
218 void Client::declareStack(void *stack, size_t size, smx_process_t process, ucontext_t* context)
220 xbt_mheap_t heap = mmalloc_get_current_heap();
222 s_stack_region_t region;
223 memset(®ion, 0, sizeof(region));
224 region.address = stack;
225 region.context = context;
229 (char *) heap->heapbase) / BLOCKSIZE + 1;
231 if (smpi_privatize_global_variables && process)
232 region.process_index = smpi_process_index_of_smx_process(process);
235 region.process_index = -1;
237 s_mc_stack_region_message_t message;
238 message.type = MC_MESSAGE_STACK_REGION;
239 message.stack_region = region;
240 if (channel_.send(message))
241 xbt_die("Coule not send STACK_REGION to model-checker");