1 /* Copyright (c) 2008-2014. 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. */
13 #include "internal_config.h"
14 #include "mc_memory_map.h"
15 #include "mc_private.h"
16 #include "xbt/module.h"
17 #include <xbt/mmalloc.h>
18 #include "../smpi/private.h"
21 #include "xbt/mmalloc/mmprivate.h"
23 #include "../simix/smx_private.h"
25 #include <libunwind.h>
28 #include "mc_private.h"
31 #include "mc_snapshot.h"
32 #include "mc_object_info.h"
35 #include "mc_protocol.h"
40 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkpoint, mc,
41 "Logging specific to mc_checkpoint");
43 /************************************ Free functions **************************************/
44 /*****************************************************************************************/
46 static void MC_snapshot_stack_free(mc_snapshot_stack_t s)
49 xbt_dynar_free(&(s->local_variables));
50 xbt_dynar_free(&(s->stack_frames));
51 mc_unw_destroy_context(s->context);
57 static void MC_snapshot_stack_free_voidp(void *s)
59 mc_snapshot_stack_t stack = (mc_snapshot_stack_t) * (void **) s;
60 MC_snapshot_stack_free(stack);
63 static void local_variable_free(local_variable_t v)
69 static void local_variable_free_voidp(void *v)
71 local_variable_free((local_variable_t) * (void **) v);
74 void MC_region_destroy(mc_mem_region_t region)
78 switch(region->storage_type) {
79 case MC_REGION_STORAGE_TYPE_NONE:
81 case MC_REGION_STORAGE_TYPE_FLAT:
82 xbt_free(region->flat.data);
84 case MC_REGION_STORAGE_TYPE_CHUNKED:
85 mc_free_page_snapshot_region(region->chunked.page_numbers, mc_page_count(region->size));
86 xbt_free(region->chunked.page_numbers);
88 case MC_REGION_STORAGE_TYPE_PRIVATIZED:
90 size_t regions_count = region->privatized.regions_count;
91 for (size_t i=0; i!=regions_count; ++i) {
92 MC_region_destroy(region->privatized.regions[i]);
94 free(region->privatized.regions);
101 /******************************* Snapshot regions ********************************/
102 /*********************************************************************************/
104 static mc_mem_region_t mc_region_new_dense(
105 mc_region_type_t region_type,
106 void *start_addr, void* permanent_addr, size_t size)
108 mc_mem_region_t region = xbt_new(s_mc_mem_region_t, 1);
109 region->region_type = region_type;
110 region->storage_type = MC_REGION_STORAGE_TYPE_FLAT;
111 region->start_addr = start_addr;
112 region->permanent_addr = permanent_addr;
114 region->flat.data = xbt_malloc(size);
115 MC_process_read(&mc_model_checker->process(), MC_ADDRESS_SPACE_READ_FLAGS_NONE,
116 region->flat.data, permanent_addr, size,
117 MC_PROCESS_INDEX_DISABLED);
118 XBT_DEBUG("New region : type : %d, data : %p (real addr %p), size : %zu",
119 region_type, region->flat.data, permanent_addr, size);
123 /** @brief Take a snapshot of a given region
126 * @param start_addr Address of the region in the simulated process
127 * @param permanent_addr Permanent address of this data (for privatized variables, this is the virtual address of the privatized mapping)
128 * @param size Size of the data*
130 static mc_mem_region_t MC_region_new(
131 mc_region_type_t type, void *start_addr, void* permanent_addr, size_t size)
133 if (_sg_mc_sparse_checkpoint) {
134 return mc_region_new_sparse(type, start_addr, permanent_addr, size);
136 return mc_region_new_dense(type, start_addr, permanent_addr, size);
140 /** @brief Restore a region from a snapshot
142 * @param reg Target region
144 static void MC_region_restore(mc_mem_region_t region)
146 switch(region->storage_type) {
147 case MC_REGION_STORAGE_TYPE_NONE:
149 xbt_die("Storage type not supported");
152 case MC_REGION_STORAGE_TYPE_FLAT:
153 MC_process_write(&mc_model_checker->process(), region->flat.data,
154 region->permanent_addr, region->size);
157 case MC_REGION_STORAGE_TYPE_CHUNKED:
158 mc_region_restore_sparse(&mc_model_checker->process(), region);
161 case MC_REGION_STORAGE_TYPE_PRIVATIZED:
163 size_t process_count = region->privatized.regions_count;
164 for (size_t i = 0; i < process_count; i++) {
165 MC_region_restore(region->privatized.regions[i]);
172 static mc_mem_region_t MC_region_new_privatized(
173 mc_region_type_t region_type, void *start_addr, void* permanent_addr, size_t size
176 size_t process_count = MC_smpi_process_count();
177 mc_mem_region_t region = xbt_new(s_mc_mem_region_t, 1);
178 region->region_type = region_type;
179 region->storage_type = MC_REGION_STORAGE_TYPE_PRIVATIZED;
180 region->start_addr = start_addr;
181 region->permanent_addr = permanent_addr;
183 region->privatized.regions_count = process_count;
184 region->privatized.regions = xbt_new(mc_mem_region_t, process_count);
186 // Read smpi_privatisation_regions from MCed:
187 smpi_privatisation_region_t remote_smpi_privatisation_regions;
188 MC_process_read_variable(&mc_model_checker->process(),
189 "smpi_privatisation_regions",
190 &remote_smpi_privatisation_regions, sizeof(remote_smpi_privatisation_regions));
191 s_smpi_privatisation_region_t privatisation_regions[process_count];
192 MC_process_read_simple(&mc_model_checker->process(), &privatisation_regions,
193 remote_smpi_privatisation_regions, sizeof(privatisation_regions));
195 for (size_t i = 0; i < process_count; i++) {
196 region->privatized.regions[i] =
197 MC_region_new(region_type, start_addr,
198 privatisation_regions[i].address, size);
204 static void MC_snapshot_add_region(int index, mc_snapshot_t snapshot, mc_region_type_t type,
205 mc_object_info_t object_info,
206 void *start_addr, void* permanent_addr, size_t size)
208 if (type == MC_REGION_TYPE_DATA)
209 xbt_assert(object_info, "Missing object info for object.");
210 else if (type == MC_REGION_TYPE_HEAP)
211 xbt_assert(!object_info, "Unexpected object info for heap region.");
213 mc_mem_region_t region;
214 const bool privatization_aware = MC_object_info_is_privatized(object_info);
215 if (privatization_aware && MC_smpi_process_count())
216 region = MC_region_new_privatized(type, start_addr, permanent_addr, size);
218 region = MC_region_new(type, start_addr, permanent_addr, size);
220 region->object_info = object_info;
221 snapshot->snapshot_regions[index] = region;
225 static void MC_get_memory_regions(mc_process_t process, mc_snapshot_t snapshot)
227 const size_t n = process->object_infos_size;
228 snapshot->snapshot_regions_count = n + 1;
229 snapshot->snapshot_regions = xbt_new0(mc_mem_region_t, n + 1);
231 for (size_t i = 0; i!=n; ++i) {
232 mc_object_info_t object_info = process->object_infos[i];
233 MC_snapshot_add_region(i, snapshot, MC_REGION_TYPE_DATA, object_info,
234 object_info->start_rw, object_info->start_rw,
235 object_info->end_rw - object_info->start_rw);
238 xbt_mheap_t heap = MC_process_get_heap(process);
239 void *start_heap = heap->base;
240 void *end_heap = heap->breakval;
242 MC_snapshot_add_region(n, snapshot, MC_REGION_TYPE_HEAP, NULL,
243 start_heap, start_heap,
244 (char *) end_heap - (char *) start_heap);
245 snapshot->heap_bytes_used = mmalloc_get_bytes_used_remote(
247 MC_process_get_malloc_info(process));
250 if (smpi_privatize_global_variables && MC_smpi_process_count()) {
251 // snapshot->privatization_index = smpi_loaded_page
252 MC_process_read_variable(&mc_model_checker->process(),
253 "smpi_loaded_page", &snapshot->privatization_index,
254 sizeof(snapshot->privatization_index));
258 snapshot->privatization_index = MC_PROCESS_INDEX_MISSING;
262 /** \brief Fills the position of the segments (executable, read-only, read/write).
264 * `dl_iterate_phdr` would be more robust but would not work in cross-process.
266 void MC_find_object_address(memory_map_t maps, mc_object_info_t result)
270 const char *name = basename(result->file_name);
271 while (i < maps->mapsize) {
272 reg = maps->regions[i];
273 if (maps->regions[i].pathname == NULL
274 || strcmp(basename(maps->regions[i].pathname), name)) {
276 } else if ((reg.prot & PROT_WRITE)) {
277 xbt_assert(!result->start_rw,
278 "Multiple read-write segments for %s, not supported",
279 maps->regions[i].pathname);
280 result->start_rw = (char*) reg.start_addr;
281 result->end_rw = (char*) reg.end_addr;
282 // .bss is usually after the .data:
283 s_map_region_t *next = &(maps->regions[i + 1]);
284 if (next->pathname == NULL && (next->prot & PROT_WRITE)
285 && next->start_addr == reg.end_addr) {
286 result->end_rw = (char*) maps->regions[i + 1].end_addr;
288 } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)) {
289 xbt_assert(!result->start_exec,
290 "Multiple executable segments for %s, not supported",
291 maps->regions[i].pathname);
292 result->start_exec = (char*) reg.start_addr;
293 result->end_exec = (char*) reg.end_addr;
294 } else if ((reg.prot & PROT_READ) && !(reg.prot & PROT_EXEC)) {
295 xbt_assert(!result->start_ro,
296 "Multiple read only segments for %s, not supported",
297 maps->regions[i].pathname);
298 result->start_ro = (char*) reg.start_addr;
299 result->end_ro = (char*) reg.end_addr;
304 result->start = result->start_rw;
305 if ((const void*) result->start_ro > result->start)
306 result->start = result->start_ro;
307 if ((const void*) result->start_exec > result->start)
308 result->start = result->start_exec;
310 result->end = result->end_rw;
311 if (result->end_ro && (const void*) result->end_ro < result->end)
312 result->end = result->end_ro;
313 if (result->end_exec && (const void*) result->end_exec > result->end)
314 result->end = result->end_exec;
316 xbt_assert(result->file_name);
317 xbt_assert(result->start_rw);
318 xbt_assert(result->start_exec);
321 /************************************* Take Snapshot ************************************/
322 /****************************************************************************************/
324 /** \brief Checks whether the variable is in scope for a given IP.
326 * A variable may be defined only from a given value of IP.
328 * \param var Variable description
329 * \param frame Scope description
330 * \param ip Instruction pointer
331 * \return true if the variable is valid
333 static bool mc_valid_variable(dw_variable_t var, dw_frame_t scope,
336 // The variable is not yet valid:
337 if ((const void *) ((const char *) scope->low_pc + var->start_scope) > ip)
343 static void mc_fill_local_variables_values(mc_stack_frame_t stack_frame,
344 dw_frame_t scope, int process_index, xbt_dynar_t result)
346 mc_process_t process = &mc_model_checker->process();
348 void *ip = (void *) stack_frame->ip;
349 if (ip < scope->low_pc || ip >= scope->high_pc)
353 dw_variable_t current_variable;
354 xbt_dynar_foreach(scope->variables, cursor, current_variable) {
356 if (!mc_valid_variable(current_variable, scope, (void *) stack_frame->ip))
360 // FIXME, get rid of `region_type`
361 if ((long) stack_frame->ip > (long) process->libsimgrid_info->start_exec)
366 local_variable_t new_var = xbt_new0(s_local_variable_t, 1);
367 new_var->subprogram = stack_frame->frame;
368 new_var->ip = stack_frame->ip;
369 new_var->name = xbt_strdup(current_variable->name);
370 new_var->type = current_variable->type;
371 new_var->region = region_type;
373 if (current_variable->address != NULL) {
374 new_var->address = current_variable->address;
375 } else if (current_variable->locations.size != 0) {
376 s_mc_location_t location;
377 mc_dwarf_resolve_locations(
378 &location, ¤t_variable->locations,
379 current_variable->object_info,
380 &(stack_frame->unw_cursor),
381 (void *) stack_frame->frame_base,
382 &mc_model_checker->process(), process_index);
384 switch(mc_get_location_type(&location)) {
385 case MC_LOCATION_TYPE_ADDRESS:
386 new_var->address = location.memory_location;
388 case MC_LOCATION_TYPE_REGISTER:
390 xbt_die("Cannot handle non-address variable");
394 xbt_die("No address");
397 xbt_dynar_push(result, &new_var);
400 // Recursive processing of nested scopes:
401 dw_frame_t nested_scope = NULL;
402 xbt_dynar_foreach(scope->scopes, cursor, nested_scope) {
403 mc_fill_local_variables_values(stack_frame, nested_scope, process_index, result);
407 static xbt_dynar_t MC_get_local_variables_values(xbt_dynar_t stack_frames, int process_index)
410 unsigned cursor1 = 0;
411 mc_stack_frame_t stack_frame;
412 xbt_dynar_t variables =
413 xbt_dynar_new(sizeof(local_variable_t), local_variable_free_voidp);
415 xbt_dynar_foreach(stack_frames, cursor1, stack_frame) {
416 mc_fill_local_variables_values(stack_frame, stack_frame->frame, process_index, variables);
422 static void MC_stack_frame_free_voipd(void *s)
424 mc_stack_frame_t stack_frame = *(mc_stack_frame_t *) s;
426 xbt_free(stack_frame->frame_name);
427 xbt_free(stack_frame);
431 static xbt_dynar_t MC_unwind_stack_frames(mc_unw_context_t stack_context)
433 mc_process_t process = &mc_model_checker->process();
435 xbt_dynar_new(sizeof(mc_stack_frame_t), MC_stack_frame_free_voipd);
439 // TODO, check condition check (unw_init_local==0 means end of frame)
440 if (mc_unw_init_cursor(&c, stack_context) != 0) {
442 xbt_die("Could not initialize stack unwinding");
447 mc_stack_frame_t stack_frame = xbt_new(s_mc_stack_frame_t, 1);
448 xbt_dynar_push(result, &stack_frame);
450 stack_frame->unw_cursor = c;
454 unw_get_reg(&c, UNW_REG_IP, &ip);
455 unw_get_reg(&c, UNW_REG_SP, &sp);
457 stack_frame->ip = ip;
458 stack_frame->sp = sp;
460 // TODO, use real addresses in frame_t instead of fixing it here
462 dw_frame_t frame = MC_process_find_function(process, (void *) ip);
463 stack_frame->frame = frame;
466 stack_frame->frame_name = xbt_strdup(frame->name);
467 stack_frame->frame_base =
468 (unw_word_t) mc_find_frame_base(frame, frame->object_info, &c);
470 stack_frame->frame_base = 0;
471 stack_frame->frame_name = NULL;
474 /* Stop before context switch with maestro */
475 if (frame != NULL && frame->name != NULL
476 && !strcmp(frame->name, "smx_ctx_sysv_wrapper"))
479 int ret = unw_step(&c);
481 xbt_die("Unexpected end of stack.");
482 } else if (ret < 0) {
483 xbt_die("Error while unwinding stack");
487 if (xbt_dynar_length(result) == 0) {
488 XBT_INFO("unw_init_local failed");
495 static xbt_dynar_t MC_take_snapshot_stacks(mc_snapshot_t * snapshot)
499 xbt_dynar_new(sizeof(s_mc_snapshot_stack_t),
500 MC_snapshot_stack_free_voidp);
502 unsigned int cursor = 0;
503 stack_region_t current_stack;
505 // FIXME, cross-process support (stack_areas)
506 xbt_dynar_foreach(stacks_areas, cursor, current_stack) {
507 mc_snapshot_stack_t st = xbt_new(s_mc_snapshot_stack_t, 1);
509 // Read the context from remote process:
510 unw_context_t context;
511 MC_process_read_simple(&mc_model_checker->process(),
512 &context, (unw_context_t*) current_stack->context, sizeof(context));
514 st->context = xbt_new0(s_mc_unw_context_t, 1);
515 if (mc_unw_init_context(st->context, &mc_model_checker->process(),
517 xbt_die("Could not initialise the libunwind context.");
520 st->stack_frames = MC_unwind_stack_frames(st->context);
521 st->local_variables = MC_get_local_variables_values(st->stack_frames, current_stack->process_index);
522 st->process_index = current_stack->process_index;
524 unw_word_t sp = xbt_dynar_get_as(st->stack_frames, 0, mc_stack_frame_t)->sp;
526 xbt_dynar_push(res, &st);
527 (*snapshot)->stack_sizes = (size_t*)
528 xbt_realloc((*snapshot)->stack_sizes, (cursor + 1) * sizeof(size_t));
529 (*snapshot)->stack_sizes[cursor] =
530 (char*) current_stack->address + current_stack->size - (char*) sp;
537 static xbt_dynar_t MC_take_snapshot_ignore()
540 if (mc_heap_comparison_ignore == NULL)
544 xbt_dynar_new(sizeof(mc_heap_ignore_region_t),
545 heap_ignore_region_free_voidp);
547 unsigned int cursor = 0;
548 mc_heap_ignore_region_t current_region;
550 xbt_dynar_foreach(mc_heap_comparison_ignore, cursor, current_region) {
551 mc_heap_ignore_region_t new_region = NULL;
552 new_region = xbt_new0(s_mc_heap_ignore_region_t, 1);
553 new_region->address = current_region->address;
554 new_region->size = current_region->size;
555 new_region->block = current_region->block;
556 new_region->fragment = current_region->fragment;
557 xbt_dynar_push(cpy, &new_region);
564 static void mc_free_snapshot_ignored_data_pvoid(void* data) {
565 mc_snapshot_ignored_data_t ignored_data = (mc_snapshot_ignored_data_t) data;
566 free(ignored_data->data);
569 static void MC_snapshot_handle_ignore(mc_snapshot_t snapshot)
571 xbt_assert(snapshot->process);
572 snapshot->ignored_data = xbt_dynar_new(sizeof(s_mc_snapshot_ignored_data_t), mc_free_snapshot_ignored_data_pvoid);
575 unsigned int cursor = 0;
576 mc_checkpoint_ignore_region_t region;
577 xbt_dynar_foreach (mc_model_checker->process().checkpoint_ignore, cursor, region) {
578 s_mc_snapshot_ignored_data_t ignored_data;
579 ignored_data.start = region->addr;
580 ignored_data.size = region->size;
581 ignored_data.data = malloc(region->size);
582 // TODO, we should do this once per privatization segment:
583 MC_process_read(snapshot->process,
584 MC_ADDRESS_SPACE_READ_FLAGS_NONE,
585 ignored_data.data, region->addr, region->size, MC_PROCESS_INDEX_DISABLED);
586 xbt_dynar_push(snapshot->ignored_data, &ignored_data);
590 xbt_dynar_foreach (mc_model_checker->process().checkpoint_ignore, cursor, region) {
591 MC_process_clear_memory(snapshot->process, region->addr, region->size);
596 static void MC_snapshot_ignore_restore(mc_snapshot_t snapshot)
598 unsigned int cursor = 0;
599 s_mc_snapshot_ignored_data_t ignored_data;
600 xbt_dynar_foreach (snapshot->ignored_data, cursor, ignored_data) {
601 MC_process_write(snapshot->process,
602 ignored_data.data, ignored_data.start, ignored_data.size);
606 static void MC_get_current_fd(mc_snapshot_t snapshot)
609 snapshot->total_fd = 0;
611 const size_t fd_dir_path_size = 20;
612 char fd_dir_path[fd_dir_path_size];
613 int res = snprintf(fd_dir_path, fd_dir_path_size,
614 "/proc/%lli/fd", (long long int) snapshot->process->pid);
615 xbt_assert(res >= 0);
616 if ((size_t) res > fd_dir_path_size)
617 xbt_die("Unexpected buffer is too small for fd_dir_path");
619 DIR* fd_dir = opendir(fd_dir_path);
621 xbt_die("Cannot open directory '/proc/self/fd'\n");
624 struct dirent* fd_number;
625 while ((fd_number = readdir(fd_dir))) {
627 int fd_value = atoi(fd_number->d_name);
632 const size_t source_size = 25;
634 int res = snprintf(source, source_size, "/proc/%lli/fd/%s",
635 (long long int) snapshot->process->pid, fd_number->d_name);
636 xbt_assert(res >= 0);
637 if ((size_t) res > source_size)
638 xbt_die("Unexpected buffer is too small for fd %s", fd_number->d_name);
640 const size_t link_size = 200;
642 res = readlink(source, link, link_size);
644 xbt_die("Could not read link for %s", source);
647 xbt_die("Buffer to small for link of %s", source);
651 if(smpi_is_privatisation_file(link))
654 // This is (probably) the DIR* we are reading:
655 // TODO, read all the file entries at once and close the DIR.*
656 if(strcmp(fd_dir_path, link) == 0)
659 // We don't handle them.
660 // It does not mean we should silently ignore them however.
661 if (strncmp(link, "pipe:", 5) == 0 || strncmp(link, "socket:", 7) == 0)
664 // If dot_output enabled, do not handle the corresponding file
665 if (dot_output != NULL && strcmp(basename(link), _sg_mc_dot_output_file) == 0)
668 // This is probably a shared memory used by lttng-ust:
669 if(strncmp("/dev/shm/ust-shm-tmp-", link, 21)==0)
672 // Add an entry for this FD in the snapshot:
673 fd_infos_t fd = xbt_new0(s_fd_infos_t, 1);
674 fd->filename = strdup(link);
675 fd->number = fd_value;
676 fd->flags = fcntl(fd_value, F_GETFL) | fcntl(fd_value, F_GETFD) ;
677 fd->current_position = lseek(fd_value, 0, SEEK_CUR);
678 snapshot->current_fd = (fd_infos_t*) xbt_realloc(snapshot->current_fd, (total_fd + 1) * sizeof(fd_infos_t));
679 snapshot->current_fd[total_fd] = fd;
683 snapshot->total_fd = total_fd;
687 mc_snapshot_t MC_take_snapshot(int num_state)
689 XBT_DEBUG("Taking snapshot %i", num_state);
691 mc_process_t mc_process = &mc_model_checker->process();
693 mc_snapshot_t snapshot = new simgrid::mc::Snapshot();
695 snapshot->process = mc_process;
696 snapshot->num_state = num_state;
698 snapshot->enabled_processes = xbt_dynar_new(sizeof(int), NULL);
700 smx_process_t process;
701 MC_EACH_SIMIX_PROCESS(process,
702 xbt_dynar_push_as(snapshot->enabled_processes, int, (int)process->pid));
704 MC_snapshot_handle_ignore(snapshot);
706 if (_sg_mc_snapshot_fds)
707 MC_get_current_fd(snapshot);
709 /* Save the std heap and the writable mapped pages of libsimgrid and binary */
710 MC_get_memory_regions(mc_process, snapshot);
712 snapshot->to_ignore = MC_take_snapshot_ignore();
714 if (_sg_mc_visited > 0 || strcmp(_sg_mc_property_file, "")) {
716 MC_take_snapshot_stacks(&snapshot);
717 if (_sg_mc_hash && snapshot->stacks != NULL) {
718 snapshot->hash = mc_hash_processes_state(num_state, snapshot->stacks);
726 MC_snapshot_ignore_restore(snapshot);
731 void MC_restore_snapshot_regions(mc_snapshot_t snapshot)
733 const size_t n = snapshot->snapshot_regions_count;
734 for (size_t i = 0; i < n; i++) {
735 // For privatized, variables we decided it was not necessary to take the snapshot:
736 if (snapshot->snapshot_regions[i])
737 MC_region_restore(snapshot->snapshot_regions[i]);
741 // TODO, send a message to implement this in the MCed process
742 if(snapshot->privatization_index >= 0) {
743 // We just rewrote the global variables.
744 // The privatisation segment SMPI thinks
745 // is mapped might be inconsistent with the segment which
746 // is really mapped in memory (kernel state).
747 // We ask politely SMPI to map the segment anyway,
748 // even if it thinks it is the current one:
749 smpi_really_switch_data_segment(snapshot->privatization_index);
755 void MC_restore_snapshot_fds(mc_snapshot_t snapshot)
757 if (mc_mode == MC_MODE_SERVER)
758 xbt_die("FD snapshot not implemented in client/server mode.");
761 for (int i=0; i < snapshot->total_fd; i++) {
763 new_fd = open(snapshot->current_fd[i]->filename, snapshot->current_fd[i]->flags);
765 xbt_die("Could not reopen the file %s fo restoring the file descriptor",
766 snapshot->current_fd[i]->filename);
768 if(new_fd != -1 && new_fd != snapshot->current_fd[i]->number){
769 dup2(new_fd, snapshot->current_fd[i]->number);
770 //fprintf(stderr, "%p\n", fdopen(snapshot->current_fd[i]->number, "rw"));
773 lseek(snapshot->current_fd[i]->number, snapshot->current_fd[i]->current_position, SEEK_SET);
777 void MC_restore_snapshot(mc_snapshot_t snapshot)
779 XBT_DEBUG("Restore snapshot %i", snapshot->num_state);
780 MC_restore_snapshot_regions(snapshot);
781 if (_sg_mc_snapshot_fds)
782 MC_restore_snapshot_fds(snapshot);
783 MC_snapshot_ignore_restore(snapshot);
784 mc_model_checker->process().cache_flags = 0;
787 mc_snapshot_t simcall_HANDLER_mc_snapshot(smx_simcall_t simcall)
789 return MC_take_snapshot(1);