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_model_checker->process().read_bytes(region->flat.data, size,
116 (std::uint64_t)permanent_addr,
117 simgrid::mc::ProcessIndexDisabled);
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_model_checker->process().read_bytes(
193 &privatisation_regions, sizeof(privatisation_regions),
194 (std::uint64_t)remote_smpi_privatisation_regions);
196 for (size_t i = 0; i < process_count; i++) {
197 region->privatized.regions[i] =
198 MC_region_new(region_type, start_addr,
199 privatisation_regions[i].address, size);
205 static void MC_snapshot_add_region(int index, mc_snapshot_t snapshot, mc_region_type_t type,
206 mc_object_info_t object_info,
207 void *start_addr, void* permanent_addr, size_t size)
209 if (type == MC_REGION_TYPE_DATA)
210 xbt_assert(object_info, "Missing object info for object.");
211 else if (type == MC_REGION_TYPE_HEAP)
212 xbt_assert(!object_info, "Unexpected object info for heap region.");
214 mc_mem_region_t region;
215 const bool privatization_aware = MC_object_info_is_privatized(object_info);
216 if (privatization_aware && MC_smpi_process_count())
217 region = MC_region_new_privatized(type, start_addr, permanent_addr, size);
219 region = MC_region_new(type, start_addr, permanent_addr, size);
221 region->object_info = object_info;
222 snapshot->snapshot_regions[index] = region;
226 static void MC_get_memory_regions(mc_process_t process, mc_snapshot_t snapshot)
228 const size_t n = process->object_infos_size;
229 snapshot->snapshot_regions_count = n + 1;
230 snapshot->snapshot_regions = xbt_new0(mc_mem_region_t, n + 1);
232 for (size_t i = 0; i!=n; ++i) {
233 mc_object_info_t object_info = process->object_infos[i];
234 MC_snapshot_add_region(i, snapshot, MC_REGION_TYPE_DATA, object_info,
235 object_info->start_rw, object_info->start_rw,
236 object_info->end_rw - object_info->start_rw);
239 xbt_mheap_t heap = MC_process_get_heap(process);
240 void *start_heap = heap->base;
241 void *end_heap = heap->breakval;
243 MC_snapshot_add_region(n, snapshot, MC_REGION_TYPE_HEAP, NULL,
244 start_heap, start_heap,
245 (char *) end_heap - (char *) start_heap);
246 snapshot->heap_bytes_used = mmalloc_get_bytes_used_remote(
248 MC_process_get_malloc_info(process));
251 if (smpi_privatize_global_variables && MC_smpi_process_count()) {
252 // snapshot->privatization_index = smpi_loaded_page
253 MC_process_read_variable(&mc_model_checker->process(),
254 "smpi_loaded_page", &snapshot->privatization_index,
255 sizeof(snapshot->privatization_index));
259 snapshot->privatization_index = simgrid::mc::ProcessIndexMissing;
263 /** \brief Fills the position of the segments (executable, read-only, read/write).
265 * `dl_iterate_phdr` would be more robust but would not work in cross-process.
267 void MC_find_object_address(memory_map_t maps, mc_object_info_t result)
271 const char *name = basename(result->file_name);
272 while (i < maps->mapsize) {
273 reg = maps->regions[i];
274 if (maps->regions[i].pathname == NULL
275 || strcmp(basename(maps->regions[i].pathname), name)) {
277 } else if ((reg.prot & PROT_WRITE)) {
278 xbt_assert(!result->start_rw,
279 "Multiple read-write segments for %s, not supported",
280 maps->regions[i].pathname);
281 result->start_rw = (char*) reg.start_addr;
282 result->end_rw = (char*) reg.end_addr;
283 // .bss is usually after the .data:
284 s_map_region_t *next = &(maps->regions[i + 1]);
285 if (next->pathname == NULL && (next->prot & PROT_WRITE)
286 && next->start_addr == reg.end_addr) {
287 result->end_rw = (char*) maps->regions[i + 1].end_addr;
289 } else if ((reg.prot & PROT_READ) && (reg.prot & PROT_EXEC)) {
290 xbt_assert(!result->start_exec,
291 "Multiple executable segments for %s, not supported",
292 maps->regions[i].pathname);
293 result->start_exec = (char*) reg.start_addr;
294 result->end_exec = (char*) reg.end_addr;
295 } else if ((reg.prot & PROT_READ) && !(reg.prot & PROT_EXEC)) {
296 xbt_assert(!result->start_ro,
297 "Multiple read only segments for %s, not supported",
298 maps->regions[i].pathname);
299 result->start_ro = (char*) reg.start_addr;
300 result->end_ro = (char*) reg.end_addr;
305 result->start = result->start_rw;
306 if ((const void*) result->start_ro > result->start)
307 result->start = result->start_ro;
308 if ((const void*) result->start_exec > result->start)
309 result->start = result->start_exec;
311 result->end = result->end_rw;
312 if (result->end_ro && (const void*) result->end_ro < result->end)
313 result->end = result->end_ro;
314 if (result->end_exec && (const void*) result->end_exec > result->end)
315 result->end = result->end_exec;
317 xbt_assert(result->file_name);
318 xbt_assert(result->start_rw);
319 xbt_assert(result->start_exec);
322 /************************************* Take Snapshot ************************************/
323 /****************************************************************************************/
325 /** \brief Checks whether the variable is in scope for a given IP.
327 * A variable may be defined only from a given value of IP.
329 * \param var Variable description
330 * \param frame Scope description
331 * \param ip Instruction pointer
332 * \return true if the variable is valid
334 static bool mc_valid_variable(dw_variable_t var, dw_frame_t scope,
337 // The variable is not yet valid:
338 if ((const void *) ((const char *) scope->low_pc + var->start_scope) > ip)
344 static void mc_fill_local_variables_values(mc_stack_frame_t stack_frame,
345 dw_frame_t scope, int process_index, xbt_dynar_t result)
347 mc_process_t process = &mc_model_checker->process();
349 void *ip = (void *) stack_frame->ip;
350 if (ip < scope->low_pc || ip >= scope->high_pc)
354 dw_variable_t current_variable;
355 xbt_dynar_foreach(scope->variables, cursor, current_variable) {
357 if (!mc_valid_variable(current_variable, scope, (void *) stack_frame->ip))
361 // FIXME, get rid of `region_type`
362 if ((long) stack_frame->ip > (long) process->libsimgrid_info->start_exec)
367 local_variable_t new_var = xbt_new0(s_local_variable_t, 1);
368 new_var->subprogram = stack_frame->frame;
369 new_var->ip = stack_frame->ip;
370 new_var->name = xbt_strdup(current_variable->name);
371 new_var->type = current_variable->type;
372 new_var->region = region_type;
374 if (current_variable->address != NULL) {
375 new_var->address = current_variable->address;
376 } else if (current_variable->locations.size != 0) {
377 s_mc_location_t location;
378 mc_dwarf_resolve_locations(
379 &location, ¤t_variable->locations,
380 current_variable->object_info,
381 &(stack_frame->unw_cursor),
382 (void *) stack_frame->frame_base,
383 &mc_model_checker->process(), process_index);
385 switch(mc_get_location_type(&location)) {
386 case MC_LOCATION_TYPE_ADDRESS:
387 new_var->address = location.memory_location;
389 case MC_LOCATION_TYPE_REGISTER:
391 xbt_die("Cannot handle non-address variable");
395 xbt_die("No address");
398 xbt_dynar_push(result, &new_var);
401 // Recursive processing of nested scopes:
402 dw_frame_t nested_scope = NULL;
403 xbt_dynar_foreach(scope->scopes, cursor, nested_scope) {
404 mc_fill_local_variables_values(stack_frame, nested_scope, process_index, result);
408 static xbt_dynar_t MC_get_local_variables_values(xbt_dynar_t stack_frames, int process_index)
411 unsigned cursor1 = 0;
412 mc_stack_frame_t stack_frame;
413 xbt_dynar_t variables =
414 xbt_dynar_new(sizeof(local_variable_t), local_variable_free_voidp);
416 xbt_dynar_foreach(stack_frames, cursor1, stack_frame) {
417 mc_fill_local_variables_values(stack_frame, stack_frame->frame, process_index, variables);
423 static void MC_stack_frame_free_voipd(void *s)
425 mc_stack_frame_t stack_frame = *(mc_stack_frame_t *) s;
427 xbt_free(stack_frame->frame_name);
428 xbt_free(stack_frame);
432 static xbt_dynar_t MC_unwind_stack_frames(mc_unw_context_t stack_context)
434 mc_process_t process = &mc_model_checker->process();
436 xbt_dynar_new(sizeof(mc_stack_frame_t), MC_stack_frame_free_voipd);
440 // TODO, check condition check (unw_init_local==0 means end of frame)
441 if (mc_unw_init_cursor(&c, stack_context) != 0) {
443 xbt_die("Could not initialize stack unwinding");
448 mc_stack_frame_t stack_frame = xbt_new(s_mc_stack_frame_t, 1);
449 xbt_dynar_push(result, &stack_frame);
451 stack_frame->unw_cursor = c;
455 unw_get_reg(&c, UNW_REG_IP, &ip);
456 unw_get_reg(&c, UNW_REG_SP, &sp);
458 stack_frame->ip = ip;
459 stack_frame->sp = sp;
461 // TODO, use real addresses in frame_t instead of fixing it here
463 dw_frame_t frame = MC_process_find_function(process, (void *) ip);
464 stack_frame->frame = frame;
467 stack_frame->frame_name = xbt_strdup(frame->name);
468 stack_frame->frame_base =
469 (unw_word_t) mc_find_frame_base(frame, frame->object_info, &c);
471 stack_frame->frame_base = 0;
472 stack_frame->frame_name = NULL;
475 /* Stop before context switch with maestro */
476 if (frame != NULL && frame->name != NULL
477 && !strcmp(frame->name, "smx_ctx_sysv_wrapper"))
480 int ret = unw_step(&c);
482 xbt_die("Unexpected end of stack.");
483 } else if (ret < 0) {
484 xbt_die("Error while unwinding stack");
488 if (xbt_dynar_length(result) == 0) {
489 XBT_INFO("unw_init_local failed");
496 static xbt_dynar_t MC_take_snapshot_stacks(mc_snapshot_t * snapshot)
500 xbt_dynar_new(sizeof(s_mc_snapshot_stack_t),
501 MC_snapshot_stack_free_voidp);
503 unsigned int cursor = 0;
504 stack_region_t current_stack;
506 // FIXME, cross-process support (stack_areas)
507 xbt_dynar_foreach(stacks_areas, cursor, current_stack) {
508 mc_snapshot_stack_t st = xbt_new(s_mc_snapshot_stack_t, 1);
510 // Read the context from remote process:
511 unw_context_t context;
512 mc_model_checker->process().read_bytes(
513 &context, sizeof(context), (std::uint64_t) current_stack->context);
515 st->context = xbt_new0(s_mc_unw_context_t, 1);
516 if (mc_unw_init_context(st->context, &mc_model_checker->process(),
518 xbt_die("Could not initialise the libunwind context.");
521 st->stack_frames = MC_unwind_stack_frames(st->context);
522 st->local_variables = MC_get_local_variables_values(st->stack_frames, current_stack->process_index);
523 st->process_index = current_stack->process_index;
525 unw_word_t sp = xbt_dynar_get_as(st->stack_frames, 0, mc_stack_frame_t)->sp;
527 xbt_dynar_push(res, &st);
528 (*snapshot)->stack_sizes = (size_t*)
529 xbt_realloc((*snapshot)->stack_sizes, (cursor + 1) * sizeof(size_t));
530 (*snapshot)->stack_sizes[cursor] =
531 (char*) current_stack->address + current_stack->size - (char*) sp;
538 static xbt_dynar_t MC_take_snapshot_ignore()
541 if (mc_heap_comparison_ignore == NULL)
545 xbt_dynar_new(sizeof(mc_heap_ignore_region_t),
546 heap_ignore_region_free_voidp);
548 unsigned int cursor = 0;
549 mc_heap_ignore_region_t current_region;
551 xbt_dynar_foreach(mc_heap_comparison_ignore, cursor, current_region) {
552 mc_heap_ignore_region_t new_region = NULL;
553 new_region = xbt_new0(s_mc_heap_ignore_region_t, 1);
554 new_region->address = current_region->address;
555 new_region->size = current_region->size;
556 new_region->block = current_region->block;
557 new_region->fragment = current_region->fragment;
558 xbt_dynar_push(cpy, &new_region);
565 static void mc_free_snapshot_ignored_data_pvoid(void* data) {
566 mc_snapshot_ignored_data_t ignored_data = (mc_snapshot_ignored_data_t) data;
567 free(ignored_data->data);
570 static void MC_snapshot_handle_ignore(mc_snapshot_t snapshot)
572 xbt_assert(snapshot->process);
573 snapshot->ignored_data = xbt_dynar_new(sizeof(s_mc_snapshot_ignored_data_t), mc_free_snapshot_ignored_data_pvoid);
576 unsigned int cursor = 0;
577 mc_checkpoint_ignore_region_t region;
578 xbt_dynar_foreach (mc_model_checker->process().checkpoint_ignore, cursor, region) {
579 s_mc_snapshot_ignored_data_t ignored_data;
580 ignored_data.start = region->addr;
581 ignored_data.size = region->size;
582 ignored_data.data = malloc(region->size);
583 // TODO, we should do this once per privatization segment:
584 snapshot->process->read_bytes(
585 ignored_data.data, region->size, (std::uint64_t) region->addr,
586 simgrid::mc::ProcessIndexDisabled);
587 xbt_dynar_push(snapshot->ignored_data, &ignored_data);
591 xbt_dynar_foreach (mc_model_checker->process().checkpoint_ignore, cursor, region) {
592 MC_process_clear_memory(snapshot->process, region->addr, region->size);
597 static void MC_snapshot_ignore_restore(mc_snapshot_t snapshot)
599 unsigned int cursor = 0;
600 s_mc_snapshot_ignored_data_t ignored_data;
601 xbt_dynar_foreach (snapshot->ignored_data, cursor, ignored_data) {
602 MC_process_write(snapshot->process,
603 ignored_data.data, ignored_data.start, ignored_data.size);
607 static void MC_get_current_fd(mc_snapshot_t snapshot)
610 snapshot->total_fd = 0;
612 const size_t fd_dir_path_size = 20;
613 char fd_dir_path[fd_dir_path_size];
614 int res = snprintf(fd_dir_path, fd_dir_path_size,
615 "/proc/%lli/fd", (long long int) snapshot->process->pid);
616 xbt_assert(res >= 0);
617 if ((size_t) res > fd_dir_path_size)
618 xbt_die("Unexpected buffer is too small for fd_dir_path");
620 DIR* fd_dir = opendir(fd_dir_path);
622 xbt_die("Cannot open directory '/proc/self/fd'\n");
625 struct dirent* fd_number;
626 while ((fd_number = readdir(fd_dir))) {
628 int fd_value = atoi(fd_number->d_name);
633 const size_t source_size = 25;
635 int res = snprintf(source, source_size, "/proc/%lli/fd/%s",
636 (long long int) snapshot->process->pid, fd_number->d_name);
637 xbt_assert(res >= 0);
638 if ((size_t) res > source_size)
639 xbt_die("Unexpected buffer is too small for fd %s", fd_number->d_name);
641 const size_t link_size = 200;
643 res = readlink(source, link, link_size);
645 xbt_die("Could not read link for %s", source);
648 xbt_die("Buffer to small for link of %s", source);
652 if(smpi_is_privatisation_file(link))
655 // This is (probably) the DIR* we are reading:
656 // TODO, read all the file entries at once and close the DIR.*
657 if(strcmp(fd_dir_path, link) == 0)
660 // We don't handle them.
661 // It does not mean we should silently ignore them however.
662 if (strncmp(link, "pipe:", 5) == 0 || strncmp(link, "socket:", 7) == 0)
665 // If dot_output enabled, do not handle the corresponding file
666 if (dot_output != NULL && strcmp(basename(link), _sg_mc_dot_output_file) == 0)
669 // This is probably a shared memory used by lttng-ust:
670 if(strncmp("/dev/shm/ust-shm-tmp-", link, 21)==0)
673 // Add an entry for this FD in the snapshot:
674 fd_infos_t fd = xbt_new0(s_fd_infos_t, 1);
675 fd->filename = strdup(link);
676 fd->number = fd_value;
677 fd->flags = fcntl(fd_value, F_GETFL) | fcntl(fd_value, F_GETFD) ;
678 fd->current_position = lseek(fd_value, 0, SEEK_CUR);
679 snapshot->current_fd = (fd_infos_t*) xbt_realloc(snapshot->current_fd, (total_fd + 1) * sizeof(fd_infos_t));
680 snapshot->current_fd[total_fd] = fd;
684 snapshot->total_fd = total_fd;
688 mc_snapshot_t MC_take_snapshot(int num_state)
690 XBT_DEBUG("Taking snapshot %i", num_state);
692 mc_process_t mc_process = &mc_model_checker->process();
694 mc_snapshot_t snapshot = new simgrid::mc::Snapshot();
696 snapshot->process = mc_process;
697 snapshot->num_state = num_state;
699 snapshot->enabled_processes = xbt_dynar_new(sizeof(int), NULL);
701 smx_process_t process;
702 MC_EACH_SIMIX_PROCESS(process,
703 xbt_dynar_push_as(snapshot->enabled_processes, int, (int)process->pid));
705 MC_snapshot_handle_ignore(snapshot);
707 if (_sg_mc_snapshot_fds)
708 MC_get_current_fd(snapshot);
710 /* Save the std heap and the writable mapped pages of libsimgrid and binary */
711 MC_get_memory_regions(mc_process, snapshot);
713 snapshot->to_ignore = MC_take_snapshot_ignore();
715 if (_sg_mc_visited > 0 || strcmp(_sg_mc_property_file, "")) {
717 MC_take_snapshot_stacks(&snapshot);
718 if (_sg_mc_hash && snapshot->stacks != NULL) {
719 snapshot->hash = mc_hash_processes_state(num_state, snapshot->stacks);
727 MC_snapshot_ignore_restore(snapshot);
732 void MC_restore_snapshot_regions(mc_snapshot_t snapshot)
734 const size_t n = snapshot->snapshot_regions_count;
735 for (size_t i = 0; i < n; i++) {
736 // For privatized, variables we decided it was not necessary to take the snapshot:
737 if (snapshot->snapshot_regions[i])
738 MC_region_restore(snapshot->snapshot_regions[i]);
742 // TODO, send a message to implement this in the MCed process
743 if(snapshot->privatization_index >= 0) {
744 // We just rewrote the global variables.
745 // The privatisation segment SMPI thinks
746 // is mapped might be inconsistent with the segment which
747 // is really mapped in memory (kernel state).
748 // We ask politely SMPI to map the segment anyway,
749 // even if it thinks it is the current one:
750 smpi_really_switch_data_segment(snapshot->privatization_index);
756 void MC_restore_snapshot_fds(mc_snapshot_t snapshot)
758 if (mc_mode == MC_MODE_SERVER)
759 xbt_die("FD snapshot not implemented in client/server mode.");
762 for (int i=0; i < snapshot->total_fd; i++) {
764 new_fd = open(snapshot->current_fd[i]->filename, snapshot->current_fd[i]->flags);
766 xbt_die("Could not reopen the file %s fo restoring the file descriptor",
767 snapshot->current_fd[i]->filename);
769 if(new_fd != -1 && new_fd != snapshot->current_fd[i]->number){
770 dup2(new_fd, snapshot->current_fd[i]->number);
771 //fprintf(stderr, "%p\n", fdopen(snapshot->current_fd[i]->number, "rw"));
774 lseek(snapshot->current_fd[i]->number, snapshot->current_fd[i]->current_position, SEEK_SET);
778 void MC_restore_snapshot(mc_snapshot_t snapshot)
780 XBT_DEBUG("Restore snapshot %i", snapshot->num_state);
781 MC_restore_snapshot_regions(snapshot);
782 if (_sg_mc_snapshot_fds)
783 MC_restore_snapshot_fds(snapshot);
784 MC_snapshot_ignore_restore(snapshot);
785 mc_model_checker->process().cache_flags = 0;
788 mc_snapshot_t simcall_HANDLER_mc_snapshot(smx_simcall_t simcall)
790 return MC_take_snapshot(1);