still more bugfixing
[lttv.git] / ltt / branches / poly / ltt / tracefile.c
index 1b29605f5a99d01f178766da2c66792710c3abe8..fb951222740799790fe4487250739dcff2c58717 100644 (file)
@@ -71,6 +71,11 @@ GQuark LTT_TRACEFILE_NAME_FACILITIES;
 
 #define g_close close
 
+/* Those macros must be called from within a function where page_size is a known
+ * variable */
+#define PAGE_MASK (~(page_size-1))
+#define PAGE_ALIGN(addr)  (((addr)+page_size-1)&PAGE_MASK)
+
 /* obtain the time of an event */
 
 static inline LttTime getEventTime(LttTracefile * tf);
@@ -79,7 +84,7 @@ static inline LttTime getEventTime(LttTracefile * tf);
 /* set the offset of the fields belonging to the event,
    need the information of the archecture */
 void set_fields_offsets(LttTracefile *tf, LttEventType *event_type);
-size_t get_fields_offsets(LttTracefile *tf, LttEventType *event_type, void *data);
+//size_t get_fields_offsets(LttTracefile *tf, LttEventType *event_type, void *data);
 
 /* get the size of the field type according to 
  * The facility size information. */
@@ -89,13 +94,6 @@ static inline void preset_field_type_size(LttTracefile *tf,
     enum field_status *fixed_root, enum field_status *fixed_parent,
     LttField *field);
 
-
-static inline size_t get_field_type_size(LttTracefile *tf,
-    LttEventType *event_type,
-    off_t offset_root, off_t offset_parent,
-    LttField *field, void *data);
-
-
 /* map a fixed size or a block information from the file (fd) */
 static gint map_block(LttTracefile * tf, guint block_num);
 
@@ -105,6 +103,8 @@ static double calc_nsecs_per_cycle(LttTracefile * t);
 /* go to the next event */
 static int ltt_seek_next_event(LttTracefile *tf);
 
+void ltt_update_event_size(LttTracefile *tf);
+
 #if 0
 /* Functions to parse system.xml file (using glib xml parser) */
 static void parser_start_element (GMarkupParseContext  __UNUSED__ *context,
@@ -206,11 +206,12 @@ gint ltt_tracefile_open(LttTrace *t, gchar * fileName, LttTracefile *tf)
 {
   struct stat    lTDFStat;    /* Trace data file status */
   struct ltt_block_start_header *header;
+  int page_size = getpagesize();
 
   //open the file
   tf->name = g_quark_from_string(fileName);
   tf->trace = t;
-  tf->fd = g_open(fileName, O_RDONLY, 0);
+  tf->fd = open(fileName, O_RDONLY);
   if(tf->fd < 0){
     g_warning("Unable to open input data file %s\n", fileName);
     goto end;
@@ -230,13 +231,14 @@ gint ltt_tracefile_open(LttTrace *t, gchar * fileName, LttTracefile *tf)
   
   /* Temporarily map the buffer start header to get trace information */
   /* Multiple of pages aligned head */
-  tf->buffer.head = mmap(0, sizeof(struct ltt_block_start_header), PROT_READ, 
+  tf->buffer.head = mmap(0,
+      PAGE_ALIGN(sizeof(struct ltt_block_start_header)), PROT_READ, 
       MAP_PRIVATE, tf->fd, 0);
-  if(tf->buffer.head == NULL) {
+  if(tf->buffer.head == MAP_FAILED) {
     perror("Error in allocating memory for buffer of tracefile");
     goto close_file;
   }
-  g_assert(((guint)tf->buffer.head & (8-1)) == 0); // make sure it's aligned.
+  g_assert( ( (guint)tf->buffer.head&(8-1) ) == 0); // make sure it's aligned.
   
   header = (struct ltt_block_start_header*)tf->buffer.head;
   
@@ -249,10 +251,10 @@ gint ltt_tracefile_open(LttTrace *t, gchar * fileName, LttTracefile *tf)
     
   //store the size of the file
   tf->file_size = lTDFStat.st_size;
-  tf->block_size = header->buf_size;
+  tf->block_size = ltt_get_uint32(LTT_GET_BO(tf), &header->buf_size);
   tf->num_blocks = tf->file_size / tf->block_size;
 
-  vfree(tf->buffer.head);
+  munmap(tf->buffer.head, PAGE_ALIGN(sizeof(struct ltt_block_start_header)));
   tf->buffer.head = NULL;
 
   //read the first block
@@ -265,9 +267,9 @@ gint ltt_tracefile_open(LttTrace *t, gchar * fileName, LttTracefile *tf)
 
   /* Error */
 unmap_file:
-  munmap(tf->buffer.head, sizeof(struct ltt_block_start_header));
+  munmap(tf->buffer.head, PAGE_ALIGN(sizeof(struct ltt_block_start_header)));
 close_file:
-  g_close(tf->fd);
+  close(tf->fd);
 end:
   return -1;
 }
@@ -351,7 +353,7 @@ void ltt_tracefile_close(LttTracefile *t)
 {
   if(t->buffer.head != NULL)
     munmap(t->buffer.head, t->buf_size);
-  g_close(t->fd);
+  close(t->fd);
 }
 
 
@@ -542,14 +544,15 @@ int get_tracefile_name_number(const gchar *raw_name,
 }
 
 
-GData *ltt_trace_get_tracefiles_groups(LttTrace *trace)
+GData **ltt_trace_get_tracefiles_groups(LttTrace *trace)
 {
-  return trace->tracefiles;
+  return &trace->tracefiles;
 }
 
 
-void compute_tracefile_group(GArray *group,
-                             struct compute_tracefile_group_args args)
+void compute_tracefile_group(GQuark key_id,
+                             GArray *group,
+                             struct compute_tracefile_group_args *args)
 {
   int i;
   LttTracefile *tf;
@@ -557,7 +560,7 @@ void compute_tracefile_group(GArray *group,
   for(i=0; i<group->len; i++) {
     tf = &g_array_index (group, LttTracefile, i);
     if(tf->cpu_online)
-      args.func(tf, args.func_args);
+      args->func(tf, args->func_args);
   }
 }
 
@@ -594,20 +597,29 @@ gboolean ltt_tracefile_group_has_cpu_online(gpointer data)
  * GData : permits to access them using their tracefile group pathname.
  * i.e. access control/modules tracefile group by index :
  * "control/module".
+ * 
+ * relative path is the path relative to the trace root
+ * root path is the full path
  *
  * A tracefile group is simply an array where all the per cpu tracefiles sits.
  */
 
-static int open_tracefiles(LttTrace *trace, char *root_path, GData *tracefiles)
+static int open_tracefiles(LttTrace *trace, char *root_path,
+    char *relative_path)
 {
        DIR *dir = opendir(root_path);
        struct dirent *entry;
        struct stat stat_buf;
        int ret;
+  
        char path[PATH_MAX];
        int path_len;
        char *path_ptr;
 
+  int rel_path_len;
+  char rel_path[PATH_MAX];
+  char *rel_path_ptr;
+
        if(dir == NULL) {
                perror(root_path);
                return ENOENT;
@@ -619,11 +631,18 @@ static int open_tracefiles(LttTrace *trace, char *root_path, GData *tracefiles)
        path_len++;
        path_ptr = path + path_len;
 
+  strncpy(rel_path, relative_path, PATH_MAX-1);
+  rel_path_len = strlen(rel_path);
+  rel_path[rel_path_len] = '/';
+  rel_path_len++;
+  rel_path_ptr = rel_path + rel_path_len;
+  
        while((entry = readdir(dir)) != NULL) {
 
                if(entry->d_name[0] == '.') continue;
                
                strncpy(path_ptr, entry->d_name, PATH_MAX - path_len);
+               strncpy(rel_path_ptr, entry->d_name, PATH_MAX - rel_path_len);
                
                ret = stat(path, &stat_buf);
                if(ret == -1) {
@@ -636,7 +655,7 @@ static int open_tracefiles(LttTrace *trace, char *root_path, GData *tracefiles)
                if(S_ISDIR(stat_buf.st_mode)) {
 
                        g_debug("Entering subdirectory...\n");
-                       ret = open_tracefiles(trace, path, tracefiles);
+                       ret = open_tracefiles(trace, path, rel_path);
                        if(ret < 0) continue;
                } else if(S_ISREG(stat_buf.st_mode)) {
                        g_debug("Opening file.\n");
@@ -647,16 +666,19 @@ static int open_tracefiles(LttTrace *trace, char *root_path, GData *tracefiles)
       LttTracefile *tf;
       guint len;
       
-      if(get_tracefile_name_number(path, &name, &num))
+      if(get_tracefile_name_number(rel_path, &name, &num))
         continue; /* invalid name */
-
-      group = g_datalist_id_get_data(&tracefiles, name);
+      
+      g_debug("Tracefile name is %s and number is %u", 
+          g_quark_to_string(name), num);
+      
+      group = g_datalist_id_get_data(&trace->tracefiles, name);
       if(group == NULL) {
         /* Elements are automatically cleared when the array is allocated.
          * It makes the cpu_online variable set to 0 : cpu offline, by default.
          */
         group = g_array_sized_new (FALSE, TRUE, sizeof(LttTracefile), 10);
-        g_datalist_id_set_data_full(&tracefiles, name,
+        g_datalist_id_set_data_full(&trace->tracefiles, name,
                                  group, ltt_tracefile_group_destroy);
       }
       /* Add the per cpu tracefile to the named group */
@@ -670,7 +692,7 @@ static int open_tracefiles(LttTrace *trace, char *root_path, GData *tracefiles)
         g_array_set_size(group, old_len);
 
         if(!ltt_tracefile_group_has_cpu_online(group))
-          g_datalist_id_remove_data(&tracefiles, name);
+          g_datalist_id_remove_data(&trace->tracefiles, name);
 
         continue; /* error opening the tracefile : bad magic number ? */
       }
@@ -728,7 +750,7 @@ static int ltt_get_facility_description(LttFacility *f,
 
   err = snprintf(desc_file_name+textlen, PATH_MAX-textlen-1,
       "%u", f->checksum);
-  if(err) goto name_error;
+  if(err < 0) goto name_error;
 
   textlen=strlen(desc_file_name);
   
@@ -798,28 +820,30 @@ static int ltt_process_facility_tracefile(LttTracefile *tf)
      *  0 : facility load
      *  1 : facility unload
      *  2 : state dump facility load
-     * Facility 1 : (heartbeat)
-     *  0 : heartbeat
+     *  3 : heartbeat
      */
-    if(tf->event.facility_id > 1) { /* Should only contain core and heartbeat
-                                       facilities */
+    if(tf->event.facility_id != LTT_FACILITY_CORE) {
+      /* Should only contain core facility */
       g_warning("Error in processing facility file %s, "
           "should not contain facility id  %u.", g_quark_to_string(tf->name),
           tf->event.facility_id);
       err = EPERM;
       goto fac_id_error;
-    } else if(tf->event.facility_id == LTT_FACILITY_CORE) {
+    } else {
     
       struct LttFacilityLoad *fac_load_data;
+      struct LttStateDumpFacilityLoad *fac_state_dump_load_data;
       char *fac_name;
 
       // FIXME align
       switch((enum ltt_core_events)tf->event.event_id) {
         case LTT_EVENT_FACILITY_LOAD:
+          fac_name = (char*)(tf->event.data);
+          g_debug("Doing LTT_EVENT_FACILITY_LOAD of facility %s",
+              fac_name);
           fac_load_data =
-            (struct LttFacilityLoad *)tf->event.data;
-          fac_name = 
-            (char*)(tf->event.data + sizeof(struct LttFacilityLoad));
+            (struct LttFacilityLoad *)
+                (tf->event.data + strlen(fac_name) + 1);
           fac = &g_array_index (tf->trace->facilities_by_num, LttFacility,
               ltt_get_uint32(LTT_GET_BO(tf), &fac_load_data->id));
           g_assert(fac->exists == 0);
@@ -829,7 +853,7 @@ static int ltt_process_facility_tracefile(LttTracefile *tf)
           fac->id = ltt_get_uint32(LTT_GET_BO(tf), &fac_load_data->id);
           fac->pointer_size = ltt_get_uint32(LTT_GET_BO(tf),
                           &fac_load_data->pointer_size);
-          fac->size_t_size = ltt_get_uin32(LTT_GET_BO(tf),
+          fac->size_t_size = ltt_get_uint32(LTT_GET_BO(tf),
                           &fac_load_data->size_t_size);
           fac->alignment = ltt_get_uint32(LTT_GET_BO(tf),
                           &fac_load_data->alignment);
@@ -852,27 +876,30 @@ static int ltt_process_facility_tracefile(LttTracefile *tf)
 
           break;
         case LTT_EVENT_FACILITY_UNLOAD:
+          g_debug("Doing LTT_EVENT_FACILITY_UNLOAD");
           /* We don't care about unload : facilities ID are valid for the whole
            * trace. They simply won't be used after the unload. */
           break;
         case LTT_EVENT_STATE_DUMP_FACILITY_LOAD:
-          fac_load_data =
-            (struct LttFacilityLoad *)tf->event.data;
-          fac_name = 
-            (char*)(tf->event.data + sizeof(struct LttFacilityLoad));
+          fac_name = (char*)(tf->event.data);
+          g_debug("Doing LTT_EVENT_STATE_DUMP_FACILITY_LOAD of facility %s",
+              fac_name);
+          fac_state_dump_load_data =
+            (struct LttStateDumpFacilityLoad *)
+                (tf->event.data + strlen(fac_name) + 1);
           fac = &g_array_index (tf->trace->facilities_by_num, LttFacility,
-              ltt_get_uint32(LTT_GET_BO(tf), &fac_load_data->id));
+              ltt_get_uint32(LTT_GET_BO(tf), &fac_state_dump_load_data->id));
           g_assert(fac->exists == 0);
           fac->name = g_quark_from_string(fac_name);
           fac->checksum = ltt_get_uint32(LTT_GET_BO(tf),
-                          &fac_load_data->checksum);
-          fac->id = ltt_get_uint8(LTT_GET_BO(tf), &fac_load_data->id);
+                          &fac_state_dump_load_data->checksum);
+          fac->id = fac_state_dump_load_data->id;
           fac->pointer_size = ltt_get_uint32(LTT_GET_BO(tf),
-                          &fac_load_data->pointer_size);
-          fac->size_t_size = ltt_get_uin32(LTT_GET_BO(tf),
-                          &fac_load_data->size_t_size);
+                          &fac_state_dump_load_data->pointer_size);
+          fac->size_t_size = ltt_get_uint32(LTT_GET_BO(tf),
+                          &fac_state_dump_load_data->size_t_size);
           fac->alignment = ltt_get_uint32(LTT_GET_BO(tf),
-                          &fac_load_data->alignment);
+                          &fac_state_dump_load_data->alignment);
           if(ltt_get_facility_description(fac, tf->trace, tf))
             goto facility_error;
           
@@ -911,6 +938,7 @@ event_id_error:
 fac_id_error:
 update_error:
 seek_error:
+  g_warning("An error occured in facility tracefile parsing");
   return err;
 }
 
@@ -922,6 +950,7 @@ LttTrace *ltt_trace_open(const gchar *pathname)
   LttTracefile *tf;
   GArray *group;
   int i;
+  struct ltt_block_start_header *header;
   
   t = g_new(LttTrace, 1);
   if(!t) goto alloc_error;
@@ -931,7 +960,7 @@ LttTrace *ltt_trace_open(const gchar *pathname)
 
   /* Open all the tracefiles */
   g_datalist_init(&t->tracefiles);
-  if(open_tracefiles(t, abs_path, t->tracefiles))
+  if(open_tracefiles(t, abs_path, ""))
     goto open_error;
   
   /* Prepare the facilities containers : array and mapping */
@@ -947,16 +976,30 @@ LttTrace *ltt_trace_open(const gchar *pathname)
   group = g_datalist_id_get_data(&t->tracefiles, LTT_TRACEFILE_NAME_FACILITIES);
   if(group == NULL) {
     g_error("Trace %s has no facility tracefile", abs_path);
+    g_assert(0);
     goto facilities_error;
   }
 
+  /* Get the trace information for the control/facility 0 tracefile */
+  g_assert(group->len > 0);
+  tf = &g_array_index (group, LttTracefile, 0);
+  header = (struct ltt_block_start_header*)tf->buffer.head;
+  t->arch_type = ltt_get_uint32(LTT_GET_BO(tf), &header->trace.arch_type);
+  t->arch_variant = ltt_get_uint32(LTT_GET_BO(tf), &header->trace.arch_variant);
+  t->arch_size = header->trace.arch_size;
+  t->ltt_major_version = header->trace.major_version;
+  t->ltt_minor_version = header->trace.minor_version;
+  t->flight_recorder = header->trace.flight_recorder;
+  t->has_heartbeat = header->trace.has_heartbeat;
+  t->has_alignment = header->trace.has_alignment;
+  t->has_tsc = header->trace.has_tsc;
+  
+  
   for(i=0; i<group->len; i++) {
     tf = &g_array_index (group, LttTracefile, i);
     if(ltt_process_facility_tracefile(tf))
       goto facilities_error;
   }
-
-  
   
   return t;
 
@@ -1323,6 +1366,15 @@ LttTime ltt_interpolate_time(LttTracefile *tf, LttEvent *event)
   return time;
 }
 
+
+/* Get the current event of the tracefile : valid until the next read */
+LttEvent *ltt_tracefile_get_event(LttTracefile *tf)
+{
+  return &tf->event;
+}
+
+
+
 /*****************************************************************************
  *Function name
  *    ltt_tracefile_read : Read the next event in the tracefile
@@ -1419,32 +1471,37 @@ int ltt_tracefile_read_update_event(LttTracefile *tf)
   LttEvent *event;
  
   event = &tf->event;
-  pos = event->offset;
+  pos = tf->buffer.head + event->offset;
 
   /* Read event header */
   
   //TODO align
   
   if(tf->trace->has_tsc) {
-    event->time.timestamp = ltt_get_uint32(LTT_GET_BO(tf),
-                                          pos);
-    /* 32 bits -> 64 bits tsc */
-    /* note : still works for seek and non seek cases. */
-    if(event->time.timestamp < (0xFFFFFFFFULL&tf->buffer.tsc)) {
-      tf->buffer.tsc = ((tf->buffer.tsc&0xFFFFFFFF00000000ULL)
-                          + 0x100000000ULL)
-                              | (guint64)event->time.timestamp;
-      event->tsc = tf->buffer.tsc;
+    if(tf->trace->has_heartbeat) {
+      event->time.timestamp = ltt_get_uint32(LTT_GET_BO(tf),
+                                            pos);
+      /* 32 bits -> 64 bits tsc */
+      /* note : still works for seek and non seek cases. */
+      if(event->time.timestamp < (0xFFFFFFFFULL&tf->buffer.tsc)) {
+        tf->buffer.tsc = ((tf->buffer.tsc&0xFFFFFFFF00000000ULL)
+                            + 0x100000000ULL)
+                                | (guint64)event->time.timestamp;
+        event->tsc = tf->buffer.tsc;
+      } else {
+        /* no overflow */
+        tf->buffer.tsc = (tf->buffer.tsc&0xFFFFFFFF00000000ULL) 
+                                | (guint64)event->time.timestamp;
+        event->tsc = tf->buffer.tsc;
+      }
+      pos += sizeof(guint32);
     } else {
-      /* no overflow */
-      tf->buffer.tsc = (tf->buffer.tsc&0xFFFFFFFF00000000ULL) 
-                              | (guint64)event->time.timestamp;
-      event->tsc = tf->buffer.tsc;
+      event->tsc = ltt_get_uint64(LTT_GET_BO(tf), pos);
+      tf->buffer.tsc = event->tsc;
+      pos += sizeof(guint64);
     }
-
+    
     event->event_time = ltt_interpolate_time(tf, event);
-
-    pos += sizeof(guint32);
   } else {
     event->time.delta.tv_sec = 0;
     event->time.delta.tv_nsec = ltt_get_uint32(LTT_GET_BO(tf),
@@ -1457,19 +1514,20 @@ int ltt_tracefile_read_update_event(LttTracefile *tf)
     pos += sizeof(guint32);
   }
 
-  event->facility_id = ltt_get_uint8(LTT_GET_BO(tf),
-                                                                                                       pos);
+  event->facility_id = *(guint8*)pos;
   pos += sizeof(guint8);
 
-  event->event_id = ltt_get_uint8(LTT_GET_BO(tf),
-                                                                                                       pos);
+  event->event_id = *(guint8*)pos;
   pos += sizeof(guint8);
 
+  event->event_size = ltt_get_uint16(LTT_GET_BO(tf), pos);
+  pos += sizeof(guint16);
+  
   event->data = pos;
 
   /* get the data size and update the event fields with the current
    * information */
-  event->data_size = ltt_update_event_size(tf);
+  ltt_update_event_size(tf);
 
   return 0;
 }
@@ -1489,22 +1547,26 @@ int ltt_tracefile_read_update_event(LttTracefile *tf)
 
 static gint map_block(LttTracefile * tf, guint block_num)
 {
+  int page_size = getpagesize();
   struct ltt_block_start_header *header;
 
   g_assert(block_num < tf->num_blocks);
 
   if(tf->buffer.head != NULL)
-    munmap(tf->buffer.head, tf->buf_size);
+    munmap(tf->buffer.head, PAGE_ALIGN(tf->buf_size));
   
   /* Multiple of pages aligned head */
-  tf->buffer.head = mmap(0, tf->block_size, PROT_READ, tf->fd, MAP_PRIVATE,
-                            (off_t)tf->block_size * (off_t)block_num);
+  tf->buffer.head = mmap(0,
+      PAGE_ALIGN(tf->block_size),
+      PROT_READ, MAP_PRIVATE, tf->fd,
+      PAGE_ALIGN((off_t)tf->block_size * (off_t)block_num));
 
-  if(tf->buffer.head == NULL) {
+  if(tf->buffer.head == MAP_FAILED) {
     perror("Error in allocating memory for buffer of tracefile");
+    g_assert(0);
     goto map_error;
   }
-  g_assert(((guint)tf->buffer.head) & (8-1) == 0); // make sure it's aligned.
+  g_assert( ( (guint)tf->buffer.head&(8-1) ) == 0); // make sure it's aligned.
   
 
   tf->buffer.index = block_num;
@@ -1542,7 +1604,7 @@ static gint map_block(LttTracefile * tf, guint block_num)
    * it means that the event read must get the first event. */
   tf->event.tracefile = tf;
   tf->event.block = block_num;
-  tf->event.offset = tf->buffer.head;
+  tf->event.offset = 0;
   
   return 0;
 
@@ -1561,39 +1623,72 @@ void ltt_update_event_size(LttTracefile *tf)
   LttFacility *f = ltt_trace_get_facility_by_num(tf->trace, 
                                           tf->event.facility_id);
 
-  if(unlikely(f == NULL)) {
-    if(likely(tf->event.facility_id == LTT_FACILITY_CORE)) {
-      switch((enum ltt_core_events)tf->event.event_id) {
-    case LTT_EVENT_FACILITY_LOAD:
-      size = sizeof(struct LttFacilityLoad);
-      break;
-    case LTT_EVENT_FACILITY_UNLOAD:
-      size = sizeof(struct LttFacilityUnload);
-      break;
-    case LTT_EVENT_STATE_DUMP_FACILITY_LOAD:
-      size = sizeof(struct LttStateDumpFacilityLoad);
-      break;
-    case LTT_EVENT_HEARTBEAT:
-      size = sizeof(TimeHeartbeat);
-      break;
-    default:
-      g_warning("Error in getting event size : tracefile %s, "
-          "unknown event id %hhu in core facility.",
-          g_quark_to_string(tf->name),
-          tf->event.event_id);
-      goto event_id_error;
+  if(likely(tf->event.facility_id == LTT_FACILITY_CORE)) {
+    switch((enum ltt_core_events)tf->event.event_id) {
+  case LTT_EVENT_FACILITY_LOAD:
+    size = strlen((char*)tf->event.data) + 1;
+    g_debug("Update Event facility load of facility %s", (char*)tf->event.data);
+    size += sizeof(struct LttFacilityLoad);
+    break;
+  case LTT_EVENT_FACILITY_UNLOAD:
+    g_debug("Update Event facility unload");
+    size = sizeof(struct LttFacilityUnload);
+    break;
+  case LTT_EVENT_STATE_DUMP_FACILITY_LOAD:
+    size = strlen((char*)tf->event.data) + 1;
+    g_debug("Update Event facility load state dump of facility %s",
+        (char*)tf->event.data);
+    size += sizeof(struct LttStateDumpFacilityLoad);
+    break;
+  case LTT_EVENT_HEARTBEAT:
+    g_debug("Update Event heartbeat");
+    size = sizeof(TimeHeartbeat);
+    break;
+  default:
+    g_warning("Error in getting event size : tracefile %s, "
+        "unknown event id %hhu in core facility.",
+        g_quark_to_string(tf->name),
+        tf->event.event_id);
+    goto event_id_error;
 
-      }
     }
   } else {
+    if(!f->exists) {
+      g_error("Unknown facility %hhu (0x%hhx) in tracefile %s",
+          tf->event.facility_id,
+          tf->event.facility_id,
+          g_quark_to_string(tf->name));
+      goto facility_error;
+    }
+
     LttEventType *event_type = 
       ltt_facility_eventtype_get(f, tf->event.event_id);
-    size = get_fields_offsets(tf, event_type, tf->event.data);
+
+    if(!event_type) {
+      g_error("Unknown event id %hhu in facility %s in tracefile %s",
+          tf->event.event_id,
+          g_quark_to_string(f->name),
+          g_quark_to_string(tf->name));
+      goto event_type_error;
+    }
+
+    size = get_field_type_size(tf, event_type,
+        0, 0, event_type->root_field, tf->event.data);
+    g_debug("Event root field : f.e %hhu.%hhu size %lu", tf->event.facility_id,
+        tf->event.event_id, size);
   }
   
   tf->event.data_size = size;
+  
+  /* Check consistency between kernel and LTTV structure sizes */
+  g_assert(tf->event.data_size == tf->event.event_size);
+  
+  return;
+
+facility_error:
+event_type_error:
 event_id_error:
-  return -1;
+  tf->event.data_size = 0;
 }
 
 
@@ -1615,13 +1710,17 @@ static int ltt_seek_next_event(LttTracefile *tf)
   ssize_t event_size;
   
   /* seek over the buffer header if we are at the buffer start */
-  if(tf->event.offset == tf->buffer.head) {
+  if(tf->event.offset == 0) {
     tf->event.offset += sizeof(struct ltt_block_start_header);
+
+    if(tf->event.offset == tf->block_size - tf->buffer.lost_size) {
+      ret = ERANGE;
+    }
     goto found;
   }
 
   
-  if(tf->event.offset == tf->buffer.head + tf->buffer.lost_size) {
+  if(tf->event.offset == tf->block_size - tf->buffer.lost_size) {
     ret = ERANGE;
     goto found;
   }
@@ -1632,7 +1731,7 @@ static int ltt_seek_next_event(LttTracefile *tf)
 
   pos += (size_t)tf->event.data_size;
   
-  tf->event.offset = pos;
+  tf->event.offset = pos - tf->buffer.head;
 
 found:
   return ret;
@@ -1858,136 +1957,6 @@ void preset_field_type_size(LttTracefile *tf, LttEventType *event_type,
 }
 
 
-/*****************************************************************************
- *Function name
- *    get_field_type_size : set the fixed and dynamic sizes of the field type
- *    from the data read.
- *Input params 
- *    tf              : tracefile
- *    event_type      : event type
- *    offset_root     : offset from the root
- *    offset_parent   : offset from the parent
- *    field           : field
- *    data            : a pointer to the event data.
- *Returns the field type size.
- ****************************************************************************/
-size_t get_field_type_size(LttTracefile *tf, LttEventType *event_type,
-    off_t offset_root, off_t offset_parent,
-    LttField *field, void *data)
-{
-  size_t size = 0;
-  guint i;
-  LttType *type;
-  
-  g_assert(field->fixed_root != FIELD_UNKNOWN);
-  g_assert(field->fixed_parent != FIELD_UNKNOWN);
-  g_assert(field->fixed_size != FIELD_UNKNOWN);
-
-  field->offset_root = offset_root;
-  field->offset_parent = offset_parent;
-  
-  type = field->field_type;
-
-  switch(type->type_class) {
-    case LTT_INT:
-    case LTT_UINT:
-    case LTT_FLOAT:
-    case LTT_ENUM:
-    case LTT_POINTER:
-    case LTT_LONG:
-    case LTT_ULONG:
-    case LTT_SIZE_T:
-    case LTT_SSIZE_T:
-    case LTT_OFF_T:
-      g_assert(field->fixed_size == FIELD_FIXED);
-      size = field->field_size;
-      break;
-    case LTT_SEQUENCE:
-      {
-        gint seqnum = ltt_get_uint(LTT_GET_BO(tf),
-                        field->sequ_number_size,
-                        data + offset_root);
-
-        if(field->child[0]->fixed_size == FIELD_FIXED) {
-          size = field->sequ_number_size + 
-            (seqnum * get_field_type_size(tf, event_type,
-                                          offset_root, offset_parent,
-                                          field->child[0], data));
-        } else {
-          size += field->sequ_number_size;
-          for(i=0;i<seqnum;i++) {
-            size_t child_size;
-            child_size = get_field_type_size(tf, event_type,
-                                    offset_root, offset_parent,
-                                    field->child[0], data);
-            offset_root += child_size;
-            offset_parent += child_size;
-            size += child_size;
-          }
-        }
-        field->field_size = size;
-      }
-      break;
-    case LTT_STRING:
-      size = strlen((char*)(data+offset_root)) + 1;// length + \0
-      field->field_size = size;
-      break;
-    case LTT_ARRAY:
-      if(field->fixed_size == FIELD_FIXED)
-        size = field->field_size;
-      else {
-        for(i=0;i<field->field_type->element_number;i++) {
-          size_t child_size;
-          child_size = get_field_type_size(tf, event_type,
-                                  offset_root, offset_parent,
-                                  field->child[0], data);
-          offset_root += child_size;
-          offset_parent += child_size;
-          size += child_size;
-        }
-        field->field_size = size;
-      }
-      break;
-    case LTT_STRUCT:
-      if(field->fixed_size == FIELD_FIXED)
-        size = field->field_size;
-      else {
-        size_t current_root_offset = offset_root;
-        size_t current_offset = 0;
-        size_t child_size = 0;
-        for(i=0;i<type->element_number;i++) {
-          child_size = get_field_type_size(tf,
-                     event_type, current_root_offset, current_offset, 
-                     field->child[i], data);
-          current_offset += child_size;
-          current_root_offset += child_size;
-          
-        }
-        size = current_offset;
-        field->field_size = size;
-      }
-      break;
-    case LTT_UNION:
-      if(field->fixed_size == FIELD_FIXED)
-        size = field->field_size;
-      else {
-        size_t current_root_offset = field->offset_root;
-        size_t current_offset = 0;
-        for(i=0;i<type->element_number;i++) {
-          size = get_field_type_size(tf, event_type,
-                 current_root_offset, current_offset, 
-                 field->child[i], data);
-          size = max(size, field->child[i]->field_size);
-        }
-        field->field_size = size;
-      }
-      break;
-  }
-
-  return size;
-}
-
-
 /*****************************************************************************
  *Function name
  *    check_fields_compatibility : Check for compatibility between two fields :
@@ -2290,7 +2259,7 @@ end_getFieldtypeSize:
 
 /*****************************************************************************
  *Function name
- *    get_int    : get an integer number
+ *    ltt_get_int    : get an integer number
  *Input params 
  *    reverse_byte_order: must we reverse the byte order ?
  *    size            : the size of the integer
@@ -2299,7 +2268,7 @@ end_getFieldtypeSize:
  *    gint64          : a 64 bits integer
  ****************************************************************************/
 
-gint64 get_int(gboolean reverse_byte_order, gint size, void *data)
+gint64 ltt_get_int(gboolean reverse_byte_order, gint size, void *data)
 {
   gint64 val;
 
@@ -2318,7 +2287,7 @@ gint64 get_int(gboolean reverse_byte_order, gint size, void *data)
 
 /*****************************************************************************
  *Function name
- *    get_uint    : get an unsigned integer number
+ *    ltt_get_uint    : get an unsigned integer number
  *Input params 
  *    reverse_byte_order: must we reverse the byte order ?
  *    size            : the size of the integer
@@ -2327,7 +2296,7 @@ gint64 get_int(gboolean reverse_byte_order, gint size, void *data)
  *    guint64         : a 64 bits unsigned integer
  ****************************************************************************/
 
-guint64 get_uint(gboolean reverse_byte_order, gint size, void *data)
+guint64 ltt_get_uint(gboolean reverse_byte_order, gint size, void *data)
 {
   guint64 val;
 
@@ -2400,6 +2369,6 @@ static void __attribute__((constructor)) init(void)
   LTT_FACILITY_NAME_HEARTBEAT = g_quark_from_string("heartbeat");
   LTT_EVENT_NAME_HEARTBEAT = g_quark_from_string("heartbeat");
   
-  LTT_TRACEFILE_NAME_FACILITIES = g_quark_from_string("control/facilities");
+  LTT_TRACEFILE_NAME_FACILITIES = g_quark_from_string("/control/facilities");
 }
 
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