formats/ctf-text/ctf-text.c

   1 /*
   2  * BabelTrace - Common Trace Format (CTF)
   3  *
   4  * CTF Text Format registration.
   5  *
   6  * Copyright 2010, 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  */
  18
  19 #include <babeltrace/format.h>
  20 #include <babeltrace/ctf-text/types.h>
  21 #include <babeltrace/ctf/metadata.h>
  22 #include <babeltrace/babeltrace.h>
  23 #include <inttypes.h>
  24 #include <uuid/uuid.h>
  25 #include <sys/mman.h>
  26 #include <errno.h>
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <fcntl.h>
  30 #include <dirent.h>
  31 #include <glib.h>
  32 #include <unistd.h>
  33 #include <stdlib.h>
  34
  35 struct trace_descriptor *ctf_text_open_trace(const char *path, int flags);
  36 void ctf_text_close_trace(struct trace_descriptor *descriptor);
  37
  38 static
  39 rw_dispatch write_dispatch_table[] = {
  40         [ CTF_TYPE_INTEGER ] = ctf_text_integer_write,
  41         [ CTF_TYPE_FLOAT ] = ctf_text_float_write,
  42         [ CTF_TYPE_ENUM ] = ctf_text_enum_write,
  43         [ CTF_TYPE_STRING ] = ctf_text_string_write,
  44         [ CTF_TYPE_STRUCT ] = ctf_text_struct_write,
  45         [ CTF_TYPE_VARIANT ] = ctf_text_variant_write,
  46         [ CTF_TYPE_ARRAY ] = ctf_text_array_write,
  47         [ CTF_TYPE_SEQUENCE ] = ctf_text_sequence_write,
  48 };
  49
  50 static
  51 struct format ctf_text_format = {
  52         .open_trace = ctf_text_open_trace,
  53         .close_trace = ctf_text_close_trace,
  54 };
  55
  56 static
  57 int ctf_text_write_event(struct stream_pos *ppos,
  58                          struct ctf_stream *stream)
  59 {
  60         struct ctf_text_stream_pos *pos =
  61                 container_of(ppos, struct ctf_text_stream_pos, parent);
  62         struct ctf_stream_class *stream_class = stream->stream_class;
  63         struct ctf_event *event_class;
  64         uint64_t id = 0;
  65         int len_index;
  66         int ret;
  67         int field_nr = 0;
  68
  69         /* print event header */
  70         if (stream_class->event_header) {
  71                 /* lookup event id */
  72                 len_index = struct_declaration_lookup_field_index(stream_class->event_header_decl,
  73                                 g_quark_from_static_string("id"));
  74                 if (len_index >= 0) {
  75                         struct definition_integer *defint;
  76                         struct definition *field;
  77
  78                         field = struct_definition_get_field_from_index(stream_class->event_header, len_index);
  79                         assert(field->declaration->id == CTF_TYPE_INTEGER);
  80                         defint = container_of(field, struct definition_integer, p);
  81                         assert(defint->declaration->signedness == FALSE);
  82                         id = defint->value._unsigned;   /* set id */
  83                 }
  84         }
  85
  86         if (id >= stream_class->events_by_id->len) {
  87                 fprintf(stdout, "[error] Event id %" PRIu64 " is outside range.\n", id);
  88                 return -EINVAL;
  89         }
  90         event_class = g_ptr_array_index(stream_class->events_by_id, id);
  91         if (!event_class) {
  92                 fprintf(stdout, "[error] Event id %" PRIu64 " is unknown.\n", id);
  93                 return -EINVAL;
  94         }
  95
  96         if (pos->print_names)
  97                 fprintf(pos->fp, "timestamp = ");
  98         else
  99                 fprintf(pos->fp, "[");
 100         fprintf(pos->fp, "%12" PRIu64, stream->timestamp);
 101         if (!pos->print_names)
 102                 fprintf(pos->fp, "]");
 103
 104         if (pos->print_names)
 105                 fprintf(pos->fp, ", ");
 106         else
 107                 fprintf(pos->fp, " ");
 108         if (pos->print_names)
 109                 fprintf(pos->fp, "name = ");
 110         fprintf(pos->fp, "%s", g_quark_to_string(event_class->name));
 111         if (pos->print_names)
 112                 field_nr++;
 113         else
 114                 fprintf(pos->fp, ": ");
 115
 116         /* Only show the event header in verbose mode */
 117         if (babeltrace_verbose && stream_class->event_header) {
 118                 if (field_nr++ != 0)
 119                         fprintf(pos->fp, ", ");
 120                 if (pos->print_names)
 121                         fprintf(pos->fp, "stream.event.header = ");
 122                 ret = generic_rw(ppos, &stream_class->event_header->p);
 123                 if (ret)
 124                         goto error;
 125         }
 126
 127         /* print stream-declared event context */
 128         if (stream_class->event_context) {
 129                 if (field_nr++ != 0)
 130                         fprintf(pos->fp, ", ");
 131                 if (pos->print_names)
 132                         fprintf(pos->fp, "stream.event.context = ");
 133                 ret = generic_rw(ppos, &stream_class->event_context->p);
 134                 if (ret)
 135                         goto error;
 136         }
 137
 138         /* print event-declared event context */
 139         if (event_class->context) {
 140                 if (field_nr++ != 0)
 141                         fprintf(pos->fp, ", ");
 142                 if (pos->print_names)
 143                         fprintf(pos->fp, "event.context = ");
 144                 ret = generic_rw(ppos, &event_class->context->p);
 145                 if (ret)
 146                         goto error;
 147         }
 148
 149         /* Read and print event payload */
 150         if (event_class->fields) {
 151                 if (field_nr++ != 0)
 152                         fprintf(pos->fp, ", ");
 153                 if (pos->print_names)
 154                         fprintf(pos->fp, "event.fields = ");
 155                 ret = generic_rw(ppos, &event_class->fields->p);
 156                 if (ret)
 157                         goto error;
 158         }
 159         fprintf(pos->fp, "\n");
 160
 161         return 0;
 162
 163 error:
 164         fprintf(stdout, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
 165         return ret;
 166 }
 167
 168
 169 struct trace_descriptor *ctf_text_open_trace(const char *path, int flags)
 170 {
 171         struct ctf_text_stream_pos *pos;
 172         FILE *fp;
 173
 174         pos = g_new0(struct ctf_text_stream_pos, 1);
 175
 176         switch (flags & O_ACCMODE) {
 177         case O_RDWR:
 178                 if (!path)
 179                         fp = stdout;
 180                 else
 181                         fp = fopen(path, "w");
 182                 if (!fp)
 183                         goto error;
 184                 pos->fp = fp;
 185                 pos->parent.rw_table = write_dispatch_table;
 186                 pos->parent.event_cb = ctf_text_write_event;
 187                 pos->print_names = opt_field_names;
 188                 break;
 189         case O_RDONLY:
 190         default:
 191                 fprintf(stdout, "[error] Incorrect open flags.\n");
 192                 goto error;
 193         }
 194
 195         return &pos->trace_descriptor;
 196 error:
 197         g_free(pos);
 198         return NULL;
 199 }
 200
 201 void ctf_text_close_trace(struct trace_descriptor *td)
 202 {
 203         struct ctf_text_stream_pos *pos =
 204                 container_of(td, struct ctf_text_stream_pos, trace_descriptor);
 205         fclose(pos->fp);
 206         g_free(pos);
 207 }
 208
 209 void __attribute__((constructor)) ctf_text_init(void)
 210 {
 211         int ret;
 212
 213         ctf_text_format.name = g_quark_from_static_string("text");
 214         ret = bt_register_format(&ctf_text_format);
 215         assert(!ret);
 216 }
 217
 218 /* TODO: finalize */