lib/babeltrace/ctf/types.h

   1 #ifndef _BABELTRACE_CTF_TYPES_H
   2 #define _BABELTRACE_CTF_TYPES_H
   3
   4 /*
   5  * Common Trace Format
   6  *
   7  * Type header
   8  *
   9  * Copyright 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a copy
  12  * of this software and associated documentation files (the "Software"), to deal
  13  * in the Software without restriction, including without limitation the rights
  14  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  15  * copies of the Software, and to permit persons to whom the Software is
  16  * furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice shall be included in
  19  * all copies or substantial portions of the Software.
  20  *
  21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  22  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  24  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  25  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  26  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  27  * SOFTWARE.
  28  */
  29
  30 #include <babeltrace/types.h>
  31 #include <babeltrace/babeltrace-internal.h>
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34 #include <fcntl.h>
  35 #include <errno.h>
  36 #include <stdint.h>
  37 #include <unistd.h>
  38 #include <glib.h>
  39 #include <stdio.h>
  40 #include <inttypes.h>
  41 #include <babeltrace/mmap-align.h>
  42
  43 #define LAST_OFFSET_POISON      ((int64_t) ~0ULL)
  44
  45 struct bt_stream_callbacks;
  46
  47 struct packet_index_time {
  48         uint64_t timestamp_begin;
  49         uint64_t timestamp_end;
  50 };
  51
  52 struct packet_index {
  53         off_t offset;           /* offset of the packet in the file, in bytes */
  54         int64_t data_offset;    /* offset of data within the packet, in bits */
  55         uint64_t packet_size;   /* packet size, in bits */
  56         uint64_t content_size;  /* content size, in bits */
  57         uint64_t events_discarded;
  58         uint64_t events_discarded_len;  /* length of the field, in bits */
  59         struct packet_index_time ts_cycles;     /* timestamp in cycles */
  60         struct packet_index_time ts_real;       /* realtime timestamp */
  61 };
  62
  63 /*
  64  * Always update ctf_stream_pos with ctf_move_pos and ctf_init_pos.
  65  */
  66 struct ctf_stream_pos {
  67         struct bt_stream_pos parent;
  68         int fd;                 /* backing file fd. -1 if unset. */
  69         FILE *index_fp;         /* backing index file fp. NULL if unset. */
  70         GArray *packet_index;   /* contains struct packet_index */
  71         int prot;               /* mmap protection */
  72         int flags;              /* mmap flags */
  73
  74         /* Current position */
  75         off_t mmap_offset;      /* mmap offset in the file, in bytes */
  76         off_t mmap_base_offset; /* offset of start of packet in mmap, in bytes */
  77         uint64_t packet_size;   /* current packet size, in bits */
  78         uint64_t content_size;  /* current content size, in bits */
  79         uint64_t *content_size_loc; /* pointer to current content size */
  80         struct mmap_align *base_mma;/* mmap base address */
  81         int64_t offset;         /* offset from base, in bits. EOF for end of file. */
  82         int64_t last_offset;    /* offset before the last read_event */
  83         int64_t data_offset;    /* offset of data in current packet */
  84         uint64_t cur_index;     /* current index in packet index */
  85         uint64_t last_events_discarded; /* last known amount of event discarded */
  86         void (*packet_seek)(struct bt_stream_pos *pos, size_t index,
  87                         int whence); /* function called to switch packet */
  88
  89         int dummy;              /* dummy position, for length calculation */
  90         struct bt_stream_callbacks *cb; /* Callbacks registered for iterator. */
  91         void *priv;
  92 };
  93
  94 static inline
  95 struct ctf_stream_pos *ctf_pos(struct bt_stream_pos *pos)
  96 {
  97         return container_of(pos, struct ctf_stream_pos, parent);
  98 }
  99
 100 BT_HIDDEN
 101 int ctf_integer_read(struct bt_stream_pos *pos, struct bt_definition *definition);
 102 BT_HIDDEN
 103 int ctf_integer_write(struct bt_stream_pos *pos, struct bt_definition *definition);
 104 BT_HIDDEN
 105 int ctf_float_read(struct bt_stream_pos *pos, struct bt_definition *definition);
 106 BT_HIDDEN
 107 int ctf_float_write(struct bt_stream_pos *pos, struct bt_definition *definition);
 108 BT_HIDDEN
 109 int ctf_string_read(struct bt_stream_pos *pos, struct bt_definition *definition);
 110 BT_HIDDEN
 111 int ctf_string_write(struct bt_stream_pos *pos, struct bt_definition *definition);
 112 BT_HIDDEN
 113 int ctf_enum_read(struct bt_stream_pos *pos, struct bt_definition *definition);
 114 BT_HIDDEN
 115 int ctf_enum_write(struct bt_stream_pos *pos, struct bt_definition *definition);
 116 BT_HIDDEN
 117 int ctf_struct_rw(struct bt_stream_pos *pos, struct bt_definition *definition);
 118 BT_HIDDEN
 119 int ctf_variant_rw(struct bt_stream_pos *pos, struct bt_definition *definition);
 120 BT_HIDDEN
 121 int ctf_array_read(struct bt_stream_pos *pos, struct bt_definition *definition);
 122 BT_HIDDEN
 123 int ctf_array_write(struct bt_stream_pos *pos, struct bt_definition *definition);
 124 BT_HIDDEN
 125 int ctf_sequence_read(struct bt_stream_pos *pos, struct bt_definition *definition);
 126 BT_HIDDEN
 127 int ctf_sequence_write(struct bt_stream_pos *pos, struct bt_definition *definition);
 128
 129 void ctf_packet_seek(struct bt_stream_pos *pos, size_t index, int whence);
 130
 131 int ctf_init_pos(struct ctf_stream_pos *pos, struct bt_trace_descriptor *trace,
 132                 int fd, int open_flags);
 133 int ctf_fini_pos(struct ctf_stream_pos *pos);
 134
 135 /*
 136  * move_pos - move position of a relative bit offset
 137  *
 138  * Return 1 if OK, 0 if out-of-bound.
 139  *
 140  * TODO: allow larger files by updating base too.
 141  */
 142 static inline
 143 int ctf_move_pos(struct ctf_stream_pos *pos, uint64_t bit_offset)
 144 {
 145         uint64_t max_len;
 146
 147         printf_debug("ctf_move_pos test EOF: %" PRId64 "\n", pos->offset);
 148         if (unlikely(pos->offset == EOF))
 149                 return 0;
 150         if (pos->prot == PROT_READ)
 151                 max_len = pos->content_size;
 152         else
 153                 max_len = pos->packet_size;
 154         if (unlikely(pos->offset + bit_offset > max_len))
 155                 return 0;
 156
 157         pos->offset += bit_offset;
 158         printf_debug("ctf_move_pos after increment: %" PRId64 "\n", pos->offset);
 159         return 1;
 160 }
 161
 162 /*
 163  * align_pos - align position on a bit offset (> 0)
 164  *
 165  * Return 1 if OK, 0 if out-of-bound.
 166  *
 167  * TODO: allow larger files by updating base too.
 168  */
 169 static inline
 170 int ctf_align_pos(struct ctf_stream_pos *pos, uint64_t bit_offset)
 171 {
 172         return ctf_move_pos(pos, offset_align(pos->offset, bit_offset));
 173 }
 174
 175 static inline
 176 char *ctf_get_pos_addr(struct ctf_stream_pos *pos)
 177 {
 178         /* Only makes sense to get the address after aligning on CHAR_BIT */
 179         assert(!(pos->offset % CHAR_BIT));
 180         return mmap_align_addr(pos->base_mma) +
 181                 pos->mmap_base_offset + (pos->offset / CHAR_BIT);
 182 }
 183
 184 static inline
 185 void ctf_dummy_pos(struct ctf_stream_pos *pos, struct ctf_stream_pos *dummy)
 186 {
 187         memcpy(dummy, pos, sizeof(struct ctf_stream_pos));
 188         dummy->dummy = 1;
 189         dummy->fd = -1;
 190 }
 191
 192 /*
 193  * Check if current packet can hold data.
 194  * Returns 0 for success, negative error otherwise.
 195  */
 196 static inline
 197 int ctf_pos_packet(struct ctf_stream_pos *dummy)
 198 {
 199         if (unlikely(dummy->offset > dummy->packet_size))
 200                 return -ENOSPC;
 201         return 0;
 202 }
 203
 204 static inline
 205 void ctf_pos_pad_packet(struct ctf_stream_pos *pos)
 206 {
 207         ctf_packet_seek(&pos->parent, 0, SEEK_CUR);
 208 }
 209
 210 static inline
 211 int ctf_pos_access_ok(struct ctf_stream_pos *pos, uint64_t bit_len)
 212 {
 213         uint64_t max_len;
 214
 215         if (unlikely(pos->offset == EOF))
 216                 return 0;
 217         if (pos->prot == PROT_READ)
 218                 max_len = pos->content_size;
 219         else
 220                 max_len = pos->packet_size;
 221         if (unlikely(pos->offset + bit_len > max_len))
 222                 return 0;
 223         return 1;
 224 }
 225
 226 /*
 227  * Update the stream position to the current event. This moves to
 228  * the next packet if we are located at the end of the current packet.
 229  */
 230 static inline
 231 void ctf_pos_get_event(struct ctf_stream_pos *pos)
 232 {
 233         assert(pos->offset <= pos->content_size);
 234         if (pos->offset == pos->content_size) {
 235                 printf_debug("ctf_packet_seek (before call): %" PRId64 "\n",
 236                              pos->offset);
 237                 pos->packet_seek(&pos->parent, 0, SEEK_CUR);
 238                 printf_debug("ctf_packet_seek (after call): %" PRId64 "\n",
 239                              pos->offset);
 240         }
 241 }
 242
 243 void ctf_print_timestamp(FILE *fp, struct ctf_stream_definition *stream,
 244                         uint64_t timestamp);
 245
 246 #endif /* _BABELTRACE_CTF_TYPES_H */