src/common/index/ctf-index.hpp

   1 /*
   2  * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com>
   3  * Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
   5  *
   6  * SPDX-License-Identifier: MIT
   7  *
   8  */
   9
  10 #ifndef LTTNG_INDEX_H
  11 #define LTTNG_INDEX_H
  12
  13 #include <common/compat/endian.hpp>
  14 #include <common/macros.hpp>
  15
  16 #include <stdint.h>
  17 #include <limits.h>
  18 #include <stddef.h>
  19
  20 #define CTF_INDEX_MAGIC 0xC1F1DCC1
  21 #define CTF_INDEX_MAJOR 1
  22 #define CTF_INDEX_MINOR 1
  23
  24 /*
  25  * Header at the beginning of each index file.
  26  * All integer fields are stored in big endian.
  27  */
  28 struct ctf_packet_index_file_hdr {
  29         uint32_t magic;
  30         uint32_t index_major;
  31         uint32_t index_minor;
  32         /* struct packet_index_len, in bytes */
  33         uint32_t packet_index_len;
  34 } __attribute__((__packed__));
  35
  36 /*
  37  * Packet index generated for each trace packet stored in a trace file.
  38  * All integer fields are stored in big endian.
  39  */
  40 struct ctf_packet_index {
  41         uint64_t offset;                /* offset of the packet in the file, in bytes */
  42         uint64_t packet_size;           /* packet size, in bits */
  43         uint64_t content_size;          /* content size, in bits */
  44         uint64_t timestamp_begin;
  45         uint64_t timestamp_end;
  46         uint64_t events_discarded;
  47         uint64_t stream_id;             /* ID of the channel */
  48         /* CTF_INDEX 1.0 limit */
  49         uint64_t stream_instance_id;    /* ID of the channel instance */
  50         uint64_t packet_seq_num;        /* packet sequence number */
  51 } __attribute__((__packed__));
  52
  53 static inline size_t ctf_packet_index_len(uint32_t major, uint32_t minor)
  54 {
  55         if (major == 1) {
  56                 switch (minor) {
  57                 case 0:
  58                         return offsetof(struct ctf_packet_index, stream_id)
  59                                 + member_sizeof(struct ctf_packet_index,
  60                                                 stream_id);
  61                 case 1:
  62                         return offsetof(struct ctf_packet_index, packet_seq_num)
  63                                 + member_sizeof(struct ctf_packet_index,
  64                                                 packet_seq_num);
  65                 default:
  66                         abort();
  67                 }
  68         }
  69         abort();
  70 }
  71
  72 static inline uint32_t lttng_to_index_major(uint32_t lttng_major,
  73                 uint32_t lttng_minor __attribute__((unused)))
  74 {
  75         if (lttng_major == 2) {
  76                 return 1;
  77         }
  78         abort();
  79 }
  80
  81 static inline uint32_t lttng_to_index_minor(uint32_t lttng_major,
  82                 uint32_t lttng_minor)
  83 {
  84         if (lttng_major == 2) {
  85                 if (lttng_minor < 8) {
  86                         return 0;
  87                 } else {
  88                         return 1;
  89                 }
  90         }
  91         abort();
  92 }
  93
  94 static inline void ctf_packet_index_file_hdr_init(
  95                 struct ctf_packet_index_file_hdr *hdr,
  96                 uint32_t idx_major, uint32_t idx_minor)
  97 {
  98         memset(hdr, 0, sizeof(*hdr));
  99         hdr->magic = htobe32(CTF_INDEX_MAGIC);
 100         hdr->index_major = htobe32(idx_major);
 101         hdr->index_minor = htobe32(idx_minor);
 102         hdr->packet_index_len = htobe32(
 103                         ctf_packet_index_len(idx_major, idx_minor));
 104 }
 105
 106 #endif /* LTTNG_INDEX_H */