include/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
  22 #include <babeltrace/types.h>
  23 #include <babeltrace/babeltrace-internal.h>
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <fcntl.h>
  27 #include <sys/mman.h>
  28 #include <errno.h>
  29 #include <stdint.h>
  30 #include <unistd.h>
  31 #include <glib.h>
  32 #include <stdio.h>
  33
  34 struct bt_stream_callbacks;
  35
  36 struct packet_index {
  37         off_t offset;           /* offset of the packet in the file, in bytes */
  38         off_t data_offset;      /* offset of data within the packet, in bits */
  39         size_t packet_size;     /* packet size, in bits */
  40         size_t content_size;    /* content size, in bits */
  41         uint64_t timestamp_begin;
  42         uint64_t timestamp_end;
  43 };
  44
  45 /*
  46  * Always update ctf_stream_pos with ctf_move_pos and ctf_init_pos.
  47  */
  48 struct ctf_stream_pos {
  49         struct stream_pos parent;
  50         int fd;                 /* backing file fd. -1 if unset. */
  51         GArray *packet_index;   /* contains struct packet_index */
  52         int prot;               /* mmap protection */
  53         int flags;              /* mmap flags */
  54
  55         /* Current position */
  56         off_t mmap_offset;      /* mmap offset in the file, in bytes */
  57         size_t packet_size;     /* current packet size, in bits */
  58         size_t content_size;    /* current content size, in bits */
  59         uint32_t *content_size_loc; /* pointer to current content size */
  60         char *base;             /* mmap base address */
  61         ssize_t offset;         /* offset from base, in bits. EOF for end of file. */
  62         size_t cur_index;       /* current index in packet index */
  63         void (*move_pos_slow)(struct ctf_stream_pos *pos, size_t offset,
  64                         int whence); /* function called to switch packet */
  65
  66         int dummy;              /* dummy position, for length calculation */
  67         struct bt_stream_callbacks *cb; /* Callbacks registered for iterator. */
  68 };
  69
  70 static inline
  71 struct ctf_stream_pos *ctf_pos(struct stream_pos *pos)
  72 {
  73         return container_of(pos, struct ctf_stream_pos, parent);
  74 }
  75
  76 int ctf_integer_read(struct stream_pos *pos, struct definition *definition);
  77 int ctf_integer_write(struct stream_pos *pos, struct definition *definition);
  78 int ctf_float_read(struct stream_pos *pos, struct definition *definition);
  79 int ctf_float_write(struct stream_pos *pos, struct definition *definition);
  80 int ctf_string_read(struct stream_pos *pos, struct definition *definition);
  81 int ctf_string_write(struct stream_pos *pos, struct definition *definition);
  82 int ctf_enum_read(struct stream_pos *pos, struct definition *definition);
  83 int ctf_enum_write(struct stream_pos *pos, struct definition *definition);
  84 int ctf_struct_rw(struct stream_pos *pos, struct definition *definition);
  85 int ctf_variant_rw(struct stream_pos *pos, struct definition *definition);
  86 int ctf_array_read(struct stream_pos *pos, struct definition *definition);
  87 int ctf_array_write(struct stream_pos *pos, struct definition *definition);
  88 int ctf_sequence_read(struct stream_pos *pos, struct definition *definition);
  89 int ctf_sequence_write(struct stream_pos *pos, struct definition *definition);
  90
  91 void ctf_move_pos_slow(struct ctf_stream_pos *pos, size_t offset, int whence);
  92
  93 void ctf_init_pos(struct ctf_stream_pos *pos, int fd, int open_flags);
  94 void ctf_fini_pos(struct ctf_stream_pos *pos);
  95
  96 /*
  97  * move_pos - move position of a relative bit offset
  98  *
  99  * TODO: allow larger files by updating base too.
 100  */
 101 static inline
 102 void ctf_move_pos(struct ctf_stream_pos *pos, size_t bit_offset)
 103 {
 104         printf_debug("ctf_move_pos test EOF: %zd\n", pos->offset);
 105         if (unlikely(pos->offset == EOF))
 106                 return;
 107
 108         if (pos->fd >= 0) {
 109                 /*
 110                  * PROT_READ ctf_move_pos_slow is called from within
 111                  * ctf_pos_get_event so end of packet does not change
 112                  * the packet context on for the last event of the
 113                  * packet.
 114                  */
 115                 if ((pos->prot == PROT_WRITE)
 116                         && (unlikely(pos->offset + bit_offset >= pos->packet_size))) {
 117                         printf_debug("ctf_move_pos_slow (before call): %zd\n",
 118                                      pos->offset);
 119                         ctf_move_pos_slow(pos, bit_offset, SEEK_CUR);
 120                         printf_debug("ctf_move_pos_slow (after call): %zd\n",
 121                                      pos->offset);
 122                         return;
 123                 }
 124         }
 125         pos->offset += bit_offset;
 126         printf_debug("ctf_move_pos after increment: %zd\n", pos->offset);
 127 }
 128
 129 /*
 130  * align_pos - align position on a bit offset (> 0)
 131  *
 132  * TODO: allow larger files by updating base too.
 133  */
 134 static inline
 135 void ctf_align_pos(struct ctf_stream_pos *pos, size_t bit_offset)
 136 {
 137         ctf_move_pos(pos, offset_align(pos->offset, bit_offset));
 138 }
 139
 140 static inline
 141 char *ctf_get_pos_addr(struct ctf_stream_pos *pos)
 142 {
 143         /* Only makes sense to get the address after aligning on CHAR_BIT */
 144         assert(!(pos->offset % CHAR_BIT));
 145         return pos->base + (pos->offset / CHAR_BIT);
 146 }
 147
 148 static inline
 149 void ctf_dummy_pos(struct ctf_stream_pos *pos, struct ctf_stream_pos *dummy)
 150 {
 151         memcpy(dummy, pos, sizeof(struct ctf_stream_pos));
 152         dummy->dummy = 1;
 153         dummy->fd = -1;
 154 }
 155
 156 /*
 157  * Check if current packet can hold data.
 158  * Returns 0 for success, negative error otherwise.
 159  */
 160 static inline
 161 int ctf_pos_packet(struct ctf_stream_pos *dummy)
 162 {
 163         if (unlikely(dummy->offset > dummy->packet_size))
 164                 return -ENOSPC;
 165         return 0;
 166 }
 167
 168 static inline
 169 void ctf_pos_pad_packet(struct ctf_stream_pos *pos)
 170 {
 171         ctf_move_pos(pos, pos->packet_size - pos->offset);
 172 }
 173
 174 static inline
 175 int ctf_pos_access_ok(struct ctf_stream_pos *pos, size_t bit_len)
 176 {
 177         if (unlikely(pos->offset == EOF))
 178                 return 0;
 179         if (unlikely(pos->offset + bit_len > pos->packet_size))
 180                 return 0;
 181         return 1;
 182 }
 183
 184 /*
 185  * Update the stream position for to the current event. This moves to
 186  * the next packet if we are located at the end of the current packet.
 187  */
 188 static inline
 189 void ctf_pos_get_event(struct ctf_stream_pos *pos)
 190 {
 191         assert(pos->offset <= pos->content_size);
 192         if (pos->offset == pos->content_size) {
 193                 printf_debug("ctf_move_pos_slow (before call): %zd\n",
 194                              pos->offset);
 195                 pos->move_pos_slow(pos, 0, SEEK_CUR);
 196                 printf_debug("ctf_move_pos_slow (after call): %zd\n",
 197                              pos->offset);
 198         }
 199 }
 200
 201 #endif /* _BABELTRACE_CTF_TYPES_H */