include/babeltrace/ctf/iterator.h

   1 #ifndef _BABELTRACE_CTF_ITERATOR_H
   2 #define _BABELTRACE_CTF_ITERATOR_H
   3
   4 /*
   5  * BabelTrace
   6  *
   7  * CTF iterator API
   8  *
   9  * Copyright 2011-2012 EfficiOS Inc. and Linux Foundation
  10  *
  11  * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  12  *         Julien Desfossez <julien.desfossez@efficios.com>
  13  *
  14  * Permission is hereby granted, free of charge, to any person obtaining
  15  * a copy of this software and associated documentation files (the
  16  * "Software"), to deal in the Software without restriction, including
  17  * without limitation the rights to use, copy, modify, merge, publish,
  18  * distribute, sublicense, and/or sell copies of the Software, and to
  19  * permit persons to whom the Software is furnished to do so, subject to
  20  * the following conditions:
  21  *
  22  * The above copyright notice and this permission notice shall be
  23  * included in all copies or substantial portions of the Software.
  24  */
  25
  26 #include <babeltrace/iterator.h>
  27
  28 #ifdef __cplusplus
  29 extern "C" {
  30 #endif
  31
  32 struct bt_ctf_iter;
  33 struct bt_ctf_event;
  34
  35 /*
  36  * bt_ctf_iter_create - Allocate a CTF trace collection iterator.
  37  *
  38  * begin_pos and end_pos are optional parameters to specify the position
  39  * at which the trace collection should be seeked upon iterator
  40  * creation, and the position at which iteration will start returning
  41  * "EOF".
  42  *
  43  * By default, if begin_pos is NULL, a BT_SEEK_CUR is performed at
  44  * creation. By default, if end_pos is NULL, a BT_SEEK_END (end of
  45  * trace) is the EOF criterion.
  46  *
  47  * Return a pointer to the newly allocated iterator.
  48  *
  49  * Only one iterator can be created against a context. If more than one
  50  * iterator is being created for the same context, the second creation
  51  * will return NULL. The previous iterator must be destroyed before
  52  * creation of the new iterator for this function to succeed.
  53  */
  54 struct bt_ctf_iter *bt_ctf_iter_create(struct bt_context *ctx,
  55                 const struct bt_iter_pos *begin_pos,
  56                 const struct bt_iter_pos *end_pos);
  57
  58 /*
  59  * bt_ctf_get_iter - get iterator from ctf iterator.
  60  */
  61 struct bt_iter *bt_ctf_get_iter(struct bt_ctf_iter *iter);
  62
  63 /*
  64  * bt_ctf_iter_destroy - Free a CTF trace collection iterator.
  65  */
  66 void bt_ctf_iter_destroy(struct bt_ctf_iter *iter);
  67
  68 /*
  69  * bt_ctf_iter_read_event: Read the iterator's current event data.
  70  *
  71  * @iter: trace collection iterator (input). Should NOT be NULL.
  72  *
  73  * Return current event on success, NULL on end of trace.
  74  */
  75 struct bt_ctf_event *bt_ctf_iter_read_event(struct bt_ctf_iter *iter);
  76
  77 #ifdef __cplusplus
  78 }
  79 #endif
  80
  81 #endif /* _BABELTRACE_CTF_ITERATOR_H */