projects / lttng-modules.git / blame
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1 | #ifndef _LIB_RING_BUFFER_ITERATOR_H |
| 2 | #define _LIB_RING_BUFFER_ITERATOR_H | |
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3 | |
| 4 | /* | |
| 886d51a3 | 5 | * lib/ringbuffer/iterator.h |
| f3bc08c5 MD |
6 | * |
| 7 | * Ring buffer and channel iterators. | |
| 8 | * | |
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9 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 10 | * | |
| 11 | * This library is free software; you can redistribute it and/or | |
| 12 | * modify it under the terms of the GNU Lesser General Public | |
| 13 | * License as published by the Free Software Foundation; only | |
| 14 | * version 2.1 of the License. | |
| 15 | * | |
| 16 | * This library is distributed in the hope that it will be useful, | |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 19 | * Lesser General Public License for more details. | |
| 20 | * | |
| 21 | * You should have received a copy of the GNU Lesser General Public | |
| 22 | * License along with this library; if not, write to the Free Software | |
| 23 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 24 | * | |
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25 | * Author: |
| 26 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
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27 | */ |
| 28 | ||
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29 | #include <wrapper/ringbuffer/backend.h> |
| 30 | #include <wrapper/ringbuffer/frontend.h> | |
| 31 | #include <wrapper/ringbuffer/vfs.h> | |
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32 | |
| 33 | /* | |
| 34 | * lib_ring_buffer_get_next_record advances the buffer read position to the next | |
| 35 | * record. It returns either the size of the next record, -EAGAIN if there is | |
| 36 | * currently no data available, or -ENODATA if no data is available and buffer | |
| 37 | * is finalized. | |
| 38 | */ | |
| 39 | extern ssize_t lib_ring_buffer_get_next_record(struct channel *chan, | |
| 40 | struct lib_ring_buffer *buf); | |
| 41 | ||
| 42 | /* | |
| 43 | * channel_get_next_record advances the buffer read position to the next record. | |
| 44 | * It returns either the size of the next record, -EAGAIN if there is currently | |
| 45 | * no data available, or -ENODATA if no data is available and buffer is | |
| 46 | * finalized. | |
| 47 | * Returns the current buffer in ret_buf. | |
| 48 | */ | |
| 49 | extern ssize_t channel_get_next_record(struct channel *chan, | |
| 50 | struct lib_ring_buffer **ret_buf); | |
| 51 | ||
| 52 | /** | |
| 53 | * read_current_record - copy the buffer current record into dest. | |
| 54 | * @buf: ring buffer | |
| 55 | * @dest: destination where the record should be copied | |
| 56 | * | |
| 57 | * dest should be large enough to contain the record. Returns the number of | |
| 58 | * bytes copied. | |
| 59 | */ | |
| 60 | static inline size_t read_current_record(struct lib_ring_buffer *buf, void *dest) | |
| 61 | { | |
| 62 | return lib_ring_buffer_read(&buf->backend, buf->iter.read_offset, | |
| 63 | dest, buf->iter.payload_len); | |
| 64 | } | |
| 65 | ||
| 66 | extern int lib_ring_buffer_iterator_open(struct lib_ring_buffer *buf); | |
| 67 | extern void lib_ring_buffer_iterator_release(struct lib_ring_buffer *buf); | |
| 68 | extern int channel_iterator_open(struct channel *chan); | |
| 69 | extern void channel_iterator_release(struct channel *chan); | |
| 70 | ||
| 71 | extern const struct file_operations channel_payload_file_operations; | |
| 72 | extern const struct file_operations lib_ring_buffer_payload_file_operations; | |
| 73 | ||
| 74 | /* | |
| 75 | * Used internally. | |
| 76 | */ | |
| 77 | int channel_iterator_init(struct channel *chan); | |
| 78 | void channel_iterator_unregister_notifiers(struct channel *chan); | |
| 79 | void channel_iterator_free(struct channel *chan); | |
| 80 | void channel_iterator_reset(struct channel *chan); | |
| 81 | void lib_ring_buffer_iterator_reset(struct lib_ring_buffer *buf); | |
| 82 | ||
| 886d51a3 | 83 | #endif /* _LIB_RING_BUFFER_ITERATOR_H */ |