/usr/include/lttng/ringbuffer-abi.h is in liblttng-ust-dev 2.0.2-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 | #ifndef _LTTNG_RING_BUFFER_ABI_H
#define _LTTNG_RING_BUFFER_ABI_H
/*
* lttng/ringbuffer-abi.h
*
* (C) Copyright 2005-2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* Wait-free ring buffer ABI.
*
* Author:
* Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*/
#define _UST_CMD(minor) (minor)
#define _UST_CMDR(minor, type) (minor)
#define _UST_CMDW(minor, type) (minor)
/*
* Use RING_BUFFER_GET_NEXT_SUBBUF / RING_BUFFER_PUT_NEXT_SUBBUF to read and
* consume sub-buffers sequentially.
*
* Reading sub-buffers without consuming them can be performed with:
*
* RING_BUFFER_SNAPSHOT
* RING_BUFFER_SNAPSHOT_GET_CONSUMED
* RING_BUFFER_SNAPSHOT_GET_PRODUCED
*
* to get the offset range to consume, and then by passing each sub-buffer
* offset to RING_BUFFER_GET_SUBBUF, read the sub-buffer, and then release it
* with RING_BUFFER_PUT_SUBBUF.
*
* Note that the "snapshot" API can be used to read the sub-buffer in reverse
* order, which is useful for flight recorder snapshots.
*/
/* Get a snapshot of the current ring buffer producer and consumer positions */
#define RING_BUFFER_SNAPSHOT _UST_CMD(0x00)
/* Get the consumer position (iteration start) */
#define RING_BUFFER_SNAPSHOT_GET_CONSUMED _UST_CMDR(0x01, unsigned long)
/* Get the producer position (iteration end) */
#define RING_BUFFER_SNAPSHOT_GET_PRODUCED _UST_CMDR(0x02, unsigned long)
/* Get exclusive read access to the specified sub-buffer position */
#define RING_BUFFER_GET_SUBBUF _UST_CMDW(0x03, unsigned long)
/* Release exclusive sub-buffer access */
#define RING_BUFFER_PUT_SUBBUF _UST_CMD(0x04)
/* Get exclusive read access to the next sub-buffer that can be read. */
#define RING_BUFFER_GET_NEXT_SUBBUF _UST_CMD(0x05)
/* Release exclusive sub-buffer access, move consumer forward. */
#define RING_BUFFER_PUT_NEXT_SUBBUF _UST_CMD(0x06)
/* returns the size of the current sub-buffer, without padding (for mmap). */
#define RING_BUFFER_GET_SUBBUF_SIZE _UST_CMDR(0x07, unsigned long)
/* returns the size of the current sub-buffer, with padding (for splice). */
#define RING_BUFFER_GET_PADDED_SUBBUF_SIZE _UST_CMDR(0x08, unsigned long)
/* returns the maximum size for sub-buffers. */
#define RING_BUFFER_GET_MAX_SUBBUF_SIZE _UST_CMDR(0x09, unsigned long)
/* returns the length to mmap. */
#define RING_BUFFER_GET_MMAP_LEN _UST_CMDR(0x0A, unsigned long)
/* returns the offset of the subbuffer belonging to the mmap reader. */
#define RING_BUFFER_GET_MMAP_READ_OFFSET _UST_CMDR(0x0B, unsigned long)
/* flush the current sub-buffer */
#define RING_BUFFER_FLUSH _UST_CMD(0x0C)
#endif /* _LTTNG_RING_BUFFER_ABI_H */
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