/usr/include/lttng/channel.h is in liblttng-ctl-dev 2.9.3-1.
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 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 | /*
* Copyright (C) 2014 - David Goulet <dgoulet@efficios.com>
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License, version 2.1 only,
* as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef LTTNG_CHANNEL_H
#define LTTNG_CHANNEL_H
#include <lttng/domain.h>
#include <lttng/event.h>
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* Tracer channel attributes. For both kernel and user-space.
*
* The structures should be initialized to zero before use.
*/
#define LTTNG_CHANNEL_ATTR_PADDING1 LTTNG_SYMBOL_NAME_LEN + 12
struct lttng_channel_attr {
int overwrite; /* -1: session default, 1: overwrite, 0: discard */
uint64_t subbuf_size; /* bytes, power of 2 */
uint64_t num_subbuf; /* power of 2 */
unsigned int switch_timer_interval; /* usec */
unsigned int read_timer_interval; /* usec */
enum lttng_event_output output; /* splice, mmap */
/* LTTng 2.1 padding limit */
uint64_t tracefile_size; /* bytes */
uint64_t tracefile_count; /* number of tracefiles */
/* LTTng 2.3 padding limit */
unsigned int live_timer_interval; /* usec */
/* LTTng 2.7 padding limit */
uint32_t align_to_64;
union {
uint64_t padding;
void *ptr;
} extended;
char padding[LTTNG_CHANNEL_ATTR_PADDING1];
};
/*
* Channel information structure. For both kernel and user-space.
*
* The structures should be initialized to zero before use.
*/
#define LTTNG_CHANNEL_PADDING1 16
struct lttng_channel {
char name[LTTNG_SYMBOL_NAME_LEN];
uint32_t enabled;
struct lttng_channel_attr attr;
char padding[LTTNG_CHANNEL_PADDING1];
};
/*
* List the channel(s) of a session.
*
* The handle CAN NOT be NULL.
*
* Return the size (number of entries) of the "lttng_channel" array. Caller
* must free channels. On error, a negative LTTng error code is returned.
*/
extern int lttng_list_channels(struct lttng_handle *handle,
struct lttng_channel **channels);
/*
* Create or enable a channel.
*
* The chan and handle params can not be NULL.
*
* Return 0 on success else a negative LTTng error code.
*/
extern int lttng_enable_channel(struct lttng_handle *handle,
struct lttng_channel *chan);
/*
* Disable channel.
*
* Name and handle CAN NOT be NULL.
*
* Return 0 on success else a negative LTTng error code.
*/
extern int lttng_disable_channel(struct lttng_handle *handle,
const char *name);
/*
* Set the default channel attributes for a specific domain and an allocated
* lttng_channel_attr pointer.
*
* If one or both arguments are NULL, nothing happens.
*/
extern void lttng_channel_set_default_attr(struct lttng_domain *domain,
struct lttng_channel_attr *attr);
/*
* Get the discarded event count of a specific LTTng channel.
*
* Returns 0 on success, or a negative LTTng error code on error.
*/
extern int lttng_channel_get_discarded_event_count(struct lttng_channel *chan,
uint64_t *discarded_events);
/*
* Get the lost packet count of a specific LTTng channel.
*
* Returns 0 on success, or a negative LTTng error code on error.
*/
extern int lttng_channel_get_lost_packet_count(struct lttng_channel *chan,
uint64_t *lost_packets);
#ifdef __cplusplus
}
#endif
#endif /* LTTNG_CHANNEL_H */
|