/usr/include/lttng/session.h is in liblttng-ctl-dev 2.7.1-2~fakesync1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 | /*
* 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_SESSION_H
#define LTTNG_SESSION_H
#ifdef __cplusplus
extern "C" {
#endif
/*
* Basic session information.
*
* The "enabled" field is only used when listing the sessions which indicate if
* it's started or not.
*
* The structures should be initialized to zero before use.
*/
#define LTTNG_SESSION_PADDING1 12
struct lttng_session {
char name[NAME_MAX];
/* The path where traces are written */
char path[PATH_MAX];
uint32_t enabled; /* enabled/started: 1, disabled/stopped: 0 */
uint32_t snapshot_mode;
unsigned int live_timer_interval; /* usec */
char padding[LTTNG_SESSION_PADDING1];
};
/*
* Create a tracing session using a name and an optional URL.
*
* If _url_ is NULL, no consumer is created for the session. The name can't be
* NULL here.
*
* Return 0 on success else a negative LTTng error code.
*/
extern int lttng_create_session(const char *name, const char *url);
/*
* Create a tracing session that will exclusively be used for snapshot meaning
* the session will be in no output mode and every channel enabled for that
* session will be set in overwrite mode and in mmap output since splice is not
* supported.
*
* Name can't be NULL. If an url is given, it will be used to create a default
* snapshot output using it as a destination. If NULL, no output will be
* defined and an add-output call will be needed.
*
* Return 0 on success else a negative LTTng error code.
*/
extern int lttng_create_session_snapshot(const char *name,
const char *snapshot_url);
/*
* Create a session exclusively used for live reading.
*
* In this mode, the switch-timer parameter is forced for each UST channel, a
* live-switch-timer is enabled for kernel channels, manually setting
* switch-timer is forbidden. Synchronization beacons are sent to the relayd,
* indexes are sent and metadata is checked for each packet.
*
* Name can't be NULL. If no URL is given, the default is to send the data to
* net://127.0.0.1. The timer_interval is in usec and by default set to 1000000
* (1 second).
*
* Return 0 on success else a negative LTTng error code.
*/
extern int lttng_create_session_live(const char *name, const char *url,
unsigned int timer_interval);
/*
* Destroy a tracing session.
*
* The session will not be usable, tracing will be stopped thus buffers will be
* flushed.
*
* The name can't be NULL here.
*
* Return 0 on success else a negative LTTng error code.
*/
extern int lttng_destroy_session(const char *name);
/*
* List all the tracing sessions.
*
* Return the size (number of entries) of the "lttng_session" array. Caller
* must free sessions. On error, a negative LTTng error code is returned.
*/
extern int lttng_list_sessions(struct lttng_session **sessions);
/*
* Set the shared memory path for a session.
*
* Sets the (optional) file system path where shared memory buffers will
* be created for the session. This is useful for buffer extraction on
* crash, when used with filesystems like pramfs.
*
* Return 0 on success else a negative LTTng error code.
*/
extern int lttng_set_session_shm_path(const char *session_name,
const char *shm_path);
/*
* Add PID to session tracker.
*
* A pid argument >= 0 adds the PID to the session tracker.
* A pid argument of -1 means "track all PIDs".
*
* Return 0 on success else a negative LTTng error code.
*/
extern int lttng_track_pid(struct lttng_handle *handle, int pid);
/*
* Remove PID from session tracker.
*
* A pid argument >= 0 removes the PID from the session tracker.
* A pid argument of -1 means "untrack all PIDs".
*
* Return 0 on success else a negative LTTng error code.
*/
extern int lttng_untrack_pid(struct lttng_handle *handle, int pid);
/*
* List PIDs in the tracker.
*
* @enabled is set to whether the PID tracker is enabled.
* @pids is set to an allocated array of PIDs currently tracked. On
* success, @pids must be freed by the caller.
* @nr_pids is set to the number of entries contained by the @pids array.
*
* Returns 0 on success, else a negative LTTng error code.
*/
extern int lttng_list_tracker_pids(struct lttng_handle *handle,
int *enabled, int32_t **pids, size_t *nr_pids);
#ifdef __cplusplus
}
#endif
#endif /* LTTNG_SESSION_H */
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