LTTNG−LIST - Online Linux Manual PageSection : 1
Updated : 28 November 2016
Source : LTTng 2​.12​.2
Note : LTTng Manual

NAMElttng-list − List LTTng tracing sessions, domains, channels, and events

SYNOPSISList existing tracing sessions: lttng [GENERAL OPTIONS] listList available event sources: lttng [GENERAL OPTIONS] list [--fields] [--kernel [--syscall]] [--userspace] [--jul] [--log4j] [--python]List tracing sessions domains: lttng [GENERAL OPTIONS] list --domain SESSIONList tracing sessions channels and event rules: lttng [GENERAL OPTIONS] list [--channel=CHANNEL] SESSION

DESCRIPTIONThe lttng list command lists tracing sessions, tracing domains, channels, and events​. Without arguments, lttng list lists the existing tracing sessions and shows if they are active or not​. With one or more of the --kernel, --userspace, --jul, --log4j, and --python domain options, the command lists the available event sources of the selected domain on the system​. The JUL, log4j, and Python domains list the names of their available loggers​. The --syscall option can be used alongside the --kernel option to get a list of traceable Linux system calls​. The --fields option can be used to show the fields of the listed event sources​. Providing a tracing session name SESSION targets a specific tracing session​. If the --domain option is used, domains containing at least one channel in the selected tracing session are listed​. Otherwise, all the domains, channels, and event rules of the selected tracing session are listed along with its details (trace path, for example), except when the --channel option is used to isolate a specific channel by name​.

OPTIONSGeneral options are described in lttng(1)​.

Domain-j, --jul List event sources in the java.util.logging (JUL) domain​. -k, --kernel List event sources in the Linux kernel domain​. -l, --log4j List event sources in the Apache log4j domain​. -p, --python List event sources in the Python domain​. -u, --userspace List event sources in the user space domain​.

Target-c CHANNEL, --channel=CHANNEL Only list the details of the channel named CHANNEL​.

Listing-d, --domain Show the domains of the target tracing session in which at least one channel exists​. -f, --fields When listing the event sources with one of the domain options, also show their fields​. --syscall When listing the event sources of the Linux kernel domain, list the traceable system calls instead of the kernel tracepoints​.

Program information-h, --help Show command help​. This option, like lttng-help(1), attempts to launch /usr/bin/man to view the commands man page​. The path to the man pager can be overridden by the LTTNG_MAN_BIN_PATH environment variable​. --list-options List available command options​.

ENVIRONMENT VARIABLESLTTNG_ABORT_ON_ERROR Set to 1 to abort the process after the first error is encountered​. LTTNG_HOME Overrides the $HOME environment variable​. Useful when the user running the commands has a non−writable home directory​. LTTNG_MAN_BIN_PATH Absolute path to the man pager to use for viewing help information about LTTng commands (using lttng-help(1) or lttng COMMAND --help)​. LTTNG_SESSION_CONFIG_XSD_PATH Path in which the session.xsd session configuration XML schema may be found​. LTTNG_SESSIOND_PATH Full session daemon binary path​. The --sessiond-path option has precedence over this environment variable​. Note that the lttng-create(1) command can spawn an LTTng session daemon automatically if none is running​. See lttng-sessiond(8) for the environment variables influencing the execution of the session daemon​.

FILES$LTTNG_HOME/.lttngrc User LTTng runtime configuration​. This is where the per−user current tracing session is stored between executions of lttng(1)​. The current tracing session can be set with lttng-set-session(1)​. See lttng-create(1) for more information about tracing sessions​. $LTTNG_HOME/lttng-traces Default output directory of LTTng traces​. This can be overridden with the --output option of the lttng-create(1) command​. $LTTNG_HOME/.lttng User LTTng runtime and configuration directory​. $LTTNG_HOME/.lttng/sessions Default location of saved user tracing sessions (see lttng-save(1) and lttng-load(1))​. /usr/local/etc/lttng/sessions System−wide location of saved tracing sessions (see lttng-save(1) and lttng-load(1))​. .it 1 an-trap
Note ¶.br $LTTNG_HOME defaults to $HOME when not explicitly set​.

EXIT STATUS0 Success 1 Command error 2 Undefined command 3 Fatal error 4 Command warning (something went wrong during the command)

BUGSIf you encounter any issue or usability problem, please report it on the LTTng bug tracker <https://bugs.lttng.org/projects/lttng-tools>​.

RESOURCES•  LTTng project website <https://lttng.org> •  LTTng documentation <https://lttng.org/docs> •  Git repositories <http://git.lttng.org> •  GitHub organization <http://github.com/lttng> •  Continuous integration <http://ci.lttng.org/> •  Mailing list <http://lists.lttng.org> for support and development: lttng-dev@lists.lttng.org •  IRC channel <irc://irc.oftc.net/lttng>: #lttng on irc.oftc.net

COPYRIGHTSThis program is part of the LTTng−tools project​. LTTng−tools is distributed under the GNU General Public License version 2 <http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html>​. See the LICENSE <https://github.com/lttng/lttng-tools/blob/master/LICENSE> file for details​.

THANKSSpecial thanks to Michel Dagenais and the DORSAL laboratory <http://www.dorsal.polymtl.ca/> at École Polytechnique de Montréal for the LTTng journey​. Also thanks to the Ericsson teams working on tracing which helped us greatly with detailed bug reports and unusual test cases​.

SEE ALSOlttng(1)
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Johanes Gumabo
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