'\" t
.\"     Title: lttng-sessiond
.\"    Author: [FIXME: author] [see http://www.docbook.org/tdg5/en/html/author]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 14 June 2021
.\"    Manual: LTTng Manual
.\"    Source: LTTng 2.13.15
.\"  Language: English
.\"
.TH "LTTNG\-SESSIOND" "8" "14 June 2021" "LTTng 2\&.13\&.15" "LTTng Manual"
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.nh
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.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
lttng-sessiond \- LTTng session daemon
.SH "SYNOPSIS"
.sp
.nf
\fBlttng\-sessiond\fR [\fB--background\fR | \fB--daemonize\fR] [\fB--sig-parent\fR]
               [\fB--config\fR=\fIPATH\fR] [\fB--group\fR=\fIGROUP\fR] [\fB--load\fR=\fIPATH\fR]
               [\fB--agent-tcp-port\fR=\fIPORT\fR]
               [\fB--apps-sock\fR=\fIPATH\fR] [\fB--client-sock\fR=\fIPATH\fR]
               [\fB--no-kernel\fR | [\fB--kmod-probes\fR=\fIPROBE\fR[,\fIPROBE\fR]\&...]
                              [\fB--extra-kmod-probes\fR=\fIPROBE\fR[,\fIPROBE\fR]\&...]
                              [\fB--kconsumerd-err-sock\fR=\fIPATH\fR]
                              [\fB--kconsumerd-cmd-sock\fR=\fIPATH\fR]]
               [\fB--ustconsumerd32-err-sock\fR=\fIPATH\fR]
               [\fB--ustconsumerd64-err-sock\fR=\fIPATH\fR]
               [\fB--ustconsumerd32-cmd-sock\fR=\fIPATH\fR]
               [\fB--ustconsumerd64-cmd-sock\fR=\fIPATH\fR]
               [\fB--consumerd32-path\fR=\fIPATH\fR] [\fB--consumerd32-libdir\fR=\fIPATH\fR]
               [\fB--consumerd64-path\fR=\fIPATH\fR] [\fB--consumerd64-libdir\fR=\fIPATH\fR]
               [\fB--event-notifier-error-buffer-size-kernel\fR=\fISLOTS\fR]
               [\fB--event-notifier-error-buffer-size-userspace\fR=\fISLOTS\fR]
               [\fB--quiet\fR | [\fB--verbose\fR]\&... [\fB--verbose-consumer\fR]]
.fi
.SH "DESCRIPTION"
.sp
The \fILinux Trace Toolkit: next generation\fR <https://lttng.org/> is an open\-source software package used for correlated tracing of the Linux kernel, user applications, and user libraries\&.
.sp
LTTng consists of Linux kernel modules (for Linux kernel tracing) and dynamically loaded libraries (for user application and library tracing)\&.
.sp
An LTTng session daemon, \fBlttng-sessiond\fR, is a program which:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Manages recording sessions (see
\fBlttng-concepts\fR(7)
to learn more about recording sessions)\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Controls the various components (like tracers and consumer daemons) of LTTng\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Sends asynchronous notifications to user applications\&.
.RE
.sp
A session daemon receives commands from the \fBlttng\fR(1) command\-line tool, as well as from any user application linked with the LTTng control library (\fBliblttng-ctl\fR)\&.
.sp
Each Unix user may have its own independent running session daemon\&. However, the \fBlttng\fR(1) tool must connect to the session daemon of the \fBroot\fR user (the root session daemon) to control Linux kernel tracing\&.
.sp
When you start \fBlttng-sessiond\fR as the \fBroot\fR Unix user, a non\-root Unix user can connect to it if it\(cqs part of the Unix tracing group\&. By default, the name of the tracing group is \fBtracing\fR\&. Override the tracing group name with the \fB--group\fR option\&.
.sp
See the \(lqSession daemon connection\(rq section of \fBlttng\fR(1) to learn how a user application connects to a session daemon\&.
.sp
A session daemon manages trace data consumer daemons, spawning them when necessary\&. You do NOT need to manage the consumer daemons yourself\&.
.sp
By default, \fBlttng-sessiond\fR doesn\(cqt start as a daemon\&. Make it a daemon with the \fB--daemonize\fR or \fB--background\fR option\&. With those options, \fBlttng-sessiond\fR ensures the daemon is ready to receive client commands before it exits\&.
.if n \{\
.sp
.\}
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBNote\fR
.ps -1
.br
.RS 4
.sp
The LTTng project recommends that you start the session daemon at boot time for stable and long\-term tracing\&.
.sp .5v
.RE
.if n \{\
.sp
.\}
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBNote\fR
.ps -1
.br
.RS 4
.sp
For an unprivileged Unix user running \fBlttng-sessiond\fR, the maximum number of file descriptors per process is usually 1024\&. This limits the number of traceable applications, since, for each instrumented application, there are two file descriptors per CPU as well as one socket for bidirectional communication\&.
.sp
For the \fBroot\fR user, the limit is usually 65,535\&.
.sp .5v
.RE
.SS "Daemon configuration"
.sp
When you run \fBlttng-sessiond\fR, it configures itself from, in this order:
.sp
.RS 4
.ie n \{\
\h'-04' 1.\h'+01'\c
.\}
.el \{\
.sp -1
.IP "  1." 4.2
.\}
The INI configuration file
\fB/usr/local/etc/lttng/lttng.conf\fR, if any\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04' 2.\h'+01'\c
.\}
.el \{\
.sp -1
.IP "  2." 4.2
.\}
The INI configuration file
\fB$LTTNG_HOME/.lttng/lttng.conf\fR, if any\&.
.sp
\fB$LTTNG_HOME\fR
defaults to
\fB$HOME\fR\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04' 3.\h'+01'\c
.\}
.el \{\
.sp -1
.IP "  3." 4.2
.\}
With the
\fB--config\fR=\fIPATH\fR
option: the INI configuration file
\fIPATH\fR\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04' 4.\h'+01'\c
.\}
.el \{\
.sp -1
.IP "  4." 4.2
.\}
The command\-line options\&.
.RE
.sp
Each step can override a previous configuration property\&.
.sp
In INI configuration files, the session daemon only reads the properties under the \fBsessiond\fR INI section\&. Each INI property is:
.PP
Key
.RS 4
The long name of a command\-line option to set (see the \(lqOPTIONS\(rq section below)\&.
.RE
.PP
Value
.RS 4
.PP
The selected command\-line option accepts an argument
.RS 4
Option argument (string)\&.
.RE
.PP
The selected command\-line option is a switch
.RS 4
.PP
\fBtrue\fR, \fByes\fR, \fBon\fR
.RS 4
Enable the option\&.
.RE
.PP
\fBfalse\fR, \fBno\fR, \fBoff\fR
.RS 4
Disable the option\&.
.RE
.RE
.RE
.sp
INI configuration file example:
.sp
.if n \{\
.RS 4
.\}
.nf
[sessiond]
daemonize=yes
extra\-kmod\-probes=my\-driver,other\-module
.fi
.if n \{\
.RE
.\}
.SS "Recording session configuration loading"
.sp
When the session daemon starts, it loads recording session configurations from:
.PP
Without the \fB--load\fR option
.RS 4
In this order:
.sp
.RS 4
.ie n \{\
\h'-04' 1.\h'+01'\c
.\}
.el \{\
.sp -1
.IP "  1." 4.2
.\}
All the files in
\fB$LTTNG_HOME/.lttng/sessions/auto\fR\&.
.sp
\fB$LTTNG_HOME\fR
defaults to
\fB$HOME\fR\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04' 2.\h'+01'\c
.\}
.el \{\
.sp -1
.IP "  2." 4.2
.\}
All the files in
\fB/usr/local/etc/lttng/sessions/auto\fR\&.
.RE
.sp
\fBlttng-sessiond\fR
only loads recording session configuration files from the directories above if its UID and their UID are the same\&.
.RE
.PP
With the \fB--load\fR=\fIPATH\fR option
.RS 4
.PP
\fIPATH\fR is a directory
.RS 4
All the files in
\fIPATH\fR\&.
.RE
.PP
\fIPATH\fR is a file
.RS 4
The file
\fIPATH\fR\&.
.RE
.RE
.SH "OPTIONS"
.SS "General daemon configuration"
.PP
\fB-b\fR, \fB--background\fR
.RS 4
Start as a Unix daemon, but keep file descriptors (console) open\&.
.sp
With this option,
\fBlttng-sessiond\fR
ensures the daemon is ready to receive client commands before it exits\&.
.sp
Use the
\fB--daemonize\fR
option instead to close the file descriptors\&.
.RE
.PP
\fB-f\fR \fIPATH\fR, \fB--config\fR=\fIPATH\fR
.RS 4
Configure the daemon using the INI configuration file
\fIPATH\fR
in addition to the default configuration files and the command\-line options\&.
.sp
See the \(lqDaemon configuration\(rq section above\&.
.RE
.PP
\fB-d\fR, \fB--daemonize\fR
.RS 4
Start as a Unix daemon and close file descriptors (console)\&.
.sp
With this option,
\fBlttng-sessiond\fR
ensures the daemon is ready to receive client commands before it exits\&.
.sp
Use the
\fB--background\fR
option instead to keep the file descriptors open\&.
.RE
.PP
\fB-g\fR \fIGROUP\fR, \fB--group\fR=\fIGROUP\fR
.RS 4
Set the Unix tracing group to
\fIGROUP\fR
instead of
\fBtracing\fR\&.
.sp
This option is only meaningful when the
\fBroot\fR
Unix user starts
\fBlttng-sessiond\fR\&.
.sp
Members of the Unix tracing group may connect to the root session daemon and, therefore, control LTTng kernel tracing\&.
.RE
.PP
\fB-l\fR \fIPATH\fR, \fB--load\fR=\fIPATH\fR
.RS 4
Load recording session configurations from
\fIPATH\fR, either a directory or a file, instead of loading them from the default search directories\&.
.sp
See the \(lqRecording session configuration loading\(rq section above\&.
.RE
.PP
\fB-S\fR, \fB--sig-parent\fR
.RS 4
Send the
\fBUSR1\fR
signal to the parent process to notify readiness\&.
.sp
You can also use the
\fB--daemonize\fR
or
\fB--background\fR
option, in which case
\fBlttng-sessiond\fR
ensures the daemon is ready to receive client commands before it exits\&.
.RE
.SS "Linux kernel tracing"
.sp
At most one of:
.PP
\fB--extra-kmod-probes\fR=\fIPROBE\fR[,\fIPROBE\fR]\&...
.RS 4
For each
\fIPROBE\fR
argument, load the LTTng kernel probe module named
\fBlttng-probe-\fR\fIPROBE\fR\fB.ko\fR, in addition to loading the default LTTng kernel probe modules\&.
.sp
See also the
\fBLTTNG_EXTRA_KMOD_PROBES\fR
environment variable\&.
.RE
.PP
\fB--kmod-probes\fR=\fIPROBE\fR[,\fIPROBE\fR]\&...
.RS 4
Only load, for each
\fIPROBE\fR
argument, the LTTng kernel probe module named
\fBlttng-probe-\fR\fIPROBE\fR\fB.ko\fR, instead of loading the default LTTng kernel probe modules\&.
.sp
See also the
\fBLTTNG_KMOD_PROBES\fR
environment variable\&.
.RE
.PP
\fB--no-kernel\fR
.RS 4
Disable Linux kernel tracing\&.
.RE
.SS "Paths and ports"
.PP
\fB--agent-tcp-port\fR=\fIPORT\fR
.RS 4
Listen on TCP port
\fIPORT\fR
for agent application registration instead of a port within the range [5345,\ \&5354])\&.
.RE
.PP
\fB-a\fR \fIPATH\fR, \fB--apps-sock\fR=\fIPATH\fR
.RS 4
Set the application Unix socket path to
\fIPATH\fR\&.
.RE
.PP
\fB-c\fR \fIPATH\fR, \fB--client-sock\fR=\fIPATH\fR
.RS 4
Set the client Unix socket path to
\fIPATH\fR\&.
.RE
.PP
\fB--consumerd32-libdir\fR=\fIPATH\fR
.RS 4
Set the 32\-bit consumer daemon library directory to
\fIPATH\fR\&.
.sp
See also the
\fBLTTNG_CONSUMERD32_LIBDIR\fR
environment variable\&.
.RE
.PP
\fB--consumerd32-path\fR=\fIPATH\fR
.RS 4
Set the 32\-bit consumer daemon binary path to
\fIPATH\fR\&.
.sp
See also the
\fBLTTNG_CONSUMERD32_BIN\fR
environment variable\&.
.RE
.PP
\fB--consumerd64-libdir\fR=\fIPATH\fR
.RS 4
Set the 64\-bit consumer daemon library directory to
\fIPATH\fR\&.
.sp
See also the
\fBLTTNG_CONSUMERD64_LIBDIR\fR
environment variable\&.
.RE
.PP
\fB--consumerd64-path\fR=\fIPATH\fR
.RS 4
Set the 64\-bit consumer daemon binary path to
\fIPATH\fR\&.
.sp
See also the
\fBLTTNG_CONSUMERD32_BIN\fR
environment variable\&.
.RE
.PP
\fB--kconsumerd-cmd-sock\fR=\fIPATH\fR
.RS 4
Set the command Unix socket path of the Linux kernel consumer daemon to
\fIPATH\fR\&.
.RE
.PP
\fB--kconsumerd-err-sock\fR=\fIPATH\fR
.RS 4
Set the error Unix socket path of the Linux kernel consumer daemon to
\fIPATH\fR\&.
.RE
.PP
\fB--ustconsumerd32-cmd-sock\fR=\fIPATH\fR
.RS 4
Set the Unix socket path of the 32\-bit consumer daemon command to
\fIPATH\fR\&.
.RE
.PP
\fB--ustconsumerd64-cmd-sock\fR=\fIPATH\fR
.RS 4
Set the Unix socket path of the 64\-bit consumer daemon command to
\fIPATH\fR\&.
.RE
.PP
\fB--ustconsumerd32-err-sock\fR=\fIPATH\fR
.RS 4
Set the Unix socket path of the 32\-bit consumer daemon error to
\fIPATH\fR\&.
.RE
.PP
\fB--ustconsumerd64-err-sock\fR=\fIPATH\fR
.RS 4
Set the Unix socket path of the 64\-bit consumer daemon error to
\fIPATH\fR\&.
.RE
.SS "Buffer size of event notifier error counters"
.PP
\fB--event-notifier-error-buffer-size-kernel\fR=\fISLOTS\fR
.RS 4
Set the size of the kernel event notifier error counter buffers to
\fISLOTS\fR\ \&slots\&.
.RE
.PP
\fB--event-notifier-error-buffer-size-userspace\fR=\fISLOTS\fR
.RS 4
Set the size of the user space event notifier error counter buffers to
\fISLOTS\fR\ \&slots\&.
.RE
.sp
As of LTTng\ \&2\&.13\&.15, a \fIslot\fR is a 32\-bit counter, but this may change in the future\&.
.SS "Verbosity"
.PP
\fB-q\fR, \fB--quiet\fR
.RS 4
Suppress all messages, including warnings and errors\&.
.sp
You may NOT use this option with the
\fB--verbose\fR
and
\fB--verbose-consumer\fR
options\&.
.RE
.PP
\fB-v\fR, \fB--verbose\fR
.RS 4
Increase verbosity\&.
.sp
Specify this option up to three times to get more levels of verbosity\&.
.sp
You may NOT use this option with the
\fB--quiet\fR
option\&.
.RE
.PP
\fB--verbose-consumer\fR
.RS 4
Increase the verbosity of the consumer daemons which this session daemon spawns\&.
.sp
You may NOT use this option with the
\fB--quiet\fR
option\&.
.RE
.SS "Program information"
.PP
\fB-h\fR, \fB--help\fR
.RS 4
Show help\&.
.sp
This option attempts to launch
\fB/usr/bin/man\fR
to view this manual page\&. Override the manual pager path with the
\fBLTTNG_MAN_BIN_PATH\fR
environment variable\&.
.RE
.PP
\fB--list-options\fR
.RS 4
List available command options and quit\&.
.RE
.PP
\fB-V\fR, \fB--version\fR
.RS 4
Show version and quit\&.
.RE
.SH "EXIT STATUS"
.PP
\fB0\fR
.RS 4
Success
.RE
.PP
\fB1\fR
.RS 4
Error
.RE
.PP
\fB3\fR
.RS 4
Fatal error
.RE
.SH "ENVIRONMENT"
.PP
\fBLTTNG_ABORT_ON_ERROR\fR
.RS 4
Set to
\fB1\fR
to abort the process after the first error is encountered\&.
.RE
.PP
\fBLTTNG_APP_SOCKET_TIMEOUT\fR
.RS 4
Timeout (in seconds) of the application socket when sending/receiving commands\&.
.sp
After this period of time,
\fBlttng-sessiond\fR
unregisters the application\&.
.sp
Set to
\fB0\fR
or
\fB-1\fR
to set an infinite timeout\&.
.sp
Default:
\fB5\fR\&.
.RE
.PP
\fBLTTNG_CONSUMERD32_BIN\fR
.RS 4
32\-bit consumer daemon binary path\&.
.sp
The
\fB--consumerd32-path\fR
option overrides this environment variable\&.
.RE
.PP
\fBLTTNG_CONSUMERD32_LIBDIR\fR
.RS 4
32\-bit consumer daemon library directory path\&.
.sp
The
\fB--consumerd32-libdir\fR
option overrides this environment variable\&.
.RE
.PP
\fBLTTNG_CONSUMERD64_BIN\fR
.RS 4
64\-bit consumer daemon binary path\&.
.sp
The
\fB--consumerd64-path\fR
option overrides this environment variable\&.
.RE
.PP
\fBLTTNG_CONSUMERD64_LIBDIR\fR
.RS 4
64\-bit consumer daemon library directory path\&.
.sp
The
\fB--consumerd64-libdir\fR
option overrides this environment variable\&.
.RE
.PP
\fBLTTNG_DEBUG_NOCLONE\fR
.RS 4
Set to
\fB1\fR
to disable the use of
\fBclone\fR(2)/\fBfork\fR(2)\&.
.sp
Setting this environment variable is considered insecure, but it\(cqs required to allow debuggers to work with
\fBlttng-sessiond\fR
on some operating systems\&.
.RE
.PP
\fBLTTNG_EXTRA_KMOD_PROBES\fR
.RS 4
Extra LTTng kernel probe modules to load\&.
.sp
See the
\fB--extra-kmod-probes\fR
option which overrides this environment variable\&.
.RE
.PP
\fBLTTNG_KMOD_PROBES\fR
.RS 4
Exclusive LTTng kernel probe modules to load\&.
.sp
See the
\fB--kmod-probes\fR
option which overrides this environment variable\&.
.RE
.PP
\fBLTTNG_NETWORK_SOCKET_TIMEOUT\fR
.RS 4
Socket connection, receive, and send timeout (milliseconds)\&.
.sp
Set to
\fB0\fR
or
\fB-1\fR
to use the timeout of the operating system (default)\&.
.RE
.PP
\fBLTTNG_SESSION_CONFIG_XSD_PATH\fR
.RS 4
Recording session configuration XML schema definition (XSD) path\&.
.RE
.SH "FILES"
.PP
\fB$LTTNG_HOME/.lttng\fR
.RS 4
Unix user\(cqs LTTng runtime and configuration directory\&.
.RE
.PP
\fB$LTTNG_HOME/lttng-traces\fR
.RS 4
Default output directory of LTTng traces in local and snapshot modes\&.
.sp
Override this path with the
\fB--output\fR
option of the
\fBlttng-create\fR(1)
command\&.
.RE
.PP
\fB$LTTNG_HOME/.lttng/sessions/auto\fR
.RS 4
Directory from which
\fBlttng-sessiond\fR
loads Unix user recording session configurations when starting\&.
.sp
See the \(lqRecording session configuration loading\(rq section above to learn more\&.
.RE
.PP
\fB/usr/local/etc/lttng/sessions/auto\fR
.RS 4
Directory from which
\fBlttng-sessiond\fR
loads system\-wide recording session configurations when starting\&.
.sp
See the \(lqRecording session configuration loading\(rq section above to learn more\&.
.RE
.PP
\fB$LTTNG_HOME/.lttng/lttng.conf\fR
.RS 4
Unix user\(cqs LTTng daemon INI configuration file\&.
.sp
See the \(lqDaemon configuration\(rq section above to learn more\&.
.RE
.PP
\fB/usr/local/etc/lttng/lttng.conf\fR
.RS 4
System\-wide LTTng daemon INI configuration file\&.
.sp
See the \(lqDaemon configuration\(rq section above to learn more\&.
.RE
.if n \{\
.sp
.\}
.it 1 an-trap
.nr an-no-space-flag 1
.nr an-break-flag 1
.br
.ps +1
\fBNote\fR
.ps -1
.br
.RS 4
.sp
\fB$LTTNG_HOME\fR defaults to \fB$HOME\fR\&.
.sp .5v
.RE
.SH "RESOURCES"
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
LTTng project website <https://lttng.org>
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
LTTng documentation <https://lttng.org/docs>
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
LTTng bug tracker <https://bugs.lttng.org>
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Git repositories <https://git.lttng.org>
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
GitHub organization <https://github.com/lttng>
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Continuous integration <https://ci.lttng.org/>
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
Mailing list <https://lists.lttng.org/>
for support and development:
\fBlttng-dev@lists.lttng.org\fR
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
IRC channel <irc://irc.oftc.net/lttng>:
\fB#lttng\fR
on
\fBirc.oftc.net\fR
.RE
.SH "COPYRIGHT"
.sp
This program is part of the LTTng\-tools project\&.
.sp
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 \fBLICENSE\fR <https://github.com/lttng/lttng-tools/blob/master/LICENSE> file for details\&.
.SH "THANKS"
.sp
Special thanks to Michel Dagenais and the DORSAL laboratory <http://www.dorsal.polymtl.ca/> at \('Ecole Polytechnique de Montr\('eal for the LTTng journey\&.
.sp
Also thanks to the Ericsson teams working on tracing which helped us greatly with detailed bug reports and unusual test cases\&.
.SH "SEE ALSO"
.sp
\fBlttng\fR(1), \fBlttng-concepts\fR(7)