# lttng-disable-event

## NAME



           lttng-disable-event - Disable LTTng event rules
    


## SYNOPSIS



           **lttng**[_GENERAL OPTIONS_] **disable-event**
                 (**--kernel**[**--probe** | **--function** | **--syscall**] |
                  **--userspace** | **--jul** | **--log4j** | **--python**)
                 [**--session** =_SESSION_] [**--channel** =_CHANNEL_]
                 (**--all-events** | _EVENT_[,_EVENT_]...)
    


## DESCRIPTION



           The **lttng disable-event** command disables one or more event rules
           previously enabled by the lttng-enable-event(1) command.
    
           Event rules are always assigned to a channel when they are
           created. If the **--channel** option is omitted, the default channel
           named **channel0** is used.
    
           If the **--session** option is omitted, the chosen channel is picked
           from the current tracing session.
    
           If the **--all-events** option is used, all the existing event rules
           of the chosen domain are disabled. Otherwise, at least one event
           rule to disable named _EVENT_ must be specified.
    
           With the **--kernel** option, the event source type can be specified
           using one of the **--tracepoint** , **--probe** , **--function** , or **--syscall**
           options. See lttng-enable-event(1) for more details about event
           source types.
    
           Events can be disabled while tracing is active (use lttng-start(1)
           to make a tracing session active).
    


## OPTIONS



           General options are described in lttng(1).
    
       **Domain**
           One of:
    
           **-j** , **--jul**
               Disable event rules in the **java.util.logging**(JUL) domain.
    
           **-k** , **--kernel**
               Disable event rules in the Linux kernel domain.
    
           **-l** , **--log4j**
               Disable event rules in the Apache log4j domain.
    
           **-p** , **--python**
               Disable event rules in the Python domain.
    
           **-u** , **--userspace**
               Disable event rules in the user space domain.
    
       **Target**
           **-c** _CHANNEL_ , **--channel** =_CHANNEL_
               Disable event rules in the channel named _CHANNEL_ instead of
               the default channel name **channel0**.
    
           **-s** _SESSION_ , **--session** =_SESSION_
               Disable event rules in the tracing session named _SESSION_
               instead of the current tracing session.
    
       **Event source type**
           One of:
    
           **--function**
               Linux kernel kretprobe. Only available with the **--kernel**
               domain option.
    
           **--probe**
               Linux kernel kprobe. Only available with the **--kernel** domain
               option.
    
           **--syscall**
               Linux kernel system call. Only available with the **--kernel**
               domain option.
    
           **--tracepoint**
               Linux kernel or application tracepoint. Only available with
               the **--kernel** domain option (default Linux kernel domain event
               source type).
    
       **Disabling**
           **-a** , **--all-events**
               Disable all enabled event rules in the chosen tracing session,
               tracing domain, and channel.
    
       **Program information**
           **-h** , **--help**
               Show command help.
    
               This option, like lttng-help(1), attempts to launch
               **/usr/bin/man** to view the command’s 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 VARIABLES



           **LTTNG_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)).
    
               **Note**
    
               **$LTTNG_HOME** defaults to **$HOME** when not explicitly set.
    


## EXIT STATUS



           **0**
               Success
    
           **1**
               Command error
    
           **2**
               Undefined command
    
           **3**
               Fatal error
    
           **4**
               Command warning (something went wrong during the command)
    


## BUGS



           If 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**
    


## THANKS



           Special 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.
    


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