This topic summarizes how to use Legato logging. Legato creates log messages in LE_INFO() by default, but only minimal information is reported, and only for the current app: essentially logs if the app is communicating. You need to modify default settings to enable monitoring for other services, etc.

There are two built-in features to control logging using the Logging Tool or Logging API. There are also App Crash Logs.

Access Logs

Run logread on the target to view the system log.

Run logread -f to start monitoring the logs and display messages as they are logged.

The installed app's output LE_INFO() log message will appear in the target's system log (syslog).

Logging Tool

The target log tool is the easiest way to set logging controls. You can control what's being logged, filter levels, trace keywords, and processes all through the command-line in a running system.

Run log level INFO "processName/componentName" to set the log level to INFO for the specified component in a process.

Run log trace "keyword" "processName/componentName" to use a keyword trace.

See log for details.

Logging API

The Logging API provides a toolkit to set error, warning, info, and debugging messages with macros and condition support including default environment variable controls that can be output to different devices and formats.

See Logging API for details.

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