Logging

Source

Logging on webOS TV is handled by PmLogDaemon service. It is similar to most other system logging daemons. Most log messages are dumped into /var/log/messages (though some are routed into different paths - see configuration in /etc/pmlog.d/)

By default, on retail software, only messages of certain types from specific sources are logged into a file - configured in /etc/PmLogDaemon/whitelist.txt.

In order to disable log whitelisting certain luna calls need to be executed.

# webOS 4.x+
luna-send -n 1 -f luna://com.webos.service.config/setConfigs '{"configs": {"system.collectDevLogs": true}}'

# webOS 3.x and older
luna-send -n 1 -f 'luna://com.webos.pmlogd/setdevlogstatus' '{"recordDevLogs":true}'

Then log levels can be adjusted using PmLogCtl:

# List all contexts. These only show up after a first message on a specific
# context.
PmLogCtl show

# Adjust log level
PmLogCtl set WAM debug

# Bulk adjust
PmLogCtl set '*' none

Then logs can be viewed by running:

tail -F /var/log/messages

Keep in mind /var/log/messages file is rotated, thus setting too high logging level may cause it to drop messages (even when using -F flag)

PmLogLib stub

Alternatively (on non-rooted devices) a PmLogLib library stub can be used that will print out logs into standard output.

Crashlogs

Crash logs are dumped into /var/log/reports/librdx/ or /tmp/faultmanager/crash/. These are gzipped text files containing process information, memory maps, backtrace and some memory dumps. These are automatically reported to LG unless rdxd is locked up (like what rootmy.tv/homebrew channel does on startup)

Crashes may also cause alert popups on screen if system is running in DEBUG mode.

Crashlog dumping can be disabled by settings SEGFAULT_SIGNALS to empty string before launch, like so:

SEGFAULT_SIGNALS= ./buggy-binary

Links