logger

Synopsis:

logger filter[,filter,...] output_dest

Options:

filter[,filter,...]: Output information for the specified message types. Specify one or more types, separated by commas (see below).
output_dest: The output destination for the messages specified by the filters. Specify only one output per logger instance. Supported destinations are stdout, stderr, slog, and none. Note that slog stands for “system logger”, which is slogger2.

Description:

You may specify from zero to many logger options for a VM.

Log messages are filtered by the severity of the condition that caused a message to be emitted. Supported message severity types are:

Filter	Severity
`fatal`	A fatal error was detected; the qvm process can't continue.
`internal`	An internal error in the qvm process was detected; the process terminates right away.
`error`	An error that may or may not cause the qvm process to stop, but does indicate a problem that requires immediate attention, was detected.
`warn`	The qvm process can continue, but has encountered a problem that should be addressed.
`info`	Output information is requested by the user (e.g., in response to a SIGUSR1 signal).
`debug`	Provides information useful to QNX when debugging user-reported issues.
`verbose`	Provides users with detailed information useful for debugging their system.

Note: The hypervisor always sends internal error logs to the slog output destination. Thus, logger internal slog is always on.

Using logger filters

Filters are not like verbosity levels, where each level outputs increasingly trivial messages. Filters are combined. You must specify the filter for every type of message you want to output. For example, specifying logger error stderr outputs only errors. It doesn't output errors and fatal errors. To get both, you must specify logger error,fatal stderr.

Default configuration

If no logger option is specified in the qvm configuration file, to ensure that all information, warning, and error-related messages of any type are sent to stderr, the following logger configuration is assumed:

logger fatal,internal,error,warn,info stderr

Examples:

An explicit configuration overrides the default configuration. For example:

logger error,warn,info slog

overrides the default output location (i.e., stderr), and directs output to slog only.

If you want to output to both stderr and slog, you must specify both output destinations separately, as follows:

logger error,warn,info slog
logger error,warn,info stderr

By default, certain log messages are directed to stderr. Using the none output destination tells a log filter to not log certain messages at all:

logger info,verbose none

In this case, the none destination is specified for info and verbose, meaning these message types aren't logged.

In the following logger option examples, only one output destination is specified per line:

logger warn,error,fatal stderr
logger info stdout
logger error,fatal,info,warn slog
logger error,fatal,info,warn stderr
logger internal,debug slog

Note that error,fatal,info,warn is repeated to direct the output to both slog and stderr.