wlog(1)
NAME
wLog - WinPR logging facility
DESCRIPTION
wLog is a configurable and flexible logging system used throughout WinPR and FreeRDP. The primary concept is to have a hierarchy of loggers that can be be configured independently.
Appenders
WLog uses different appenders that define where the log output should
be written to. If the application doesn't explicitly configure the
appenders the below described variable WLOG_APPENDER can be used to
choose one appender.
The following kind of appenders are available:
Binary Write the log data into a binary format file.
Console
The console appender writes to the console. Depending of the
operating system the application runs on, the output might be
handled differently. For example on android log print would be
used.
File The file appender writes the textual output to a file.
Udp This appender sends the logging messages to a pre-defined remote
host via UDP.
If no target is set the default one 127.0.0.1:20000 is used. To
receive the log messages one can use netcat. To receive the
default target the following command can be used: nc -u
127.0.0.1 -p 20000 -l
Syslog Use syslog for outputting the debug messages.
Journald
This appender outputs messages to journald.
Levels
The WLog are complementary, the higher level always includes the lower ones. The level list below is top down. Top the highest level. TRACE print everything including packets dumps DEBUG debug messages INFO general informations WARN warnings ERROR errors FATAL fatal problems OFF completely disable the wlog output
Formats
The format a logger prints has the following possible options: lv log level mn module name fl file name fn function ln line number pid process id tid thread id yr year mo month dw day of week hr hour mi minute se second ml millisecond A maximum of 16 options can be used per format string. An example that generally sets the WLOG_PREFIX for xfreerdp would look like: WLOG_PREFIX="pid=%pid:tid=%tid:fn=%fn -" xfreerdp /v:xxx
ENVIRONMENT
WLOG_APPENDER
The kind of appender, the accepted values are: CONSOLE, FILE,
BINARY, SYSLOG, JOURNALD or UDP
WLOG_PREFIX
configure the prefix used for outputting the message (see Format
for more details and examples)
WLOG_LEVEL
the level to output messages for
WLOG_FILTER
sets a filter for WLog messages. Only the filtered messages are
printed. The format of the filter is a serie of <logger
name>:<level> separated by comas
example: WLOG_FILTER=core.channel:DEBUG,dummy:TRACE will display
debug messages for the core.channel logger and trace level for
the dummy logger
WLOG_FILEAPPENDER_OUTPUT_FILE_PATH
When using the file appender it may contains the output log
file's path
WLOG_FILEAPPENDER_OUTPUT_FILE_NAME
When using the file appender it may contains the output log
file's name
WLOG_JOURNALD_ID
When using the systemd journal appender, this variable contains
the id used with the journal (by default the executable's name)
WLOG_UDP_TARGET
target to use for the UDP appender in the format host:port
BUGS
Please report any bugs using the bug reporting form on the FreeRDP web site
SEE ALSO
Additional information and the latest version is available at the web site: http://www.freerdp.com
AUTHOR
David Fort <contact@hardening-consulting.com> wrote this manpage from materials written by Bernhard Miklautz <bernhard.miklautz@thincast.com>.
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