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wLog(7) 2.0 wLog(7) 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 con- figured 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 appen- der. The following kind of appenders are available: Binary Write the log data into a binary format file. ConsoleThe console appender writes to the console. Depending of the operat- ing system the application runs on, the output might be handled dif- ferently. 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 re- ceive 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 information 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, BI- NARY, 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 series of <logger name>:<level> separated by comas example: WLOG_FILTER=core.channel:DEBUG,dummy:TRACE will display de- bug 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 mate- rials written by Bernhard Miklautz <bernhard.miklautz@thincast.com>. Version June 2016 wLog(7)
NAME | DESCRIPTION | Appenders | Levels | Formats | ENVIRONMENT | BUGS | SEE ALSO | AUTHOR
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