LPRng Reference Manual: 3 May 2004 (For LPRng-3.8.27)
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# 15.12. Debugging

Options used:

- debugging=debugging options

- full_time FLAG full or extended time format

- ms_time_resolution FLAG millisecond time resolution

- syslog_device=syslog alternative device

- use_info_cache FLAG cache printcap and other information

The LPRng software has a very powerful debugging capability. Since most printing problems occur on remote systems where it is impossible to run debuggers, and since most systems do not do core dumps of SETUID ROOT programs, the LPRng software provides a very verbose set of log file trace messages.

First, serious errors or other information are logged using the `syslog()` facilities. If these are not present on a system, then the messages are logged to the device specified by syslog_device.

For client programs, the debugging options are specified on the command line and output is directed to STDERR. For the lpd server, debugging commands can be specified on the command line OR as the db=options printcap value. Output is directed to the log file (lf option value, default log).

A typical debug entry has the format 2,network+1,database. This sets the general debugging level to 2, network debugging to 1 and the database debugging level to the default. The following debugging options and levels are supported.

- nnn - general purpose debugging level

- network - network debugging

- database - database debugging

- receive - job or command reception debugging

- print - detailed job printing debugging

The full_time flag forces the logging and other information which has timestamps to have a full (year, month, day, etc.) timestamp. The ms_time_resolution flag forces millisecond time resolution in the time stamp.

The use_info_cache (default ON) causes lpd to cache printcap and configuration information. This is desirable except when trying to change values in printcap files and test the results. By using use_info_cache@ in the configuration information, you can get immediate responses. Also, see lpc reread for another method.

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