LPRng-HOWTO: 15 Oct 2001 (For LPRng-3.7.9)
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# 15.11. 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_date` FLAG put date information in control file

- `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_date` flag forces a date value to be placed in a control file if there is none.

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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