Re: serverlog function (log_destination file)

Magnus Hagander wrote:

>Specifically about the logs, I still think there is a lot of value to
>being able to read the logs remotely even if you can't restart
>postmaster.
>
Since I believe that retrieving the logs easily without server file
access is a feature that's welcomed by many users, here's my proposal.

The attached diff will
- add a guc-variable log_filename
- extend log_destination to accept the keyword 'file'
- elog to that file if configured
- provide two functions pg_logfile_length() and pg_logfile to obtain the
contents.

int4 pg_logfile_length()
cstring pg_logfile(int4 size, int4 position)
size (may be null meaning max) is the chunk size (max: currently 50000)
position (may be null meaning -size) is the start position; positive
counting from log file start, negative from end.

Regards,
Andreas