configuring the postmaster.log

Hello,

I'm confused about the logging destination parameters in
postgresql.conf

My Problem is that the postmaster.log is getting too large and I want to
roll it (once per day)

Following parameters apply to optional postgresql...log.

log_rotation_age = 1440
log_filename = 'postgresql-%Y-%m-%d_%H.log'

Is there a way to use a similar definition for the postmaster.log ?

When I generate postgresql...log files, are log messages written in
both
postmaster.log and postgresql.log ?

I guess I don't understand the meaning of these two different logging
destination.

Moreover, I'm catching the error stream in a perl application to log
errors:

$sth = $dbh->prepare( "select ..." );
$sth->execute ()||
print (STDERR "PG error:" . $sth->errstr ."\n") && exit 1;
$sth->finish;

Will I still get the postgres error in perl if I set redirect_stderr =
on in postgresql.conf ?





Thanks,

Marc