Add a log_file_mode GUC that allows control of the file permissions set on

log files created by the syslogger process.

In passing, make unix_file_permissions display its value in octal, same
as log_file_mode now does.

Martin Pihlak

src/backend/utils/misc/postgresql.conf.sample

@@ -269,6 +269,8 @@
 					# can be absolute or relative to PGDATA
 #log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'	# log file name pattern,
 					# can include strftime() escapes
+#log_file_mode = 0600			# creation mode for log files,
+					# begin with 0 to use octal notation
 #log_truncate_on_rotation = off		# If on, an existing log file of the
 					# same name as the new log file will be
 					# truncated rather than appended to.