Re: [AMaViS-user] Taking note of map changes while amavisd-new is running?

[Mark M. <Mar...@ij...>]

Patrick,

> The scenario:
> 1. amavisd reads in a file upon startup e.g. using read_hash for
>    @local_domains_maps to read in a list of domains and subdomains
> 2. The file is edited while amavisd is running
>
> Question:
> Will amavisd children take notice of the changes when they restart after
> $max_request or do I need to restart the master server process?

As Gary noted, a change in a config file (and effect of any calls
executed from config file(s)) will only take effect on start
of a master process, i.e. on 'amavisd start' or 'amavisd reload'.

The read_hash, read_array, read_text, they all read data into memory,
just like direct assignements to variables in the rest of a config file.

The only lookups that are dynamic in a sense that data may be changing
on-the-fly and take effect immediately on a next lookup, are SQL and
LDAP lookups.

In principle a hash (i.e. an associative array) could be 'tie'-d
to a database such as a Berkeley DB, or cdb, gdb ...
(tie() is a Perl function). In this case Perl would hide such
association from a program and the effect would be a dynamic
lookup into a file-based database on each hash lookup by amavisd,
changes to a database could take effect immediately (subject to
possible caching). This is seldom used, mostly because explicit
locking would be required for a reliable access to a changing
database tied to a hash.

  Mark