08-18-2015
minix is a very basic OS, up to you to make it more rich.. I think it is the best start for anyone wanting to understand what is going on in a basic OS since if you follow the book you should end with a working basic system, then as I said up to you to use GNU stuff to enrich your OS now you are a master in C compilation
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LEARN ABOUT LINUX
snmpm_network_interface_filter
snmpm_network_interface_filter(3erl) Erlang Module Definition snmpm_network_interface_filter(3erl)
NAME
snmpm_network_interface_filter - Behaviour module for the SNMP manager network-interface filter.
DESCRIPTION
This module defines the behaviour of the manager network interface filter. A snmpm_network_interface_filter compliant module must export
the following functions:
* accept_recv/2
* accept_send/2
* accept_recv_pdu/3
* accept_send_pdu/2
The semantics of them and their exact signatures are explained below.
The purpose of the network interface filter is to allow for filtering of messages (accept or reject) receive and send. This is done on two
levels:
* The first level is at the UDP entry / exit point, i.e. immediately after the receipt of the message, before any message processing is
done (accept_recv) and immediately before sending the message, after all message processing is done (accept_send).
* The second level is at the MPD entry / exit point, i.e. immediately after the basic message processing (accept_recv_pdu) / immediately
before the basic message processing (accept_send_pdu).
Note that the network interface filter is something which is used by the network interface implementation provided by the application (
snmpm_net_if ). The default filter accepts all messages.
A network interface filter can e.g. be used during testing or for load regulation.
DATA TYPES
port() = integer() > 0
pdu_type() = 'get-request' | 'get-next-request' | 'get-response' | 'set-request' | trap | 'get-bulk-request' | 'inform-request' | report | trappdu
EXPORTS
accept_recv(Addr, Port) -> boolean()
Types Addr = ip_address()
Port = port()
Called at the reception of a message (before any processing has been done).
For the message to be rejected, the function must return false .
accept_send(Addr, Port) -> boolean()
Types Addr = ip_address()
Port = port()
Called before the sending of a message (after all processing has been done).
For the message to be rejected, the function must return false .
accept_recv_pdu(Addr, Port, PduType) -> boolean()
Types Addr = ip_address()
Port = port()
PduType = pdu_type()
Called after the basic message processing (MPD) has been done, but before the pdu is handed over to the server for primary process-
ing.
For the pdu to be rejected, the function must return false .
accept_send_pdu(Addr, Port, PduType) -> boolean()
Types Addr = ip_address()
Port = port()
PduType = pdu_type() > 0
Called before the basic message processing (MPD) is done, when a pdu has been received from the master-agent.
For the message to be rejected, the function must return false .
Ericsson AB snmp 4.19 snmpm_network_interface_filter(3erl)