pg(3erl) [linux man page]

pg(3erl)						     Erlang Module Definition							  pg(3erl)

NAME

       pg - Distributed, Named Process Groups

DESCRIPTION

       This  (experimental)  module  implements process groups. A process group is a group of processes that can be accessed by a common name. For
       example, a group named foobar can include a set of processes as members of this group and they can be located on different nodes.

       When messages are sent to the named group, all members of the group receive the message. The messages are serialized.  If  the  process	P1
       sends  the message M1 to the group, and process P2 simultaneously sends message M2 , then all members of the group receive the two messages
       in the same order. If members of a group terminate, they are automatically removed from the group.

       This module is not complete. The module is inspired by the ISIS system and the causal order protocol of the  ISIS  system  should  also	be
       implemented. At the moment, all messages are serialized by sending them through a group master process.

EXPORTS

       create(PgName) -> ok | {error, Reason}

	      Types  PgName = term()
		     Reason = already_created | term()

	      Creates an empty group named PgName on the current node.

       create(PgName, Node) -> ok | {error, Reason}

	      Types  PgName = term()
		     Node = node()
		     Reason = already_created | term()

	      Creates an empty group named PgName on the node Node .

       join(PgName, Pid) -> Members

	      Types  PgName = term()
		     Pid = pid()
		     Members = [pid()]

	      Joins the pid Pid to the process group PgName . Returns a list of all old members of the group.

       send(PgName, Msg) -> void()

	      Types  PgName = Msg = term()

	      Sends the tuple {pg_message, From, PgName, Msg} to all members of the process group PgName .

	      Failure: {badarg, {PgName, Msg}} if PgName is not a process group (a globally registered name).

       esend(PgName, Msg) -> void()

	      Types  PgName = Msg = term()

	      Sends the tuple {pg_message, From, PgName, Msg} to all members of the process group PgName , except ourselves.

	      Failure: {badarg, {PgName, Msg}} if PgName is not a process group (a globally registered name).

       members(PgName) -> Members

	      Types  PgName = term()
		     Members = [pid()]

	      Returns a list of all members of the process group PgName .

Ericsson AB							   stdlib 1.17.3							  pg(3erl)

snmpm_network_interface(3erl)				     Erlang Module Definition				     snmpm_network_interface(3erl)

NAME

       snmpm_network_interface - Behaviour module for the SNMP manager network interface.

DESCRIPTION

       This  module  defines  the behaviour of the manager network interface. A snmpm_network_interface compliant module must export the following
       functions:

	 * start_link/2

	 * stop/1

	 * send_pdu/7

	 * inform_response/4

	 * note_store/2

	 * info/1

	 * get_log_type/1

	 * set_log_type/2

	 * verbosity/2

       The semantics of them and their exact signatures are explained below.

EXPORTS

       start_link(Server, NoteStore) -> {ok, Pid} | {error, Reason}

	      Types  Server = pid()
		     NoteStore = pid()

	      Start-link the network interface process.

	      Server is the pid of the managing process.

	      NoteStore is the pid of the note-store process.

       stop(Pid) -> void()

	      Types  Pid = pid()

	      Stop the network interface process.

       send_pdu(Pid, Pdu, Vsn, MsgData, Addr, Port, ExtraInfo) -> void()

	      Types  Pid = pid()
		     Pdu = pdu()
		     Vsn = 'version-1' | 'version-2' | 'version-3'
		     MsgData = term()
		     Addr = address()
		     Port = integer()
		     ExtraInfo = term()

	      Request the network interface process ( Pid ) to send this pdu ( Pdu ).

	      ExtraInfo is some opaque data that is passed to the net-if process. It originates from the ExtraInfo parameter in the calls  to  the
	      synchronous get-request , asynchronous get-request , synchronous get-next-request , asynchronous get-next-request , synchronous set-
	      request and asynchronous set-request functions. Whether the net-if process chooses to use this is implementation dependent. The net-
	      if process included in this application ignores it.

       inform_response(Pid, Ref, Addr, Port) -> void()

	      Types  Pid = pid()
		     Ref = term()
		     Addr = address()
		     Port = integer()

	      Instruct the network interface process to send the response (acknowledgment) to an inform-request.

	      Ref is something that can be used to identify the inform-request, e.g. request-id of the inform-request.

	      Addr and Port identifies the agent, from which the inform-request originated.

       note_store(Pid, NoteStore) -> void()

	      Types  Pid = pid()
		     NoteStore = pid()

	      Change the pid of the note-store process. This is used when the server re-starts the note_store (e.g. after a crach).

       info(Pid) -> [{Key, Value}]

	      Types  Pid = pid()

	      The  info returned is basically up to the implementer to decide. The implementation provided by this application provides info about
	      memory allocation and various socket information.

	      The info returned by this function is returned together with other info collected by the manager when the info  function	is  called
	      (tagged with the key net_if ).

       verbosity(Pid, Verbosity) -> void()

	      Types  Pid = pid()
		     Verbosity = verbosity()

	      Change the verbosity of the network interface process.

       get_log_type(Pid) -> {ok, LogType} | {error, Reason}

	      Types  Pid = pid()
		     LogType = atl_type()
		     Reason = term()

	      The Audit Trail Log is managed by the network interface process. So, it is this process that has to return the actual log-type.

       set_log_type(Pid, NewType) -> {ok, OldType} | {error, Reason}

	      Types  Pid = pid()
		     NewType = OldType = atl_type()
		     Reason = term()

	      The  Audit  Trail  Log is managed by the network interface process. So, it is this process that has to do the actual changing of the
	      type.

	      See set_log_type for more info.

Ericsson AB							     snmp 4.19					     snmpm_network_interface(3erl)