snmpa_mib_data

snmpa_mib_data

snmpa_mib_data
Behaviour module for the SNMP agent mib-server data module.
Module snmpa_mib_data was introduced in OTP R16B01.

This module defines the behaviour of the SNMP agent mib-server data module. A snmpa_mib_data compliant module must export the following functions:

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

Note that the data extracted from the imported (loaded) mibs are stored partly by the mib-server and partly by the symbolic-store server. See the default mib-server data module, snmpa_mib_data_tttn for details.

The following functions must be exported from a mib-server data callback module:

Types

Storage = mib_storage()
State = term()

Create a new mib-server data instance.

Types

State = term()

Close the mib-storage.

Types

State = term()

Synchronize (write to disc, if possible) the mib-server data. This depends on the mib_storage option, and will only have an effect if the mib-storage option has an actual disc component (such as dets, or ets with a file).

Types

State = NewState = term()
Filename = filename()
MeOverride = boolean()
TeOverride = boolean()
Reason = already_loaded | term()

Load the mib specified by the Filename argument into the mib-server. The MeOverride and TeOverride arguments specifies how the mib-server shall handle duplicate mib- and trap- entries.

Types

State = NewState = term()
Filename = filename()
Reason = not_loaded | term()

Unload the mib specified by the Filename argument from the mib-server.

Types

State = term()
Reply = {variable, ME} | {table_column, ME, TEOid} | {subagent, SAPid, SAOid} | {false, Reason}
Oid = TEOid = SAOid = oid()
SAPid = pid()
ME = me()
Reason = term()

Find the mib-entry corresponding to the Oid. If it is a variable, the Oid must be <Oid for var>.0 and if it is a table, Oid must be <table>.<entry>.<col>.<any>.

Types

State = term()
Reply = false | endOfTable | {subagent, SAPid, SAOid} | {variable, ME, VarOid} | {table, TableOid, TableRestOid, ME}
Oid = SAOid = VarOid = TableOid = TableRestOid = oid()
SAPid = pid()
ME = me()

Finds the lexicographically next oid.

Types

State = NewState = term()
Reply = {ok, NewState} | {error, Reason}
Oid = oid()
Pid = pid()
Reason = term()

Register the subagent, process, handling part of the mib-tree.

Types

State = NewState = term()
Reply = {ok, NewState} | {ok, NewState, Pid} | {error, Reason}
PidOrOid = pid() | oid()
Pid = pid()
Reason = term()

Unregister the subagent, handling part of the mib-tree, as specified by the oid() or pid() (PidOrOid).

When unregister the subagent using an oid(), the pid() of the process handling the sub-tree is also returned.

Types

State = term()
Reply = ok | {error, Reason}
Destination = io | filename()
Pid = pid()
Reason = term()

Dump the mib-server data to stdio (Destination = io) or the specified file.

Types

State = term()
Reply = {ok, MibFile} | {error, Reason}
Oid = oid()
MibFile = string()
Reason = term()

Retrieve the mib-file to which an given oid() belongs.

Types

State = term()
Reply = [{MibName, Filename}]
MibName = atom()
Filename = string()

Retrieve all loaded mib-files.

Types

State = term()
MibName = atom()
Reply = {ok, Filename} | {error, Reason}
Filename = string()
Reason = term()

Retrieve the mib file for the mib.

Types

State = term()
Reply = {ok, Filename} | {error, Reason}
Filename = string()
Reason = term()

Retrieve misc info for the mib data.

This is a utility function used to inspect, for instance, memory usage, in a simple way.

Types

State = term()
Reply = ok | {error, Reason}
BackupDir = string()
Reason = term()

Perform a backup of the mib-server data.

Note that its implementation dependant (and also dependent on mib-storage is used) if a backup is possible.

Types

Destination = up | down
Vsn = term()
Extra = term()
State = NewState = term()

Perform a code-change (upgrade or downgrade).

See gen_server for more info regarding the Vsn and Extra arguments.

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