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# snmpa_supervisor (snmp v5.20.4)

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A supervisor for the SNMP agent Processes

This is the top supervisor for the agent part of the SNMP application. There is always one supervisor at each node with an SNMP agent (master agent or sub-agent).

## Summary

### Functions

start_master_sup(Opts)

Starts a supervisor for the SNMP agent system. The supervisor starts all involved SNMP processes, including the master agent. Sub-agents should be started by calling `start_subagent/3`.

start_sub_agent(ParentAgent, Subtree, Mibs)

Starts a sub-agent on the node where the function is called. The `snmpa_supervisor` must be running.

start_sub_sup(Opts)

Starts a supervisor for the SNMP agent system without a master agent. The supervisor starts all involved SNMP agent processes, but no agent processes. Sub-agents should be started by calling `start_sub_agent/3`.

stop_sub_agent(SubAgentPid)

Stops the sub-agent on the node where the function is called. The `snmpa_supervisor` must be running.

## Functions

# start_master_sup(Opts)

    -spec start_master_sup(Opts) -> {ok, Pid} | {error, Reason}
                              when
                                  Opts :: [Opt],
                                  Opt :: {db_dir, string()} | {config, ConfOpts} | {atom(), term()},
                                  ConfOpts :: [ConfOpt],
                                  ConfOpt :: {dir, string()} | {atom(), term()},
                                  Pid :: pid(),
                                  Reason :: {already_started, Pid} | term().

Starts a supervisor for the SNMP agent system. The supervisor starts all involved SNMP processes, including the master agent. Sub-agents should be started by calling `start_subagent/3`.

`db_dir` is mandatory.

`dir` in config is mandatory.

See snmp config for a description of the options.

# start_sub_agent(ParentAgent, Subtree, Mibs)

    -spec start_sub_agent(ParentAgent, Subtree, Mibs) -> {ok, Pid} | {error, Reason}
                             when
                                 ParentAgent :: pid(),
                                 Subtree :: snmp:oid(),
                                 Mibs :: [MibName],
                                 MibName :: string(),
                                 Pid :: pid(),
                                 Reason :: term().

Starts a sub-agent on the node where the function is called. The `snmpa_supervisor` must be running.

If the supervisor is not running, the function fails with the reason `badarg`.

# start_sub_sup(Opts)

    -spec start_sub_sup(Opts) -> {ok, Pid} | {error, Reason}
                           when
                               Opts :: [Opt],
                               Opt :: {db_dir, snmp:dir()} | {atom(), term()},
                               Pid :: pid(),
                               Reason :: {already_started, Pid} | term().

Starts a supervisor for the SNMP agent system without a master agent. The supervisor starts all involved SNMP agent processes, but no agent processes. Sub-agents should be started by calling `start_sub_agent/3`.

`db_dir` is mandatory.

See configuration parameters for a description of the options.

# stop_sub_agent(SubAgentPid)

    -spec stop_sub_agent(SubAgentPid) -> ok | no_such_child when SubAgentPid :: pid().

Stops the sub-agent on the node where the function is called. The `snmpa_supervisor` must be running.

If the supervisor is not running, the function fails with the reason `badarg`.