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<img alt="Erlang logo" src="../../../../doc/erlang-logo.png"><br><small><a href="users_guide.html">User's Guide</a><br><a href="index.html">Reference Manual</a><br><a href="release_notes.html">Release Notes</a><br><a href="../pdf/snmp-4.22.1.pdf">PDF</a><br><a href="../../../../doc/index.html">Top</a></small><p><strong>Simple Network Management Protocol (SNMP)</strong><br><strong>Reference Manual</strong><br><small>Version 4.22.1</small></p>
<br><a href="javascript:openAllFlips()">Expand All</a><br><a href="javascript:closeAllFlips()">Contract All</a><p><small><strong>Table of Contents</strong></small></p>
<ul class="flipMenu">
<li id="no" title="snmp " expanded="false">snmp<ul>
<li><a href="snmp.html">
Top of manual page
</a></li>
<li title="config-0"><a href="snmp.html#config-0">config/0</a></li>
<li title="start-0"><a href="snmp.html#start-0">start/0</a></li>
<li title="start-1"><a href="snmp.html#start-1">start/1</a></li>
<li title="start_agent-0"><a href="snmp.html#start_agent-0">start_agent/0</a></li>
<li title="start_agent-1"><a href="snmp.html#start_agent-1">start_agent/1</a></li>
<li title="start_manager-0"><a href="snmp.html#start_manager-0">start_manager/0</a></li>
<li title="start_manager-1"><a href="snmp.html#start_manager-1">start_manager/1</a></li>
<li title="date_and_time-0"><a href="snmp.html#date_and_time-0">date_and_time/0</a></li>
<li title="date_and_time_to_universal_time_dst-1"><a href="snmp.html#date_and_time_to_universal_time_dst-1">date_and_time_to_universal_time_dst/1</a></li>
<li title="date_and_time_to_string-1"><a href="snmp.html#date_and_time_to_string-1">date_and_time_to_string/1</a></li>
<li title="date_and_time_to_string-2"><a href="snmp.html#date_and_time_to_string-2">date_and_time_to_string/2</a></li>
<li title="date_and_time_to_string2-1"><a href="snmp.html#date_and_time_to_string2-1">date_and_time_to_string2/1</a></li>
<li title="local_time_to_date_and_time_dst-1"><a href="snmp.html#local_time_to_date_and_time_dst-1">local_time_to_date_and_time_dst/1</a></li>
<li title="universal_time_to_date_and_time-1"><a href="snmp.html#universal_time_to_date_and_time-1">universal_time_to_date_and_time/1</a></li>
<li title="validate_date_and_time-1"><a href="snmp.html#validate_date_and_time-1">validate_date_and_time/1</a></li>
<li title="validate_date_and_time-2"><a href="snmp.html#validate_date_and_time-2">validate_date_and_time/2</a></li>
<li title="passwd2localized_key-3"><a href="snmp.html#passwd2localized_key-3">passwd2localized_key/3</a></li>
<li title="octet_string_to_bits-1"><a href="snmp.html#octet_string_to_bits-1">octet_string_to_bits/1</a></li>
<li title="bits_to_octet_string-1"><a href="snmp.html#bits_to_octet_string-1">bits_to_octet_string/1</a></li>
<li title="read_mib-1"><a href="snmp.html#read_mib-1">read_mib/1</a></li>
<li title="log_to_txt-5"><a href="snmp.html#log_to_txt-5">log_to_txt/5</a></li>
<li title="log_to_txt-6"><a href="snmp.html#log_to_txt-6">log_to_txt/6</a></li>
<li title="log_to_txt-7"><a href="snmp.html#log_to_txt-7">log_to_txt/7</a></li>
<li title="log_to_io-4"><a href="snmp.html#log_to_io-4">log_to_io/4</a></li>
<li title="log_to_io-5"><a href="snmp.html#log_to_io-5">log_to_io/5</a></li>
<li title="log_to_io-6"><a href="snmp.html#log_to_io-6">log_to_io/6</a></li>
<li title="change_log_size-2"><a href="snmp.html#change_log_size-2">change_log_size/2</a></li>
<li title="print_version_info-0"><a href="snmp.html#print_version_info-0">print_version_info/0</a></li>
<li title="print_version_info-1"><a href="snmp.html#print_version_info-1">print_version_info/1</a></li>
<li title="versions1-0"><a href="snmp.html#versions1-0">versions1/0</a></li>
<li title="versions2-0"><a href="snmp.html#versions2-0">versions2/0</a></li>
<li title="print_versions-1"><a href="snmp.html#print_versions-1">print_versions/1</a></li>
<li title="print_versions-2"><a href="snmp.html#print_versions-2">print_versions/2</a></li>
<li title="enable_trace-0"><a href="snmp.html#enable_trace-0">enable_trace/0</a></li>
<li title="disable_trace-0"><a href="snmp.html#disable_trace-0">disable_trace/0</a></li>
<li title="set_trace-1"><a href="snmp.html#set_trace-1">set_trace/1</a></li>
<li title="reset_trace-1"><a href="snmp.html#reset_trace-1">reset_trace/1</a></li>
<li title="set_trace-2"><a href="snmp.html#set_trace-2">set_trace/2</a></li>
</ul>
</li>
<li title="snmp (App)"><a href="snmp_app.html">snmp (App)
</a></li>
<li id="no" title="snmpa " expanded="false">snmpa<ul>
<li><a href="snmpa.html">
Top of manual page
</a></li>
<li title="add_agent_caps-2"><a href="snmpa.html#add_agent_caps-2">add_agent_caps/2</a></li>
<li title="del_agent_caps-1"><a href="snmpa.html#del_agent_caps-1">del_agent_caps/1</a></li>
<li title="get_agent_caps-0"><a href="snmpa.html#get_agent_caps-0">get_agent_caps/0</a></li>
<li title="get-2"><a href="snmpa.html#get-2">get/2</a></li>
<li title="get-3"><a href="snmpa.html#get-3">get/3</a></li>
<li title="get_next-2"><a href="snmpa.html#get_next-2">get_next/2</a></li>
<li title="get_next-3"><a href="snmpa.html#get_next-3">get_next/3</a></li>
<li title="backup-1"><a href="snmpa.html#backup-1">backup/1</a></li>
<li title="backup-2"><a href="snmpa.html#backup-2">backup/2</a></li>
<li title="info-0"><a href="snmpa.html#info-0">info/0</a></li>
<li title="info-1"><a href="snmpa.html#info-1">info/1</a></li>
<li title="old_info_format-1"><a href="snmpa.html#old_info_format-1">old_info_format/1</a></li>
<li title="load_mibs-1"><a href="snmpa.html#load_mibs-1">load_mibs/1</a></li>
<li title="load_mibs-2"><a href="snmpa.html#load_mibs-2">load_mibs/2</a></li>
<li title="unload_mibs-1"><a href="snmpa.html#unload_mibs-1">unload_mibs/1</a></li>
<li title="unload_mibs-2"><a href="snmpa.html#unload_mibs-2">unload_mibs/2</a></li>
<li title="which_mibs-0"><a href="snmpa.html#which_mibs-0">which_mibs/0</a></li>
<li title="which_mibs-1"><a href="snmpa.html#which_mibs-1">which_mibs/1</a></li>
<li title="whereis_mib-1"><a href="snmpa.html#whereis_mib-1">whereis_mib/1</a></li>
<li title="whereis_mib-2"><a href="snmpa.html#whereis_mib-2">whereis_mib/2</a></li>
<li title="current_request_id-0"><a href="snmpa.html#current_request_id-0">current_request_id/0</a></li>
<li title="current_context-0"><a href="snmpa.html#current_context-0">current_context/0</a></li>
<li title="current_community-0"><a href="snmpa.html#current_community-0">current_community/0</a></li>
<li title="current_address-0"><a href="snmpa.html#current_address-0">current_address/0</a></li>
<li title="enum_to_int-2"><a href="snmpa.html#enum_to_int-2">enum_to_int/2</a></li>
<li title="enum_to_int-3"><a href="snmpa.html#enum_to_int-3">enum_to_int/3</a></li>
<li title="int_to_enum-2"><a href="snmpa.html#int_to_enum-2">int_to_enum/2</a></li>
<li title="int_to_enum-3"><a href="snmpa.html#int_to_enum-3">int_to_enum/3</a></li>
<li title="name_to_oid-1"><a href="snmpa.html#name_to_oid-1">name_to_oid/1</a></li>
<li title="name_to_oid-2"><a href="snmpa.html#name_to_oid-2">name_to_oid/2</a></li>
<li title="oid_to_name-1"><a href="snmpa.html#oid_to_name-1">oid_to_name/1</a></li>
<li title="oid_to_name-2"><a href="snmpa.html#oid_to_name-2">oid_to_name/2</a></li>
<li title="which_aliasnames-0"><a href="snmpa.html#which_aliasnames-0">which_aliasnames/0</a></li>
<li title="which_tables-0"><a href="snmpa.html#which_tables-0">which_tables/0</a></li>
<li title="which_variables-0"><a href="snmpa.html#which_variables-0">which_variables/0</a></li>
<li title="which_notifications-0"><a href="snmpa.html#which_notifications-0">which_notifications/0</a></li>
<li title="log_to_txt-1"><a href="snmpa.html#log_to_txt-1">log_to_txt/1</a></li>
<li title="log_to_txt-2"><a href="snmpa.html#log_to_txt-2">log_to_txt/2</a></li>
<li title="log_to_txt-3"><a href="snmpa.html#log_to_txt-3">log_to_txt/3</a></li>
<li title="log_to_txt-4"><a href="snmpa.html#log_to_txt-4">log_to_txt/4</a></li>
<li title="log_to_txt-5"><a href="snmpa.html#log_to_txt-5">log_to_txt/5</a></li>
<li title="log_to_txt-6"><a href="snmpa.html#log_to_txt-6">log_to_txt/6</a></li>
<li title="log_to_txt-7"><a href="snmpa.html#log_to_txt-7">log_to_txt/7</a></li>
<li title="log_to_io-1"><a href="snmpa.html#log_to_io-1">log_to_io/1</a></li>
<li title="log_to_io-2"><a href="snmpa.html#log_to_io-2">log_to_io/2</a></li>
<li title="log_to_io-3"><a href="snmpa.html#log_to_io-3">log_to_io/3</a></li>
<li title="log_to_io-4"><a href="snmpa.html#log_to_io-4">log_to_io/4</a></li>
<li title="log_to_io-5"><a href="snmpa.html#log_to_io-5">log_to_io/5</a></li>
<li title="log_to_io-6"><a href="snmpa.html#log_to_io-6">log_to_io/6</a></li>
<li title="change_log_size-1"><a href="snmpa.html#change_log_size-1">change_log_size/1</a></li>
<li title="set_log_type-1"><a href="snmpa.html#set_log_type-1">set_log_type/1</a></li>
<li title="set_log_type-2"><a href="snmpa.html#set_log_type-2">set_log_type/2</a></li>
<li title="mib_of-1"><a href="snmpa.html#mib_of-1">mib_of/1</a></li>
<li title="mib_of-2"><a href="snmpa.html#mib_of-2">mib_of/2</a></li>
<li title="me_of-1"><a href="snmpa.html#me_of-1">me_of/1</a></li>
<li title="me_of-2"><a href="snmpa.html#me_of-2">me_of/2</a></li>
<li title="invalidate_mibs_cache-0"><a href="snmpa.html#invalidate_mibs_cache-0">invalidate_mibs_cache/0</a></li>
<li title="invalidate_mibs_cache-1"><a href="snmpa.html#invalidate_mibs_cache-1">invalidate_mibs_cache/1</a></li>
<li title="enable_mibs_cache-0"><a href="snmpa.html#enable_mibs_cache-0">enable_mibs_cache/0</a></li>
<li title="enable_mibs_cache-1"><a href="snmpa.html#enable_mibs_cache-1">enable_mibs_cache/1</a></li>
<li title="disable_mibs_cache-0"><a href="snmpa.html#disable_mibs_cache-0">disable_mibs_cache/0</a></li>
<li title="disable_mibs_cache-1"><a href="snmpa.html#disable_mibs_cache-1">disable_mibs_cache/1</a></li>
<li title="which_mibs_cache_size-0"><a href="snmpa.html#which_mibs_cache_size-0">which_mibs_cache_size/0</a></li>
<li title="which_mibs_cache_size-1"><a href="snmpa.html#which_mibs_cache_size-1">which_mibs_cache_size/1</a></li>
<li title="gc_mibs_cache-0"><a href="snmpa.html#gc_mibs_cache-0">gc_mibs_cache/0</a></li>
<li title="gc_mibs_cache-1"><a href="snmpa.html#gc_mibs_cache-1">gc_mibs_cache/1</a></li>
<li title="gc_mibs_cache-1"><a href="snmpa.html#gc_mibs_cache-1">gc_mibs_cache/1</a></li>
<li title="gc_mibs_cache-2"><a href="snmpa.html#gc_mibs_cache-2">gc_mibs_cache/2</a></li>
<li title="gc_mibs_cache-2"><a href="snmpa.html#gc_mibs_cache-2">gc_mibs_cache/2</a></li>
<li title="gc_mibs_cache-3"><a href="snmpa.html#gc_mibs_cache-3">gc_mibs_cache/3</a></li>
<li title="enable_mibs_cache_autogc-0"><a href="snmpa.html#enable_mibs_cache_autogc-0">enable_mibs_cache_autogc/0</a></li>
<li title="enable_mibs_cache_autogc-1"><a href="snmpa.html#enable_mibs_cache_autogc-1">enable_mibs_cache_autogc/1</a></li>
<li title="disable_mibs_cache_autogc-0"><a href="snmpa.html#disable_mibs_cache_autogc-0">disable_mibs_cache_autogc/0</a></li>
<li title="disable_mibs_cache_autogc-1"><a href="snmpa.html#disable_mibs_cache_autogc-1">disable_mibs_cache_autogc/1</a></li>
<li title="update_mibs_cache_age-1"><a href="snmpa.html#update_mibs_cache_age-1">update_mibs_cache_age/1</a></li>
<li title="update_mibs_cache_age-2"><a href="snmpa.html#update_mibs_cache_age-2">update_mibs_cache_age/2</a></li>
<li title="update_mibs_cache_gclimit-1"><a href="snmpa.html#update_mibs_cache_gclimit-1">update_mibs_cache_gclimit/1</a></li>
<li title="update_mibs_cache_gclimit-2"><a href="snmpa.html#update_mibs_cache_gclimit-2">update_mibs_cache_gclimit/2</a></li>
<li title="register_notification_filter-3"><a href="snmpa.html#register_notification_filter-3">register_notification_filter/3</a></li>
<li title="register_notification_filter-4"><a href="snmpa.html#register_notification_filter-4">register_notification_filter/4</a></li>
<li title="register_notification_filter-4"><a href="snmpa.html#register_notification_filter-4">register_notification_filter/4</a></li>
<li title="register_notification_filter-5"><a href="snmpa.html#register_notification_filter-5">register_notification_filter/5</a></li>
<li title="unregister_notification_filter-1"><a href="snmpa.html#unregister_notification_filter-1">unregister_notification_filter/1</a></li>
<li title="unregister_notification_filter-2"><a href="snmpa.html#unregister_notification_filter-2">unregister_notification_filter/2</a></li>
<li title="which_notification_filter-0"><a href="snmpa.html#which_notification_filter-0">which_notification_filter/0</a></li>
<li title="which_notification_filter-1"><a href="snmpa.html#which_notification_filter-1">which_notification_filter/1</a></li>
<li title="set_request_limit-1"><a href="snmpa.html#set_request_limit-1">set_request_limit/1</a></li>
<li title="set_request_limit-2"><a href="snmpa.html#set_request_limit-2">set_request_limit/2</a></li>
<li title="register_subagent-3"><a href="snmpa.html#register_subagent-3">register_subagent/3</a></li>
<li title="unregister_subagent-2"><a href="snmpa.html#unregister_subagent-2">unregister_subagent/2</a></li>
<li title="send_notification2-3"><a href="snmpa.html#send_notification2-3">send_notification2/3</a></li>
<li title="send_notification-3"><a href="snmpa.html#send_notification-3">send_notification/3</a></li>
<li title="send_notification-4"><a href="snmpa.html#send_notification-4">send_notification/4</a></li>
<li title="send_notification-5"><a href="snmpa.html#send_notification-5">send_notification/5</a></li>
<li title="send_notification-6"><a href="snmpa.html#send_notification-6">send_notification/6</a></li>
<li title="send_notification-7"><a href="snmpa.html#send_notification-7">send_notification/7</a></li>
<li title="discovery-2"><a href="snmpa.html#discovery-2">discovery/2</a></li>
<li title="discovery-3"><a href="snmpa.html#discovery-3">discovery/3</a></li>
<li title="discovery-3"><a href="snmpa.html#discovery-3">discovery/3</a></li>
<li title="discovery-4"><a href="snmpa.html#discovery-4">discovery/4</a></li>
<li title="discovery-4"><a href="snmpa.html#discovery-4">discovery/4</a></li>
<li title="discovery-5"><a href="snmpa.html#discovery-5">discovery/5</a></li>
<li title="discovery-6"><a href="snmpa.html#discovery-6">discovery/6</a></li>
<li title="convert_config-1"><a href="snmpa.html#convert_config-1">convert_config/1</a></li>
<li title="restart_worker-0"><a href="snmpa.html#restart_worker-0">restart_worker/0</a></li>
<li title="restart_worker-1"><a href="snmpa.html#restart_worker-1">restart_worker/1</a></li>
<li title="restart_set_worker-0"><a href="snmpa.html#restart_set_worker-0">restart_set_worker/0</a></li>
<li title="restart_set_worker-1"><a href="snmpa.html#restart_set_worker-1">restart_set_worker/1</a></li>
<li title="print_mib_info-0"><a href="snmpa.html#print_mib_info-0">print_mib_info/0</a></li>
<li title="print_mib_tables-0"><a href="snmpa.html#print_mib_tables-0">print_mib_tables/0</a></li>
<li title="print_mib_variables-0"><a href="snmpa.html#print_mib_variables-0">print_mib_variables/0</a></li>
<li title="verbosity-2"><a href="snmpa.html#verbosity-2">verbosity/2</a></li>
</ul>
</li>
<li id="no" title="snmpa_conf " expanded="false">snmpa_conf<ul>
<li><a href="snmpa_conf.html">
Top of manual page
</a></li>
<li title="agent_entry-2"><a href="snmpa_conf.html#agent_entry-2">agent_entry/2</a></li>
<li title="write_agent_config-2"><a href="snmpa_conf.html#write_agent_config-2">write_agent_config/2</a></li>
<li title="write_agent_config-3"><a href="snmpa_conf.html#write_agent_config-3">write_agent_config/3</a></li>
<li title="append_agent_config-2"><a href="snmpa_conf.html#append_agent_config-2">append_agent_config/2</a></li>
<li title="read_agent_config-1"><a href="snmpa_conf.html#read_agent_config-1">read_agent_config/1</a></li>
<li title="standard_entry-2"><a href="snmpa_conf.html#standard_entry-2">standard_entry/2</a></li>
<li title="write_standard_config-2"><a href="snmpa_conf.html#write_standard_config-2">write_standard_config/2</a></li>
<li title="write_standard_config-3"><a href="snmpa_conf.html#write_standard_config-3">write_standard_config/3</a></li>
<li title="append_standard_config-2"><a href="snmpa_conf.html#append_standard_config-2">append_standard_config/2</a></li>
<li title="read_standard_config-1"><a href="snmpa_conf.html#read_standard_config-1">read_standard_config/1</a></li>
<li title="context_entry-1"><a href="snmpa_conf.html#context_entry-1">context_entry/1</a></li>
<li title="write_context_config-2"><a href="snmpa_conf.html#write_context_config-2">write_context_config/2</a></li>
<li title="write_context_config-3"><a href="snmpa_conf.html#write_context_config-3">write_context_config/3</a></li>
<li title="append_context_config-2"><a href="snmpa_conf.html#append_context_config-2">append_context_config/2</a></li>
<li title="read_context_config-1"><a href="snmpa_conf.html#read_context_config-1">read_context_config/1</a></li>
<li title="community_entry-1"><a href="snmpa_conf.html#community_entry-1">community_entry/1</a></li>
<li title="community_entry-5"><a href="snmpa_conf.html#community_entry-5">community_entry/5</a></li>
<li title="write_community_config-2"><a href="snmpa_conf.html#write_community_config-2">write_community_config/2</a></li>
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<li title="get_log_type-1"><a href="snmpa_network_interface.html#get_log_type-1">get_log_type/1</a></li>
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<li title="accept_recv-2"><a href="snmpa_network_interface_filter.html#accept_recv-2">accept_recv/2</a></li>
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<li title="accept_recv_pdu-3"><a href="snmpa_network_interface_filter.html#accept_recv_pdu-3">accept_recv_pdu/3</a></li>
<li title="accept_send_pdu-2"><a href="snmpa_network_interface_filter.html#accept_send_pdu-2">accept_send_pdu/2</a></li>
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<li id="no" title="snmpa_notification_delivery_info_receiver " expanded="false">snmpa_notification_delivery_info_receiver<ul>
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<li title="delivery_targets-3"><a href="snmpa_notification_delivery_info_receiver.html#delivery_targets-3">delivery_targets/3</a></li>
<li title="delivery_info-4"><a href="snmpa_notification_delivery_info_receiver.html#delivery_info-4">delivery_info/4</a></li>
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<li title="handle_notification-2"><a href="snmpa_notification_filter.html#handle_notification-2">handle_notification/2</a></li>
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<li id="no" title="snmpa_supervisor " expanded="false">snmpa_supervisor<ul>
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<li id="no" title="snmp_community_mib " expanded="false">snmp_community_mib<ul>
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<li title="configure-1"><a href="snmp_community_mib.html#configure-1">configure/1</a></li>
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<li title="add_community-5"><a href="snmp_community_mib.html#add_community-5">add_community/5</a></li>
<li title="add_community-6"><a href="snmp_community_mib.html#add_community-6">add_community/6</a></li>
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<li id="no" title="snmp_framework_mib " expanded="false">snmp_framework_mib<ul>
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<li title="configure-1"><a href="snmp_framework_mib.html#configure-1">configure/1</a></li>
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<li title="add_context-1"><a href="snmp_framework_mib.html#add_context-1">add_context/1</a></li>
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<li id="loadscrollpos" title="snmp_generic " expanded="true">snmp_generic<ul>
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<li title="get_status_col-2"><a href="snmp_generic.html#get_status_col-2">get_status_col/2</a></li>
<li title="get_status_col-2"><a href="snmp_generic.html#get_status_col-2">get_status_col/2</a></li>
<li title="get_index_types-1"><a href="snmp_generic.html#get_index_types-1">get_index_types/1</a></li>
<li title="get_table_info-2"><a href="snmp_generic.html#get_table_info-2">get_table_info/2</a></li>
<li title="table_func-2"><a href="snmp_generic.html#table_func-2">table_func/2</a></li>
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<li title="table_get_elements-3"><a href="snmp_generic.html#table_get_elements-3">table_get_elements/3</a></li>
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<li title="table_row_exists-2"><a href="snmp_generic.html#table_row_exists-2">table_row_exists/2</a></li>
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<li id="no" title="snmp_index " expanded="false">snmp_index<ul>
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<li title="delete-1"><a href="snmp_index.html#delete-1">delete/1</a></li>
<li title="delete-2"><a href="snmp_index.html#delete-2">delete/2</a></li>
<li title="get-2"><a href="snmp_index.html#get-2">get/2</a></li>
<li title="get_last-1"><a href="snmp_index.html#get_last-1">get_last/1</a></li>
<li title="get_next-2"><a href="snmp_index.html#get_next-2">get_next/2</a></li>
<li title="insert-3"><a href="snmp_index.html#insert-3">insert/3</a></li>
<li title="key_to_oid-2"><a href="snmp_index.html#key_to_oid-2">key_to_oid/2</a></li>
<li title="new-1"><a href="snmp_index.html#new-1">new/1</a></li>
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<li id="no" title="snmp_notification_mib " expanded="false">snmp_notification_mib<ul>
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<li title="configure-1"><a href="snmp_notification_mib.html#configure-1">configure/1</a></li>
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<li title="add_notify-3"><a href="snmp_notification_mib.html#add_notify-3">add_notify/3</a></li>
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<li id="no" title="snmp_pdus " expanded="false">snmp_pdus<ul>
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<li title="dec_message-1"><a href="snmp_pdus.html#dec_message-1">dec_message/1</a></li>
<li title="dec_message_only-1"><a href="snmp_pdus.html#dec_message_only-1">dec_message_only/1</a></li>
<li title="dec_pdu-1"><a href="snmp_pdus.html#dec_pdu-1">dec_pdu/1</a></li>
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<li title="dec_scoped_pdu_data-1"><a href="snmp_pdus.html#dec_scoped_pdu_data-1">dec_scoped_pdu_data/1</a></li>
<li title="dec_usm_security_parameters-1"><a href="snmp_pdus.html#dec_usm_security_parameters-1">dec_usm_security_parameters/1</a></li>
<li title="enc_encrypted_scoped_pdu-1"><a href="snmp_pdus.html#enc_encrypted_scoped_pdu-1">enc_encrypted_scoped_pdu/1</a></li>
<li title="enc_message-1"><a href="snmp_pdus.html#enc_message-1">enc_message/1</a></li>
<li title="enc_message_only-1"><a href="snmp_pdus.html#enc_message_only-1">enc_message_only/1</a></li>
<li title="enc_pdu-1"><a href="snmp_pdus.html#enc_pdu-1">enc_pdu/1</a></li>
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<li id="no" title="snmp_standard_mib " expanded="false">snmp_standard_mib<ul>
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<li title="configure-1"><a href="snmp_standard_mib.html#configure-1">configure/1</a></li>
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<li id="no" title="snmp_target_mib " expanded="false">snmp_target_mib<ul>
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<li title="set_target_engine_id-2"><a href="snmp_target_mib.html#set_target_engine_id-2">set_target_engine_id/2</a></li>
<li title="add_addr-10"><a href="snmp_target_mib.html#add_addr-10">add_addr/10</a></li>
<li title="add_addr-11"><a href="snmp_target_mib.html#add_addr-11">add_addr/11</a></li>
<li title="delete_addr-1"><a href="snmp_target_mib.html#delete_addr-1">delete_addr/1</a></li>
<li title="add_params-5"><a href="snmp_target_mib.html#add_params-5">add_params/5</a></li>
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<li id="no" title="snmp_user_based_sm_mib " expanded="false">snmp_user_based_sm_mib<ul>
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<li title="configure-1"><a href="snmp_user_based_sm_mib.html#configure-1">configure/1</a></li>
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<li title="add_user-13"><a href="snmp_user_based_sm_mib.html#add_user-13">add_user/13</a></li>
<li title="delete_user-1"><a href="snmp_user_based_sm_mib.html#delete_user-1">delete_user/1</a></li>
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</li>
<li id="no" title="snmp_view_based_acm_mib " expanded="false">snmp_view_based_acm_mib<ul>
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<li title="configure-1"><a href="snmp_view_based_acm_mib.html#configure-1">configure/1</a></li>
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<div id="content">
<div class="innertube">
<!-- refpage --><center><h1>snmp_generic</h1></center>
<h3>MODULE</h3>
<div class="REFBODY">snmp_generic</div>
<h3>MODULE SUMMARY</h3>
<div class="REFBODY">Generic Functions for Implementing SNMP Objects in a Database</div>
<h3>DESCRIPTION</h3>
<div class="REFBODY"><p>
<a name="description"></a>
<p>The module <span class="code">snmp_generic</span> contains generic functions for
implementing tables (and variables) using the SNMP built-in database
or Mnesia. These default functions are used if no instrumentation
function is provided for a managed object in a MIB. Sometimes,
it might be necessary to customize the behaviour of the default
functions. For example, in some situations a trap should be sent
if a row is deleted or modified, or some hardware is to be informed,
when information is changed. </p>
<p>The overall structure is shown in the following figure:</p>
<div class="example"><pre>
+---------------+
| SNMP Agent |
+- - - - - - - -+
| MIB |
+---------------+
|
Association file (associates a MIB object with
| snmp_generic:table_funct
| snmp_generic:variable_func)
+--------------------------------------+
| snmp_generic | Support for get-next,
| | RowStatus operations
+----------------------+---------------+
| snmpa_local_db | Mnesia | Database
+--------------+-------+---------------+
| dets | ets |
| (persistent) | |
+--------------+-------+ </pre></div>
<p>Each function takes the argument <span class="code">NameDb</span>, which is a
tuple <span class="code">{Name, Db}</span>, to identify which database the
functions should use. <span class="code">Name</span> is the symbolic name of the
managed object as defined in the MIB, and <span class="code">Db</span> is either
<span class="code">volatile</span>, <span class="code">persistent</span>, or <span class="code">mnesia</span>. If it is
<span class="code">mnesia</span>, all variables are stored in the Mnesia table
<span class="code">snmp_variables</span> which must be a table with two attributes
(not a Mnesia SNMP table). The SNMP tables are stored in Mnesia
tables with the same names as the SNMP tables. All functions
assume that a Mnesia table exists with the correct name and
attributes. It is the programmer's responsibility to ensure
this. Specifically, if variables are stored in Mnesia, the table
<span class="code">snmp_variables</span> must be created by the programmer. The
record definition for this table is defined in the file
<span class="code">snmp/include/snmp_types.hrl</span>.
</p>
<p>If an instrumentation function in the association file for a
variable <span class="code">myVar</span> does not have a name when compiling an
MIB, the compiler generates an entry.
</p>
<div class="example"><pre>
{myVar, {snmp_generic, variable_func, [{myVar, Db]}}.
</pre></div>
<p>And for a table:</p>
<div class="example"><pre>
{myTable, {snmp_generic, table_func, [{myTable, Db]}}.
</pre></div>
</p></div>
<h3><a name="id116039">DATA TYPES</a></h3>
<div class="REFBODY">
<a name="data_types"></a>
<p>In the functions defined below, the following types are used:</p>
<div class="example"><pre>
name_db() = {name(), db()}
name() = atom()
db() = volatile | persistent | mnesia
row_index() = [int()]
columns() = [column()] | [{column(), value()}]
column() = int()
value() = term()
</pre></div>
<dl>
<dt><strong><span class="code">row_index()</span></strong></dt>
<dd>
<p>Denotes the last part of the OID which specifies the
index of the row in the table (see RFC1212, 4.1.6 for
more information about INDEX). </p>
</dd>
<dt><strong><span class="code">columns()</span></strong></dt>
<dd>
<p>Is a list of column numbers in the case of a <span class="code">get</span>
operation, and a list of column numbers and values in the
case of a <span class="code">set</span> operation. </p>
</dd>
</dl>
<a name="get_status_col2"></a>
</div>
<h3>EXPORTS</h3>
<p><a name="get_status_col-2"><span class="bold_code">get_status_col(Name, Cols)</span></a><br><a name="get_status_col-2"><span class="bold_code">get_status_col(NameDb, Cols) -> {ok, StatusVal} | false</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Name = name()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">NameDb = name_db()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Cols = columns()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">StatusVal = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Gets the value of the status column from <span class="code">Cols</span>.
</p>
<p>This function can be used in instrumentation functions for
<span class="code">is_set_ok</span>, <span class="code">undo</span> or <span class="code">set</span> to check if the
status column of a table is modified.</p>
<a name="get_index_types"></a>
</p></div>
<p><a name="get_index_types-1"><span class="bold_code">get_index_types(Name)</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Name = name()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Gets the index types of <span class="code">Name</span></p>
<p>This function can be used in instrumentation functions to
retrieve the index types part of the table info.</p>
<a name="get_table_info"></a>
</p></div>
<p><a name="get_table_info-2"><span class="bold_code">get_table_info(Name, Item) -> table_info_result()</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Name = name()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Item = table_item() | all</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">table_item() = nbr_of_cols | defvals | status_col | not_accessible |
index_types | first_accessible | first_own_index</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">table_info_result() = Value | [{table_item(), Value}]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Value = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Get a specific table info item or, if <span class="code">Item</span> has the
value <span class="code">all</span>, a two tuple list (property list) is instead
returned with all the items and their respctive values of the
given table. </p>
<p>This function can be used in instrumentation functions to
retrieve a given part of the table info.</p>
<a name="table_func"></a>
</p></div>
<p><a name="table_func-2"><span class="bold_code">table_func(Op1, NameDb)</span></a><br><a name="table_func-4"><span class="bold_code">table_func(Op2, RowIndex, Cols, NameDb) -> Ret</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Op1 = new | delete </span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Op2 = get | next | is_set_ok | set | undo</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">NameDb = name_db()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">RowIndex = row_index()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Cols = columns()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Ret = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>This is the default instrumentation function for tables.
</p>
<ul>
<li>The <span class="code">new</span> function creates the table if it does
not exist, but only if the database is the SNMP internal db.</li>
<li>The <span class="code">delete</span> function does not delete the table
from the database since unloading an MIB does not
necessarily mean that the table should be destroyed.</li>
<li>The <span class="code">is_set_ok</span> function checks that a row which
is to be modified or deleted exists, and that a row which
is to be created does not exist.</li>
<li>The <span class="code">undo</span> function does nothing.</li>
<li>The <span class="code">set</span> function checks if it has enough
information to make the row change its status from
<span class="code">notReady</span> to <span class="code">notInService</span> (when a row has
been been set to <span class="code">createAndWait</span>). If a row is set to
<span class="code">createAndWait</span>, columns without a value are set to
<span class="code">noinit</span>. If Mnesia is used, the set functionality is
handled within a transaction.</li>
</ul>
<p>If it is possible for a manager to create or delete rows in
the table, there must be a <span class="code">RowStatus</span> column for
<span class="code">is_set_ok</span>, <span class="code">set</span> and <span class="code">undo</span> to work properly.
</p>
<p>The function returns according to the specification of an
instrumentation function.
</p>
<a name="table_get_elements"></a>
</p></div>
<p><a name="table_get_elements-3"><span class="bold_code">table_get_elements(NameDb, RowIndex, Cols) -> Values</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">NameDb = name_db()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">RowIndex = row_index()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Cols = columns()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Values = [value() | noinit]</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Returns a list with values for all columns in <span class="code">Cols</span>.
If a column is undefined, its value is <span class="code">noinit</span>.</p>
<a name="table_next"></a>
</p></div>
<p><a name="table_next-2"><span class="bold_code">table_next(NameDb, RestOid) -> RowIndex | endOfTable</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">NameDb = name_db()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">RestOid = [int()]</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">RowIndex = row_index()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Finds the indices of the next row in the table. <span class="code">RestOid</span>
does not have to specify an existing row.</p>
<a name="table_row_exists"></a>
</p></div>
<p><a name="table_row_exists-2"><span class="bold_code">table_row_exists(NameDb, RowIndex) -> bool()</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">NameDb = name_db()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">RowIndex = row_index()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Checks if a row in a table exists.</p>
<a name="table_set_elements"></a>
</p></div>
<p><a name="table_set_elements-3"><span class="bold_code">table_set_elements(NameDb, RowIndex, Cols) -> bool()</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">NameDb = name_db()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">RowIndex = row_index()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Cols = columns()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Sets the elements in <span class="code">Cols</span> to the row specified by
<span class="code">RowIndex</span>. No checks are performed on the new values.
</p>
<p>If the Mnesia database is used, this function calls
<span class="code">mnesia:write</span> to store the values. This means that
this function must be called from within a transaction
(<span class="code">mnesia:transaction/1</span> or <span class="code">mnesia:dirty/1</span>).</p>
<a name="variable_func"></a>
</p></div>
<p><a name="variable_func-2"><span class="bold_code">variable_func(Op1, NameDb)</span></a><br><a name="variable_func-3"><span class="bold_code">variable_func(Op2, Val, NameDb) -> Ret</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">Op1 = new | delete | get</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Op2 = is_set_ok | set | undo</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">NameDb = name_db()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Val = value()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Ret = term()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>This is the default instrumentation function for variables.</p>
<p>The <span class="code">new</span> function creates a new variable in the
database with a default value as defined in the MIB, or a zero
value (depending on the type). </p>
<p>The <span class="code">delete</span> function does not delete the variable from
the database. </p>
<p>The function returns according to the specification of an
instrumentation function. </p>
<a name="variable_get"></a>
</p></div>
<p><a name="variable_get-1"><span class="bold_code">variable_get(NameDb) -> {value, Value} | undefined</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">NameDb = name_db()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">Value = value()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Gets the value of a variable.</p>
<a name="variable_set"></a>
</p></div>
<p><a name="variable_set-2"><span class="bold_code">variable_set(NameDb, NewVal) -> true | false</span></a><br></p>
<div class="REFBODY">
<p>Types:</p>
<div class="REFTYPES">
<span class="bold_code">NameDb = name_db()</span><br>
</div>
<div class="REFTYPES">
<span class="bold_code">NewVal = value()</span><br>
</div>
</div>
<div class="REFBODY"><p>
<p>Sets a new value to a variable. The variable is created if
it does not exist. No checks are made on the type of the
new value. </p>
<p>Returns <span class="code">false</span> if the <span class="code">NameDb</span> argument
is incorrectly specified, otherwise <span class="code">true</span>.</p>
</p></div>
<h3><a name="id116771">Example</a></h3>
<div class="REFBODY">
<a name="example"></a>
<p>The following example shows an implementation of a table which is
stored in Mnesia, but with some checks performed at set-request
operations.
</p>
<div class="example"><pre>
myTable_func(new, NameDb) -> % pass unchanged
snmp_generic:table_func(new, NameDb).
myTable_func(delete, NameDb) -> % pass unchanged
snmp_generic:table_func(delete, NameDb).
%% change row
myTable_func(is_set_ok, RowIndex, Cols, NameDb) ->
case snmp_generic:table_func(is_set_ok, RowIndex,
Cols, NameDb) of
{noError, 0} ->
myApplication:is_set_ok(RowIndex, Cols);
Err ->
Err
end;
myTable_func(set, RowIndex, Cols, NameDb) ->
case snmp_generic:table_func(set, RowIndex, Cols,
NameDb),
{noError, 0} ->
% Now the row is updated, tell the application
myApplication:update(RowIndex, Cols);
Err ->
Err
end;
myTable_func(Op, RowIndex, Cols, NameDb) -> % pass unchanged
snmp_generic:table_func(Op, RowIndex, Cols, NameDb).
</pre></div>
<p>The <span class="code">.funcs</span> file would look like:
</p>
<div class="example"><pre>
{myTable, {myModule, myTable_func, [{myTable, mnesia}]}}.
</pre></div>
</div>
</div>
<div class="footer">
<hr>
<p>Copyright © 1997-2012 Ericsson AB. All Rights Reserved.</p>
</div>
</div>
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