前奏参见如下：
问题解决：
实现：
/** Note: this file originally auto-generated by mib2c using* $*/#include <net-snmp/net-snmp-config.h>#include <net-snmp/net-snmp-includes.h>#include <net-snmp/agent/net-snmp-agent-includes.h>#include "dpiProject.h"#define NNN 30#define STRMAX 200#define COLUMN_MIN 1#define COLUMN_MAX 11struct dpiTaskTable_entry *dpiTaskTable_createEntry(u_long gnTaskId, char *gnTaskName, size_t gnTaskName_len);/** Initializes the dpiProject module */voidinit_dpiProject(void){ /* here we initialize all the tables we’re planning on supporting */ initialize_table_dpiTaskTable();}/** Initialize the dpiTaskTable table by defining its contents and how it’s structured */voidinitialize_table_dpiTaskTable(void){ const oid dpiTaskTable_oid[] = {1,3,6,1,4,1,22222,0,1,0,0}; const size_t dpiTaskTable_oid_len = OID_LENGTH(dpiTaskTable_oid); netsnmp_handler_registration *reg; netsnmp_iterator_info *iinfo; netsnmp_table_registration_info *table_info; DEBUGMSGTL(("dpiProject:init", "initializing table dpiTaskTable\n")); reg = netsnmp_create_handler_registration( "dpiTaskTable", dpiTaskTable_handler, dpiTaskTable_oid, dpiTaskTable_oid_len, HANDLER_CAN_RONLY ); table_info = SNMP_MALLOC_TYPEDEF( netsnmp_table_registration_info ); netsnmp_table_helper_add_indexes(table_info, ASN_UNSIGNED, /* index: gnTaskId */ 0); //定义最大最小列数 table_info->min_column = COLUMN_MIN; table_info->max_column = COLUMN_MAX; iinfo = SNMP_MALLOC_TYPEDEF( netsnmp_iterator_info ); iinfo->get_first_data_point = dpiTaskTable_get_first_data_point; iinfo->get_next_data_point = dpiTaskTable_get_next_data_point; iinfo->table_reginfo = table_info; netsnmp_register_table_iterator( reg, iinfo ); netsnmp_inject_handler_before( reg, netsnmp_get_cache_handler(DPITASKTABLE_TIMEOUT, dpiTaskTable_load, dpiTaskTable_free, dpiTaskTable_oid, dpiTaskTable_oid_len), TABLE_ITERATOR_NAME); /* Initialise the contents of the table here */ //初始化表格 dpiTaskTable_createEntry(1, "dpi agent1", strlen("dpi agent1")); dpiTaskTable_createEntry(2, "dpi agent1", strlen("dpi agent1")); dpiTaskTable_createEntry(3, "dpi agent1", strlen("dpi agent1"));} /* Typical data structure for a row entry *///总共11列struct dpiTaskTable_entry { /* Index values */ //u_long gnTaskId; /* Column values */ u_long gnTaskId; char gnTaskName[NNN]; size_t gnTaskName_len; //char gnTaskState[NNN]; //size_t gnTaskState_len; //u_long gnTaskCpuUsage; //u_long gnTaskMemoryUsed; //char gnTaskStartTime[NNN]; //size_t gnTaskStartTime_len; //char gnTaskUpTime[NNN]; //size_t gnTaskUpTime_len; /* Illustrate using a simple linked list */ int valid; struct dpiTaskTable_entry *next;};struct dpiTaskTable_entry *dpiTaskTable_head;/* create a new row in the (unsorted) table */struct dpiTaskTable_entry *dpiTaskTable_createEntry(u_long gnTaskId, char *gnTaskName, size_t gnTaskName_len){ struct dpiTaskTable_entry *entry; entry = SNMP_MALLOC_TYPEDEF(struct dpiTaskTable_entry); if (!entry) return NULL; entry->gnTaskId = gnTaskId; snmp_log(LOG_ERR,"entry->gnTaskId(%d)\n", entry->gnTaskId); //实现创建表 entry->gnTaskName_len = gnTaskName_len; strncpy(entry->gnTaskName, gnTaskName, gnTaskName_len); entry->next = dpiTaskTable_head; dpiTaskTable_head = entry; return entry;}/* remove a row from the table */voiddpiTaskTable_removeEntry( struct dpiTaskTable_entry *entry ) { struct dpiTaskTable_entry *ptr, *prev; if (!entry) return; /* Nothing to remove */ for ( ptr = dpiTaskTable_head, prev = NULL; ptr != NULL; prev = ptr, ptr = ptr->next ) { if ( ptr == entry ) break; } if ( !ptr ) return; /* Can’t find it */ if ( prev == NULL ) dpiTaskTable_head = ptr->next; else prev->next = ptr->next; SNMP_FREE( entry ); /* XXX – release any other internal resources */}/* Example cache handling – set up linked list from a suitable file */intdpiTaskTable_load( netsnmp_cache *cache, void *vmagic ) { FILE *fp; struct dpiTaskTable_entry *this; char buf[STRMAX]; /* The basic load routine template assumes that the data to be reported is held in a file – with one row of the file for each row of the table. If your data is available via a different API, you should amend this initial block (and the control of the ‘while’ loop) accordingly. ‘XXX’ marks where the template is incomplete and code will definitely need to be added. */ fp = fopen( "/data/for/dpiTaskTable", "r" ); if ( !fp ) { return -1; } while ( fgets( buf, STRMAX, fp )) { this = SNMP_MALLOC_TYPEDEF( struct dpiTaskTable_entry ); /* XXX – Unpick ‘buf’ to extract the individual field values and then populate the ‘this’ data structure with them */ this->next = dpiTaskTable_head; dpiTaskTable_head = this; /* Iterate helper is fine with unordered lists! */ } fclose(fp); return 0; /* OK */}voiddpiTaskTable_free( netsnmp_cache *cache, void *vmagic ) { struct dpiTaskTable_entry *this, *that; for ( this = dpiTaskTable_head; this; this=that ) { that = this->next; SNMP_FREE( this ); /* XXX – release any other internal resources */ } dpiTaskTable_head = NULL;}/* Example iterator hook routines – using ‘get_next’ to do most of the work */netsnmp_variable_list *dpiTaskTable_get_first_data_point(void **my_loop_context, void **my_data_context, netsnmp_variable_list *put_index_data, netsnmp_iterator_info *mydata){ *my_loop_context = dpiTaskTable_head; return dpiTaskTable_get_next_data_point(my_loop_context, my_data_context, put_index_data, mydata );}netsnmp_variable_list *dpiTaskTable_get_next_data_point(void **my_loop_context, void **my_data_context, netsnmp_variable_list *put_index_data, netsnmp_iterator_info *mydata){ struct dpiTaskTable_entry *entry = (struct dpiTaskTable_entry *)*my_loop_context; netsnmp_variable_list *idx = put_index_data; if ( entry ) { snmp_set_var_typed_integer( idx, ASN_UNSIGNED, entry->gnTaskId ); idx = idx->next_variable; *my_data_context = (void *)entry; *my_loop_context = (void *)entry->next; return put_index_data; } else { return NULL; }}/** handles requests for the dpiTaskTable table */intdpiTaskTable_handler( netsnmp_mib_handler *handler, netsnmp_handler_registration *reginfo, netsnmp_agent_request_info *reqinfo, netsnmp_request_info *requests) { netsnmp_request_info *request; netsnmp_table_request_info *table_info; struct dpiTaskTable_entry *table_entry; DEBUGMSGTL(("dpiProject:handler", "Processing request (%d)\n", reqinfo->mode)); switch (reqinfo->mode) { /* * Read-support (also covers GetNext requests) */ case MODE_GET: for (request=requests; request; request=request->next) { table_entry = (struct dpiTaskTable_entry *) netsnmp_extract_iterator_context(request); table_info = netsnmp_extract_table_info( request); switch (table_info->colnum) { case COLUMN_GNTASKID: if ( !table_entry ) { netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHINSTANCE); continue; } snmp_set_var_typed_integer( request->requestvb, ASN_UNSIGNED, table_entry->gnTaskId); break; case COLUMN_GNTASKNAME: if ( !table_entry ) { netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHINSTANCE); continue; } snmp_set_var_typed_value( request->requestvb, ASN_OCTET_STR, table_entry->gnTaskName, table_entry->gnTaskName_len); break;#if 0 case COLUMN_GNTASKSTATE: if ( !table_entry ) { netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHINSTANCE); continue; } snmp_set_var_typed_value( request->requestvb, ASN_OCTET_STR, table_entry->gnTaskState, table_entry->gnTaskState_len); break; case COLUMN_GNTASKCPUUSAGE: if ( !table_entry ) { netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHINSTANCE); continue; } snmp_set_var_typed_integer( request->requestvb, ASN_UNSIGNED, table_entry->gnTaskCpuUsage); break; case COLUMN_GNTASKMEMORYUSED: if ( !table_entry ) { netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHINSTANCE); continue; } snmp_set_var_typed_integer( request->requestvb, ASN_UNSIGNED, table_entry->gnTaskMemoryUsed); break; case COLUMN_GNTASKSTARTTIME: if ( !table_entry ) { netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHINSTANCE); continue; } snmp_set_var_typed_value( request->requestvb, ASN_OCTET_STR, table_entry->gnTaskStartTime, table_entry->gnTaskStartTime_len); break; case COLUMN_GNTASKUPTIME: if ( !table_entry ) { netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHINSTANCE); continue; } snmp_set_var_typed_value( request->requestvb, ASN_OCTET_STR, table_entry->gnTaskUpTime, table_entry->gnTaskUpTime_len); break;#endif default: netsnmp_set_request_error(reqinfo, request, SNMP_NOSUCHOBJECT); break; } } break; } return SNMP_ERR_NOERROR;}
说明：
只知道心痛得滴血，都只为你。
