If this module is compiled into an agent, you should be able to issue snmp commands that look something like (authentication information not shown in these commands):
00001 00022 /* 00023 * start be including the appropriate header files 00024 */ 00025 #include <net-snmp/net-snmp-config.h> 00026 #include <net-snmp/net-snmp-includes.h> 00027 #include <net-snmp/agent/net-snmp-agent-includes.h> 00028 00029 /* 00030 * Then, we declare the variables we want to be accessed 00031 */ 00032 static int example1 = 42; /* default value */ 00033 00034 /* 00035 * our initialization routine, automatically called by the agent 00036 * (to get called, the function name must match init_FILENAME()) 00037 */ 00038 void 00039 init_scalar_int(void) 00040 { 00041 /* 00042 * the OID we want to register our integer at. This should be a 00043 * fully qualified instance. In our case, it's a scalar at: 00044 * NET-SNMP-EXAMPLES-MIB::netSnmpExampleInteger.0 (note the 00045 * trailing 0 which is required for any instantiation of any 00046 * scalar object) 00047 */ 00048 oid my_registration_oid[] = 00049 { 1, 3, 6, 1, 4, 1, 8072, 2, 1, 1, 0 }; 00050 00051 /* 00052 * a debugging statement. Run the agent with -Dexample_scalar_int to see 00053 * the output of this debugging statement. 00054 */ 00055 DEBUGMSGTL(("example_scalar_int", 00056 "Initalizing example scalar int. Default value = %d\n", 00057 example1)); 00058 00059 /* 00060 * the line below registers our "example1" variable above as 00061 * accessible and makes it writable. A read only version of the 00062 * same registration would merely call 00063 * register_read_only_int_instance() instead. 00064 * 00065 * If we wanted a callback when the value was retrieved or set 00066 * (even though the details of doing this are handled for you), 00067 * you could change the NULL pointer below to a valid handler 00068 * function. 00069 */ 00070 netsnmp_register_int_instance("my example int variable", 00071 my_registration_oid, 00072 OID_LENGTH(my_registration_oid), 00073 &example1, NULL); 00074 00075 DEBUGMSGTL(("example_scalar_int", 00076 "Done initalizing example scalar int\n")); 00077 }