SNMP Subagent Programmer's Guide

Hello World Program
2-16 119728—SNMP Subagent Programmer’s Guide
Programming Tutorials
Example 2-2. Hello World Source Code (page 1 of 2)
/*************************************************************************
* hello.c - demo hello world program to illustrate how an application
* which uses global data may be made manageable.
************************************************************************/
#include "tdmporth" nolist
<-- 1
#include "machtyph" nolist
#include "syspubh" nolist
#include "smitypeh" nolist
#include "mgmtpubh" nolist
#define DEF_TEXT "Hello World"
#define DEF_FREQUENCY 15
/*
* global attributes that will be referenced by SMI
* compiler generated code. These global variables must be
* defined before the file "hello.h" is included because this
* file will make reference to these variables. These are the names
* that appear in the C_VARIABLE clauses.
*/
static char text[256] = {DEF_TEXT};
static DisplayString helloText = {sizeof(DEF_TEXT)-1, (ubyte *) text};
<-- 2
static INTEGER helloPrintFreq = DEF_FREQUENCY;
static Counter helloPrintCnt = 0;
#pragma nowarn (93)
<-- 3
#include "helloh" /* SMI compiler output */
<-- 4
#pragma warn (93)
static int time_to_die = 0;
<-- 5
/*************************************************************************
* main - hello-world demo main program.
************************************************************************/
int
main(int argc,
<-- 6
char *argv[])
...
{
short dummy = 0;
<-- 7
/*
* handles to the management environment and our group
*/
void *mgmt_env = NULL;
void *mgmt_hello_handle = NULL;
/*
* detect configuration changes
*/
INTEGER last_freq = helloPrintFreq;
/*
* Make sure we were properly invoked
*/
if (argc != 2)
<-- 8
{
(void) fprintf(stderr, "Usage: run %s: $<agent>\n", argv[0]);
return(1);
}
/*
* Set up the management environment. We'll talk to the local
* agent, registering ourselves as 1.3.6.1.4.1.442.2.1
* with no password.
*/