SNMP Subagent Programmer's Guide

Fault-Tolerant Hello World Program
2-30 119728—SNMP Subagent Programmer’s Guide
Programming Tutorials
Example 2-4. Fault-Tolerant Hello World Program (page 1 of 3)
#include "tdmportH" nolist
#include "machtyph" nolist
#include "syspubh" nolist
#include "smitypeh" nolist
#include "mgmtpubh" nolist
#include "mgmtenvH" nolist
#define DEF_TEXT "Hello World"
#define DEF_FREQUENCY 15
static char text[256] = {DEF_TEXT};
static DisplayString helloText = {sizeof(DEF_TEXT)-1, (ubyte *) text};
static INTEGER helloPrintFreq = DEF_FREQUENCY;
static Counter helloPrintCnt = 0;
#pragma nowarn (93)
#include "helloh" nolist /* SMI compiler output */
#pragma warn (93)
#include <talh> nolist
#include <cextdecs (FILE_GETINFO_,AWAITIOX)> nolist
/* agent information includes mgmt_env pointer,
* handle to the management environment and our group, and
* file number (-1 means not connected) */
#define MAXAGTS 5
typedef struct {
<-- 1
struct mgmt_env *mgmt_env;
void *mgmt_handle;
short agent_filenumber;
} agent_info_t;
agent_info_t agent_info[MAXAGTS+1]; /* element 0 is not used */
<-- 2
/************************************************************************* *
* main - fault-tolerant hello-wowrld demo main program.
************************************************************************/
int main(int argc, char *argv[])
{
/** detect configuration changes */
INTEGER last_freq = helloPrintFreq;
/* mgmt_read_nowait stuff */
short count_xferd = 0; /* used for AWAITIO to mgmt_poll() */
short i, /* loop index */
event_fileno, /* returned from AWAITIO */
status, /* CC status from AWAITIO */
error, /* agent-subagent interprocess comm. errors */
living_agent_count; /* know when to quit */
<-- 3
/* initialize agent communication stuff */
for (i=0;i++;i<MAXAGTS) {
agent_info[i].mgmt_env = NULL;
agent_info[i].mgmt_handle = NULL;
agent_info[i].agent_filenumber = -1;
}
/* Make sure we were properly invoked */
if ((argc > MAXAGTS + 1) || (argc <= 1)) {
i = MAXAGTS;
(void) fprintf(stderr, "Usage: run %s $<agent> ... (up to %i agents)\n",
argv[0], i);
return(2);
}