Subagent not connecting back to Master Agent.

Hi All,

Recently, I have changed  *agent_check_and_process(1),*
In the SNMP Subagent code to a *select() & snmp_select_info() to handle
outside events*
*, Please find the code snippet attached.*

I have tried to make *fakeblock=0 *too.

Problem I am facing is , If Subagent Process comes up in the system before
the Master Agent(*snmpd*) Process.* Subgent is not able to establish
connection with Master Agent*.But if Master Agent(snmpd) process comes up
before the Subagent process in the system, The connection between master
Agent and Subagent is *successful.*

Moreover once the connection is established  between Master Agent and
SubAgent, If I restart snmpd(Master Agent ) it doesn't connect back to the
Subagent.

Above problem is solved if I use agent_check_process(1) .i.e.The Subagent
keeps on polling until it establishes connection with the master agent.( *This
is default expected behaviour*).

Looks like there is some problem in usage of select() and snmp_select_info()
I am using net-snmp 5.8.

Please help me on this 😞.

*-Himanshu*

/////code start from here
keepRunning_=1;
    int maxFd;
    fd_set fdset;
    struct timeval  timeout = { LONG_MAX, 0 }, *tvp = &timeout;
    int  result;
    int  fakeblock = 0;
    maxFd = 0;

    while (keepRunning_)
    {
        /* if you use select(), see snmp_select_info() in snmp_api(3) */
        /*     --- OR ---  */
       * //agent_check_and_process(1)*; /* 0 == don't block */
        maxFd = *eventPipe_;
        FD_ZERO(&fdset);
        snmp_select_info(&maxFd, &fdset, tvp, &fakeblock);
        FD_SET(*eventPipe_, &fdset);
        maxFd = (std::max(maxFd, *eventPipe_));

        result = select(maxFd+1, &fdset, NULL, NULL, NULL);

        if (result == -1)
        {
            if (errno != EINTR)
            {
                snmp_log_perror("select");
            }
            continue;
        }
        else if (result == 0)
        {
            snmp_timeout();
            continue;
        }
       else {
       if (FD_ISSET(*eventPipe_, &fdset))
            {
              //do something
            }
        if (result > 0)
        {
                /*
                * packets found, process them
                */
                snmp_read(&fdset);
        }
        else
        {
                printf("runSubAgent select returned result %d",result);
        }

}
    }

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