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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