I have a problem controlling notificaton/traps generation. I used
net-snmp example
notification.c and I am getting this odd behavior. I use
snmp_alarm_register()
to execute my function check_send_trap() every 5sec. check_send_trap()
monitors variable trapFlag
to decide whether to generate a trap. trapFlag is set by an api function
when I want to
send a trap. When I change the value of TrapFlag from the api,
check_send_trap()
apparently does not see the value of TrapFlag change ??? If I set
TrapFlag initially
the trap is sent every 5s continually. If I clear TrapFlag initially no
traps get sent.
I can see TrapFlag change when I call my api function, but
check_send_trap() never
sees the value of TrapFlag change, and this is the same variable!!!
I tried referencing TrapFlag directly in check_send_trap(),also tried
using
the callback data in the snmp_alarm_register() call to save a pointer to
TrapFlag. Neither
approach works, its like check_send_trap() is looking at a different
variable???.
Can you help me as I have spent 2 days trying to figure out what I am
doing wrong?
I have everything else (get, set,etc.) working and I thought traps would
easy!!
I am running Net-snmp v5.1.1 on montavista linux.
This is my code in case you can spot anything I am doing wrong:
1. INIT notification function called by net-snmp:-
void init_notification(void)
{
DEBUGMSGTL(("example_notification",
"initializing (setting callback alarm)\n"));
init_snmp_alarmtraps();
}
2. SETUP ALARM TO SEND TRAP EVERY 5s:
void init_snmp_alarmtraps(void)
{
// run check_send_trap() every 5 seconds
snmp_alarm_register(5, /* seconds */
SA_REPEAT, /* repeat (every 5 seconds).
*/
check_send_trap,
&trapFlag /* callback data needed */
// NULL /* no callback data needed */
);
}
3. CALLBACK FUNCTION check_send_trap:-
void check_send_trap(unsigned int clientreg, void *clientarg)
{
//decide to send a trap based on value of TrapFlag
int sendTrap;
//Get TrapFlag value from clientarg - also tried referencing
TrapFlag directly
sendTrap=*(int*)clientarg;
printf("\ncheck_send_trap, sendTrap=%d\n",sendTrap);fflush(stdout);
if (sendTrap)
{
send_alarmTrap_trap(clientreg,clientarg);
}
}
Note: send_alarmTrap_trap() code from notification.c net-snmp example,
works OK
Thanks in advance,
Clive
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