Hello,
I've run into a strange problem where a huge number of messages from
snmplib are managing to fill up a 60GB hard drive within about three
hours. The messages are all "Use snmp_sess_select_info2() for processing
large file descriptors", sometimes repeated over a hundred times per
line. I'm still working with the customer to figure out how to reproduce
this, but I thought I'd ask here in case it was an old issue or, at
least, seen by somebody else in some fashion.
Here's the basic system info: 8.1-RELEASE-p2 FreeBSD i386. The NET-SNMP
version is 5.5.
Below is a simplified snippet of the key parts of my code. The code
first makes a list of tasks with initialized, but not open, sessions.
Elsewhere, each task, up to a small limit (64 in this case), is forked
and the children open the SNMP session sockets with snmp_open(), and so
on. I've scoured each of set(), get(), and getnext(), and am sure that
they all call snmp_close() appropriately — there aren't any early
returns or other jumps over those calls — so I don't think that I'm
explicitly leaking any sockets, but descriptors must be hanging around
for some reason. Does this ring any bells for anybody?
for(…){
…
snmp_sess_init(&task->sess_info);
addtask(taskList, task);
…
}
…
for(task = taskList; task && nkids < maxkids; task = task->next){
if(fork() == 0){
set(task);
get(task);
getnext(task);
…
}
nkids++;
}
void set(Task *task){
…
sess = snmp_open(&task->sess_info);
…
pdu = snmp_pdu_create(SNMP_MSG_SET);
…
status = snmp_synch_response(sess, pdu, &resp);
// check return, retr
snmp_close(sess);
}
void get(Task *task){
…
sess = snmp_open(sess_info);
…
pdu = snmp_pdu_create(SNMP_MSG_GET);
…
status = snmp_synch_response(sess, pdu, &resp);
// check return, read variables
snmp_close(sess);
}
void getnext(Task *task){
…
sess = snmp_open(sess_info);
for(obj = task->objs; obj; obj = obj->next){
…
pdu = snmp_pdu_create(SNMP_MSG_GET);
…
status = snmp_synch_response(sess, pdu, &resp);
// check return, read variables
}
snmp_close(sess);
}
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