Use of snmp_select_info()

Hi!

I have a program based on a select() loop. I have integrated netsnmp into
this loop.

The original code is:

select(nfds + 1, &rfds, NULL, NULL, &tv);

The new code is:

snmpblock = 0;
memcpy(&snmptv, &tv, sizeof(struct timeval));
snmp_select_info(&nfds, &rfds, &snmptv, &snmpblock);
if (snmpblock == 0)
   memcpy(&tv, &snmptv, sizeof(struct timeval));
select(nfds + 1, &rfds, NULL, NULL, &tv);


First, if I understand correctly the manual page, I should set snmpblock to
0 to let snmp_select_info() consider "snmptv" value. Then, after
snmp_select_info(), I need to check that snmpblock is still 0 to consider
that the new value of snmptv is correct. Otherwise, I should consider it as
NULL (and in my case, I use the previous value instead).

Do I use correctly snmp_select_info()? Am I right to assert that if
snmpblock is still 0 after snmp_select_info, "snmptv" is less or equal to
the value of "tv"?

I ask this question because on some unknown and rare condition, select()
seems to hang.

If you need to look at the real code, here it is:
 http://cgit.luffy.cx/lldpd/tree/src/lldpd.c?id=630b4134e8ca84f205e12d8690182a216254f403#n547


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