Hi,
I am working on an application that needs to run on both Windows and
Linux platforms, and in order to do that I use mono (i.e. .Net).
For the snmp-functionality of that application I use net-snmp, since it
comes in both flavors as well. But I run into the following issue, when
using asynch operations:
I must call snmp_select_info and then call select on the returned
fd_set, but this is a strictly posix approach, ergo I cannot call select
from the .net environment.
I wonder why this approach was chosen? It makes more sense to me to
handle the select in net-snmp, since an application doing asynch
operations is not interested in the specific fd's involved, it wants to
be woken up when data has arrived as is done in the snmp_read call.
So I implemented this, and it seems to work fine. I am just wondering if
I am missing some details why this approach is false, and if my
implementation is not violating your architecture, how do we proceed
from here.
Finally my changes:
in snmp_api.c I introduced a new function snmp_asynch_read (of course
this should be implemented differently, for one it should check wether a
callback is provided for this session, and snmp_select_info could be
skipped by getting the data directly from the session):
/*
* Loop over this function untill all data has been
* recieved (-1 is returned).
*
* returns 0 if success, -1 if fail
*/
int
snmp_asynch_read()
{
int rc = 0; //Success
int numfds = 0;
int block = 0;
fd_set fdset;
FD_ZERO(&fdset);
struct timeval timeout;
snmp_select_info(&numfds, &fdset, &timeout, &block);
numfds = select(numfds, &fdset, NULL, NULL, block?NULL:&timeout);
if (numfds > 0)
{
snmp_read(&fdset);
} else {
snmp_timeout();
rc = -1; //'fail'
}
return rc;
}
Kind Regards,
Erik van Veelen
Senior (embedded) software engineer
AimValley B.V.
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