Re: Problem on 64 bit machine

On 23/08/06, Sachin Mishra <[email protected]> wrote:
> Thanks Dave. Size of long is 8. Was just curious if I can get the
> portion of the code where the value is assigned.

Ummm...
Probably as follows:   snmplib/snmp_api.c:snmp_pdu_parse():  lines 4429ff:

        switch ((short) vp->type) {
        case ASN_INTEGER:
            vp->val.integer = (long *) vp->buf;
            vp->val_len = sizeof(long);
            asn_parse_int(..., sizeof(*vp->val.integer));
            break;
        case ASN_COUNTER:
        case ASN_GAUGE:
        case ASN_TIMETICKS:
        case ASN_UINTEGER:
            vp->val.integer = (long *) vp->buf;
            vp->val_len = sizeof(u_long);
            asn_parse_unsigned_int(...., vp->val_len);
            break;


Dave



>
> -Sachin
>
> On Wed, 2006-08-23 at 15:19, Dave Shield wrote:
> > On 23/08/06, Sachin Mishra <[email protected]> wrote:
> > >                  When I am trying to set the value of the object on a 64 bit
> > > machine, the "requests" variable passed in the table_handler function
> > > has requests->requestvb->val_len assigned as 8. I want to know why this
> > > value is 8 and not 4. (sizeof(int) gives 4 on that machine)?
> >
> > What does "sizeof(long)" give?  4 or 8?
> > Note that (for historical reasons), integer values are held internally
> > as "long" rather than "int".    This is so pervasive that it would be
> > extremely difficult to change now.
> >
> > I believe that what's been done to address this problem, is to mask
> > off the bottom 32-bits of all integer values (other than Counter64) -
> > probably when building the PDU.   You could either tweak your library
> > code to do the same, or do an equivalent masking when setting the
> > values.  As long as the *value* is 32-bits, it doesn't actually matter
> > if the variable that holds it is 64.
> >
> > Dave
>
>
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