Re: RFFR

Note that on sparc processors, packed structures are a problem. I
remember a long time ago having a program crashing using pcap or libnet
code (i don't remember which the problem was from). 
the problem lied in a "long" nonaligned to 4 bytes, placed in a
structure, and then deferenced. I believed it to be a compiler problem
(which should detect nonaligned access).

hope this will help
On Thu, 22 Jan 2004 13:18:13 +0100
"Alfredo Andres Omella" <[email protected]> wrote:

> 
> IMHO is very important to fix data structures not aligned in memory.
> 
> On Solaris8 SPARC an Linux RedHat 7.2 (2.4.7-10) "sizeof(struct
> libnet_stp_conf_hdr)" is 40 bytes and must be 35 bytes.
> 
> Fortunately libnet_stp_conf_hdr is not used within the libnet code but
> is susceptible to be used by users (hope nobody do it) :).
> 
> Do you think is really necessary (the structure, i mean)? :?
> 
> If you prefere to keep up with the structure one solution could be to
> use"__attribute__((packed))" but this would face 2 problems:
> a) Any user will be forced to use gcc (some people use the Sun
> compiler, not compatible with "attribute" extensions.)
> b) Packing structures will penalize the libnet performance.
> 
> 
> Waiting for answers...
> 
> 
> Alfredo
> 
> 
> 
>