[OMPI devel] extracting MPI message tag at the btl level

[Karol Mroz]

Good morning everyone. I had a question about obtaining the message tag 
from the iovec array in mca_btl_sctp_frag_t* frag from within the 
mca_btl_tcp_frag_send() function. If I understand correctly, the first X 
bytes in the first iovec entry contain message header information in the 
form of an mca_pml_ob1_match_hdr_t struct that contains a hdr_tag field. 
When I extract this, I get a number that resembles an address. 
Dereferencing this gives, from what I can tell, an incorrect value and 
passing the value into ntohl() etc brings me no closer. There is 
probably something basic I'm overlooking... any help would be appreciated.

Thanks,
Karol
--
Karol Mroz
km...@cs.ubc.ca