about the resolver API

[srinivasu v v s]

hi all,
My doubt is regarding the DNS resolver API.
If _res_state structure is initialised with proper values in the application 
program and gethostbyname() is called, will it consider the initialised 
values.(when resolv.h is included)

I have tried in versions like 8.1 and 8.2.2. It is showing different 
results like in 8.1 they are not considered and in 8.2.2 they are considered.

Till now i was thinking that only "_res_state.options" field can be set by 
the user (as described in man page of res_init())  and the _res_state 
structure values are used only by the res_search() like APIs. 
But even gethostbyname() API is also responding for the values in some of the 
versions.AM I right? 

Please any one explain or direct me for exact POSIX standard regarding 
the resolver API.
 
thanx in advance,
Srini