while looking at the coverity issue "1222989 Bad bit shift operation" and "1222990 Bad bit shift operation", it has come to light that set_fd(..), and isset_fd(..) function implementation are faulty and on top of that for some unknown reason, these functions are trying to reinvent the wheel by not using the standard API (fd_set) already exists for same purpose. So this commit removes the isset_fd() and set_fd() functions and adopts the more sane choice of using FD_SET and FD_ISSET functions.
while looking at the coverity issue "1222989 Bad bit shift operation" and
"1222990 Bad bit shift operation", it has come to light that set_fd(..),
and isset_fd(..) function implementation are faulty and on top of that
for some unknown reason, these functions are trying to reinvent the wheel
by not using the standard API (fd_set) already exists for same purpose.
So this commit removes the isset_fd() and set_fd() functions and adopts
the more sane choice of using FD_SET and FD_ISSET functions.

treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres