The
ares_fds
function retrieves the set of file descriptors which the calling
application should select on for reading and writing for the
processing of name service queries pending on the name service channel
identified by
channel.
File descriptors will be set in the file descriptor sets pointed to by
read_fds
and
write_fds
as appropriate. File descriptors already set in
read_fds
and
write_fds
will remain set; initialization of the file descriptor sets
(using
FD_ZERO)
is the responsibility of the caller.
RETURN VALUES
ares_fds
returns one greater than the number of the highest socket set in either
read_fds
or
write_fds.
If no queries are active,
ares_fds
will return 0.