The main idea is to make DatagramChannel and *SocketChannel behave in
a way that more closely matches the standard, e.g. allow binding
sockets to addresses without necessarily listening on those addresses
and accept null addresses where appropriate. It also avoids multiple
redundant DNS lookups.
This commit also implements CharBuffer and BindException, and adds the
Readable interface.
Previously, I used a shell script to extract modification date ranges
from the Git history, but that was complicated and unreliable, so now
every file just gets the same year range in its copyright header. If
someone needs to know when a specific file was modified and by whom,
they can look at the Git history themselves; no need to include it
redundantly in the header.
gethostbyname may return any combination of IPv4 and IPv6 addresses,
and it's not safe to assume the first address is IPv4, which is all
our code is currently prepared to handle. In contrast, getaddrinfo
allows us to specify whether we want IPv4, IPv6, or both.
We should eventually make this switch on Windows as well, but the
status of getaddrinfo in Windows 2000 is not clear, and MinGW's
ws2tcpip.h only declares it for XP and above.
This commit also adds InetAddress.getByName for explicit DNS lookups.
