LibUV event will use the best available polling method on a system, kind
of like aria2 does already with the different *EventPoll
implementations.
However, libuv may support different/newer polling mechanisms; for
example on Windows it will use IO Completion Ports which are superior to
select() ;)
Make it clear that TLS_WANT_READ must be returned if underlying
SSL/TLS lib does not indicate I/O direction. This is because
SocketCore sets wantRead_ = true when TLS_WANT_READ is returned and
otherwise sets wantWrite_ = true. We only want to set wantWrite_ =
true iff we have some pending data to send.
This is because on some platforms (gnutls on cygwin for example),
library always fails for this function and getting ERROR every time
aria2c invoked is too hard.
The IPv6 asynchronous name resolver is enabled if the host has at
least one interface with IPv6 address configured (the loopback address
will not be counted), which is roughly the same behaviour of the
standard getaddrinfo(3). To disable IPv6 asynchronous name resolver,
use --disable-ipv6.
Now dedicated ConnectCommand handles connection establishment. It
checks whether connection is established or not. It also handles
backup connection. The next Command creation is abstracted using
ControlChain struct template.
Issue A record query only when non-loopback IPv4 address is
configured. Likewise, issue AAA record query only when non-loopback
and non-linklocak IPv6 address is configured.
Since the change b782a56b, we use endOffsetOverride_ as the return
value of getEndByte(). But aria2 does not send Range header field when
range starts 0 (this is because some server returns error if it
received Range: 0-), and the HttpRequest::isRangeSatisfied() checks
the equality of getEndByte() and the end byte in response header and
fails. The fix is send Range header if getEndByte() is set.