io: improve docs for QIOChannelSocket async functions

In the docs for qio_channel_socket_connect_async,
qio_channel_socket_listen_async and
qio_channel_socket_dgram_async, mention that the
SocketAdd

io: improve docs for QIOChannelSocket async functions

In the docs for qio_channel_socket_connect_async,
qio_channel_socket_listen_async and
qio_channel_socket_dgram_async, mention that the
SocketAddress parameters are copied, so can be freed
immediately.

Reviewed-by: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

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Merge remote-tracking branch 'remotes/berrange/tags/pull-io-next-2016-01-20-1' into staging

I/O channels fixes 2016/01/20 v1

# gpg: Signature made Wed 20 Jan 2016 11:31:47 GMT using RSA key ID 1510

Merge remote-tracking branch 'remotes/berrange/tags/pull-io-next-2016-01-20-1' into staging

I/O channels fixes 2016/01/20 v1

# gpg: Signature made Wed 20 Jan 2016 11:31:47 GMT using RSA key ID 15104FDF
# gpg: Good signature from "Daniel P. Berrange <dan@berrange.com>"
# gpg: aka "Daniel P. Berrange <berrange@redhat.com>"

* remotes/berrange/tags/pull-io-next-2016-01-20-1:
io: use memset instead of { 0 } for initializing array
io: fix description of @errp parameter initialization
io: some fixes to handling of /dev/null when running commands
io: increment counter when killing off subcommand
io: fix sign of errno value passed to error report

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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io: fix description of @errp parameter initialization

The "Error **errp" parameters must be NULL initialized
not uninitialized.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

Merge remote-tracking branch 'remotes/berrange/tags/pull-io-channel-base-2015-12-18-1' into staging

Merge I/O channels base classes

# gpg: Signature made Fri 18 Dec 2015 12:18:38 GMT using RSA key

Merge remote-tracking branch 'remotes/berrange/tags/pull-io-channel-base-2015-12-18-1' into staging

Merge I/O channels base classes

# gpg: Signature made Fri 18 Dec 2015 12:18:38 GMT using RSA key ID 15104FDF
# gpg: Good signature from "Daniel P. Berrange <dan@berrange.com>"
# gpg: aka "Daniel P. Berrange <berrange@redhat.com>"

* remotes/berrange/tags/pull-io-channel-base-2015-12-18-1:
io: add QIOChannelBuffer class
io: add QIOChannelCommand class
io: add QIOChannelWebsock class
io: add QIOChannelTLS class
io: add QIOChannelFile class
io: add QIOChannelSocket class
io: add QIOTask class for async operations
io: add helper module for creating watches on FDs
io: add abstract QIOChannel classes

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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io: add QIOChannelSocket class

Implement a QIOChannel subclass that supports sockets I/O.
The implementation is able to manage a single socket file
descriptor, whether a TCP/UNIX listener, TCP/UNIX

io: add QIOChannelSocket class

Implement a QIOChannel subclass that supports sockets I/O.
The implementation is able to manage a single socket file
descriptor, whether a TCP/UNIX listener, TCP/UNIX connection,
or a UDP datagram. It provides APIs which can listen and
connect either asynchronously or synchronously. Since there
is no asynchronous DNS lookup API available, it uses the
QIOTask helper for spawning a background thread to ensure
non-blocking operation.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

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