Apparently init --user adopts orphans.  To quote the author
Stewart Smith:

  As much as one can be happy in Ubuntu breaking something that has been
  true for what must be approaching 40 years, yep, I'm happy for you to
  make the changes.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Trivial, but they make coding easier and more predictable.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

MSVC only supports inline assembly and does not support the keyword
volatile for assembly.
Signed-off-by: Ahmed Samy <f.fallen45@gmail.com>

Signed-off-by: Ahmed Samy <f.fallen45@gmail.com>

This is a much more cleaner way to do it and _should_ be easier for people
to use.
Signed-off-by: Ahmed Samy <f.fallen45@gmail.com>

Signed-off-by: Ahmed Samy <f.fallen45@gmail.com>

Useful for getsockname().
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

I really wanted an array of bytes in there, so make it more flexible.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Not a perfect solution (we'd ideally want to go to another plan
immediately, but that would involve a malloc).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Don't call through io_loop, but have it pass the connection back
and call manually.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Don't call from the plan-construction function, call after it returns.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Without this, closing an fd results in a spin...
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Overloading io_close() as a callback is ugly: create an explicit
io_close_cb().
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Use a -1 for error codes.  This makes it easier to write your own io funcs.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Rather than insisting on supplying them on every call to io_new_conn().
Also, this way it can be changed on a connection.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

And rename debug_io_plan() to io_plan_debug() so it can be exposed.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Debugging an async library is a pain: it's nice to force it into a
linear call chain to try to track problems.

Ugly code, though.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

In particular, make sure that idle connections don't get closed.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Have it set the plan itself, rather than passing it back.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Pass fd and plan explicitly, so they don't need to know the definition
of struct io_conn, and return a bool instead of an enum.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Use a NULL next pointer instead to indicate a closing connection.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Use a NULL io pointer instead to indicate an idle connection.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

It was only used for initial connections which hadn't started I/O.  Now
they are initialized with an io_plan, it can be eliminated.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Rather than going via a callback, which tends to just set up I/O, do
any setup before the call to io_new_conn(), then pass it the io_plan
directly.

The patch shows how much this simplifies our test code.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Instead of assuming they want a connection made from the new fd, hand
the fd to a callback.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

No longer needed.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

This simplifies some things: in particular, we can construct an
io_plan without needing the current io_conn.

On the other hand, we need to expose the structure now.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

We only use it in one place: for wakeup.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Ready for exposure.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Explicit callbacks are slower, but more flexible.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Sure, both listener and conn need them, but for different things
(listener uses them simply to set up conn).  Putting them in the
common union was a mistake.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Weaning off enum io_state, to allow custom ones.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>