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

SEEK_SET == 0, so it's not hurting anyone now, but when I cut & paste
it elsewhere...
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

This is usually what you want; I didn't even add a flag to stop it.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

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

Discovered on bionic's Travis install, it failed at *runtime* when
it couldn't find the shared library.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

The bitmap_word type is an unsigned long.  However in some places we assign
it using -1ULL, a 64-bit value on many platforms.  We sometimes get away
with this because it masks correctly, but in other cases it breaks things.

To clean this up define a new BITMAP_WORD_1 constant, indicating a
bitmap_word with all bits set, and use that instead of explicit UL or ULL
qualifiers.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

I copied them from the kernel, but obviously didn't find good test
vectors.  In particular, the CRC of all zeroes is not 0!
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Note: the previous code in ccan/crc is wrong, so I started fresh with
actual test vectors.
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>

And fix escaping to work with addstr(), and assert in debug mode
if they don't specify quotes.
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>

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

Final results of tools/speed/10000000 (10 runs) shows a slight
slowdown in some tests, but it makes an empty htable smaller.

-Initial delete all: 96-98(96.4+/-0.66) ns
+Initial delete all: 97-99(98.2+/-0.75) ns
-Initial re-inserting: 117-124(121.4+/-1.9) ns
+Initial re-inserting: 124-131(126.4+/-2.4) ns
-Adding (a different) half: 49-50(49.3+/-0.46) ns
+Adding (a different) half: 50-52(51.2+/-0.75) ns
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>

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

Free the internal "always" array like we free "fds".
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Suggested-by: Lisa Neigut <@niftynei>
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>

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

malloc and free aren't for everyone.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

There are cases where we want to suppress all activity except for a
single fd; we already have ugly io_flush_sync, but this is more
useful and more general.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

We could just make them -1, since we don't rely on the values.
But simple negation doesn't make 0 invalid.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Duplex io_conns can be in the always list twice, and it was a source
of bugs, but I didn't want to add a second list_node.  Since there are
not many always at once, it's better (and more space-efficient) to use
a simple pointer array.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

io_conn contains two plans: by knowing what plan this is, it can be cast
back into the io_conn.  That helps for the next patch.

We also remove the strange logic where io_duplex() would return a
magic, invalid io_plan pointer.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

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

This was reported and fixed by @m-schmoock for stderr, but I decided to
rework to make it clearer and cover the other cases:

	https://github.com/ElementsProject/lightning/pull/2321/commits/67dad01549f876e5e620eeffe2f1e78c35bd0f03Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

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

take() applies to the literal pointer value, so tal_free() means it may
randomly apply to a future allocation.  Similarly, tal_resize() should
preserve it.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

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

Hello.

I've decided to take a look at c-lighting code, because we might
consider using it in the future.

I found a small problem in ccan/take/take.c that only concerns code
that runs with CCAN_TAKE_DEBUG set (DEVELOPER=1 for c-lighting).

It is a small issue, but I decided to notify you as the author of the
code, anyway.

the issue is:
  in take_() function, potential failure of realloc for labelarr is not
  handled.

I attached a diff with a fix.

I thought that making a pull request for c-lighting would not be right,
as ccan is a separate project, but I did not find a way to report this
at http://git.ozlabs.org/, where ccan repo resides.

Therefore I wrote to you directly.

[ Minor whitespace changes --RR ]

If we have plugins, and those can register args, we have a problem finding
the plugin dir!  So, do a best-effort incomplete parse.

Note that this can screw up in theory if we have "--unknown --foo" since we
don't know if unknown takes an argument (in which case, ignore --foo) or
not.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

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

It's used inside io_finish; setting to 0 allows that to know we hit
EOF on a read.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Trying to debug what looked like an htable fail in my own code (but seems
it's not), I added htable_check a-la list_check et al.

This means we now depend on ccan/str (for stringify), which breaks the
_info example which also defined streq, and played nasty with const pointers.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

We should use rbuf primitives not reach inside to membuf.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>