I wrote all of most of them, for the others, here's the CCAN mailing
list thread authorizing it:

From: Timothy B. Terriberry <tterribe@xiph.org>
Subject: Re: [ccan] Changing from Public Domain to CC0
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: ccan@ozlabs.org
Date: Wed, 31 Oct 2012 02:53:50 -0400

Rusty Russell <rusty@rustcorp.com.au> wrote:

> I want to change the License string (and add a symlink) to the following
> trivial modules.  Please Ack.

> isaac

Ack.

From: Alessandro Guido <ag@alessandroguido.name>
Subject: Re: Changing from Public Domain to CC0
To: Rusty Russell <rusty@rustcorp.com.au>
Date: Wed, 31 Oct 2012 10:59:53 +0100
Acked-by: Alessandro Guido <ag@alessandroguido.name>

From: Brad Hards <bradh@frogmouth.net>
Subject: Re: Changing from Public Domain to CC0
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: Joey Adams <joeyadams3.14159@gmail.com>, Alessandro Guido <ag@alessandroguido.name>, Andreas Schlick <schlick@lavabit.com>, ccan@ozlabs.org
Date: Wed, 31 Oct 2012 23:43:24 +1100

On 31/10/12 17:43, Rusty Russell wrote:
> Damn lawyers!
>
> Since Public Domain is a slippery concept outside certain countries, it
> has been suggested that I formalize it to Creative Commons Zero.
>
> I want to change the License string (and add a symlink) to the following
> trivial modules.  Please Ack.

Ack.

More generally, anything I've put into CCAN is so trivial that you can
relicense it (to any Free / Open Source license) as part of any
relicensing you can otherwise get agreement to.

Brad

[Sorry if this comes out in HTML - I'm stuck with unsat tools while
travelling].
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Compiler:
/home/rusty/devel/cvs/ccan/ccan/tlist/tlist.h: In function ‘main’:
/home/rusty/devel/cvs/ccan/ccan/tlist/tlist.h:186:15: warning: variable ‘first’ set but not used [-Wunused-but-set-variable]

Compiler:
/home/rusty/devel/cvs/ccan/ccan/tlist/tlist.h: In function ‘main’:
/home/rusty/devel/cvs/ccan/ccan/tlist/tlist.h:205:15: warning: variable ‘last’ set but not used [-Wunused-but-set-variable]
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Compiler:
/home/rusty/devel/cvs/ccan/ccan/time/time.h: In function ‘main’:
/home/rusty/devel/cvs/ccan/ccan/time/time.h:334:16: warning: variable ‘tv’ set but not used [-Wunused-but-set-variable]

Compiler:
/home/rusty/devel/cvs/ccan/ccan/time/time.h: In function ‘main’:
/home/rusty/devel/cvs/ccan/ccan/time/time.h:353:17: warning: variable ‘ts’ set but not used [-Wunused-but-set-variable]
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Compiler:
/home/rusty/devel/cvs/ccan/ccan/talloc/_info: In function ‘main’:
/home/rusty/devel/cvs/ccan/ccan/talloc/_info:84:9: warning: passing argument 2 of ‘open_output_cmd’ discards ‘const’ qualifier from pointer target type [enabled by default]
/home/rusty/devel/cvs/ccan/ccan/talloc/_info:52:24: note: expected ‘char *’ but argument is of type ‘const char *’
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

/home/rusty/devel/cvs/ccan/ccan/list/list.h: In function ‘main’:
/home/rusty/devel/cvs/ccan/ccan/list/list.h:280:15: warning: variable ‘first’ set but not used [-Wunused-but-set-variable]

/home/rusty/devel/cvs/ccan/ccan/list/list.h: In function ‘main’:
/home/rusty/devel/cvs/ccan/ccan/list/list.h:304:15: warning: variable ‘last’ set but not used [-Wunused-but-set-variable]
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

/home/rusty/devel/cvs/ccan/ccan/lbalance/lbalance.c:Compiling object files gave warnings:
/home/rusty/devel/cvs/ccan/ccan/lbalance/lbalance.c: In function ‘best_target’:
/home/rusty/devel/cvs/ccan/ccan/lbalance/lbalance.c:245:18: warning: variable ‘best’ set but not used [-Wunused-but-set-variable]
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

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

/home/rusty/devel/cvs/ccan/ccan/crcsync/test/run-crash.c:==6923== 112 bytes in 1 blocks are definitely lost in loss record 2 of 3
==6923==    at 0x402BA7A: malloc (vg_replace_malloc.c:261)
==6923==    by 0x80492EE: crcblocks (run-crash.c:20)
==6923==    by 0x8049448: main (run-crash.c:62)
==6923== 2,217 (2,212 direct, 5 indirect) bytes in 1 blocks are definitely lost in loss record 3 of 3
==6923==    at 0x402BA7A: malloc (vg_replace_malloc.c:261)
==6923==    by 0x8048AA0: crc_context_new (crcsync.c:85)
==6923==    by 0x8049476: main (run-crash.c:64)

/home/rusty/devel/cvs/ccan/ccan/crcsync/test/run.c:==11793== 512 bytes in 1 blocks are definitely lost in loss record 1 of 2
==11793==    at 0x402A52B: calloc (vg_replace_malloc.c:462)
==11793==    by 0x8049A3F: main (run.c:128)
==11793== 512 bytes in 1 blocks are definitely lost in loss record 2 of 2
==11793==    at 0x402A52B: calloc (vg_replace_malloc.c:462)
==11793==    by 0x8049A57: main (run.c:129)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

/home/rusty/devel/cvs/ccan/ccan/crcsync/test/run-crash.c:Compile gave warnings:
/home/rusty/devel/cvs/ccan/ccan/crcsync/test/run-crash.c: In function ‘main’:
/home/rusty/devel/cvs/ccan/ccan/crcsync/test/run-crash.c:30:3: warning: initialization discards ‘const’ qualifier from pointer target type [enabled by default]
/home/rusty/devel/cvs/ccan/ccan/crcsync/test/run-crash.c:35:3: warning: initialization discards ‘const’ qualifier from pointer target type [enabled by default]
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>

/home/rusty/devel/cvs/ccan/ccan/alignof/test/run.c:32:7: warning: variable ‘c2’ set but not used [-Wunused-but-set-variable]
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Compiler:
/home/rusty/devel/cvs/ccan/ccan/str/str.h: In function ‘main’:
/home/rusty/devel/cvs/ccan/ccan/str/str.h:69:5: warning: variable ‘i’ set but not used [-Wunused-but-set-variable]
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

This means error messages come out in the right place.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Public domain for those who don't have it.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

http://creativecommons.org/publicdomain/zero/1.0/legalcodeSigned-off-by: Rusty Russell <rusty@rustcorp.com.au>

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

Replace the current brute force implementation of
rfc822_next_header_of_name() with one using a hash table to (lazily) index
the header fields by name.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

This patch adds functions to the rfc822 module to retrieve header fields
of a given name.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Currently, calling bytestring_from_string(NULL) will result in a SEGV
within strlen().  This patch makes this construct safe, returning
bytestring_NULL, which seems a less surprising result.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Currently the test infrastructure for constructing example messages then
parsing them assumes that constructed headers never have errors of any
kind.  That's true so far, but it limits the versatility of this test
apparatus.  This patch extends the infrastructure to allow minor errors
(that is things other than a missing colon) to be handled.  The existing
test data is also extended to include cases which use this.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

David Gibson reports a new format, meaning we didn't show the gcov files
with -vv.

This error constant is actually more specific than the name suggests - it
indicates that a header field name contains characters which are not
permitted in a header field name.  Rename the constant to better reflect
this, likewise rename the testcase based around it.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

The run-bad-header.c test in the rfc822 module is actually testing handling
of one specific sort of bad header - a header field which contains no
colon character.  Rename the test and its internal variables to better
reflect this.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

The check_header() test function will be useful to more than one testcase
so this patch moves it into the common helper.c file.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

Add a simple full-blown example program for the rfc822 module.
'headernames' simply dumps the header field name for every header field in
each message file given on the command line to stdout.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

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

Approved by all contributors:
https://lists.ozlabs.org/pipermail/ccan/2012-September/000490.html
https://lists.ozlabs.org/pipermail/ccan/2012-September/000488.html
https://lists.ozlabs.org/pipermail/ccan/2012-September/000489.htmlSigned-off-by: Rusty Russell <rusty@rustcorp.com.au>

And enhance the documentation a little.

Times can be invalid: non-normalized, or negative.  

It's a superset of struct timeval.  It's also a bit trickier, since we
need -lrt on Linux to use clock_gettime(), and also we can't just cram the
time into a u64 for multiply and divide.

If we do have it, and we redefine it, compilation breaks.

In particular, HAVE_CLOCK_GETTIME_IN_LIBRT.

We intuit the dependencies of embedded examples by looking for #include.
But these extra dependencies may require extra libraries, so we need to
add those, too.

If a dependent module needs -l options, we don't notice.  Fix that, now
we have one.

We let the get_deps() caller hand us the compiled _info filename, but what
about recursive dependencies?  These we re-generate every time.

So fix this: hand a generator callback to get_deps(), expose the one
which simply compiles it, and add a ccanlint one which looks up the
manifest to see if we have one already.

Before:
$ ccanlint -vvvv ccan/failtest | grep -c 'Creating.*_info'
31

After:
$ ccanlint -vvvv ccan/failtest | grep -c 'Creating.*_info'
17

This fixes some format string related bugs that show up on 64-bit builds.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>