Fixes #1907.

R=rsc
CC=golang-dev
https://golang.org/cl/4527096

It gets annoying to do this in caller code otherwise,
especially having to remember to Close one side.

R=rsc
CC=golang-dev
https://golang.org/cl/4517134

The LDREXD and STREXD instructions require
aligned addresses, and the ARM stack is not
guaranteed to be aligned during the check.
This may cause other problems later (on the ARM
not all 64-bit pointers may be 64-bit aligned)
but at least the check is correct now.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/4564053

R=rsc
CC=golang-dev
https://golang.org/cl/4550111

R=rsc
CC=golang-dev
https://golang.org/cl/4528116

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/4517132

R=rsc
CC=golang-dev
https://golang.org/cl/4529100

Add IPv6Mreq and Inet6Pktinfo for specifying the network interface.
Rename IpMreq to IPMreq, SetsockoptIpMreq to SetsockoptIPMreq.

R=rsc, dave, robert.hencke
CC=golang-dev
https://golang.org/cl/4532098

Fixes #1792.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/4548083

Programs expect that Read and Write are synchronous.
The background goroutines make the implementation
a little easier, but they introduce asynchrony that
trips up calling code.  Remove them.

R=golang-dev, krasin
CC=golang-dev
https://golang.org/cl/4548079

R=r
CC=golang-dev
https://golang.org/cl/4515179

Fixes #1883.
Fixes #1702.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4532103

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/4539100

Fixes #1840.

R=rsc
CC=golang-dev
https://golang.org/cl/4548077

R=bradfitz, rsc
CC=golang-dev
https://golang.org/cl/4524087

This changes the internal implementation of Cond so that
it uses two generations of waiters.  This enables Signal
to guarantee that it will only wake up waiters that are
currently sleeping at the call time.

Fixes #1648.

R=dvyukov, gustavo, rsc
CC=golang-dev
https://golang.org/cl/4524083

- tested with GOARCH=386
- tested with GOARCH=amd64

R=iant
CC=golang-dev
https://golang.org/cl/4526100

This removes exec.Run and replaces exec.Cmd with a
new implementation. The new exec.Cmd represents
both a currently-running command and also a command
being prepared. It has a good zero value.

You can Start + Wait on a Cmd, or simply Run it.
Start (and Run) deal with copying stdout, stdin,
and stderr between the Cmd's io.Readers and
io.Writers.

There are convenience methods to capture a command's
stdout and/or stderr.

R=r, n13m3y3r, rsc, gustavo, alex.brainman, dsymonds, r, adg, duzy.chan, mike.rosset, kevlar
CC=golang-dev
https://golang.org/cl/4552052

On a 32bit machine, the big.Words are only 32bit.

R=rsc
CC=golang-dev
https://golang.org/cl/4561055

R=rsc
CC=golang-dev
https://golang.org/cl/4559058

- better number scanning algorithm
- fixed a couple of bugs related to base interpretation
- added scan benchmark
- added more test cases and made tests more precise
- introduced Int.scan method matching nat.scan
- refactored Int.Scan; now uses int.scan
- refactored Int.SetString; now uses int.scan

There is more potential, this was a fairly simple change.

gotest -test.bench="ScanPi" before/after (best of 3 runs):
big.BenchmarkScanPi	   1000	    2024900 ns/op
big.BenchmarkScanPi       10000      257540 ns/op

R=chickencha
CC=golang-dev, rsc
https://golang.org/cl/4527089

Using the getaddrinfo order is only okay if we
are smart enough to try multiple addresses in Dial.
Since the code does not do that, we must make
the right first choice, regardless of what getaddrinfo
does, and more often that not that means using the
IPv4 address, even on IPv6 systems.  With the CL
applied, gotest fails in package net on OS X.

helix.cam=; gotest
...
--- FAIL: net.TestDialGoogleIPv4 (1.05 seconds)
        -- 74.125.226.179:80 --
        -- www.google.com:80 --
        Dial("tcp", "", "www.google.com:80") = _, dial tcp [2001:4860:800f::69]:80: address family not supported by protocol family
        -- 74.125.226.179:http --
        -- www.google.com:http --
        Dial("tcp", "", "www.google.com:http") = _, dial tcp [2001:4860:800f::69]:80: address family not supported by protocol family
        -- 074.125.226.179:0080 --
        -- [::ffff:74.125.226.179]:80 --
        -- [::ffff:4a7d:e2b3]:80 --
        -- [0:0:0:0:0000:ffff:74.125.226.179]:80 --
        -- [0:0:0:0:000000:ffff:74.125.226.179]:80 --
        -- [0:0:0:0:0:ffff::74.125.226.179]:80 --
FAIL
gotest: "./6.out" failed: exit status 1

««« original CL description
net: name-based destination address selection

getaddrinfo() orders the addresses according to RFC 3484.

This means when IPv6 is working on a host we get results like:
    []string = {"2001:4810::110", "66.117.47.214"}

and when it's not working we get:
    []string = {"66.117.47.214", "2001:4810::110"}

thus can drop firstFavoriteAddr.

This also means /etc/gai.conf works on relevant systems.

R=rsc, mikioh.mikioh
CC=golang-dev
https://golang.org/cl/4557058

»»»

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/4532101

This mostly adds the infrastructure for writing various forms of
packets as well as reading them. Adding symmetric encryption support
was simply an easy motivation.

There's also one brown-paper-bag fix in here. Previously I had the
conditional for the MDC hash check backwards: the code was checking
that the hash was *incorrect*. This was neatly counteracted by another
bug: it was hashing the ciphertext of the OCFB prefix, not the
plaintext.

R=bradfitz
CC=golang-dev
https://golang.org/cl/4564046

This fixes creation of X509 certificates with
RSA keys. (Broken by e5ecc416f2fd)

R=agl
CC=golang-dev
https://golang.org/cl/4553052

before: runtime_test.BenchmarkCallClosure1       20000000              135 ns/op
after:  runtime_test.BenchmarkCallClosure1      500000000                6 ns/op

R=rsc
CC=golang-dev
https://golang.org/cl/4527091

also make the error prints better in the test.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4556069

Basic parsing, plus date parsing.

R=bradfitz, gary.burd, bsiegert, rsc
CC=golang-dev
https://golang.org/cl/4530079

Make plan 9 Readdir & Readdirnames return os.EOF at end.
Also fix typos in the unix and windows comments.

R=golang-dev, fshahriar, bradfitz, rsc, r
CC=golang-dev
https://golang.org/cl/4557053

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/4527090

R=golang-dev
CC=golang-dev
https://golang.org/cl/4539099

goinstall: more verbose logging with -v

Fixes #1901.

R=rsc, n13m3y3r
CC=golang-dev
https://golang.org/cl/4524078

values >= 16 bits, so the lookup code can be smaller in the
common case.
Also make CaseRange uint32s rather than ints, so if we go to
64-bit ints we don't waste more space.

R=rsc
CC=golang-dev
https://golang.org/cl/4550094

R=bradfitz
CC=golang-dev
https://golang.org/cl/4529102

flate's reader greedily reads from the shared io.Reader in Framer. This leads to a data race on Framer.r. Fix this by providing a corkedReader to zlib.NewReaderDict(). We uncork the reader and allow it to read the number of bytes in the compressed payload.

Fixes #1884.

R=bradfitz, rsc, go.peter.90
CC=golang-dev
https://golang.org/cl/4530089

R=rsc
CC=golang-dev
https://golang.org/cl/4560056

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/4559059

Fixes #1900.

R=ken2
CC=golang-dev
https://golang.org/cl/4561053

Fixes #1866.

R=bradfitz, rsc
CC=golang-dev
https://golang.org/cl/4548073

R=agl
CC=golang-dev
https://golang.org/cl/4551081

The change is that 1.0<<2 is now okay.

R=ken2
CC=golang-dev
https://golang.org/cl/4524084