Clean up OpenSSL error stack in `ECDH::Initialize`, some curves have
faulty implementations that are leaving dangling errors after
initializing the curve.

Fix: #4686
PR-URL: #4689
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Shigeki Ohtsu <ohtsu@iij.ad.jp>

Some variables are declared with var more than once in the same scope.
This change reduces the declarations to one per scope.

PR-URL: #4633
Reviewed-By: jasnell - James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

The previously listed default of 'http' is incorrect, and
causes an error to be thrown. This commit changes it to the
correct value of 'http:'

Fixes: #4712
PR-URL: #4714
Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #4691
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

PR-URL: #4708
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Documents the "path" property on fs.WriteStream
and fs.ReadStream. See #4327

PR-URL: #4368
Reviewed-By: James M Snell <jasnell@gmail.com>

The last sentence of the explanation for the first stream section
seemed a bit confusing. I tried to change the sentence to clarify it.

Additionally, the sections were turned into a numbered list to be more
clear about which section is being described, and improve readability.

PR-URL: #4234
Reviewed-By: James M Snell <jasnell@gmail.com>

If there's no global console cached, initialize it.

Fixes: #4467
PR-URL: #4479
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: James M Snell <jasnell@gmail.com>

Add support to fs.createWriteStream and fs.createWriteStream for an autoClose
option that behaves similarly to the autoClose option supported by
fs.createReadStream and fs.ReadStream.

When an instance of fs.createWriteStream created with autoClose === false finishes,
it is not destroyed. Its underlying fd is not closed and it is the
responsibility of the user to close it.

PR-URL: #3679
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Now returns a 417 error status or allows for an event listener on
the `checkExpectation` event. Before we were ignoring requests that
had misspelled `100-continue` values for expect headers.

This is a quick port of the work done here:
nodejs/node-v0.x-archive#7132 by alFReD-NSH
with surrounding discussion here:
nodejs/node-v0.x-archive#4651

Also updates all the instances of the deprecated
EventEmitter.listenerCount to the current self.listenerCount. Most
of these were in the new code ported over but there was another
legacy instance.

Refs: #2403
PR-URL: #4501
Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #2205
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>

PR-URL: #2205
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>

These changes improve parse() performance from ~11-30% on all of
the existing querystring benchmarks.

PR-URL: #4675
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

If one were to set NODE_REPL_HISTORY to a string that contains only a
space (" "), then the history file would be created with that name
which can cause problems are certain systems.

PR-URL: #4539
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

It's possible there is already an existing error on OpenSSL's error
stack that is unrelated to the EVP_DigestInit_ex() operation we just
executed.

Fixes: #4221
PR-URL: #4731
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Fedor Indutny <fedor@indutny.com>

This gives us the ability to preload when using the node repl. This can
be useful for doing things like creating aliases.

Fixes: #4661
PR-URL: #4696
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Provide means to inspect information about the separate heap spaces
via a callable API. This is helpful to analyze memory issues.

Fixes: #2079
PR-URL: #4463
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>

Make the byteLength work correctly when input is Buffer.

e.g:

```js
// The incomplete unicode string
Buffer.byteLength(new Buffer([0xe4, 0xb8, 0xad, 0xe6, 0x96]))
```
The old output: 9
The new output: 5

PR-URL: #4738
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Brian White <mscdex@mscdex.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

Reduce the number of stat() system calls that require() makes by caching
the results more aggressively.

To avoid unbounded growth without implementing a LRU cache, scope the
cache to the lifetime of the first call to require().  Recursive calls
(i.e. require() calls in the included code) transparently profit from
the cache.

The benchmarked application is the loopback-sample-app[0] and it sees
the number of stat calls at start-up go down by 40%, from 4736 to 2810.

[0] https://github.com/strongloop/loopback-sample-app

PR-URL: #4575
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

PR-URL: #4753
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>

Previously, test-cluster-disconnect-leak had two issues:

* Magic numbers: How many times to spawn a worker was determined through
empirical experimentation. This means that as new platforms and new
CPU/RAM configurations are tested, the magic numbers require more
and more refinement. This brings us to...

* Non-determinism: The test *seems* to fail all the time when the bug
it tests for is present, but it's really a judgment based on sampling.
"Oh, with 8 workers per CPU, it fails about 80% of the time. Let's try
16..."

This revised version of the test takes a different approach. The fix
for the bug that the test was written for means that the `disconnect`
event will fire reliably for a single worker. So we check for that and
the test still fails when the fix is not in the code base and succeeds
when it is.

Advantages of this approach include:

* The test runs much faster.
* The test now works on Windows. The previous version skipped Windows.
* The test should be reliable on any new platform regardless of CPU and
RAM.

Ref: #4674

PR-URL: #4736
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Johan Bergström <bugs@bergstroem.nu>

ReadableState has the resumeScheduled property that helps determine if
a stream should be resumed. It was not assigned in the constructor.
When stream.resume is called on a readable stream that is not flowing,
it is set to true. This changes the property map of the ReadableState
which can cause a deopt in onEofChunk and needMoreData.

PR-URL: #4761
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Brian White <mscdex@mscdex.net>

PR-URL: #4762
Reviewed-By: Rod Vagg <rod@vagg.org>

Modify tools/license-builder.sh to restore the Third-Party Software
licenses for ICU.

Also fix arguments to tail to work on Linux.

rvagg: modified sed command for ICU to replace tabs with spaces and
       remove whitespace at the end of lines

PR-URL: #4762
Reviewed-By: Rod Vagg <rod@vagg.org>

Fix a regression introduced in commit 89f056b ("node: improve
performance of hrtime()") where the nanosecond field sometimes
had a negative value when calculating the difference between two
timestamps.

Fixes: #4751
PR-URL: #4757
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>

Notable changes:

* events: make sure console functions exist (Dave) #4479
* fs: add autoClose option to fs.createWriteStream (Saquib) #3679
* http: improves expect header handling (Daniel Sellers) #4501
* node: allow preload modules with -i (Evan Lucas) #4696
* v8,src: expose statistics about heap spaces (`v8.getHeapSpaceStatistics()`) (Ben Ripkens) #4463
* Minor performance improvements:
  - lib: Use arrow functions instead of bind where possible (Minwoo Jung) #3622
  - module: cache stat() results more aggressively (Ben Noordhuis) #4575
  - querystring: improve parse() performance (Brian White) #4675

PR-URL: #4742