windows: relay TCP bind errors via ipc

This is the libuv side of the fix for Node's cluster module on Windows.
https://github.com/joyent/node/issues/7691

Windows and Unix return

windows: relay TCP bind errors via ipc

This is the libuv side of the fix for Node's cluster module on Windows.
https://github.com/joyent/node/issues/7691

Windows and Unix return certain socket errors (i.e. EADDRINUSE) at
different times: bind on Windows, and listen on Unix.
In an effort to hide this difference, libuv on Windows stores such
errors in the bind_error field of uv_tcp_t, to defer raising it at
listen time.
This worked fine except for the case in which a socket is shared in
a Node cluster and a bind error occurs.

A previous attempt to fix this (
https://github.com/joyent/libuv/commit/d1e6be1460f555a1f8a4063d7642696aa7238769
https://github.com/joyent/node/commit/3da36fe00e5d85414031ae812e473f16629d8645
) was flawed becaused in an attempt to relay the error at the JS level
it caused the master to start accepting connections.

With this new approach, libuv itself is relaying the bind errors,
providing for a uniform behavior of uv_tcp_listen.

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fs: `uv__cloexec()` opened fd

Every file descriptor opened using libuv should be automatically marked
as CLOEXEC to prevent it from leaking to a child process. Note that
since we are

fs: `uv__cloexec()` opened fd

Every file descriptor opened using libuv should be automatically marked
as CLOEXEC to prevent it from leaking to a child process. Note that
since we are opening fds in a thread pool, there is a possible race
condition between `uv_spawn()` and the `open()` + `uv__cloexec()`. The
rwlock was added to avoid it.

see https://github.com/joyent/node/issues/6905

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test: support flexibly setting custom task options

Add a single TEST_ENTRY_CUSTOM hook that can be used to override task
entry defaults. Different tests can have different timeouts depen

test: support flexibly setting custom task options

Add a single TEST_ENTRY_CUSTOM hook that can be used to override task
entry defaults. Different tests can have different timeouts depending on
what is appropriate for each test. A separate TEST_OUTPUT_ENTRY hook is
no longer necessary.

In order to support per-task timeouts, the timeout field has been moved
into the task_entry_t struct. The default (5000) is now set as part of
TEST_ENTRY.

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test: add tap output

Given UV_TAP_OUTPUT being set, test result output should use TAP formatting

test, bench: replace strlen() with sizeof()

test: fix -Wunused-result warnings

unix: do not set environ unless one is provided

Currently, `uv_spawn` will set `environ` to the value of `options.env`, even if
`options.env` is `NULL`. This results in child processes

unix: do not set environ unless one is provided

Currently, `uv_spawn` will set `environ` to the value of `options.env`, even if
`options.env` is `NULL`. This results in child processes for whom `environ ==
NULL`, which can cause a variety of unexpected issues.

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test: fix implicit function declaration warnings

Fixes the two following compiler warnings:

../test/run-tests.c: In function ‘maybe_run_test’:
../test/run-tests.c:117: warni

test: fix implicit function declaration warnings

Fixes the two following compiler warnings:

../test/run-tests.c: In function ‘maybe_run_test’:
../test/run-tests.c:117: warning: implicit declaration of function ‘write’
../test/run-tests.c:118: warning: implicit declaration of function ‘fsync’

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test: stdin/out/err should be set to /dev/null when ignored

windows: fix undefined function warning in run-tests.c

test: test for uv_spawn with stdio_count == 3

windows: Enable passing of TCP connections over IPC

test: test cross-process handle send/recv

Merge remote-tracking branch 'origin/v0.6'

Conflicts:
src/win/pipe.c
test/run-tests.c

Test runner: fix compiler warnings

Fold trailing whitespace

test: add proper type casts

Merge remote-tracking branch 'origin/v0.6'

support half-duplex pipes

windows: when sharing a server socket, only call listen in the parent process

windows: ref pipe writes to keep the event loop alive

windows: stdio over non-overlapped pipes

ipc on windows

make test-ipc accept the pending tcp server

Add server to ipc_helper