linux: add futimes() fallback

The utimensat() syscall was added in 2.6.22. Add a fallback mode for
older kernels that uses utimes("/proc/self/fd/<fd>").

Fixes #687.

linux: use stdint types in structs

Use the typedefs from stdint.h to avoid build breakage on systems
where __u64 and friends are hidden when --std=c89 is in effect.

Fixes #685.

test: make threadpool tests valgrind-compliant

Delete the event loop after the test to stop valgrind from complaining
about memory leaks.

unix, windows: rename uv_run2 to uv_run

This changes the prototype of uv_run() from:

int uv_run(uv_loop_t* loop);

To:

int uv_run(uv_loop_t* loop, uv_run_mode m

unix, windows: rename uv_run2 to uv_run

This changes the prototype of uv_run() from:

int uv_run(uv_loop_t* loop);

To:

int uv_run(uv_loop_t* loop, uv_run_mode mode);

Where `mode` is UV_RUN_DEFAULT, UV_RUN_ONCE or UV_RUN_NOWAIT.

Fixes #683.

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test: remove bad tcp_write_error test

It makes the assumption that if you try to write to a localhost socket
often enough, eventually its send queue will fill up - which doesn't
happ

test: remove bad tcp_write_error test

It makes the assumption that if you try to write to a localhost socket
often enough, eventually its send queue will fill up - which doesn't
happen if the machine it's running on is fast enough.

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unix: make stream.c more DRY

unix: make assertion message more descriptive

linux: only pack struct uv__epoll_event on x86_64

On i386, it does not need packing; it's 12 bytes packed or unpacked.

On ARM, it's actively harmful: the struct is 12 bytes when pac

linux: only pack struct uv__epoll_event on x86_64

On i386, it does not need packing; it's 12 bytes packed or unpacked.

On ARM, it's actively harmful: the struct is 12 bytes when packed and
16 bytes when unpacked.

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build: fix host/target arch detection

Setting the target_arch without setting the host_arch as well was
effectively broken.

Revert "unix: improve uv_guess_handle() implementation"

This reverts commit 98bcddc8dddb4b85425d846f546e81e8ccf633f8.

It's making a lot of tests in the node.js test suite fail.

unix: set closed fd to -1, avoid double close bugs

* abort() if close() fails
* set fd to -1 after close() to prevent double close bugs

unix: clean up code in process.c

unix: don't swap stdin file descriptors

Bug introduced in 47f496a. It turns out the file descriptors of the
stdin pipe don't have to be swapped around.

include: fix typos in comments

unix: omit second fcntl() call if possible

Omit the fcntl() syscall when the O_NONBLOCK or FD_CLOEXEC is already
set/clear because it's a no-op in that case.

build: make clean target remove libuv.{a,so,dylib}

linux: ensure that all CPUs have model information

unix: improve uv_guess_handle() implementation

uv_guess_handle is currently squelching both fifo and all
sockets on to the UV_NAMED_PIPE type. Rather than treating
all sockets as UV_

unix: improve uv_guess_handle() implementation

uv_guess_handle is currently squelching both fifo and all
sockets on to the UV_NAMED_PIPE type. Rather than treating
all sockets as UV_NAMED_PIPE, use getsockopt() and
getsockaddr() to determine if the socket is an AF_UNIX
stream (in which case return UV_NAMED_PIPE), or an AF_INET
stream (in which case return UV_TCP), or an AF_INET datagram
socket (in which case return UV_UDP).

Additionally, currently all other file descriptor types are
squelched to the UV_FILE type. Instead, only file descriptors
that are marked as regular files are treated as UV_FILE. All
other types (such as directories, character and block devices)
are now treated as UV_UNKNOWN_HANDLE.

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unix: fix GNU-ism introduced in edd1007

Don't use features.h, it's only available on GNU/glibc systems.

test: fix #if defined checks

Same as edd1007 but this time for the tests.

test: simplify tcp_ref2b

Said test doesn't need its own close callback, it can piggyback on the
common close callback.

test: remove unused function declaration

test, bench: make functions/variables static

Make functions and variables that are local to the compilation unit
static. Remove what turns out to be unused.

test, bench: ANSI-fy function prototypes

Replace `void f()` with `void f(void)`; the former means "a function
that takes any number of arguments, including none" while the latter
is

test, bench: ANSI-fy function prototypes

Replace `void f()` with `void f(void)`; the former means "a function
that takes any number of arguments, including none" while the latter
is what is actually intended: a function taking no arguments.

The first form also isn't strictly conforming ANSI/ISO C.

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linux: fix race in uv_resident_set_memory()

uv_resident_set_memory() used a global buffer to read data into, which
is a decidedly unsafe thing to do in a multi-threaded environment.