unix: fix various memory leaks and undef behavior

Kindly suggested by `cppcheck`.

fsevents: fix subfolder check

First of all, a bit of explanation of what happens there:

1. FSEvents emits absolute paths to changed files or directories
2. We cut off the first

fsevents: fix subfolder check

First of all, a bit of explanation of what happens there:

1. FSEvents emits absolute paths to changed files or directories
2. We cut off the first part of such paths, which is equal to handle's
real path ('/dir/subdir/subsubdir`, without trailing slash)
3. Then, if we are running in non-recursive mode, we discard paths that
have slashes ('/') as a non-first character in them

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fsevents: use FlagNoDefer for FSEventStreamCreate

Otherwise `FSEventStreamCreate()` will coalesce events, even if they're
happening in the interval, bigger than supplied `latency`. In ot

fsevents: use FlagNoDefer for FSEventStreamCreate

Otherwise `FSEventStreamCreate()` will coalesce events, even if they're
happening in the interval, bigger than supplied `latency`. In other
words, if this flag is not set events will happen in separate callback
only if there was a delay bigger than `latency` between two consecutive
events.

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fsevents: use native character encoding file paths

Create file paths with CFStringCreateWithFileSystemRepresentation(),
not CFStringCreateWithCString().

Reapplies 3780e12 ("fsev

fsevents: use native character encoding file paths

Create file paths with CFStringCreateWithFileSystemRepresentation(),
not CFStringCreateWithCString().

Reapplies 3780e12 ("fsevents: support japaneese characters in path")
from the v0.10 branch. Was dropped in the last v0.10 -> master merge
for failing to apply.

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fsevents: report errors to user

fsevents: increase stack size for OSX 10.9

Otherwise it fails with `EXC_BAD_ACCESS`.

unix, windows: add uv_fs_event_start/stop functions

Make uv_fs_event behave like other handles, that is, it's inactive after
init, and it's active between start and stop.

fsevents: fix clever rescheduling

There're could be a situation, where one fsevents handle gets created
and another one is destroyed simultaneously. In such cases
`fsevent_need_resch

fsevents: fix clever rescheduling

There're could be a situation, where one fsevents handle gets created
and another one is destroyed simultaneously. In such cases
`fsevent_need_reschedule` will be set to 1 twice and reset only once,
leaving handle destructor hanging in uv_sem_wait().

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darwin: fix 10.6 build error in fsevents.c

Work around an 'initializer element is not constant' build error in
src/unix/fsevents.c by turning the const int flags into #defines.

darwin: fix 10.6 build error in fsevents.c

Work around an 'initializer element is not constant' build error in
src/unix/fsevents.c by turning the const int flags into #defines.

Only an issue on OS X 10.6 due to the old compiler it uses.

Fixes #908.

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darwin: remove CoreFoundation dependency

Load the required symbols at run-time rather than linking against the
CoreFoundation (and CoreServices and ApplicationServices) frameworks
at

darwin: remove CoreFoundation dependency

Load the required symbols at run-time rather than linking against the
CoreFoundation (and CoreServices and ApplicationServices) frameworks
at build time.

Should make integration easier for people that bundle libuv with their
own projects because they no longer have to replicate magic -framework
incantations in their top-level build system.

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fsevents: use shared FSEventStream

It seems that number of simultaneously opened FSEventStreams is
limited on OSX (i.e. you can have only fixed number of them on
one running system),

fsevents: use shared FSEventStream

It seems that number of simultaneously opened FSEventStreams is
limited on OSX (i.e. you can have only fixed number of them on
one running system), getting past through this limit will cause
`FSEventStreamCreate` to return false and write following message
to stderr:

(CarbonCore.framework) FSEventStreamStart: register_with_server:
ERROR: f2d_register_rpc() => (null) (-21)

To prevent this, we must use only one shared FSEventStream with a
paths for all uv_fsevent_t handles, and then filter out events for
each handle using this paths again.

See https://github.com/joyent/node/issues/5463

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fsevents: FSEvents is most likely not thread-safe

Perform all operation with FSEventStream in the same thread, where it'll
be used.

darwin: fix ios compiler warning

uv__fsevents_loop_delete() returns void. Remove the 'return 0'
statement.

darwin: reduce fsevents thread stack size

The fsevents watcher thread only needs a minimal amount of stack space
in order to run. Restrict its stack size so there's more address space

darwin: reduce fsevents thread stack size

The fsevents watcher thread only needs a minimal amount of stack space
in order to run. Restrict its stack size so there's more address space
left for the libuv user.

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darwin: create fsevents thread on demand

* Move CF run loop code to fsevents.c.

* Create the fsevents thread on demand rather than at startup.

* Remove use of ACCESS_ONCE.

darwin: create fsevents thread on demand

* Move CF run loop code to fsevents.c.

* Create the fsevents thread on demand rather than at startup.

* Remove use of ACCESS_ONCE. All accesses to loop->cf_loop are
protected by full memory barriers so no reordering can take place.

Fixes #872.

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unix, windows: return error codes directly

This commit changes the libuv API to return error codes directly rather
than storing them in a loop-global field.

A code snippet like

unix, windows: return error codes directly

This commit changes the libuv API to return error codes directly rather
than storing them in a loop-global field.

A code snippet like this one:

if (uv_foo(loop) < 0) {
uv_err_t err = uv_last_error(loop);
fprintf(stderr, "%s\n", uv_strerror(err));
}

Should be rewritten like this:

int err = uv_foo(loop);
if (err < 0)
fprintf(stderr, "%s\n", uv_strerror(err));

The rationale for this change is that it should make creating bindings
for other languages a lot easier: dealing with struct return values is
painful with most FFIs and often downright buggy.

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unix, windows: remove ngx-queue.h

Avoids an extra #include in public headers and stops the ngx_queue_*
types and macros from leaking into user code.

unix: remove dependency on libev

darwin: make it possible to compile for iOS

Relocate the include of TargetConditionals.h and fixe the use of
TARGET_OS_IPHONE. Furthermore, uv__fsevents_init() and uv__fsevents_close are

darwin: make it possible to compile for iOS

Relocate the include of TargetConditionals.h and fixe the use of
TARGET_OS_IPHONE. Furthermore, uv__fsevents_init() and uv__fsevents_close are
now empty functions for iOS, since the FSEvents API is not available there.

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darwin: fsevents: emit UV_CHANGE on metadata change

darwin: fix 'directive in macro' compiler warning

darwin: emit relative path in fsevents

darwin: use FSEvents to watch directory changes