test: avoid compiler complaints about implicit double-to-int cast

windows: un-break the build

unix: fix SIGCHLD race in process.c

Start the SIGCHLD signal watcher before calling fork(). There was a very subtle
race where a child process could quit (and generate a SIGCHILD) before

unix: fix SIGCHLD race in process.c

Start the SIGCHLD signal watcher before calling fork(). There was a very subtle
race where a child process could quit (and generate a SIGCHILD) before the
signal handler was installed.

To reproduce, call uv_spawn() repeatedly with the below x86_64 program:

// compile with `gcc -O2 -nostdlib`
void _start(void)
{
// syscall(SYS_exit, 0)
__asm__ __volatile__ (
"xorq %rdi, %rdi;"
"xorq %rax, %rax;"
"mov $0x3c, %al;"
"syscall;"
);
for (;;);
}

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Merge branch 'v0.8'

build: rework -fvisibility=hidden detection

Make the gcc_version macro conform with what node.js and v8 use. Important
because node.js's common.gypi is going to export it soon.

unix: work around darwin bug, don't poll() on pipe

poll() on newer versions of OS X sets POLLHUP|POLLIN whereas older versions
(and other Unices) only set POLLHUP. It was tripping up a c

unix: work around darwin bug, don't poll() on pipe

poll() on newer versions of OS X sets POLLHUP|POLLIN whereas older versions
(and other Unices) only set POLLHUP. It was tripping up a check that expected
to read data when POLLIN was set.

While easy to work around, I switched it to a blocking read instead:
it's less code and avoids surprises like the one above altogether.

Fixes #522.

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darwin: emulate fdatasync() with fcntl(F_FULLFSYNC)

OS X has no public API for fdatasync. And as pointed out in `man fsync(2)`:

For applications that require tighter guarantees ab

darwin: emulate fdatasync() with fcntl(F_FULLFSYNC)

OS X has no public API for fdatasync. And as pointed out in `man fsync(2)`:

For applications that require tighter guarantees about the integrity of
their data, Mac OS X provides the F_FULLFSYNC fcntl. The F_FULLFSYNC
fcntl asks the drive to flush all buffered data to permanent storage.
Applications, such as databases, that require a strict ordering of writes
should use F_FULLFSYNC to ensure that their data is written in the order
they expect. Please see fcntl(2) for more detail.

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unix, windows: remove handle init counters

Remove the handle init counters, no one uses them.

unix: rework uv_eio_init() init once logic

Don't use counters.eio_init to track if libeio has been initialized, it's going
to be removed in a follow-up commit.

unix: remove dependency on ev_child

unix, windows: preliminary signal handler support

* a no-op on Windows for now
* only supports the main loop on UNIX (again, for now)

Allow inclusion of <uv.h> with Sun Studio compiler

The Sun Studio compiler did not define any of the symbols used to determine if
the system was a unix-like system or not causing it to i

Allow inclusion of <uv.h> with Sun Studio compiler

The Sun Studio compiler did not define any of the symbols used to determine if
the system was a unix-like system or not causing it to include the windows
header.

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Allow headers to be included with -Werror and -Wundef

Users of the library may enforce a stricter set of compiler warnings causing
their builds to fail due to warnings emitted from the h

Allow headers to be included with -Werror and -Wundef

Users of the library may enforce a stricter set of compiler warnings causing
their builds to fail due to warnings emitted from the headers.

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unix: remove dead code in process.c

uv_spawn() saves and restores the environ in case the child clobbers it -
which is impossible because the child process runs in a separate address spa

unix: remove dead code in process.c

uv_spawn() saves and restores the environ in case the child clobbers it -
which is impossible because the child process runs in a separate address space.

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unix: simplify stdio handling in process.c

unix: retrieve execve() errors in process.c

Make the forked child process send the errno to its parent process when it
fails to spawn a new process.

unix: drop SPAWN_WAIT_EXEC guard in process.c

Code cleanup. This "experimental" feature was always enabled anyway, might as
well remove the define guard.

windows: don't duplicate invalid stdio handles

Ref: joyent/node#3779

include: fix macro formatting

windows: fix typos in process-stdio.c

include: link to Nikhil Marathe's libuv ebook

unix: fix const correctness compiler warning

Rip out c-ares

Remove c-ares integrations

Remove c-ares tests and benchmarks