unix: sanity-check fds before closing

Ensure that close() system calls don't close stdio file descriptors
because that is almost never the intention.

This is also a partial work

unix: sanity-check fds before closing

Ensure that close() system calls don't close stdio file descriptors
because that is almost never the intention.

This is also a partial workaround for a kernel bug that seems to affect
all Linux kernels when stdin is a pipe that gets closed: fd 0 keeps
signalling EPOLLHUP but a subsequent call to epoll_ctl(EPOLL_CTL_DEL)
fails with EBADF. See joyent/node#6271 for details and a test case.

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unix: wrap long lines at 80 columns

unix: fix uv__signal_unlock() prototype

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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Merge remote-tracking branch 'origin/v0.10'

Conflicts:
ChangeLog
src/unix/stream.c
src/version.c

unix: appease warning about non-standard `inline`

Clang warns about using `inline`, which is not technically allowed in
C89 mode (libuv compiles with `-std=c89`). It's probably best to l

unix: appease warning about non-standard `inline`

Clang warns about using `inline`, which is not technically allowed in
C89 mode (libuv compiles with `-std=c89`). It's probably best to leave
it to the compiler to do the inlining anyway.

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unix: fix assert on signal pipe overflow

An incorrect assert() statement was causing libuv to crash when writing
to an internal signal pipe would result in EAGAIN/EWOULDBLOCK.

T

unix: fix assert on signal pipe overflow

An incorrect assert() statement was causing libuv to crash when writing
to an internal signal pipe would result in EAGAIN/EWOULDBLOCK.

This commit doesn't solve the underlying issue that the signal pipe can
overflow.

This should fix joyent/node#5538

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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: don't clobber errno in signal handler

unix: fix up function prototypes in signal.c

unix: rename UV__IO_* constants

unix: remove dependency on libev

unix: squelch -Wunused-but-set-variable warnings

unix: support signal handlers outside the main loop

unix, windows: preliminary signal handler support

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