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

Conflicts:
src/win/util.c

Add uv_loop_refcount() function, debug tool.

unix: remove unused #define

unix: use EVRUN_ONCE in uv_run_once()

EVRUN_NOWAIT means "poll and don't block". Use EVRUN_ONCE instead, "wait for
single event".

unix: create separate eio result queue per loop

Makes the eio "done" callback run in the thread that submitted it. Makes it safe
to use libeio from multiple event loops.

unix: centralize loop init logic

Also fixes a bug where loops other than the main loop didn't pick the kqueue
backend, which broke the fs event watcher on Darwin and the BSDs.

linux: improve kernel feature detection

Do not check for minimum kernel and glibc versions, just check that the kernel
headers export the syscall number and invoke the syscall directly.

linux: improve kernel feature detection

Do not check for minimum kernel and glibc versions, just check that the kernel
headers export the syscall number and invoke the syscall directly. Effectively
bypasses glibc.

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add uv_run_once()

Merge branch 'v0.6'

Conflicts:
test/test-list.h

Fix missing increments of loop->counters

Merge branch 'v0.6'

unix: make it safe to delete the default loop

Fixes a potential free() of non-malloc'ed memory.

Merge branch 'v0.6'

Conflicts:
src/unix/core.c
src/win/winapi.h

uv_cwd + uv_chdir

util: add uv_strlcpy() and uv_strlcat() functions

linux: improve kernel feature detection

Do not check for minimum kernel and glibc versions, just check that the kernel
headers export the syscall number and invoke the syscall directly.

linux: improve kernel feature detection

Do not check for minimum kernel and glibc versions, just check that the kernel
headers export the syscall number and invoke the syscall directly. Effectively
bypasses glibc.

show more ...

sunos: add getaddrinfo() compatibility hack

getaddrinfo() returns EAI_MEMORY if strlen(hostname) >= MAXHOSTNAMELEN

linux: fall back to traditional syscalls if necessary

libuv uses feature checks to determine if newer syscalls like pipe2() are
available. This works fine until someone compiles libuv ag

linux: fall back to traditional syscalls if necessary

libuv uses feature checks to determine if newer syscalls like pipe2() are
available. This works fine until someone compiles libuv against kernel headers
that are newer than the actual kernel our software runs on.

Fall back to traditional (but race-y!) syscalls when the kernel reports ENOSYS
or EINVAL.

show more ...

Fix uv_loop_new() and uv_default_loop() function prototypes.

unix: add EAI_NODATA #ifdef guard, freebsd doesn't have it

unix: add getaddrinfo compatibility hack

Revisit in the future. This is not a good hack.

linux: omit superfluous fcntl(F_GETFD) syscall

linux: use ioctl(FIONBIO) to set O_NONBLOCK, saves a syscall

unix: have uv_strerror() handle getaddrinfo() errors

unix: fix uv_freeaddrinfo() segfault on sunos

The system freeaddrinfo() on SunOS does not handle NULL values graciously.