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.

unix: always set CLOEXEC flag for child process stdio FDs

unix: simplify uv__make_pipe() and uv__make_socketpair()

unix: remap fds 0-2 to /dev/null if ignore flag set

change spawn() api to allow using existing streams for stdio

This commit also adds support for this api on Unix.

process: implement UV_PROCESS_DETACHED flag for uv_spawn

unix: allow specifying FDs to be inherited by a child process

Previously the only option was to create a pipe or an ipc channel. This
patch makes it possible to inherit a handle that is

unix: allow specifying FDs to be inherited by a child process

Previously the only option was to create a pipe or an ipc channel. This
patch makes it possible to inherit a handle that is already open in the
parent process. It also makes it possible to set more than just stdin,
stdout and stderr.

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unix, windows: rework reference counting scheme

This commit changes how the event loop determines if it needs to stay alive.

Previously, an internal counter was increased whenever a

unix, windows: rework reference counting scheme

This commit changes how the event loop determines if it needs to stay alive.

Previously, an internal counter was increased whenever a handle got created
and decreased again when the handle was closed.

While conceptually simple, it turned out hard to work with: you often want
to keep the event loop alive only if the handle is actually doing something.
Stopped or inactive handles were a frequent source of hanging event loops.

That's why this commit changes the reference counting scheme to a model where
a handle only references the event loop when it's active. 'Active' means
different things for different handle types, e.g.:

* timers: ticking
* sockets: reading, writing or listening
* processes: always active (for now, subject to change)
* idle, check, prepare: only active when started

This commit also changes how the uv_ref() and uv_unref() functions work: they
now operate on the level of individual handles, not the whole event loop.

The Windows implementation was done by Bert Belder.

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Unix: namespace stream handle flags

linux: fix build error with old kernel headers

O_CLOEXEC was introduced in linux 2.6.23, don't assume it's available.

Fixes #400.

uv_spawn: support setting the child process' user and group id

unix: move handle specific close logic out of core.c

linux: tidy up syscall code

unix: fix TARGET_OS_IPHONE conditional

unix: replace uv__close() with close()

uv__close() was deprecated a while ago. It's been an alias for close() ever
since. Remove it.

Revert b3e0ad4, 149d32c, e99fdf0 and ea9baef.

Detaching doesn't work yet, the setsid() call fails and leaves the child process
attached to the parent's session.

Revert "test: Ad

Revert b3e0ad4, 149d32c, e99fdf0 and ea9baef.

Detaching doesn't work yet, the setsid() call fails and leaves the child process
attached to the parent's session.

Revert "test: Add test case for spawning detached child processes."
Revert "win: Implement options.detached for uv_spawn() for Windows."
Revert "unix: Implement options.detached for uv_spawn() for unix."
Revert "Add "detached" member to uv_process_options_t to denote whether a child
process should spawn detached from its parent."

This reverts commit ea9baef95ce2208dbf65cba0ddcd90be5492a648.
This reverts commit e99fdf0df6738dc9addc432f091896d7f37f7731.
This reverts commit 149d32cb96592fc5037c7072e1a3ab9a3fa888a6.
This reverts commit b3e0ad4db850a76d1d2c722f93402b3b9f453c55.

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unix: fix build on iOS

_NSGetEnviron() doesn't exist on iOS, use plain `extern char **environ` instead.

unix: Implement options.detached for uv_spawn() for unix.

unix: expose uv__make_socketpair, uv__make_pipe in unix/internal.h

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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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.

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uv_kill