sync from head

IFC @247348.

libc/opendir: Improve behaviour of union uniquifier:

* Reopen the directory using openat(fd, ".", ...) instead of opening the
pathname again. This fixes a race condition where the meaning of the

libc/opendir: Improve behaviour of union uniquifier:

* Reopen the directory using openat(fd, ".", ...) instead of opening the
pathname again. This fixes a race condition where the meaning of the
pathname changes and allows a reopen with fdopendir().
* Always reopen the directory for union stacks, not only when DTF_REWIND
is passed. Applications should be able to fchdir(dirfd(dir)) and
*at(dirfd(dir), ...). DTF_REWIND now does nothing.

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MFC @ r241285

IFC @ r242684

Sync from head

libc: Use O_CLOEXEC for various internal file descriptors.

This fixes a race condition where another thread may fork() before CLOEXEC
is set, unintentionally passing the descriptor to the child proc

libc: Use O_CLOEXEC for various internal file descriptors.

This fixes a race condition where another thread may fork() before CLOEXEC
is set, unintentionally passing the descriptor to the child process.

This commit only adds O_CLOEXEC flags to open() or openat() calls where no
fcntl(fd, F_SETFD, FD_CLOEXEC) follows. The separate fcntl() call still
leaves a race window so it should be fixed later.

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IFC @ r238370

IFC @ r236291.
Diff reductions to the enclosure driver made in r235911.

Merge head r233826 through r236168.

Hide DIR definition by making it an opaque struct typedef.

Introduce dirfd() libc exported symbol replacing macro with same name,
preserve _dirfd() macro for internal use.

Replace dirp->dd_fd with

Hide DIR definition by making it an opaque struct typedef.

Introduce dirfd() libc exported symbol replacing macro with same name,
preserve _dirfd() macro for internal use.

Replace dirp->dd_fd with dirfd() call. Avoid using dirfd as variable
name to prevent shadowing global symbol.

Sponsored by: Google Summer Of Code 2011

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MFC

IFC @ r234692

sys/amd64/include/cpufunc.h
sys/amd64/include/fpu.h
sys/amd64/amd64/fpu.c
sys/amd64/vmm/vmm.c

- Add API to allow vmm FPU state init/save/restore.

FP stuff discussed with: kib

Merge head up to r232685 to projects/pf/head.

Finally removed the stat() and fstat() calls from the opendir() code.
They were made excessive in r205424 by opening with O_DIRECTORY.
Also eliminated the fcntl() call used to set FD_CLOEXEC by openi

Finally removed the stat() and fstat() calls from the opendir() code.
They were made excessive in r205424 by opening with O_DIRECTORY.
Also eliminated the fcntl() call used to set FD_CLOEXEC by opening
with O_CLOEXEC.

(fdopendir() still checks that the passed descriptor is a directory,
and sets FD_CLOEXEC on it.)

Reviewed by: ed

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IFC @230489 (pending review).

IFC to head to catch up the bhyve branch

Approved by: grehan@

fdopendir(): Do not close the passed file descriptor on failure.

Reviewed by: delphij

Update to current version of head.

Let opendir() use O_DIRECTORY.

I am not removing the fstat() calls here, since we cannot yet assume
people will always run kernels that respect O_DIRECTORY.

IFH@204581

Merge scandir(3) interface update to stable/8.

MFC r201512:
Modernize scandir(3) and alphasort(3) interfaces according to the IEEE
Std 1003.1-2008.

MFC r201602:
Move scandir(3) and alphasort(3) int

Merge scandir(3) interface update to stable/8.

MFC r201512:
Modernize scandir(3) and alphasort(3) interfaces according to the IEEE
Std 1003.1-2008.

MFC r201602:
Move scandir(3) and alphasort(3) into XSI namespace.

MFC r201604:
Use thunks to adapt alphasort-like interface to the comparision function
required by qsort() and qsort_r().

MFC r202556 (by ache):
Use strcoll() in opendir() and alphasort(). Remove some comments.

MFC r202572 (by ache):
Revert to using strcmp() for opendir().

MFC r202677 (by ache):
Style.

MFC r202679 (by ache):
Style: rename internal function to opendir_compar().

MFC r202691 (by ache):
For alphasort(3) add reference to strcoll(3).

MFC r202693 (by ache):
Style: reword comment.

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Style: rename internal function to opendir_compar()

Pointed by: bde

Double checking my commit I found that comment saying that
POSIX 2008 and XSI 7require strcoll() for opendir() is not true.
I can't find such requirement in POSIX 2008 and XSI 7.

So, back out that p

Double checking my commit I found that comment saying that
POSIX 2008 and XSI 7require strcoll() for opendir() is not true.
I can't find such requirement in POSIX 2008 and XSI 7.

So, back out that part of my commit, returning old strcmp(), and remove
this misleading comment.

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a) Use strcoll() in opendir() and alphasort() as POSIX 2008 requires.
It also matches now how our 'ls' works for years.

b) Remove comment expressed 2 fears:
1) One just simple describe how strco

a) Use strcoll() in opendir() and alphasort() as POSIX 2008 requires.
It also matches now how our 'ls' works for years.

b) Remove comment expressed 2 fears:
1) One just simple describe how strcoll() works in _any_ context,
not for directories only. Are we plan to remove strcoll() from everything
just because it is little more complex than strcmp()? I doubt, and
directories give nothing different here. Moreover, strcoll() used
in 'ls' for years and nobody complaints yet.

2) Plain wrong statement about undefined strcoll() behaviour. strcoll()
always gives predictable results, falling back to strcmp() on any
trouble, see strcoll(3).

No objections from -current list discussion.

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