Merge head r236710 through r238467.

IFC @238412.

IFC @ r238370

Make sure that fstab fd is not leaked on exec.

PR: kern/169023
Submitted by: Jukka Ukkonen <jau iki fi>
MFC after: 1 week

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 r232686 through r233825 into projects/pf/head.

Fix style. Somehow I managed to lost a space when copy&paste.

Pointed out by: stefanf

Prevent fs_file NULL pointer dereference in fixfsfile() uncovered after r1.5
when passing damaged user-supplied fstab file data.

MFC after: 1 week

Per Regents of the University of Calfornia letter, remove advertising
clause.

# If I've done so improperly on a file, please let me know.

- Add setfstab() and getfstab().
- Use the environment variable 'PATH_FSTAB' if set rather than the
hardcoded '/etc/fstab' (fstab.h:_PATH_FSTAB)

* Remove __P and convert to ANSI prototypes.
* Remove 'register'. (some functions had 7+ register functions...)
* Fix SCM ID's.

Compensate for "Compensate for header dethreading" by backing it out.

Removed duplicate VCS ID tags, as per style(9).

Compensate for header dethreading.

Remove _THREAD_SAFE and make libc thread-safe by default by
adding (weak definitions to) stubs for some of the pthread
functions. If the threads library is linked in, the real
pthread functions will

Remove _THREAD_SAFE and make libc thread-safe by default by
adding (weak definitions to) stubs for some of the pthread
functions. If the threads library is linked in, the real
pthread functions will pulled in.

Use the following convention for system calls wrapped by the
threads library:
__sys_foo - actual system call
_foo - weak definition to __sys_foo
foo - weak definition to __sys_foo

Change all libc uses of system calls wrapped by the threads
library from foo to _foo. In order to define the prototypes
for _foo(), we introduce namespace.h and un-namespace.h
(suggested by bde). All files that need to reference these
system calls, should include namespace.h before any standard
includes, then include un-namespace.h after the standard
includes and before any local includes. <db.h> is an exception
and shouldn't be included in between namespace.h and
un-namespace.h namespace.h will define foo to _foo, and
un-namespace.h will undefine foo.

Try to eliminate some of the recursive calls to MT-safe
functions in libc/stdio in preparation for adding a mutex
to FILE. We have recursive mutexes, but would like to avoid
using them if possible.

Remove uneeded includes of <errno.h> from a few files.

Add $FreeBSD$ to a few files in order to pass commitprep.

Approved by: -arch

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Simplify sytem call renaming. Instead of _foo() <-- _libc_foo <-- foo(),
just use _foo() <-- foo(). In the case of a libpthread that doesn't do
call conversion (such as linuxthreads and our upcomin

Simplify sytem call renaming. Instead of _foo() <-- _libc_foo <-- foo(),
just use _foo() <-- foo(). In the case of a libpthread that doesn't do
call conversion (such as linuxthreads and our upcoming libpthread), this
is adequate. In the case of libc_r, we still need three names, which are
now _thread_sys_foo() <-- _foo() <-- foo().

Convert all internal libc usage of: aio_suspend(), close(), fsync(), msync(),
nanosleep(), open(), fcntl(), read(), and write() to _foo() instead of foo().

Remove all internal libc usage of: creat(), pause(), sleep(), system(),
tcdrain(), wait(), and waitpid().

Make thread cancellation fully POSIX-compliant.

Suggested by: deischen

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Add three-tier symbol naming in support of POSIX thread cancellation
points. For library functions, the pattern is __sleep() <--
_libc_sleep() <-- sleep(). The arrows represent weak aliases. For
s

Add three-tier symbol naming in support of POSIX thread cancellation
points. For library functions, the pattern is __sleep() <--
_libc_sleep() <-- sleep(). The arrows represent weak aliases. For
system calls, the pattern is _read() <-- _libc_read() <-- read().

show more ...

Fix the fixfsfile() so that it works for both block and character devices
as root. This could fix the "filesystem still dirty after fsck" problem.

Submitted by: bde

Ignore the fs_spec entry for "/" in /etc/fstab if the device which
is actually mounted on "/" can be determined using statfs() and is
in /dev. This fixes fsck operating on the wrong device when the

Ignore the fs_spec entry for "/" in /etc/fstab if the device which
is actually mounted on "/" can be determined using statfs() and is
in /dev. This fixes fsck operating on the wrong device when the
fs_spec entry is only an alias. The aliased case became more
dangerous when the ROOTSLICE_HUNT hack was committed in mount(8).
ROOTSLICE_HUNT may be unnecessary now.

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Minor cleanup, mostly unused vars and missing #includes.

Change strtok() to strsep(), using strtok() can cause memory corruption
if user program use it too in the same time.

Make errors in /etc/fstab print the line numbers where they occured.
Also be more tolerant of blank lines and comments in the file.
Submitted by: jkh

BSD 4.4 Lite Lib Sources

Per Regents of the University of Calfornia letter, remove advertising
clause.

# If I've done so improperly on a file, please let me know.