Fixes golang/go#23361

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Because you can't bind a thread to the second CPU if it's not there.

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The timeout parameter might be nil, don't dereference it
unconditionally.

CL 97819 did the same for the syscall package.

Updates golang/go#24189

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The existing implementation requires QUERY_VALUE and ENUMERATE_SUB_KEYS permissions to enumerate
subkeys, so, using registry key name limits, Stat function could be excluded
from methods body and improved method requires only ENUMERATE_SUB_KEYS permission

Registry elements size limits described there:
https://msdn.microsoft.com/library/windows/desktop/ms724872.aspx

Fixes golang/go#23869

Change-Id: Id96beb9b0b294f01cc6eb1bb53bee5f50d02ea7e
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Add all IFLA_* constants defined in linux/if_link.h as of Linux kernel
version 4.15.

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Also use the Ubuntu 17.10 docker image and additionally install bison
which is needed by the glibc build.

The resulting change only consists of a few additional constants.
Exclude the X86_CR3_PCID_NOFLUSH constant on 386 and amd64, though.

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Same as CL 34379, SyscallNoError and RawSyscallNoError are redeclared
for gccgo builds since CL 85756. Thus, move the declarations to a gc
specific file.

Updates golang/go#18312

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Fixes golang/go#23639

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The SyscallNoError and RawSyscallNoError functions are only needed on
Linux. Make sure they are not used within the generated zsyscall_*.go
files if $GOOS != "linux".

Updates golang/go#22924

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The second part of the godoc sentence appears twice.

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Add rudimentary godoc for all existing Sockaddr* types implementing the
Sockaddr interface.

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Copy zsyscall_plan9_arm.go from syscall and add asm_plan9_arm.s which
just contains jumps to the corresponding syscall functions.

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The sockaddr_l2 address type is used with AF_BLUETOOTH sockets using the
BTPROTO_L2CAP protocol.

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Fixes golang/go#18632.

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Just call syscall's implementation instead of duplicating ParseDirent
and the GOOS-specific private functions needed by it.

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CL 87555 added the AT_STATX_* constants which are garbled on linux/s390x due
to the replacement regex in mkpost.go being too broad. Adjust the regex to
only match on word boundaries.

Change-Id: I898547fbbbc5d02965e86300e9144fb65207ab33
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statx(2) allows to get enhanced file status information (not currently
available through the existing stat syscalls), lightweight stat,
heavyweight stat. The Statx_t type used by Statx has consistent field
sizes on all arches (with year-2038-capable timestamps) and is closer to
the BSD implementation of Stat_t.

See http://man7.org/linux/man-pages/man2/statx.2.html for details. The
syscall was added in Linux kernel 4.11.

See https://github.com/tklauser/statx for an example of how this
function and types can be used to report stat(1)-like file status
information.

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Follow CL 2810

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The cgroupstats structure is available via Linux's generic netlink
taskstats interface.

For more information, please see:
https://www.kernel.org/doc/Documentation/accounting/cgroupstats.txt.

Fixes golang/go#23388.

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Initially added in https://golang.org/cl/9842 and
subsequently broken in https://golang.org/cl/85756.

Fixes golang/go#23361

Change-Id: Id458efdb4a9ffc5f038b4070fd514de9f78c17d7
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Unsetenv was in its own file for Go 1.4 compatibility. This version is
no longer supported, so move Unsetenv with the other environment
specific functions.

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Unsetenv was in its own file for Go 1.4 compatibility. This version is
no longer supported, so move Unsetenv with the other environment
specific functions.

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Unsetenv was in its own file for Go 1.4 compatibility. This version is
no longer supported, so move Unsetenv with the other environment
specific functions.

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Don't use math/bits yet. Go 1.8 doesn't have it, and Go 1.8 is still
supported for a few weeks.

Fixes golang/go#23353

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SchedGetaffinity and SchedSetaffinity are used to get and set a thread's
CPU affinity mask.

See http://man7.org/linux/man-pages/man2/sched_setaffinity.2.html for
details.

Also add a manual implementation of CpuSet_t and the corresponding
accessor functions (mimicking the CPU_* macros from sched.h).

Fixes golang/go#11243

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28a72765 causes following error with GOARCH=arm64 environment.

  # golang.org/x/sys/unix
  asm: InitTextSym double init for "".Syscall
  asm: symbol "".Syscall listed multiple times
  asm: invalid encoding for argument 00004 (/home/junya/go/src/golang.org/x/sys/unix/asm_linux_arm64.s:21)        CALL    runtime.entersyscall(SB)
  asm: invalid encoding for argument 00048 (/home/junya/go/src/golang.org/x/sys/unix/asm_linux_arm64.s:32)        CALL    runtime.exitsyscall(SB)
  asm: makeFuncDebugEntry double process "".Syscall
  asm: assembly failed

Change-Id: Ic7895fecc5f4b1fd6ebef63603c5f720227f5130
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Add the SyscallNoError and RawSyscallNoError wrapper functions which are
used for syscalls that don't return an error. Also convert all applicable
syscalls to use these wrappers.

Updates golang/go#22924

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The var e error declaration is shadowed inside the for loop, so the
outer e always stays nil. Also, there is no need to reset the inner e in
case of EPERM, as it is reset by ExattrList* on the next iteration
anyhow.

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SYS_EXECVE and SYS_FCNTL were needed for compatibility reasons in
syscall, but they are not needed in x/sys/unix.

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Test for correct timeout behavior of Select and Pselect

Updates golang/go#22246

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No need to use err1 and err2, because there is no mode like in
TestChdirAndGetwd (from os/os_test.go). Also, call fd.Close() via defer.

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As suggested by Brad in CL 83275.

From what I can tell getsockopt syscall on these OSes doesn't return
ERANGE in any case, so these versions don't include the buffer growing.

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All BSDs provide the SYS___GETCWD syscall which can be used to implement
Getwd.

Also add a test based on TestChdirAndGetwd from os/os_test.go

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Fixes golang/go#23121

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Add function TimeToTimespec for converting time.Time to Timespec.

Fixes golang/go#23078.

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