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.

Change-Id: I119c7119ff50401eed3d7369a7709d8c779a7f9e
Reviewed-on: https://go-review.googlesource.com/90095Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

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

Change-Id: Ida7d1e8756477b54fc773f4bc978002c3d4a376d
Reviewed-on: https://go-review.googlesource.com/89775Reviewed-by: Ian Lance Taylor <iant@golang.org>

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.

Change-Id: I263cfd3bb5920a8c1187ead6c2e0527276575d9f
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Fixes golang/go#18632.

Change-Id: I9d07937dc93f860b09a99a86fe517b85f4dcd1b2
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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.

Change-Id: I9e9642b5b42a393f94fd532453888ce9ba4f0003
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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.

Change-Id: I8a05a3875209e99a427d54049eacc98f415e44cf
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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
Reviewed-on: https://go-review.googlesource.com/86755Reviewed-by: Ian Lance Taylor <iant@golang.org>

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.

Change-Id: I8b6621993f2ab0fbafe900b19dcaee7b5b3ed26f
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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.

Change-Id: I63d67e2a9e4d7651be79c2e72a7f27fe0fac68c4
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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.

Change-Id: I81ed5182297598a7b3859711211ec8ef194bbe9a
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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

Change-Id: Ie69163f6f6dca95d4652441849e0152d2e346cd0
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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

Change-Id: Ia5abc0053cd06810b3b09ab65c27434f5323c1ad
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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
Reviewed-on: https://go-review.googlesource.com/86135Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

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

Change-Id: Ie143abc99de8d12d36b67ac278e08d7565f73ce0
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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.

Change-Id: Ib395e34b5a390a5d37bee334c44f6f87d3add2a0
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Change-Id: I9aa4ac170c361e56e36bded0cc13fb99346f70cf
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Change-Id: I9e0e4bc6b9f8700d72e891d623f948db6af7d64b
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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

Change-Id: I86d1804c6ddf5072e93f3ef4f359198e732fae94
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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.

Change-Id: I8e57acbb382f072c48805f8931c464a169203512
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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

Change-Id: I71495b82a573e9f492a52dde325522a6203c06eb
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Add function TimeToTimespec for converting time.Time to Timespec.

Fixes golang/go#23078.

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Change-Id: I216a49d54bf7d9ae89a916eed0d590f786596878
Reviewed-on: https://go-review.googlesource.com/83735Reviewed-by: Ian Lance Taylor <iant@golang.org>

Add a Getsockopt variant returning a string. This can e.g. be used to
retrieve a peer's SELinux or AppArmor labels using SO_PEERSEC.

Fixes golang/go#16374

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Change-Id: I0f9bbda1053bea93b00e47a2d90f380d83c5eb16
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Change-Id: I40f99aab912c7002d113f82ccc60c9f68b9bc496
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Change-Id: I8adc5905f8c3da09b395845959def8cc580dd356
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The Utsname members are only 32 bytes on Dragonfly and the syscall
returns ENOMEM in case the value is longer than that. Like uname(3)
on Dragonfly, handle this case gracefully and just truncate the
value.

Change-Id: If617af1b6831cff6d4245f498dad9f264b8fd118
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Follow up for CL 80615

The NetBSD 8.0 builders don't seem to have these device nodes either.
Just remove them entirely.

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Fixes golang/go#16137

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