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.

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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

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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

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

Fixes golang/go#23078.

Change-Id: I685a4871d49131191f330b56b15bfd4f3131a9a5
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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.

Change-Id: Ib729574ed119f9ec78b06124ba4a5d9bbc74bf4d
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Fixes golang/go#16137

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Use /dev/ptyp* instead of /dev/ttyp* which don't seem to be available on
NetBSD 8.0+ anymore.

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The SOCK_DGRAM version of the test was introduced for 1.10, and breaks
on older versions.

Fixes golang/go#22899

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Follow the review comments by Brad in CL 79918.

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FreeBSD doesn't have a uname syscall but the information can be
retrieved using sysctls the same way as on Darwin.

Change-Id: I824c42490d1feed3f1ad3823427c01dd3e5ea3c1
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Looks like it's enough to just add wrappers pointing to the
corresponding SYS_FSTATAT{,64} or SYS_NEWFSTATAT syscall. Add a test to
verify that assumption which checks that the returned stat data matches
what is returned by Stat/Lstat.

Also add the AT_NO_AUTOMOUNT constant which may be used for the flags
parmeter.

Fixes golang/go#14216

Change-Id: I73f27b483bd97d2dcf09d4b95a7957e75d194395
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dragonfly/386 isn't a valid GOOS/GOARCH pair and there are no generated
files for this pair in x/sys/unix.

Follows CL 79675 which did the same for syscall.

Change-Id: Ie70937b464fa911a43c26515bcac1c03740dc1fe
Reviewed-on: https://go-review.googlesource.com/79676Reviewed-by: Ian Lance Taylor <iant@golang.org>

Add the same workaround as already present for 386 (CL 14151), amd64 (CL
14091) and arm64 (CL 14094) on darwin.

Fixes golang/go#22839

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testing.Run was introduced in Go 1.7. Skip the tests using it if built
with Go 1.6 or below.

Change-Id: I24c81426ea6d3eaaca5a565ad79b62b30e645d04
Reviewed-on: https://go-review.googlesource.com/78255Reviewed-by: Ian Lance Taylor <iant@golang.org>

Fixes golang/go#22801

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Change-Id: I6e587cf1b7e8532f45df03bf94e209aafe8f81fd
Reviewed-on: https://go-review.googlesource.com/78235Reviewed-by: Alex Brainman <alex.brainman@gmail.com>

Use sort.Search to look up sysctl mib values from names instead of using
a hand-crafted binary search.

Also add a simple test to verify sysctl is still working after the
change.

Change-Id: I844840ac434a704b14c3166c3730daffabd2f347
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Darwin doesn't have a uname syscall but the same information can be
retrieved using sysctls. Use the raw sysctl numbers instead of doing the
roundtrip via SysctlString in order to void the additional sysctl calls
in nametomib and SysctlRaw.

This implementation follows the one in
https://opensource.apple.com/source/Libc/Libc-1244.1.7/gen/uname.c

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PtracePeekUser was already added in CL 38638, also add its "counterpart"
allowing to modify the tracee's user area.

Change-Id: Id84e85fe17b5cab7df5ecc83b6b7b8a39241241d
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Change-Id: Id71df85e55e586b33fac66c5494291e11db8ed14
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The unexported function syscallMode was added in CL 47290 but was never
used anywhere. Remove it.

FWIW this should also fix the build failure on plan9, as the file in
question was lacking build tags.

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Re-run tip gofmt to remove empty lines before the first comment in a
block (CL 71990).

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