The `RtlInitUnicodeString` syscall can be avoided by manually
initializing the `NTUnicodeString`.

The process is described in [WdmlibRtlInitUnicodeStringEx](https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/wdmsec/nf-wdmsec-wdmlibrtlinitunicodestringex).

The less syscalls, the better. It also makes the function faster:

```
goos: windows
goarch: amd64
pkg: golang.org/x/sys/windows
cpu: Intel(R) Core(TM) i7-10850H CPU @ 2.70GHz
                      │    old.txt    │               new.txt                │
                      │    sec/op     │    sec/op     vs base                │
NewNTUnicodeString-12   181.05n ± 15%   96.32n ± 11%  -46.80% (p=0.000 n=10)
```

Change-Id: Iaf079acdcc2024cdca6b6b649a711f6be99c5b87
Reviewed-on: https://go-review.googlesource.com/c/sys/+/618175
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Reviewed-by: Cherry Mui <cherryyz@google.com>
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The syscall clock_settime(3) is used to set the time on the specified
clock. It is a counterpart to clock_gettime(3) which is already
exposed as ClockGettime here.

Fixes golang/go#69830

Change-Id: I6145c915754f31e3c50f6a11568eb9d5ba12a778
GitHub-Last-Rev: 5b15f12
GitHub-Pull-Request: #221
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The function fetches ethtool timestamping and PHC association for a
network interface. Its primary usage is to query the mapping between
the interface and its corresponding PTP clock number in /dev/ptp𝑛.

Change-Id: Id09466b3b43056c628593d4d2e05d77ec8d8082b
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Change-Id: I55aef760145df773be30d567c9e989f46a3e79dc
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ubuntu 24.04 introduced support for qemu-loongarch64, and ubuntu 24.10
introduced support for the cross-compiler gcc-loongarch64-linux-gnu, so
we can temporarily switch to ubuntu 24.10 to discard the extra links
introduced by loong64 and switch to it when the next ubuntu LTS version
is released.

Change-Id: I96de123df0cf50d6ba0331eeb02fc1e8c48ce304
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Add the ioctls to get/set the hardware timestamping configuration
(SIOCSHWTSTAMP and SIOCGHWTSTAMP) along with relevant symbols.

The usage is described in
https://www.kernel.org/doc/Documentation/networking/timestamping.txt

Change-Id: Ib7509feaf28218aeae497eff9ca6c0a532aa73c0
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…{6,9,12,15}

Replace syscall.Syscall6, Syscall9, Syscall12, and Syscall15 with syscall.SyscallN for Go 1.18+. This simplifies system calls by allowing the exact number of arguments needed, eliminating zero padding and reducing potential errors.

Updated TestSyscallXGeneration to TestSyscallNGeneration to verify correct SyscallN generation for different argument counts.

Change-Id: Icd6662b591d7548e367b88f34243f5529e177eab
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The IOCTLs are used for interacting with PTP-specific functions of NIC and time card drivers.

Description:
https://netdevconf.info/0x18/docs/netdev-0x18-paper39-talk-slides/netdev-intro-ptp-api.pdf

Change-Id: If50d605958e5cee451146cf68cc95a3704917512
GitHub-Last-Rev: 44fac1c
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These represent valid values for PtpPinDesc.Func.
They are defined as enum, thus not emitted from mkerrors.sh.

Change-Id: Ibac22d56214fa0f64a4095dfc000692a5e5e994a
GitHub-Last-Rev: e7990b0
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Change-Id: Ibcd776913317d3b38b418190fa93c6eae52ffc0d
Reviewed-on: https://go-review.googlesource.com/c/sys/+/621955
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This fixes the following warnings emitted when running mkall.sh on
GOOS=linux with a recent Docker version:

 6 warnings found (use --debug to expand):
 - LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format (line 4)
 - LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format (line 24)
 - LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format (line 25)
 - LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format (line 26)
 - LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format (line 33)
 - LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format (line 56)

Also see https://docs.docker.com/reference/build-checks/legacy-key-value-format/

Change-Id: Icdf05cbe7b8650fc2fec84e010c7401807f5f75f
Reviewed-on: https://go-review.googlesource.com/c/sys/+/621956
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- Add a wrapper function around fcntl to handle different operation
  types and new fcntl implementation that accepts uintptr as an arg.
- Add support for calling mmap/munmap with address pointers.
- Add accompanying tests for new functions.

Change-Id: If5e77aa4cf2cccfd431de4f3bd0c5014a761e167
GitHub-Last-Rev: 07e32a4
GitHub-Pull-Request: #216
Reviewed-on: https://go-review.googlesource.com/c/sys/+/610296
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Also remove a few unhelpful blank lines.

Change-Id: I4001a25ec409406855b7800afd88738c43f60b90
Reviewed-on: https://go-review.googlesource.com/c/sys/+/621921
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Ftruncate can be implemented on Windows using a single syscall. This
makes the implementation more efficient and less prone to races when
used in combination with other Seek calls.

Note that this is the x/sys counterpart for CL 618835.

Change-Id: Ie9be356bd953ccce85c0dd87a5dcc6ccf4fec464
Reviewed-on: https://go-review.googlesource.com/c/sys/+/621935
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This makes it easier to distinguish them from the IFLA_* and add new
entries. Also refresh the IFLA_* consts while at it.

Change-Id: I94aa56c9f99d0714668d8150cb6185d57e2d789c
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extend support for z/OS target by adding the following syscalls:
- Sendfile (library implementation)
- Fcntl
- MmapPtr
- MunmapPtr

Change-Id: I098748802c2b275c15758e9d0132fca0490e9b70
GitHub-Last-Rev: 5aafd0b
GitHub-Pull-Request: #223
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These days people will just import the packages and the go tool will
do the right thing. We don't need to explain it.

Add a pointer to the git repo, though.

For golang/go#62645

Change-Id: I94cd9c588a68d92c61d00be05740248509a2ae6e
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Darwin opmask clobbering bug was fixed in kernel version 21.3.0
as released in MacOS 12.2.0. This commit resolves issue by
checking for Darwin AVX512 support via a sysctl call with the
addition of a kernel minimum version check.

The kernel version check is completed without adding new
dependencies to x/sys/cpu. A sysctl call is accomplished by
copying a minimal amount of code from x/sys/unix, to retrieve
only the needed KERN_OSRELEASE value. This code is structured
in the same manner as an existing analogous AIX/PPC64 syscall.

The resulting dotted version string value is then parsed for
numeric comparison with a dependency free function.

All code in this contribution is structured to ease removal of
the special darwin/amd64 codepaths when that OS/arch combination
is eventually no longer supported by golang.

Resolves issue: golang/go#49233, reinstates fix for issue: golang/go#43089

Change-Id: I4755fc8b3865eb6562b0959ecc910e2c46ac6cb4
Reviewed-on: https://go-review.googlesource.com/c/sys/+/620256
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
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The NotifyIpInterfaceChange and NotifyUnicastIpAddressChange functions
register a user-defined callback function for receiving network
interface and IP address change notifications. The GetIfEntry2Ex and
GetUnicastIpAddressEntry functions can be called to retrieve complete
information about the changed interface or address.

The CancelMibChangeNotify2 function deregisters for change
notifications.

Change-Id: Iee29405ffa135c6aa0120f9aa046e3706e2bac47
GitHub-Last-Rev: a8309cd
GitHub-Pull-Request: #211
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….Syscall{6,9,12,15}"

This reverts CL 614082.

Reason for revert: syscall.SyscallN allocates more than its syscall.SyscallX counterparts, producing perf-related test failures across the board.

Updates #70197

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