Future OpenBSD releases will remove the syscall(2) interface.
This converts the Fcntl functions to use fcntl(2) from libc,
rather than indirectly through syscall(2).

Updates golang/go#63900.

Change-Id: I50c3b91cb40245653c772e65b0b15c625974bebe
GitHub-Last-Rev: 9c62104
GitHub-Pull-Request: #179
Reviewed-on: https://go-review.googlesource.com/c/sys/+/538995
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Joel Sing <joel@sing.id.au>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>

The fchmodat2 syscall was added in Linux kernel 6.6. Use it in Fchmodat
if flags are given. It will return ENOSYS on older kernels (or EINVAL or
any other bogus error in some container implementations).

Fixes golang/go#61636

Change-Id: Ibbc9a08733b7186907b2fe5837cb997446c38357
Reviewed-on: https://go-review.googlesource.com/c/sys/+/539635
Reviewed-by: Heschi Kreinick <heschi@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>

This re-adds BPF_F_KPROBE_MULTI_RETURN which was removed by CL 538378
because it was changed from a #define to an enum in the upstream bpf.h
header, see
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c5487f8d9186

Fixes golang/go#63969

Change-Id: Icbf180d8fb8d51fd2fa4a29a615f7071abda9a8b
Reviewed-on: https://go-review.googlesource.com/c/sys/+/540395
Reviewed-by: Heschi Kreinick <heschi@google.com>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>

Fixes golang/go#63217

Change-Id: Ia1b0ae88b7e7a7c611067a0b30e454b66f45ce51
Reviewed-on: https://go-review.googlesource.com/c/sys/+/530897
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Heschi Kreinick <heschi@google.com>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>

Per https://learn.microsoft.com/en-us/windows/win32/api/libloaderapi/nf-libloaderapi-adddlldirectory
and https://learn.microsoft.com/en-us/windows/win32/api/libloaderapi/nf-libloaderapi-removedlldirectory.

Change-Id: If44a3758720345d1bbd9af96ec2481fbe9398a08
Reviewed-on: https://go-review.googlesource.com/c/sys/+/537755
Reviewed-by: Tatiana Bradley <tatianabradley@google.com>
Auto-Submit: Roland Shoemaker <roland@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

LOOP_CONFIGURE ioctl is used to setup and configure all loop device
parameters in a single step.
Add to the unix package a new function that exposes LOOP_CONFIGURE.

Fixes golang/go#63962

Change-Id: Ia169d268b52b1384febc6bff9c707b721ab2bb24
GitHub-Last-Rev: f9cc4c9
GitHub-Pull-Request: #181
Reviewed-on: https://go-review.googlesource.com/c/sys/+/540075
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

Fixes golang/go#64426

Change-Id: I7332f73e27396d187ed63715100af299a949eaf9
GitHub-Last-Rev: a6b267b
GitHub-Pull-Request: #182
Reviewed-on: https://go-review.googlesource.com/c/sys/+/545495
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Mauri de Souza Meneguzzo <mauri870@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>

These newlines are written by mksyscall.go but should not appear in the final
generated files once the output is passed through gofmt.  This is done by
mkall.sh but I had written a custom script just to generate these openbsd
zsyscall files in CL 468095.

Running the mksyscall.go output through gofmt fixes this issue.

Fixes golang/go#64820

Change-Id: I1b1bf55145bd5a5208e091ded24a973f953c479f
GitHub-Last-Rev: 514272b
GitHub-Pull-Request: #183
Reviewed-on: https://go-review.googlesource.com/c/sys/+/551715
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Run-TryBot: Jorropo <jorropo.pgm@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

These are all present in glibc 2.37 which is currently used to generate
these constants.

Change-Id: I3ffbd8f8581e85e8854222ad3f2c7f44aac106c7
Reviewed-on: https://go-review.googlesource.com/c/sys/+/552417
Reviewed-by: David Chase <drchase@google.com>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Matt Layher <mdlayher@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Than McIntosh <thanm@google.com>

Fixes golang/go#61834

Change-Id: Iaff01f5662aa2309e8ac41b346e0d3a42d28af91
Reviewed-on: https://go-review.googlesource.com/c/sys/+/517575
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>