// amd64/v1,amd64/v2:"BSRQ","LEAQ",-"CMOVQEQ"
	// amd64/v3: "LZCNTL",- "BSRL"
	// s390x:"FLOGR"
	// arm:"CLZ" arm64:"CLZW"
	// mips:"CLZ"
	// wasm:"I64Clz"
	// ppc64x:"CNTLZW"
	return bits.LeadingZeros32(n)
}

func LeadingZeros16(n uint16) int {
	// amd64/v1,amd64/v2:"BSRL","LEAL",-"CMOVQEQ"
	// amd64/v3: "LZCNTL",- "BSRL"
	// s390x:"FLOGR"
	// arm:"CLZ" arm64:"CLZ"
	// mips:"CLZ"

// Not used on Darwin, but must be defined.
func exitThread(wait *atomic.Uint32) {
	throw("exitThread")
}

//go:nosplit
func setNonblock(fd int32) {
	flags, _ := fcntl(fd, _F_GETFL, 0)
	if flags != -1 {
		fcntl(fd, _F_SETFL, flags|_O_NONBLOCK)
	}
}

func issetugid() int32 {
	return libcCall(unsafe.Pointer(abi.FuncPCABI0(issetugid_trampoline)), nil)
}
func issetugid_trampoline()

		r0, err := unix.Fcntl(fd, syscall.F_DUPFD_CLOEXEC, 0)
		if err == nil {
			return r0, "", nil
		}
		switch err {
		case syscall.EINVAL, syscall.ENOSYS:
			// Old kernel, or js/wasm (which returns
			// ENOSYS). Fall back to the portable way from
			// now on.
			dupCloexecUnsupported.Store(true)
		default:
			return -1, "fcntl", err
		}
	}
	return dupCloseOnExecOld(fd)
}

#include <netinet/ip_mroute.h>
#include <sys/protosw.h>
#include <sys/stropts.h>
#include <sys/mman.h>
#include <sys/poll.h>
#include <sys/select.h>
#include <sys/termio.h>
#include <termios.h>
#include <fcntl.h>

#define AF_LOCAL AF_UNIX
'

includes_Darwin='
#define _DARWIN_C_SOURCE
#define KERNEL 1
#define _DARWIN_USE_64_BIT_INODE
#define __APPLE_USE_RFC_3542
#include <stdint.h>
#include <sys/attr.h>

	if len(ts) != 2 {
		return EINVAL
	}
	return utimensat(_AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
}

//sys	fcntl(fd int, cmd int, arg int) (val int, err error)

// FcntlFlock performs a fcntl syscall for the [F_GETLK], [F_SETLK] or [F_SETLKW] command.
func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error {

	osyield()
}

func kqueue() int32

//go:noescape
func kevent(kq int32, ch *keventt, nch int32, ev *keventt, nev int32, ts *timespec) int32

func pipe2(flags int32) (r, w int32, errno int32)
func fcntl(fd, cmd, arg int32) (ret int32, errno int32)

func issetugid() int32

const (
	_ESRCH     = 3
	_ETIMEDOUT = 60

	// From NetBSD's <sys/time.h>
	_CLOCK_REALTIME  = 0
	_CLOCK_VIRTUAL   = 1

func pipe2(flags int32) (r, w int32, errno int32) {
	var p [2]int32
	_, e := sysvicall2Err(&libc_pipe2, uintptr(noescape(unsafe.Pointer(&p))), uintptr(flags))
	return p[0], p[1], int32(e)
}

//go:nosplit
func fcntl(fd, cmd, arg int32) (ret int32, errno int32) {
	r1, err := sysvicall3Err(&libc_fcntl, uintptr(fd), uintptr(cmd), uintptr(arg))
	return int32(r1), int32(err)
}

func osyield1()

//go:nosplit

}

func Dup3(oldfd, newfd, flags int) error {
	if oldfd == newfd || flags&^O_CLOEXEC != 0 {
		return EINVAL
	}
	how := F_DUP2FD
	if flags&O_CLOEXEC != 0 {
		how = F_DUP2FD_CLOEXEC
	}
	_, err := fcntl(oldfd, how, newfd)
	return err
}

/*
 * Exposed directly
 */
//sys	Access(path string, mode uint32) (err error)
//sys	Adjtime(delta *Timeval, olddelta *Timeval) (err error)
//sys	CapEnter() (err error)

func fcntl(fd int, cmd int, arg int) (val int, err error) {
	r0, _, e1 := syscall(abi.FuncPCABI0(libc_fcntl_trampoline), uintptr(fd), uintptr(cmd), uintptr(arg))
	val = int(r0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

func libc_fcntl_trampoline()

//go:cgo_import_dynamic libc_fcntl fcntl "libc.so"

// Code generated by the command above; DO NOT EDIT.

//go:build aix && ppc64

package syscall

import "unsafe"

//go:cgo_import_dynamic libc_fcntl fcntl "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_Dup2 dup2 "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_pipe pipe "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_readlink readlink "libc.a/shr_64.o"