// skipping the test altogether.
	if runtime.GOOS != "wasip1" {
		syscall.Kill(syscall.Getpid(), syscall.SIGCHLD)
	}
}

func open(name string) (uintptr, error) {
	fd, err := syscall.Open(name, syscall.O_RDONLY, 0)
	if err != nil {
		return 0, err
	}
	return uintptr(fd), nil
}

func read(fd uintptr, buf []byte) (int, error) {
	return syscall.Read(int(fd), buf)
}

func closefd(fd uintptr) {

//go:systemstack
func initHPETTimecounter(idx int) {
	const digits = "0123456789"

	var devPath [len(hpetDevPath)]byte
	copy(devPath[:], hpetDevPath)
	devPath[9] = digits[idx]

	fd := open(&devPath[0], 0 /* O_RDONLY */ |_O_CLOEXEC, 0)
	if fd < 0 {
		atomic.Casuintptr(&hpetDevMap[idx], 0, ^uintptr(0))
		return
	}

	addr, mmapErr := mmap(nil, physPageSize, _PROT_READ, _MAP_SHARED, fd, 0)
	closefd(fd)
	newP := uintptr(addr)

	dir := t.TempDir()

	h, err := syscall.Open(dir, syscall.O_RDONLY, 0)
	if err != nil {
		t.Fatalf("Open failed: %v", err)
	}
	syscall.CloseHandle(h)
	h, err = syscall.Open(dir, syscall.O_RDONLY|syscall.O_TRUNC, 0)
	if err == nil {
		t.Error("Open should have failed")
	} else {
		syscall.CloseHandle(h)
	}
	h, err = syscall.Open(dir, syscall.O_RDONLY|syscall.O_CREAT, 0)
	if err == nil {

// acquire a write lock.
func TryLockedOpenFile(path string, flag int, perm os.FileMode) (*LockedFile, error) {
	var lockType uint32 = lockFileFailImmediately | lockFileExclusiveLock
	if flag == syscall.O_RDONLY {
		// https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-lockfileex
		//lint:ignore SA4016 Reasons
		lockType = lockFileFailImmediately // Set this to enable shared lock and fail immediately.
	}

		name := filepath.Join(dir, strconv.Itoa(i))
		if err := syscall.Mkfifo(name, 0o600); err != nil {
			t.Fatal(err)
		}
		// The problem only occurs if we use O_NONBLOCK here.
		rd, err := os.OpenFile(name, os.O_RDONLY|syscall.O_NONBLOCK, 0o600)
		if err != nil {
			t.Fatal(err)
		}
		wr, err := os.OpenFile(name, os.O_WRONLY|syscall.O_NONBLOCK, 0o600)
		if err != nil {
			t.Fatal(err)
		}
		const msg = "message"

//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package ioutil

import "os"

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

import (
	"os"
)

var (
	// No special option for reads on windows
	readMode = os.O_RDONLY

	// Write with sync no buffering only used only for `xl.meta` writes
	writeMode = os.O_SYNC

	"syscall"
)

// for testing: whatever interrupts a sleep
func interrupt() {
	// cannot predict pid, don't want to kill group
}

func open(name string) (uintptr, error) {
	fd, err := syscall.Open(name, syscall.O_RDONLY)
	if err != nil {
		return 0, err
	}
	return uintptr(fd), nil
}

func read(fd uintptr, buf []byte) (int, error) {
	return syscall.Read(int(fd), buf)
}

func closefd(fd uintptr) {

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

import (
	"os"
)

var (
	// Disallow updating access times
	readMode = os.O_RDONLY | 0x40000 // O_NOATIME

	// Write with data sync only used only for `xl.meta` writes
	writeMode = 0x1000 // O_DSYNC

	// calls for Linux and Windows anyway, so it's simpler to use that approach
	// consistently.

	f, err := os.OpenFile(name, flag&^os.O_TRUNC, perm)
	if err != nil {
		return nil, err
	}

	switch flag & (os.O_RDONLY | os.O_WRONLY | os.O_RDWR) {
	case os.O_WRONLY, os.O_RDWR:
		err = filelock.Lock(f)
	default:
		err = filelock.RLock(f)
	}
	if err != nil {
		f.Close()
		return nil, err
	}