"os"
	"path/filepath"
	"syscall"
)

func access(name string) error {
	_, err := os.Lstat(name)
	return err
}

func osMkdirAll(dirPath string, perm os.FileMode, _ string) error {
	// baseDir is not honored in windows platform
	return os.MkdirAll(dirPath, perm)
}

// readDirFn applies the fn() function on each entries at dirPath, doesn't recurse into

    Operation supports folding operand(s) transposes into the operation itself.

    (1) Operation might have layout dependent operands and results...

      Example:  MaxPool(Transpose($arg, $perm))
                  -> Transpose(MaxPool($arg, $perm))

    (2) ... or it might have only layout dependent operands:

      Example: Mean(Transpose($arg, $reduction_dims))
                 -> Mean($arg, Transpose($reduction_dims))
  }];

// It returns a non-negative number of bytes written or a negative errno value.
//
//go:noescape
func write1(fd uintptr, p unsafe.Pointer, n int32) int32

//go:noescape
func open(name *byte, mode, perm int32) int32

// return value is only set on linux to be used in osinit().
func madvise(addr unsafe.Pointer, n uintptr, flags int32) int32

// exitThread terminates the current thread, writing *wait = freeMStack when

// Returns a ShapedType for a permutation and the shape of input after
// applying the permutation to the given shape through a transpose.
class GetTransposedType<string perm> : NativeCodeCall<
  "GetTransposedType($0, " # perm # ")">;

// Function to map final permutation to initial permutation
// initial -> permutation1 -> permutation2 -> final
def RemapPermutation: NativeCodeCall<"RemapPermutation($0, $1)">;

		return nil
	case EAGAIN:
		return errEAGAIN
	case EINVAL:
		return errEINVAL
	case ENOENT:
		return errENOENT
	}
	return e
}

var errnoByCode = map[string]Errno{
	"EPERM":           EPERM,
	"ENOENT":          ENOENT,
	"ESRCH":           ESRCH,
	"EINTR":           EINTR,
	"EIO":             EIO,
	"ENXIO":           ENXIO,
	"E2BIG":           E2BIG,
	"ENOEXEC":         ENOEXEC,

func Open(path string, mode int) (fd int, err error) {
	fixwd()
	return open(path, mode)
}

//sys	create(path string, mode int, perm uint32) (fd int, err error)

func Create(path string, mode int, perm uint32) (fd int, err error) {
	fixwd()
	return create(path, mode, perm)
}

//sys	remove(path string) (err error)

func Remove(path string) error {
	fixwd()
	return remove(path)
}

	_, err := fsCall("close", fd)
	return err
}

func CloseOnExec(fd int) {
	// nothing to do - no exec
}

func Mkdir(path string, perm uint32) error {
	if err := checkPath(path); err != nil {
		return err
	}
	_, err := fsCall("mkdir", path, perm)
	return err
}

func ReadDirent(fd int, buf []byte) (int, error) {
	f, err := fdToFile(fd)
	if err != nil {
		return 0, err
	}

func (sp *subpath) SafeMakeDir(subdir string, base string, perm os.FileMode) error {
	realBase, err := evalSymlink(base)
	if err != nil {
		return fmt.Errorf("error resolving symlinks in %s: %s", base, err)
	}

	realFullPath := filepath.Join(realBase, subdir)
	return doSafeMakeDir(realFullPath, realBase, perm)
}

func doSafeMakeDir(pathname string, base string, perm os.FileMode) error {

				fn   func() int
			}{
				{name: "Int31n", fn: func() int { return int(r.Int31n(int32(nfact))) }},
				{name: "int31n", fn: func() int { return int(Int31nForTest(r, int32(nfact))) }},
				{name: "Perm", fn: func() int { return encodePerm(r.Perm(n)) }},
				{name: "Shuffle", fn: func() int {
					// Generate permutation using Shuffle.
					for i := range p {
						p[i] = i
					}

func Mkdir(name string, perm FileMode) error {
	longName := fixLongPath(name)
	e := ignoringEINTR(func() error {
		return syscall.Mkdir(longName, syscallMode(perm))
	})

	if e != nil {
		return &PathError{Op: "mkdir", Path: name, Err: e}
	}

	// mkdir(2) itself won't handle the sticky bit on *BSD and Solaris
	if !supportsCreateWithStickyBit && perm&ModeSticky != 0 {
		e = setStickyBit(name)