[]int{4, 2, 1, 3, 0},                // Perm(5)
	[]int{0, 2, 3, 1, 5, 4, 6, 7},       // Perm(8)
	[]int{2, 0, 8, 3, 4, 7, 6, 5, 1},    // Perm(9)
	[]int{0, 6, 5, 3, 8, 4, 1, 2, 9, 7}, // Perm(10)
	[]int{9, 14, 4, 11, 13, 8, 0, 6, 2, 12, 3, 7, 1, 10, 5, 15}, // Perm(16)
	[]int{},                             // Perm(0)
	[]int{0},                            // Perm(1)
	[]int{2, 4, 0, 3, 1},                // Perm(5)

// license that can be found in the LICENSE file.

//go:build unix

package runtime

const canCreateFile = true

// create returns an fd to a write-only file.
func create(name *byte, perm int32) int32 {
	return open(name, _O_CREAT|_O_WRONLY|_O_TRUNC, perm)

	cSpaceString   = `(?:\s+(\S+))?`
	cSpaceHex      = `(?:\s+([[:xdigit:]]+))?`
	cSpaceAtOffset = `(?:\s+\(@([[:xdigit:]]+)\))?`
	cPerm          = `(?:\s+([-rwxp]+))?`

	procMapsRE  = regexp.MustCompile(`^` + cHexRange + cPerm + cSpaceHex + hexPair + spaceDigits + cSpaceString)
	briefMapsRE = regexp.MustCompile(`^` + cHexRange + cPerm + cSpaceString + cSpaceAtOffset + cSpaceHex)

	// Regular expression to parse log data, of the form:
	// ... file:line] msg...

	Open(name string) (*os.File, error)
	OpenFile(name string, flag int, perm os.FileMode) (*os.File, error)
	Rename(oldpath, newpath string) error
}

// RealOS is used to dispatch the real system level operations.
type RealOS struct{}

// MkdirAll will call os.MkdirAll to create a directory.
func (RealOS) MkdirAll(path string, perm os.FileMode) error {
	return os.MkdirAll(path, perm)
}

// Symlink will call os.Symlink to create a symbolic link.

	var errno syscall.Errno
	if errors.As(err, &errno) {
		switch errno {
		case syscall.EPERM, syscall.EROFS:
			// User lacks permission: either the call requires root permission and the
			// user is not root, or the call is denied by a container security policy.
			return true
		case syscall.EINVAL:
			// Some containers return EINVAL instead of EPERM if a system call is
			// denied by security policy.
			return true
		}
	}

	show("Int32N(10)", r.Int32N(10), r.Int32N(10), r.Int32N(10))
	show("Int64N(10)", r.Int64N(10), r.Int64N(10), r.Int64N(10))

	// Perm generates a random permutation of the numbers [0, n).
	show("Perm", r.Perm(5), r.Perm(5), r.Perm(5))
	// Output:
	// Float32     0.95955694          0.8076733            0.8135684
	// Float64     0.4297927436037299  0.797802349388613    0.3883664855410056

		for len(suffix) > 0 && suffix[0] == filepath.Separator {
			suffix = suffix[1:]
		}
		dstPath := filepath.Join(dstRoot, suffix)

		perm := info.Mode() & os.ModePerm
		if info.Mode()&os.ModeSymlink != 0 {
			info, err = os.Stat(srcPath)
			if err != nil {
				return err
			}
			perm = info.Mode() & os.ModePerm
		}

		// Always copy directories (don't symlink them).

	_ "unsafe" // for linkname
)

func Unlinkat(dirfd int, path string, flags int) error {
	return unlinkat(dirfd, path, flags)
}

func Openat(dirfd int, path string, flags int, perm uint32) (int, error) {
	return openat(dirfd, path, flags, perm)
}

func Fstatat(dirfd int, path string, stat *syscall.Stat_t, flags int) error {
	return fstatat(dirfd, path, stat, flags)
}

//go:linkname unlinkat syscall.unlinkat

	VADDUDM	V16, V6, V6
	VADDUDM	V17, V7, V7

	CMPU	INP, END
	BLT	loop

#ifdef GOARCH_ppc64le
	VPERM	V0, V1, KI, V0
	VPERM	V2, V3, KI, V2
	VPERM	V4, V5, KI, V4
	VPERM	V6, V7, KI, V6
#else
	VPERM	V1, V0, KI, V0
	VPERM	V3, V2, KI, V2
	VPERM	V5, V4, KI, V4
	VPERM	V7, V6, KI, V6
#endif
	STXVD2X	VS32, (CTX+R_x000)	// v0 = vs32
	STXVD2X	VS34, (CTX+R_x010)	// v2 = vs34

#define NEEDS_ESPERM
#define P8_LXVB16X(RA,RB,VT) \
	LXVD2X	(RA+RB), VT \
	VPERM	VT, VT, ESPERM, VT

#define P8_STXVB16X(VS,RA,RB) \
	VPERM	VS, VS, ESPERM, TMP2 \
	STXVD2X	TMP2, (RA+RB)

#define XXBRD_ON_LE(VA,VT) \
	VPERM	VA, VA, ESPERM, VT

#  endif // defined(GOPPC64_power9)
#else
#define P8_LXVB16X(RA,RB,VT)  LXVD2X	(RA+RB), VT