return i
	}
	return len(n)
}

// Mmap manager, for use by operating system-specific implementations.

type mmapper struct {
	sync.Mutex
	active map[*byte][]byte // active mappings; key is last byte in mapping
	mmap   func(addr, length uintptr, prot, flags, fd int, offset int64) (uintptr, error)
	munmap func(addr uintptr, length uintptr) error
}

)

type SI struct {
	s string
	i int
}

type SS struct {
	s string
	t string
}

func main() {
	bad1 := "foo"
	bad2 := "foo"

	p := syscall.Getpagesize()
	b, err := syscall.Mmap(-1, 0, p, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
	if err != nil {
		panic(err)
	}
	err = syscall.Mprotect(b, syscall.PROT_NONE)
	if err != nil {
		panic(err)
	}

//sysnb ioctlPtr(fd int, req uint, arg unsafe.Pointer) (err error) = SYS_IOCTL

var mapper = &mmapper{
	active: make(map[*byte][]byte),
	mmap:   mmap,
	munmap: munmap,
}

func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
	return mapper.Mmap(fd, offset, length, prot, flags)
}

func Munmap(b []byte) (err error) {
	return mapper.Munmap(b)

//go:build aix && ppc64

package unix

//sysnb	Getrlimit(resource int, rlim *Rlimit) (err error)
//sys	Seek(fd int, offset int64, whence int) (off int64, err error) = lseek

//sys	mmap(addr uintptr, length uintptr, prot int, flags int, fd int, offset int64) (xaddr uintptr, err error) = mmap64

func setTimespec(sec, nsec int64) Timespec {
	return Timespec{Sec: sec, Nsec: nsec}
}

	if e1 != 0 {
		err = e1
	}
	return
}

/*
 * Map
 */

var mapper = &mmapper{
	active: make(map[*byte][]byte),
	mmap:   mmap,
	munmap: munmap,
}

//sys	mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error)
//sys	munmap(addr uintptr, length uintptr) (err error)

func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {

	return p[0], p[1], int32(err)
}

// mmap calls the mmap system call.
// We only pass the lower 32 bits of file offset to the
// assembly routine; the higher bits (if required), should be provided
// by the assembly routine as 0.
// The err result is an OS error code such as ENOMEM.
//
//go:nosplit
func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) (unsafe.Pointer, int) {

			"rand32",
			"readUnaligned32",
			"readUnaligned64",
			"releasem",
			"roundupsize",
			"stackmapdata",
			"stringStructOf",
			"subtract1",
			"subtractb",
			"tophash",
			"(*bmap).keys",
			"(*bmap).overflow",
			"(*waitq).enqueue",
			"funcInfo.entry",

			// GC-related ones
			"cgoInRange",
			"gclinkptr.ptr",
			"guintptr.ptr",
			"heapBitsSlice",
			"markBits.isMarked",

	}

	// Run to produce coverage data. Note the large argument; we need a large
	// argument (more than 4k) to trigger the bug, but the overall file
	// has to remain small (since large files will be read with mmap).
	covdir := filepath.Join(d, "covdata")
	if err = os.Mkdir(covdir, 0777); err != nil {
		t.Fatalf("creating covdir: %v", err)
	}
	large := fmt.Sprintf("%07999d", 0)
	cmd = testenv.Command(t, exepath, "1", "2", "3", large)

	//           (which only happens in case of an error) and then avoid doing
	//           the substitution (which always happens).
	if params.Len() > 0 {
		smap := makeSubstMap(tparams, targs)
		params = check.subst(nopos, params, smap, nil, check.context()).(*Tuple)
	}

	// Unify parameter and argument types for generic parameters with typed arguments

	}
	return
}
func osinit_hack_trampoline()

// mmap is used to do low-level memory allocation via mmap. Don't allow stack
// splits, since this function (used by sysAlloc) is called in a lot of low-level
// parts of the runtime and callers often assume it won't acquire any locks.
//
//go:nosplit
func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) (unsafe.Pointer, int) {