}

func Listen(fd int, backlog int) error {
	return ENOSYS
}

func Accept(fd int) (int, Sockaddr, error) {
	var newfd int32
	errno := sock_accept(int32(fd), 0, unsafe.Pointer(&newfd))
	return int(newfd), nil, errnoErr(errno)
}

func Connect(fd int, sa Sockaddr) error {
	return ENOSYS
}

func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, err error) {
	return 0, nil, ENOSYS
}

const (
	errnoERROR_IO_PENDING = 997
)

var (
	errERROR_IO_PENDING error = syscall.Errno(errnoERROR_IO_PENDING)
	errERROR_EINVAL     error = syscall.EINVAL
)

// errnoErr returns common boxed Errno values, to prevent
// allocations at runtime.
func errnoErr(e syscall.Errno) error {
	switch e {
	case 0:
		return errERROR_EINVAL
	case errnoERROR_IO_PENDING:
		return errERROR_IO_PENDING
	}

		err = errnoErr(Errno(ret))
	}
	return
}

var cgo_libc_setuid unsafe.Pointer // non-nil if cgo linked.

func Setuid(uid int) (err error) {
	if cgo_libc_setuid == nil {
		if _, _, e1 := AllThreadsSyscall(sys_SETUID, uintptr(uid), 0, 0); e1 != 0 {
			err = errnoErr(e1)
		}
	} else if ret := cgocaller(cgo_libc_setuid, uintptr(uid)); ret != 0 {
		err = errnoErr(Errno(ret))
	}

func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) (err error) {
	_, _, e1 := syscall6(uintptr(unsafe.Pointer(&libc_fcntl)), 3, uintptr(fd), uintptr(cmd), uintptr(unsafe.Pointer(lk)), 0, 0, 0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return

	if e != 0 {
		err = errnoErr(e)
	}
	return
}

func Statfs(path string, buf *Statfs_t) (err error) {
	p, err := BytePtrFromString(path)
	if err != nil {
		return err
	}
	_, _, e := Syscall(SYS_STATFS64, uintptr(unsafe.Pointer(p)), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf)))
	if e != 0 {
		err = errnoErr(e)
	}
	return
}

}

// Do the interface allocations only once for common
// Errno values.
var (
	errEAGAIN error = EAGAIN
	errEINVAL error = EINVAL
	errENOENT error = ENOENT
)

// errnoErr returns common boxed Errno values, to prevent
// allocations at runtime.
//
// We set both noinline and nosplit to reduce code size, this function has many

	if e != 0 {
		err = errnoErr(e)
	}
	return
}

func Statfs(path string, buf *Statfs_t) (err error) {
	p, err := BytePtrFromString(path)
	if err != nil {
		return err
	}
	_, _, e := Syscall(SYS_STATFS64, uintptr(unsafe.Pointer(p)), unsafe.Sizeof(*buf), uintptr(unsafe.Pointer(buf)))
	if e != 0 {
		err = errnoErr(e)
	}
	return
}

		newPos = f.pos + offset
	case 2:
		var st Stat_t
		if err := Fstat(fd, &st); err != nil {
			return 0, err
		}
		newPos = st.Size + offset
	default:
		return 0, errnoErr(EINVAL)
	}

	if newPos < 0 {
		return 0, errnoErr(EINVAL)
	}

	f.seeked = true
	f.dirIdx = 0 // Reset directory read position. See issue 35767.
	f.pos = newPos
	return newPos, nil
}

func Dup(fd int) (int, error) {

type CPUSet [cpuSetSize]cpuMask

func schedAffinity(trap uintptr, pid int, set *CPUSet) error {
	_, _, e := RawSyscall(trap, uintptr(pid), uintptr(unsafe.Sizeof(*set)), uintptr(unsafe.Pointer(set)))
	if e != 0 {
		return errnoErr(e)
	}
	return nil
}

// SchedGetaffinity gets the CPU affinity mask of the thread specified by pid.
// If pid is 0 the calling thread is used.
func SchedGetaffinity(pid int, set *CPUSet) error {

func init() {
	execveDarwin = execve
}

func fdopendir(fd int) (dir uintptr, err error) {
	r0, _, e1 := syscallPtr(abi.FuncPCABI0(libc_fdopendir_trampoline), uintptr(fd), 0, 0)
	dir = r0
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

func libc_fdopendir_trampoline()

//go:cgo_import_dynamic libc_fdopendir fdopendir "/usr/lib/libSystem.B.dylib"

func readlen(fd int, buf *byte, nbuf int) (n int, err error) {