defer func() {
		TestHookDidSendFile(fd, 0, written, err, written > 0)
	}()
	if fd.kind == kindPipe {
		// TransmitFile does not work with pipes
		return 0, syscall.ESPIPE
	}
	if ft, _ := syscall.GetFileType(src); ft == syscall.FILE_TYPE_PIPE {
		return 0, syscall.ESPIPE
	}

	if err := fd.writeLock(); err != nil {
		return 0, err
	}
	defer fd.writeUnlock()

	o := &fd.wop
	o.handle = src

	// Plan 9 system messages. Invented to support
	// what package os and others expect.
	EACCES       = NewError("access permission denied")
	EAFNOSUPPORT = NewError("address family not supported by protocol")
	ESPIPE       = NewError("illegal seek")
)

// Notes
const (
	SIGABRT = Note("abort")
	SIGALRM = Note("alarm")
	SIGHUP  = Note("hangup")
	SIGINT  = Note("interrupt")
	SIGKILL = Note("kill")

	EPERM           Errno = 63
	EPIPE           Errno = 64
	EPROTO          Errno = 65
	EPROTONOSUPPORT Errno = 66
	EPROTOTYPE      Errno = 67
	ERANGE          Errno = 68
	EROFS           Errno = 69
	ESPIPE          Errno = 70
	ESRCH           Errno = 71
	ESTALE          Errno = 72
	ETIMEDOUT       Errno = 73
	ETXTBSY         Errno = 74
	EXDEV           Errno = 75
	ENOTCAPABLE     Errno = 76

	EOWNERDEAD
	EPERM
	EPFNOSUPPORT
	EPIPE
	EPROTO
	EPROTONOSUPPORT
	EPROTOTYPE
	ERANGE
	EREMCHG
	EREMOTE
	EREMOTEIO
	ERESTART
	EROFS
	ESHUTDOWN
	ESOCKTNOSUPPORT
	ESPIPE
	ESRCH
	ESRMNT
	ESTALE
	ESTRPIPE
	ETIME
	ETIMEDOUT
	ETOOMANYREFS
	ETXTBSY
	EUCLEAN
	EUNATCH
	EUSERS
	EWOULDBLOCK
	EXDEV
	EXFULL
	EWINDOWS
)

	"EISDIR":          EISDIR,
	"EINVAL":          EINVAL,
	"ENFILE":          ENFILE,
	"EMFILE":          EMFILE,
	"ENOTTY":          ENOTTY,
	"EFBIG":           EFBIG,
	"ENOSPC":          ENOSPC,
	"ESPIPE":          ESPIPE,
	"EROFS":           EROFS,
	"EMLINK":          EMLINK,
	"EPIPE":           EPIPE,
	"ENAMETOOLONG":    ENAMETOOLONG,
	"ENOSYS":          ENOSYS,
	"EDQUOT":          EDQUOT,
	"EDOM":            EDOM,

	EROFS           = syscall.Errno(0x1e)
	ESAD            = syscall.Errno(0x71)
	ESHUTDOWN       = syscall.Errno(0x4d)
	ESOCKTNOSUPPORT = syscall.Errno(0x3f)
	ESOFT           = syscall.Errno(0x6f)
	ESPIPE          = syscall.Errno(0x1d)
	ESRCH           = syscall.Errno(0x3)
	ESTALE          = syscall.Errno(0x34)
	ESYSERROR       = syscall.Errno(0x5a)
	ETIME           = syscall.Errno(0x77)

	return i, nil
}

// Pread emulates the Unix pread system call.
func (fd *FD) Pread(b []byte, off int64) (int, error) {
	if fd.kind == kindPipe {
		// Pread does not work with pipes
		return 0, syscall.ESPIPE
	}
	// Call incref, not readLock, because since pread specifies the
	// offset it is independent from other reads.
	if err := fd.incref(); err != nil {
		return 0, err
	}
	defer fd.decref()

	EROFS           = syscall.Errno(0x1e)
	ESAD            = syscall.Errno(0x71)
	ESHUTDOWN       = syscall.Errno(0x4d)
	ESOCKTNOSUPPORT = syscall.Errno(0x3f)
	ESOFT           = syscall.Errno(0x6f)
	ESPIPE          = syscall.Errno(0x1d)
	ESRCH           = syscall.Errno(0x3)
	ESTALE          = syscall.Errno(0x34)
	ESYSERROR       = syscall.Errno(0x5a)
	ETIME           = syscall.Errno(0x77)

	EREMOTE         = syscall.Errno(0x42)
	ERESTART        = syscall.Errno(0x5b)
	EROFS           = syscall.Errno(0x1e)
	ESHUTDOWN       = syscall.Errno(0x8f)
	ESOCKTNOSUPPORT = syscall.Errno(0x79)
	ESPIPE          = syscall.Errno(0x1d)
	ESRCH           = syscall.Errno(0x3)
	ESRMNT          = syscall.Errno(0x45)
	ESTALE          = syscall.Errno(0x97)
	ESTRPIPE        = syscall.Errno(0x5c)

	EREMOTE         = syscall.Errno(0x47)
	EROFS           = syscall.Errno(0x1e)
	ERPCMISMATCH    = syscall.Errno(0x49)
	ESHUTDOWN       = syscall.Errno(0x3a)
	ESOCKTNOSUPPORT = syscall.Errno(0x2c)
	ESPIPE          = syscall.Errno(0x1d)
	ESRCH           = syscall.Errno(0x3)
	ESTALE          = syscall.Errno(0x46)
	ETIMEDOUT       = syscall.Errno(0x3c)
	ETOOMANYREFS    = syscall.Errno(0x3b)