func (w *Writer) Write(p []byte) (n int, err error) {
	return w.pw.Write(p)
}

// Close closes the writer.
// Any accepted writes will be flushed. Any new writes will be rejected.
// Once Close() exits, files are synchronized to disk.
func (w *Writer) Close() error {
	w.pw.CloseWithError(nil)

	if w.f != nil {
		if err := w.closeCurrentFile(); err != nil {
			return err
		}
	}

	return nil
}

		// as lightweight as absolutely possible.
		// (The atomic load is free on x86 but not free elsewhere.)
		next := c.gp
		if next.ptr() == nil {
			throw("coroswitch on exited coro")
		}
		var self guintptr
		self.set(gp)
		if c.gp.cas(next, self) {
			gnext = next.ptr()
			break
		}
	}

	// Check if we're switching to ourselves. This case is able to break our

	if err != nil {
		log.Fatalf("failed to read from input pipe: %v", err)
	}

	// If the only line is the sentinel, it wasn't a crash.
	if bytes.Count(data, []byte("\n")) < 2 {
		childExitHook()
		os.Exit(0) // parent exited without crash report
	}

	log.Printf("parent reported crash:\n%s", data)

	// Parse the stack out of the crash report
	// and record a telemetry count for it.
	name, err := telemetryCounterName(data)

	RawSyscall(SYS_ERRSTR, uintptr(unsafe.Pointer(&buf[0])), uintptr(len(buf)), 0)

	buf[len(buf)-1] = 0
	return cstring(buf[:])
}

// Implemented in assembly to import from runtime.
func exit(code int)

func Exit(code int) { exit(code) }

func readnum(path string) (uint, error) {
	var b [12]byte

	fd, e := Open(path, O_RDONLY)
	if e != nil {
		return 0, e
	}
	defer Close(fd)

	n, e := Pread(fd, b[:], 0)

	)

	if pthread_attr_init(&attr) != 0 {
		writeErrStr(failthreadcreate)
		exit(1)
	}

	if pthread_attr_setstacksize(&attr, threadStackSize) != 0 {
		writeErrStr(failthreadcreate)
		exit(1)
	}

	if pthread_attr_setdetachstate(&attr, _PTHREAD_CREATE_DETACHED) != 0 {
		writeErrStr(failthreadcreate)
		exit(1)
	}

	// Disable signals during create, so that the new thread starts

}

// traceStopReadCPU blocks until the trace CPU reading goroutine exits.
//
// traceAdvanceSema must be held, and tracing must be disabled.
func traceStopReadCPU() {
	if traceEnabled() {
		throw("traceStopReadCPU called with trace enabled")
	}

	// Once we close the profbuf, we'll be in one of two situations:
	// - The logger goroutine has already exited because it observed
	//   that the trace is disabled.

	}

	return
}

type Waitmsg struct {
	Pid  int
	Time [3]uint32
	Msg  string
}

func (w Waitmsg) Exited() bool   { return true }
func (w Waitmsg) Signaled() bool { return false }

func (w Waitmsg) ExitStatus() int {
	if len(w.Msg) == 0 {
		// a normal exit returns no message
		return 0
	}
	return 1
}

//sys	await(s []byte) (n int, err error)

	}

	bufLen := len(out.buf)
	heapLen := len(out.heap)
	total := uint64(bufLen + heapLen)
	if heapLen != 0 {
		if err := out.Mmap(total); err != nil { // Mmap will copy out.heap over to out.buf
			Exitf("mapping output file failed: %v", err)
		}
	}
	return true
}

// maxOutBufHeapLen limits the growth of the heap area.
const maxOutBufHeapLen = 10 << 20