Ejemplo n.º 1
1
// epollinit opens an epoll file descriptor and creates a pipe which will be
// used to wake up the epoll_wait(2) function. Then, file descriptor associated
// with inotify event queue and the read end of the pipe are added to epoll set.
// Note that `fd` member must be set before this function is called.
func (i *inotify) epollinit() (err error) {
	if i.epfd, err = syscall.EpollCreate1(0); err != nil {
		return
	}
	if err = syscall.Pipe(i.pipefd); err != nil {
		return
	}
	i.epes = []syscall.EpollEvent{
		{Events: syscall.EPOLLIN, Fd: i.fd},
		{Events: syscall.EPOLLIN, Fd: int32(i.pipefd[0])},
	}
	if err = syscall.EpollCtl(i.epfd, syscall.EPOLL_CTL_ADD, int(i.fd), &i.epes[0]); err != nil {
		return
	}
	return syscall.EpollCtl(i.epfd, syscall.EPOLL_CTL_ADD, i.pipefd[0], &i.epes[1])
}
Ejemplo n.º 2
0
func TestSelect(t *testing.T) {
	var p1, p2 [2]int
	mustNil(syscall.Pipe(p1[:]))
	mustNil(syscall.Pipe(p2[:]))
	fs := NewFdSet(p1[0], p2[0])
	var maxfd int
	if p1[0] > p2[0] {
		maxfd = p1[0] + 1
	} else {
		maxfd = p2[0] + 1
	}
	go func() {
		syscall.Write(p1[1], []byte("to p1"))
		syscall.Write(p2[1], []byte("to p2"))
		syscall.Close(p1[1])
		syscall.Close(p2[1])
	}()
	e := Select(maxfd+1, fs, nil, nil, nil)
	if e != nil {
		t.Errorf("Select(%v, %v, nil, nil, nil) => %v, want <nil>",
			maxfd+1, fs, e)
	}
	syscall.Close(p1[0])
	syscall.Close(p2[0])
}
Ejemplo n.º 3
0
func (sc *selectCtx) Init() error {
	sc.rset.Zero()
	sc.wset.Zero()
	sc.fdmax = -1
	// Create and configure the pipe-ends.
	b := make([]int, 2)
	err := syscall.Pipe(b)
	if err != nil {
		return err
	}
	sc.pfdr, sc.pfdw = b[0], b[1]
	syscall.CloseOnExec(sc.pfdr)
	syscall.CloseOnExec(sc.pfdw)
	err = syscall.SetNonblock(sc.pfdr, true)
	if err != nil {
		syscall.Close(sc.pfdr)
		syscall.Close(sc.pfdw)
		return err
	}
	err = syscall.SetNonblock(sc.pfdw, true)
	if err != nil {
		syscall.Close(sc.pfdr)
		syscall.Close(sc.pfdw)
		return err
	}
	// pfdr (read-end of pipe) is set (and remains set forever) on
	// rset.
	sc.rset.Set(sc.pfdr)
	sc.fdmax = sc.pfdr
	// allocate dummy selectCtx.{b,b1} buffers.
	sc.b = make([]byte, 1)
	sc.b1 = make([]byte, 128)
	return nil
}
Ejemplo n.º 4
0
Archivo: gtk.go Proyecto: jwilkins/pond
func NewGTKUI() *GTKUI {
	gtk.Init(nil)
	window := gtk.Window(gtk.GTK_WINDOW_TOPLEVEL)
	window.SetPosition(gtk.GTK_WIN_POS_CENTER)
	window.SetTitle("Pond")
	window.SetDefaultSize(1000, 800)

	ui := &GTKUI{
		window:  window,
		actions: make(chan interface{}, uiActionsQueueLen),
		events:  make(chan interface{}, 8),
	}
	window.Connect("destroy", func(ctx *glib.CallbackContext) {
		close(ui.events)
		for {
			if _, ok := <-ui.actions; !ok {
				break
			}
		}
		gtk.MainQuit()
	})
	if err := syscall.Pipe(ui.pipe[:]); err != nil {
		panic(err)
	}
	syscall.SetNonblock(ui.pipe[0], true)

	glib.FdWatchAdd(ui.pipe[0], glib.IOIn, func(conditions int) bool {
		ui.onAction()
		return true
	})

	return ui
}
Ejemplo n.º 5
0
func main() {
	fd := make([]int, 2)
	if err := syscall.Pipe(fd); err != nil {
		log.Fatal("Socketpair:", err)
	}
	defer syscall.Close(fd[0])
	defer syscall.Close(fd[1])
	name := fmt.Sprintf("/proc/%d/fd/%d", os.Getpid(), fd[1])
	fmt.Println(name)

	cmd := exec.Command("ubertooth-btle", "-f", "-d", name)
	if err := cmd.Start(); err != nil {
		log.Fatal(err)
	}

	f := os.NewFile(uintptr(fd[0]), "server")
	buf := make([]byte, 1024)
	for {
		n, err := f.Read(buf)
		if err == io.EOF {
			break
		}
		if err != nil {
			log.Fatal(err)
		}
		fmt.Printf("%q\n", buf[:n])
	}
}
Ejemplo n.º 6
0
func makeTestFd(t *testing.T) testFd {
	var tfd testFd
	errno := syscall.Pipe(tfd[:])
	if errno != nil {
		t.Fatalf("Failed to create pipe: %v", errno)
	}
	return tfd
}
Ejemplo n.º 7
0
// Pipe returns a connected pair of Files; reads from r return bytes
// written to w. It returns the files and an error, if any.
func Pipe() (r *File, w *File, err error) {
	var p [2]int

	if e := syscall.Pipe(p[0:]); e != nil {
		return nil, nil, NewSyscallError("pipe", e)
	}

	return NewFile(uintptr(p[0]), "|0"), NewFile(uintptr(p[1]), "|1"), nil
}
Ejemplo n.º 8
0
// Try to open a pipe with O_CLOEXEC set on both file descriptors.
func forkExecPipe(p []int) error {
	err := syscall.Pipe(p)
	if err != nil {
		return err
	}
	_, err = fcntl(p[0], syscall.F_SETFD, syscall.FD_CLOEXEC)
	if err != nil {
		return err
	}
	_, err = fcntl(p[1], syscall.F_SETFD, syscall.FD_CLOEXEC)
	return err
}
Ejemplo n.º 9
0
// Pipe returns a connected pair of Files; reads from r return bytes
// written to w. It returns the files and an error, if any.
func Pipe() (r *File, w *File, err error) {
	var p [2]int

	syscall.ForkLock.RLock()
	if e := syscall.Pipe(p[0:]); e != nil {
		syscall.ForkLock.RUnlock()
		return nil, nil, NewSyscallError("pipe", e)
	}
	syscall.ForkLock.RUnlock()

	return NewFile(uintptr(p[0]), "|0"), NewFile(uintptr(p[1]), "|1"), nil
}
Ejemplo n.º 10
0
func Pipe() (r *File, w *File, err Error) {
	var p [2]int

	syscall.ForkLock.RLock()
	if e := syscall.Pipe(p[0:]); iserror(e) {
		syscall.ForkLock.RUnlock()
		return nil, nil, NewSyscallError("pipe", e)
	}
	syscall.ForkLock.RUnlock()

	return NewFile(p[0], "|0"), NewFile(p[1], "|1"), nil
}
Ejemplo n.º 11
0
// launchQemu run qemu and wait it's quit, includes
func launchQemu(ctx *VmContext) {
	qemu, err := exec.LookPath("qemu-system-x86_64")
	if err != nil {
		ctx.hub <- &QemuExitEvent{message: "can not find qemu executable"}
		return
	}

	args := ctx.QemuArguments()

	if glog.V(1) {
		glog.Info("cmdline arguments: ", strings.Join(args, " "))
	}

	go waitConsoleOutput(ctx)

	pipe := make([]int, 2)
	err = syscall.Pipe(pipe)
	if err != nil {
		glog.Error("fail to create pipe")
		ctx.hub <- &QemuExitEvent{message: "fail to create pipe"}
		return
	}

	err = daemon(qemu, append([]string{"qemu-system-x86_64"}, args...), pipe[1])
	if err != nil {
		//fail to daemonize
		glog.Error("try to start qemu failed")
		ctx.hub <- &QemuExitEvent{message: "try to start qemu failed"}
		return
	}

	buf := make([]byte, 4)
	nr, err := syscall.Read(pipe[0], buf)
	if err != nil || nr != 4 {
		glog.Error("try to start qemu failed")
		ctx.hub <- &QemuExitEvent{message: "try to start qemu failed"}
		return
	}
	syscall.Close(pipe[1])
	syscall.Close(pipe[0])

	pid := binary.BigEndian.Uint32(buf[:nr])
	glog.V(1).Infof("starting daemon with pid: %d", pid)

	err = ctx.watchPid(int(pid))
	if err != nil {
		glog.Error("watch qemu process failed")
		ctx.hub <- &QemuExitEvent{message: "watch qemu process failed"}
		return
	}
}
Ejemplo n.º 12
0
func (s *Splicer) splice(direction string, inFD, outFD int, wg *sync.WaitGroup) {
	// Signal to the caller that we're done
	defer func() {
		// If a reliable delivery socket has data associated with it when a close takes place, the system continues to attempt data transfer.
		if err := syscall.Shutdown(inFD, SHUT_RDWR); err != nil {
			log.Printf("Shutdown err %v", err)
		}
		if err := syscall.Shutdown(outFD, SHUT_RDWR); err != nil {
			log.Printf("Shutdown err %v", err)
		}
		if wg != nil {
			wg.Done()
		}
	}()

	pipe := make([]int, 2)
	if err := syscall.Pipe(pipe); err != nil {
		log.Fatal(err)
	}
	defer func() {
		syscall.Close(pipe[0])
		syscall.Close(pipe[1])
	}()

	var netWrittenBytes, netReadBytes int64
	log.Printf("[%v] Splicing pipe %+v, tcpfds %+v", direction, s.pipe, s.tcpFD)
	for {
		// SPLICE_F_NONBLOCK: don't block if TCP buffer is empty
		// SPLICE_F_MOVE: directly move pages into splice buffer in kernel memory
		// SPLICE_F_MORE: just makes mysql connections slow
		log.Printf("[input (%v)] Entering input", direction)
		inBytes, err := syscall.Splice(inFD, nil, pipe[1], nil, s.bufferSize, SPLICE_F_NONBLOCK)
		if err := s.checkSpliceErr(inBytes, err, fmt.Sprintf("input (%v)", direction)); err != nil {
			log.Printf("ERROR [input (%v)] error: %v", direction, err)
			return
		}
		netReadBytes += inBytes
		log.Printf("[input (%v)] %d bytes read", direction, inBytes)

		log.Printf("[input (%v)] Entering output", direction)
		outBytes, err := syscall.Splice(pipe[0], nil, outFD, nil, s.bufferSize, SPLICE_F_NONBLOCK)
		if err := s.checkSpliceErr(inBytes, err, fmt.Sprintf("output (%v)", direction)); err != nil {
			log.Printf("ERROR [output (%v)] error: %v", direction, err)
			return
		}
		log.Printf("[output (%v)] %d bytes written, out of given input %d", direction, outBytes, inBytes)
		netWrittenBytes += outBytes
	}
	log.Printf("[%v] Spliced %d bytes read %d bytes written", direction, netWrittenBytes, netReadBytes)
}
Ejemplo n.º 13
0
// init initializes kqueue.
func (k *kqueue) init() (err error) {
	if k.fd, err = syscall.Kqueue(); err != nil {
		return
	}
	// Creates pipe used to stop `Kevent` call by registering it,
	// watching read end and writing to other end of it.
	if err = syscall.Pipe(k.pipefds[:]); err != nil {
		return
	}
	var kevn [1]syscall.Kevent_t
	syscall.SetKevent(&kevn[0], k.pipefds[0], syscall.EVFILT_READ, syscall.EV_ADD)
	_, err = syscall.Kevent(k.fd, kevn[:], nil, nil)
	return
}
Ejemplo n.º 14
0
// launchQemu run qemu and wait it's quit, includes
func launchQemu(qc *QemuContext, ctx *hypervisor.VmContext) {
	qemu := qc.driver.executable
	if qemu == "" {
		ctx.Hub <- &hypervisor.VmStartFailEvent{Message: "can not find qemu executable"}
		return
	}

	args := qc.arguments(ctx)

	if glog.V(1) {
		glog.Info("cmdline arguments: ", strings.Join(args, " "))
	}

	pipe := make([]int, 2)
	err := syscall.Pipe(pipe)
	if err != nil {
		glog.Error("fail to create pipe")
		ctx.Hub <- &hypervisor.VmStartFailEvent{Message: "fail to create pipe"}
		return
	}

	err = daemon(qemu, append([]string{"qemu-system-x86_64"}, args...), pipe[1])
	if err != nil {
		//fail to daemonize
		glog.Error("try to start qemu failed")
		ctx.Hub <- &hypervisor.VmStartFailEvent{Message: "try to start qemu failed"}
		return
	}

	buf := make([]byte, 4)
	nr, err := syscall.Read(pipe[0], buf)
	if err != nil || nr != 4 {
		glog.Error("try to start qemu failed")
		ctx.Hub <- &hypervisor.VmStartFailEvent{Message: "try to start qemu failed"}
		return
	}
	syscall.Close(pipe[1])
	syscall.Close(pipe[0])

	pid := binary.BigEndian.Uint32(buf[:nr])
	glog.V(1).Infof("starting daemon with pid: %d", pid)

	err = ctx.DCtx.(*QemuContext).watchPid(int(pid), ctx.Hub)
	if err != nil {
		glog.Error("watch qemu process failed")
		ctx.Hub <- &hypervisor.VmStartFailEvent{Message: "watch qemu process failed"}
		return
	}
}
Ejemplo n.º 15
0
func ext۰os۰Pipe(fr *frame, args []value) value {
	// func os.Pipe() (r *File, w *File, err error)

	// The portable POSIX pipe(2) call is good enough for our needs.
	var p [2]int
	if err := syscall.Pipe(p[:]); err != nil {
		// TODO(adonovan): fix: return an *os.SyscallError.
		return tuple{nil, nil, wrapError(err)}
	}

	NewFile := fr.i.prog.ImportedPackage("os").Func("NewFile")
	r := call(fr.i, fr, 0, NewFile, []value{uintptr(p[0]), "|0"})
	w := call(fr.i, fr, 0, NewFile, []value{uintptr(p[1]), "|1"})
	return tuple{r, w, wrapError(nil)}
}
Ejemplo n.º 16
0
func (k *PosixKernel) Pipe(files co.Buf) uint64 {
	var fds [2]int
	err := syscall.Pipe(fds[:])
	if err == nil {
		st := files.Struc()
		err := st.Pack(int32(fds[0]))
		if err == nil {
			err = st.Pack(int32(fds[1]))
		}
		if err != nil {
			return UINT64_MAX // FIXME
		}
	}
	return Errno(err)
}
Ejemplo n.º 17
0
// Pipe returns a connected pair of Files; reads from r return bytes written to w.
// It returns the files and an error, if any.
func Pipe() (r *File, w *File, err error) {
	var p [2]syscall.Handle

	// See ../syscall/exec.go for description of lock.
	syscall.ForkLock.RLock()
	e := syscall.Pipe(p[0:])
	if e != nil {
		syscall.ForkLock.RUnlock()
		return nil, nil, NewSyscallError("pipe", e)
	}
	syscall.CloseOnExec(p[0])
	syscall.CloseOnExec(p[1])
	syscall.ForkLock.RUnlock()

	return NewFile(uintptr(p[0]), "|0"), NewFile(uintptr(p[1]), "|1"), nil
}
Ejemplo n.º 18
0
// Pipe returns a connected pair of Files; reads from r return bytes written to w.
// It returns the files and an Error, if any.
func Pipe() (r *File, w *File, err Error) {
	var p [2]int

	// See ../syscall/exec.go for description of lock.
	syscall.ForkLock.RLock()
	e := syscall.Pipe(&p)
	if e != 0 {
		syscall.ForkLock.RUnlock()
		return nil, nil, NewSyscallError("pipe", e)
	}
	syscall.CloseOnExec(p[0])
	syscall.CloseOnExec(p[1])
	syscall.ForkLock.RUnlock()

	return NewFile(p[0], "|0"), NewFile(p[1], "|1"), nil
}
Ejemplo n.º 19
0
func TestGetSetNonblock(t *testing.T) {
	var p [2]int
	mustNil(syscall.Pipe(p[:]))
	for _, b := range []bool{true, false} {
		if e := SetNonblock(p[0], b); e != nil {
			t.Errorf("SetNonblock(%v, %v) => %v, want <nil>", p[0], b, e)
		}
		if nb, e := GetNonblock(p[0]); nb != b || e != nil {
			t.Errorf("GetNonblock(%v) => (%v, %v), want (%v, <nil>)", p[0], nb, e, b)
		}
	}
	syscall.Close(p[0])
	syscall.Close(p[1])
	if e := SetNonblock(p[0], true); e == nil {
		t.Errorf("SetNonblock(%v, true) => <nil>, want non-<nil>", p[0])
	}
}
Ejemplo n.º 20
0
Archivo: conn.go Proyecto: 9nut/plan9
func NewSrvConn(srvname string) (net.Conn, error) {
	var pip [2]int

	err := syscall.Pipe(pip[:])
	if err != nil {
		return nil, err
	}
	srvfile, err := PostFD(srvname, pip[1])
	if err != nil {
		syscall.Close(pip[0])
		syscall.Close(pip[1])
		return nil, err
	}
	syscall.Close(pip[1])
	f := os.NewFile(uintptr(pip[0]), "|0")

	return &SrvConn{Name: srvname, SrvFile: srvfile, file: f}, nil
}
Ejemplo n.º 21
0
func main() {
	log.Printf("Input file %v", *inFile)
	in, err := os.Open(*inFile)
	if err != nil {
		log.Fatal(err)
	}
	defer in.Close()
	inFD := int(in.Fd())

	log.Printf("Output file %v", *outFile)
	out, err := os.Create(*outFile)
	if err != nil {
		log.Fatal(err)
	}
	defer out.Close()
	outFD := int(out.Fd())

	pipe := make([]int, 2)
	if err := syscall.Pipe(pipe); err != nil {
		log.Fatal(err)
	}
	defer syscall.Close(pipe[0])
	defer syscall.Close(pipe[1])

	flags := SPLICE_F_NONBLOCK
	blockSize := 1
	inFileSize := fileSize(in)
	var netRead int64

	for {
		inBytes, err := syscall.Splice(inFD, nil, pipe[1], nil, blockSize, flags)
		checkSpliceErr(inBytes, err, "input")
		netRead += inBytes
		log.Printf("[input] %d bytes read, %d remaining", inBytes, inFileSize-netRead)

		if err := syscall.SetNonblock(inFD, true); err != nil {
			log.Fatalf("Unable to close in fd")
		}

		outBytes, err := syscall.Splice(pipe[0], nil, outFD, nil, blockSize, flags)
		checkSpliceErr(outBytes, err, "output")
		log.Printf("[output] %d bytes written, out of given input %d", outBytes, inBytes)
	}
}
Ejemplo n.º 22
0
// Pipe returns a connected pair of Files; reads from
// r return bytes written to w. It returns the files and an error, if any.
// Optionally, r or w might be set to non-blocking mode using the appropriate
// flags. To obtain a blocking pipe just pass 0 as the flag.
func Pipe(flag PipeFlag) (r *os.File, w *os.File, err error) {
	var p [2]int

	syscall.ForkLock.RLock()
	if err := syscall.Pipe(p[:]); err != nil {
		syscall.ForkLock.RUnlock()
		return nil, nil, os.NewSyscallError("pipe", err)
	}
	syscall.CloseOnExec(p[0])
	syscall.CloseOnExec(p[1])
	if flag&ReadNonBlock != 0 {
		syscall.SetNonblock(p[0], true)
	}
	if flag&WriteNonBlock != 0 {
		syscall.SetNonblock(p[1], true)
	}
	syscall.ForkLock.RUnlock()

	return os.NewFile(uintptr(p[0]), "|0"), os.NewFile(uintptr(p[1]), "|1"), nil
}
Ejemplo n.º 23
0
Archivo: libgo2.go Proyecto: gmwu/go
func init() {
	var p [2]int
	if e := syscall.Pipe(p[0:]); e != nil {
		fmt.Fprintf(os.Stderr, "pipe: %v\n", e)
		os.Exit(2)
	}

	if e := dup2(p[0], fd); e != nil {
		fmt.Fprintf(os.Stderr, "dup2: %v\n", e)
		os.Exit(2)
	}

	const str = "PASS"
	if n, e := syscall.Write(p[1], []byte(str)); e != nil || n != len(str) {
		fmt.Fprintf(os.Stderr, "write: %d %v\n", n, e)
		os.Exit(2)
	}

	if e := syscall.Close(p[1]); e != nil {
		fmt.Fprintf(os.Stderr, "close: %v\n", e)
		os.Exit(2)
	}
}
Ejemplo n.º 24
0
// Pipe returns a connected pair of Files; reads from r return bytes written to w.
// It returns the files and an error, if any.
func Pipe() (r *File, w *File, err error) {
	var p [2]int

	e := syscall.Pipe2(p[0:], syscall.O_CLOEXEC)
	// pipe2 was added in 2.6.27 and our minimum requirement is 2.6.23, so it
	// might not be implemented.
	if e == syscall.ENOSYS {
		// See ../syscall/exec.go for description of lock.
		syscall.ForkLock.RLock()
		e = syscall.Pipe(p[0:])
		if e != nil {
			syscall.ForkLock.RUnlock()
			return nil, nil, NewSyscallError("pipe", e)
		}
		syscall.CloseOnExec(p[0])
		syscall.CloseOnExec(p[1])
		syscall.ForkLock.RUnlock()
	} else if e != nil {
		return nil, nil, NewSyscallError("pipe2", e)
	}

	return NewFile(uintptr(p[0]), "|0"), NewFile(uintptr(p[1]), "|1"), nil
}
Ejemplo n.º 25
0
func (port InputPort) Connect(source Source) (portConnection, error) {
	fd := make([]int, 2)

	syscall.Pipe(fd)

	readFd := fd[0]
	writeFd := C.int(fd[1])
	port.writeFds = append(port.writeFds, &writeFd)

	C.MIDIPortConnectSource(port.port, source.endpoint, unsafe.Pointer(&writeFd))

	go func() {
		dataForLength := make([]byte, 1)

		for {
			n, err := syscall.Read(readFd, dataForLength)
			if err != nil || n != 1 {
				break
			}

			length := dataForLength[0]
			data := make([]byte, length)

			n, err = syscall.Read(readFd, data)
			if err != nil || n != int(length) {
				break
			}

			port.readProc(source, data)
		}

		syscall.Close(readFd)
	}()

	return portConnection{port, source, &writeFd}, nil
}
Ejemplo n.º 26
0
func runFunction(m *llgo.Module, name string) (output []string, err error) {
	addExterns(m)
	err = addRuntime(m)
	if err != nil {
		return
	}

	err = llvm.VerifyModule(m.Module, llvm.ReturnStatusAction)
	if err != nil {
		return
	}

	engine, err := llvm.NewJITCompiler(m.Module, 0)
	if err != nil {
		return
	}
	defer engine.Dispose()

	fn := engine.FindFunction(name)
	if fn.IsNil() {
		err = fmt.Errorf("Couldn't find function '%s'", name)
		return
	}

	// Redirect stdout to a pipe.
	pipe_fds := make([]int, 2)
	err = syscall.Pipe(pipe_fds)
	if err != nil {
		return
	}
	defer syscall.Close(pipe_fds[0])
	defer syscall.Close(pipe_fds[1])
	old_stdout, err := syscall.Dup(syscall.Stdout)
	if err != nil {
		return
	}
	defer syscall.Close(old_stdout)
	err = syscall.Dup2(pipe_fds[1], syscall.Stdout)
	if err != nil {
		return
	}
	defer syscall.Dup2(old_stdout, syscall.Stdout)

	c := make(chan string)
	go readPipe(pipe_fds[0], c)

	exec_args := []llvm.GenericValue{}
	engine.RunStaticConstructors()
	engine.RunFunction(fn, exec_args)
	defer engine.RunStaticDestructors()

	// Call fflush to flush stdio (printf), then sync and close the write
	// end of the pipe.
	fflush := engine.FindFunction("fflush")
	ptr0 := unsafe.Pointer(uintptr(0))
	exec_args = []llvm.GenericValue{llvm.NewGenericValueFromPointer(ptr0)}
	engine.RunFunction(fflush, exec_args)
	syscall.Fsync(pipe_fds[1])
	syscall.Close(pipe_fds[1])
	syscall.Close(syscall.Stdout)

	output_str := <-c
	output = strings.Split(strings.TrimSpace(output_str), "\n")
	return
}
Ejemplo n.º 27
0
func runMainFunction(m *llgo.Module) (output []string, err error) {
	addExterns(m)
	err = addRuntime(m)
	if err != nil {
		return
	}

	err = llvm.VerifyModule(m.Module, llvm.ReturnStatusAction)
	if err != nil {
		err = fmt.Errorf("Verification failed: %v", err)
		return
	}

	engine, err := llvm.NewExecutionEngine(m.Module)
	if err != nil {
		return
	}
	defer engine.Dispose()

	fn := engine.FindFunction("main")
	if fn.IsNil() {
		err = fmt.Errorf("Couldn't find function 'main'")
		return
	}

	// Redirect stdout to a pipe.
	pipe_fds := make([]int, 2)
	err = syscall.Pipe(pipe_fds)
	if err != nil {
		return
	}
	defer syscall.Close(pipe_fds[0])
	defer syscall.Close(pipe_fds[1])
	old_stdout, err := syscall.Dup(syscall.Stdout)
	if err != nil {
		return
	}
	defer syscall.Close(old_stdout)
	err = syscall.Dup2(pipe_fds[1], syscall.Stdout)
	if err != nil {
		return
	}
	defer syscall.Dup2(old_stdout, syscall.Stdout)

	c := make(chan string)
	go readPipe(pipe_fds[0], c)

	// FIXME implement and use RunFunctionAsMain
	argv0 := []byte("llgo-test\000")
	var envs [1]*byte
	argv0ptr := &argv0
	exec_args := []llvm.GenericValue{
		llvm.NewGenericValueFromInt(llvm.Int32Type(), 1, true),
		llvm.NewGenericValueFromPointer(unsafe.Pointer(&argv0ptr)),
		llvm.NewGenericValueFromPointer(unsafe.Pointer(&envs)),
	}
	engine.RunStaticConstructors()
	engine.RunFunction(fn, exec_args)
	defer engine.RunStaticDestructors()

	// Call fflush to flush stdio (printf), then sync and close the write
	// end of the pipe.
	fflush := engine.FindFunction("fflush")
	ptr0 := unsafe.Pointer(uintptr(0))
	exec_args = []llvm.GenericValue{llvm.NewGenericValueFromPointer(ptr0)}
	engine.RunFunction(fflush, exec_args)
	syscall.Fsync(pipe_fds[1])
	syscall.Close(pipe_fds[1])
	syscall.Close(syscall.Stdout)

	output_str := <-c
	output = strings.Split(strings.TrimSpace(output_str), "\n")
	return
}