Golang fork_exec Examples

Example #1

File: proc_darwin.go Project: alexbrainman/delve

// Launch creates and begins debugging a new process. Uses a
// custom fork/exec process in order to take advantage of
// PT_SIGEXC on Darwin which will turn Unix signals into
// Mach exceptions.
func Launch(cmd []string) (*Process, error) {
	// check that the argument to Launch is an executable file
	if fi, staterr := os.Stat(cmd[0]); staterr == nil && (fi.Mode()&0111) == 0 {
		return nil, NotExecutableErr
	}

	argv0Go, err := filepath.Abs(cmd[0])
	if err != nil {
		return nil, err
	}
	// Make sure the binary exists.
	if filepath.Base(cmd[0]) == cmd[0] {
		if _, err := exec.LookPath(cmd[0]); err != nil {
			return nil, err
		}
	}
	if _, err := os.Stat(argv0Go); err != nil {
		return nil, err
	}

	argv0 := C.CString(argv0Go)
	argvSlice := make([]*C.char, 0, len(cmd)+1)
	for _, arg := range cmd {
		argvSlice = append(argvSlice, C.CString(arg))
	}
	// argv array must be null terminated.
	argvSlice = append(argvSlice, nil)

	dbp := New(0)
	var pid int
	dbp.execPtraceFunc(func() {
		ret := C.fork_exec(argv0, &argvSlice[0], C.int(len(argvSlice)),
			&dbp.os.task, &dbp.os.portSet, &dbp.os.exceptionPort,
			&dbp.os.notificationPort)
		pid = int(ret)
	})
	if pid <= 0 {
		return nil, fmt.Errorf("could not fork/exec")
	}
	dbp.Pid = pid
	for i := range argvSlice {
		C.free(unsafe.Pointer(argvSlice[i]))
	}

	dbp, err = initializeDebugProcess(dbp, argv0Go, false)
	if err != nil {
		return nil, err
	}
	err = dbp.Continue()
	return dbp, err
}

Example #2

File: proc_darwin.go Project: no2key/delve

// Create and begin debugging a new process. Uses a
// custom fork/exec process in order to take advantage of
// PT_SIGEXC on Darwin which will turn Unix signals into
// Mach exceptions.
func Launch(cmd []string) (*Process, error) {
	argv0Go, err := filepath.Abs(cmd[0])
	if err != nil {
		return nil, err
	}
	// Make sure the binary exists.
	if filepath.Base(cmd[0]) == cmd[0] {
		if _, err := exec.LookPath(cmd[0]); err != nil {
			return nil, err
		}
	}
	if _, err := os.Stat(argv0Go); err != nil {
		return nil, err
	}

	argv0 := C.CString(argv0Go)

	argvSlice := make([]*C.char, 0, len(cmd))
	for _, arg := range cmd {
		argvSlice = append(argvSlice, C.CString(arg))
	}

	var argv **C.char
	argv = &argvSlice[0]

	dbp := New(0)
	var pid int
	dbp.execPtraceFunc(func() {
		ret := C.fork_exec(argv0, argv, &dbp.os.task, &dbp.os.portSet, &dbp.os.exceptionPort, &dbp.os.notificationPort)
		pid = int(ret)
	})
	if pid <= 0 {
		return nil, fmt.Errorf("could not fork/exec")
	}
	dbp.Pid = pid
	for i := range argvSlice {
		C.free(unsafe.Pointer(argvSlice[i]))
	}

	dbp, err = initializeDebugProcess(dbp, argv0Go, false)
	if err != nil {
		return nil, err
	}
	err = dbp.Continue()
	return dbp, err
}