// Open HID by vendorId, productId and serialNumber.
// SerialNumber is optional and can be empty string ("").
// Returns a *Devica and an error.
func Open(vendorId uint16, productId uint16, serialNumber string) (*Device, error) {
var err error
// call hidInit(). hidInit() checks if actual call to hid_hidInit() is required.
if err = hidInit(); err != nil {
return nil, err
}
// serialNumberWchar value. Default nil.
serialNumberWcharPtr := (*C.wchar_t)(nil)
// if a serialNumber is given, create a WcharString and set the pointer to it's first position pointer
if len(serialNumber) > 0 {
serialNumberWchar, err := wchar.FromGoString(serialNumber)
if err != nil {
return nil, errors.New("Unable to convert serialNumber to WcharString")
}
serialNumberWcharPtr = (*C.wchar_t)(unsafe.Pointer(serialNumberWchar.Pointer()))
}
// call hid_open()
hidHandle := C.hid_open(C.ushort(vendorId), C.ushort(productId), serialNumberWcharPtr)
if hidHandle == nil {
return nil, errors.New("Unable to open device.")
}
dev := &Device{
hidHandle: hidHandle,
}
// done
return dev, nil
}
// SetColorTemp changes the Xrandr colors to reflect the specified color temperature.
func SetColorTemp(temp int) {
dpy := C.XOpenDisplay(nil)
screenCount := C.screenCount(dpy)
for screen := C.int(0); screen < screenCount; screen++ {
root := C.RootWindowMacro(dpy, screen)
res := C.XRRGetScreenResourcesCurrent(dpy, root)
if temp < 1000 || temp > 10000 {
temp = 6500
}
temp -= 1000
ratio := float64((temp-1000)%500) / 500.0
point := whitepoints[temp/500]
gammar := point.r*(1-ratio) + point.r*ratio
gammag := point.g*(1-ratio) + point.g*ratio
gammab := point.b*(1-ratio) + point.b*ratio
for c := C.int(0); c < res.ncrtc; c++ {
crtcxid := C.crtcxid(res.crtcs, c)
size := C.XRRGetCrtcGammaSize(dpy, crtcxid)
crtc_gamma := C.XRRAllocGamma(size)
for i := C.int(0); i < size; i++ {
g := 65535.0 * float64(i) / float64(size)
C.ushortSet(crtc_gamma.red, i, C.ushort(g*gammar))
C.ushortSet(crtc_gamma.green, i, C.ushort(g*gammag))
C.ushortSet(crtc_gamma.blue, i, C.ushort(g*gammab))
}
C.XRRSetCrtcGamma(dpy, crtcxid, crtc_gamma)
C.XFree(unsafe.Pointer(crtc_gamma))
}
}
}
func (t *pty) open(cols, rows int) error {
var winp = new(C.struct_winsize)
winp.ws_col = C.ushort(cols)
winp.ws_row = C.ushort(rows)
winp.ws_xpixel = 0
winp.ws_ypixel = 0
var master, slave C.int
var name = make([]C.char, 40)
if ret := int(C.GoOpenpty(&master, &slave, &name[0], winp)); ret == -1 {
return errors.New("openpty(3) failed")
}
t.master = int(master)
t.slave = int(slave)
t.pty = C.GoString(&name[0])
if err := syscall.SetNonblock(t.master, true); err != nil {
return err
}
if err := syscall.SetNonblock(t.slave, true); err != nil {
return err
}
return nil
}
func makeCWindowSize(sz *WindowSize) C.struct_winsize {
var winsize C.struct_winsize
winsize.ws_row = C.ushort(sz.Rows)
winsize.ws_col = C.ushort(sz.Cols)
winsize.ws_xpixel = C.ushort(sz.PixelWidth)
winsize.ws_ypixel = C.ushort(sz.PixelHeight)
return winsize
}
// Retrieve a list of DeviceInfo objects that match the given vendorId and productId.
// To retrieve a list of all HID devices': use 0x0 as vendorId and productId.
func Enumerate(vendorId uint16, productId uint16) (DeviceInfoList, error) {
var err error
// call C.hid_enumerate with given parameters
first := C.hid_enumerate(C.ushort(vendorId), C.ushort(productId))
// check for failure
if first == nil {
return nil, errors.New("Could not enumerate devices. Failure.")
}
// defer free-ing first
defer C.hid_free_enumeration(first)
// make DeviceInfoList to fill
dil := make(DeviceInfoList, 0)
// loop over linked list to fill DeviceInfoList
for next := first; next != nil; next = next.next {
// create DeviceInfo instance from next hid_device_info
di := &DeviceInfo{
Path: C.GoString(next.path),
VendorId: uint16(next.vendor_id),
ProductId: uint16(next.product_id),
ReleaseNumber: uint16(next.release_number),
UsagePage: uint16(next.usage_page),
Usage: uint16(next.usage),
InterfaceNumber: int(next.interface_number),
}
// get and convert serial_number from next hid_device_info
di.SerialNumber, err = wchar.WcharStringPtrToGoString(unsafe.Pointer(next.serial_number))
if err != nil {
log.Println("Error converting the Serial Number, setting to empty string")
di.SerialNumber = ""
}
// get and convert manufacturer_string from next hid_device_info
di.Manufacturer, err = wchar.WcharStringPtrToGoString(unsafe.Pointer(next.manufacturer_string))
if err != nil {
log.Println("Error converting the Manufacturer, setting to empty string")
di.Manufacturer = ""
}
// get and convert product_string from next hid_device_info
di.Product, err = wchar.WcharStringPtrToGoString(unsafe.Pointer(next.product_string))
if err != nil {
return nil, fmt.Errorf("Could not convert *C.wchar_t product_string from hid_device_info to go string. Error: %s\n", err)
}
// store di in dil
dil = append(dil, di)
}
// all done
return dil, nil
}
func ffi_type_make(size int, alignment int, typ CType,
elements **C.ffi_type) C.ffi_type {
csize := C.size_t(size)
calign := C.ushort(alignment)
ctype := C.ushort(typ)
celem := (**_Cstruct__ffi_type)(elements)
return C.ffi_type{csize, calign, ctype, celem}
}
func (s *Sheet) getInfo(i int, handle unsafe.Pointer) error {
var name *C.char
var numRow C.uint
var numCol C.ushort
ret := C.freexl_get_worksheet_name(handle, C.ushort(i), &name)
if ret != OK {
return fmt.Errorf("Freexl: error get sheet name :%d", ret)
}
s.Name = C.GoString(name)
ret = C.freexl_select_active_worksheet(handle, C.ushort(i))
if ret != OK {
return fmt.Errorf("Freexl: failed to selct worksheet: %s", ret)
}
ret = C.freexl_worksheet_dimensions(handle, &numRow, &numCol)
if ret != OK {
return fmt.Errorf("Freexl: failed to get dimensions: %s", ret)
}
s.MaxRow = int(numRow)
s.MaxCol = int(numCol)
s.Values = make([][]string, s.MaxRow)
for i, row := range s.Values {
row = make([]string, s.MaxCol)
var cell C.FreeXL_CellValue
for j := range row {
ret = C.freexl_get_cell_value(handle, C.uint(i), C.ushort(j), &cell)
if ret != OK {
continue
}
switch C.freexl_cell_get_type(cell) {
case CELL_DOUBLE:
row[j] = fmt.Sprintf("%1.12f", float64(C.freexl_cell_get_double_value(cell)))
case CELL_INT:
row[j] = fmt.Sprintf("%d", int(C.freexl_cell_get_int_value(cell)))
case CELL_TEXT, CELL_SST_TEXT, CELL_DATE, CELL_DATETIME, CELL_TIME:
row[j] = C.GoString(C.freexl_cell_get_text_value(cell))
default:
fallthrough
case CELL_NULL:
row[j] = ""
}
}
s.Values[i] = row
}
return nil
}
func (this *GammaRamp) toPtr() (ptr *C.GLFWgammaramp) {
size := C.size_t(unsafe.Sizeof(ptr))
ptr = (*C.GLFWgammaramp)(C.malloc(size))
for i := 0; i < GammaRampSize; i++ {
ptr.red[i] = C.ushort(this.Red[i])
ptr.green[i] = C.ushort(this.Green[i])
ptr.blue[i] = C.ushort(this.Blue[i])
}
return
}
func (t *pty) resize(cols, rows int) error {
var winp = new(C.struct_winsize)
winp.ws_col = C.ushort(cols)
winp.ws_row = C.ushort(rows)
winp.ws_xpixel = 0
winp.ws_ypixel = 0
if ret := int(C.GoResize(C.int(t.fd), winp)); ret == -1 {
return errors.New("ioctl(2) failed")
}
return nil
}
//SetGammaRamp sets the current gamma ramp for the monitor.
func (m *Monitor) SetGammaRamp(ramp *GammaRamp) {
var rampC C.GLFWgammaramp
length := len(ramp.Red)
for i := 0; i < length; i++ {
C.SetGammaAtIndex(rampC.red, C.int(i), C.ushort(ramp.Red[i]))
C.SetGammaAtIndex(rampC.green, C.int(i), C.ushort(ramp.Green[i]))
C.SetGammaAtIndex(rampC.blue, C.int(i), C.ushort(ramp.Blue[i]))
}
C.glfwSetGammaRamp(m.data, &rampC)
}
func (z *zeroconf) addPrinter(name string, port uint16, ty, url, id string, online bool) error {
r := record{
name: C.CString(name),
port: port,
ty: ty,
url: url,
id: id,
online: online,
}
z.spMutex.Lock()
defer z.spMutex.Unlock()
if _, exists := z.printers[name]; exists {
return fmt.Errorf("printer %s was already added to Avahi publishing", name)
}
if z.state == C.AVAHI_CLIENT_S_RUNNING {
txt := prepareTXT(ty, url, id, online)
defer C.avahi_string_list_free(txt)
C.avahi_threaded_poll_lock(z.threadedPoll)
defer C.avahi_threaded_poll_unlock(z.threadedPoll)
if errstr := C.addAvahiGroup(z.threadedPoll, z.client, &r.group, r.name, C.ushort(r.port), txt); errstr != nil {
err := fmt.Errorf("Failed to add Avahi group: %s", C.GoString(errstr))
return err
}
}
z.printers[name] = r
return nil
}
func (s *Shout) updateParameters() {
// set hostname
p := C.CString(s.Host)
C.shout_set_host(s.struc, p)
C.free(unsafe.Pointer(p))
// set port
C.shout_set_port(s.struc, C.ushort(s.Port))
// set username
p = C.CString(s.User)
C.shout_set_user(s.struc, p)
C.free(unsafe.Pointer(p))
// set password
p = C.CString(s.Password)
C.shout_set_password(s.struc, p)
C.free(unsafe.Pointer(p))
// set mount point
p = C.CString(s.Mount)
C.shout_set_mount(s.struc, p)
C.free(unsafe.Pointer(p))
// set format
C.shout_set_format(s.struc, C.uint(s.Format))
// set protocol
C.shout_set_protocol(s.struc, C.uint(s.Protocol))
}
// WaitZero adds and operation that will block until a semaphore's number is 0.
func (so *SemOps) WaitZero(num uint16, flags *SemOpFlags) error {
*so = append(*so, C.struct_sembuf{
sem_num: C.ushort(num),
sem_op: C.short(0),
sem_flg: C.short(flags.flags()),
})
return nil
}
func (f *Freexl) getInfo(t int) (int, error) {
var info C.uint
ret := C.freexl_get_info(f.handle, C.ushort(t), &info)
if ret != OK {
return 0, fmt.Errorf("Freexl: error get info %d: %d", t, ret)
}
return int(info), nil
}
// ConstDefined checks if the given constant is defined in the scope.
//
// This should be used, for example, before a call to Class, because a
// failure in Class will crash your program (by design). You can retrieve
// the Value of a Class by calling Value().
func (m *Mrb) ConstDefined(name string, scope Value) bool {
cs := C.CString(name)
defer C.free(unsafe.Pointer(cs))
scopeV := scope.MrbValue(m).value
b := C.mrb_const_defined(
m.state, scopeV, C.mrb_intern_cstr(m.state, cs))
return C.ushort(b) != 0
}
func (t *pty) fork(file string, args, env []string, cwd string, cols, rows, uid, gid int) error {
var winp = new(C.struct_winsize)
winp.ws_col = C.ushort(cols)
winp.ws_row = C.ushort(rows)
winp.ws_xpixel = 0
winp.ws_ypixel = 0
//fork the pty
var master C.int = -1
var name []C.char = make([]C.char, 40)
var pid C.int = C.GoForkpty(&master, &name[0], winp)
t.fd = int(master)
t.pid = int(pid)
t.pty = C.GoString(&name[0])
switch t.pid {
case -1:
return errors.New("forkpty(3) failed")
case 0:
if cwd != "" {
if err := syscall.Chdir(cwd); err != nil {
panic("chdir failed")
}
}
if uid != -1 && gid != -1 {
if err := syscall.Setgid(gid); err != nil {
panic("setgid failed")
}
if err := syscall.Setuid(uid); err != nil {
panic("setuid failed")
}
}
syscall.Exec(file, args, env)
panic("exec failed")
}
return nil
}
func Get(device string, width uint16, height uint16) []byte {
deviceName := C.CString(device)
defer C.free(unsafe.Pointer(deviceName))
// 80K ought to be enough for anybody :)
buffer := unsafe.Pointer(C.calloc(80000, 1))
defer C.free(buffer)
bufSize := C.camsnap_shot(deviceName, C.ushort(width), C.ushort(height), (*C.byte)(buffer))
var arrayptr = uintptr(buffer)
var rawBytes = make([]byte, bufSize)
for i := 0; i < len(rawBytes); i++ {
rawBytes[i] = byte(*(*C.byte)(unsafe.Pointer(arrayptr)))
arrayptr++
}
return rawBytes
}
// handleClientStateChange makes clean transitions as the connection with
// avahi-daemon changes.
//export handleClientStateChange
func handleClientStateChange(client *C.AvahiClient, newState C.AvahiClientState, userdata unsafe.Pointer) {
z := instance
z.spMutex.Lock()
defer z.spMutex.Unlock()
// Name conflict.
if newState == C.AVAHI_CLIENT_S_COLLISION {
log.Warning("Avahi reports a host name collision.")
}
// Transition from not connecting to connecting. Warn in logs.
if newState == C.AVAHI_CLIENT_CONNECTING {
log.Warning("Cannot find Avahi daemon. Is it running?")
}
// Transition from running to not running. Free all groups.
if newState != C.AVAHI_CLIENT_S_RUNNING {
log.Info("Local printing disabled (Avahi client is not running).")
for name, r := range z.printers {
if r.group != nil {
if errstr := C.removeAvahiGroup(z.threadedPoll, r.group); errstr != nil {
err := errors.New(C.GoString(errstr))
log.Errorf("Failed to remove Avahi group: %s", err)
}
r.group = nil
z.printers[name] = r
}
}
}
// Transition from not running to running. Recreate all groups.
if newState == C.AVAHI_CLIENT_S_RUNNING {
log.Info("Local printing enabled (Avahi client is running).")
for name, r := range z.printers {
txt := prepareTXT(r.ty, r.url, r.id, r.online)
defer C.avahi_string_list_free(txt)
if errstr := C.addAvahiGroup(z.threadedPoll, z.client, &r.group, r.name, C.ushort(r.port), txt); errstr != nil {
err := errors.New(C.GoString(errstr))
log.Errorf("Failed to add Avahi group: %s", err)
}
z.printers[name] = r
}
}
// Transition from not failure to failure. Recreate thread poll and client.
if newState == C.AVAHI_CLIENT_FAILURE {
z.restart <- struct{}{}
}
z.state = newState
}
// Decrement adds an operation that will decrease a semaphore's number.
func (so *SemOps) Decrement(num uint16, by int16, flags *SemOpFlags) error {
if by <= 0 {
return errors.New("sysvipc: by must be >0. use WaitZero or Increment")
}
*so = append(*so, C.struct_sembuf{
sem_num: C.ushort(num),
sem_op: C.short(-by),
sem_flg: C.short(flags.flags()),
})
return nil
}
// Set updates parameters of the semaphore set.
func (ss *SemaphoreSet) Set(ssi *SemSetInfo) error {
sds := &C.struct_semid_ds{
sem_perm: C.struct_ipc_perm{
uid: C.__uid_t(ssi.Perms.OwnerUID),
gid: C.__gid_t(ssi.Perms.OwnerGID),
mode: C.ushort(ssi.Perms.Mode & 0x1FF),
},
}
rc, err := C.semctl_buf(C.int(ss.id), C.IPC_SET, sds)
if rc == -1 {
return err
}
return nil
}
// Set updates parameters of the shared memory segment.
func (shm *SharedMem) Set(info *SHMInfo) error {
shmds := &C.struct_shmid_ds{
shm_perm: C.struct_ipc_perm{
uid: C.__uid_t(info.Perms.OwnerUID),
gid: C.__gid_t(info.Perms.OwnerGID),
mode: C.ushort(info.Perms.Mode & 0x1FF),
},
}
rc, err := C.shmctl(C.int(shm.id), C.IPC_SET, shmds)
if rc == -1 {
return err
}
return nil
}
// Set updates parameters of the queue.
func (mq MessageQueue) Set(mqi *MQInfo) error {
mqds := &C.struct_msqid_ds{
msg_perm: C.struct_ipc_perm{
uid: C.__uid_t(mqi.Perms.OwnerUID),
gid: C.__gid_t(mqi.Perms.OwnerGID),
mode: C.ushort(mqi.Perms.Mode & 0x1FF),
},
msg_qbytes: C.msglen_t(mqi.MaxBytes),
}
rc, err := C.msgctl(C.int(mq), C.IPC_SET, mqds)
if rc == -1 {
return err
}
return nil
}
// Setall sets the values of every semaphore in the set
func (ss *SemaphoreSet) Setall(values []uint16) error {
if uint(len(values)) != ss.count {
return errors.New("sysvipc: wrong number of values for Setall")
}
carr := make([]C.ushort, ss.count)
for i, val := range values {
carr[i] = C.ushort(val)
}
rc, err := C.semctl_arr(C.int(ss.id), C.SETALL, &carr[0])
if rc == -1 {
return err
}
return nil
}
func (z *zeroconf) addPrinter(name string, port uint16, ty, url, id string, online bool) error {
r := record{
name: C.CString(name),
port: port,
ty: ty,
url: url,
id: id,
online: online,
}
z.spMutex.Lock()
defer z.spMutex.Unlock()
if _, exists := z.printers[name]; exists {
return fmt.Errorf("printer %s was already added to Avahi publishing", name)
}
if z.state == C.AVAHI_CLIENT_S_RUNNING {
tyC := C.CString(ty)
defer C.free(unsafe.Pointer(tyC))
urlC := C.CString(url)
defer C.free(unsafe.Pointer(urlC))
idC := C.CString(id)
defer C.free(unsafe.Pointer(idC))
var onlineC *C.char
if online {
onlineC = C.CString("online")
} else {
onlineC = C.CString("offline")
}
defer C.free(unsafe.Pointer(onlineC))
C.avahi_threaded_poll_lock(z.threadedPoll)
defer C.avahi_threaded_poll_unlock(z.threadedPoll)
var errstr *C.char
C.addAvahiGroup(z.threadedPoll, z.client, &r.group, r.name, C.ushort(port),
tyC, urlC, idC, onlineC, &errstr)
if errstr != nil {
err := errors.New(C.GoString(errstr))
C.free(unsafe.Pointer(errstr))
return err
}
}
z.printers[name] = r
return nil
}
// Initialize GoTypes in NumTypeMap
func initTypeMap() {
cgoNumMap["C.char"] = GetNumInfo(C.char(0))
cgoNumMap["C.schar"] = GetNumInfo(C.schar(0))
cgoNumMap["C.uchar"] = GetNumInfo(C.uchar(0))
cgoNumMap["C.short"] = GetNumInfo(C.short(0))
cgoNumMap["C.ushort"] = GetNumInfo(C.ushort(0))
cgoNumMap["C.wchar_t"] = GetNumInfo(C.wchar_t(0))
cgoNumMap["C.int"] = GetNumInfo(C.int(0))
cgoNumMap["C.uint"] = GetNumInfo(C.uint(0))
cgoNumMap["C.long"] = GetNumInfo(C.long(0))
cgoNumMap["C.ulong"] = GetNumInfo(C.ulong(0))
cgoNumMap["C.longlong"] = GetNumInfo(C.longlong(0))
cgoNumMap["C.ulonglong"] = GetNumInfo(C.ulonglong(0))
cgoNumMap["C.float"] = GetNumInfo(C.float(0))
cgoNumMap["C.double"] = GetNumInfo(C.double(0))
cgoNumMap["complex64"] = GetNumInfo(complex64(0))
cgoNumMap["complex128"] = GetNumInfo(complex128(0))
}
func (z *zeroconf) addPrinter(name string, port uint16, ty, url, id string, online bool) error {
z.pMutex.RLock()
if _, exists := z.printers[name]; exists {
z.pMutex.RUnlock()
return fmt.Errorf("Bonjour already has printer %s", name)
}
z.pMutex.RUnlock()
nameC := C.CString(name)
defer C.free(unsafe.Pointer(nameC))
serviceTypeC := C.CString(serviceType)
defer C.free(unsafe.Pointer(serviceTypeC))
tyC := C.CString(ty)
defer C.free(unsafe.Pointer(tyC))
urlC := C.CString(url)
defer C.free(unsafe.Pointer(urlC))
idC := C.CString(id)
defer C.free(unsafe.Pointer(idC))
var onlineC *C.char
if online {
onlineC = C.CString("online")
} else {
onlineC = C.CString("offline")
}
defer C.free(unsafe.Pointer(onlineC))
var errstr *C.char = nil
service := C.startBonjour(nameC, serviceTypeC, C.ushort(port), tyC, urlC, idC, onlineC, &errstr)
if errstr != nil {
defer C.free(unsafe.Pointer(errstr))
return errors.New(C.GoString(errstr))
}
z.pMutex.Lock()
defer z.pMutex.Unlock()
z.printers[name] = service
return nil
}
func (a *AdvancedSettings) toC() *C.FMOD_ADVANCEDSETTINGS {
var as C.FMOD_ADVANCEDSETTINGS
as.cbSize = C.int(a.CbSize)
as.maxMPEGCodecs = C.int(a.MaxMPEGCodecs)
as.maxADPCMCodecs = C.int(a.MaxADPCMCodecs)
as.maxXMACodecs = C.int(a.MaxXMACodecs)
as.maxVorbisCodecs = C.int(a.MaxVorbisCodecs)
as.maxAT9Codecs = C.int(a.MaxAT9Codecs)
as.maxFADPCMCodecs = C.int(a.MaxFADPCMCodecs)
as.maxPCMCodecs = C.int(a.MaxPCMCodecs)
as.ASIONumChannels = C.int(a.ASIONumChannels)
outer := make([]*C.char, a.ASIONumChannels+1)
for i, inner := range a.ASIOChannelList {
outer[i] = C.CString(string(inner))
}
as.ASIOChannelList = (**C.char)(unsafe.Pointer(&outer[0]))
//as.ASIOSpeakerList = C.FMOD_SPEAKER(a.ASIOSpeakerList) //TODO
as.HRTFMinAngle = C.float(a.HRTFMinAngle)
as.HRTFMaxAngle = C.float(a.HRTFMaxAngle)
as.HRTFFreq = C.float(a.HRTFFreq)
as.vol0virtualvol = C.float(a.Vol0virtualvol)
as.defaultDecodeBufferSize = C.uint(a.DefaultDecodeBufferSize)
as.profilePort = C.ushort(a.ProfilePort)
as.geometryMaxFadeTime = C.uint(a.GeometryMaxFadeTime)
as.distanceFilterCenterFreq = C.float(a.DistanceFilterCenterFreq)
as.reverb3Dinstance = C.int(a.Reverb3Dinstance)
as.DSPBufferPoolSize = C.int(a.DSPBufferPoolSize)
as.stackSizeStream = C.uint(a.StackSizeStream)
as.stackSizeNonBlocking = C.uint(a.StackSizeNonBlocking)
as.stackSizeMixer = C.uint(a.StackSizeMixer)
as.resamplerMethod = C.FMOD_DSP_RESAMPLER(a.ReSamplerMethod)
as.commandQueueSize = C.uint(a.CommandQueueSize)
as.randomSeed = C.uint(a.RandomSeed)
return *(**C.FMOD_ADVANCEDSETTINGS)(unsafe.Pointer(&as))
}
// Simple is the 'simple' interface.
// If port is 0, the default remctl port is used
// If principal is "", the default principal of "host/<hostname>" is used
//
// For more control of how the call is made, use the more 'complex'
// interface.
func Simple(host string, port uint16, principal string, command []string) (*RemctlResult, error) {
var res *C.struct_remctl_result
host_c := C.CString(host)
defer C.free(unsafe.Pointer(host_c))
var principal_c *_Ctype_char
if principal != "" {
principal_c = C.CString(principal)
defer C.free(unsafe.Pointer(principal_c))
}
command_len := len(command)
command_c := C.makeCharArray(C.int(command_len))
defer C.freeCharArray(command_c, C.int(command_len))
for i, s := range command {
C.setArrayString(command_c, C.CString(s), C.int(i))
}
res, err := C.remctl(host_c, C.ushort(port), principal_c, command_c)
if res == nil {
return nil, err
} else {
defer C.remctl_result_free((*C.struct_remctl_result)(unsafe.Pointer(res)))
result := &RemctlResult{}
stdout_len := (C.int)(res.stdout_len)
stderr_len := (C.int)(res.stderr_len)
result.Stdout = C.GoStringN(res.stdout_buf, stdout_len)
result.Stderr = C.GoStringN(res.stderr_buf, stderr_len)
result.Status = (int)(res.status)
if res.error != nil {
return nil, errors.New(C.GoString(res.error))
}
return result, nil
}
}
// Open() a connection
//
// Open a connection to `host' on port `port'. If port is 0, use the default
// remctl port. You may specify a principal to use in `principal', if it is
// a blank string the remctl will use the default principal.
func (r *remctl) Open(host string, port uint16, principal string) error {
if r.isopen() {
return errors.New("Already open")
}
host_c := C.CString(host)
defer C.free(unsafe.Pointer(host_c))
port_c := C.ushort(port)
principal_c := get_principal(principal)
if principal != "" {
// If principal is empty, principal_c is NULL, don't free
defer C.free(unsafe.Pointer(principal_c))
}
if opened := C.remctl_open(r.ctx, host_c, port_c, principal_c); opened != 1 {
return r.get_error()
}
r.open = true
return nil
}
// handleClientStateChange makes clean transitions as the connection with
// avahi-daemon changes.
//export handleClientStateChange
func handleClientStateChange(client *C.AvahiClient, newState C.AvahiClientState, userdata unsafe.Pointer) {
z := instance
z.spMutex.Lock()
defer z.spMutex.Unlock()
// Transition from not connecting to connecting. Warn in logs.
if z.state != C.AVAHI_CLIENT_CONNECTING && newState == C.AVAHI_CLIENT_CONNECTING {
glog.Warning("Avahi client is looking for avahi-daemon. Is it running?")
}
// Transition from running to not running. Free all groups.
if z.state == C.AVAHI_CLIENT_S_RUNNING && newState != C.AVAHI_CLIENT_S_RUNNING {
glog.Info("Avahi client stopped running.")
for name, r := range z.printers {
if r.group != nil {
var errstr *C.char
C.removeAvahiGroup(z.threadedPoll, r.group, &errstr)
if errstr != nil {
fmt.Println(C.GoString(errstr))
C.free(unsafe.Pointer(errstr))
}
r.group = nil
z.printers[name] = r
}
}
}
// Transition from not running to running. Recreate all groups.
if z.state != C.AVAHI_CLIENT_S_RUNNING && newState == C.AVAHI_CLIENT_S_RUNNING {
glog.Info("Avahi client running.")
for name, r := range z.printers {
tyC := C.CString(r.ty)
defer C.free(unsafe.Pointer(tyC))
urlC := C.CString(r.url)
defer C.free(unsafe.Pointer(urlC))
idC := C.CString(r.id)
defer C.free(unsafe.Pointer(idC))
var onlineC *C.char
if r.online {
onlineC = C.CString("online")
} else {
onlineC = C.CString("offline")
}
defer C.free(unsafe.Pointer(onlineC))
var errstr *C.char
C.addAvahiGroup(z.threadedPoll, z.client, &r.group, r.name, C.ushort(r.port),
tyC, urlC, idC, onlineC, &errstr)
if errstr != nil {
err := errors.New(C.GoString(errstr))
C.free(unsafe.Pointer(errstr))
glog.Error(err)
}
z.printers[name] = r
}
}
// Transition from not failure to failure. Recreate thread poll and client.
if z.state != C.AVAHI_CLIENT_FAILURE && newState == C.AVAHI_CLIENT_FAILURE {
z.restart <- struct{}{}
}
z.state = newState
}