// Returns nil on device error, missing entry on sysattr error
func (self Device) SysAttrs(sysAttrs ...string) map[string]string {
udev := C.udev_new()
defer C.udev_unref(udev)
cSysPath := C.CString(self.SysPath)
defer C.free(unsafe.Pointer(cSysPath))
udev_device := C.udev_device_new_from_syspath(udev, cSysPath)
if udev_device == nil {
return nil
}
defer C.udev_device_unref(udev_device)
// get
out := make(map[string]string)
for _, sysAttr := range sysAttrs {
cSysAttr := C.CString(sysAttr)
defer C.free(unsafe.Pointer(cSysAttr))
cValue := C.udev_device_get_sysattr_value(udev_device, cSysAttr)
if cValue == nil {
continue
}
out[sysAttr] = C.GoString(cValue)
}
return out
}
// Lock locks a udev context
func (u *Udev) lock() {
u.once.Do(func() {
u.ptr = C.udev_new()
runtime.SetFinalizer(u, udevUnref)
})
u.m.Lock()
}
/*
* Filter by match fields:
* * Subsystem
*/
func Enumerate(match Device) ([]Device, error) {
udev := C.udev_new()
defer C.udev_unref(udev)
udev_enumerate := C.udev_enumerate_new(udev)
defer C.udev_enumerate_unref(udev_enumerate)
if match.Subsystem != "" {
// libudev strdup's the string
cSubsystem := C.CString(match.Subsystem)
defer C.free(unsafe.Pointer(cSubsystem))
if C.udev_enumerate_add_match_subsystem(udev_enumerate, cSubsystem) < 0 {
return nil, Error{"udev_enumerate_add_match_subsystem"}
}
}
if C.udev_enumerate_scan_devices(udev_enumerate) < 0 {
return nil, Error{"udev_enumerate_scan_devices"}
}
// list
var devices []Device
udev_list_entry := C.udev_enumerate_get_list_entry(udev_enumerate)
for ; udev_list_entry != nil; udev_list_entry = C.udev_list_entry_get_next(udev_list_entry) {
udev_device := C.udev_device_new_from_syspath(udev, C.udev_list_entry_get_name(udev_list_entry))
if udev_device == nil {
return nil, Error{"udev_device_new_from_syspath"}
}
defer C.udev_device_unref(udev_device)
var device Device
if err := device.fromUdev(udev_device); err != nil {
return nil, err
} else {
devices = append(devices, device)
}
}
return devices, nil
}
func MonitorUdev(subsystem string) (*Monitor, error) {
cName := C.CString("udev")
defer C.free(unsafe.Pointer(cName))
udev := C.udev_new()
udev_monitor := C.udev_monitor_new_from_netlink(udev, cName)
if udev_monitor == nil {
C.udev_unref(udev)
return nil, Error{"udev_monitor_new_from_netlink"}
}
if subsystem != "" {
cSubsystem := C.CString(subsystem)
defer C.free(unsafe.Pointer(cSubsystem))
if C.udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, cSubsystem, nil) < 0 {
C.udev_monitor_unref(udev_monitor)
C.udev_unref(udev)
return nil, Error{"udev_monitor_filter_add_match_subsystem_devtype"}
}
}
if C.udev_monitor_enable_receiving(udev_monitor) < 0 {
C.udev_monitor_unref(udev_monitor)
C.udev_unref(udev)
return nil, Error{"udev_monitor_enable_receiving"}
}
// set blocking
if fd := C.udev_monitor_get_fd(udev_monitor); fd < 0 {
C.udev_monitor_unref(udev_monitor)
C.udev_unref(udev)
return nil, Error{"udev_monitor_get_fd"}
} else if err := syscall.SetNonblock(int(fd), false); err != nil {
C.udev_monitor_unref(udev_monitor)
C.udev_unref(udev)
return nil, err
}
return &Monitor{udev, udev_monitor}, nil
}
func (self Device) ParentWithSubsystemDevType(subsystem string, devtype string) (device Device, err error) {
udev := C.udev_new()
defer C.udev_unref(udev)
cSysPath := C.CString(self.SysPath)
defer C.free(unsafe.Pointer(cSysPath))
udev_device := C.udev_device_new_from_syspath(udev, cSysPath)
if udev_device == nil {
return device, Error{"udev_device_new_from_syspath"}
}
defer C.udev_device_unref(udev_device)
// parent
cSubsystem := C.CString(subsystem)
defer C.free(unsafe.Pointer(cSubsystem))
var cDevType *C.char
if devtype != "" {
cDevType = C.CString(devtype)
defer C.free(unsafe.Pointer(cDevType))
}
udev_parent := C.udev_device_get_parent_with_subsystem_devtype(udev_device, cSubsystem, cDevType)
if udev_parent == nil {
return device, Error{"udev_device_get_parent"}
}
// lifetime tied to udev_device
// return
if err := device.fromUdev(udev_parent); err != nil {
return device, err
}
return device, nil
}
func NewUdev() Udev {
var u = C.udev_new()
return Udev{u}
}
func enumerate() ([]DeviceDescription, error) {
var result []DeviceDescription
udev := C.udev_new()
if udev == nil {
return nil, errors.New("Udev connection failed!")
}
enumerate := C.udev_enumerate_new(udev)
if enumerate == nil {
return nil, errors.New("Unix: udev_enumerate_new() returned: 0")
}
var devices *C.struct_udev_list_entry
C.udev_enumerate_add_match_subsystem(enumerate, C.CString("tty"))
C.udev_enumerate_scan_devices(enumerate)
devices = C.udev_enumerate_get_list_entry(enumerate)
for devices != nil {
syspath := C.udev_list_entry_get_name(devices)
udev_device := C.udev_device_new_from_syspath(udev, syspath)
if udev_device != nil {
var dev DeviceDescription
s := C.GoString(C.udev_device_get_devnode(udev_device))
for _, mask := range devNamesMask {
if strings.Contains(s, mask) {
dev.Description = C.GoString(C.udev_device_get_property_value(
udev_device, C.CString("ID_MODEL_FROM_DATABASE")))
dev.Revision = C.GoString(C.udev_device_get_property_value(
udev_device, C.CString("ID_REVISION")))
dev.Bus = C.GoString(C.udev_device_get_property_value(
udev_device, C.CString("ID_BUS")))
dev.Driver = C.GoString(C.udev_device_get_property_value(
udev_device, C.CString(eqBusDrvMap[dev.Bus])))
dev.LocationInfo = strings.Replace(C.GoString(C.udev_device_get_property_value(
udev_device, C.CString("ID_MODEL_ENC"))), "\\x20", " ", -1)
dev.Manufacturer = C.GoString(C.udev_device_get_property_value(
udev_device, C.CString("ID_VENDOR_FROM_DATABASE")))
dev.SubSystem = C.GoString(C.udev_device_get_property_value(
udev_device, C.CString("SUBSYSTEM")))
dev.SystemPath = C.GoString(C.udev_device_get_syspath(udev_device))
dev.ShortName = C.GoString(C.udev_device_get_property_value(
udev_device, C.CString("DEVNAME")))
dev.Name = dev.ShortName
dev.FriendlyName = fmt.Sprintf("%s (%s)", dev.Description, dev.ShortName)
var v []byte
var err error
if v, err = hex.DecodeString(C.GoString(C.udev_device_get_property_value(
udev_device, C.CString("ID_VENDOR_ID")))); err == nil && len(v) == 2 {
dev.VendorID = (uint16)(v[0])<<8 + (uint16)(v[1])
}
if v, err = hex.DecodeString(C.GoString(C.udev_device_get_property_value(
udev_device, C.CString("ID_MODEL_ID")))); err == nil && len(v) == 2 {
dev.ProductID = (uint16)(v[0])<<8 + (uint16)(v[1])
}
result = append(result, dev)
}
}
}
devices = C.udev_list_entry_get_next(devices)
}
C.udev_enumerate_unref(enumerate)
return result, nil
}