// 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
}
/*
* 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 (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 deviceUnref(d *Device) {
C.udev_device_unref(d.ptr)
}