// 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
}
func (self *Monitor) Close() {
C.udev_monitor_unref(self.udev_monitor)
C.udev_unref(self.udev)
self.udev_monitor = nil
self.udev = 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
}
/*
* 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 (u Udev) Unref() {
C.udev_unref(u.ptr)
}
func udevUnref(u *Udev) {
C.udev_unref(u.ptr)
}