// SysattrValue retrieves the content of a sys attribute file, and returns an empty string if there is no sys attribute value.
// The retrieved value is cached in the device.
// Repeated calls will return the same value and not open the attribute again.
func (d *Device) SysattrValue(sysattr string) string {
d.lock()
defer d.unlock()
s := C.CString(sysattr)
defer freeCharPtr(s)
return C.GoString(C.udev_device_get_sysattr_value(d.ptr, s))
}
// 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 (d Device) SysAttrValue(sysattr string) string {
return C.GoString(C.udev_device_get_sysattr_value(d.ptr, C.CString(sysattr)))
}