libudev: record and export "age" of device record

[elogind.git] / libudev / libudev-device.c

diff --git a/libudev/libudev-device.c b/libudev/libudev-device.c
index 66f806316f55d75143f4d7a2e2242f99bcad805b..16bee19dff4cca9463aab0b24e44fd593d1d12e0 100644 (file)
--- a/libudev/libudev-device.c
+++ b/libudev/libudev-device.c
@@ -63,6 +63,7 @@ struct udev_device {
        struct udev_list_node sysattr_list;
        struct udev_list_node tags_list;
        unsigned long long int seqnum;
        struct udev_list_node sysattr_list;
        struct udev_list_node tags_list;
        unsigned long long int seqnum;

+       unsigned long long int usec_initialized;

        int event_timeout;
        int timeout;
        int devlink_priority;
        int event_timeout;
        int timeout;
        int devlink_priority;


@@ -284,6 +285,9 @@ int udev_device_read_db(struct udev_device *udev_device)
                case 'W':
                        udev_device_set_watch_handle(udev_device, atoi(val));
                        break;
                case 'W':
                        udev_device_set_watch_handle(udev_device, atoi(val));
                        break;

+               case 'I':
+                       udev_device_set_usec_initialized(udev_device, strtoull(val, NULL, 10));
+                       break;

                }
        }
        fclose(f);
                }
        }
        fclose(f);


@@ -1094,6 +1098,44 @@ unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device)
        return udev_device->seqnum;
 }
 
        return udev_device->seqnum;
 }
 

+/**
+ * udev_device_get_usec_since_initialized:
+ * @udev_device: udev device
+ *
+ * Return the number of microseconds passed since udev set up the
+ * device for the first time.
+ *
+ * This is only implemented for devices with need to store properties
+ * in the udev database. All other devices return 0 here.
+ *
+ * Returns: the number of microseconds since the device was first seen.
+ **/
+unsigned long long int udev_device_get_usec_since_initialized(struct udev_device *udev_device)
+{
+       unsigned long long now;
+
+       if (udev_device == NULL)
+               return 0;
+       if (!udev_device->info_loaded)
+               udev_device_read_db(udev_device);
+       if (udev_device->usec_initialized == 0)
+               return 0;
+       now = usec_monotonic();
+       if (now == 0)
+               return 0;
+       return now - udev_device->usec_initialized;
+}
+
+unsigned long long udev_device_get_usec_initialized(struct udev_device *udev_device)
+{
+       return udev_device->usec_initialized;
+}
+
+void udev_device_set_usec_initialized(struct udev_device *udev_device, unsigned long long usec_initialized)
+{
+       udev_device->usec_initialized = usec_initialized;
+}
+

 /**
  * udev_device_get_sysattr_value:
  * @udev_device: udev device
 /**
  * udev_device_get_sysattr_value:
  * @udev_device: udev device


@@ -1318,7 +1360,7 @@ const char *udev_device_get_id_filename(struct udev_device *udev_device)
  * device node permissions and context, or has renamed a network
  * device.
  *
  * device node permissions and context, or has renamed a network
  * device.
  *

- * For now, this is only implemented for devices with a device node
+ * This is only implemented for devices with a device node

  * or network interfaces. All other devices return 1 here.
  *
  * Returns: 1 if the device is set up. 0 otherwise.
  * or network interfaces. All other devices return 1 here.
  *
  * Returns: 1 if the device is set up. 0 otherwise.