X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=libudev%2Flibudev-device.c;h=1024b46803b9d447611bb289ca6d7355b36d05fd;hb=d1c13ddcb3497e0c6a37cd9bd117b74ef010bc15;hp=273e5cb59c97e8eb4482e2e43f57162aced55640;hpb=cdfdc85fb5728c844460c67641bea7197e104b12;p=elogind.git

diff --git a/libudev/libudev-device.c b/libudev/libudev-device.c
index 273e5cb59..1024b4680 100644
--- a/libudev/libudev-device.c
+++ b/libudev/libudev-device.c
@@ -92,7 +92,7 @@ struct udev_device {
 };
 
 /**
- * udev_device_get_devnum:
+ * udev_device_get_seqnum:
  * @udev_device: udev device
  *
  * This is only valid if the device was received through a monitor. Devices read from
@@ -437,6 +437,8 @@ void udev_device_add_property_from_string_parse(struct udev_device *udev_device,
 				udev_device_add_tag(udev_device, tag);
 			}
 		}
+	} else if (strncmp(property, "USEC_INITIALIZED=", 19) == 0) {
+		udev_device_set_usec_initialized(udev_device, strtoull(&property[19], NULL, 10));
 	} else if (strncmp(property, "DRIVER=", 7) == 0) {
 		udev_device_set_driver(udev_device, &property[7]);
 	} else if (strncmp(property, "ACTION=", 7) == 0) {
@@ -1322,7 +1324,11 @@ unsigned long long udev_device_get_usec_initialized(struct udev_device *udev_dev
 
 void udev_device_set_usec_initialized(struct udev_device *udev_device, unsigned long long usec_initialized)
 {
+	char num[32];
+
 	udev_device->usec_initialized = usec_initialized;
+	snprintf(num, sizeof(num), "%llu", usec_initialized);
+	udev_device_add_property(udev_device, "USEC_INITIALIZED", num);
 }
 
 /**
@@ -1367,27 +1373,32 @@ UDEV_EXPORT const char *udev_device_get_sysattr_value(struct udev_device *udev_d
 	}
 
 	if (S_ISLNK(statbuf.st_mode)) {
-		char target[UTIL_NAME_SIZE];
-		int len;
-		char *pos;
-
-		/* some core links return the last element of the target path */
-		if (strcmp(sysattr, "driver") != 0 &&
-		    strcmp(sysattr, "subsystem") != 0 &&
-		    strcmp(sysattr, "module") != 0)
-			goto out;
+		struct udev_device *dev;
 
-		len = readlink(path, target, sizeof(target));
-		if (len <= 0 || len == sizeof(target))
+		/*
+		 * Some core links return only the last element of the target path,
+		 * these are just values, the paths should not be exposed.
+		 */
+		if (strcmp(sysattr, "driver") == 0 ||
+		    strcmp(sysattr, "subsystem") == 0 ||
+		    strcmp(sysattr, "module") == 0) {
+			if (util_get_sys_core_link_value(udev_device->udev, sysattr,
+							 udev_device->syspath, value, sizeof(value)) < 0)
+				return NULL;
+			dbg(udev_device->udev, "cache '%s' with link value '%s'\n", sysattr, value);
+			list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, value);
+			val = udev_list_entry_get_value(list_entry);
 			goto out;
-		target[len] = '\0';
+		}
 
-		pos = strrchr(target, '/');
-		if (pos != NULL) {
-			pos = &pos[1];
-			dbg(udev_device->udev, "cache '%s' with link value '%s'\n", sysattr, pos);
-			list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr, pos);
+		/* resolve link to a device and return its syspath */
+		util_strscpyl(path, sizeof(path), udev_device->syspath, "/", sysattr, NULL);
+		dev = udev_device_new_from_syspath(udev_device->udev, path);
+		if (dev != NULL) {
+			list_entry = udev_list_entry_add(&udev_device->sysattr_value_list, sysattr,
+							 udev_device_get_syspath(dev));
 			val = udev_list_entry_get_value(list_entry);
+			udev_device_unref(dev);
 		}
 
 		goto out;