X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev%2Flib%2Flibudev-device.c;h=0cb59212815459924f7319187ff7e5b0d81e9f21;hp=a201fb25df95c17250ec184ce44822eeff8a200a;hb=61ee8cc92d5298da4fd4f46016991369a933ef7f;hpb=b95f8a76e614004c69fcf829568c826a7e769bbe

diff --git a/udev/lib/libudev-device.c b/udev/lib/libudev-device.c
index a201fb25d..0cb592128 100644
--- a/udev/lib/libudev-device.c
+++ b/udev/lib/libudev-device.c
@@ -25,81 +25,118 @@
 #include <string.h>
 #include <dirent.h>
 #include <fcntl.h>
+#include <ctype.h>
 #include <sys/stat.h>
 
 #include "libudev.h"
 #include "libudev-private.h"
 
 struct udev_device {
-	int refcount;
 	struct udev *udev;
 	struct udev_device *parent_device;
 	char *syspath;
 	const char *devpath;
-	const char *sysname;
+	char *sysname;
+	const char *sysnum;
 	char *devnode;
 	char *subsystem;
-	struct list_node devlink_list;
-	struct list_node properties_list;
-	char *action;
-	int event_timeout;
+	char *devtype;
 	char *driver;
+	char *action;
 	char *devpath_old;
 	char *physdevpath;
-	int timeout;
-	dev_t devnum;
+	char **envp;
+	char *monitor_buf;
+	size_t monitor_buf_len;
+	struct udev_list_node devlinks_list;
+	struct udev_list_node properties_list;
+	struct udev_list_node sysattr_list;
 	unsigned long long int seqnum;
+	int event_timeout;
+	int timeout;
 	int num_fake_partitions;
 	int devlink_priority;
-	int ignore_remove;
-	struct list_node attr_list;
-	int info_loaded;
+	int refcount;
+	dev_t devnum;
+	unsigned int parent_set:1;
+	unsigned int subsystem_set:1;
+	unsigned int devtype_set:1;
+	unsigned int devlinks_uptodate:1;
+	unsigned int envp_uptodate:1;
+	unsigned int driver_set:1;
+	unsigned int info_loaded:1;
+	unsigned int ignore_remove:1;
 };
 
-static size_t syspath_to_db_path(struct udev_device *udev_device, char *filename, size_t len)
+static size_t devpath_to_db_path(struct udev *udev, const char *devpath, char *filename, size_t len)
 {
 	size_t start;
 
 	/* translate to location of db file */
-	util_strlcpy(filename, udev_get_dev_path(udev_device->udev), len);
+	util_strlcpy(filename, udev_get_dev_path(udev), len);
 	start = util_strlcat(filename, "/.udev/db/", len);
-	util_strlcat(filename, udev_device->devpath, len);
+	util_strlcat(filename, devpath, len);
 	return util_path_encode(&filename[start], len - start);
 }
 
-static int device_read_db(struct udev_device *udev_device)
+int udev_device_read_db(struct udev_device *udev_device)
 {
 	struct stat stats;
 	char filename[UTIL_PATH_SIZE];
 	char line[UTIL_LINE_SIZE];
 	FILE *f;
 
-	syspath_to_db_path(udev_device, filename, sizeof(filename));
+	devpath_to_db_path(udev_device->udev, udev_device->devpath, filename, sizeof(filename));
 
 	if (lstat(filename, &stats) != 0) {
-		info(udev_device->udev, "no db file to read %s: %s\n", filename, strerror(errno));
+		dbg(udev_device->udev, "no db file to read %s: %m\n", filename);
 		return -1;
 	}
 	if ((stats.st_mode & S_IFMT) == S_IFLNK) {
 		char target[UTIL_PATH_SIZE];
+		char devnode[UTIL_PATH_SIZE];
 		int target_len;
+		char *next;
 
 		target_len = readlink(filename, target, sizeof(target));
 		if (target_len > 0)
 			target[target_len] = '\0';
 		else {
-			info(udev_device->udev, "error reading db link %s: %s\n", filename, strerror(errno));
+			dbg(udev_device->udev, "error reading db link %s: %m\n", filename);
 			return -1;
 		}
-		if (asprintf(&udev_device->devnode, "%s/%s", udev_get_dev_path(udev_device->udev), target) < 0)
-			return -ENOMEM;
+
+		next = strchr(target, ' ');
+		if (next != NULL) {
+			next[0] = '\0';
+			next = &next[1];
+		}
+		util_strlcpy(devnode, udev_get_dev_path(udev_device->udev), sizeof(devnode));
+		util_strlcat(devnode, "/", sizeof(devnode));
+		util_strlcat(devnode, target, sizeof(devnode));
+		udev_device_set_devnode(udev_device, devnode);
+		while (next != NULL) {
+			char devlink[UTIL_PATH_SIZE];
+			const char *lnk;
+
+			lnk = next;
+			next = strchr(next, ' ');
+			if (next != NULL) {
+				next[0] = '\0';
+				next = &next[1];
+			}
+			util_strlcpy(devlink, udev_get_dev_path(udev_device->udev), sizeof(devlink));
+			util_strlcat(devlink, "/", sizeof(devlink));
+			util_strlcat(devlink, lnk, sizeof(devlink));
+			udev_device_add_devlink(udev_device, devlink);
+		}
 		info(udev_device->udev, "device %p filled with db symlink data '%s'\n", udev_device, udev_device->devnode);
 		return 0;
 	}
 
 	f = fopen(filename, "r");
 	if (f == NULL) {
-		info(udev_device->udev, "error reading db file %s: %s\n", filename, strerror(errno));
+		dbg(udev_device->udev, "error reading db file %s: %m\n", filename);
 		return -1;
 	}
 	while (fgets(line, sizeof(line), f)) {
@@ -111,31 +148,33 @@ static int device_read_db(struct udev_device *udev_device)
 			break;
 		line[len-1] = '\0';
 		val = &line[2];
-
 		switch(line[0]) {
 		case 'N':
-			asprintf(&udev_device->devnode, "%s/%s", udev_get_dev_path(udev_device->udev), val);
+			util_strlcpy(filename, udev_get_dev_path(udev_device->udev), sizeof(filename));
+			util_strlcat(filename, "/", sizeof(filename));
+			util_strlcat(filename, val, sizeof(filename));
+			udev_device_set_devnode(udev_device, filename);
 			break;
 		case 'S':
 			util_strlcpy(filename, udev_get_dev_path(udev_device->udev), sizeof(filename));
 			util_strlcat(filename, "/", sizeof(filename));
 			util_strlcat(filename, val, sizeof(filename));
-			device_add_devlink(udev_device, filename);
+			udev_device_add_devlink(udev_device, filename);
 			break;
 		case 'L':
-			device_set_devlink_priority(udev_device, atoi(val));
+			udev_device_set_devlink_priority(udev_device, atoi(val));
 			break;
 		case 'T':
-			device_set_event_timeout(udev_device, atoi(val));
+			udev_device_set_event_timeout(udev_device, atoi(val));
 			break;
 		case 'A':
-			device_set_num_fake_partitions(udev_device, atoi(val));
+			udev_device_set_num_fake_partitions(udev_device, atoi(val));
 			break;
 		case 'R':
-			device_set_ignore_remove(udev_device, atoi(val));
+			udev_device_set_ignore_remove(udev_device, atoi(val));
 			break;
 		case 'E':
-			device_add_property_from_string(udev_device, val);
+			udev_device_add_property_from_string(udev_device, val);
 			break;
 		}
 	}
@@ -145,7 +184,7 @@ static int device_read_db(struct udev_device *udev_device)
 	return 0;
 }
 
-static int device_read_uevent_file(struct udev_device *udev_device)
+int udev_device_read_uevent_file(struct udev_device *udev_device)
 {
 	char filename[UTIL_PATH_SIZE];
 	FILE *f;
@@ -167,12 +206,14 @@ static int device_read_uevent_file(struct udev_device *udev_device)
 			continue;
 		pos[0] = '\0';
 
-		if (strncmp(line, "MAJOR=", 6) == 0)
+		if (strncmp(line, "DEVTYPE=", 8) == 0)
+			udev_device_set_devtype(udev_device, &line[8]);
+		else if (strncmp(line, "MAJOR=", 6) == 0)
 			maj = strtoull(&line[6], NULL, 10);
 		else if (strncmp(line, "MINOR=", 6) == 0)
 			min = strtoull(&line[6], NULL, 10);
 
-		device_add_property_from_string(udev_device, line);
+		udev_device_add_property_from_string(udev_device, line);
 	}
 
 	udev_device->devnum = makedev(maj, min);
@@ -183,33 +224,39 @@ static int device_read_uevent_file(struct udev_device *udev_device)
 
 static void device_load_info(struct udev_device *device)
 {
-	device_read_uevent_file(device);
-	device_read_db(device);
 	device->info_loaded = 1;
+	udev_device_read_uevent_file(device);
+	udev_device_read_db(device);
 }
 
-void device_set_info_loaded(struct udev_device *device)
+void udev_device_set_info_loaded(struct udev_device *device)
 {
 	device->info_loaded = 1;
 }
 
-struct udev_device *device_init(struct udev *udev)
+struct udev_device *device_new(struct udev *udev)
 {
 	struct udev_device *udev_device;
+	struct udev_list_entry *list_entry;
 
 	if (udev == NULL)
 		return NULL;
 
-	udev_device = malloc(sizeof(struct udev_device));
+	udev_device = calloc(1, sizeof(struct udev_device));
 	if (udev_device == NULL)
 		return NULL;
-	memset(udev_device, 0x00, sizeof(struct udev_device));
 	udev_device->refcount = 1;
 	udev_device->udev = udev;
-	list_init(&udev_device->devlink_list);
-	list_init(&udev_device->properties_list);
-	list_init(&udev_device->attr_list);
-	info(udev_device->udev, "udev_device: %p created\n", udev_device);
+	udev_list_init(&udev_device->devlinks_list);
+	udev_list_init(&udev_device->properties_list);
+	udev_list_init(&udev_device->sysattr_list);
+	udev_device->event_timeout = -1;
+	/* copy global properties */
+	udev_list_entry_foreach(list_entry, udev_get_properties_list_entry(udev))
+		udev_device_add_property(udev_device,
+					 udev_list_entry_get_name(list_entry),
+					 udev_list_entry_get_value(list_entry));
+	dbg(udev_device->udev, "udev_device: %p created\n", udev_device);
 	return udev_device;
 }
 
@@ -223,7 +270,7 @@ struct udev_device *device_init(struct udev *udev)
  * path to the device, including the sys mount point.
  *
  * The initial refcount is 1, and needs to be decremented to
- * release the ressources of the udev device.
+ * release the resources of the udev device.
  *
  * Returns: a new udev device, or #NULL, if it does not exist
  **/
@@ -231,8 +278,8 @@ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *
 {
 	size_t len;
 	const char *subdir;
-	const char *pos;
 	char path[UTIL_PATH_SIZE];
+	char *pos;
 	struct stat statbuf;
 	struct udev_device *udev_device;
 
@@ -252,7 +299,7 @@ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *
 	subdir = &syspath[len+1];
 	pos = strrchr(subdir, '/');
 	if (pos == NULL || pos < &subdir[2]) {
-		info(udev, "not in subdir :%s\n", syspath);
+		dbg(udev, "not a subdir :%s\n", syspath);
 		return NULL;
 	}
 
@@ -260,6 +307,23 @@ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *
 	util_strlcpy(path, syspath, sizeof(path));
 	util_resolve_sys_link(udev, path, sizeof(path));
 
+	/* try to resolve the silly block layout if needed */
+	if (strncmp(&path[len], "/block/", 7) == 0) {
+		char block[UTIL_PATH_SIZE];
+		char part[UTIL_PATH_SIZE];
+
+		util_strlcpy(block, path, sizeof(block));
+		pos = strrchr(block, '/');
+		if (pos == NULL)
+			return NULL;
+		util_strlcpy(part, pos, sizeof(part));
+		pos[0] = '\0';
+		if (util_resolve_sys_link(udev, block, sizeof(block)) == 0) {
+			util_strlcpy(path, block, sizeof(path));
+			util_strlcat(path, part, sizeof(path));
+		}
+	}
+
 	/* path exists in sys */
 	if (strncmp(&syspath[len], "/devices/", 9) == 0 ||
 	    strncmp(&syspath[len], "/class/", 7) == 0 ||
@@ -270,22 +334,22 @@ struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *
 		util_strlcpy(file, path, sizeof(file));
 		util_strlcat(file, "/uevent", sizeof(file));
 		if (stat(file, &statbuf) != 0) {
-			info(udev, "not a device: %s\n", syspath);
+			dbg(udev, "not a device: %s\n", syspath);
 			return NULL;
 		}
 	} else {
 		/* everything else just needs to be a directory */
 		if (stat(path, &statbuf) != 0 || !S_ISDIR(statbuf.st_mode)) {
-			info(udev, "directory not found: %s\n", syspath);
+			dbg(udev, "directory not found: %s\n", syspath);
 			return NULL;
 		}
 	}
 
-	udev_device = device_init(udev);
+	udev_device = device_new(udev);
 	if (udev_device == NULL)
 		return NULL;
 
-	device_set_syspath(udev_device, path);
+	udev_device_set_syspath(udev_device, path);
 	info(udev, "device %p has devpath '%s'\n", udev_device, udev_device_get_devpath(udev_device));
 
 	return udev_device;
@@ -295,7 +359,7 @@ struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, de
 {
 	char path[UTIL_PATH_SIZE];
 	const char *type_str;
-	struct udev_enumerate *enumerate;
+	struct udev_enumerate *udev_enumerate;
 	struct udev_list_entry *list_entry;
 	struct udev_device *device = NULL;
 
@@ -312,26 +376,124 @@ struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, de
 	if (util_resolve_sys_link(udev, path, sizeof(path)) == 0)
 		return udev_device_new_from_syspath(udev, path);
 
-	/* fallback to search all sys devices for the major/minor */
-	enumerate = udev_enumerate_new_from_subsystems(udev, NULL);
-	if (enumerate == NULL)
+	udev_enumerate = udev_enumerate_new(udev);
+	if (udev_enumerate == NULL)
 		return NULL;
-	udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(enumerate)) {
+
+	/* fallback to search sys devices for the major/minor */
+	if (type == 'b')
+		udev_enumerate_add_match_subsystem(udev_enumerate, "block");
+	else if (type == 'c')
+		udev_enumerate_add_nomatch_subsystem(udev_enumerate, "block");
+	udev_enumerate_scan_devices(udev_enumerate);
+	udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(udev_enumerate)) {
 		struct udev_device *device_loop;
 
 		device_loop = udev_device_new_from_syspath(udev, udev_list_entry_get_name(list_entry));
 		if (device_loop != NULL) {
 			if (udev_device_get_devnum(device_loop) == devnum) {
+				if (type == 'b' && strcmp(udev_device_get_subsystem(device_loop), "block") != 0)
+					continue;
+				if (type == 'c' && strcmp(udev_device_get_subsystem(device_loop), "block") == 0)
+					continue;
 				device = device_loop;
 				break;
 			}
 			udev_device_unref(device_loop);
 		}
 	}
-	udev_enumerate_unref(enumerate);
+	udev_enumerate_unref(udev_enumerate);
 	return device;
 }
 
+struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
+{
+	size_t sys_path_len;
+	char path_full[UTIL_PATH_SIZE];
+	char *path;
+	struct stat statbuf;
+
+	sys_path_len = util_strlcpy(path_full, udev_get_sys_path(udev), sizeof(path_full));
+	path = &path_full[sys_path_len];
+
+	if (strcmp(subsystem, "subsystem") == 0) {
+		util_strlcpy(path, "/subsystem/", sizeof(path_full) - sys_path_len);
+		util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
+		if (stat(path_full, &statbuf) == 0)
+			goto found;
+
+		util_strlcpy(path, "/bus/", sizeof(path_full) - sys_path_len);
+		util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
+		if (stat(path_full, &statbuf) == 0)
+			goto found;
+
+		util_strlcpy(path, "/class/", sizeof(path_full) - sys_path_len);
+		util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
+		if (stat(path_full, &statbuf) == 0)
+			goto found;
+		goto out;
+	}
+
+	if (strcmp(subsystem, "module") == 0) {
+		util_strlcpy(path, "/module/", sizeof(path_full) - sys_path_len);
+		util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
+		if (stat(path_full, &statbuf) == 0)
+			goto found;
+		goto out;
+	}
+
+	if (strcmp(subsystem, "drivers") == 0) {
+		char subsys[UTIL_NAME_SIZE];
+		char *driver;
+
+		util_strlcpy(subsys, sysname, sizeof(subsys));
+		driver = strchr(subsys, ':');
+		if (driver != NULL) {
+			driver[0] = '\0';
+			driver = &driver[1];
+			util_strlcpy(path, "/subsystem/", sizeof(path_full) - sys_path_len);
+			util_strlcat(path, subsys, sizeof(path_full) - sys_path_len);
+			util_strlcat(path, "/drivers/", sizeof(path_full) - sys_path_len);
+			util_strlcat(path, driver, sizeof(path_full) - sys_path_len);
+			if (stat(path_full, &statbuf) == 0)
+				goto found;
+
+			util_strlcpy(path, "/bus/", sizeof(path_full) - sys_path_len);
+			util_strlcat(path, subsys, sizeof(path_full) - sys_path_len);
+			util_strlcat(path, "/drivers/", sizeof(path_full) - sys_path_len);
+			util_strlcat(path, driver, sizeof(path_full) - sys_path_len);
+			if (stat(path_full, &statbuf) == 0)
+				goto found;
+		}
+		goto out;
+	}
+
+	util_strlcpy(path, "/subsystem/", sizeof(path_full) - sys_path_len);
+	util_strlcat(path, subsystem, sizeof(path_full) - sys_path_len);
+	util_strlcat(path, "/devices/", sizeof(path_full) - sys_path_len);
+	util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
+	if (stat(path_full, &statbuf) == 0)
+		goto found;
+
+	util_strlcpy(path, "/bus/", sizeof(path_full) - sys_path_len);
+	util_strlcat(path, subsystem, sizeof(path_full) - sys_path_len);
+	util_strlcat(path, "/devices/", sizeof(path_full) - sys_path_len);
+	util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
+	if (stat(path_full, &statbuf) == 0)
+		goto found;
+
+	util_strlcpy(path, "/class/", sizeof(path_full) - sys_path_len);
+	util_strlcat(path, subsystem, sizeof(path_full) - sys_path_len);
+	util_strlcat(path, "/", sizeof(path_full) - sys_path_len);
+	util_strlcat(path, sysname, sizeof(path_full) - sys_path_len);
+	if (stat(path_full, &statbuf) == 0)
+		goto found;
+out:
+	return NULL;
+found:
+	return udev_device_new_from_syspath(udev, path_full);
+}
+
 static struct udev_device *device_new_from_parent(struct udev_device *udev_device)
 {
 	struct udev_device *udev_device_parent = NULL;
@@ -343,9 +505,11 @@ static struct udev_device *device_new_from_parent(struct udev_device *udev_devic
 	    strncmp(udev_device->devpath, "/block/", 7) == 0) {
 		util_strlcpy(path, udev_device->syspath, sizeof(path));
 		util_strlcat(path, "/device", sizeof(path));
-		if (util_resolve_sys_link(udev_device->udev, path, sizeof(path)) == 0)
+		if (util_resolve_sys_link(udev_device->udev, path, sizeof(path)) == 0) {
 			udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
-		return udev_device_parent;
+			if (udev_device_parent != NULL)
+				return udev_device_parent;
+		}
 	}
 
 	util_strlcpy(path, udev_device->syspath, sizeof(path));
@@ -368,15 +532,40 @@ struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
 {
 	if (udev_device == NULL)
 		return NULL;
-
-	if (udev_device->parent_device != NULL) {
-		info(udev_device->udev, "returning existing parent %p\n", udev_device->parent_device);
-		return udev_device->parent_device;
+	if (!udev_device->parent_set) {
+		udev_device->parent_set = 1;
+		udev_device->parent_device = device_new_from_parent(udev_device);
 	}
-	udev_device->parent_device = device_new_from_parent(udev_device);
+	if (udev_device->parent_device != NULL)
+		dbg(udev_device->udev, "returning existing parent %p\n", udev_device->parent_device);
 	return udev_device->parent_device;
 }
 
+struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype)
+{
+	struct udev_device *parent;
+
+	if (subsystem == NULL)
+		return NULL;
+
+	parent = udev_device_get_parent(udev_device);
+	while (parent != NULL) {
+		const char *parent_subsystem;
+		const char *parent_devtype;
+
+		parent_subsystem = udev_device_get_subsystem(parent);
+		if (parent_subsystem != NULL && strcmp(parent_subsystem, subsystem) == 0) {
+			if (devtype == NULL)
+				break;
+			parent_devtype = udev_device_get_devtype(parent);
+			if (parent_devtype != NULL && strcmp(parent_devtype, devtype) == 0)
+				break;
+		}
+		parent = udev_device_get_parent(parent);
+	}
+	return parent;
+}
+
 /**
  * udev_device_get_udev:
  * @udev_device: udev device
@@ -413,7 +602,7 @@ struct udev_device *udev_device_ref(struct udev_device *udev_device)
  * @udev_device: udev device
  *
  * Drop a reference of a udev device. If the refcount reaches zero,
- * the ressources of the device will be released.
+ * the resources of the device will be released.
  *
  **/
 void udev_device_unref(struct udev_device *udev_device)
@@ -426,16 +615,20 @@ void udev_device_unref(struct udev_device *udev_device)
 	if (udev_device->parent_device != NULL)
 		udev_device_unref(udev_device->parent_device);
 	free(udev_device->syspath);
+	free(udev_device->sysname);
 	free(udev_device->devnode);
 	free(udev_device->subsystem);
-	list_cleanup(udev_device->udev, &udev_device->devlink_list);
-	list_cleanup(udev_device->udev, &udev_device->properties_list);
+	free(udev_device->devtype);
+	udev_list_cleanup_entries(udev_device->udev, &udev_device->devlinks_list);
+	udev_list_cleanup_entries(udev_device->udev, &udev_device->properties_list);
 	free(udev_device->action);
 	free(udev_device->driver);
 	free(udev_device->devpath_old);
 	free(udev_device->physdevpath);
-	list_cleanup(udev_device->udev, &udev_device->attr_list);
-	info(udev_device->udev, "udev_device: %p released\n", udev_device);
+	udev_list_cleanup_entries(udev_device->udev, &udev_device->sysattr_list);
+	free(udev_device->envp);
+	free(udev_device->monitor_buf);
+	dbg(udev_device->udev, "udev_device: %p released\n", udev_device);
 	free(udev_device);
 }
 
@@ -478,6 +671,13 @@ const char *udev_device_get_sysname(struct udev_device *udev_device)
 	return udev_device->sysname;
 }
 
+const char *udev_device_get_sysnum(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return NULL;
+	return udev_device->sysnum;
+}
+
 /**
  * udev_device_get_devnode:
  * @udev_device: udev device
@@ -511,31 +711,50 @@ const char *udev_device_get_subsystem(struct udev_device *udev_device)
 
 	if (udev_device == NULL)
 		return NULL;
-	if (udev_device->subsystem != NULL)
-		return udev_device->subsystem;
-
-	/* read "subsytem" link */
-	if (util_get_sys_subsystem(udev_device->udev, udev_device->syspath, subsystem, sizeof(subsystem)) > 0) {
-		udev_device->subsystem = strdup(subsystem);
-		return udev_device->subsystem;
+	if (!udev_device->subsystem_set) {
+		udev_device->subsystem_set = 1;
+		/* read "subsytem" link */
+		if (util_get_sys_subsystem(udev_device->udev, udev_device->syspath, subsystem, sizeof(subsystem)) > 0) {
+			udev_device_set_subsystem(udev_device, subsystem);
+			return udev_device->subsystem;
+		}
+		/* implicit names */
+		if (strncmp(udev_device->devpath, "/module/", 8) == 0) {
+			udev_device_set_subsystem(udev_device, "module");
+			return udev_device->subsystem;
+		}
+		if (strstr(udev_device->devpath, "/drivers/") != NULL) {
+			udev_device_set_subsystem(udev_device, "drivers");
+			return udev_device->subsystem;
+		}
+		if (strncmp(udev_device->devpath, "/subsystem/", 11) == 0 ||
+		    strncmp(udev_device->devpath, "/class/", 7) == 0 ||
+		    strncmp(udev_device->devpath, "/bus/", 5) == 0) {
+			udev_device_set_subsystem(udev_device, "subsystem");
+			return udev_device->subsystem;
+		}
 	}
+	return udev_device->subsystem;
+}
 
-	/* implicit names */
-	if (strncmp(udev_device->devpath, "/module/", 8) == 0) {
-		udev_device->subsystem = strdup("module");
-		return udev_device->subsystem;
-	}
-	if (strstr(udev_device->devpath, "/drivers/") != NULL) {
-		udev_device->subsystem = strdup("drivers");
-		return udev_device->subsystem;
-	}
-	if (strncmp(udev_device->devpath, "/subsystem/", 11) == 0 ||
-	    strncmp(udev_device->devpath, "/class/", 7) == 0 ||
-	    strncmp(udev_device->devpath, "/bus/", 5) == 0) {
-		udev_device->subsystem = strdup("subsystem");
-		return udev_device->subsystem;
+/**
+ * udev_device_get_devtype:
+ * @udev_device: udev device
+ *
+ * Retrieve the devtype string of the udev device.
+ *
+ * Returns: the devtype name of the udev device, or #NULL if it can not be determined
+ **/
+const char *udev_device_get_devtype(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return NULL;
+	if (!udev_device->devtype_set) {
+		udev_device->devtype_set = 1;
+		if (!udev_device->info_loaded)
+			udev_device_read_uevent_file(udev_device);
 	}
-	return NULL;
+	return udev_device->devtype;
 }
 
 /**
@@ -557,7 +776,13 @@ struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *
 		return NULL;
 	if (!udev_device->info_loaded)
 		device_load_info(udev_device);
-	return list_get_entry(&udev_device->devlink_list);
+	return udev_list_get_entry(&udev_device->devlinks_list);
+}
+
+void udev_device_cleanup_devlinks_list(struct udev_device *udev_device)
+{
+	udev_device->devlinks_uptodate = 0;
+	udev_list_cleanup_entries(udev_device->udev, &udev_device->devlinks_list);
 }
 
 /**
@@ -578,7 +803,22 @@ struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device
 		return NULL;
 	if (!udev_device->info_loaded)
 		device_load_info(udev_device);
-	return list_get_entry(&udev_device->properties_list);
+	if (!udev_device->devlinks_uptodate) {
+		char symlinks[UTIL_PATH_SIZE];
+		struct udev_list_entry *list_entry;
+
+		udev_device->devlinks_uptodate = 1;
+		list_entry = udev_device_get_devlinks_list_entry(udev_device);
+		if (list_entry != NULL) {
+			util_strlcpy(symlinks, udev_list_entry_get_name(list_entry), sizeof(symlinks));
+			udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry)) {
+				util_strlcat(symlinks, " ", sizeof(symlinks));
+				util_strlcat(symlinks, udev_list_entry_get_name(list_entry), sizeof(symlinks));
+			}
+			udev_device_add_property(udev_device, "DEVLINKS", symlinks);
+		}
+	}
+	return udev_list_get_entry(&udev_device->properties_list);
 }
 
 const char *udev_device_get_driver(struct udev_device *udev_device)
@@ -587,11 +827,11 @@ const char *udev_device_get_driver(struct udev_device *udev_device)
 
 	if (udev_device == NULL)
 		return NULL;
-	if (udev_device->driver != NULL)
-		return udev_device->driver;
-	if (util_get_sys_driver(udev_device->udev, udev_device->syspath, driver, sizeof(driver)) < 2)
-		return NULL;
-	udev_device->driver = strdup(driver);
+	if (!udev_device->driver_set) {
+		udev_device->driver_set = 1;
+		if (util_get_sys_driver(udev_device->udev, udev_device->syspath, driver, sizeof(driver)) > 0)
+			udev_device->driver = strdup(driver);
+	}
 	return udev_device->driver;
 }
 
@@ -618,7 +858,7 @@ unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device)
 	return udev_device->seqnum;
 }
 
-const char *udev_device_get_attr_value(struct udev_device *udev_device, const char *attr)
+const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr)
 {
 	struct udev_list_entry *list_entry;
 	char path[UTIL_PATH_SIZE];
@@ -628,37 +868,49 @@ const char *udev_device_get_attr_value(struct udev_device *udev_device, const ch
 	ssize_t size;
 	const char *val = NULL;
 
+	if (udev_device == NULL)
+		return NULL;
+	if (sysattr == NULL)
+		return NULL;
+
 	/* look for possibly already cached result */
-	udev_list_entry_foreach(list_entry, list_get_entry(&udev_device->attr_list)) {
-		if (strcmp(udev_list_entry_get_name(list_entry), attr) == 0) {
-			info(udev_device->udev, "got '%s' (%s) from cache\n", attr, udev_list_entry_get_value(list_entry));
+	udev_list_entry_foreach(list_entry, udev_list_get_entry(&udev_device->sysattr_list)) {
+		if (strcmp(udev_list_entry_get_name(list_entry), sysattr) == 0) {
+			dbg(udev_device->udev, "got '%s' (%s) from cache\n",
+			    sysattr, udev_list_entry_get_value(list_entry));
 			return udev_list_entry_get_value(list_entry);
 		}
 	}
 
 	util_strlcpy(path, udev_device_get_syspath(udev_device), sizeof(path));
 	util_strlcat(path, "/", sizeof(path));
-	util_strlcat(path, attr, sizeof(path));
+	util_strlcat(path, sysattr, sizeof(path));
 
 	if (lstat(path, &statbuf) != 0) {
-		info(udev_device->udev, "stat '%s' failed: %s\n", path, strerror(errno));
+		dbg(udev_device->udev, "no attribute '%s', keep negative entry\n", path);
+		udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, NULL, 0, 0);
 		goto out;
 	}
 
 	if (S_ISLNK(statbuf.st_mode)) {
-		/* links return the last element of the target path */
 		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;
+
 		len = readlink(path, target, sizeof(target));
 		if (len > 0) {
 			target[len] = '\0';
 			pos = strrchr(target, '/');
 			if (pos != NULL) {
 				pos = &pos[1];
-				info(udev_device->udev, "cache '%s' with link value '%s'\n", attr, pos);
-				list_entry = list_entry_add(udev_device->udev, &udev_device->attr_list, attr, pos, 0, 0);
+				dbg(udev_device->udev, "cache '%s' with link value '%s'\n", sysattr, pos);
+				list_entry = udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, pos, 0, 0);
 				val = udev_list_entry_get_value(list_entry);
 			}
 		}
@@ -676,7 +928,7 @@ const char *udev_device_get_attr_value(struct udev_device *udev_device, const ch
 	/* read attribute value */
 	fd = open(path, O_RDONLY);
 	if (fd < 0) {
-		info(udev_device->udev, "attribute '%s' can not be opened\n", path);
+		dbg(udev_device->udev, "attribute '%s' can not be opened\n", path);
 		goto out;
 	}
 	size = read(fd, value, sizeof(value));
@@ -689,109 +941,251 @@ const char *udev_device_get_attr_value(struct udev_device *udev_device, const ch
 	/* got a valid value, store it in cache and return it */
 	value[size] = '\0';
 	util_remove_trailing_chars(value, '\n');
-	info(udev_device->udev, "'%s' has attribute value '%s'\n", path, value);
-	list_entry = list_entry_add(udev_device->udev, &udev_device->attr_list, attr, value, 0, 0);
+	dbg(udev_device->udev, "'%s' has attribute value '%s'\n", path, value);
+	list_entry = udev_list_entry_add(udev_device->udev, &udev_device->sysattr_list, sysattr, value, 0, 0);
 	val = udev_list_entry_get_value(list_entry);
 out:
 	return val;
 }
-int device_set_syspath(struct udev_device *udev_device, const char *syspath)
+
+int udev_device_set_syspath(struct udev_device *udev_device, const char *syspath)
 {
 	const char *pos;
+	size_t len;
 
+	free(udev_device->syspath);
 	udev_device->syspath = strdup(syspath);
 	if (udev_device->syspath ==  NULL)
 		return -ENOMEM;
 	udev_device->devpath = &udev_device->syspath[strlen(udev_get_sys_path(udev_device->udev))];
+	udev_device_add_property(udev_device, "DEVPATH", udev_device->devpath);
+
 	pos = strrchr(udev_device->syspath, '/');
 	if (pos == NULL)
 		return -EINVAL;
-	udev_device->sysname = &pos[1];
+	udev_device->sysname = strdup(&pos[1]);
+	if (udev_device->sysname == NULL)
+		return -ENOMEM;
+
+	/* some devices have '!' in their name, change that to '/' */
+	len = 0;
+	while (udev_device->sysname[len] != '\0') {
+		if (udev_device->sysname[len] == '!')
+			udev_device->sysname[len] = '/';
+		len++;
+	}
+
+	/* trailing number */
+	while (len > 0 && isdigit(udev_device->sysname[--len]))
+		udev_device->sysnum = &udev_device->sysname[len];
+
+	/* sysname is completely numeric */
+	if (len == 0)
+		udev_device->sysnum = NULL;
+
 	return 0;
 }
 
-int device_set_subsystem(struct udev_device *udev_device, const char *subsystem)
+int udev_device_set_subsystem(struct udev_device *udev_device, const char *subsystem)
 {
+	free(udev_device->subsystem);
 	udev_device->subsystem = strdup(subsystem);
 	if (udev_device->subsystem == NULL)
-		return -1;
+		return -ENOMEM;
+	udev_device->subsystem_set = 1;
+	udev_device_add_property(udev_device, "SUBSYSTEM", udev_device->subsystem);
 	return 0;
 }
 
-int device_set_devnode(struct udev_device *udev_device, const char *devnode)
+int udev_device_set_devtype(struct udev_device *udev_device, const char *devtype)
 {
-	udev_device->devnode = strdup(devnode);
-	if (udev_device->devnode == NULL)
+	free(udev_device->devtype);
+	udev_device->devtype = strdup(devtype);
+	if (udev_device->devtype == NULL)
 		return -ENOMEM;
+	udev_device->devtype_set = 1;
+	udev_device_add_property(udev_device, "DEVTYPE", udev_device->devtype);
 	return 0;
 }
 
-int device_add_devlink(struct udev_device *udev_device, const char *devlink)
+int udev_device_set_devnode(struct udev_device *udev_device, const char *devnode)
 {
-	if (list_entry_add(udev_device->udev, &udev_device->devlink_list, devlink, NULL, 1, 0) == NULL)
+	free(udev_device->devnode);
+	udev_device->devnode = strdup(devnode);
+	if (devnode == NULL)
+		return 0;
+	if (udev_device->devnode == NULL)
 		return -ENOMEM;
+	udev_device_add_property(udev_device, "DEVNAME", udev_device->devnode);
 	return 0;
 }
 
-int device_add_property(struct udev_device *udev_device, const char *key, const char *value)
+int udev_device_add_devlink(struct udev_device *udev_device, const char *devlink)
 {
-	if (list_entry_add(udev_device->udev, &udev_device->properties_list, key, value, 1, 0) == NULL)
+	udev_device->devlinks_uptodate = 0;
+	if (udev_list_entry_add(udev_device->udev, &udev_device->devlinks_list, devlink, NULL, 1, 0) == NULL)
 		return -ENOMEM;
 	return 0;
 }
 
-int device_add_property_from_string(struct udev_device *udev_device, const char *property)
+struct udev_list_entry *udev_device_add_property(struct udev_device *udev_device, const char *key, const char *value)
+{
+	udev_device->envp_uptodate = 0;
+	if (value == NULL) {
+		struct udev_list_entry *list_entry;
+
+		list_entry = udev_device_get_properties_list_entry(udev_device);
+		list_entry = udev_list_entry_get_by_name(list_entry, key);
+		if (list_entry != NULL)
+			udev_list_entry_delete(list_entry);
+		return NULL;
+	}
+	return udev_list_entry_add(udev_device->udev, &udev_device->properties_list, key, value, 1, 0);
+}
+
+struct udev_list_entry *udev_device_add_property_from_string(struct udev_device *udev_device, const char *property)
 {
 	char name[UTIL_PATH_SIZE];
 	char *val;
 
-	strncpy(name, property, sizeof(name));
+	util_strlcpy(name, property, sizeof(name));
 	val = strchr(name, '=');
 	if (val == NULL)
-		return -1;
+		return NULL;
 	val[0] = '\0';
 	val = &val[1];
 	if (val[0] == '\0')
 		val = NULL;
-	device_add_property(udev_device, name, val);
+	return udev_device_add_property(udev_device, name, val);
+}
+
+#define ENVP_SIZE			128
+#define MONITOR_BUF_SIZE		4096
+static int update_envp_monitor_buf(struct udev_device *udev_device)
+{
+	const char *action;
+	struct udev_list_entry *list_entry;
+	size_t bufpos;
+	size_t len;
+	unsigned int i;
+
+	/* monitor buffer of property strings */
+	free(udev_device->monitor_buf);
+	udev_device->monitor_buf_len = 0;
+	udev_device->monitor_buf = malloc(MONITOR_BUF_SIZE);
+	if (udev_device->monitor_buf == NULL)
+		return -ENOMEM;
+
+	/* envp array, strings will point into monitor buffer */
+	if (udev_device->envp == NULL)
+		udev_device->envp = malloc(sizeof(char *) * ENVP_SIZE);
+	if (udev_device->envp == NULL)
+		return -ENOMEM;
+
+	/* header <action>@<devpath> */
+	action = udev_device_get_action(udev_device);
+	if (action == NULL)
+		return -EINVAL;
+	bufpos = util_strlcpy(udev_device->monitor_buf, action, MONITOR_BUF_SIZE);
+	len = util_strlcpy(&udev_device->monitor_buf[bufpos], "@", MONITOR_BUF_SIZE-bufpos);
+	if (len >= MONITOR_BUF_SIZE-bufpos)
+		return -EINVAL;
+	bufpos += len;
+	len = util_strlcpy(&udev_device->monitor_buf[bufpos],
+			   udev_device_get_devpath(udev_device),
+			   MONITOR_BUF_SIZE-bufpos);
+	if (len+1 >= MONITOR_BUF_SIZE-bufpos)
+		return -EINVAL;
+	bufpos += len+1;
+
+	i = 0;
+	udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
+		/* add string to envp array */
+		udev_device->envp[i++] = &udev_device->monitor_buf[bufpos];
+		if (i+1 >= ENVP_SIZE)
+			return -EINVAL;
+
+		/* add property string to monitor buffer */
+		len = util_strlcpy(&udev_device->monitor_buf[bufpos],
+				   udev_list_entry_get_name(list_entry), MONITOR_BUF_SIZE-bufpos);
+		if (len >= MONITOR_BUF_SIZE-bufpos)
+			return -EINVAL;
+		bufpos += len;
+		len = util_strlcpy(&udev_device->monitor_buf[bufpos], "=", MONITOR_BUF_SIZE-bufpos);
+		if (len >= MONITOR_BUF_SIZE-bufpos)
+			return -EINVAL;
+		bufpos += len;
+		len = util_strlcpy(&udev_device->monitor_buf[bufpos], udev_list_entry_get_value(list_entry),
+				   MONITOR_BUF_SIZE-bufpos);
+		if (len+1 >= MONITOR_BUF_SIZE-bufpos)
+			return -EINVAL;
+		bufpos += len+1;
+	}
+	udev_device->envp[i] = NULL;
+	udev_device->monitor_buf_len = bufpos;
+	udev_device->envp_uptodate = 1;
+	dbg(udev_device->udev, "filled envp/monitor buffer, %u properties, %zu bytes\n", i, bufpos);
 	return 0;
 }
 
-int device_set_action(struct udev_device *udev_device, const char *action)
+char **udev_device_get_properties_envp(struct udev_device *udev_device)
+{
+	if (!udev_device->envp_uptodate)
+		if (update_envp_monitor_buf(udev_device) != 0)
+			return NULL;
+	return udev_device->envp;
+}
+
+ssize_t udev_device_get_properties_monitor_buf(struct udev_device *udev_device, const char **buf)
 {
+	if (!udev_device->envp_uptodate)
+		if (update_envp_monitor_buf(udev_device) != 0)
+			return -EINVAL;
+	*buf = udev_device->monitor_buf;
+	return udev_device->monitor_buf_len;
+}
+
+int udev_device_set_action(struct udev_device *udev_device, const char *action)
+{
+	free(udev_device->action);
 	udev_device->action = strdup(action);
 	if (udev_device->action == NULL)
 		return -ENOMEM;
+	udev_device_add_property(udev_device, "ACTION", udev_device->action);
 	return 0;
 }
 
-int device_set_driver(struct udev_device *udev_device, const char *driver)
+int udev_device_set_driver(struct udev_device *udev_device, const char *driver)
 {
+	free(udev_device->driver);
 	udev_device->driver = strdup(driver);
 	if (udev_device->driver == NULL)
 		return -ENOMEM;
+	udev_device->driver_set = 1;
+	udev_device_add_property(udev_device, "DRIVER", udev_device->driver);
 	return 0;
 }
 
-const char *device_get_devpath_old(struct udev_device *udev_device)
+const char *udev_device_get_devpath_old(struct udev_device *udev_device)
 {
 	return udev_device->devpath_old;
 }
 
-int device_set_devpath_old(struct udev_device *udev_device, const char *devpath_old)
+int udev_device_set_devpath_old(struct udev_device *udev_device, const char *devpath_old)
 {
 	udev_device->devpath_old = strdup(devpath_old);
 	if (udev_device->devpath_old == NULL)
 		return -ENOMEM;
+	udev_device_add_property(udev_device, "DEVPATH_OLD", udev_device->devpath_old);
 	return 0;
 }
 
-const char *device_get_physdevpath(struct udev_device *udev_device)
+const char *udev_device_get_physdevpath(struct udev_device *udev_device)
 {
 	return udev_device->physdevpath;
 }
 
-int device_set_physdevpath(struct udev_device *udev_device, const char *physdevpath)
+int udev_device_set_physdevpath(struct udev_device *udev_device, const char *physdevpath)
 {
 	udev_device->physdevpath = strdup(physdevpath);
 	if (udev_device->physdevpath == NULL)
@@ -799,77 +1193,87 @@ int device_set_physdevpath(struct udev_device *udev_device, const char *physdevp
 	return 0;
 }
 
-int device_get_timeout(struct udev_device *udev_device)
+int udev_device_get_timeout(struct udev_device *udev_device)
 {
 	return udev_device->timeout;
 }
 
-int device_set_timeout(struct udev_device *udev_device, int timeout)
+int udev_device_set_timeout(struct udev_device *udev_device, int timeout)
 {
 	udev_device->timeout = timeout;
 	return 0;
 }
-int device_get_event_timeout(struct udev_device *udev_device)
+int udev_device_get_event_timeout(struct udev_device *udev_device)
 {
 	if (!udev_device->info_loaded)
 		device_load_info(udev_device);
 	return udev_device->event_timeout;
 }
 
-int device_set_event_timeout(struct udev_device *udev_device, int event_timeout)
+int udev_device_set_event_timeout(struct udev_device *udev_device, int event_timeout)
 {
 	udev_device->event_timeout = event_timeout;
 	return 0;
 }
 
-int device_set_seqnum(struct udev_device *udev_device, unsigned long long int seqnum)
+int udev_device_set_seqnum(struct udev_device *udev_device, unsigned long long int seqnum)
 {
+	char num[32];
+
 	udev_device->seqnum = seqnum;
+	snprintf(num, sizeof(num), "%llu", seqnum);
+	udev_device_add_property(udev_device, "SEQNUM", num);
 	return 0;
 }
 
-int device_set_devnum(struct udev_device *udev_device, dev_t devnum)
+int udev_device_set_devnum(struct udev_device *udev_device, dev_t devnum)
 {
+	char num[32];
+
 	udev_device->devnum = devnum;
+
+	snprintf(num, sizeof(num), "%u", major(devnum));
+	udev_device_add_property(udev_device, "MAJOR", num);
+	snprintf(num, sizeof(num), "%u", minor(devnum));
+	udev_device_add_property(udev_device, "MINOR", num);
 	return 0;
 }
 
-int device_get_num_fake_partitions(struct udev_device *udev_device)
+int udev_device_get_num_fake_partitions(struct udev_device *udev_device)
 {
 	if (!udev_device->info_loaded)
 		device_load_info(udev_device);
 	return udev_device->num_fake_partitions;
 }
 
-int device_set_num_fake_partitions(struct udev_device *udev_device, int num)
+int udev_device_set_num_fake_partitions(struct udev_device *udev_device, int num)
 {
 	udev_device->num_fake_partitions = num;
 	return 0;
 }
 
-int device_get_devlink_priority(struct udev_device *udev_device)
+int udev_device_get_devlink_priority(struct udev_device *udev_device)
 {
 	if (!udev_device->info_loaded)
 		device_load_info(udev_device);
 	return udev_device->devlink_priority;
 }
 
-int device_set_devlink_priority(struct udev_device *udev_device, int prio)
+int udev_device_set_devlink_priority(struct udev_device *udev_device, int prio)
 {
 	 udev_device->devlink_priority = prio;
 	return 0;
 }
 
-int device_get_ignore_remove(struct udev_device *udev_device)
+int udev_device_get_ignore_remove(struct udev_device *udev_device)
 {
 	if (!udev_device->info_loaded)
 		device_load_info(udev_device);
 	return udev_device->ignore_remove;
 }
 
-int device_set_ignore_remove(struct udev_device *udev_device, int ignore)
+int udev_device_set_ignore_remove(struct udev_device *udev_device, int ignore)
 {
 	udev_device->ignore_remove = ignore;
 	return 0;
 }
-