libudev: move to top-level directory

1 files changed, 1249 insertions, 0 deletions

diff --git a/libudev/libudev-device.c b/libudev/libudev-device.c
new file mode 100644
index 0000000000..ea54badde4
--- /dev/null
+++ b/libudev/libudev-device.c
@@ -0,0 +1,1249 @@
+/*
+ * libudev - interface to udev device information
+ *
+ * Copyright (C) 2008-2009 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <errno.h>
+#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 {
+	struct udev *udev;
+	struct udev_device *parent_device;
+	char *syspath;
+	const char *devpath;
+	char *sysname;
+	const char *sysnum;
+	char *devnode;
+	char *subsystem;
+	char *devtype;
+	char *driver;
+	char *action;
+	char *devpath_old;
+	char *knodename;
+	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 refcount;
+	dev_t devnum;
+	int watch_handle;
+	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 devpath_to_db_path(struct udev *udev, const char *devpath, char *filename, size_t len)
+{
+	char *s;
+	size_t l;
+
+	s = filename;
+	l = util_strpcpyl(&s, len, udev_get_dev_path(udev), "/.udev/db/", NULL);
+	return util_path_encode(devpath, s, l);
+}
+
+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;
+
+	devpath_to_db_path(udev_device->udev, udev_device->devpath, filename, sizeof(filename));
+
+	if (lstat(filename, &stats) != 0) {
+		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 {
+			dbg(udev_device->udev, "error reading db link %s: %m\n", filename);
+			return -1;
+		}
+
+		next = strchr(target, ' ');
+		if (next != NULL) {
+			next[0] = '\0';
+			next = &next[1];
+		}
+		util_strscpyl(devnode, sizeof(devnode), udev_get_dev_path(udev_device->udev), "/", target, NULL);
+		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_strscpyl(devlink, sizeof(devlink), udev_get_dev_path(udev_device->udev), "/", lnk, NULL);
+			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) {
+		dbg(udev_device->udev, "error reading db file %s: %m\n", filename);
+		return -1;
+	}
+	while (fgets(line, sizeof(line), f)) {
+		ssize_t len;
+		const char *val;
+
+		len = strlen(line);
+		if (len < 4)
+			break;
+		line[len-1] = '\0';
+		val = &line[2];
+		switch(line[0]) {
+		case 'N':
+			util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_device->udev), "/", val, NULL);
+			udev_device_set_devnode(udev_device, filename);
+			break;
+		case 'S':
+			util_strscpyl(filename, sizeof(filename), udev_get_dev_path(udev_device->udev), "/", val, NULL);
+			udev_device_add_devlink(udev_device, filename);
+			break;
+		case 'L':
+			udev_device_set_devlink_priority(udev_device, atoi(val));
+			break;
+		case 'T':
+			udev_device_set_event_timeout(udev_device, atoi(val));
+			break;
+		case 'A':
+			udev_device_set_num_fake_partitions(udev_device, atoi(val));
+			break;
+		case 'R':
+			udev_device_set_ignore_remove(udev_device, atoi(val));
+			break;
+		case 'E':
+			udev_device_add_property_from_string(udev_device, val);
+			break;
+		case 'W':
+			udev_device_set_watch_handle(udev_device, atoi(val));
+			break;
+		}
+	}
+	fclose(f);
+
+	info(udev_device->udev, "device %p filled with db file data\n", udev_device);
+	return 0;
+}
+
+int udev_device_read_uevent_file(struct udev_device *udev_device)
+{
+	char filename[UTIL_PATH_SIZE];
+	FILE *f;
+	char line[UTIL_LINE_SIZE];
+	int maj = 0;
+	int min = 0;
+
+	util_strscpyl(filename, sizeof(filename), udev_device->syspath, "/uevent", NULL);
+	f = fopen(filename, "r");
+	if (f == NULL)
+		return -1;
+
+	while (fgets(line, sizeof(line), f)) {
+		char *pos;
+
+		pos = strchr(line, '\n');
+		if (pos == NULL)
+			continue;
+		pos[0] = '\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);
+		else if (strncmp(line, "DEVNAME=", 8) == 0)
+			udev_device_set_knodename(udev_device, &line[8]);
+
+		udev_device_add_property_from_string(udev_device, line);
+	}
+
+	udev_device->devnum = makedev(maj, min);
+
+	fclose(f);
+	return 0;
+}
+
+static void device_load_info(struct udev_device *device)
+{
+	device->info_loaded = 1;
+	udev_device_read_uevent_file(device);
+	udev_device_read_db(device);
+}
+
+void udev_device_set_info_loaded(struct udev_device *device)
+{
+	device->info_loaded = 1;
+}
+
+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 = calloc(1, sizeof(struct udev_device));
+	if (udev_device == NULL)
+		return NULL;
+	udev_device->refcount = 1;
+	udev_device->udev = udev;
+	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;
+	udev_device->watch_handle = -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;
+}
+
+/**
+ * udev_device_new_from_syspath:
+ * @udev: udev library context
+ * @syspath: sys device path including sys directory
+ *
+ * Create new udev device, and fill in information from the sys
+ * device and the udev database entry. The sypath is the absolute
+ * path to the device, including the sys mount point.
+ *
+ * The initial refcount is 1, and needs to be decremented to
+ * release the resources of the udev device.
+ *
+ * Returns: a new udev device, or #NULL, if it does not exist
+ **/
+struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
+{
+	size_t len;
+	const char *subdir;
+	char path[UTIL_PATH_SIZE];
+	char *pos;
+	struct stat statbuf;
+	struct udev_device *udev_device;
+
+	if (udev == NULL)
+		return NULL;
+	if (syspath == NULL)
+		return NULL;
+
+	/* path starts in sys */
+	len = strlen(udev_get_sys_path(udev));
+	if (strncmp(syspath, udev_get_sys_path(udev), len) != 0) {
+		info(udev, "not in sys :%s\n", syspath);
+		return NULL;
+	}
+
+	/* path is not a root directory */
+	subdir = &syspath[len+1];
+	pos = strrchr(subdir, '/');
+	if (pos == NULL || pos[1] == '\0' || pos < &subdir[2]) {
+		dbg(udev, "not a subdir :%s\n", syspath);
+		return NULL;
+	}
+
+	/* resolve possible symlink to real path */
+	util_strscpy(path, sizeof(path), syspath);
+	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_strscpy(block, sizeof(block), path);
+		pos = strrchr(block, '/');
+		if (pos == NULL)
+			return NULL;
+		util_strscpy(part, sizeof(part), pos);
+		pos[0] = '\0';
+		if (util_resolve_sys_link(udev, block, sizeof(block)) == 0)
+			util_strscpyl(path, sizeof(path), block, part, NULL);
+	}
+
+	/* path exists in sys */
+	if (strncmp(&syspath[len], "/devices/", 9) == 0 ||
+	    strncmp(&syspath[len], "/class/", 7) == 0 ||
+	    strncmp(&syspath[len], "/block/", 7) == 0) {
+		char file[UTIL_PATH_SIZE];
+
+		/* all "devices" require a "uevent" file */
+		util_strscpyl(file, sizeof(file), path, "/uevent", NULL);
+		if (stat(file, &statbuf) != 0) {
+			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)) {
+			dbg(udev, "directory not found: %s\n", syspath);
+			return NULL;
+		}
+	}
+
+	udev_device = device_new(udev);
+	if (udev_device == NULL)
+		return NULL;
+
+	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;
+}
+
+struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum)
+{
+	char path[UTIL_PATH_SIZE];
+	const char *type_str;
+	struct udev_enumerate *udev_enumerate;
+	struct udev_list_entry *list_entry;
+	struct udev_device *device = NULL;
+
+	if (type == 'b')
+		type_str = "block";
+	else if (type == 'c')
+		type_str = "char";
+	else
+		return NULL;
+
+	/* /sys/dev/{block,char}/<maj>:<min> link */
+	snprintf(path, sizeof(path), "%s/dev/%s/%u:%u", udev_get_sys_path(udev),
+		 type_str, major(devnum), minor(devnum));
+	if (util_resolve_sys_link(udev, path, sizeof(path)) == 0)
+		return udev_device_new_from_syspath(udev, path);
+
+	udev_enumerate = udev_enumerate_new(udev);
+	if (udev_enumerate == NULL)
+		return NULL;
+
+	/* 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(udev_enumerate);
+	return device;
+}
+
+struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname)
+{
+	char path_full[UTIL_PATH_SIZE];
+	char *path;
+	size_t l;
+	struct stat statbuf;
+
+	path = path_full;
+	l = util_strpcpyl(&path, sizeof(path_full), udev_get_sys_path(udev), NULL);
+
+	if (strcmp(subsystem, "subsystem") == 0) {
+		util_strscpyl(path, l, "/subsystem/", sysname, NULL);
+		if (stat(path_full, &statbuf) == 0)
+			goto found;
+
+		util_strscpyl(path, l, "/bus/", sysname, NULL);
+		if (stat(path_full, &statbuf) == 0)
+			goto found;
+
+		util_strscpyl(path, l, "/class/", sysname, NULL);
+		if (stat(path_full, &statbuf) == 0)
+			goto found;
+		goto out;
+	}
+
+	if (strcmp(subsystem, "module") == 0) {
+		util_strscpyl(path, l, "/module/", sysname, NULL);
+		if (stat(path_full, &statbuf) == 0)
+			goto found;
+		goto out;
+	}
+
+	if (strcmp(subsystem, "drivers") == 0) {
+		char subsys[UTIL_NAME_SIZE];
+		char *driver;
+
+		util_strscpy(subsys, sizeof(subsys), sysname);
+		driver = strchr(subsys, ':');
+		if (driver != NULL) {
+			driver[0] = '\0';
+			driver = &driver[1];
+
+			util_strscpyl(path, l, "/subsystem/", subsys, "/drivers/", driver, NULL);
+			if (stat(path_full, &statbuf) == 0)
+				goto found;
+
+			util_strscpyl(path, l, "/bus/", subsys, "/drivers/", driver, NULL);
+			if (stat(path_full, &statbuf) == 0)
+				goto found;
+		}
+		goto out;
+	}
+
+	util_strscpyl(path, l, "/subsystem/", subsystem, "/devices/", sysname, NULL);
+	if (stat(path_full, &statbuf) == 0)
+		goto found;
+
+	util_strscpyl(path, l, "/bus/", subsystem, "/devices/", sysname, NULL);
+	if (stat(path_full, &statbuf) == 0)
+		goto found;
+
+	util_strscpyl(path, l, "/class/", subsystem, "/", sysname, NULL);
+	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;
+	char path[UTIL_PATH_SIZE];
+	const char *subdir;
+
+	/* follow "device" link in deprecated sys layout */
+	if (strncmp(udev_device->devpath, "/class/", 7) == 0 ||
+	    strncmp(udev_device->devpath, "/block/", 7) == 0) {
+		util_strscpyl(path, sizeof(path), udev_device->syspath, "/device", NULL);
+		if (util_resolve_sys_link(udev_device->udev, path, sizeof(path)) == 0) {
+			udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
+			if (udev_device_parent != NULL)
+				return udev_device_parent;
+		}
+	}
+
+	util_strscpy(path, sizeof(path), udev_device->syspath);
+	subdir = &path[strlen(udev_get_sys_path(udev_device->udev))+1];
+	while (1) {
+		char *pos;
+
+		pos = strrchr(subdir, '/');
+		if (pos == NULL || pos < &subdir[2])
+			break;
+		pos[0] = '\0';
+		udev_device_parent = udev_device_new_from_syspath(udev_device->udev, path);
+		if (udev_device_parent != NULL)
+			return udev_device_parent;
+	}
+	return NULL;
+}
+
+struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return NULL;
+	if (!udev_device->parent_set) {
+		udev_device->parent_set = 1;
+		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
+ *
+ * Retrieve the udev library context the device was created with.
+ *
+ * Returns: the udev library context
+ **/
+struct udev *udev_device_get_udev(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return NULL;
+	return udev_device->udev;
+}
+
+/**
+ * udev_device_ref:
+ * @udev_device: udev device
+ *
+ * Take a reference of a udev device.
+ *
+ * Returns: the passed udev device
+ **/
+struct udev_device *udev_device_ref(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return NULL;
+	udev_device->refcount++;
+	return udev_device;
+}
+
+/**
+ * udev_device_unref:
+ * @udev_device: udev device
+ *
+ * Drop a reference of a udev device. If the refcount reaches zero,
+ * the resources of the device will be released.
+ *
+ **/
+void udev_device_unref(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return;
+	udev_device->refcount--;
+	if (udev_device->refcount > 0)
+		return;
+	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);
+	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->knodename);
+	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);
+}
+
+/**
+ * udev_device_get_devpath:
+ * @udev_device: udev device
+ *
+ * Retrieve the kernel devpath value of the udev device. The path
+ * does not contain the sys mount point, and starts with a '/'.
+ *
+ * Returns: the devpath of the udev device
+ **/
+const char *udev_device_get_devpath(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return NULL;
+	return udev_device->devpath;
+}
+
+/**
+ * udev_device_get_syspath:
+ * @udev_device: udev device
+ *
+ * Retrieve the sys path of the udev device. The path is an
+ * absolute path and starts with the sys mount point.
+ *
+ * Returns: the sys path of the udev device
+ **/
+const char *udev_device_get_syspath(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return NULL;
+	return udev_device->syspath;
+}
+
+const char *udev_device_get_sysname(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return NULL;
+	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
+ *
+ * Retrieve the device node file name belonging to the udev device.
+ * The path is an absolute path, and starts with the device directory.
+ *
+ * Returns: the device node file name of the udev device, or #NULL if no device node exists
+ **/
+const char *udev_device_get_devnode(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return NULL;
+	if (!udev_device->info_loaded)
+		device_load_info(udev_device);
+	return udev_device->devnode;
+}
+
+/**
+ * udev_device_get_subsystem:
+ * @udev_device: udev device
+ *
+ * Retrieve the subsystem string of the udev device. The string does not
+ * contain any "/".
+ *
+ * Returns: the subsystem name of the udev device, or #NULL if it can not be determined
+ **/
+const char *udev_device_get_subsystem(struct udev_device *udev_device)
+{
+	char subsystem[UTIL_NAME_SIZE];
+
+	if (udev_device == NULL)
+		return NULL;
+	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;
+}
+
+/**
+ * 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 udev_device->devtype;
+}
+
+/**
+ * udev_device_get_devlinks_list_entry:
+ * @udev_device: udev device
+ *
+ * Retrieve the list of device links pointing to the device file of
+ * the udev device. The next list entry can be retrieved with
+ * udev_list_entry_next(), which returns #NULL if no more entries exist.
+ * The devlink path can be retrieved from the list entry by
+ * udev_list_entry_get_name(). The path is an absolute path, and starts with
+ * the device directory.
+ *
+ * Returns: the first entry of the device node link list
+ **/
+struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return NULL;
+	if (!udev_device->info_loaded)
+		device_load_info(udev_device);
+	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);
+}
+
+/**
+ * udev_device_get_properties_list_entry:
+ * @udev_device: udev device
+ *
+ * Retrieve the list of key/value device properties of the udev
+ * device. The next list entry can be retrieved with udev_list_entry_next(),
+ * which returns #NULL if no more entries exist. The property name
+ * can be retrieved from the list entry by udev_list_get_name(),
+ * the property value by udev_list_get_value().
+ *
+ * Returns: the first entry of the property list
+ **/
+struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return NULL;
+	if (!udev_device->info_loaded)
+		device_load_info(udev_device);
+	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) {
+			char *s;
+			size_t l;
+
+			s = symlinks;
+			l = util_strpcpyl(&s, sizeof(symlinks), udev_list_entry_get_name(list_entry), NULL);
+			udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
+				l = util_strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry), NULL);
+			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)
+{
+	char driver[UTIL_NAME_SIZE];
+
+	if (udev_device == NULL)
+		return NULL;
+	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;
+}
+
+dev_t udev_device_get_devnum(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return makedev(0, 0);
+	if (!udev_device->info_loaded)
+		device_load_info(udev_device);
+	return udev_device->devnum;
+}
+
+const char *udev_device_get_action(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return NULL;
+	return udev_device->action;
+}
+
+unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device)
+{
+	if (udev_device == NULL)
+		return 0;
+	return udev_device->seqnum;
+}
+
+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];
+	char value[4096];
+	struct stat statbuf;
+	int fd;
+	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, 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_strscpyl(path, sizeof(path), udev_device_get_syspath(udev_device), "/", sysattr, NULL);
+	if (lstat(path, &statbuf) != 0) {
+		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)) {
+		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];
+				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);
+			}
+		}
+		goto out;
+	}
+
+	/* skip directories */
+	if (S_ISDIR(statbuf.st_mode))
+		goto out;
+
+	/* skip non-readable files */
+	if ((statbuf.st_mode & S_IRUSR) == 0)
+		goto out;
+
+	/* read attribute value */
+	fd = open(path, O_RDONLY);
+	if (fd < 0) {
+		dbg(udev_device->udev, "attribute '%s' can not be opened\n", path);
+		goto out;
+	}
+	size = read(fd, value, sizeof(value));
+	close(fd);
+	if (size < 0)
+		goto out;
+	if (size == sizeof(value))
+		goto out;
+
+	/* got a valid value, store it in cache and return it */
+	value[size] = '\0';
+	util_remove_trailing_chars(value, '\n');
+	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 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 = 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 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 -ENOMEM;
+	udev_device->subsystem_set = 1;
+	udev_device_add_property(udev_device, "SUBSYSTEM", udev_device->subsystem);
+	return 0;
+}
+
+int udev_device_set_devtype(struct udev_device *udev_device, const char *devtype)
+{
+	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 udev_device_set_devnode(struct udev_device *udev_device, const char *devnode)
+{
+	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 udev_device_add_devlink(struct udev_device *udev_device, const char *devlink)
+{
+	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;
+}
+
+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;
+
+	util_strscpy(name, sizeof(name), property);
+	val = strchr(name, '=');
+	if (val == NULL)
+		return NULL;
+	val[0] = '\0';
+	val = &val[1];
+	if (val[0] == '\0')
+		val = NULL;
+	return udev_device_add_property(udev_device, name, val);
+}
+
+const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key)
+{
+	struct udev_list_entry *list_entry;
+
+	if (udev_device == NULL)
+		return NULL;
+	if (key == NULL)
+		return NULL;
+
+	list_entry = udev_device_get_properties_list_entry(udev_device);
+	list_entry =  udev_list_entry_get_by_name(list_entry, key);
+	return udev_list_entry_get_value(list_entry);
+}
+
+#define ENVP_SIZE			128
+#define MONITOR_BUF_SIZE		4096
+static int update_envp_monitor_buf(struct udev_device *udev_device)
+{
+	struct udev_list_entry *list_entry;
+	char *s;
+	size_t l;
+	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;
+
+	i = 0;
+	s = udev_device->monitor_buf;
+	l = MONITOR_BUF_SIZE;
+	udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
+		/* add string to envp array */
+		udev_device->envp[i++] = s;
+		if (i+1 >= ENVP_SIZE)
+			return -EINVAL;
+
+		/* add property string to monitor buffer */
+		l = util_strpcpyl(&s, l, udev_list_entry_get_name(list_entry), "=",
+				  udev_list_entry_get_value(list_entry), NULL);
+		if (l == 0)
+			return -EINVAL;
+		s++;
+	}
+	udev_device->envp[i] = NULL;
+	udev_device->monitor_buf_len = s - udev_device->monitor_buf;
+	udev_device->envp_uptodate = 1;
+	dbg(udev_device->udev, "filled envp/monitor buffer, %u properties, %zu bytes\n",
+	    i, udev_device->monitor_buf_len);
+	return 0;
+}
+
+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 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 *udev_device_get_devpath_old(struct udev_device *udev_device)
+{
+	return udev_device->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 *udev_device_get_knodename(struct udev_device *udev_device)
+{
+	return udev_device->knodename;
+}
+
+int udev_device_set_knodename(struct udev_device *udev_device, const char *knodename)
+{
+	udev_device->knodename = strdup(knodename);
+	if (udev_device->knodename == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+int udev_device_get_timeout(struct udev_device *udev_device)
+{
+	return udev_device->timeout;
+}
+
+int udev_device_set_timeout(struct udev_device *udev_device, int timeout)
+{
+	udev_device->timeout = timeout;
+	return 0;
+}
+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 udev_device_set_event_timeout(struct udev_device *udev_device, int event_timeout)
+{
+	udev_device->event_timeout = event_timeout;
+	return 0;
+}
+
+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 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 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 udev_device_set_num_fake_partitions(struct udev_device *udev_device, int num)
+{
+	udev_device->num_fake_partitions = num;
+	return 0;
+}
+
+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 udev_device_set_devlink_priority(struct udev_device *udev_device, int prio)
+{
+	 udev_device->devlink_priority = prio;
+	return 0;
+}
+
+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 udev_device_set_ignore_remove(struct udev_device *udev_device, int ignore)
+{
+	udev_device->ignore_remove = ignore;
+	return 0;
+}
+
+int udev_device_get_watch_handle(struct udev_device *udev_device)
+{
+	if (!udev_device->info_loaded)
+		device_load_info(udev_device);
+	return udev_device->watch_handle;
+}
+
+int udev_device_set_watch_handle(struct udev_device *udev_device, int handle)
+{
+	udev_device->watch_handle = handle;
+	return 0;
+}