[PATCH] libsysfs: version 2.0

libsysfs/dlist.c

@@ -551,7 +551,7 @@ void dlist_sort_custom(struct dlist *list, int (*compare)(void *, void *))
   struct dlist *templist;
   unsigned int passcount = 1;
   unsigned int mergecount = 1;
-
+  
   dlist_start(list);
   templist = dlist_new(list->data_size);
 

libsysfs/sysfs.h

@@ -3,7 +3,7 @@
  *
  * Internal Header Definitions for libsysfs
  *
- * Copyright (C) IBM Corp. 2003
+ * Copyright (C) IBM Corp. 2003-2005
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public

libsysfs/sysfs/dlist.h

@@ -50,6 +50,7 @@
 
 * Just use the dlist_(insert|delete)_(before|after) macros if you do not want
 * to think about it.
+
 */
 
 #include <stddef.h>

libsysfs/sysfs/libsysfs.h

@@ -184,6 +184,21 @@ extern struct dlist *sysfs_get_classdev_attributes
 	(struct sysfs_class_device *clsdev);
 extern struct sysfs_device *sysfs_get_classdev_device
 	(struct sysfs_class_device *clsdev);
+extern void sysfs_close_class(struct sysfs_class *cls);
+extern struct sysfs_class *sysfs_open_class(const char *name);
+extern struct sysfs_class_device *sysfs_get_class_device
+	(struct sysfs_class *cls, const char *name);
+extern struct dlist *sysfs_get_class_devices(struct sysfs_class *cls);
+
+/* generic sysfs bus access */
+extern void sysfs_close_bus(struct sysfs_bus *bus);
+extern struct sysfs_bus *sysfs_open_bus(const char *name);
+extern struct dlist *sysfs_get_bus_devices(struct sysfs_bus *bus);
+extern struct dlist *sysfs_get_bus_drivers(struct sysfs_bus *bus);
+extern struct sysfs_device *sysfs_get_bus_device
+	(struct sysfs_bus *bus, const char *id);
+extern struct sysfs_driver *sysfs_get_bus_driver
+	(struct sysfs_bus *bus, const char *drvname);
 
 /**
  * sort_list: sorter function to keep list elements sorted in alphabetical 

libsysfs/sysfs_bus.c

@@ -0,0 +1,317 @@
+/*
+ * sysfs_bus.c
+ *
+ * Generic bus utility functions for libsysfs
+ *
+ * Copyright (C) IBM Corp. 2003-2005
+ *
+ *  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.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#include "libsysfs.h"
+#include "sysfs.h"
+
+static void sysfs_close_dev(void *dev)
+{
+        sysfs_close_device((struct sysfs_device *)dev);
+}
+
+static void sysfs_close_drv(void *drv)
+{
+        sysfs_close_driver((struct sysfs_driver *)drv);
+}
+
+/*
+ * compares names.
+ * @a: name looked for
+ * @b: sysfs_device comparing being compared
+ * returns 1 if a==b->name or 0 not equal
+ */
+static int name_equal(void *a, void *b)
+{
+	if (!a || !b)
+		return 0;
+
+	if (strcmp(((char *)a), ((struct sysfs_device *)b)->name) == 0)
+		return 1;
+
+	return 0;
+}
+
+/**
+ * sysfs_close_bus: close single bus
+ * @bus: bus structure
+ */
+void sysfs_close_bus(struct sysfs_bus *bus)
+{
+	if (bus) {
+		if (bus->attrlist)
+			dlist_destroy(bus->attrlist);
+		if (bus->devices)
+			dlist_destroy(bus->devices);
+		if (bus->drivers)
+			dlist_destroy(bus->drivers);
+		free(bus);
+	}
+}
+
+/**
+ * alloc_bus: mallocs new bus structure
+ * returns sysfs_bus_bus struct or NULL
+ */
+static struct sysfs_bus *alloc_bus(void)
+{
+	return (struct sysfs_bus *)calloc(1, sizeof(struct sysfs_bus));
+}
+
+/**
+ * sysfs_get_bus_devices: gets all devices for bus
+ * @bus: bus to get devices for
+ * returns dlist of devices with success and NULL with failure
+ */
+struct dlist *sysfs_get_bus_devices(struct sysfs_bus *bus)
+{
+	struct sysfs_device *dev;
+	struct dlist *linklist;
+	char path[SYSFS_PATH_MAX], devpath[SYSFS_PATH_MAX];
+	char target[SYSFS_PATH_MAX];
+	char *curlink;
+
+	if (!bus) {
+		errno = EINVAL;
+		return NULL;
+	}
+	memset(path, 0, SYSFS_PATH_MAX);
+	safestrcpy(path, bus->path);
+	safestrcat(path, "/");
+	safestrcat(path, SYSFS_DEVICES_NAME);
+
+	linklist = read_dir_links(path);
+	if (linklist) {
+		dlist_for_each_data(linklist, curlink, char) {
+			if (bus->devices) {
+				dev = (struct sysfs_device *)
+					dlist_find_custom(bus->devices,
+					(void *)curlink, name_equal);
+				if (dev)
+					continue;
+			}
+			safestrcpy(devpath, path);
+			safestrcat(devpath, "/");
+			safestrcat(devpath, curlink);
+			if (sysfs_get_link(devpath, target, SYSFS_PATH_MAX)) {
+				dprintf("Error getting link - %s\n", devpath);
+				continue;
+			}
+			dev = sysfs_open_device_path(target);
+			if (!dev) {
+				dprintf("Error opening device at %s\n",	
+								target);
+				continue;
+			}
+			if (!bus->devices)
+				bus->devices = dlist_new_with_delete
+					(sizeof(struct sysfs_device), 
+					 		sysfs_close_dev);
+			dlist_unshift_sorted(bus->devices, dev, sort_list);
+		}
+		sysfs_close_list(linklist);
+	}
+	return (bus->devices);
+}
+
+/**
+ * sysfs_get_bus_drivers: gets all drivers for bus
+ * @bus: bus to get devices for
+ * returns dlist of devices with success and NULL with failure
+ */
+struct dlist *sysfs_get_bus_drivers(struct sysfs_bus *bus)
+{
+	struct sysfs_driver *drv;
+	struct dlist *dirlist;
+	char path[SYSFS_PATH_MAX], drvpath[SYSFS_PATH_MAX];
+	char *curdir;
+
+	if (!bus) {
+		errno = EINVAL;
+		return NULL;
+	}
+	memset(path, 0, SYSFS_PATH_MAX);
+	safestrcpy(path, bus->path);
+	safestrcat(path, "/");
+	safestrcat(path, SYSFS_DRIVERS_NAME);
+
+	dirlist = read_dir_subdirs(path);
+	if (dirlist) {
+		dlist_for_each_data(dirlist, curdir, char) {
+			if (bus->drivers) {
+				drv = (struct sysfs_driver *)
+					dlist_find_custom(bus->drivers,
+					(void *)curdir, name_equal);
+				if (drv)
+					continue;
+			}
+			safestrcpy(drvpath, path);
+			safestrcat(drvpath, "/");
+			safestrcat(drvpath, curdir);
+			drv = sysfs_open_driver_path(drvpath);
+			if (!drv) {
+				dprintf("Error opening driver at %s\n",	
+								drvpath);
+				continue;
+			}
+			if (!bus->drivers)
+				bus->drivers = dlist_new_with_delete
+					(sizeof(struct sysfs_driver), 
+					 		sysfs_close_drv);
+			dlist_unshift_sorted(bus->drivers, drv, sort_list);
+		}
+		sysfs_close_list(dirlist);
+	}
+	return (bus->drivers);
+}
+
+/**
+ * sysfs_open_bus: opens specific bus and all its devices on system
+ * returns sysfs_bus structure with success or NULL with error.
+ */
+struct sysfs_bus *sysfs_open_bus(const char *name)
+{
+	struct sysfs_bus *bus;
+	char buspath[SYSFS_PATH_MAX];
+
+	if (!name) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	memset(buspath, 0, SYSFS_PATH_MAX);
+	if (sysfs_get_mnt_path(buspath, SYSFS_PATH_MAX)) {
+		dprintf("Sysfs not supported on this system\n");
+		return NULL;
+	}
+
+	safestrcat(buspath, "/");
+	safestrcat(buspath, SYSFS_BUS_NAME);
+	safestrcat(buspath, "/");
+	safestrcat(buspath, name);
+	if (sysfs_path_is_dir(buspath)) {
+		dprintf("Invalid path to bus: %s\n", buspath);
+		return NULL;
+	}
+	bus = alloc_bus();
+	if (!bus) {
+		dprintf("calloc failed\n");
+		return NULL;
+	}
+	safestrcpy(bus->name, name);	
+	safestrcpy(bus->path, buspath);
+	if (sysfs_remove_trailing_slash(bus->path)) {
+		dprintf("Incorrect path to bus %s\n", bus->path);
+		sysfs_close_bus(bus);
+		return NULL;
+	}
+
+	return bus;
+}
+
+/**
+ * sysfs_get_bus_device: Get specific device on bus using device's id
+ * @bus: bus to find device on
+ * @id: bus_id for device
+ * returns struct sysfs_device reference or NULL if not found.
+ */
+struct sysfs_device *sysfs_get_bus_device(struct sysfs_bus *bus, 
+		const char *id)
+{
+	struct sysfs_device *dev = NULL;
+	char devpath[SYSFS_PATH_MAX], target[SYSFS_PATH_MAX];
+	
+	if (!bus || !id) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	if (bus->devices) {
+		dev = (struct sysfs_device *)dlist_find_custom
+			(bus->devices, (void *)id, name_equal);
+		if (dev)
+			return dev;
+	}
+	safestrcpy(devpath, bus->path);
+	safestrcat(devpath, "/");
+	safestrcat(devpath, SYSFS_DEVICES_NAME);
+	safestrcat(devpath, "/");
+	safestrcat(devpath, id);
+	if (sysfs_path_is_link(devpath)) {
+		dprintf("No such device %s on bus %s?\n", id, bus->name);
+		return NULL;
+	}
+	if (!sysfs_get_link(devpath, target, SYSFS_PATH_MAX)) {
+		dev = sysfs_open_device_path(target);
+		if (!dev) {
+			dprintf("Error opening device at %s\n", target);
+			return NULL;
+		}
+		if (!bus->devices)
+			bus->devices = dlist_new_with_delete
+					(sizeof(struct sysfs_device), 
+					 		sysfs_close_dev);
+		dlist_unshift_sorted(bus->devices, dev, sort_list);
+	}
+	return dev;
+}
+
+/**
+ * sysfs_get_bus_driver: Get specific driver on bus using driver name
+ * @bus: bus to find driver on
+ * @drvname: name of driver
+ * returns struct sysfs_driver reference or NULL if not found.
+ */
+struct sysfs_driver *sysfs_get_bus_driver(struct sysfs_bus *bus,
+		const char *drvname)
+{
+	struct sysfs_driver *drv;
+	char drvpath[SYSFS_PATH_MAX];
+	
+	if (!bus || !drvname) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	if (bus->drivers) {
+		drv = (struct sysfs_driver *)dlist_find_custom
+			(bus->drivers, (void *)drvname, name_equal);
+		if (drv)
+			return drv;
+	}
+	safestrcpy(drvpath, bus->path);
+	safestrcat(drvpath, "/");
+	safestrcat(drvpath, SYSFS_DRIVERS_NAME);
+	safestrcat(drvpath, "/");
+	safestrcat(drvpath, drvname);
+	drv = sysfs_open_driver_path(drvpath);
+	if (!drv) {
+		dprintf("Error opening driver at %s\n", drvpath);
+		return NULL;
+	}
+	if (!bus->drivers)
+		bus->drivers = dlist_new_with_delete
+				(sizeof(struct sysfs_driver), 
+				 		sysfs_close_drv);
+	dlist_unshift_sorted(bus->drivers, drv, sort_list);
+	return drv;
+}
+

libsysfs/sysfs_class.c

@@ -40,6 +40,43 @@ void sysfs_close_class_device(struct sysfs_class_device *dev)
 	}
 }
 
+static void sysfs_close_cls_dev(void *dev)
+{
+	sysfs_close_class_device((struct sysfs_class_device *)dev);
+}
+
+/**
+ * sysfs_close_class: close the given class
+ * @cls: sysfs_class to close
+ */ 
+void sysfs_close_class(struct sysfs_class *cls)
+{
+	if (cls) {
+		if (cls->devices)
+			dlist_destroy(cls->devices);
+		if (cls->attrlist)
+			dlist_destroy(cls->attrlist);
+		free(cls);
+	}
+}
+
+static int cdev_name_equal(void *a, void *b)
+{
+	if (!a || !b)
+		return 0;
+
+	if (strncmp((char *)a, ((struct sysfs_class_device *)b)->name, 
+				strlen((char *)a)) == 0)
+		return 1;
+
+	return 0;
+}
+
+static struct sysfs_class *alloc_class(void)
+{
+	return (struct sysfs_class *) calloc(1, sizeof(struct sysfs_class));
+}
+
 /**
  * alloc_class_device: mallocs and initializes new class device struct.
  * returns sysfs_class_device or NULL.
@@ -96,7 +133,7 @@ struct sysfs_class_device *sysfs_open_class_device_path(const char *path)
 		errno = EINVAL;
 		return NULL;
 	}
-	if ((sysfs_path_is_dir(path)) != 0) {
+	if (sysfs_path_is_dir(path)) {
 		dprintf("%s is not a valid path to a class device\n", path);
 		return NULL;
 	}
@@ -113,7 +150,7 @@ struct sysfs_class_device *sysfs_open_class_device_path(const char *path)
 	}
 
 	safestrcpy(cdev->path, path);
-	if ((sysfs_remove_trailing_slash(cdev->path)) != 0) {
+	if (sysfs_remove_trailing_slash(cdev->path)) {
 		dprintf("Invalid path to class device %s\n", cdev->path);
 		sysfs_close_class_device(cdev);
 		return NULL;
@@ -335,3 +372,150 @@ struct sysfs_device *sysfs_get_classdev_device
 	}
 	return clsdev->sysdevice;
 }
+
+/**
+ * sysfs_open_class: opens specific class and all its devices on system
+ * returns sysfs_class structure with success or NULL with error.
+ */
+struct sysfs_class *sysfs_open_class(const char *name)
+{
+	struct sysfs_class *cls = NULL;
+	char classpath[SYSFS_PATH_MAX];
+
+	if (!name) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	memset(classpath, 0, SYSFS_PATH_MAX);
+        if ((sysfs_get_mnt_path(classpath, SYSFS_PATH_MAX)) != 0) {
+                dprintf("Sysfs not supported on this system\n");
+                return NULL;
+        }
+
+	/* 
+	 * We shall now treat "block" also as a class. Hence, check here
+	 * if "name" is "block" and proceed accordingly
+	 */
+	if (strcmp(name, SYSFS_BLOCK_NAME) == 0) {
+		safestrcat(classpath, "/");
+		safestrcat(classpath, SYSFS_BLOCK_NAME);
+	} else {
+		safestrcat(classpath, "/");
+		safestrcat(classpath, SYSFS_CLASS_NAME);
+		safestrcat(classpath, "/");
+		safestrcat(classpath, name);
+	}
+	if (sysfs_path_is_dir(classpath)) {
+		dprintf("Class %s not found on the system\n", name);
+		return NULL;
+	}
+
+	cls = alloc_class();
+	if (cls == NULL) {
+		dprintf("calloc failed\n");
+		return NULL;
+	}
+	safestrcpy(cls->name, name);	
+	safestrcpy(cls->path, classpath);
+	if ((sysfs_remove_trailing_slash(cls->path)) != 0) {
+		dprintf("Invalid path to class device %s\n", cls->path);
+		sysfs_close_class(cls);
+		return NULL;
+	}
+
+	return cls;
+}
+
+/**
+ * sysfs_get_class_device: get specific class device using the device's id
+ * @cls: sysfs_class to find the device on
+ * @name: name of the class device to look for
+ * 
+ * Returns sysfs_class_device * on success and NULL on failure
+ */ 
+struct sysfs_class_device *sysfs_get_class_device(struct sysfs_class *cls,
+		const char *name)
+{
+	char path[SYSFS_PATH_MAX];
+	struct sysfs_class_device *cdev = NULL;
+
+	if (!cls || !name) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	if (cls->devices) {
+		cdev = (struct sysfs_class_device *)dlist_find_custom
+			(cls->devices, (void *)name, cdev_name_equal);
+		if (cdev)
+			return cdev;
+	}
+
+	safestrcpy(path, cls->path);
+	safestrcat(path, "/");
+	safestrcat(path, name);
+	if (!sysfs_path_is_dir(path)) {
+		cdev = sysfs_open_class_device_path(path);
+		if (!cdev) {
+			dprintf("Error opening class device at %s\n", path);
+			return NULL;
+		}
+	}
+	if (!cls->devices)
+		cls->devices = dlist_new_with_delete
+			(sizeof(struct sysfs_class_device),
+				 sysfs_close_cls_dev);
+	
+	dlist_unshift_sorted(cls->devices, cdev, sort_list);
+	return cdev;
+}
+
+/**
+ * sysfs_get_class_devices: get all class devices in the given class
+ * @cls: sysfs_class whose devices list is needed
+ *
+ * Returns a dlist of sysfs_class_device * on success and NULL on failure
+ */
+struct dlist *sysfs_get_class_devices(struct sysfs_class *cls)
+{
+	char path[SYSFS_PATH_MAX];
+	char *cdev_name;
+	struct sysfs_class_device *cdev = NULL;
+	struct dlist *dirlist;
+
+	if (!cls) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	safestrcpy(path, cls->path);
+	dirlist = read_dir_subdirs(path);
+	if (dirlist) {
+		dlist_for_each_data(dirlist, cdev_name, char) {
+			if (cls->devices) {
+				cdev = (struct sysfs_class_device *)
+					dlist_find_custom(cls->devices, 
+					(void *)cdev_name, cdev_name_equal);
+				if (cdev)
+					continue;
+			}
+			safestrcpy(path, cls->path);
+			safestrcat(path, "/");
+			safestrcat(path, cdev_name);
+			cdev = sysfs_open_class_device_path(path);
+			if (cdev) {
+				if (!cls->devices)
+					cls->devices = dlist_new_with_delete
+					(sizeof(struct sysfs_class_device),
+					 sysfs_close_cls_dev);
+				dlist_unshift_sorted(cls->devices, cdev,
+						sort_list);
+			}
+		}
+		sysfs_close_list(dirlist);
+	}
+	
+	return cls->devices;
+}
+

libsysfs/sysfs_device.c

@@ -38,7 +38,6 @@ static int get_dev_driver(struct sysfs_device *dev)
 		errno = EINVAL;
 		return -1;
 	}
-
 	memset(path, 0, SYSFS_PATH_MAX);
 	memset(devpath, 0, SYSFS_PATH_MAX);
 	safestrcpymax(path, dev->path, SYSFS_PATH_MAX);
@@ -53,9 +52,9 @@ static int get_dev_driver(struct sysfs_device *dev)
 	}
 
 	/*
-	 * Devices on on earlier kernels do not have the "driver" link.
+	 * Devices on earlier kernels do not have the "driver" link.
 	 * Look it up in the bus directory.
-	 */
+	 */ 
 	if (dev->bus[0] == '\0')
 		return -1;
 	memset(path, 0, SYSFS_PATH_MAX);
@@ -81,7 +80,7 @@ static int get_dev_driver(struct sysfs_device *dev)
 			safestrcat(devpath, drv);
 			safestrcat(devpath, "/");
 			safestrcat(devpath, dev->bus_id);
-			if (sysfs_path_is_link(devpath) == 0) {
+			if (!sysfs_path_is_link(devpath)) {
 				safestrcpy(dev->driver_name, drv);
 				sysfs_close_list(drvlist);
 				return 0;
@@ -149,7 +148,7 @@ int sysfs_get_device_bus(struct sysfs_device *dev)
 			safestrcat(path, SYSFS_DEVICES_NAME);
 			safestrcat(path, "/");
 			safestrcat(path, dev->bus_id);
-			if ((sysfs_path_is_link(path)) == 0) {
+			if (!sysfs_path_is_link(path)) {
 				memset(target, 0, SYSFS_PATH_MAX);
 				if (sysfs_get_link(path, target, 
 						SYSFS_PATH_MAX)) {

libsysfs/sysfs_dir.c

@@ -338,7 +338,7 @@ struct sysfs_attribute *get_attribute(void *dev, const char *name)
 			SYSFS_PATH_MAX);
 	safestrcatmax(path, "/", SYSFS_PATH_MAX);
 	safestrcatmax(path, name, SYSFS_PATH_MAX);
-	if (!(sysfs_path_is_file(path)))
+	if (!sysfs_path_is_file(path))
 		cur = add_attribute((void *)dev, path);
 	return cur;
 }
@@ -373,7 +373,7 @@ struct dlist *read_dir_links(const char *path)
 		safestrcpy(file_path, path);
 		safestrcat(file_path, "/");
 		safestrcat(file_path, dirent->d_name);
-		if ((sysfs_path_is_link(file_path)) == 0) {
+		if (!sysfs_path_is_link(file_path)) {
 			if (!linklist) {
 				linklist = dlist_new_with_delete
 					(SYSFS_NAME_LEN, sysfs_del_name);
@@ -421,7 +421,7 @@ struct dlist *read_dir_subdirs(const char *path)
 		safestrcpy(file_path, path);
 		safestrcat(file_path, "/");
 		safestrcat(file_path, dirent->d_name);
-		if ((sysfs_path_is_dir(file_path)) == 0) {
+		if (!sysfs_path_is_dir(file_path)) {
 			if (!dirlist) {
 				dirlist = dlist_new_with_delete
 					(SYSFS_NAME_LEN, sysfs_del_name);
@@ -471,7 +471,7 @@ struct dlist *get_attributes_list(void *dev)
 		safestrcpy(file_path, path);
 		safestrcat(file_path, "/");
 		safestrcat(file_path, dirent->d_name);
-		if ((sysfs_path_is_file(file_path)) == 0) {
+		if (!sysfs_path_is_file(file_path)) {
 			if (((struct sysfs_device *)dev)->attrlist) {
 				/* check if attr is already in the list */
 				attr = (struct sysfs_attribute *)

libsysfs/sysfs_utils.c

@@ -3,7 +3,7 @@
  *
  * System utility functions for libsysfs
  *
- * Copyright (C) IBM Corp. 2003
+ * Copyright (C) IBM Corp. 2003-2005
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public