Fully integrate libsysfs into NetNuke (it compiles and links correctly)

1 files changed, 551 insertions, 0 deletions

diff --git a/libsysfs/sysfs_class.c b/libsysfs/sysfs_class.c
new file mode 100644
index 0000000..4fe0b82
--- /dev/null
+++ b/libsysfs/sysfs_class.c
@@ -0,0 +1,551 @@
+/*
+ * sysfs_class.c
+ *
+ * Generic class 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"
+
+/**
+ * sysfs_close_class_device: closes a single class device.
+ * @dev: class device to close.
+ */
+void sysfs_close_class_device(struct sysfs_class_device *dev)
+{
+	if (dev) {
+		if (dev->parent)
+			sysfs_close_class_device(dev->parent);
+		if (dev->sysdevice)
+			sysfs_close_device(dev->sysdevice);
+		if (dev->attrlist)
+			dlist_destroy(dev->attrlist);
+		free(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.
+ */
+static struct sysfs_class_device *alloc_class_device(void)
+{
+	struct sysfs_class_device *dev;
+
+	dev = calloc(1, sizeof(struct sysfs_class_device));
+	return dev;
+}
+
+/**
+ * set_classdev_classname: Grabs classname from path
+ * @cdev: class device to set
+ * Returns nothing
+ */
+static void set_classdev_classname(struct sysfs_class_device *cdev)
+{
+	char *c, *e, name[SYSFS_PATH_MAX], link[SYSFS_PATH_MAX];
+	struct stat stats;
+	int count = 0;
+
+	/*
+	 * Newer driver core changes have a class:class_device representation.
+	 * Check if this cdev belongs to the newer style subsystem and
+	 * set the classname appropriately.
+	 */
+	memset(name, 0, SYSFS_PATH_MAX);
+	safestrcpy(name, cdev->name);
+	c = strchr(name, ':');
+	if (c) {
+		safestrcpy(cdev->name, c+1);
+		*c = '\0';
+		safestrcpy(cdev->classname, name);
+		return;
+	}
+
+	c = strstr(cdev->path, SYSFS_CLASS_NAME);
+	if (c == NULL)
+		c = strstr(cdev->path, SYSFS_BLOCK_NAME);
+	else
+		c = strstr(c, "/");
+
+	if (c) {
+		if (*c == '/')
+			c++;
+		e = c;
+		while (e != NULL && *e != '/' && *e != '\0') {
+			e++;
+			count++;
+		}
+		strncpy(cdev->classname, c, count);
+	} else {
+		strcpy(link, cdev->path);
+		strcat(link, "/subsystem");
+		sysfs_get_link(link, name, SYSFS_PATH_MAX);
+		if (lstat(name, &stats))
+			safestrcpy(cdev->classname, SYSFS_UNKNOWN);
+		else {
+			c = strrchr(name, '/');
+			if (c)
+				safestrcpy(cdev->classname, c+1);
+			else
+				safestrcpy(cdev->classname, SYSFS_UNKNOWN);
+		}
+	}
+}
+
+/**
+ * sysfs_open_class_device_path: Opens and populates class device
+ * @path: path to class device.
+ * returns struct sysfs_class_device with success and NULL with error.
+ */
+struct sysfs_class_device *sysfs_open_class_device_path(const char *path)
+{
+	struct sysfs_class_device *cdev;
+	char temp_path[SYSFS_PATH_MAX];
+
+	if (!path) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	/*
+	 * Post linux-2.6.14 driver model supports nested classes with
+	 * links to the nested hierarchy at /sys/class/xxx/. Check for
+	 * a link to the actual class device if a directory isn't found
+	 */
+	if (sysfs_path_is_dir(path)) {
+		dprintf("%s: Directory not found, checking for a link\n", path);
+		if (!sysfs_path_is_link(path)) {
+			if (sysfs_get_link(path, temp_path, SYSFS_PATH_MAX)) {
+				dprintf("Error retrieving link at %s\n", path);
+				return NULL;
+			}
+		} else {
+			dprintf("%s is not a valid class device path\n", path);
+			return NULL;
+		}
+	} else
+		safestrcpy(temp_path, path);
+
+	cdev = alloc_class_device();
+	if (!cdev) {
+		dprintf("calloc failed\n");
+		return NULL;
+	}
+	if (sysfs_get_name_from_path(temp_path, cdev->name, SYSFS_NAME_LEN)) {
+		errno = EINVAL;
+		dprintf("Error getting class device name\n");
+		sysfs_close_class_device(cdev);
+		return NULL;
+	}
+
+	safestrcpy(cdev->path, temp_path);
+	if (sysfs_remove_trailing_slash(cdev->path)) {
+		dprintf("Invalid path to class device %s\n", cdev->path);
+		sysfs_close_class_device(cdev);
+		return NULL;
+	}
+	set_classdev_classname(cdev);
+
+	return cdev;
+}
+
+/**
+ * sysfs_get_classdev_parent: Retrieves the parent of a class device.
+ * 	eg., when working with hda1, this function can be used to retrieve the
+ * 		sysfs_class_device for hda
+ *
+ * @clsdev: class device whose parent details are required.
+ * Returns sysfs_class_device of the parent on success, NULL on failure
+ */
+struct sysfs_class_device *sysfs_get_classdev_parent
+				(struct sysfs_class_device *clsdev)
+{
+	char abs_path[SYSFS_PATH_MAX], tmp_path[SYSFS_PATH_MAX];
+	char *c;
+
+	if (!clsdev) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	if (clsdev->parent)
+		return (clsdev->parent);
+
+	memset(abs_path, 0, SYSFS_PATH_MAX);
+	memset(tmp_path, 0, SYSFS_PATH_MAX);
+
+	safestrcpy(tmp_path, clsdev->path);
+	c = strstr(tmp_path, clsdev->classname);
+	c = strchr(c, '/');
+	*c = '\0';
+
+	safestrcpy(abs_path, clsdev->path);
+	c = strrchr(abs_path, '/');
+	*c = '\0';
+
+	if ((strncmp(tmp_path, abs_path, strlen(abs_path))) == 0) {
+		dprintf("Class device %s doesn't have a parent\n",
+				clsdev->name);
+		return NULL;
+	}
+
+	clsdev->parent = sysfs_open_class_device_path(abs_path);
+
+	return clsdev->parent;
+}
+
+/**
+ * get_classdev_path: given the class and a device in the class, return the
+ * 		absolute path to the device
+ * @classname: name of the class
+ * @clsdev: the class device
+ * @path: buffer to return path
+ * @psize: size of "path"
+ * Returns 0 on SUCCESS or -1 on error
+ */
+static int get_classdev_path(const char *classname, const char *clsdev,
+		char *path, size_t len)
+{
+	char *c;
+
+	if (!classname || !clsdev || !path) {
+		errno = EINVAL;
+		return -1;
+	}
+	if (sysfs_get_mnt_path(path, len) != 0) {
+		dprintf("Error getting sysfs mount path\n");
+		return -1;
+	}
+	safestrcatmax(path, "/", len);
+	if (strncmp(classname, SYSFS_BLOCK_NAME,
+				sizeof(SYSFS_BLOCK_NAME)) == 0) {
+		safestrcatmax(path, SYSFS_BLOCK_NAME, len);
+		if (!sysfs_path_is_dir(path))
+			goto done;
+		c = strrchr(path, '/');
+		*(c+1) = '\0';
+	}
+	safestrcatmax(path, SYSFS_CLASS_NAME, len);
+	safestrcatmax(path, "/", len);
+	safestrcatmax(path, classname, len);
+done:
+	safestrcatmax(path, "/", len);
+	safestrcatmax(path, clsdev, len);
+	return 0;
+}
+
+/**
+ * sysfs_open_class_device: Locates a specific class_device and returns it.
+ * Class_device must be closed using sysfs_close_class_device
+ * @classname: Class to search
+ * @name: name of the class_device
+ *
+ * NOTE:
+ * 	Call sysfs_close_class_device() to close the class device
+ */
+struct sysfs_class_device *sysfs_open_class_device
+		(const char *classname, const char *name)
+{
+	char devpath[SYSFS_PATH_MAX];
+	struct sysfs_class_device *cdev;
+
+	if (!classname || !name) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	memset(devpath, 0, SYSFS_PATH_MAX);
+	if ((get_classdev_path(classname, name, devpath,
+					SYSFS_PATH_MAX)) != 0) {
+		dprintf("Error getting to device %s on class %s\n",
+							name, classname);
+		return NULL;
+	}
+
+	cdev = sysfs_open_class_device_path(devpath);
+	if (!cdev) {
+		dprintf("Error getting class device %s from class %s\n",
+				name, classname);
+		return NULL;
+	}
+	return cdev;
+}
+
+/**
+ * sysfs_get_classdev_attr: searches class device's attributes by name
+ * @clsdev: class device to look through
+ * @name: attribute name to get
+ * returns sysfs_attribute reference with success or NULL with error
+ */
+struct sysfs_attribute *sysfs_get_classdev_attr
+		(struct sysfs_class_device *clsdev, const char *name)
+{
+	if (!clsdev || !name) {
+		errno = EINVAL;
+		return NULL;
+	}
+	return get_attribute(clsdev, (char *)name);
+}
+
+/**
+ * sysfs_get_classdev_attributes: gets list of classdev attributes
+ * @clsdev: class device whose attributes list is needed
+ * returns dlist of attributes on success or NULL on error
+ */
+struct dlist *sysfs_get_classdev_attributes(struct sysfs_class_device *clsdev)
+{
+	if (!clsdev) {
+		errno = EINVAL;
+		return NULL;
+	}
+	return get_dev_attributes_list(clsdev);
+}
+
+/**
+ * sysfs_get_classdev_device: gets the sysfs_device associated with the
+ * 	given sysfs_class_device
+ * @clsdev: class device whose associated sysfs_device is needed
+ * returns struct sysfs_device * on success or NULL on error
+ */
+struct sysfs_device *sysfs_get_classdev_device
+		(struct sysfs_class_device *clsdev)
+{
+	char linkpath[SYSFS_PATH_MAX], devpath[SYSFS_PATH_MAX];
+
+	if (!clsdev) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	if (clsdev->sysdevice)
+		return clsdev->sysdevice;
+
+	memset(linkpath, 0, SYSFS_PATH_MAX);
+	safestrcpy(linkpath, clsdev->path);
+	safestrcat(linkpath, "/device");
+	if (!sysfs_path_is_link(linkpath)) {
+		memset(devpath, 0, SYSFS_PATH_MAX);
+		if (!sysfs_get_link(linkpath, devpath, SYSFS_PATH_MAX))
+			clsdev->sysdevice = sysfs_open_device_path(devpath);
+	}
+	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 *c, 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;
+	}
+
+	safestrcat(classpath, "/");
+	if (strcmp(name, SYSFS_BLOCK_NAME) == 0) {
+		safestrcat(classpath, SYSFS_BLOCK_NAME);
+		if (!sysfs_path_is_dir(classpath))
+			goto done;
+		c = strrchr(classpath, '/');
+		*(c+1) = '\0';
+	}
+	safestrcat(classpath, SYSFS_CLASS_NAME);
+	safestrcat(classpath, "/");
+	safestrcat(classpath, name);
+done:
+	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);
+	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;
+}
+
+/**
+ * Add class devices to list
+ */
+static void add_cdevs_to_classlist(struct sysfs_class *cls, struct dlist *list)
+{
+	char path[SYSFS_PATH_MAX], *cdev_name;
+	struct sysfs_class_device *cdev = NULL;
+
+	if (cls == NULL || list == NULL)
+		return;
+
+	dlist_for_each_data(list, 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_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];
+	struct dlist *dirlist, *linklist;
+
+	if (!cls) {
+		errno = EINVAL;
+		return NULL;
+	}
+
+	/*
+	 * Post linux-2.6.14, we have nested classes and links under
+	 * /sys/class/xxx/. are also valid class devices
+	 */
+	safestrcpy(path, cls->path);
+	dirlist = read_dir_subdirs(path);
+	if (dirlist) {
+		add_cdevs_to_classlist(cls, dirlist);
+		sysfs_close_list(dirlist);
+	}
+
+	linklist = read_dir_links(path);
+	if (linklist) {
+		add_cdevs_to_classlist(cls, linklist);
+		sysfs_close_list(linklist);
+	}
+
+	return cls->devices;
+}