[PATCH] added libsysfs code from sysutils-0.1.1-071803 release

1 files changed, 199 insertions, 0 deletions

diff --git a/libsysfs/sysfs_device.c b/libsysfs/sysfs_device.c
new file mode 100644
index 0000000000..185b5cf378
--- /dev/null
+++ b/libsysfs/sysfs_device.c
@@ -0,0 +1,199 @@
+/*
+ * sysfs_device.c
+ *
+ * Generic device utility functions for libsysfs
+ *
+ * Copyright (C) 2003 International Business Machines, Inc.
+ *
+ *  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_device: closes and cleans up a device
+ * @dev = device to clean up
+ */
+void sysfs_close_device(struct sysfs_device *dev)
+{
+	if (dev != NULL) {
+		dev->next = NULL;
+		dev->driver = NULL;
+		if (dev->directory != NULL)
+			sysfs_close_directory(dev->directory);
+		dev->children = NULL;
+		free(dev);
+	}
+}
+
+/**
+ * alloc_device: allocates and initializes device structure
+ * returns struct sysfs_device
+ */
+static struct sysfs_device *alloc_device(void)
+{
+	return (struct sysfs_device *)calloc(1, sizeof(struct sysfs_device));
+}
+
+/**
+ * sysfs_get_device_attr: searches dev's attributes by name
+ * @dev: device to look through
+ * @name: attribute name to get
+ * returns sysfs_attribute reference with success or NULL with error.
+ */
+struct sysfs_attribute *sysfs_get_device_attr(struct sysfs_device *dev,
+						const char *name)
+{
+	struct sysfs_attribute *cur = NULL;
+	char attrname[SYSFS_NAME_LEN];
+
+	if (dev == NULL || dev->directory == NULL || name == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+	for (cur = dev->directory->attributes; cur != NULL; cur = cur->next) {
+		if ((sysfs_get_name_from_path(cur->path, attrname, 
+		    SYSFS_NAME_LEN)) != 0) 
+			continue;
+		if (strcmp(name, attrname) != 0)
+			continue;
+
+		return cur;
+	}
+
+	return NULL;
+}
+
+/**
+ * sysfs_open_device: opens and populates device structure
+ * @path: path to device, this is the /sys/devices/ path
+ * returns sysfs_device structure with success or NULL with error
+ */
+struct sysfs_device *sysfs_open_device(const char *path)
+{
+	struct sysfs_device *dev = NULL;
+	struct sysfs_directory *sdir = NULL;
+	char *p = NULL;
+
+	if (path == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+	dev = alloc_device();	
+	if (dev == NULL) {
+		dprintf(stderr, "Error allocating device at %s\n", path);
+		return NULL;
+	}
+	sdir = sysfs_open_directory(path);
+	if (sdir == NULL) {
+		dprintf(stderr, "Invalid device at %s\n", path);
+		errno = EINVAL;
+		sysfs_close_device(dev);
+		return NULL;
+	}
+	if ((sysfs_read_directory(sdir)) != 0) {
+		dprintf(stderr, "Error reading device directory at %s\n", path);
+		sysfs_close_directory(sdir);
+		sysfs_close_device(dev);
+		return NULL;
+	}
+	dev->directory = sdir;
+	sysfs_get_name_from_path(sdir->path, dev->bus_id, SYSFS_NAME_LEN);
+	/* get device name */
+	p = sysfs_get_value_from_attributes(sdir->attributes,	
+							SYSFS_NAME_ATTRIBUTE);
+	if (p != NULL) {
+		strncpy(dev->name, p, SYSFS_NAME_LEN);
+		p = dev->name + strlen(dev->name) - 1;
+		if ((strlen(dev->name) > 0) && *p == '\n')
+			*p = '\0';
+	}
+
+	return dev;
+}
+
+/**
+ * sysfs_close_device_tree: closes every device in the supplied tree, 
+ * 	closing children only.
+ * @devroot: device root of tree.
+ */
+void sysfs_close_device_tree(struct sysfs_device *devroot)
+{
+	if (devroot != NULL) {
+		if (devroot->children != NULL) {
+			struct sysfs_device *child = NULL, *next = NULL;
+	
+			for (child = devroot->children; child != NULL;
+			     child = next) {
+				next = child->next;
+				sysfs_close_device_tree(child);
+			}
+		}
+		sysfs_close_device(devroot);
+	}
+}
+
+/**
+ * add_device_child_to_parent: adds child device to parent
+ * @parent: parent device.
+ * @child: child device to add.
+ */
+static void add_device_child_to_parent(struct sysfs_device *parent,
+					struct sysfs_device *child)
+{
+	if (parent != NULL && child != NULL) {
+		child->next = parent->children;
+		parent->children = child;
+		child->parent = parent;
+	}
+}
+
+/**
+ * sysfs_open_device_tree: opens root device and all of its children,
+ *	creating a tree of devices. Only opens children.
+ * @path: sysfs path to devices
+ * returns struct sysfs_device and its children with success or NULL with
+ *	error.
+ */
+struct sysfs_device *sysfs_open_device_tree(const char *path)
+{
+	struct sysfs_device *rootdev = NULL, *new = NULL;
+	struct sysfs_directory *cur = NULL;
+
+	if (path == NULL) {
+		errno = EINVAL;
+		return NULL;
+	}
+	rootdev = sysfs_open_device(path);
+	if (rootdev == NULL) {
+		dprintf(stderr, "Error opening root device at %s\n", path);
+		return NULL;
+	}
+	cur = rootdev->directory->subdirs;
+	while (cur != NULL) {
+		new = sysfs_open_device_tree(cur->path);
+		if (new == NULL) {
+			dprintf(stderr, "Error opening device tree at %s\n",
+				cur->path);
+			sysfs_close_device_tree(rootdev);
+			return NULL;
+		}
+		add_device_child_to_parent(rootdev, new);	
+		cur = cur->next;
+	}
+
+	return rootdev;
+}