[PATCH] libsysfs: version 2.0

1 files changed, 317 insertions, 0 deletions

diff --git a/libsysfs/sysfs_bus.c b/libsysfs/sysfs_bus.c
new file mode 100644
index 0000000000..921ef32094
--- /dev/null
+++ b/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;
+}
+