diff options
Diffstat (limited to 'libsysfs/sysfs_class.c')
| -rw-r--r-- | libsysfs/sysfs_class.c | 557 |
1 files changed, 0 insertions, 557 deletions
diff --git a/libsysfs/sysfs_class.c b/libsysfs/sysfs_class.c deleted file mode 100644 index 102f09f17a..0000000000 --- a/libsysfs/sysfs_class.c +++ /dev/null @@ -1,557 +0,0 @@ -/* - * 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; - int count = 0; - - c = strstr(cdev->path, SYSFS_CLASS_NAME); - if (c == NULL) { - c = strstr(cdev->path, SYSFS_BLOCK_NAME); - } else { - c = strstr(c, "/"); - } - - if (c == NULL) - safestrcpy(cdev->classname, SYSFS_UNKNOWN); - else { - if (*c == '/') - c++; - e = c; - while (e != NULL && *e != '/' && *e != '\0') { - e++; - count++; - } - strncpy(cdev->classname, c, count); - } -} - -/** - * 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; -} - -/** - * get_blockdev_parent: Get the parent class device for a "block" subsystem - * device if present - * @clsdev: block subsystem class device whose parent needs to be found - * Returns 0 on success and 1 on error - */ -static int get_blockdev_parent(struct sysfs_class_device *clsdev) -{ - char parent_path[SYSFS_PATH_MAX]; - char *c; - - safestrcpy(parent_path, clsdev->path); - c = strstr(parent_path, SYSFS_BLOCK_NAME); - if (c == NULL) { - dprintf("Class device %s does not belong to BLOCK subsystem\n", - clsdev->name); - return 1; - } - c += strlen(SYSFS_BLOCK_NAME); - if (*c == '/') - c++; - else - goto errout; - - /* validate whether the given class device is a partition or not */ - if ((strncmp(c, clsdev->name, strlen(clsdev->name))) == 0) { - dprintf("%s not a partition\n", clsdev->name); - return 1; - } - - c = strchr(c, '/'); - if (c == NULL) - goto errout; - - *c = '\0'; - - clsdev->parent = sysfs_open_class_device_path(parent_path); - if (!clsdev->parent) { - dprintf("Error opening the parent class device at %s\n", - parent_path); - return 1; - } - return 0; - -errout: - dprintf("Invalid path %s\n", clsdev->path); - return 1; -} - -/** - * 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) -{ - if (!clsdev) { - errno = EINVAL; - return NULL; - } - if (clsdev->parent) - return (clsdev->parent); - - /* - * As of now, only block devices have a parent child heirarchy in sysfs - * We do not know, if, in the future, more classes will have a similar - * structure. Hence, we now call a specialized function for block and - * later we can add support functions for other subsystems as required. - */ - if (!(strncmp(clsdev->classname, SYSFS_BLOCK_NAME, - sizeof(SYSFS_BLOCK_NAME)))) { - if ((get_blockdev_parent(clsdev)) == 0) - return (clsdev->parent); - } - return NULL; -} - -/** - * 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) -{ - 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; - } - if (strncmp(classname, SYSFS_BLOCK_NAME, - sizeof(SYSFS_BLOCK_NAME)) == 0) { - safestrcatmax(path, "/", len); - safestrcatmax(path, SYSFS_BLOCK_NAME, len); - } else { - safestrcatmax(path, "/", len); - safestrcatmax(path, SYSFS_CLASS_NAME, len); - safestrcatmax(path, "/", len); - safestrcatmax(path, classname, len); - } - 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_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 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); - 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; -} |