*
* Generic class 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
#include "libsysfs.h"
#include "sysfs.h"
-static void sysfs_close_cls_dev(void *dev)
-{
- sysfs_close_class_device((struct sysfs_class_device *)dev);
-}
-
-/**
- * class_name_equal: compares class_devices' name
- * @a: class_name looking for
- * @b: sysfs_class_device being compared
- */
-static int class_name_equal(void *a, void *b)
-{
- if (a == NULL || b == NULL)
- return 0;
-
- if (strcmp(((char *)a), ((struct sysfs_class_device *)b)->name) == 0)
- return 1;
-
- return 0;
-}
-
/**
* 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 != NULL) {
- if (dev->directory != NULL)
- sysfs_close_directory(dev->directory);
- if (dev->sysdevice != NULL)
- sysfs_close_device(dev->sysdevice);
- if (dev->driver != NULL)
- sysfs_close_driver(dev->driver);
- if (dev->parent != NULL)
+ 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);
}
}
-/**
- * sysfs_close_class: close single class
- * @cls: class structure
- */
-void sysfs_close_class(struct sysfs_class *cls)
-{
- if (cls != NULL) {
- if (cls->directory != NULL)
- sysfs_close_directory(cls->directory);
- if (cls->devices != NULL)
- dlist_destroy(cls->devices);
- free(cls);
- }
-}
-
/**
* 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)
{
- return (struct sysfs_class_device *)
- calloc(1, sizeof(struct sysfs_class_device));
-}
+ struct sysfs_class_device *dev;
-/**
- * alloc_class: mallocs new class structure
- * returns sysfs_class struct or NULL
- */
-static struct sysfs_class *alloc_class(void)
-{
- return (struct sysfs_class *)calloc(1, sizeof(struct sysfs_class));
+ 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 = NULL, *e = NULL;
+ 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 = strchr(c, '/');
+ c = strstr(c, "/");
}
if (c == NULL)
*/
struct sysfs_class_device *sysfs_open_class_device_path(const char *path)
{
- struct sysfs_class_device *cdev = NULL;
+ struct sysfs_class_device *cdev;
- if (path == NULL) {
+ if (!path) {
errno = EINVAL;
return NULL;
}
return NULL;
}
cdev = alloc_class_device();
- if (cdev == NULL) {
+ if (!cdev) {
dprintf("calloc failed\n");
return NULL;
}
- if ((sysfs_get_name_from_path(path, cdev->name, SYSFS_NAME_LEN)) != 0) {
+ if (sysfs_get_name_from_path(path, cdev->name, SYSFS_NAME_LEN)) {
errno = EINVAL;
dprintf("Error getting class device name\n");
sysfs_close_class_device(cdev);
return cdev;
}
-/**
- * sysfs_get_class_devices: gets all devices for class
- * @cls: class to get devices for
- * returns dlist of class_devices with success and NULL with error
- */
-struct dlist *sysfs_get_class_devices(struct sysfs_class *cls)
-{
- struct sysfs_class_device *dev = NULL;
- struct sysfs_directory *cur = NULL;
-
- if (cls == NULL) {
- errno = EINVAL;
- return NULL;
- }
-
- if (cls->devices != NULL)
- return cls->devices;
-
- if (cls->directory == NULL) {
- cls->directory = sysfs_open_directory(cls->path);
- if (cls->directory == NULL)
- return NULL;
- }
-
- if ((sysfs_read_dir_subdirs(cls->directory)) != 0)
- return NULL;
-
- if (cls->directory->subdirs != NULL) {
- dlist_for_each_data(cls->directory->subdirs, cur,
- struct sysfs_directory) {
- dev = sysfs_open_class_device_path(cur->path);
- if (dev == NULL) {
- dprintf("Error opening device at %s\n",
- cur->path);
- continue;
- }
- if (cls->devices == NULL)
- cls->devices = dlist_new_with_delete
- (sizeof(struct sysfs_class_device),
- sysfs_close_cls_dev);
- dlist_unshift_sorted(cls->devices, dev, sort_list);
- }
- }
- return cls->devices;
-}
-
-/**
- * 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 == NULL) {
- 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)) != 0) {
- 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
- * @class: class to find device on
- * @name: class name of the device
- */
-struct sysfs_class_device *sysfs_get_class_device(struct sysfs_class *cls,
- char *name)
-{
- if (cls == NULL || name == NULL) {
- errno = EINVAL;
- return NULL;
- }
-
- if (cls->devices == NULL) {
- cls->devices = sysfs_get_class_devices(cls);
- if (cls->devices == NULL)
- return NULL;
- }
- return (struct sysfs_class_device *)dlist_find_custom(cls->devices,
- name, class_name_equal);
-}
-
-/**
- * sysfs_get_classdev_device: returns the sysfs_device corresponding to
- * sysfs_class_device, if present
- * @clsdev: class device whose sysfs_device is required
- * Returns sysfs_device on success, NULL on error or if device is not
- * implemented
- */
-struct sysfs_device *sysfs_get_classdev_device
- (struct sysfs_class_device *clsdev)
-{
- struct sysfs_link *devlink = NULL;
- char devpath[SYSFS_PATH_MAX];
-
- if (clsdev == NULL) {
- errno = EINVAL;
- return NULL;
- }
- safestrcpy(devpath, clsdev->path);
- safestrcat(devpath, "/device");
- if ((sysfs_path_is_link(devpath)) != 0) {
- if (clsdev->sysdevice != NULL) {
- sysfs_close_device(clsdev->sysdevice);
- clsdev->sysdevice = NULL;
- }
- return NULL;
- }
-
- if (clsdev->directory == NULL) {
- clsdev->directory = sysfs_open_directory(clsdev->path);
- if (clsdev->directory == NULL)
- return NULL;
- }
- devlink = sysfs_get_directory_link(clsdev->directory, "device");
- if (devlink == NULL) {
- if (clsdev->sysdevice != NULL) {
- dprintf("Device link no longer exists\n");
- sysfs_close_device(clsdev->sysdevice);
- clsdev->sysdevice = NULL;
- }
- return NULL;
- }
-
- if (clsdev->sysdevice != NULL) {
- if (!strncmp(devlink->target, clsdev->sysdevice->path,
- SYSFS_PATH_MAX))
- /* sysdevice hasn't changed */
- return (clsdev->sysdevice);
- else
- /* come here only if the device link for has changed */
- sysfs_close_device(clsdev->sysdevice);
- }
-
- clsdev->sysdevice = sysfs_open_device_path(devlink->target);
- if (clsdev->sysdevice == NULL)
- return NULL;
-
- return (clsdev->sysdevice);
-}
-
-/**
- * sysfs_get_classdev_driver: returns the sysfs_driver corresponding to
- * sysfs_class_device, if present
- * @clsdev: class device whose sysfs_device is required
- * Returns sysfs_driver on success, NULL on error or if driver is not
- * implemented
- */
-struct sysfs_driver *sysfs_get_classdev_driver
- (struct sysfs_class_device *clsdev)
-{
- struct sysfs_link *drvlink = NULL;
- char drvpath[SYSFS_PATH_MAX];
-
- if (clsdev == NULL) {
- errno = EINVAL;
- return NULL;
- }
- safestrcpy(drvpath, clsdev->path);
- safestrcat(drvpath, "/driver");
- if ((sysfs_path_is_link(drvpath)) != 0) {
- if (clsdev->driver != NULL) {
- sysfs_close_driver(clsdev->driver);
- clsdev->driver = NULL;
- }
- return NULL;
- }
-
- if (clsdev->directory == NULL) {
- clsdev->directory = sysfs_open_directory(clsdev->path);
- if (clsdev->directory == NULL)
- return NULL;
- }
- drvlink = sysfs_get_directory_link(clsdev->directory, "driver");
- if (drvlink == NULL) {
- if (clsdev->driver != NULL) {
- dprintf("Driver link no longer exists\n");
- sysfs_close_driver(clsdev->driver);
- clsdev->driver = NULL;
- }
- return NULL;
- }
- if (clsdev->driver != NULL) {
- if (!strncmp(drvlink->target, clsdev->driver->path,
- SYSFS_PATH_MAX))
- /* driver hasn't changed */
- return (clsdev->driver);
- else
- /* come here only if the device link for has changed */
- sysfs_close_driver(clsdev->driver);
- }
-
- clsdev->driver = sysfs_open_driver_path(drvlink->target);
- if (clsdev->driver == NULL)
- return NULL;
-
- return (clsdev->driver);
-}
-
/**
* get_blockdev_parent: Get the parent class device for a "block" subsystem
* device if present
*/
static int get_blockdev_parent(struct sysfs_class_device *clsdev)
{
- char parent_path[SYSFS_PATH_MAX], *c = NULL;
+ char parent_path[SYSFS_PATH_MAX];
+ char *c;
safestrcpy(parent_path, clsdev->path);
c = strstr(parent_path, SYSFS_BLOCK_NAME);
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, '/');
+ /* 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 == NULL) {
+ if (!clsdev->parent) {
dprintf("Error opening the parent class device at %s\n",
parent_path);
return 1;
struct sysfs_class_device *sysfs_get_classdev_parent
(struct sysfs_class_device *clsdev)
{
- if (clsdev == NULL) {
+ if (!clsdev) {
errno = EINVAL;
return NULL;
}
- if (clsdev->parent != 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)
static int get_classdev_path(const char *classname, const char *clsdev,
char *path, size_t len)
{
- if (classname == NULL || clsdev == NULL || path == NULL) {
+ 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 (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) {
(const char *classname, const char *name)
{
char devpath[SYSFS_PATH_MAX];
- struct sysfs_class_device *cdev = NULL;
+ struct sysfs_class_device *cdev;
- if (classname == NULL || name == NULL) {
+ if (!classname || !name) {
errno = EINVAL;
return NULL;
}
name, classname);
return NULL;
}
-
+
cdev = sysfs_open_class_device_path(devpath);
- if (cdev == NULL) {
+ if (!cdev) {
dprintf("Error getting class device %s from class %s\n",
name, classname);
return NULL;
return cdev;
}
-/**
- * sysfs_get_classdev_attributes: returns a dlist of attributes for
- * the requested class_device
- * @cdev: sysfs_class_dev for which attributes are needed
- * returns a dlist of attributes if exists, NULL otherwise
- */
-struct dlist *sysfs_get_classdev_attributes(struct sysfs_class_device *cdev)
-{
- if (cdev == NULL)
- return NULL;
-
- if (cdev->directory == NULL) {
- cdev->directory = sysfs_open_directory(cdev->path);
- if (cdev->directory == NULL)
- return NULL;
- }
- if (cdev->directory->attributes == NULL) {
- if ((sysfs_read_dir_attributes(cdev->directory)) != 0)
- return NULL;
- }
- return (cdev->directory->attributes);
-}
-
-/**
- * sysfs_refresh_clsassdev_attributes: refreshes the driver's list of attributes
- * @clsdev: sysfs_class_device whose attributes to refresh
- *
- * NOTE: Upon return, prior references to sysfs_attributes for this classdev
- * _may_ not be valid
- *
- * Returns list of attributes on success and NULL on failure
- */
-struct dlist *sysfs_refresh_classdev_attributes
- (struct sysfs_class_device *clsdev)
-{
- if (clsdev == NULL) {
- errno = EINVAL;
- return NULL;
- }
-
- if (clsdev->directory == NULL)
- return (sysfs_get_classdev_attributes(clsdev));
-
- if ((sysfs_refresh_dir_attributes(clsdev->directory)) != 0) {
- dprintf("Error refreshing class_device attributes\n");
- return NULL;
- }
-
- return (clsdev->directory->attributes);
-}
-
/**
* sysfs_get_classdev_attr: searches class device's attributes by name
* @clsdev: class device to look through
struct sysfs_attribute *sysfs_get_classdev_attr
(struct sysfs_class_device *clsdev, const char *name)
{
- struct sysfs_attribute *cur = NULL;
- struct sysfs_directory *sdir = NULL;
- struct dlist *attrlist = NULL;
-
- if (clsdev == NULL || name == NULL) {
+ if (!clsdev || !name) {
errno = EINVAL;
return NULL;
}
-
- /*
- * First, see if it's in the current directory. Then look at
- * subdirs since class devices can have subdirs of attributes.
- */
- attrlist = sysfs_get_classdev_attributes(clsdev);
- if (attrlist != NULL) {
- cur = sysfs_get_directory_attribute(clsdev->directory,
- (char *)name);
- if (cur != NULL)
- return cur;
- }
+ return get_attribute(clsdev, (char *)name);
+}
- if (clsdev->directory == NULL)
+/**
+ * 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;
-
- if (clsdev->directory->subdirs == NULL)
- if ((sysfs_read_dir_subdirs(clsdev->directory)) != 0 ||
- clsdev->directory->subdirs == NULL)
- return NULL;
-
- if (clsdev->directory->subdirs != NULL) {
- dlist_for_each_data(clsdev->directory->subdirs, sdir,
- struct sysfs_directory) {
- if ((sysfs_path_is_dir(sdir->path)) != 0)
- continue;
- cur = sysfs_get_directory_attribute(sdir,
- (char *)name);
- if (cur == NULL)
- continue;
- }
}
- return cur;
+ return get_attributes_list(clsdev);
}
/**
- * sysfs_open_classdev_attr: read an attribute for a given class device
- * @classname: name of the class on which to look
- * @dev: class device name for which the attribute has to be read
- * @attrib: attribute to read
- * Returns sysfs_attribute * on SUCCESS and NULL on error
- *
- * NOTE:
- * A call to sysfs_close_attribute() is required to close the
- * attribute returned and to free memory
+ * 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_attribute *sysfs_open_classdev_attr(const char *classname,
- const char *dev, const char *attrib)
+struct sysfs_device *sysfs_get_classdev_device
+ (struct sysfs_class_device *clsdev)
{
- struct sysfs_attribute *attribute = NULL;
- char path[SYSFS_PATH_MAX];
+ char linkpath[SYSFS_PATH_MAX], devpath[SYSFS_PATH_MAX];
- if (classname == NULL || dev == NULL || attrib == NULL) {
+ if (!clsdev) {
errno = EINVAL;
return NULL;
}
- memset(path, 0, SYSFS_PATH_MAX);
- if ((get_classdev_path(classname, dev, path, SYSFS_PATH_MAX)) != 0) {
- dprintf("Error getting to device %s on class %s\n",
- dev, classname);
- return NULL;
- }
- safestrcat(path, "/");
- safestrcat(path, attrib);
- attribute = sysfs_open_attribute(path);
- if (attribute == NULL) {
- dprintf("Error opening attribute %s on class device %s\n",
- attrib, dev);
- return NULL;
- }
- if ((sysfs_read_attribute(attribute)) != 0) {
- dprintf("Error reading attribute %s for class device %s\n",
- attrib, dev);
- sysfs_close_attribute(attribute);
- 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 attribute;
+ return clsdev->sysdevice;
}
-
~ianmdlvl / elogind.git / blobdiff