*
* Generic device 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 "sysfs.h"
/**
- * get_dev_driver: fills in the dev->driver_name field, but searches by
- * opening subsystem. Only to be used if no driver link exists in
- * device directory.
- *
- * Returns 0 on SUCCESS and 1 on error
+ * get_dev_driver: fills in the dev->driver_name field
+ * Returns 0 on SUCCESS and -1 on error
*/
static int get_dev_driver(struct sysfs_device *dev)
{
- struct dlist *drvlist = NULL;
- char path[SYSFS_PATH_MAX], devpath[SYSFS_PATH_MAX];
- char *drv = NULL, *c = NULL;
-
- if (dev == NULL) {
+ struct dlist *drvlist;
+ char path[SYSFS_PATH_MAX];
+ char devpath[SYSFS_PATH_MAX];
+ char *drv = NULL, *c;
+
+ if (!dev) {
errno = EINVAL;
- return 1;
+ return -1;
+ }
+
+ memset(path, 0, SYSFS_PATH_MAX);
+ memset(devpath, 0, SYSFS_PATH_MAX);
+ safestrcpymax(path, dev->path, SYSFS_PATH_MAX);
+ safestrcatmax(path, "/driver", SYSFS_PATH_MAX);
+ if (!sysfs_path_is_link(path)) {
+ if (!sysfs_get_link(path, devpath, SYSFS_PATH_MAX)) {
+ if (sysfs_get_name_from_path(devpath,
+ dev->driver_name, SYSFS_NAME_LEN))
+ return -1;
+ }
+ return 0;
}
+
+ /*
+ * Devices on on earlier kernels do not have the "driver" link.
+ * Look it up in the bus directory.
+ */
if (dev->bus[0] == '\0')
- return 1;
+ return -1;
memset(path, 0, SYSFS_PATH_MAX);
memset(devpath, 0, SYSFS_PATH_MAX);
- safestrcpy(path, SYSFS_BUS_NAME);
+ safestrcpy(path, dev->path);
+ c = strstr(path, SYSFS_DEVICES_NAME);
+ if (c == NULL) {
+ dprintf("Invalid path to device - %s\n", dev->path);
+ return -1;
+ } else
+ *c = '\0';
+ safestrcat(path, SYSFS_BUS_NAME);
safestrcat(path, "/");
safestrcat(path, dev->bus);
safestrcat(path, "/");
safestrcat(path, SYSFS_DRIVERS_NAME);
- safestrcpy(devpath, dev->path);
- c = strstr(devpath, SYSFS_DEVICES_NAME);
- if (c == NULL)
- return 1;
- *c = '\0';
- safestrcatmax(c, path, (sizeof(devpath) - strlen(devpath)));
-
- drvlist = sysfs_open_subsystem_list(path);
- if (drvlist != NULL) {
+ drvlist = sysfs_open_directory_list(path);
+ if (drvlist) {
dlist_for_each_data(drvlist, drv, char) {
- safestrcpy(path, devpath);
- safestrcat(path, "/");
- safestrcat(path, drv);
- safestrcat(path, "/");
- safestrcat(path, dev->bus_id);
- if (sysfs_path_is_link(path) == 0) {
+ safestrcpy(devpath, path);
+ safestrcat(devpath, "/");
+ safestrcat(devpath, drv);
+ safestrcat(devpath, "/");
+ safestrcat(devpath, dev->bus_id);
+ if (sysfs_path_is_link(devpath) == 0) {
safestrcpy(dev->driver_name, drv);
sysfs_close_list(drvlist);
return 0;
}
sysfs_close_list(drvlist);
}
- return 1;
+ return -1;
}
-/*
- * get_device_driver_name: gets device's driver name, searches for driver
- * link first before going the brute force route.
- * @dev: device to retrieve driver
- * returns 0 with success and 1 with error
- */
-static int get_device_driver_name(struct sysfs_device *dev)
-{
- char devpath[SYSFS_PATH_MAX], drvpath[SYSFS_PATH_MAX];
-
- if (dev == NULL) {
- errno = EINVAL;
- return 1;
- }
- memset(devpath, 0, SYSFS_PATH_MAX);
- memset(drvpath, 0, SYSFS_PATH_MAX);
- safestrcpy(devpath, dev->path);
- safestrcat(devpath, "/driver");
-
- if ((sysfs_get_link(devpath, drvpath, SYSFS_PATH_MAX)) != 0)
- return(get_dev_driver(dev));
-
- return (sysfs_get_name_from_path(drvpath, dev->driver_name,
- SYSFS_NAME_LEN));
-}
-
/**
* sysfs_get_device_bus: retrieves the bus name the device is on, checks path
* to bus' link to make sure it has correct device.
*/
int sysfs_get_device_bus(struct sysfs_device *dev)
{
- char subsys[SYSFS_NAME_LEN], path[SYSFS_PATH_MAX];
- char target[SYSFS_PATH_MAX], *bus = NULL, *c = NULL;
- struct dlist *buslist = NULL;
+ char devpath[SYSFS_PATH_MAX];
+ char subsys[SYSFS_NAME_LEN];
+ char path[SYSFS_PATH_MAX];
+ char target[SYSFS_PATH_MAX];
+ char *bus = NULL, *c;
+ struct dlist *buslist;
- if (dev == NULL) {
+ if (!dev) {
errno = EINVAL;
return -1;
}
+ memset(path, 0, SYSFS_PATH_MAX);
+ memset(devpath, 0, SYSFS_PATH_MAX);
+ safestrcpymax(path, dev->path, SYSFS_PATH_MAX);
+ safestrcatmax(path, "/bus", SYSFS_PATH_MAX);
+ if (!sysfs_path_is_link(path)) {
+ if (!sysfs_get_link(path, devpath, SYSFS_PATH_MAX)) {
+ if (sysfs_get_name_from_path(devpath,
+ dev->bus, SYSFS_NAME_LEN))
+ return -1;
+ }
+ return 0;
+ }
+
+ /*
+ * Devices on on earlier kernels do not have the "bus" link.
+ * Look it up in the bus directory.
+ */
memset(subsys, 0, SYSFS_NAME_LEN);
- safestrcpy(subsys, SYSFS_BUS_NAME); /* subsys = bus */
- buslist = sysfs_open_subsystem_list(subsys);
- if (buslist != NULL) {
+ safestrcpy(subsys, dev->path);
+ c = strstr(subsys, SYSFS_DEVICES_NAME);
+ if (c == NULL) {
+ dprintf("Invalid path to device - %s\n", dev->path);
+ return -1;
+ } else
+ *c = '\0';
+ safestrcat(subsys, SYSFS_BUS_NAME);
+ buslist = sysfs_open_directory_list(subsys);
+ if (buslist) {
dlist_for_each_data(buslist, bus, char) {
memset(path, 0, SYSFS_PATH_MAX);
- safestrcpy(path, dev->path);
- c = strstr(path, "/devices");
- if (c == NULL) {
- dprintf("Invalid path to device %s\n", path);
- sysfs_close_list(buslist);
- return -1;
- }
- *c = '\0';
- safestrcat(path, "/");
- safestrcat(path, SYSFS_BUS_NAME);
+ safestrcpy(path, subsys);
safestrcat(path, "/");
safestrcat(path, bus);
safestrcat(path, "/");
safestrcat(path, dev->bus_id);
if ((sysfs_path_is_link(path)) == 0) {
memset(target, 0, SYSFS_PATH_MAX);
- if ((sysfs_get_link(path, target,
- SYSFS_PATH_MAX)) != 0) {
+ if (sysfs_get_link(path, target,
+ SYSFS_PATH_MAX)) {
dprintf("Error getting link target\n");
sysfs_close_list(buslist);
return -1;
return 0;
}
}
- }
- sysfs_close_list(buslist);
- }
- return -1;
+ }
+ sysfs_close_list(buslist);
+ }
+ return -1;
}
/**
*/
void sysfs_close_device_tree(struct sysfs_device *devroot)
{
- if (devroot != NULL) {
- if (devroot->children != NULL) {
+ if (devroot) {
+ if (devroot->children) {
struct sysfs_device *child = NULL;
dlist_for_each_data(devroot->children, child,
}
}
-/**
- * sysfs_close_dev_tree: routine for dlist integration
- */
-static void sysfs_close_dev_tree(void *dev)
-{
- sysfs_close_device_tree((struct sysfs_device *)dev);
-}
-
/**
* 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) {
- if (dev->parent != NULL)
+ if (dev) {
+ if (dev->parent)
sysfs_close_device(dev->parent);
- if (dev->directory != NULL)
- sysfs_close_directory(dev->directory);
- if (dev->children != NULL && dev->children->count == 0)
+ if (dev->children && dev->children->count)
dlist_destroy(dev->children);
+ if (dev->attrlist)
+ dlist_destroy(dev->attrlist);
free(dev);
}
}
*/
static struct sysfs_device *alloc_device(void)
{
- return (struct sysfs_device *)calloc(1, sizeof(struct sysfs_device));
-}
-
-/**
- * open_device_dir: opens up sysfs_directory for specific root dev
- * @name: name of root
- * returns struct sysfs_directory with success and NULL with error
- */
-static struct sysfs_directory *open_device_dir(const char *path)
-{
- struct sysfs_directory *rdir = NULL;
-
- if (path == NULL) {
- errno = EINVAL;
- return NULL;
- }
-
- rdir = sysfs_open_directory(path);
- if (rdir == NULL) {
- errno = EINVAL;
- dprintf ("Device %s not supported on this system\n", path);
- return NULL;
- }
- if ((sysfs_read_dir_subdirs(rdir)) != 0) {
- dprintf ("Error reading device at dir %s\n", path);
- sysfs_close_directory(rdir);
- return NULL;
- }
-
- return rdir;
+ return (struct sysfs_device *) calloc(1, sizeof(struct sysfs_device));
}
/**
*/
struct sysfs_device *sysfs_open_device_path(const char *path)
{
- struct sysfs_device *dev = NULL;
+ struct sysfs_device *dev;
- if (path == NULL) {
+ if (!path) {
errno = EINVAL;
return NULL;
}
- if ((sysfs_path_is_dir(path)) != 0) {
+ if (sysfs_path_is_dir(path)) {
dprintf("Incorrect path to device: %s\n", path);
return NULL;
}
- dev = alloc_device();
- if (dev == NULL) {
+ dev = alloc_device();
+ if (!dev) {
dprintf("Error allocating device at %s\n", path);
return NULL;
}
- if ((sysfs_get_name_from_path(path, dev->bus_id,
- SYSFS_NAME_LEN)) != 0) {
+ if (sysfs_get_name_from_path(path, dev->bus_id, SYSFS_NAME_LEN)) {
errno = EINVAL;
dprintf("Error getting device bus_id\n");
sysfs_close_device(dev);
return NULL;
}
safestrcpy(dev->path, path);
- if ((sysfs_remove_trailing_slash(dev->path)) != 0) {
+ if (sysfs_remove_trailing_slash(dev->path)) {
dprintf("Invalid path to device %s\n", dev->path);
sysfs_close_device(dev);
return NULL;
}
- /*
+ /*
* The "name" attribute no longer exists... return the device's
* sysfs representation instead, in the "dev->name" field, which
* implies that the dev->name and dev->bus_id contain same data.
*/
safestrcpy(dev->name, dev->bus_id);
-
- if (sysfs_get_device_bus(dev) != 0)
+
+ if (sysfs_get_device_bus(dev))
dprintf("Could not get device bus\n");
-
- if (get_device_driver_name(dev) != 0) {
+
+ if (get_dev_driver(dev)) {
dprintf("Could not get device %s's driver\n", dev->bus_id);
safestrcpy(dev->driver_name, SYSFS_UNKNOWN);
}
}
/**
- * 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(path);
- if (rootdev == NULL) {
- dprintf("Error opening root device at %s\n", path);
- return NULL;
- }
- if (rootdev->directory == NULL) {
- rootdev->directory = open_device_dir(rootdev->path);
- if (rootdev->directory == NULL)
- return NULL;
- }
- if (rootdev->directory->subdirs != NULL) {
- dlist_for_each_data(rootdev->directory->subdirs, cur,
- struct sysfs_directory) {
- new = sysfs_open_device_tree(cur->path);
- if (new == NULL) {
- dprintf("Error opening device tree at %s\n",
- cur->path);
- sysfs_close_device_tree(rootdev);
- return NULL;
- }
- if (rootdev->children == NULL)
- rootdev->children = dlist_new_with_delete
- (sizeof(struct sysfs_device),
- sysfs_close_dev_tree);
- dlist_unshift_sorted(rootdev->children,
- new, sort_list);
- }
- }
-
- return rootdev;
-}
-
-/**
- * sysfs_close_root_device: closes root and all devices
- * @root: root device to close
- */
-void sysfs_close_root_device(struct sysfs_root_device *root)
-{
- if (root != NULL) {
- if (root->devices != NULL)
- dlist_destroy(root->devices);
- if (root->directory != NULL)
- sysfs_close_directory(root->directory);
- free(root);
- }
-}
-
-/**
- * sysfs_get_root_devices: opens up all the devices under this root device
- * @root: root device to open devices for
- * returns dlist of devices with success and NULL with error
- */
-struct dlist *sysfs_get_root_devices(struct sysfs_root_device *root)
-{
- struct sysfs_device *dev = NULL;
- struct sysfs_directory *cur = NULL;
-
- if (root == NULL) {
- errno = EINVAL;
- return NULL;
- }
- if (root->directory == NULL) {
- root->directory = open_device_dir(root->path);
- if (root->directory == NULL)
- return NULL;
- }
-
- if (root->directory->subdirs == NULL)
- return 0;
-
- dlist_for_each_data(root->directory->subdirs, cur,
- struct sysfs_directory) {
- dev = sysfs_open_device_tree(cur->path);
- if (dev == NULL) {
- dprintf ("Error opening device at %s\n", cur->path);
- continue;
- }
- if (root->devices == NULL)
- root->devices = dlist_new_with_delete
- (sizeof(struct sysfs_device),
- sysfs_close_dev_tree);
- dlist_unshift_sorted(root->devices, dev, sort_list);
- }
-
- return root->devices;
-}
-
-/**
- * sysfs_open_root_device: opens sysfs devices root and all of its
- * devices.
- * @name: name of /sys/devices/root to open
- * returns struct sysfs_root_device if success and NULL with error
- */
-struct sysfs_root_device *sysfs_open_root_device(const char *name)
-{
- struct sysfs_root_device *root = NULL;
- char rootpath[SYSFS_PATH_MAX];
-
- if (name == NULL) {
- errno = EINVAL;
- return NULL;
- }
-
- memset(rootpath, 0, SYSFS_PATH_MAX);
- if (sysfs_get_mnt_path(rootpath, SYSFS_PATH_MAX) != 0) {
- dprintf ("Sysfs not supported on this system\n");
- return NULL;
- }
-
- safestrcat(rootpath, "/");
- safestrcat(rootpath, SYSFS_DEVICES_NAME);
- safestrcat(rootpath, "/");
- safestrcat(rootpath, name);
- if ((sysfs_path_is_dir(rootpath)) != 0) {
- errno = EINVAL;
- dprintf("Invalid root device: %s\n", name);
- return NULL;
- }
- root = (struct sysfs_root_device *)calloc
- (1, sizeof(struct sysfs_root_device));
- if (root == NULL) {
- dprintf("calloc failure\n");
- return NULL;
- }
- safestrcpy(root->name, name);
- safestrcpy(root->path, rootpath);
- if ((sysfs_remove_trailing_slash(root->path)) != 0) {
- dprintf("Invalid path to root device %s\n", root->path);
- sysfs_close_root_device(root);
- return NULL;
- }
- return root;
-}
-
-/**
- * sysfs_get_device_attributes: returns a dlist of attributes corresponding to
- * the specific device
- * @device: struct sysfs_device * for which attributes are to be returned
- */
-struct dlist *sysfs_get_device_attributes(struct sysfs_device *device)
-{
- if (device == NULL) {
- errno = EINVAL;
- return NULL;
- }
-
- if (device->directory == NULL) {
- device->directory = sysfs_open_directory(device->path);
- if (device->directory == NULL)
- return NULL;
- }
- if (device->directory->attributes == NULL) {
- if ((sysfs_read_dir_attributes(device->directory)) != 0)
- return NULL;
- }
- return (device->directory->attributes);
-}
-
-/**
- * sysfs_refresh_device_attributes: refreshes the device's list of attributes
- * @device: sysfs_device whose attributes to refresh
- *
- * NOTE: Upon return, prior references to sysfs_attributes for this device
- * _may_ not be valid
- *
- * Returns list of attributes on success and NULL on failure
+ * 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 dlist *sysfs_refresh_device_attributes(struct sysfs_device *device)
+struct sysfs_attribute *sysfs_get_device_attr(struct sysfs_device *dev,
+ const char *name)
{
- if (device == NULL) {
+ if (!dev || !name) {
errno = EINVAL;
return NULL;
}
-
- if (device->directory == NULL)
- return (sysfs_get_device_attributes(device));
-
- if ((sysfs_refresh_dir_attributes(device->directory)) != 0) {
- dprintf("Error refreshing device attributes\n");
- return NULL;
- }
-
- return (device->directory->attributes);
+ return get_attribute(dev, (char *)name);
}
/**
- * 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.
+ * sysfs_get_device_attributes: gets list of device attributes
+ * @dev: device whose attributes list is needed
+ * returns dlist of attributes on success or NULL on error
*/
-struct sysfs_attribute *sysfs_get_device_attr(struct sysfs_device *dev,
- const char *name)
+struct dlist *sysfs_get_device_attributes(struct sysfs_device *dev)
{
- struct dlist *attrlist = NULL;
-
- if (dev == NULL || name == NULL) {
+ if (!dev) {
errno = EINVAL;
return NULL;
}
-
- attrlist = sysfs_get_device_attributes(dev);
- if (attrlist == NULL)
- return NULL;
-
- return sysfs_get_directory_attribute(dev->directory, (char *)name);
+ return get_attributes_list(dev);
}
/**
{
char bus_path[SYSFS_PATH_MAX];
- if (device == NULL || path == NULL) {
+ if (!device || !path) {
errno = EINVAL;
return -1;
}
memset(bus_path, 0, SYSFS_PATH_MAX);
- if (sysfs_get_mnt_path(bus_path, SYSFS_PATH_MAX) != 0) {
+ if (sysfs_get_mnt_path(bus_path, SYSFS_PATH_MAX)) {
dprintf ("Sysfs not supported on this system\n");
return -1;
}
* We now are at /sys/bus/"bus_name"/devices/"device" which is a link.
* Now read this link to reach to the device.
*/
- if ((sysfs_get_link(bus_path, path, psize)) != 0) {
+ if (sysfs_get_link(bus_path, path, psize)) {
dprintf("Error getting to device %s\n", device);
return -1;
}
struct sysfs_device *sysfs_open_device(const char *bus, const char *bus_id)
{
char sysfs_path[SYSFS_PATH_MAX];
- struct sysfs_device *device = NULL;
+ struct sysfs_device *device;
- if (bus_id == NULL || bus == NULL) {
+ if (!bus_id || !bus) {
errno = EINVAL;
return NULL;
}
memset(sysfs_path, 0, SYSFS_PATH_MAX);
- if ((get_device_absolute_path(bus_id, bus, sysfs_path,
- SYSFS_PATH_MAX)) != 0) {
+ if (get_device_absolute_path(bus_id, bus, sysfs_path,
+ SYSFS_PATH_MAX)) {
dprintf("Error getting to device %s\n", bus_id);
return NULL;
}
device = sysfs_open_device_path(sysfs_path);
- if (device == NULL) {
+ if (!device) {
dprintf("Error opening device %s\n", bus_id);
return NULL;
}
*/
struct sysfs_device *sysfs_get_device_parent(struct sysfs_device *dev)
{
- char ppath[SYSFS_PATH_MAX], *tmp = NULL;
+ char ppath[SYSFS_PATH_MAX], *tmp;
- if (dev == NULL) {
+ if (!dev) {
errno = EINVAL;
return NULL;
}
- if (dev->parent != NULL)
+ if (dev->parent)
return (dev->parent);
memset(ppath, 0, SYSFS_PATH_MAX);
safestrcpy(ppath, dev->path);
tmp = strrchr(ppath, '/');
- if (tmp == NULL) {
+ if (!tmp) {
dprintf("Invalid path to device %s\n", ppath);
return NULL;
}
}
}
*tmp = '\0';
-
+
/*
* All "devices" have the "detach_state" attribute - validate here
*/
safestrcat(ppath, "/detach_state");
- if ((sysfs_path_is_file(ppath)) != 0) {
+ if (sysfs_path_is_file(ppath)) {
dprintf("Device at %s does not have a parent\n", dev->path);
return NULL;
}
tmp = strrchr(ppath, '/');
*tmp = '\0';
dev->parent = sysfs_open_device_path(ppath);
- if (dev->parent == NULL) {
+ if (!dev->parent) {
dprintf("Error opening device %s's parent at %s\n",
dev->bus_id, ppath);
return NULL;
}
return (dev->parent);
}
-
-/*
- * sysfs_open_device_attr: open the given device's attribute
- * @bus: Bus on which to look
- * @dev_id: device for which attribute is required
- * @attrname: name of the attribute to look for
- * Returns struct sysfs_attribute on success and NULL on failure
- *
- * NOTE:
- * A call to sysfs_close_attribute() is required to close
- * the attribute returned and free memory.
- */
-struct sysfs_attribute *sysfs_open_device_attr(const char *bus,
- const char *bus_id, const char *attrib)
-{
- struct sysfs_attribute *attribute = NULL;
- char devpath[SYSFS_PATH_MAX];
-
- if (bus == NULL || bus_id == NULL || attrib == NULL) {
- errno = EINVAL;
- return NULL;
- }
-
- memset(devpath, 0, SYSFS_PATH_MAX);
- if ((get_device_absolute_path(bus_id, bus, devpath,
- SYSFS_PATH_MAX)) != 0) {
- dprintf("Error getting to device %s\n", bus_id);
- return NULL;
- }
- safestrcat(devpath, "/");
- safestrcat(devpath, attrib);
- attribute = sysfs_open_attribute(devpath);
- if (attribute == NULL) {
- dprintf("Error opening attribute %s for device %s\n",
- attrib, bus_id);
- return NULL;
- }
- if ((sysfs_read_attribute(attribute)) != 0) {
- dprintf("Error reading attribute %s for device %s\n",
- attrib, bus_id);
- sysfs_close_attribute(attribute);
- return NULL;
- }
- return attribute;
-}
-
~ianmdlvl / elogind.git / blobdiff