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Diffstat (limited to 'libsysfs/sysfs_device.c')
-rw-r--r--libsysfs/sysfs_device.c174
1 files changed, 115 insertions, 59 deletions
diff --git a/libsysfs/sysfs_device.c b/libsysfs/sysfs_device.c
index 06b8d2d99a..e3a8977016 100644
--- a/libsysfs/sysfs_device.c
+++ b/libsysfs/sysfs_device.c
@@ -24,6 +24,57 @@
#include "sysfs.h"
/**
+ * 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) {
+ errno = EINVAL;
+ return 1;
+ }
+ if (dev->bus[0] == '\0')
+ return 1;
+ memset(path, 0, SYSFS_PATH_MAX);
+ memset(devpath, 0, SYSFS_PATH_MAX);
+ safestrcpy(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';
+ safestrncat(c, path, (sizeof(devpath) - strlen(devpath)));
+
+ drvlist = sysfs_open_subsystem_list(path);
+ if (drvlist != NULL) {
+ 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(dev->driver_name, drv);
+ sysfs_close_list(drvlist);
+ return 0;
+ }
+ }
+ sysfs_close_list(drvlist);
+ }
+ return 1;
+}
+
+/**
* sysfs_get_device_bus: retrieves the bus name the device is on, checks path
* to bus' link to make sure it has correct device.
* @dev: device to get busname.
@@ -31,8 +82,8 @@
*/
int sysfs_get_device_bus(struct sysfs_device *dev)
{
- unsigned char subsys[SYSFS_NAME_LEN], path[SYSFS_PATH_MAX];
- unsigned char target[SYSFS_PATH_MAX], *bus = NULL, *c = NULL;
+ char subsys[SYSFS_NAME_LEN], path[SYSFS_PATH_MAX];
+ char target[SYSFS_PATH_MAX], *bus = NULL, *c = NULL;
struct dlist *buslist = NULL;
if (dev == NULL) {
@@ -41,13 +92,12 @@ int sysfs_get_device_bus(struct sysfs_device *dev)
}
memset(subsys, 0, SYSFS_NAME_LEN);
- strcat(subsys, "/");
- strcpy(subsys, SYSFS_BUS_NAME); /* subsys = /bus */
+ safestrcpy(subsys, SYSFS_BUS_NAME); /* subsys = bus */
buslist = sysfs_open_subsystem_list(subsys);
if (buslist != NULL) {
dlist_for_each_data(buslist, bus, char) {
memset(path, 0, SYSFS_PATH_MAX);
- strcpy(path, dev->path);
+ safestrcpy(path, dev->path);
c = strstr(path, "/devices");
if (c == NULL) {
dprintf("Invalid path to device %s\n", path);
@@ -55,25 +105,25 @@ int sysfs_get_device_bus(struct sysfs_device *dev)
return -1;
}
*c = '\0';
- strcat(path, "/");
- strcat(path, SYSFS_BUS_NAME);
- strcat(path, "/");
- strcat(path, bus);
- strcat(path, "/");
- strcat(path, SYSFS_DEVICES_NAME);
- strcat(path, "/");
- strcat(path, dev->bus_id);
+ safestrcat(path, "/");
+ safestrcat(path, SYSFS_BUS_NAME);
+ safestrcat(path, "/");
+ safestrcat(path, bus);
+ safestrcat(path, "/");
+ safestrcat(path, SYSFS_DEVICES_NAME);
+ 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) {
+ SYSFS_PATH_MAX)) != 0) {
dprintf("Error getting link target\n");
sysfs_close_list(buslist);
return -1;
}
if (!(strncmp(target, dev->path,
SYSFS_PATH_MAX))) {
- strcpy(dev->bus, bus);
+ safestrcpy(dev->bus, bus);
sysfs_close_list(buslist);
return 0;
}
@@ -89,7 +139,7 @@ int sysfs_get_device_bus(struct sysfs_device *dev)
* closing children only.
* @devroot: device root of tree.
*/
-static void sysfs_close_device_tree(struct sysfs_device *devroot)
+void sysfs_close_device_tree(struct sysfs_device *devroot)
{
if (devroot != NULL) {
if (devroot->children != NULL) {
@@ -143,7 +193,7 @@ static struct sysfs_device *alloc_device(void)
* @name: name of root
* returns struct sysfs_directory with success and NULL with error
*/
-static struct sysfs_directory *open_device_dir(const unsigned char *path)
+static struct sysfs_directory *open_device_dir(const char *path)
{
struct sysfs_directory *rdir = NULL;
@@ -172,7 +222,7 @@ static struct sysfs_directory *open_device_dir(const unsigned char *path)
* @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_path(const unsigned char *path)
+struct sysfs_device *sysfs_open_device_path(const char *path)
{
struct sysfs_device *dev = NULL;
@@ -196,7 +246,7 @@ struct sysfs_device *sysfs_open_device_path(const unsigned char *path)
sysfs_close_device(dev);
return NULL;
}
- strcpy(dev->path, path);
+ safestrcpy(dev->path, path);
if ((sysfs_remove_trailing_slash(dev->path)) != 0) {
dprintf("Invalid path to device %s\n", dev->path);
sysfs_close_device(dev);
@@ -207,10 +257,15 @@ struct sysfs_device *sysfs_open_device_path(const unsigned char *path)
* sysfs representation instead, in the "dev->name" field, which
* implies that the dev->name and dev->bus_id contain same data.
*/
- strncpy(dev->name, dev->bus_id, SYSFS_NAME_LEN);
+ safestrcpy(dev->name, dev->bus_id);
if (sysfs_get_device_bus(dev) != 0)
dprintf("Could not get device bus\n");
+
+ if (get_dev_driver(dev) != 0) {
+ dprintf("Could not get device %s's driver\n", dev->bus_id);
+ safestrcpy(dev->driver_name, SYSFS_UNKNOWN);
+ }
return dev;
}
@@ -222,7 +277,7 @@ struct sysfs_device *sysfs_open_device_path(const unsigned char *path)
* returns struct sysfs_device and its children with success or NULL with
* error.
*/
-static struct sysfs_device *sysfs_open_device_tree(const unsigned char *path)
+struct sysfs_device *sysfs_open_device_tree(const char *path)
{
struct sysfs_device *rootdev = NULL, *new = NULL;
struct sysfs_directory *cur = NULL;
@@ -255,7 +310,8 @@ static struct sysfs_device *sysfs_open_device_tree(const unsigned char *path)
rootdev->children = dlist_new_with_delete
(sizeof(struct sysfs_device),
sysfs_close_dev_tree);
- dlist_unshift(rootdev->children, new);
+ dlist_unshift_sorted(rootdev->children,
+ new, sort_list);
}
}
@@ -311,7 +367,7 @@ struct dlist *sysfs_get_root_devices(struct sysfs_root_device *root)
root->devices = dlist_new_with_delete
(sizeof(struct sysfs_device),
sysfs_close_dev_tree);
- dlist_unshift(root->devices, dev);
+ dlist_unshift_sorted(root->devices, dev, sort_list);
}
return root->devices;
@@ -323,10 +379,10 @@ struct dlist *sysfs_get_root_devices(struct sysfs_root_device *root)
* @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 unsigned char *name)
+struct sysfs_root_device *sysfs_open_root_device(const char *name)
{
struct sysfs_root_device *root = NULL;
- unsigned char rootpath[SYSFS_PATH_MAX];
+ char rootpath[SYSFS_PATH_MAX];
if (name == NULL) {
errno = EINVAL;
@@ -339,10 +395,10 @@ struct sysfs_root_device *sysfs_open_root_device(const unsigned char *name)
return NULL;
}
- strcat(rootpath, "/");
- strcat(rootpath, SYSFS_DEVICES_NAME);
- strcat(rootpath, "/");
- strcat(rootpath, name);
+ 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);
@@ -354,8 +410,8 @@ struct sysfs_root_device *sysfs_open_root_device(const unsigned char *name)
dprintf("calloc failure\n");
return NULL;
}
- strcpy(root->name, name);
- strcpy(root->path, rootpath);
+ 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);
@@ -371,8 +427,10 @@ struct sysfs_root_device *sysfs_open_root_device(const unsigned char *name)
*/
struct dlist *sysfs_get_device_attributes(struct sysfs_device *device)
{
- if (device == NULL)
+ if (device == NULL) {
+ errno = EINVAL;
return NULL;
+ }
if (device->directory == NULL) {
device->directory = sysfs_open_directory(device->path);
@@ -420,7 +478,7 @@ struct dlist *sysfs_refresh_device_attributes(struct sysfs_device *device)
* returns sysfs_attribute reference with success or NULL with error.
*/
struct sysfs_attribute *sysfs_get_device_attr(struct sysfs_device *dev,
- const unsigned char *name)
+ const char *name)
{
struct dlist *attrlist = NULL;
@@ -433,8 +491,7 @@ struct sysfs_attribute *sysfs_get_device_attr(struct sysfs_device *dev,
if (attrlist == NULL)
return NULL;
- return sysfs_get_directory_attribute(dev->directory,
- (unsigned char *)name);
+ return sysfs_get_directory_attribute(dev->directory, (char *)name);
}
/**
@@ -445,10 +502,10 @@ struct sysfs_attribute *sysfs_get_device_attr(struct sysfs_device *dev,
* @psize: size of "path"
* Returns 0 on success -1 on failure
*/
-static int get_device_absolute_path(const unsigned char *device,
- const unsigned char *bus, unsigned char *path, size_t psize)
+static int get_device_absolute_path(const char *device, const char *bus,
+ char *path, size_t psize)
{
- unsigned char bus_path[SYSFS_PATH_MAX];
+ char bus_path[SYSFS_PATH_MAX];
if (device == NULL || path == NULL) {
errno = EINVAL;
@@ -460,19 +517,19 @@ static int get_device_absolute_path(const unsigned char *device,
dprintf ("Sysfs not supported on this system\n");
return -1;
}
- strcat(bus_path, "/");
- strcat(bus_path, SYSFS_BUS_NAME);
- strcat(bus_path, "/");
- strcat(bus_path, bus);
- strcat(bus_path, "/");
- strcat(bus_path, SYSFS_DEVICES_NAME);
- strcat(bus_path, "/");
- strcat(bus_path, device);
+ safestrcat(bus_path, "/");
+ safestrcat(bus_path, SYSFS_BUS_NAME);
+ safestrcat(bus_path, "/");
+ safestrcat(bus_path, bus);
+ safestrcat(bus_path, "/");
+ safestrcat(bus_path, SYSFS_DEVICES_NAME);
+ safestrcat(bus_path, "/");
+ safestrcat(bus_path, device);
/*
* 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, SYSFS_PATH_MAX)) != 0) {
+ if ((sysfs_get_link(bus_path, path, psize)) != 0) {
dprintf("Error getting to device %s\n", device);
return -1;
}
@@ -481,17 +538,16 @@ static int get_device_absolute_path(const unsigned char *device,
/**
* sysfs_open_device: open a device by id (use the "bus" subsystem)
+ * @bus: bus the device belongs to
* @bus_id: bus_id of the device to open - has to be the "bus_id" in
* /sys/bus/xxx/devices
- * @bus: bus the device belongs to
* returns struct sysfs_device if found, NULL otherwise
* NOTE:
* 1. Use sysfs_close_device to close the device
* 2. Bus the device is on must be supplied
* Use sysfs_find_device_bus to get the bus name
*/
-struct sysfs_device *sysfs_open_device(const unsigned char *bus_id,
- const unsigned char *bus)
+struct sysfs_device *sysfs_open_device(const char *bus, const char *bus_id)
{
char sysfs_path[SYSFS_PATH_MAX];
struct sysfs_device *device = NULL;
@@ -524,7 +580,7 @@ struct sysfs_device *sysfs_open_device(const unsigned char *bus_id,
*/
struct sysfs_device *sysfs_get_device_parent(struct sysfs_device *dev)
{
- unsigned char ppath[SYSFS_PATH_MAX], *tmp = NULL;
+ char ppath[SYSFS_PATH_MAX], *tmp = NULL;
if (dev == NULL) {
errno = EINVAL;
@@ -535,13 +591,13 @@ struct sysfs_device *sysfs_get_device_parent(struct sysfs_device *dev)
return (dev->parent);
memset(ppath, 0, SYSFS_PATH_MAX);
- strcpy(ppath, dev->path);
+ safestrcpy(ppath, dev->path);
tmp = strrchr(ppath, '/');
if (tmp == NULL) {
dprintf("Invalid path to device %s\n", ppath);
return NULL;
}
- if (*(tmp +1) == '\0') {
+ if (*(tmp + 1) == '\0') {
*tmp = '\0';
tmp = strrchr(tmp, '/');
if (tmp == NULL) {
@@ -554,7 +610,7 @@ struct sysfs_device *sysfs_get_device_parent(struct sysfs_device *dev)
/*
* All "devices" have the "detach_state" attribute - validate here
*/
- strcat(ppath, "/detach_state");
+ safestrcat(ppath, "/detach_state");
if ((sysfs_path_is_file(ppath)) != 0) {
dprintf("Device at %s does not have a parent\n", dev->path);
return NULL;
@@ -581,11 +637,11 @@ struct sysfs_device *sysfs_get_device_parent(struct sysfs_device *dev)
* A call to sysfs_close_attribute() is required to close
* the attribute returned and free memory.
*/
-struct sysfs_attribute *sysfs_open_device_attr(const unsigned char *bus,
- const unsigned char *bus_id, const unsigned char *attrib)
+struct sysfs_attribute *sysfs_open_device_attr(const char *bus,
+ const char *bus_id, const char *attrib)
{
struct sysfs_attribute *attribute = NULL;
- unsigned char devpath[SYSFS_PATH_MAX];
+ char devpath[SYSFS_PATH_MAX];
if (bus == NULL || bus_id == NULL || attrib == NULL) {
errno = EINVAL;
@@ -598,8 +654,8 @@ struct sysfs_attribute *sysfs_open_device_attr(const unsigned char *bus,
dprintf("Error getting to device %s\n", bus_id);
return NULL;
}
- strcat(devpath, "/");
- strcat(devpath, attrib);
+ safestrcat(devpath, "/");
+ safestrcat(devpath, attrib);
attribute = sysfs_open_attribute(devpath);
if (attribute == NULL) {
dprintf("Error opening attribute %s for device %s\n",
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-25 15:29:07 +0000