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Diffstat (limited to 'udev/udev_sysfs.c')
-rw-r--r--udev/udev_sysfs.c106
1 files changed, 48 insertions, 58 deletions
diff --git a/udev/udev_sysfs.c b/udev/udev_sysfs.c
index 91f5997d0c..f0dfd7f4be 100644
--- a/udev/udev_sysfs.c
+++ b/udev/udev_sysfs.c
@@ -29,13 +29,12 @@
#include "udev.h"
-char sysfs_path[PATH_SIZE];
-
/* device cache */
static LIST_HEAD(dev_list);
/* attribute value cache */
static LIST_HEAD(attr_list);
+
struct sysfs_attr {
struct list_head node;
char path[PATH_SIZE];
@@ -45,16 +44,6 @@ struct sysfs_attr {
int sysfs_init(void)
{
- const char *env;
-
- env = getenv("SYSFS_PATH");
- if (env) {
- strlcpy(sysfs_path, env, sizeof(sysfs_path));
- remove_trailing_chars(sysfs_path, '/');
- } else
- strlcpy(sysfs_path, "/sys", sizeof(sysfs_path));
- dbg("sysfs_path='%s'\n", sysfs_path);
-
INIT_LIST_HEAD(&dev_list);
INIT_LIST_HEAD(&attr_list);
return 0;
@@ -78,7 +67,8 @@ void sysfs_cleanup(void)
}
}
-void sysfs_device_set_values(struct sysfs_device *dev, const char *devpath,
+void sysfs_device_set_values(struct udev *udev,
+ struct sysfs_device *dev, const char *devpath,
const char *subsystem, const char *driver)
{
char *pos;
@@ -94,7 +84,7 @@ void sysfs_device_set_values(struct sysfs_device *dev, const char *devpath,
if (pos == NULL)
return;
strlcpy(dev->kernel, &pos[1], sizeof(dev->kernel));
- dbg("kernel='%s'\n", dev->kernel);
+ dbg(udev, "kernel='%s'\n", dev->kernel);
/* some devices have '!' in their name, change that to '/' */
pos = dev->kernel;
@@ -109,10 +99,10 @@ void sysfs_device_set_values(struct sysfs_device *dev, const char *devpath,
while (isdigit(pos[-1]))
pos--;
strlcpy(dev->kernel_number, pos, sizeof(dev->kernel_number));
- dbg("kernel_number='%s'\n", dev->kernel_number);
+ dbg(udev, "kernel_number='%s'\n", dev->kernel_number);
}
-int sysfs_resolve_link(char *devpath, size_t size)
+int sysfs_resolve_link(struct udev *udev, char *devpath, size_t size)
{
char link_path[PATH_SIZE];
char link_target[PATH_SIZE];
@@ -120,17 +110,17 @@ int sysfs_resolve_link(char *devpath, size_t size)
int i;
int back;
- strlcpy(link_path, sysfs_path, sizeof(link_path));
+ strlcpy(link_path, udev_get_sys_path(udev), sizeof(link_path));
strlcat(link_path, devpath, sizeof(link_path));
len = readlink(link_path, link_target, sizeof(link_target));
if (len <= 0)
return -1;
link_target[len] = '\0';
- dbg("path link '%s' points to '%s'\n", devpath, link_target);
+ dbg(udev, "path link '%s' points to '%s'\n", devpath, link_target);
for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; back++)
;
- dbg("base '%s', tail '%s', back %i\n", devpath, &link_target[back * 3], back);
+ dbg(udev, "base '%s', tail '%s', back %i\n", devpath, &link_target[back * 3], back);
for (i = 0; i <= back; i++) {
char *pos = strrchr(devpath, '/');
@@ -138,13 +128,13 @@ int sysfs_resolve_link(char *devpath, size_t size)
return -1;
pos[0] = '\0';
}
- dbg("after moving back '%s'\n", devpath);
+ dbg(udev, "after moving back '%s'\n", devpath);
strlcat(devpath, "/", size);
strlcat(devpath, &link_target[back * 3], size);
return 0;
}
-struct sysfs_device *sysfs_device_get(const char *devpath)
+struct sysfs_device *sysfs_device_get(struct udev *udev, const char *devpath)
{
char path[PATH_SIZE];
char devpath_real[PATH_SIZE];
@@ -166,7 +156,7 @@ struct sysfs_device *sysfs_device_get(const char *devpath)
strncmp(devpath, "/block/", 7) != 0)
return NULL;
- dbg("open '%s'\n", devpath);
+ dbg(udev, "open '%s'\n", devpath);
strlcpy(devpath_real, devpath, sizeof(devpath_real));
remove_trailing_chars(devpath_real, '/');
if (devpath[0] == '\0' )
@@ -175,49 +165,49 @@ struct sysfs_device *sysfs_device_get(const char *devpath)
/* look for device already in cache (we never put an untranslated path in the cache) */
list_for_each_entry(dev_loop, &dev_list, node) {
if (strcmp(dev_loop->devpath, devpath_real) == 0) {
- dbg("found in cache '%s'\n", dev_loop->devpath);
+ dbg(udev, "found in cache '%s'\n", dev_loop->devpath);
return dev_loop;
}
}
/* if we got a link, resolve it to the real device */
- strlcpy(path, sysfs_path, sizeof(path));
+ strlcpy(path, udev_get_sys_path(udev), sizeof(path));
strlcat(path, devpath_real, sizeof(path));
if (lstat(path, &statbuf) != 0) {
- dbg("stat '%s' failed: %s\n", path, strerror(errno));
+ dbg(udev, "stat '%s' failed: %s\n", path, strerror(errno));
return NULL;
}
if (S_ISLNK(statbuf.st_mode)) {
- if (sysfs_resolve_link(devpath_real, sizeof(devpath_real)) != 0)
+ if (sysfs_resolve_link(udev, devpath_real, sizeof(devpath_real)) != 0)
return NULL;
/* now look for device in cache after path translation */
list_for_each_entry(dev_loop, &dev_list, node) {
if (strcmp(dev_loop->devpath, devpath_real) == 0) {
- dbg("found in cache '%s'\n", dev_loop->devpath);
+ dbg(udev, "found in cache '%s'\n", dev_loop->devpath);
return dev_loop;
}
}
}
/* it is a new device */
- dbg("new uncached device '%s'\n", devpath_real);
+ dbg(udev, "new uncached device '%s'\n", devpath_real);
dev = malloc(sizeof(struct sysfs_device));
if (dev == NULL)
return NULL;
memset(dev, 0x00, sizeof(struct sysfs_device));
- sysfs_device_set_values(dev, devpath_real, NULL, NULL);
+ sysfs_device_set_values(udev, dev, devpath_real, NULL, NULL);
/* get subsystem name */
- strlcpy(link_path, sysfs_path, sizeof(link_path));
+ strlcpy(link_path, udev_get_sys_path(udev), sizeof(link_path));
strlcat(link_path, dev->devpath, sizeof(link_path));
strlcat(link_path, "/subsystem", sizeof(link_path));
len = readlink(link_path, link_target, sizeof(link_target));
if (len > 0) {
/* get subsystem from "subsystem" link */
link_target[len] = '\0';
- dbg("subsystem link '%s' points to '%s'\n", link_path, link_target);
+ dbg(udev, "subsystem link '%s' points to '%s'\n", link_path, link_target);
pos = strrchr(link_target, '/');
if (pos != NULL)
strlcpy(dev->subsystem, &pos[1], sizeof(dev->subsystem));
@@ -240,37 +230,37 @@ struct sysfs_device *sysfs_device_get(const char *devpath)
}
/* get driver name */
- strlcpy(link_path, sysfs_path, sizeof(link_path));
+ strlcpy(link_path, udev_get_sys_path(udev), sizeof(link_path));
strlcat(link_path, dev->devpath, sizeof(link_path));
strlcat(link_path, "/driver", sizeof(link_path));
len = readlink(link_path, link_target, sizeof(link_target));
if (len > 0) {
link_target[len] = '\0';
- dbg("driver link '%s' points to '%s'\n", link_path, link_target);
+ dbg(udev, "driver link '%s' points to '%s'\n", link_path, link_target);
pos = strrchr(link_target, '/');
if (pos != NULL)
strlcpy(dev->driver, &pos[1], sizeof(dev->driver));
}
- dbg("add to cache 'devpath=%s', subsystem='%s', driver='%s'\n", dev->devpath, dev->subsystem, dev->driver);
+ dbg(udev, "add to cache 'devpath=%s', subsystem='%s', driver='%s'\n", dev->devpath, dev->subsystem, dev->driver);
list_add(&dev->node, &dev_list);
return dev;
}
-struct sysfs_device *sysfs_device_get_parent(struct sysfs_device *dev)
+struct sysfs_device *sysfs_device_get_parent(struct udev *udev, struct sysfs_device *dev)
{
char parent_devpath[PATH_SIZE];
char *pos;
- dbg("open '%s'\n", dev->devpath);
+ dbg(udev, "open '%s'\n", dev->devpath);
/* look if we already know the parent */
if (dev->parent != NULL)
return dev->parent;
strlcpy(parent_devpath, dev->devpath, sizeof(parent_devpath));
- dbg("'%s'\n", parent_devpath);
+ dbg(udev, "'%s'\n", parent_devpath);
/* strip last element */
pos = strrchr(parent_devpath, '/');
@@ -281,12 +271,12 @@ struct sysfs_device *sysfs_device_get_parent(struct sysfs_device *dev)
if (strncmp(parent_devpath, "/class", 6) == 0) {
pos = strrchr(parent_devpath, '/');
if (pos == &parent_devpath[6] || pos == parent_devpath) {
- dbg("/class top level, look for device link\n");
+ dbg(udev, "/class top level, look for device link\n");
goto device_link;
}
}
if (strcmp(parent_devpath, "/block") == 0) {
- dbg("/block top level, look for device link\n");
+ dbg(udev, "/block top level, look for device link\n");
goto device_link;
}
@@ -296,34 +286,34 @@ struct sysfs_device *sysfs_device_get_parent(struct sysfs_device *dev)
return NULL;
/* get parent and remember it */
- dev->parent = sysfs_device_get(parent_devpath);
+ dev->parent = sysfs_device_get(udev, parent_devpath);
return dev->parent;
device_link:
strlcpy(parent_devpath, dev->devpath, sizeof(parent_devpath));
strlcat(parent_devpath, "/device", sizeof(parent_devpath));
- if (sysfs_resolve_link(parent_devpath, sizeof(parent_devpath)) != 0)
+ if (sysfs_resolve_link(udev, parent_devpath, sizeof(parent_devpath)) != 0)
return NULL;
/* get parent and remember it */
- dev->parent = sysfs_device_get(parent_devpath);
+ dev->parent = sysfs_device_get(udev, parent_devpath);
return dev->parent;
}
-struct sysfs_device *sysfs_device_get_parent_with_subsystem(struct sysfs_device *dev, const char *subsystem)
+struct sysfs_device *sysfs_device_get_parent_with_subsystem(struct udev *udev, struct sysfs_device *dev, const char *subsystem)
{
struct sysfs_device *dev_parent;
- dev_parent = sysfs_device_get_parent(dev);
+ dev_parent = sysfs_device_get_parent(udev, dev);
while (dev_parent != NULL) {
if (strcmp(dev_parent->subsystem, subsystem) == 0)
return dev_parent;
- dev_parent = sysfs_device_get_parent(dev_parent);
+ dev_parent = sysfs_device_get_parent(udev, dev_parent);
}
return NULL;
}
-char *sysfs_attr_get_value(const char *devpath, const char *attr_name)
+char *sysfs_attr_get_value(struct udev *udev, const char *devpath, const char *attr_name)
{
char path_full[PATH_SIZE];
const char *path;
@@ -335,8 +325,8 @@ char *sysfs_attr_get_value(const char *devpath, const char *attr_name)
ssize_t size;
size_t sysfs_len;
- dbg("open '%s'/'%s'\n", devpath, attr_name);
- sysfs_len = strlcpy(path_full, sysfs_path, sizeof(path_full));
+ dbg(udev, "open '%s'/'%s'\n", devpath, attr_name);
+ sysfs_len = strlcpy(path_full, udev_get_sys_path(udev), sizeof(path_full));
if(sysfs_len >= sizeof(path_full))
sysfs_len = sizeof(path_full) - 1;
path = &path_full[sysfs_len];
@@ -347,23 +337,23 @@ char *sysfs_attr_get_value(const char *devpath, const char *attr_name)
/* look for attribute in cache */
list_for_each_entry(attr_loop, &attr_list, node) {
if (strcmp(attr_loop->path, path) == 0) {
- dbg("found in cache '%s'\n", attr_loop->path);
+ dbg(udev, "found in cache '%s'\n", attr_loop->path);
return attr_loop->value;
}
}
/* store attribute in cache (also negatives are kept in cache) */
- dbg("new uncached attribute '%s'\n", path_full);
+ dbg(udev, "new uncached attribute '%s'\n", path_full);
attr = malloc(sizeof(struct sysfs_attr));
if (attr == NULL)
return NULL;
memset(attr, 0x00, sizeof(struct sysfs_attr));
strlcpy(attr->path, path, sizeof(attr->path));
- dbg("add to cache '%s'\n", path_full);
+ dbg(udev, "add to cache '%s'\n", path_full);
list_add(&attr->node, &attr_list);
if (lstat(path_full, &statbuf) != 0) {
- dbg("stat '%s' failed: %s\n", path_full, strerror(errno));
+ dbg(udev, "stat '%s' failed: %s\n", path_full, strerror(errno));
goto out;
}
@@ -378,7 +368,7 @@ char *sysfs_attr_get_value(const char *devpath, const char *attr_name)
link_target[len] = '\0';
pos = strrchr(link_target, '/');
if (pos != NULL) {
- dbg("cache '%s' with link value '%s'\n", path_full, value);
+ dbg(udev, "cache '%s' with link value '%s'\n", path_full, value);
strlcpy(attr->value_local, &pos[1], sizeof(attr->value_local));
attr->value = attr->value_local;
}
@@ -397,7 +387,7 @@ char *sysfs_attr_get_value(const char *devpath, const char *attr_name)
/* read attribute value */
fd = open(path_full, O_RDONLY);
if (fd < 0) {
- dbg("attribute '%s' can not be opened\n", path_full);
+ dbg(udev, "attribute '%s' can not be opened\n", path_full);
goto out;
}
size = read(fd, value, sizeof(value));
@@ -410,7 +400,7 @@ char *sysfs_attr_get_value(const char *devpath, const char *attr_name)
/* got a valid value, store and return it */
value[size] = '\0';
remove_trailing_chars(value, '\n');
- dbg("cache '%s' with attribute value '%s'\n", path_full, value);
+ dbg(udev, "cache '%s' with attribute value '%s'\n", path_full, value);
strlcpy(attr->value_local, value, sizeof(attr->value_local));
attr->value = attr->value_local;
@@ -418,14 +408,14 @@ out:
return attr->value;
}
-int sysfs_lookup_devpath_by_subsys_id(char *devpath_full, size_t len, const char *subsystem, const char *id)
+int sysfs_lookup_devpath_by_subsys_id(struct udev *udev, char *devpath_full, size_t len, const char *subsystem, const char *id)
{
size_t sysfs_len;
char path_full[PATH_SIZE];
char *path;
struct stat statbuf;
- sysfs_len = strlcpy(path_full, sysfs_path, sizeof(path_full));
+ sysfs_len = strlcpy(path_full, udev_get_sys_path(udev), sizeof(path_full));
path = &path_full[sysfs_len];
if (strcmp(subsystem, "subsystem") == 0) {
@@ -504,7 +494,7 @@ out:
return 0;
found:
if (S_ISLNK(statbuf.st_mode))
- sysfs_resolve_link(path, sizeof(path_full) - sysfs_len);
+ sysfs_resolve_link(udev, path, sizeof(path_full) - sysfs_len);
strlcpy(devpath_full, path, len);
return 1;
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-03 14:42:54 +0000