#include "libudev-private.h"
#include "../udev.h"
-ssize_t util_get_sys_subsystem(struct udev *udev, const char *devpath, char *subsystem, size_t size)
+static ssize_t get_sys_link(struct udev *udev, const char *slink, const char *devpath, char *subsystem, size_t size)
{
char path[PATH_SIZE];
ssize_t len;
strlcpy(path, udev_get_sys_path(udev), sizeof(path));
strlcat(path, devpath, sizeof(path));
- strlcat(path, "/subsystem", sizeof(path));
+ strlcat(path, "/", sizeof(path));
+ strlcat(path, slink, sizeof(path));
len = readlink(path, path, sizeof(path));
if (len < 0 || len >= (ssize_t) sizeof(path))
return -1;
pos = &pos[1];
return strlcpy(subsystem, pos, size);
}
+
+ssize_t util_get_sys_subsystem(struct udev *udev, const char *devpath, char *subsystem, size_t size)
+{
+ return get_sys_link(udev, "subsystem", devpath, subsystem, size);
+}
+
+ssize_t util_get_sys_driver(struct udev *udev, const char *devpath, char *driver, size_t size)
+{
+ return get_sys_link(udev, "driver", devpath, driver, size);
+}
+
+int util_resolve_sys_link(struct udev *udev, char *devpath, size_t size)
+{
+ char link_path[PATH_SIZE];
+ char link_target[PATH_SIZE];
+ int len;
+ int i;
+ int back;
+
+ 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(udev, "path link '%s' points to '%s'\n", devpath, link_target);
+
+ for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; 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, '/');
+
+ if (pos == NULL)
+ return -1;
+ pos[0] = '\0';
+ }
+ dbg(udev, "after moving back '%s'\n", devpath);
+ strlcat(devpath, "/", size);
+ strlcat(devpath, &link_target[back * 3], size);
+ return 0;
+}