void br_shutdown(void)
{
sysfs_close_class(br_class_net);
br_class_net = NULL;
close(br_socket_fd);
br_socket_fd = -1;
}
int br_refresh(void)
{
if (br_class_net) {
sysfs_close_class(br_class_net);
br_class_net = sysfs_open_class("net");
}
return 0;
}
/**
* 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 *c, classpath[SYSFS_PATH_MAX];
if (!name) {
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;
}
safestrcat(classpath, "/");
if (strcmp(name, SYSFS_BLOCK_NAME) == 0) {
safestrcat(classpath, SYSFS_BLOCK_NAME);
if (!sysfs_path_is_dir(classpath))
goto done;
c = strrchr(classpath, '/');
*(c+1) = '\0';
}
safestrcat(classpath, SYSFS_CLASS_NAME);
safestrcat(classpath, "/");
safestrcat(classpath, name);
done:
if (sysfs_path_is_dir(classpath)) {
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;
}