int exception_pop_handler(int code, ExceptionHandler handler) {
unsigned int state = safe_entry();
if (code > (int)(sizeof(exception_stacks) / sizeof(*exception_stacks))) {
e9printf("exception_add_handler: invalid code: %d\n", code);
kerror(-1, "invalid code");
safe_exit(state);
return -1;
}
for (LinkNode *node=exception_stacks[code].first; node; node=node->next) {
if (node->data == handler) {
klist_remove(exception_stacks+code, node);
exc_free_node(node);
safe_exit(state);
return 0; //success
}
}
e9printf("failed to find handler %x for %d\n", handler, code);
safe_exit(state);
return -1; //couldn't find handler
}
/*
* __device_release_driver() must be called with @dev lock held.
* When called for a USB interface, @dev->parent lock must be held as well.
*/
static void __device_release_driver(struct device *dev)
{
struct device_driver *drv;
drv = dev->driver;
if (drv) {
pm_runtime_get_sync(dev);
driver_sysfs_remove(dev);
if (dev->bus)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
BUS_NOTIFY_UNBIND_DRIVER,
dev);
pm_runtime_put_sync(dev);
if (dev->bus && dev->bus->remove)
dev->bus->remove(dev);
else if (drv->remove)
drv->remove(dev);
devres_release_all(dev);
dev->driver = NULL;
klist_remove(&dev->p->knode_driver);
if (dev->bus)
blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
BUS_NOTIFY_UNBOUND_DRIVER,
dev);
}
}
int close(int fd) {
FSFile *file = (FSFile*)fd;
if (!_valid_file(fd))
return -1;
//do reference counting
file->refs--;
if (file->refs > 0) {
return 0;
}
file->closed = 1;
if (file->fs->close) {
_lock_file(file);
file->fs->close(file->fs, file->device, file->internalfd);
_unlock_file(file);
}
file->magic = 0;
Process *p = process_get_current(0);
LinkNode *node;
for (node=p->open_files.first; node; node=node->next) {
if (node->data == file) {
klist_remove(&p->open_files, node);
kfree(node);
break;
}
}
return 0;
}
/**
* bus_remove_device - remove device from bus
* @dev: device to be removed
*
* - Remove symlink from bus's directory.
* - Delete device from bus's list.
* - Detach from its driver.
* - Drop reference taken in bus_add_device().
*/
void bus_remove_device(struct device * dev)
{
if (dev->bus) {
sysfs_remove_link(&dev->kobj, "bus");
sysfs_remove_link(&dev->bus->devices.kobj, dev->bus_id);
device_remove_attrs(dev->bus, dev);
klist_remove(&dev->knode_bus);
pr_debug("bus %s: remove device %s\n", dev->bus->name, dev->bus_id);
device_release_driver(dev);
put_bus(dev->bus);
}
}
void bus_remove_driver(struct device_driver * drv)
{
if (drv->bus) {
remove_bind_files(drv);
driver_remove_attrs(drv->bus, drv);
klist_remove(&drv->knode_bus);
pr_debug("bus %s: remove driver %s\n", drv->bus->name, drv->name);
driver_detach(drv);
module_remove_driver(drv);
kobject_unregister(&drv->kobj);
put_bus(drv->bus);
}
}
/**
* bus_remove_driver - delete driver from bus's knowledge.
* @drv: driver.
*
* Detach the driver from the devices it controls, and remove
* it from its bus's list of drivers. Finally, we drop the reference
* to the bus we took in bus_add_driver().
*/
void bus_remove_driver(struct device_driver *drv)
{
if (!drv->bus)
return;
remove_bind_files(drv);
driver_remove_attrs(drv->bus, drv);
driver_remove_file(drv, &driver_attr_uevent);
klist_remove(&drv->p->knode_bus);
pr_debug("bus: '%s': remove driver %s\n", drv->bus->name, drv->name);
driver_detach(drv);
module_remove_driver(drv);
kobject_put(&drv->p->kobj);
bus_put(drv->bus);
}
/*
* __device_release_driver() must be called with @dev->sem held.
* When called for a USB interface, @dev->parent->sem must be held as well.
*/
static void __device_release_driver(struct device * dev)
{
struct device_driver * drv;
drv = get_driver(dev->driver);
if (drv) {
driver_sysfs_remove(dev);
sysfs_remove_link(&dev->kobj, "driver");
klist_remove(&dev->knode_driver);
if (dev->bus)
blocking_notifier_call_chain(&dev->bus->bus_notifier,
BUS_NOTIFY_UNBIND_DRIVER,
dev);
if (dev->bus && dev->bus->remove)
dev->bus->remove(dev);
else if (drv->remove)
drv->remove(dev);
devres_release_all(dev);
dev->driver = NULL;
put_driver(drv);
}
}