Remove shutdown

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How to Remove or Show the Start Menu Shutdown Options in Vista​ Information This will show you how to remove or show the Shut Down, Restart, Sleep, and Hibernate options from the Start menu and the red power button in the Windows Security screen when you press Ctrl+Alt+Delete. Note EXAMPLE: Start Menu Shutdown Options Before and After​​EXAMPLE: Ctrl+Alt+Del Shutdown Options Before and AfterNOTE: Notice the red shutdown options box is gone when this is enabled.​​ METHOD ONE Through the Local Group Policy EditorNOTE: This method is only available for the Vista Business, Ultimate, and Enterprise editions. See Method Two below for the Vista Home Basic and Home Premium editions.​2. In the left pane, click on User Configuration, Administrative Templates, and Start Menu and Taskbar. (See screenshot below)​​​3. In the right pane, right click on Remove and prevent access to the Shutdown, Restart,Sleep, and Hibernate commands and click on Properties. (See screenshot above)​​4. To Show Shutdown Options​​A) Select (dot) Disabled or Not Configured and click on OK. (See screenshot below step 5A)​​B) Go to step 6.​5. To Remove Shutdown Options​​A) Select (dot) Enabled and click on OK.​NOTE: You can still access the Restart, Sleep, and Shutdown options when you click on Switch User or Log Off from the Start menu. They will be in the red power button options in the bottom right corner of the logon screen.​​​6. Close the Local Group Policy Editor window. Your done.​​ METHOD TWO Using a REG File DownloadNOTE: This method will work for all Vista

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驱动中remove和shutdown根本的区别在于调用的时机不同，我们以platform驱动为例，如下：static struct platform_driver s3cmci_driver = { .driver = {}, .remove = __devexit_p(s3cmci_remove), .shutdown = s3cmci_shutdown,};static int __init s3cmci_init(void){ return platform_driver_register(&s3cmci_driver);}int platform_driver_register(struct platform_driver *drv){ if (drv->remove) drv->driver.remove = platform_drv_remove; if (drv->shutdown) drv->driver.shutdown = platform_drv_shutdown; return driver_register(&drv->driver);}14、15行，drv->remove是一个特定(具体)platform驱动的remove回调，比如这里的s3cmci_remove函数。drv->driver.remove是platform框架提供的，所有platform驱动通用。那么，一个特定驱动的remove函数如何得到调用？答案在platform_drv_remove函数中：static int platform_drv_remove(struct device *_dev){ struct platform_driver *drv = to_platform_driver(_dev->driver); struct platform_device *dev = to_platform_device(_dev); return drv->remove(dev);}platform_drv_remove相当于一个桥梁，实际干事的还是s3cmci_remove函数。16、17行的shutdown同理。至此，我们知道往后只需关注drv->driver.remove和drv->driver.shutdown就可以了。remove/shutdown回调时机：(1)卸载驱动的时候，remove调用(2)设备移除的时候，与设备关联的驱动需要移除，remove调用(3)系统关机/重启的时候，shutdown调用驱动卸载：void platform_driver_unregister(struct platform_driver *drv)-->driver_unregister(&drv->driver)---->bus_remove_driver(drv)------>driver_detach(drv){ struct device_private *dev_prv; struct device *dev; for (;;) { spin_lock(&drv->p->klist_devices.k_lock); if (list_empty(&drv->p->klist_devices.k_list)) { spin_unlock(&drv->p->klist_devices.k_lock); break; } dev_prv = list_entry(drv->p->klist_devices.k_list.prev, struct device_private, knode_driver.n_node); dev = dev_prv->device; get_device(dev); spin_unlock(&drv->p->klist_devices.k_lock); if (dev->parent) /* Needed for USB */ device_lock(dev->parent); device_lock(dev); if (dev->driver == drv) __device_release_driver(dev); device_unlock(dev); if (dev->parent) device_unlock(dev->parent); put_device(dev);}-------->void __device_release_driver(struct device *dev){ struct device_driver *drv; drv = dev->driver; if (drv) { pm_runtime_get_noresume(dev); pm_runtime_barrier(dev); driver_sysfs_remove(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); pm_runtime_put_sync(dev); }}我们知道：一个设备只能绑定一个驱动，而同一个驱动可以适用于多个设备(不用想就知道为什么)。所以第9行开始的for死循环就是遍历挂在driver上的device链表，直到链表为空，遍历完成退出for循环；否则，如果device的驱动是当前要卸载的驱动(dev->driver == drv)，就调用__device_release_driver进行进一步操作。在__device_release_driver函数中，pm_runtime_xxx之类的函数防止卸载过程中系统休眠，41行移除driver呈现在sys文件系统下的文件，44、45调用bus上的remove函数，而我们的主角-remove就在46、47行调用，进而执行s3cmci_remove函数。现在，device没有驱动了，所以设置device的driver成员为NULL：dev->driver = NULL设备移除：void platform_device_del(struct platform_device *pdev)-->device_del(&pdev->dev)---->bus_remove_device(dev){ if (dev->bus) { sysfs_remove_link(&dev->kobj, "subsystem"); sysfs_remove_link(&dev->bus->p->devices_kset->kobj, dev_name(dev)); device_remove_attrs(dev->bus, dev); if (klist_node_attached(&dev->p->knode_bus)) klist_del(&dev->p->knode_bus); pr_debug("bus: '%s': remove device %s\n", dev->bus->name, dev_name(dev)); device_release_driver(dev); bus_put(dev->bus); }}------>device_release_driver(dev){ /* * If anyone calls device_release_driver() recursively from * within their ->remove callback for the same device, they * will deadlock right here. */ device_lock(dev); __device_release_driver(dev); device_unlock(dev);}-------->__device_release_driver(dev)第5行,翻译过来就是：移除bus上的设备。整个bus_remove_device函数也非常简单，删除sys文件系统与该设备相关的文件(链接)、删除设备的属性文件、完了通过bus_put减少device的引用计数(Decrement the refcount)，当其引用计数为0的时候，才会彻底清楚该device及其占用的资源。系统关机/重启流程：void device_shutdown(void){ struct device *dev; spin_lock(&devices_kset->list_lock); /* * Walk the devices list backward, shutting down each in turn. * Beware that device unplug events may also start pulling * devices offline, even as the system is shutting down. */ while (!list_empty(&devices_kset->list)) { dev = list_entry(devices_kset->list.prev, struct device, kobj.entry); get_device(dev); /* * Make sure the device is off the kset list, in the * event that dev->*->shutdown() doesn't remove it. */ list_del_init(&dev->kobj.entry); spin_unlock(&devices_kset->list_lock); if (dev->bus && dev->bus->shutdown) { dev_dbg(dev, "shutdown\n"); dev->bus->shutdown(dev); } else if (dev->driver && dev->driver->shutdown) { dev_dbg(dev, "shutdown\n"); dev->driver->shutdown(dev); } put_device(dev); spin_lock(&devices_kset->list_lock); } spin_unlock(&devices_kset->list_lock);}void kernel_restart_prepare(char *cmd){ blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd); system_state = SYSTEM_RESTART; device_shutdown(); sysdev_shutdown();}static void kernel_shutdown_prepare(enum system_states state){ blocking_notifier_call_chain(&reboot_notifier_list, (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL); system_state = state; device_shutdown();}这几个函数实现都简明易懂，再加上注释更加不在话下，25~28行调用shutdown函数s3cmci_shutdown。这地方简单是因为有之前的基础，所以说：提纲契领，举一反三。