haiku/docs/user/storage/VolumeRoster.dox

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/*
* Copyright 2002-2013 Haiku Inc. All rights reserved.
* Distributed under the terms of the MIT License.
*
* Authors:
* Vincent Dominguez
* John Scipione, jscipione@gmail.com
* Ingo Weinhold, bonefish@users.sf.net
*
* Corresponds to:
* headers/os/storage/VolumeRoster.h hrev45306
* src/kits/storage/VolumeRoster.cpp hrev45306
*/
/*!
\file VolumeRoster.h
\ingroup storage
\ingroup libbe
\brief Provides the BVolumeRoster class.
*/
/*!
\class BVolumeRoster
\ingroup storage
\ingroup libbe
\brief Provides an interface for iterating through available volumes
and watching for mounting/unmounting.
This class wraps the next_dev() function for iterating through the
list of available volumes and watch_node()/stop_watching() for
watching volumes.
*/
/*!
\fn BVolumeRoster::BVolumeRoster()
\brief Creates a BVolumeRoster object. The object is ready to be used.
*/
/*!
\fn BVolumeRoster::~BVolumeRoster()
\brief Deletes the volume roster and frees all associated resources.
If a watch was activated (by StartWatching()), it is deactivated.
*/
/*!
\fn status_t BVolumeRoster::GetNextVolume(BVolume *volume)
\brief Fills out the passed in BVolume object with the next available
volume.
\param volume A pointer to a pre-allocated BVolume object to be
initialized to the next available volume.
\return A status code.
\retval B_OK Everything went fine.
\retval B_BAD_VALUE The last volume in the list was already returned.
*/
/*!
\fn void BVolumeRoster::Rewind()
\brief Rewinds the list of available volumes back to the first item.
The next call to GetNextVolume() will return the first available volume.
*/
/*!
\fn status_t BVolumeRoster::GetBootVolume(BVolume *volume)
\brief Fills out the passed in BVolume object with the boot volume.
Currently, this method looks for the volume that is mounted at "/boot".
The only way to fool the system into thinking that there is not a boot
volume is to rename "/boot" -- but, please refrain from doing this.
\param volume A pointer to a pre-allocated BVolume to be initialized to
refer to the boot volume.
\return A status code, \c B_OK if everything went fine or an error code
otherwise.
*/
/*!
\fn status_t BVolumeRoster::StartWatching(BMessenger messenger)
\brief Starts watching the available volumes for changes.
Notifications are sent to the specified target whenever a volume is
mounted or unmounted. The format of the notification messages is
described under watch_node(). Actually BVolumeRoster just provides a
more convenient interface for it.
If StartWatching() has been called before with another target and no
StopWatching() since, StopWatching() is called first, so that the former
target won't receive any notifications anymore.
When the object is destroyed all watching ends as well.
\param messenger The target which the notification messages are sent.
\return A status code.
\retval B_OK Everything went fine.
\retval B_BAD_VALUE The supplied BMessenger was invalid.
\retval B_NO_MEMORY There was insufficient memory to carry out this
operation.
\see watch_node()
*/
/*!
\fn void BVolumeRoster::StopWatching()
\brief Stops watching volumes initiated by StartWatching().
\see stop_watching()
*/
/*!
\fn BMessenger BVolumeRoster::Messenger() const
\brief Returns the messenger currently watching the volume list.
\return A messenger to the target currently watching the volume list, or
an invalid messenger if not watching.
*/