1/*
2 * Copyright (c) 1998-2016 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
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27 */
28/*
29 * Copyright (c) 1998 Apple Computer, Inc. All rights reserved.
30 *
31 * HISTORY
32 *
33 */
34
35
36#ifndef _IOKIT_IOREGISTRYENTRY_H
37#define _IOKIT_IOREGISTRYENTRY_H
38
39#include <IOKit/IOTypes.h>
40#include <libkern/c++/OSContainers.h>
41
42
43extern const OSSymbol * gIONameKey;
44extern const OSSymbol * gIOLocationKey;
45extern const OSSymbol * gIORegistryEntryIDKey;
46extern const OSSymbol * gIORegistryEntryPropertyKeysKey;
47
48class IORegistryEntry;
49class IORegistryPlane;
50class IORegistryIterator;
51
52typedef void (*IORegistryEntryApplierFunction)(IORegistryEntry * entry,
53 void * context);
54
55enum {
56 kIORegistryIterateRecursively = 0x00000001,
57 kIORegistryIterateParents = 0x00000002,
58};
59
60#ifdef KERNEL_PRIVATE
61enum
62{
63 kIORegistryEntryIndexedPropertyCLPC = 0,
64 kIORegistryEntryIndexedPropertyCount,
65};
66#endif /* KERNEL_PRIVATE */
67
68/*! @class IORegistryEntry : public OSObject
69 @abstract The base class for all objects in the registry.
70 @discussion The IORegistryEntry base class provides functions for describing graphs of connected registry entries, each with a dictionary-based property table. Entries may be connected in different planes, with differing topologies. Access to the registry is protected against multiple threads. Inside the kernel planes are specified with plane objects and are published by the creator - IOService exports the gIOServicePlane plane object for example. Non kernel clients specify planes by their name.
71*/
72
73class IORegistryEntry : public OSObject
74{
75 friend class IORegistryIterator;
76
77 OSDeclareDefaultStructors(IORegistryEntry)
78
79protected:
80/*! @struct ExpansionData
81 @discussion This structure will be used to expand the capablilties of this class in the future.
82 */
83 struct ExpansionData;
84
85/*! @var reserved
86 Reserved for future use. (Internal use only) */
87 ExpansionData * reserved;
88
89private:
90
91 OSDictionary * fRegistryTable;
92 OSDictionary * fPropertyTable;
93
94public:
95 /* methods available in Mac OS X 10.1 or later */
96
97/*! @function copyProperty
98 @abstract Synchronized method to obtain a property from a registry entry or one of its parents (or children) in the hierarchy. Available in Mac OS X 10.1 or later.
99 @discussion This method will search for a property, starting first with this registry entry's property table, then iterating recusively through either the parent registry entries or the child registry entries of this entry. Once the first occurrence is found, it will lookup and return the value of the property, using the OSDictionary::getObject semantics. The iteration keeps track of entries that have been recursed into previously to avoid loops. This method is synchronized with other IORegistryEntry accesses to the property table(s).
100 @param aKey The property's name as a C-string.
101 @param plane The plane to iterate over, eg. gIOServicePlane.
102 @param options kIORegistryIterateRecursively may be set to recurse automatically into the registry hierarchy. Without this option, this method degenerates into the standard getProperty() call. kIORegistryIterateParents may be set to iterate the parents of the entry, in place of the children.
103 @result The property value found, or zero. A reference on any found property is returned to caller, which should be released. */
104
105 virtual OSObject * copyProperty( const char * aKey,
106 const IORegistryPlane * plane,
107 IOOptionBits options =
108 kIORegistryIterateRecursively |
109 kIORegistryIterateParents) const;
110
111/*! @function copyProperty
112 @abstract Synchronized method to obtain a property from a registry entry or one of its parents (or children) in the hierarchy. Available in Mac OS X 10.1 or later.
113 @discussion This method will search for a property, starting first with this registry entry's property table, then iterating recusively through either the parent registry entries or the child registry entries of this entry. Once the first occurrence is found, it will lookup and return the value of the property, using the OSDictionary::getObject semantics. The iteration keeps track of entries that have been recursed into previously to avoid loops. This method is synchronized with other IORegistryEntry accesses to the property table(s).
114 @param aKey The property's name as an OSString.
115 @param plane The plane to iterate over, eg. gIOServicePlane.
116 @param options kIORegistryIterateRecursively may be set to recurse automatically into the registry hierarchy. Without this option, this method degenerates into the standard getProperty() call. kIORegistryIterateParents may be set to iterate the parents of the entry, in place of the children.
117 @result The property value found, or zero. A reference on any found property is returned to caller, which should be released. */
118
119 virtual OSObject * copyProperty( const OSString * aKey,
120 const IORegistryPlane * plane,
121 IOOptionBits options =
122 kIORegistryIterateRecursively |
123 kIORegistryIterateParents) const;
124
125/*! @function copyProperty
126 @abstract Synchronized method to obtain a property from a registry entry or one of its parents (or children) in the hierarchy. Available in Mac OS X 10.1 or later.
127 @discussion This method will search for a property, starting first with this registry entry's property table, then iterating recusively through either the parent registry entries or the child registry entries of this entry. Once the first occurrence is found, it will lookup and return the value of the property, using the OSDictionary::getObject semantics. The iteration keeps track of entries that have been recursed into previously to avoid loops. This method is synchronized with other IORegistryEntry accesses to the property table(s).
128 @param aKey The property's name as an OSSymbol.
129 @param plane The plane to iterate over, eg. gIOServicePlane.
130 @param options kIORegistryIterateRecursively may be set to recurse automatically into the registry hierarchy. Without this option, this method degenerates into the standard getProperty() call. kIORegistryIterateParents may be set to iterate the parents of the entry, in place of the children.
131 @result The property value found, or zero. A reference on any found property is returned to caller, which should be released. */
132
133 virtual OSObject * copyProperty( const OSSymbol * aKey,
134 const IORegistryPlane * plane,
135 IOOptionBits options =
136 kIORegistryIterateRecursively |
137 kIORegistryIterateParents) const;
138
139/*! @function copyParentEntry
140 @abstract Returns an registry entry's first parent entry in a plane. Available in Mac OS X 10.1 or later.
141 @discussion This function will return the parent to which a registry entry was first attached. Since the majority of registry entrys have only one provider, this is a useful simplification.
142 @param plane The plane object.
143 @result Returns the first parent of the registry entry, or zero if the entry is not attached into the registry in that plane. A reference on the entry is returned to caller, which should be released. */
144
145 virtual IORegistryEntry * copyParentEntry( const IORegistryPlane * plane ) const;
146
147/*! @function copyChildEntry
148 @abstract Returns an registry entry's first child entry in a plane. Available in Mac OS X 10.1 or later.
149 @discussion This function will return the child which first attached to a registry entry.
150 @param plane The plane object.
151 @result Returns the first child of the registry entry, or zero if the entry is not attached into the registry in that plane. A reference on the entry is returned to caller, which should be released. */
152
153 virtual IORegistryEntry * copyChildEntry( const IORegistryPlane * plane ) const;
154
155 /* method available in Mac OS X 10.4 or later */
156/*!
157 @typedef Action
158 @discussion Type and arguments of callout C function that is used when
159a runCommand is executed by a client. Cast to this type when you want a C++
160member function to be used. Note the arg1 - arg3 parameters are passed straight pass through to the action callout.
161 @param target
162 Target of the function, can be used as a refcon. Note if a C++ function
163was specified, this parameter is implicitly the first parameter in the target
164member function's parameter list.
165 @param arg0 Argument to action from run operation.
166 @param arg1 Argument to action from run operation.
167 @param arg2 Argument to action from run operation.
168 @param arg3 Argument to action from run operation.
169*/
170 typedef IOReturn (*Action)(OSObject *target,
171 void *arg0, void *arg1,
172 void *arg2, void *arg3);
173
174/*! @function runPropertyAction
175 @abstract Single thread a call to an action w.r.t. the property lock
176 @discussion Client function that causes the given action to be called in a manner that syncrhonises with the registry iterators and serialisers. This functin can be used to synchronously manipulate the property table of this nub
177 @param action Pointer to function to be executed in work-loop context.
178 @param arg0 Parameter for action parameter, defaults to 0.
179 @param arg1 Parameter for action parameter, defaults to 0.
180 @param arg2 Parameter for action parameter, defaults to 0.
181 @param arg3 Parameter for action parameter, defaults to 0.
182 @result Returns the value of the Action callout.
183*/
184 virtual IOReturn runPropertyAction(Action action, OSObject *target,
185 void *arg0 = 0, void *arg1 = 0,
186 void *arg2 = 0, void *arg3 = 0);
187
188private:
189#if __LP64__
190 OSMetaClassDeclareReservedUnused(IORegistryEntry, 0);
191 OSMetaClassDeclareReservedUnused(IORegistryEntry, 1);
192 OSMetaClassDeclareReservedUnused(IORegistryEntry, 2);
193 OSMetaClassDeclareReservedUnused(IORegistryEntry, 3);
194 OSMetaClassDeclareReservedUnused(IORegistryEntry, 4);
195 OSMetaClassDeclareReservedUnused(IORegistryEntry, 5);
196#else
197 OSMetaClassDeclareReservedUsed(IORegistryEntry, 0);
198 OSMetaClassDeclareReservedUsed(IORegistryEntry, 1);
199 OSMetaClassDeclareReservedUsed(IORegistryEntry, 2);
200 OSMetaClassDeclareReservedUsed(IORegistryEntry, 3);
201 OSMetaClassDeclareReservedUsed(IORegistryEntry, 4);
202 OSMetaClassDeclareReservedUsed(IORegistryEntry, 5);
203#endif
204 OSMetaClassDeclareReservedUnused(IORegistryEntry, 6);
205 OSMetaClassDeclareReservedUnused(IORegistryEntry, 7);
206 OSMetaClassDeclareReservedUnused(IORegistryEntry, 8);
207 OSMetaClassDeclareReservedUnused(IORegistryEntry, 9);
208 OSMetaClassDeclareReservedUnused(IORegistryEntry, 10);
209 OSMetaClassDeclareReservedUnused(IORegistryEntry, 11);
210 OSMetaClassDeclareReservedUnused(IORegistryEntry, 12);
211 OSMetaClassDeclareReservedUnused(IORegistryEntry, 13);
212 OSMetaClassDeclareReservedUnused(IORegistryEntry, 14);
213 OSMetaClassDeclareReservedUnused(IORegistryEntry, 15);
214 OSMetaClassDeclareReservedUnused(IORegistryEntry, 16);
215 OSMetaClassDeclareReservedUnused(IORegistryEntry, 17);
216 OSMetaClassDeclareReservedUnused(IORegistryEntry, 18);
217 OSMetaClassDeclareReservedUnused(IORegistryEntry, 19);
218 OSMetaClassDeclareReservedUnused(IORegistryEntry, 20);
219 OSMetaClassDeclareReservedUnused(IORegistryEntry, 21);
220 OSMetaClassDeclareReservedUnused(IORegistryEntry, 22);
221 OSMetaClassDeclareReservedUnused(IORegistryEntry, 23);
222 OSMetaClassDeclareReservedUnused(IORegistryEntry, 24);
223 OSMetaClassDeclareReservedUnused(IORegistryEntry, 25);
224 OSMetaClassDeclareReservedUnused(IORegistryEntry, 26);
225 OSMetaClassDeclareReservedUnused(IORegistryEntry, 27);
226 OSMetaClassDeclareReservedUnused(IORegistryEntry, 28);
227 OSMetaClassDeclareReservedUnused(IORegistryEntry, 29);
228 OSMetaClassDeclareReservedUnused(IORegistryEntry, 30);
229 OSMetaClassDeclareReservedUnused(IORegistryEntry, 31);
230
231public:
232
233 /* Registry accessors */
234
235/*! @function getRegistryRoot
236 @abstract Returns a pointer to the root instance of the registry.
237 @discussion This method provides an accessor to the root of the registry for the machine. The root may be passed to a registry iterator when iterating a plane, and contains properties that describe the available planes, and diagnostic information for IOKit. Keys for these properties are in IOKitKeys.h.
238 @result A pointer to the IORegistryEntry root instance. It should not be released by the caller. */
239
240 static IORegistryEntry * getRegistryRoot( void );
241
242/*! @function getGenerationCount
243 @abstract Returns an generation count for all registry changing operations.
244 @discussion This method provides an accessor to the current generation count (or seed) of the registry which changes when any topology change occurs in the registry - this does not include property table changes. It may be used to invalidate any caching of the results from IORegistryEntry methods.
245 @result An integer generation count. */
246
247 static SInt32 getGenerationCount( void );
248
249/*! @function getPlane
250 @abstract Looks up the plane object by a C-string name.
251 @discussion Planes are usually provided as globals by the creator, eg. gIOServicePlane, gIODeviceTreePlane, or gIOAudioPlane, however they may also be looked up by name with this method.
252 @result A pointer to the plane object, or zero if no such plane exists. The returned plane should not be released. */
253
254 static const IORegistryPlane * getPlane( const char * name );
255
256 /* Registry Entry allocation & init */
257
258/*! @function init
259 @abstract Standard init method for all IORegistryEntry subclasses.
260 @discussion A registry entry must be initialized with this method before it can be used. A property dictionary may passed and will be retained by this method for use as the registry entry's property table, or an empty one will be created.
261 @param dictionary A dictionary that will become the registry entry's property table (retaining it), or zero which will cause an empty property table to be created.
262 @result true on success, or false on a resource failure. */
263
264 virtual bool init( OSDictionary * dictionary = 0 );
265
266/*! @function free
267 @abstract Standard free method for all IORegistryEntry subclasses.
268 @discussion This method will release any resources of the entry, in particular its property table. Note that the registry entry must always be detached from the registry before free may be called, and subclasses (namely IOService) will have additional protocols for removing registry entries. free should never need be called directly. */
269
270 virtual void free( void ) APPLE_KEXT_OVERRIDE;
271
272/*! @function setPropertyTable
273 @abstract Replace a registry entry's property table.
274 @discussion This method will release the current property table of a the entry and replace it with another, retaining the new property table.
275 @param dict The new dictionary to be used as the entry's property table. */
276
277 virtual void setPropertyTable( OSDictionary * dict );
278
279 /* Synchronized property accessors; wrappers to OSDictionary
280 * plus property creation helpers */
281
282/*! @function setProperty
283 @abstract Synchronized method to add a property to a registry entry's property table.
284 @discussion This method will add or replace a property in a registry entry's property table, using the OSDictionary::setObject semantics. This method is synchronized with other IORegistryEntry accesses to the property table.
285 @param aKey The properties name as an OSSymbol.
286 @param anObject The property value.
287 @result true on success or false on a resource failure. */
288
289 virtual bool setProperty(const OSSymbol * aKey, OSObject * anObject);
290
291#ifdef KERNEL_PRIVATE
292 OSObject * setIndexedProperty(uint32_t index, OSObject * anObject);
293 OSObject * getIndexedProperty(uint32_t index) const;
294#endif /* KERNEL_PRIVATE */
295
296/*! @function setProperty
297 @abstract Synchronized method to add a property to a registry entry's property table.
298 @discussion This method will add or replace a property in a registry entry's property table, using the OSDictionary::setObject semantics. This method is synchronized with other IORegistryEntry accesses to the property table.
299 @param aKey The property's name as an OSString.
300 @param anObject The property value.
301 @result true on success or false on a resource failure. */
302
303 virtual bool setProperty(const OSString * aKey, OSObject * anObject);
304
305/*! @function setProperty
306 @abstract Synchronized method to add a property to a registry entry's property table.
307 @discussion This method will add or replace a property in a registry entry's property table, using the OSDictionary::setObject semantics. This method is synchronized with other IORegistryEntry accesses to the property table.
308 @param aKey The property's name as a C-string.
309 @param anObject The property value.
310 @result true on success or false on a resource failure. */
311
312 virtual bool setProperty(const char * aKey, OSObject * anObject);
313
314/*! @function setProperty
315 @abstract Synchronized method to construct and add a OSString property to a registry entry's property table.
316 @discussion This method will add or replace a property in a registry entry's property table, using the OSDictionary::setObject semantics. This method is synchronized with other IORegistryEntry accesses to the property table. The property is created as an OSString from the supplied C-string, set in the property table with the given name, and released.
317 @param aKey The property's name as a C-string.
318 @param aString The property value as a C-string.
319 @result true on success or false on a resource failure. */
320
321 virtual bool setProperty(const char * aKey, const char * aString);
322
323/*! @function setProperty
324 @abstract Synchronized method to construct and add an OSBoolean property to a registry entry's property table.
325 @discussion This method will add or replace a property in a registry entry's property table, using the OSDictionary::setObject semantics. This method is synchronized with other IORegistryEntry accesses to the property table. The property is created as an OSBoolean from the supplied value, set in the property table with the given name, and released.
326 @param aKey The property's name as a C-string.
327 @param aBoolean The property's boolean value.
328 @result true on success or false on a resource failure. */
329
330 virtual bool setProperty(const char * aKey, bool aBoolean);
331
332/*! @function setProperty
333 @abstract Synchronized method to construct and add an OSNumber property to a registry entry's property table.
334 @discussion This method will add or replace a property in a registry entry's property table, using the OSDictionary::setObject semantics. This method is synchronized with other IORegistryEntry accesses to the property table. The property is created as an OSNumber from the supplied value and size, set in the property table with the given name, and released.
335 @param aKey The property's name as a C-string.
336 @param aValue The property's numeric value.
337 @param aNumberOfBits The property's size in bits, for OSNumber.
338 @result true on success or false on a resource failure. */
339
340 virtual bool setProperty( const char * aKey,
341 unsigned long long aValue,
342 unsigned int aNumberOfBits);
343
344/*! @function setProperty
345 @abstract Synchronized method to construct and add an OSData property to a registry entry's property table.
346 @discussion This method will add or replace a property in a registry entry's property table, using the OSDictionary::setObject semantics. This method is synchronized with other IORegistryEntry accesses to the property table. The property is created as an OSData copied from the supplied data and length, set in the property table with the given name, and released.
347 @param aKey The property's name as a C-string.
348 @param bytes The property's value as a pointer. OSData will copy this data.
349 @param length The property's size in bytes, for OSData.
350 @result true on success or false on a resource failure. */
351
352 virtual bool setProperty( const char * aKey,
353 void * bytes,
354 unsigned int length);
355
356/*! @function removeProperty
357 @abstract Synchronized method to remove a property from a registry entry's property table.
358 @discussion This method will remove a property from a registry entry's property table, using the OSDictionary::removeObject semantics. This method is synchronized with other IORegistryEntry accesses to the property table.
359 @param aKey The property's name as an OSSymbol. */
360
361 virtual void removeProperty( const OSSymbol * aKey);
362
363/*! @function removeProperty
364 @abstract Synchronized method to remove a property from a registry entry's property table.
365 @discussion This method will remove a property from a registry entry's property table, using the OSDictionary::removeObject semantics. This method is synchronized with other IORegistryEntry accesses to the property table.
366 @param aKey The property's name as an OSString. */
367
368 virtual void removeProperty( const OSString * aKey);
369
370/*! @function removeProperty
371 @abstract Synchronized method to remove a property from a registry entry's property table.
372 @discussion This method will remove a property from a registry entry's property table, using the OSDictionary::removeObject semantics. This method is synchronized with other IORegistryEntry accesses to the property table.
373 @param aKey The property's name as a C-string. */
374
375 virtual void removeProperty( const char * aKey);
376
377/*! @function getProperty
378 @abstract Synchronized method to obtain a property from a registry entry's property table.
379 @discussion This method will lookup a property in a registry entry's property table, using the OSDictionary::getObject semantics. This method is synchronized with other IORegistryEntry accesses to the property table.
380 @param aKey The property's name as an OSSymbol.
381 @result The property value found, or zero. */
382
383 virtual OSObject * getProperty( const OSSymbol * aKey) const;
384
385/*! @function getProperty
386 @abstract Synchronized method to obtain a property from a registry entry's property table.
387 @discussion This method will lookup a property in a registry entry's property table, using the OSDictionary::getObject semantics. This method is synchronized with other IORegistryEntry accesses to the property table.
388 @param aKey The property's name as an OSString.
389 @result The property value found, or zero. */
390
391 virtual OSObject * getProperty( const OSString * aKey) const;
392
393/*! @function getProperty
394 @abstract Synchronized method to obtain a property from a registry entry's property table.
395 @discussion This method will lookup a property in a registry entry's property table, using the OSDictionary::getObject semantics. This method is synchronized with other IORegistryEntry accesses to the property table.
396 @param aKey The property's name as a C-string.
397 @result The property value found, or zero. */
398
399 virtual OSObject * getProperty( const char * aKey) const;
400
401/*! @function getProperty
402 @abstract Synchronized method to obtain a property from a registry entry or one of its parents (or children) in the hierarchy.
403 @discussion This method will search for a property, starting first with this registry entry's property table, then iterating recusively through either the parent registry entries or the child registry entries of this entry. Once the first occurrence is found, it will lookup and return the value of the property, using the OSDictionary::getObject semantics. The iteration keeps track of entries that have been recursed into previously to avoid loops. This method is synchronized with other IORegistryEntry accesses to the property table(s).
404 @param aKey The property's name as an OSSymbol.
405 @param plane The plane to iterate over, eg. gIOServicePlane.
406 @param options kIORegistryIterateRecursively may be set to recurse automatically into the registry hierarchy. Without this option, this method degenerates into the standard getProperty() call. kIORegistryIterateParents may be set to iterate the parents of the entry, in place of the children.
407 @result The property value found, or zero. */
408
409 virtual OSObject * getProperty( const OSSymbol * aKey,
410 const IORegistryPlane * plane,
411 IOOptionBits options =
412 kIORegistryIterateRecursively |
413 kIORegistryIterateParents) const;
414
415/*! @function getProperty
416 @abstract Synchronized method to obtain a property from a registry entry or one of its parents (or children) in the hierarchy.
417 @discussion This method will search for a property, starting first with this registry entry's property table, then iterating recusively through either the parent registry entries or the child registry entries of this entry. Once the first occurrence is found, it will lookup and return the value of the property, using the OSDictionary::getObject semantics. The iteration keeps track of entries that have been recursed into previously to avoid loops. This method is synchronized with other IORegistryEntry accesses to the property table(s).
418 @param aKey The property's name as an OSString.
419 @param plane The plane to iterate over, eg. gIOServicePlane.
420 @param options kIORegistryIterateRecursively may be set to recurse automatically into the registry hierarchy. Without this option, this method degenerates into the standard getProperty() call. kIORegistryIterateParents may be set to iterate the parents of the entry, in place of the children.
421 @result The property value found, or zero. */
422
423 virtual OSObject * getProperty( const OSString * aKey,
424 const IORegistryPlane * plane,
425 IOOptionBits options =
426 kIORegistryIterateRecursively |
427 kIORegistryIterateParents) const;
428
429/*! @function getProperty
430 @abstract Synchronized method to obtain a property from a registry entry or one of its parents (or children) in the hierarchy.
431 @discussion This method will search for a property, starting first with this registry entry's property table, then iterating recusively through either the parent registry entries or the child registry entries of this entry. Once the first occurrence is found, it will lookup and return the value of the property, using the OSDictionary::getObject semantics. The iteration keeps track of entries that have been recursed into previously to avoid loops. This method is synchronized with other IORegistryEntry accesses to the property table(s).
432 @param aKey The property's name as a C-string.
433 @param plane The plane to iterate over, eg. gIOServicePlane.
434 @param options kIORegistryIterateRecursively may be set to recurse automatically into the registry hierarchy. Without this option, this method degenerates into the standard getProperty() call. kIORegistryIterateParents may be set to iterate the parents of the entry, in place of the children.
435 @result The property value found, or zero. */
436
437 virtual OSObject * getProperty( const char * aKey,
438 const IORegistryPlane * plane,
439 IOOptionBits options =
440 kIORegistryIterateRecursively |
441 kIORegistryIterateParents) const;
442
443/*! @function copyProperty
444 @abstract Synchronized method to obtain a property from a registry entry's property table.
445 @discussion This method will lookup a property in a registry entry's property table, using the OSDictionary::getObject semantics, and return a reference to the caller. This method is synchronized with other IORegistryEntry accesses to the property table.
446 @param aKey The property's name as an OSSymbol.
447 @result The property value found, or zero. It should be released by the caller. */
448
449 virtual OSObject * copyProperty( const OSSymbol * aKey) const;
450
451/*! @function copyProperty
452 @abstract Synchronized method to obtain a property from a registry entry's property table.
453 @discussion This method will lookup a property in a registry entry's property table, using the OSDictionary::getObject semantics, and return a reference to the caller. This method is synchronized with other IORegistryEntry accesses to the property table.
454 @param aKey The property's name as an OSString.
455 @result The property value found, or zero. It should be released by the caller. */
456
457 virtual OSObject * copyProperty( const OSString * aKey) const;
458
459/*! @function copyProperty
460 @abstract Synchronized method to obtain a property from a registry entry's property table.
461 @discussion This method will lookup a property in a registry entry's property table, using the OSDictionary::getObject semantics, and return a reference to the caller. This method is synchronized with other IORegistryEntry accesses to the property table.
462 @param aKey The property's name as a C-string.
463 @result The property value found, or zero. It should be released by the caller. */
464
465 virtual OSObject * copyProperty( const char * aKey) const;
466
467/*! @function dictionaryWithProperties
468 @abstract Synchronized method to obtain copy a registry entry's property table.
469 @discussion This method will copy a registry entry's property table, using the OSDictionary::withDictionary semantics. This method is synchronized with other IORegistryEntry accesses to the property table. Since OSDictionary will only copy property values by reference, synchronization is not guaranteed to any collection values.
470 @result The created dictionary, or zero on a resource value. It should be released by the caller. */
471
472 virtual OSDictionary * dictionaryWithProperties( void ) const;
473
474/*! @function serializeProperties
475 @abstract Synchronized method to serialize a registry entry's property table.
476 @discussion This method will serialize a registry entry's property table, using the OSDictionary::serialize semantics. This method is synchronized with other IORegistryEntry accesses to the property table. Many non-kernel clients of IOKit read information from the registry via properties, and will invoke this method in a registry entry to create a serialization of all the entry's properties, which is then reconstructed in the client's task as a CFDictionary. This method may be intercepted by subclasses to update their properties or implement a different serialization method, though it is usually better to implement such functionality by creating objects in the property table and implementing their serialize methods, avoiding any need to implement serializeProperties.
477 @param serialize The OSSerialize instance representing the serialization request.
478 @result True on success, false otherwise. */
479
480 virtual bool serializeProperties( OSSerialize * serialize ) const;
481
482 /* Unsynchronized(!) property table access */
483
484/*! @function getPropertyTable
485 @abstract Unsynchronized accessor to a registry entry's property table.
486 @discussion This method will return a pointer to the live property table as an OSDictionery. Its use is not recommended in most cases, instead use the synchronized accessors and helper functions of IORegistryEntry to access properties. It can only safely be used by one thread, which usually means it can only be used before a registry entry is entered into the registry.
487 @result A pointer to the property table as an OSDictionary. The pointer is valid while the registry entry is retained, and should not be released by the caller. */
488
489 /* inline */ OSDictionary * getPropertyTable( void ) const;
490 /* { return(fPropertyTable); } */
491
492 /* Set properties from user level, to be overridden if supported */
493
494/*! @function setProperties
495 @abstract Optionally supported external method to set properties in a registry entry.
496 @discussion This method is not implemented by IORegistryEntry, but is available to kernel and non-kernel clients to set properties in a registry entry. IOUserClient provides connection based, more controlled access to this functionality and may be more appropriate for many uses, since there is no differentiation between clients available to this method.
497 @param properties Any OSObject subclass, to be interpreted by the implementing method - for example an OSDictionary, OSData etc. may all be appropriate.
498 @result An IOReturn code to be returned to the caller. */
499
500 virtual IOReturn setProperties( OSObject * properties );
501
502 /* Topology */
503
504/*! @function getParentIterator
505 @abstract Returns an iterator over an registry entry's parent entries in a specified plane.
506 @param plane The plane object.
507 @result Returns an iterator over the parents of the registry entry, or zero if there is a resource failure. The iterator must be released when the iteration is finished. All objects returned by the iteration are retained while the iterator is valid, though they may no longer be attached during the iteration. */
508
509 virtual OSIterator * getParentIterator( const IORegistryPlane * plane )
510 const;
511 virtual void applyToParents( IORegistryEntryApplierFunction applier,
512 void * context,
513 const IORegistryPlane * plane ) const;
514
515/*! @function getParentEntry
516 @abstract Returns an registry entry's first parent entry in a plane.
517 @discussion This function will return the parent to which a registry entry was first attached. Since the majority of registry entrys have only one provider, this is a useful simplification.
518 @param plane The plane object.
519 @result Returns the first parent of the registry entry, or zero if the entry is not attached into the registry in that plane. The parent is retained while the entry is attached, and should not be released by the caller. */
520
521 virtual IORegistryEntry * getParentEntry( const IORegistryPlane * plane ) const;
522
523/*! @function getChildIterator
524 @abstract Returns an iterator over an registry entry's child entries in a plane.
525 @discussion This method creates an iterator which will return each of a registry entry's child entries in a specified plane.
526 @param plane The plane object.
527 @result Returns an iterator over the children of the entry, or zero if there is a resource failure. The iterator must be released when the iteration is finished. All objects returned by the iteration are retained while the iterator is valid, though they may no longer be attached during the iteration. */
528
529 virtual OSIterator * getChildIterator( const IORegistryPlane * plane )
530 const;
531
532#if XNU_KERNEL_PRIVATE
533 uint32_t getChildCount( const IORegistryPlane * plane ) const;
534 OSArray * copyPropertyKeys(void) const;
535#endif
536
537 virtual void applyToChildren( IORegistryEntryApplierFunction applier,
538 void * context,
539 const IORegistryPlane * plane ) const;
540
541/*! @function getChildEntry
542 @abstract Returns an registry entry's first child entry in a plane.
543 @discussion This function will return the child which first attached to a registry entry.
544 @param plane The plane object.
545 @result Returns the first child of the registry entry, or zero if the entry is not attached into the registry in that plane. The child is retained while the entry is attached, and should not be released by the caller. */
546
547 virtual IORegistryEntry * getChildEntry( const IORegistryPlane * plane ) const;
548
549/*! @function isChild
550 @abstract Determines whether a registry entry is the child of another in a plane.
551 @discussion This method called in the parent entry determines if the specified entry is a child, in a plane. Additionally, it can check if the child is the only child of the parent entry.
552 @param child The possible child registry entry.
553 @param plane The plane object.
554 @param onlyChild If true, check also if the child is the only child.
555 @result If the child argument is not a child of the registry entry, false is returned. If onlyChild is true and the child is not the only child of the entry, false is returned, otherwise true is returned. */
556
557 virtual bool isChild( IORegistryEntry * child,
558 const IORegistryPlane * plane,
559 bool onlyChild = false ) const;
560
561/*! @function isParent
562 @abstract Determines whether a registry entry is the parent of another in a plane.
563 @discussion This method called in the child entry determines if the specified entry is a parent, in a plane. Additionally, it can check if the parent is the only parent of the child entry.
564 @param parent The possible parent registry entry.
565 @param plane The plane object.
566 @param onlyParent If true, check also if the parent is the only parent.
567 @result If the parent argument is not a parent of the registry entry, false is returned. If onlyParent is true and the parent is not the only parent of the entry, false is returned, otherwise true is returned. */
568
569 virtual bool isParent( IORegistryEntry * parent,
570 const IORegistryPlane * plane,
571 bool onlyParent = false ) const;
572
573/*! @function inPlane
574 @abstract Determines whether a registry entry is attached in a plane.
575 @discussion This method determines if the entry is attached in a plane to any other entry. It can also be used to determine if the entry is a member of any plane.
576 @param plane The plane object, 0 indicates any plane.
577 @result If the entry has a parent in the given plane or if plane = 0 then if entry has any parent; return true, otherwise false. */
578
579 virtual bool inPlane( const IORegistryPlane * plane = 0) const;
580
581/*! @function getDepth
582 @abstract Counts the maximum number of entries between an entry and the registry root, in a plane.
583 @discussion This method counts the number of entries between and entry and the registry root, in a plane, for each parent of the entry and returns the maximum value.
584 @param plane The plane object.
585 @result The maximum number of entries between the entry and the root. Zero is returned if the entry is not attached in the plane. */
586
587 virtual unsigned int getDepth( const IORegistryPlane * plane ) const;
588
589 /* Attach / detach */
590
591/*! @function attachToParent
592 @abstract Attaches a entry to a parent entry in a plane.
593 @discussion This is the usual method of entering an entry into the registry. It is a no-op and success if the entry is already attached to the parent. Attaching the entry into the registry retains both the child and parent while they are attached. This method will call attachToChild in the parent entry if it is not being called from attachToChild.
594 @param parent The registry entry to attach to.
595 @param plane The plane object.
596 @result true on success, or false on a resource failure, or if the parent is the same as the child. */
597
598 virtual bool attachToParent( IORegistryEntry * parent,
599 const IORegistryPlane * plane );
600
601/*! @function detachFromParent
602 @abstract Detaches an entry from a parent entry in a plane.
603 @discussion This is the usual method of removing an entry from the registry. It is a no-op if the entry is not attached to the parent. Detaching the entry will release both the child and parent. This method will call detachFromChild in the parent entry if it is not being called from detachFromChild.
604 @param parent The registry entry to detach from.
605 @param plane The plane object. */
606
607 virtual void detachFromParent( IORegistryEntry * parent,
608 const IORegistryPlane * plane );
609
610/*! @function attachToChild
611 @abstract Method called in the parent entry when a child attaches.
612 @discussion This method is called in the parent entry when a child attaches, to make overrides possible. This method will also call attachToParent in the child entry if it is not being called from attachToParent. It is a no-op and success if the entry is already a child. Attaching the entry into the registry retains both the child and parent while they are attached.
613 @param child The registry entry being attached.
614 @param plane The plane object.
615 @result true on success, or false on a resource failure, or if the parent is the same as the child. */
616
617 virtual bool attachToChild( IORegistryEntry * child,
618 const IORegistryPlane * plane );
619
620/*! @function detachFromChild
621 @abstract Detaches a child entry from its parent in a plane.
622 @discussion This method is called in the parent entry when a child detaches, to make overrides possible. It is a no-op if the entry is not a child of the parent. Detaching the entry will release both the child and parent. This method will call detachFromParent in the child entry if it is not being called from detachFromParent.
623 @param child The registry entry to detach.
624 @param plane The plane object. */
625
626 virtual void detachFromChild( IORegistryEntry * child,
627 const IORegistryPlane * plane );
628
629/*! @function detachAbove
630 @abstract Detaches an entry from all its parent entries in a plane.
631 @discussion This method calls detachFromParent in the entry for each of its parent entries in the plane.
632 @param plane The plane object. */
633
634 virtual void detachAbove( const IORegistryPlane * plane );
635
636/*! @function detachAll
637 @abstract Detaches an entry and all its children recursively in a plane.
638 @discussion This method breaks the registry connections for a subtree. detachAbove is called in the entry, and all child entries and their children in the plane.
639 @param plane The plane object. */
640
641 virtual void detachAll( const IORegistryPlane * plane );
642
643 /* Name, location and path accessors */
644
645/*! @function getName
646 @abstract Returns the name assigned to the registry entry as a C-string.
647 @discussion Entries can be named in a particular plane, or globally. If the entry is named in plane and the plane is specified that name will be returned, otherwise the global name is returned. The global name defaults to the entry's meta class name if it has not been named.
648 @param plane The plane object, or zero for the global name.
649 @result A C-string name, valid while the entry is retained. */
650
651 virtual const char * getName( const IORegistryPlane * plane = 0 ) const;
652
653/*! @function copyName
654 @abstract Returns the name assigned to the registry entry as an OSSymbol.
655 @discussion Entries can be named in a particular plane, or globally. If the entry is named in plane and the plane is specified that name will be returned, otherwise the global name is returned. The global name defaults to the entry's meta class name if it has not been named.
656 @param plane The plane object, or zero for the global name.
657 @result A reference to an OSSymbol for the name, which should be released by the caller. */
658
659 virtual const OSSymbol * copyName(
660 const IORegistryPlane * plane = 0 ) const;
661
662/*! @function compareNames
663 @abstract Compares the name of the entry with one or more names, and optionally returns the matching name.
664 @discussion This method is called during IOService name matching and elsewhere to compare the entry's global name with a list of names, or a single name. A list of names may be passed as any OSCollection of OSStrings, while a single name may be passed an OSString, in the name parameter. compareNames will call the compareName method for each name, for overrides.
665 @param name The name or names to compare with as any OSCollection (eg. OSArray, OSSet, OSDictionary) of OSStrings, or a single name may be passed an OSString.
666 @param matched If the caller wants the successfully matched name returned, pass a non-zero pointer for the matched parameter and an OSString will be returned here. It should be released by the caller.
667 @result True if one of the names compared true with the entry's global name. */
668
669 virtual bool compareNames( OSObject * name, OSString ** matched = 0 ) const;
670
671/*! @function compareName
672 @abstract Compares the name of the entry with one name, and optionally returns the matching name.
673 @discussion This method is called during IOService name matching and elsewhere from the compareNames method. It should be overridden to provide non-standard name matching.
674 @param name The name to compare with as an OSString.
675 @param matched If the caller wants the successfully matched name returned, pass a non-zero pointer for the matched parameter and an OSString will be returned here. It should be released by the caller. Generally, this will be the same as the name parameter, but may not be if wildcards are used.
676 @result True if the name compared true with the entry's global name. */
677
678 virtual bool compareName( OSString * name, OSString ** matched = 0 ) const;
679
680/*! @function setName
681 @abstract Sets a name for the registry entry, in a particular plane, or globally.
682 @discussion Entries can be named in a particular plane, or globally. If the plane is specified the name applies only to that plane, otherwise the global name is set. The global name defaults to the entry's meta class name if it has not been named.
683 @param name An OSSymbol which will be retained.
684 @param plane The plane object, or zero to set the global name. */
685
686 virtual void setName( const OSSymbol * name,
687 const IORegistryPlane * plane = 0 );
688
689/*! @function setName
690 @abstract Sets a name for the registry entry, in a particular plane, or globally.
691 @discussion Entries can be named in a particular plane, or globally. If the plane is specified the name applies only to that plane, otherwise the global name is set. The global name defaults to the entry's meta class name if it has not been named.
692 @param name A const C-string name which will be copied.
693 @param plane The plane object, or zero to set the global name. */
694
695 virtual void setName( const char * name,
696 const IORegistryPlane * plane = 0 );
697
698/*! @function getLocation
699 @abstract Returns the location string assigned to the registry entry as a C-string.
700 @discussion Entries can given a location string in a particular plane, or globally. If the entry has had a location set in a plane and the plane is specified that location string will be returned, otherwise the global location string is returned. If no global location string has been set, zero is returned.
701 @param plane The plane object, or zero for the global name.
702 @result A C-string location string, valid while the entry is retained, or zero. */
703
704 virtual const char * getLocation( const IORegistryPlane * plane = 0 ) const;
705
706/*! @function copyLocation
707 @abstract Returns the location string assigned to the registry entry as an OSSymbol.
708 @discussion Entries can given a location string in a particular plane, or globally. If the entry has had a location set in a plane and the plane is specified that location string will be returned, otherwise the global location string is returned. If no global location string has been set, zero is returned.
709 @param plane The plane object, or zero for the global name.
710 @result A reference to an OSSymbol for the location if one exists, which should be released by the caller, or zero. */
711
712 virtual const OSSymbol * copyLocation(
713 const IORegistryPlane * plane = 0 ) const;
714
715/*! @function setLocation
716 @abstract Sets a location string for the registry entry, in a particular plane, or globally.
717 @discussion Entries can be given a location string in a particular plane, or globally. If the plane is specified the location applies only to that plane, otherwise the global location is set. The location string may be used during path lookups of registry entries, to distinguish between sibling entries with the same name. The default IORegistryEntry parsing of location strings expects a list of hex numbers separated by commas, though subclasses of IORegistryEntry might do their own parsing.
718 @param location A C-string location string which will be copied, or an OSSymbol which will be retained.
719 @param plane The plane object, or zero to set the global location string. */
720
721 virtual void setLocation( const OSSymbol * location,
722 const IORegistryPlane * plane = 0 );
723 virtual void setLocation( const char * location,
724 const IORegistryPlane * plane = 0 );
725
726/*! @function getPath
727 @abstract Create a path for a registry entry.
728 @discussion The path for a registry entry is copied to the caller's buffer. The path describes the entry's attachment in a particular plane, which must be specified. The path begins with the plane name followed by a colon, and then followed by '/' separated path components for each of the entries between the root and the registry entry. Each component is constructed with the getPathComponent method called in each entry. An alias may also exist for the entry, which are described as properties in a registry entry found at /aliases in the plane. If a property value interpreted as a path in a call to IORegistryEntry::fromPath yields the entry, then the property name is used as the entry's path.
729 @param path A char buffer allocated by the caller.
730 @param length An in/out parameter - the caller sets the length of the buffer available, and getPath returns the total length of the path copied to the buffer.
731 @param plane The plane object.
732 @result getPath will fail if the entry is not attached in the plane, or if the buffer is not large enough to contain the path. */
733
734 virtual bool getPath( char * path, int * length,
735 const IORegistryPlane * plane) const;
736
737/*! @function getPathComponent
738 @abstract Create a path component for a registry entry.
739 @discussion Each component of a path created with getPath is created with getPathComponent. The default implementation concatenates the entry's name in the the plane, with the "at" symbol and the location string of the entry in the plane if it has been set.
740 @param path A char buffer allocated by the caller.
741 @param length An in/out parameter - the caller sets the length of the buffer available, and getPathComponent returns the total length of the path component copied to the buffer.
742 @param plane The plane object.
743 @result true if the path fits into the supplied buffer or false on a overflow. */
744
745 virtual bool getPathComponent( char * path, int * length,
746 const IORegistryPlane * plane ) const;
747
748/*! @function fromPath
749 @abstract Looks up a registry entry by path.
750 @discussion This function parses paths to lookup registry entries. The path may begin with the <plane name>: created by getPath, or the plane may be set by the caller. If there are characters remaining unparsed after an entry has been looked up, this may be considered an invalid lookup, or those characters may be passed back to the caller and the lookup successful.
751 @param path A C-string path.
752 @param plane The plane to lookup up the path, or zero, in which case the path must begin with the plane name.
753 @param residualPath If the path may contain residual characters after the last path component, the residual will be copied back to the caller's residualPath buffer. If there are residual characters and no residual buffer is specified, fromPath will fail.
754 @param residualLength An in/out parameter - the caller sets the length of the residual buffer available, and fromPath returns the total length of the residual path copied to the buffer. If there is no residualBuffer (residualPath = 0) then residualLength may be zero also.
755 @param fromEntry The lookup will proceed rooted at this entry if non-zero, otherwise it proceeds from the root of the plane.
756 @result A retained registry entry is returned on success, or zero on failure. The caller should release the entry. */
757
758 static IORegistryEntry * fromPath( const char * path,
759 const IORegistryPlane * plane = 0,
760 char * residualPath = 0,
761 int * residualLength = 0,
762 IORegistryEntry * fromEntry = 0 );
763
764/*! @function fromPath
765 @abstract Looks up a registry entry by relative path.
766 @discussion This function looks up a entry below the called entry by a relative path. It is just a convenience that calls IORegistryEntry::fromPath with this as the fromEntry parameter.
767 @param path See IORegistryEntry::fromPath.
768 @param plane See IORegistryEntry::fromPath.
769 @param residualPath See IORegistryEntry::fromPath.
770 @param residualLength See IORegistryEntry::fromPath.
771 @result See IORegistryEntry::fromPath. */
772
773 virtual IORegistryEntry * childFromPath( const char * path,
774 const IORegistryPlane * plane = 0,
775 char * residualPath = 0,
776 int * residualLength = 0 );
777
778/*! @function dealiasPath
779 @abstract Strips any aliases from the head of path and returns the full path.
780 @discussion If the path specified begins with an alias found in the /aliases entry, the value of the alias is returned, and a pointer into the passed in path after the alias is passed back to the caller. If an alias is not found, zero is returned and the path parameter is unchanged.
781 @param opath An in/out paramter - the caller passes in a pointer to a C-string pointer to a path. If an alias is found, dealiasPath returns a pointer into the path just beyond the end of the alias.
782 @param plane A plane object must be specified.
783 @result A C-string pointer to the value of the alias if one is found, or zero if not. */
784
785 static const char * dealiasPath( const char ** opath,
786 const IORegistryPlane * plane );
787
788/*! @function makePlane
789 @abstract Constructs an IORegistryPlane object.
790 @discussion Most planes in IOKit are created by the OS, although other planes may be created.
791 @param name A C-string name for the new plane, to be copied.
792 @result A new instance of an IORegistryPlane, or zero on failure. */
793
794 static const IORegistryPlane * makePlane( const char * name );
795
796/*! @abstract Returns an ID for the registry entry that is global to all tasks.
797 @discussion The entry ID returned by getRegistryEntryID can be used to identify a registry entry across all tasks. A registry entry may be looked up by its entry ID by creating a matching dictionary with IORegistryEntryIDMatching() in user space, or <code>IOService::registryEntryIDMatching()</code> in the kernel, to be used with the IOKit matching functions. The ID is valid only until the machine reboots.
798 @result An ID for the registry entry, assigned when the entry is first attached in the registry. */
799
800 uint64_t getRegistryEntryID( void );
801
802 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * */
803 /* * * * * * * * * * * * internals * * * * * * * * * * * */
804 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * */
805
806 virtual bool init( IORegistryEntry * from,
807 const IORegistryPlane * inPlane );
808
809#ifdef XNU_KERNEL_PRIVATE
810public:
811#else
812private:
813#endif
814 static IORegistryEntry * initialize( void );
815
816#ifdef XNU_KERNEL_PRIVATE
817 SInt32 getRegistryEntryGenerationCount( void ) const;
818#endif
819
820private:
821 inline bool arrayMember( OSArray * set,
822 const IORegistryEntry * member,
823 unsigned int * index = 0 ) const;
824
825 bool makeLink( IORegistryEntry * to,
826 unsigned int relation,
827 const IORegistryPlane * plane ) const;
828 void breakLink( IORegistryEntry * to,
829 unsigned int relation,
830 const IORegistryPlane * plane ) const;
831
832 APPLE_KEXT_COMPATIBILITY_VIRTUAL
833 OSArray * getParentSetReference( const IORegistryPlane * plane )
834 const;
835
836 APPLE_KEXT_COMPATIBILITY_VIRTUAL
837 OSArray * getChildSetReference( const IORegistryPlane * plane )
838 const;
839
840 APPLE_KEXT_COMPATIBILITY_VIRTUAL
841 IORegistryEntry * getChildFromComponent( const char ** path,
842 const IORegistryPlane * plane );
843
844 APPLE_KEXT_COMPATIBILITY_VIRTUAL
845 const OSSymbol * hasAlias( const IORegistryPlane * plane,
846 char * opath = 0, int * length = 0 ) const;
847
848 APPLE_KEXT_COMPATIBILITY_VIRTUAL
849 const char * matchPathLocation( const char * cmp,
850 const IORegistryPlane * plane );
851
852};
853
854/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
855
856/*! @class IORegistryIterator : public OSIterator
857 @abstract An iterator over the registry.
858 @discussion An iterator that can traverse the children or parents of a registry entry in a plane, and recurse. Access to the registry is protected against multiple threads, but an IORegistryIterator instance is for use by one thread only. */
859
860class IORegistryIterator : public OSIterator
861{
862 OSDeclareAbstractStructors(IORegistryIterator)
863
864private:
865 struct IORegCursor {
866 IORegCursor * next;
867 IORegistryEntry * current;
868 OSIterator * iter;
869 };
870 IORegCursor start;
871 IORegCursor * where;
872 IORegistryEntry * root;
873 OSOrderedSet * done;
874 const IORegistryPlane * plane;
875 IOOptionBits options;
876
877 virtual void free( void ) APPLE_KEXT_OVERRIDE;
878
879public:
880/*! @function iterateOver
881 @abstract Create an iterator rooted at a given registry entry.
882 @discussion This method creates an IORegistryIterator that is set up with options to iterate children or parents of a root entry, and to recurse automatically into entries as they are returned, or only when instructed. The iterator object keeps track of entries that have been recursed into previously to avoid loops.
883 @param start The root entry to begin the iteration at.
884 @param plane A plane object must be specified.
885 @param options kIORegistryIterateRecursively may be set to recurse automatically into each entry as it is returned. This option affects the behaviour of the getNextObject method, which is defined in the OSIterator superclass. Other methods will override this behaviour. kIORegistryIterateParents may be set to iterate the parents of each entry, by default the children are iterated.
886 @result A created IORegistryIterator instance, to be released by the caller when it has finished with it. */
887
888 static IORegistryIterator * iterateOver( IORegistryEntry * start,
889 const IORegistryPlane * plane,
890 IOOptionBits options = 0 );
891
892/*! @function iterateOver
893 @abstract Create an iterator rooted at the registry root.
894 @discussion This method creates an IORegistryIterator that is set up with options to iterate children of the registry root entry, and to recurse automatically into entries as they are returned, or only when instructed. The iterator object keeps track of entries that have been recursed into previously to avoid loops.
895 @param plane A plane object must be specified.
896 @param options kIORegistryIterateRecursively may be set to recurse automatically into each entry as it is returned. This option affects the behaviour of the getNextObject method, which is defined in the OSIterator superclass. Other methods will override this behaviour. kIORegistryIterateParents may be set to iterate the parents of each entry, by default the children are iterated.
897 @result A created IORegistryIterator instance, to be released by the caller when it has finished with it. */
898
899 static IORegistryIterator * iterateOver( const IORegistryPlane * plane,
900 IOOptionBits options = 0 );
901
902/*! @function getNextObject
903 @abstract Return the next object in the registry iteration.
904 @discussion This method calls either getNextObjectFlat or getNextObjectRecursive depending on the options the iterator was created with. This implements the OSIterator defined getNextObject method. The object returned is retained while the iterator is pointing at it (its the current entry), or recursing into it. The caller should not release it.
905 @result The next registry entry in the iteration (the current entry), or zero if the iteration has finished at this level of recursion. The entry returned is retained while the iterator is pointing at it (its the current entry), or recursing into it. The caller should not release it. */
906
907 virtual IORegistryEntry * getNextObject( void ) APPLE_KEXT_OVERRIDE;
908
909/*! @function getNextObjectFlat
910 @abstract Return the next object in the registry iteration, ignoring the kIORegistryIterateRecursively option.
911 @discussion This method returns the next child, or parent if the kIORegistryIterateParents option was used to create the iterator, of the current root entry. The object returned is retained while the iterator is pointing at it (its the current entry), or recursing into it. The caller should not release it.
912 @result The next registry entry in the iteration (the current entry), or zero if the iteration has finished at this level of recursion, or the iteration is invalid (see isValid). The entry returned is retained while the iterator is pointing at it (its the current entry), or recursing into it. The caller should not release it. */
913
914 virtual IORegistryEntry * getNextObjectFlat( void );
915
916/*! @function getNextObjectRecursive
917 @abstract Return the next object in the registry iteration, and enter it.
918 @discussion If the iterator has a current entry, and the iterator has not already entered previously, enterEntry is called to recurse into it, ie. make it the new root, and the next child, or parent if the kIORegistryIterateParents option was used to create the iterator, at this new level of recursion is returned. If there is no current entry at this level of recursion, exitEntry is called and the process repeats, until the iteration returns to the entry the iterator was created with and zero is returned. The object returned is retained while the iterator is pointing at it (its the current entry), or recursing into it. The caller should not release it.
919 @result The next registry entry in the iteration (the current entry), or zero if its finished, or the iteration is invalid (see isValid). The entry returned is retained while the iterator is pointing at it (its the current entry), or recursing into it. The caller should not release it. */
920
921 virtual IORegistryEntry * getNextObjectRecursive( void );
922
923/*! @function getCurrentEntry
924 @abstract Return the current entry in the registry iteration.
925 @discussion This method returns the current entry, last returned by getNextObject et al. The object returned is retained while the iterator is pointing at it (its the current entry), or recursing into it. The caller should not release it. If the iteration is no longer valid (see isValid), the current entry is zero.
926 @result The current registry entry in the iteration, or zero if the last iteration returned zero, or the iteration is invalid (see isValid). The entry returned is retained while the iterator is pointing at it (its the current entry), or recursing into it. The caller should not release it. */
927
928 virtual IORegistryEntry * getCurrentEntry( void );
929
930/*! @function enterEntry
931 @abstract Recurse into the current entry in the registry iteration.
932 @discussion This method makes the current entry, ie. the last entry returned by getNextObject et al., the root in a new level of recursion. */
933
934 virtual void enterEntry( void );
935
936/*! @function enterEntry
937 @abstract Recurse into the current entry in the registry iteration.
938 @discussion This method recurses into an entry as with enterEntry, but also switches from the current plane to a new one set by the caller.
939 @param plane The new plane to switch into. */
940
941 virtual void enterEntry( const IORegistryPlane * plane );
942
943/*! @function exitEntry
944 @abstract Exits a level of recursion, restoring the current entry.
945 @discussion This method undoes an enterEntry, restoring the current entry. If there are no more levels of recursion to exit false is returned, otherwise true is returned.
946 @result true if a level of recursion was undone, false if no recursive levels are left in the iteration. */
947
948 virtual bool exitEntry( void );
949
950/*! @function reset
951 @abstract Exits all levels of recursion, restoring the iterator to its state at creation.
952 @discussion This method exits all levels of recursion, and restores the iterator to its state at creation. */
953
954 virtual void reset( void ) APPLE_KEXT_OVERRIDE;
955
956/*! @function isValid
957 @abstract Checks that no registry changes have invalidated the iteration.
958 @discussion If a registry iteration is invalidated by changes to the registry, it will be made invalid, the currentEntry will be considered zero, and further calls to getNextObject et al. will return zero. The iterator should be reset to restart the iteration when this happens.
959 @result false if the iterator has been invalidated by changes to the registry, true otherwise. */
960
961 virtual bool isValid( void ) APPLE_KEXT_OVERRIDE;
962
963/*! @function iterateAll
964 @abstract Iterates all entries (with getNextObject) and returns a set of all returned entries.
965 @discussion This method will reset, then iterate all entries in the iteration (with getNextObject).
966 @result A set of entries returned by the iteration. The caller should release the set when it has finished with it. Zero is returned on a resource failure. */
967
968 virtual OSOrderedSet * iterateAll( void );
969};
970
971#endif /* _IOKIT_IOREGISTRYENTRY_H */
972