reactos操作系统实现(72)

ReactOS通过对象管理机制为内核提供了一致的和安全的访问方式。对象管理器是一个用于创建、删除、保护和跟踪对象的内核一部份。由于I/O管理的设备是多方面的，就需要创建很多对象来表达这种设备，下面就来了解关于I/O相关的对象，初始化的代码如下：

#001 BOOLEAN

#002 INIT_FUNCTION

#003 NTAPI

#004 IopCreateObjectTypes(VOID)

#005 {

#006 OBJECT_TYPE_INITIALIZER ObjectTypeInitializer;

#007 UNICODE_STRING Name;

#008

初始化对象为缺省的设置。

#009 /* Initialize default settings */

#010 RtlZeroMemory(&ObjectTypeInitializer,sizeof(ObjectTypeInitializer));

#011 ObjectTypeInitializer.Length = sizeof(ObjectTypeInitializer);

#012 ObjectTypeInitializer.PoolType = NonPagedPool;

#013 ObjectTypeInitializer.InvalidAttributes = OBJ_OPENLINK;

#014 ObjectTypeInitializer.ValidAccessMask = FILE_ALL_ACCESS;

#015 ObjectTypeInitializer.UseDefaultObject = TRUE;

#016 ObjectTypeInitializer.GenericMapping = IopFileMapping;

#017

创建适配器对象。

#018 /* Do the Adapter Type */

#019 RtlInitUnicodeString(&Name,L"Adapter");

#020 if (!NT_SUCCESS(ObCreateObjectType(&Name,

#021 &ObjectTypeInitializer,

#022 NULL,

#023 &IoAdapterObjectType))) return FALSE;

#024

创建控制器对象。

#025 /* Do the Controller Type */

#026 RtlInitUnicodeString(&Name,L"Controller");

#027 ObjectTypeInitializer.DefaultNonPagedPoolCharge = sizeof(CONTROLLER_OBJECT);

#028 if (!NT_SUCCESS(ObCreateObjectType(&Name,

#029 &ObjectTypeInitializer,

#030 NULL,

#031 &IoControllerObjectType))) return FALSE;

#032

创建设备对象，设置分析回调函数是IopParseDevice。

#033 /* Do the Device Type. FIXME: Needs Delete Routine! */

#034 RtlInitUnicodeString(&Name,L"Device");

#035 ObjectTypeInitializer.DefaultNonPagedPoolCharge = sizeof(DEVICE_OBJECT);

#036 ObjectTypeInitializer.ParseProcedure = IopParseDevice;

#037 ObjectTypeInitializer.SecurityProcedure = IopSecurityFile;

#038 if (!NT_SUCCESS(ObCreateObjectType(&Name,

#039 &ObjectTypeInitializer,

#040 NULL,

#041 &IoDeviceObjectType))) return FALSE;

#042

创建驱动程序对象。

#043 /* Initialize the Driver object type */

#044 RtlInitUnicodeString(&Name,L"Driver");

#045 ObjectTypeInitializer.DefaultNonPagedPoolCharge = sizeof(DRIVER_OBJECT);

#046 ObjectTypeInitializer.DeleteProcedure = IopDeleteDriver;

#047 ObjectTypeInitializer.ParseProcedure = NULL;

#048 ObjectTypeInitializer.SecurityProcedure = NULL;

#049 if (!NT_SUCCESS(ObCreateObjectType(&Name,

#050 &ObjectTypeInitializer,

#051 NULL,

#052 &IoDriverObjectType))) return FALSE;

#053

创建I/O端口完成对象。

#054 /* Initialize the I/O Completion object type */

#055 RtlInitUnicodeString(&Name,L"IoCompletion");

#056 ObjectTypeInitializer.DefaultNonPagedPoolCharge = sizeof(KQUEUE);

#057 ObjectTypeInitializer.ValidAccessMask = IO_COMPLETION_ALL_ACCESS;

#058 ObjectTypeInitializer.InvalidAttributes |= OBJ_PERMANENT;

#059 ObjectTypeInitializer.GenericMapping = IopCompletionMapping;

#060 ObjectTypeInitializer.DeleteProcedure = IopDeleteIoCompletion;

#061 if (!NT_SUCCESS(ObCreateObjectType(&Name,

#062 &ObjectTypeInitializer,

#063 NULL,

#064 &IoCompletionType))) return FALSE;

#065

创建文件对象。

#066 /* Initialize the File object type */

#067 RtlInitUnicodeString(&Name,L"File");

#068 ObjectTypeInitializer.DefaultNonPagedPoolCharge = sizeof(FILE_OBJECT);

#069 ObjectTypeInitializer.InvalidAttributes |= OBJ_EXCLUSIVE;

#070 ObjectTypeInitializer.MaintainHandleCount = TRUE;

#071 ObjectTypeInitializer.ValidAccessMask = FILE_ALL_ACCESS;

#072 ObjectTypeInitializer.GenericMapping = IopFileMapping;

#073 ObjectTypeInitializer.CloseProcedure = IopCloseFile;

#074 ObjectTypeInitializer.DeleteProcedure = IopDeleteFile;

#075 ObjectTypeInitializer.SecurityProcedure = IopSecurityFile;

#076 ObjectTypeInitializer.QueryNameProcedure = IopQueryNameFile;

#077 ObjectTypeInitializer.ParseProcedure = IopParseFile;

#078 ObjectTypeInitializer.UseDefaultObject = FALSE;

#079 if (!NT_SUCCESS(ObCreateObjectType(&Name,

#080 &ObjectTypeInitializer,

#081 NULL,

#082 &IoFileObjectType))) return FALSE;

#083

#084 /* Success */

#085 return TRUE;

#086 }

这里主要就是根据不同的对象，设置不同的特性。

（编辑：李大同）

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