dll/win32/smdll/query.c

   1 /* $Id$
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS system libraries
   5  * FILE:            lib/smdll/query.c
   6  * PURPOSE:         Call SM API SM_API_QUERY_INFORMATION (not in NT)
   7  */
   8 #define WIN32_NO_STATUS
   9 #include <windows.h>
  10 #define NTOS_MODE_USER
  11 #include <ndk/ntndk.h>
  12 #include <sm/helper.h>
  13
  14 #define NDEBUG
  15 #include <debug.h>
  16
  17
  18 /**********************************************************************
  19  * NAME                                                 EXPORTED
  20  *      SmQueryInformation/5
  21  *
  22  * DESCRIPTION
  23  *      Ask the SM to collect some data from its internal data
  24  *      structures and send it back.
  25  *
  26  * ARGUMENTS
  27  *      hSmApiPort: handle returned by SmConnectApiPort;
  28  *      SmInformationClass: an SM information class ID:
  29  *              SM_BASIC_INFORMATION: the number of registered subsystems
  30  *      Data: pointer to storage for the information to request;
  31  *      DataLength: length in bytes of the Data buffer; it must be
  32  *              set and must match the SmInformationClass info size;
  33  *      ReturnedDataLength: optional pointer to storage to receive
  34  *              the size of the returnede data.
  35  *
  36  * RETURN VALUE
  37  *      STATUS_SUCCESS: OK you get what you asked for;
  38  *      STATUS_INFO_LENGTH_MISMATCH: you set DataLength to 0 or to a
  39  *              value that does not match whet the SmInformationClass
  40  *              requires;
  41  *      STATUS_INVALID_PARAMETER_2: bad information class;
  42  *      A port error.
  43  *
  44  */
  45 NTSTATUS WINAPI
  46 SmQueryInformation (IN      HANDLE                hSmApiPort,
  47                     IN      SM_INFORMATION_CLASS  SmInformationClass,
  48                     IN OUT  PVOID                 Data,
  49                     IN      ULONG                 DataLength,
  50                     IN OUT  PULONG                ReturnedDataLength OPTIONAL)
  51 {
  52         NTSTATUS         Status = STATUS_SUCCESS;
  53         SM_PORT_MESSAGE  SmReqMsg;
  54
  55
  56         if(0 == DataLength)
  57         {
  58                 return STATUS_INFO_LENGTH_MISMATCH;
  59         }
  60         /* Marshal data in the port message */
  61         switch (SmInformationClass)
  62         {
  63                 case SmBasicInformation:
  64                         if(DataLength != sizeof (SM_BASIC_INFORMATION))
  65                         {
  66                                 return STATUS_INFO_LENGTH_MISMATCH;
  67                         }
  68                         SmReqMsg.Request.QryInfo.SmInformationClass = SmBasicInformation;
  69                         SmReqMsg.Request.QryInfo.DataLength = DataLength;
  70                         SmReqMsg.Request.QryInfo.BasicInformation.SubSystemCount = 0;
  71                         break;
  72                 case SmSubSystemInformation:
  73                         if(DataLength != sizeof (SM_SUBSYSTEM_INFORMATION))
  74                         {
  75                                 return STATUS_INFO_LENGTH_MISMATCH;
  76                         }
  77                         SmReqMsg.Request.QryInfo.SmInformationClass = SmSubSystemInformation;
  78                         SmReqMsg.Request.QryInfo.DataLength = DataLength;
  79                         SmReqMsg.Request.QryInfo.SubSystemInformation.SubSystemId =
  80                                 ((PSM_SUBSYSTEM_INFORMATION)Data)->SubSystemId;
  81                         break;
  82                 default:
  83                         return STATUS_INVALID_PARAMETER_2;
  84         }
  85         /* SM API to invoke */
  86         SmReqMsg.SmHeader.ApiIndex = SM_API_QUERY_INFORMATION;
  87
  88         /* Prepare the port request message */
  89         SmReqMsg.Header.u2.s2.Type = LPC_NEW_MESSAGE;
  90         SmReqMsg.Header.u1.s1.DataLength    = SM_PORT_DATA_SIZE(SmReqMsg.Request);
  91         SmReqMsg.Header.u1.s1.TotalLength = SM_PORT_MESSAGE_SIZE;
  92         Status = NtRequestWaitReplyPort (hSmApiPort, (PPORT_MESSAGE) & SmReqMsg, (PPORT_MESSAGE) & SmReqMsg);
  93         if (NT_SUCCESS(Status))
  94         {
  95                 /* Unmarshal data */
  96                 RtlCopyMemory (Data, & SmReqMsg.Reply.QryInfo.BasicInformation, SmReqMsg.Reply.QryInfo.DataLength);
  97                 /* Use caller provided storage to store data size */
  98                 if(NULL != ReturnedDataLength)
  99                 {
 100                         *ReturnedDataLength = SmReqMsg.Reply.QryInfo.DataLength;
 101                 }
 102                 return SmReqMsg.SmHeader.Status;
 103         }
 104         DPRINT("SMLIB: %s failed (Status=0x%08lx)\n", __FUNCTION__, Status);
 105         return Status;
 106 }
 107 /* EOF */