dll/win32/smdll/query.c

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