reactos/dll/win32/smdll/query.c
Hermès Bélusca-Maïto 65ce146169 Create a branch for working on csrss and co.
svn path=/branches/ros-csrss/; revision=57561
2012-10-14 13:04:31 +00:00

105 lines
3.3 KiB
C

/* $Id$
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS system libraries
* FILE: lib/smdll/query.c
* PURPOSE: Call SM API SM_API_QUERY_INFORMATION (not in NT)
*/
#include <precomp.h>
#define NDEBUG
#include <debug.h>
/**********************************************************************
* NAME EXPORTED
* SmQueryInformation/5
*
* DESCRIPTION
* Ask the SM to collect some data from its internal data
* structures and send it back.
*
* ARGUMENTS
* hSmApiPort: handle returned by SmConnectApiPort;
* SmInformationClass: an SM information class ID:
* SM_BASIC_INFORMATION: the number of registered subsystems
* Data: pointer to storage for the information to request;
* DataLength: length in bytes of the Data buffer; it must be
* set and must match the SmInformationClass info size;
* ReturnedDataLength: optional pointer to storage to receive
* the size of the returnede data.
*
* RETURN VALUE
* STATUS_SUCCESS: OK you get what you asked for;
* STATUS_INFO_LENGTH_MISMATCH: you set DataLength to 0 or to a
* value that does not match whet the SmInformationClass
* requires;
* STATUS_INVALID_PARAMETER_2: bad information class;
* A port error.
*
*/
NTSTATUS WINAPI
SmQueryInformation (IN HANDLE hSmApiPort,
IN SM_INFORMATION_CLASS SmInformationClass,
IN OUT PVOID Data,
IN ULONG DataLength,
IN OUT PULONG ReturnedDataLength OPTIONAL)
{
NTSTATUS Status = STATUS_SUCCESS;
SM_PORT_MESSAGE SmReqMsg;
if(0 == DataLength)
{
return STATUS_INFO_LENGTH_MISMATCH;
}
/* Marshal data in the port message */
switch (SmInformationClass)
{
case SmBasicInformation:
if(DataLength != sizeof (SM_BASIC_INFORMATION))
{
return STATUS_INFO_LENGTH_MISMATCH;
}
SmReqMsg.Request.QryInfo.SmInformationClass = SmBasicInformation;
SmReqMsg.Request.QryInfo.DataLength = DataLength;
SmReqMsg.Request.QryInfo.BasicInformation.SubSystemCount = 0;
break;
case SmSubSystemInformation:
if(DataLength != sizeof (SM_SUBSYSTEM_INFORMATION))
{
return STATUS_INFO_LENGTH_MISMATCH;
}
SmReqMsg.Request.QryInfo.SmInformationClass = SmSubSystemInformation;
SmReqMsg.Request.QryInfo.DataLength = DataLength;
SmReqMsg.Request.QryInfo.SubSystemInformation.SubSystemId =
((PSM_SUBSYSTEM_INFORMATION)Data)->SubSystemId;
break;
default:
return STATUS_INVALID_PARAMETER_2;
}
/* SM API to invoke */
SmReqMsg.SmHeader.ApiIndex = SM_API_QUERY_INFORMATION;
/* Prepare the port request message */
SmReqMsg.Header.u2.s2.Type = LPC_NEW_MESSAGE;
SmReqMsg.Header.u1.s1.DataLength = SM_PORT_DATA_SIZE(SmReqMsg.Request);
SmReqMsg.Header.u1.s1.TotalLength = SM_PORT_MESSAGE_SIZE;
Status = NtRequestWaitReplyPort (hSmApiPort, (PPORT_MESSAGE) & SmReqMsg, (PPORT_MESSAGE) & SmReqMsg);
if (NT_SUCCESS(Status))
{
/* Unmarshal data */
RtlCopyMemory (Data, & SmReqMsg.Reply.QryInfo.BasicInformation, SmReqMsg.Reply.QryInfo.DataLength);
/* Use caller provided storage to store data size */
if(NULL != ReturnedDataLength)
{
*ReturnedDataLength = SmReqMsg.Reply.QryInfo.DataLength;
}
return SmReqMsg.SmHeader.Status;
}
DPRINT("SMLIB: %s failed (Status=0x%08lx)\n", __FUNCTION__, Status);
return Status;
}
/* EOF */