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