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Create a branch for header work.

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svn path=/branches/header-work/; revision=45691
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Timo Kreuzer 2010-02-26 22:57:55 +00:00
parent 14fe274b1c
commit 9ea495ba33
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lib/epsapi/enum/processes.c Normal file
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/* $Id$
*/
/*
* COPYRIGHT: See COPYING in the top level directory
* LICENSE: See LGPL.txt in the top level directory
* PROJECT: ReactOS system libraries
* FILE: reactos/lib/epsapi/enum/processes.c
* PURPOSE: Enumerate processes and threads
* PROGRAMMER: KJK::Hyperion <noog@libero.it>
* UPDATE HISTORY:
* 10/06/2002: Created
* 29/08/2002: Generalized the interface to improve reusability,
* more efficient use of memory operations
* 12/02/2003: malloc and free renamed to PsaiMalloc and PsaiFree,
* for better reusability. PsaEnumerateProcesses now
* expanded into:
* - PsaCaptureProcessesAndThreads
* - PsaFreeCapture
* - PsaWalkProcessesAndThreads
* - PsaWalkProcesses
* - PsaWalkThreads
* - PsaWalkFirstProcess
* - PsaWalkNextProcess
* - PsaWalkFirstThread
* - PsaWalkNextThread
* - PsaEnumerateProcessesAndThreads
* - PsaEnumerateProcesses
* - PsaEnumerateThreads
* 12/04/2003: internal PSAPI renamed EPSAPI (Extended PSAPI) and
* isolated in its own library to clear the confusion
* and improve reusability
*/
#define WIN32_NO_STATUS
#include <windows.h>
#define NTOS_MODE_USER
#include <ndk/ntndk.h>
#include <epsapi/epsapi.h>
#define NDEBUG
#include <debug.h>
NTSTATUS NTAPI
PsaCaptureProcessesAndThreads(OUT PSYSTEM_PROCESS_INFORMATION *ProcessesAndThreads)
{
PSYSTEM_PROCESS_INFORMATION pInfoBuffer = NULL;
SIZE_T nSize = 0x8000;
NTSTATUS Status;
if(ProcessesAndThreads == NULL)
{
return STATUS_INVALID_PARAMETER_1;
}
/* FIXME: if the system has loaded several processes and threads, the buffer
could get really big. But if there's several processes and threads, the
system is already under stress, and a huge buffer could only make things
worse. The function should be profiled to see what's the average minimum
buffer size, to succeed on the first shot */
do
{
PVOID pTmp;
/* free the buffer, and reallocate it to the new size. RATIONALE: since we
ignore the buffer's contents at this point, there's no point in a realloc()
that could end up copying a large chunk of data we'd discard anyway */
PsaiFree(pInfoBuffer);
pTmp = PsaiMalloc(nSize);
if(pTmp == NULL)
{
DPRINT(FAILED_WITH_STATUS, "PsaiMalloc", STATUS_NO_MEMORY);
Status = STATUS_NO_MEMORY;
break;
}
pInfoBuffer = pTmp;
/* query the information */
Status = NtQuerySystemInformation(SystemProcessInformation,
pInfoBuffer,
nSize,
NULL);
/* double the buffer size */
nSize *= 2;
} while(Status == STATUS_INFO_LENGTH_MISMATCH);
if(!NT_SUCCESS(Status))
{
DPRINT(FAILED_WITH_STATUS, "NtQuerySystemInformation", Status);
return Status;
}
*ProcessesAndThreads = pInfoBuffer;
return STATUS_SUCCESS;
}
NTSTATUS NTAPI
PsaWalkProcessesAndThreads(IN PSYSTEM_PROCESS_INFORMATION ProcessesAndThreads,
IN PPROC_ENUM_ROUTINE ProcessCallback,
IN OUT PVOID ProcessCallbackContext,
IN PTHREAD_ENUM_ROUTINE ThreadCallback,
IN OUT PVOID ThreadCallbackContext)
{
NTSTATUS Status;
if(ProcessCallback == NULL && ThreadCallback == NULL)
{
return STATUS_INVALID_PARAMETER;
}
Status = STATUS_SUCCESS;
ProcessesAndThreads = PsaWalkFirstProcess(ProcessesAndThreads);
/* scan the process list */
do
{
if(ProcessCallback)
{
Status = ProcessCallback(ProcessesAndThreads, ProcessCallbackContext);
if(!NT_SUCCESS(Status))
{
break;
}
}
/* if the caller provided a thread callback */
if(ThreadCallback)
{
ULONG i;
PSYSTEM_THREAD_INFORMATION pCurThread;
/* scan the current process's thread list */
for(i = 0, pCurThread = PsaWalkFirstThread(ProcessesAndThreads);
i < ProcessesAndThreads->NumberOfThreads;
i++, pCurThread = PsaWalkNextThread(pCurThread))
{
Status = ThreadCallback(pCurThread, ThreadCallbackContext);
if(!NT_SUCCESS(Status))
{
goto Bail;
}
}
}
/* move to the next process */
ProcessesAndThreads = PsaWalkNextProcess(ProcessesAndThreads);
} while(ProcessesAndThreads);
Bail:
return Status;
}
NTSTATUS NTAPI
PsaEnumerateProcessesAndThreads(IN PPROC_ENUM_ROUTINE ProcessCallback,
IN OUT PVOID ProcessCallbackContext,
IN PTHREAD_ENUM_ROUTINE ThreadCallback,
IN OUT PVOID ThreadCallbackContext)
{
PSYSTEM_PROCESS_INFORMATION pInfoBuffer = NULL;
NTSTATUS Status;
if(ProcessCallback == NULL && ThreadCallback == NULL)
{
return STATUS_INVALID_PARAMETER;
}
/* get the processes and threads list */
Status = PsaCaptureProcessesAndThreads(&pInfoBuffer);
if(!NT_SUCCESS(Status))
{
goto Bail;
}
/* walk the processes and threads list */
Status = PsaWalkProcessesAndThreads(pInfoBuffer,
ProcessCallback,
ProcessCallbackContext,
ThreadCallback,
ThreadCallbackContext);
Bail:
PsaFreeCapture(pInfoBuffer);
return Status;
}
VOID NTAPI
PsaFreeCapture(IN PVOID Capture)
{
PsaiFree(Capture);
}
NTSTATUS NTAPI
PsaWalkProcesses(IN PSYSTEM_PROCESS_INFORMATION ProcessesAndThreads,
IN PPROC_ENUM_ROUTINE Callback,
IN OUT PVOID CallbackContext)
{
return PsaWalkProcessesAndThreads(ProcessesAndThreads,
Callback,
CallbackContext,
NULL,
NULL);
}
NTSTATUS NTAPI
PsaWalkThreads(IN PSYSTEM_PROCESS_INFORMATION ProcessesAndThreads,
IN PTHREAD_ENUM_ROUTINE Callback,
IN OUT PVOID CallbackContext)
{
return PsaWalkProcessesAndThreads(ProcessesAndThreads,
NULL,
NULL,
Callback,
CallbackContext);
}
NTSTATUS NTAPI
PsaEnumerateProcesses(IN PPROC_ENUM_ROUTINE Callback,
IN OUT PVOID CallbackContext)
{
return PsaEnumerateProcessesAndThreads(Callback,
CallbackContext,
NULL,
NULL);
}
NTSTATUS NTAPI
PsaEnumerateThreads(IN PTHREAD_ENUM_ROUTINE Callback,
IN OUT PVOID CallbackContext)
{
return PsaEnumerateProcessesAndThreads(NULL,
NULL,
Callback,
CallbackContext);
}
PSYSTEM_PROCESS_INFORMATION FASTCALL
PsaWalkFirstProcess(IN PSYSTEM_PROCESS_INFORMATION ProcessesAndThreads)
{
return ProcessesAndThreads;
}
PSYSTEM_PROCESS_INFORMATION FASTCALL
PsaWalkNextProcess(IN PSYSTEM_PROCESS_INFORMATION CurrentProcess)
{
if(CurrentProcess->NextEntryOffset == 0)
{
return NULL;
}
else
{
return (PSYSTEM_PROCESS_INFORMATION)((ULONG_PTR)CurrentProcess + CurrentProcess->NextEntryOffset);
}
}
PSYSTEM_THREAD_INFORMATION FASTCALL
PsaWalkFirstThread(IN PSYSTEM_PROCESS_INFORMATION CurrentProcess)
{
static SIZE_T nOffsetOfThreads = 0;
/* get the offset of the Threads field */
nOffsetOfThreads = sizeof(SYSTEM_PROCESS_INFORMATION);
return (PSYSTEM_THREAD_INFORMATION)((ULONG_PTR)CurrentProcess + nOffsetOfThreads);
}
PSYSTEM_THREAD_INFORMATION FASTCALL
PsaWalkNextThread(IN PSYSTEM_THREAD_INFORMATION CurrentThread)
{
return (PSYSTEM_THREAD_INFORMATION)((ULONG_PTR)CurrentThread +
((sizeof(SYSTEM_PROCESS_INFORMATION) + sizeof(SYSTEM_THREAD_INFORMATION)) -
sizeof(SYSTEM_PROCESS_INFORMATION)));
}
/* EOF */