From 0ef49e34840369f8434e06810b7f4acb6bf61138 Mon Sep 17 00:00:00 2001 From: Hartmut Birr Date: Tue, 7 May 2002 22:41:22 +0000 Subject: [PATCH] Modified reading of pipes. Fixed some bugs. svn path=/trunk/; revision=2936 --- reactos/drivers/fs/np/npfs.h | 13 +++ reactos/drivers/fs/np/rw.c | 180 ++++++++++++++++++----------------- 2 files changed, 108 insertions(+), 85 deletions(-) diff --git a/reactos/drivers/fs/np/npfs.h b/reactos/drivers/fs/np/npfs.h index b8f2697e08a..0309cf1e9c2 100644 --- a/reactos/drivers/fs/np/npfs.h +++ b/reactos/drivers/fs/np/npfs.h @@ -1,3 +1,5 @@ +/* $Id: npfs.h,v 1.11 2002/05/07 22:41:22 hbirr Exp $ */ + #ifndef __SERVICES_FS_NP_NPFS_H #define __SERVICES_FS_NP_NPFS_H @@ -66,6 +68,17 @@ extern NPAGED_LOOKASIDE_LIST NpfsPipeDataLookasideList; #define CP DPRINT("\n"); +static inline VOID +NpfsFreePipeData(PNPFS_PIPE_DATA PipeData) +{ + if (PipeData->Data) + { + ExFreePool(PipeData->Data); + } + ExFreeToNPagedLookasideList(&NpfsPipeDataLookasideList, PipeData); +} + + NTSTATUS STDCALL NpfsCreate(PDEVICE_OBJECT DeviceObject, PIRP Irp); NTSTATUS STDCALL NpfsCreateNamedPipe(PDEVICE_OBJECT DeviceObject, PIRP Irp); NTSTATUS STDCALL NpfsClose(PDEVICE_OBJECT DeviceObject, PIRP Irp); diff --git a/reactos/drivers/fs/np/rw.c b/reactos/drivers/fs/np/rw.c index 00e2c7b81d9..5988aeb165b 100644 --- a/reactos/drivers/fs/np/rw.c +++ b/reactos/drivers/fs/np/rw.c @@ -1,4 +1,4 @@ -/* $Id: rw.c,v 1.5 2001/11/20 20:34:29 ekohl Exp $ +/* $Id: rw.c,v 1.6 2002/05/07 22:41:22 hbirr Exp $ * * COPYRIGHT: See COPYING in the top level directory * PROJECT: ReactOS kernel @@ -18,18 +18,6 @@ /* FUNCTIONS *****************************************************************/ -static inline VOID -NpfsFreePipeData(PNPFS_PIPE_DATA PipeData) -{ - if (PipeData->Data) - { - ExFreePool(PipeData->Data); - } - - ExFreeToNPagedLookasideList(&NpfsPipeDataLookasideList, PipeData); -} - - static inline PNPFS_PIPE_DATA NpfsAllocatePipeData(PVOID Data, ULONG Size) @@ -94,7 +82,6 @@ NpfsRead(PDEVICE_OBJECT DeviceObject, PIRP Irp) ULONG Length; PVOID Buffer; ULONG CopyLength; - BOOLEAN DataListEmpty; DPRINT("NpfsRead(DeviceObject %p Irp %p)\n", DeviceObject, Irp); @@ -109,7 +96,7 @@ NpfsRead(PDEVICE_OBJECT DeviceObject, PIRP Irp) { DPRINT("Pipe is NOT connected!\n"); Status = STATUS_UNSUCCESSFUL; - Length = 0; + Information = 0; goto done; } @@ -117,99 +104,120 @@ NpfsRead(PDEVICE_OBJECT DeviceObject, PIRP Irp) { DPRINT("Irp->MdlAddress == NULL\n"); Status = STATUS_UNSUCCESSFUL; - Length = 0; + Information = 0; goto done; } Status = STATUS_SUCCESS; Length = IoStack->Parameters.Read.Length; + Information = 0; Buffer = MmGetSystemAddressForMdl(Irp->MdlAddress); DPRINT("Length %d Buffer %x\n",Length,Buffer); KeAcquireSpinLock(&ReadFcb->DataListLock, &OldIrql); - DataListEmpty = IsListEmpty(&ReadFcb->DataListHead); - KeReleaseSpinLock(&ReadFcb->DataListLock, OldIrql); - - /* FIXME: check if in blocking mode */ - if (DataListEmpty == TRUE) - { - /* Wait for ReadEvent to become signaled */ - DPRINT("Waiting for readable data\n"); - Status = KeWaitForSingleObject(&Fcb->ReadEvent, - UserRequest, - KernelMode, - FALSE, - NULL); - DPRINT("Finished waiting! Status: %x\n", Status); - } - - KeAcquireSpinLock(&ReadFcb->DataListLock, &OldIrql); - - if (Pipe->PipeReadMode & FILE_PIPE_BYTE_STREAM_MODE) - { - DPRINT("Byte stream mode\n"); - - /* Byte stream mode */ - Information = 0; - CurrentEntry = ReadFcb->DataListHead.Flink; - while ((Length > 0) && (CurrentEntry = RemoveHeadList(&ReadFcb->DataListHead))) + while (1) + { + /* FIXME: check if in blocking mode */ + if (IsListEmpty(&ReadFcb->DataListHead)) + { + KeResetEvent(&Fcb->ReadEvent); + KeReleaseSpinLock(&ReadFcb->DataListLock, OldIrql); + if (Information > 0) { - Current = CONTAINING_RECORD(CurrentEntry, NPFS_PIPE_DATA, ListEntry); - - DPRINT("Took pipe data at %p off the queue\n", Current); - - CopyLength = RtlMin(Current->Size, Length); - RtlCopyMemory(Buffer, - ((PVOID)((ULONG_PTR)Current->Data + Current->Offset)), - CopyLength); - Buffer += CopyLength; - Length -= CopyLength; - Information += CopyLength; - - /* Update the data buffer */ - Current->Offset += CopyLength; - Current->Size -= CopyLength; - - CurrentEntry = CurrentEntry->Flink; + Status = STATUS_SUCCESS; + goto done; + } + if (Fcb->PipeState != FILE_PIPE_CONNECTED_STATE) + { + Status = STATUS_PIPE_BROKEN; + goto done; + } + /* Wait for ReadEvent to become signaled */ + DPRINT("Waiting for readable data (%S)\n", Pipe->PipeName.Buffer); + Status = KeWaitForSingleObject(&Fcb->ReadEvent, + UserRequest, + KernelMode, + FALSE, + NULL); + DPRINT("Finished waiting (%S)! Status: %x\n", Pipe->PipeName.Buffer, Status); + KeAcquireSpinLock(&ReadFcb->DataListLock, &OldIrql); + } + + if (Pipe->PipeReadMode == FILE_PIPE_BYTE_STREAM_MODE) + { + DPRINT("Byte stream mode\n"); + + /* Byte stream mode */ + CurrentEntry = NULL; + while (Length > 0 && !IsListEmpty(&ReadFcb->DataListHead)) + { + CurrentEntry = RemoveHeadList(&ReadFcb->DataListHead); + Current = CONTAINING_RECORD(CurrentEntry, NPFS_PIPE_DATA, ListEntry); + + DPRINT("Took pipe data at %p off the queue\n", Current); + + CopyLength = RtlMin(Current->Size, Length); + RtlCopyMemory(Buffer, + ((PVOID)((PVOID)Current->Data + Current->Offset)), + CopyLength); + Buffer += CopyLength; + Length -= CopyLength; + Information += CopyLength; + + /* Update the data buffer */ + Current->Offset += CopyLength; + Current->Size -= CopyLength; + if (Current->Size == 0) + { + NpfsFreePipeData(Current); + CurrentEntry = NULL; + } } - if ((CurrentEntry != &ReadFcb->DataListHead) && (Current->Offset != Current->Size)) + if (CurrentEntry && Current->Size > 0) { - DPRINT("Putting pipe data at %p back in queue\n", Current); + DPRINT("Putting pipe data at %p back in queue\n", Current); - /* The caller's buffer could not contain the complete message, - so put it back on the queue */ - InsertHeadList(&ReadFcb->DataListHead, &Current->ListEntry); + /* The caller's buffer could not contain the complete message, + so put it back on the queue */ + InsertHeadList(&ReadFcb->DataListHead, &Current->ListEntry); } - } - else - { - DPRINT("Message mode\n"); - /* Message mode */ - CurrentEntry = ReadFcb->DataListHead.Flink; - if (CurrentEntry = RemoveHeadList(&ReadFcb->DataListHead)) + if (Length == 0) { - Current = CONTAINING_RECORD(CurrentEntry, NPFS_PIPE_DATA, ListEntry); + break; + } + } + else + { + DPRINT("Message mode\n"); - DPRINT("Took pipe data at %p off the queue\n", Current); + /* Message mode */ + if (!IsListEmpty(&ReadFcb->DataListHead)) + { + CurrentEntry = RemoveHeadList(&ReadFcb->DataListHead); + Current = CONTAINING_RECORD(CurrentEntry, NPFS_PIPE_DATA, ListEntry); - /* Truncate the message if the receive buffer is too small */ - CopyLength = RtlMin(Current->Size, Length); - RtlCopyMemory(Buffer, Current->Data, CopyLength); - Information = CopyLength; + DPRINT("Took pipe data at %p off the queue\n", Current); - Current->Offset += CopyLength; + /* Truncate the message if the receive buffer is too small */ + CopyLength = RtlMin(Current->Size, Length); + RtlCopyMemory(Buffer, Current->Data, CopyLength); + Information = CopyLength; - CurrentEntry = CurrentEntry->Flink; + Current->Offset += CopyLength; + NpfsFreePipeData(Current); } - } - + if (Information > 0) + { + break; + } + } + } + /* reset ReaderEvent */ KeReleaseSpinLock(&ReadFcb->DataListLock, OldIrql); - /* reset ReaderEvent */ - KeResetEvent(&Fcb->ReadEvent); done: Irp->IoStatus.Status = Status; @@ -275,10 +283,12 @@ NpfsWrite(PDEVICE_OBJECT DeviceObject, KeAcquireSpinLock(&Fcb->DataListLock, &OldIrql); InsertTailList(&Fcb->DataListHead, &PipeData->ListEntry); - KeReleaseSpinLock(&Fcb->DataListLock, OldIrql); /* signal the readers ReadEvent */ - KeSetEvent(&Fcb->OtherSide->ConnectEvent, IO_NO_INCREMENT, FALSE); + KeSetEvent(&Fcb->OtherSide->ReadEvent, IO_NO_INCREMENT, FALSE); + + KeReleaseSpinLock(&Fcb->DataListLock, OldIrql); + } else { -- 2.17.1