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-rw-r--r--src/VBox/Runtime/common/vfs/vfsstdpipe.cpp317
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diff --git a/src/VBox/Runtime/common/vfs/vfsstdpipe.cpp b/src/VBox/Runtime/common/vfs/vfsstdpipe.cpp
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+/* $Id: vfsstdpipe.cpp $ */
+/** @file
+ * IPRT - Virtual File System, Standard Pipe I/O stream Implementation.
+ */
+
+/*
+ * Copyright (C) 2010-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+* Header Files *
+*********************************************************************************************************************************/
+#include <iprt/vfs.h>
+#include <iprt/vfslowlevel.h>
+
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/file.h>
+#include <iprt/pipe.h>
+#include <iprt/poll.h>
+
+
+/*********************************************************************************************************************************
+* Structures and Typedefs *
+*********************************************************************************************************************************/
+/**
+ * Private data of a standard pipe.
+ */
+typedef struct RTVFSSTDPIPE
+{
+ /** The pipe handle. */
+ RTPIPE hPipe;
+ /** Whether to leave the handle open when the VFS handle is closed. */
+ bool fLeaveOpen;
+ /** Set if primarily read, clear if write. */
+ bool fReadPipe;
+ /** Fake stream position. */
+ uint64_t offFakePos;
+} RTVFSSTDPIPE;
+/** Pointer to the private data of a standard pipe. */
+typedef RTVFSSTDPIPE *PRTVFSSTDPIPE;
+
+
+/**
+ * @interface_method_impl{RTVFSOBJOPS,pfnClose}
+ */
+static DECLCALLBACK(int) rtVfsStdPipe_Close(void *pvThis)
+{
+ PRTVFSSTDPIPE pThis = (PRTVFSSTDPIPE)pvThis;
+
+ int rc;
+ if (!pThis->fLeaveOpen)
+ rc = RTPipeClose(pThis->hPipe);
+ else
+ rc = VINF_SUCCESS;
+ pThis->hPipe = NIL_RTPIPE;
+
+ return rc;
+}
+
+
+/**
+ * @interface_method_impl{RTVFSOBJOPS,pfnQueryInfo}
+ */
+static DECLCALLBACK(int) rtVfsStdPipe_QueryInfo(void *pvThis, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr)
+{
+ PRTVFSSTDPIPE pThis = (PRTVFSSTDPIPE)pvThis;
+ return RTPipeQueryInfo(pThis->hPipe, pObjInfo, enmAddAttr);
+}
+
+
+/**
+ * @interface_method_impl{RTVFSIOSTREAMOPS,pfnRead}
+ */
+static DECLCALLBACK(int) rtVfsStdPipe_Read(void *pvThis, RTFOFF off, PCRTSGBUF pSgBuf, bool fBlocking, size_t *pcbRead)
+{
+ PRTVFSSTDPIPE pThis = (PRTVFSSTDPIPE)pvThis;
+ int rc;
+ AssertReturn(off < 0 || pThis->offFakePos == (uint64_t)off, VERR_SEEK_ON_DEVICE);
+
+ NOREF(fBlocking);
+ if (pSgBuf->cSegs == 1)
+ {
+ if (fBlocking)
+ rc = RTPipeReadBlocking(pThis->hPipe, pSgBuf->paSegs[0].pvSeg, pSgBuf->paSegs[0].cbSeg, pcbRead);
+ else
+ rc = RTPipeRead( pThis->hPipe, pSgBuf->paSegs[0].pvSeg, pSgBuf->paSegs[0].cbSeg, pcbRead);
+ if (RT_SUCCESS(rc))
+ pThis->offFakePos += pcbRead ? *pcbRead : pSgBuf->paSegs[0].cbSeg;
+ }
+ else
+ {
+ size_t cbSeg = 0;
+ size_t cbRead = 0;
+ size_t cbReadSeg = 0;
+ size_t *pcbReadSeg = pcbRead ? &cbReadSeg : NULL;
+ rc = VINF_SUCCESS;
+
+ for (uint32_t iSeg = 0; iSeg < pSgBuf->cSegs; iSeg++)
+ {
+ void *pvSeg = pSgBuf->paSegs[iSeg].pvSeg;
+ cbSeg = pSgBuf->paSegs[iSeg].cbSeg;
+
+ cbReadSeg = cbSeg;
+ if (fBlocking)
+ rc = RTPipeReadBlocking(pThis->hPipe, pvSeg, cbSeg, pcbReadSeg);
+ else
+ rc = RTPipeRead( pThis->hPipe, pvSeg, cbSeg, pcbReadSeg);
+ if (RT_FAILURE(rc))
+ break;
+ pThis->offFakePos += pcbRead ? cbReadSeg : cbSeg;
+ cbRead += cbReadSeg;
+ if (rc != VINF_SUCCESS)
+ break;
+ AssertBreakStmt(!pcbRead || cbReadSeg == cbSeg, rc = VINF_TRY_AGAIN);
+ }
+
+ if (pcbRead)
+ *pcbRead = cbRead;
+ }
+
+ return rc;
+}
+
+
+/**
+ * @interface_method_impl{RTVFSIOSTREAMOPS,pfnWrite}
+ */
+static DECLCALLBACK(int) rtVfsStdPipe_Write(void *pvThis, RTFOFF off, PCRTSGBUF pSgBuf, bool fBlocking, size_t *pcbWritten)
+{
+ PRTVFSSTDPIPE pThis = (PRTVFSSTDPIPE)pvThis;
+ int rc;
+ AssertReturn(off < 0 || pThis->offFakePos == (uint64_t)off, VERR_SEEK_ON_DEVICE);
+
+ if (pSgBuf->cSegs == 1)
+ {
+ if (fBlocking)
+ rc = RTPipeWriteBlocking(pThis->hPipe, pSgBuf->paSegs[0].pvSeg, pSgBuf->paSegs[0].cbSeg, pcbWritten);
+ else
+ rc = RTPipeWrite( pThis->hPipe, pSgBuf->paSegs[0].pvSeg, pSgBuf->paSegs[0].cbSeg, pcbWritten);
+ if (RT_SUCCESS(rc))
+ pThis->offFakePos += pcbWritten ? *pcbWritten : pSgBuf->paSegs[0].cbSeg;
+ }
+ else
+ {
+ size_t cbWritten = 0;
+ size_t cbWrittenSeg;
+ size_t *pcbWrittenSeg = pcbWritten ? &cbWrittenSeg : NULL;
+ rc = VINF_SUCCESS;
+
+ for (uint32_t iSeg = 0; iSeg < pSgBuf->cSegs; iSeg++)
+ {
+ void *pvSeg = pSgBuf->paSegs[iSeg].pvSeg;
+ size_t cbSeg = pSgBuf->paSegs[iSeg].cbSeg;
+
+ cbWrittenSeg = 0;
+ if (fBlocking)
+ rc = RTPipeWriteBlocking(pThis->hPipe, pvSeg, cbSeg, pcbWrittenSeg);
+ else
+ rc = RTPipeWrite( pThis->hPipe, pvSeg, cbSeg, pcbWrittenSeg);
+ if (RT_FAILURE(rc))
+ break;
+ pThis->offFakePos += pcbWritten ? cbWrittenSeg : cbSeg;
+ if (pcbWritten)
+ {
+ cbWritten += cbWrittenSeg;
+ if (rc != VINF_SUCCESS)
+ break;
+ AssertStmt(cbWrittenSeg == cbSeg, rc = VINF_TRY_AGAIN);
+ }
+ else
+ AssertBreak(rc == VINF_SUCCESS);
+ }
+
+ if (pcbWritten)
+ *pcbWritten = cbWritten;
+ }
+
+ return rc;
+}
+
+
+/**
+ * @interface_method_impl{RTVFSIOSTREAMOPS,pfnFlush}
+ */
+static DECLCALLBACK(int) rtVfsStdPipe_Flush(void *pvThis)
+{
+ PRTVFSSTDPIPE pThis = (PRTVFSSTDPIPE)pvThis;
+ return RTPipeFlush(pThis->hPipe);
+}
+
+
+/**
+ * @interface_method_impl{RTVFSIOSTREAMOPS,pfnPollOne}
+ */
+static DECLCALLBACK(int) rtVfsStdPipe_PollOne(void *pvThis, uint32_t fEvents, RTMSINTERVAL cMillies, bool fIntr,
+ uint32_t *pfRetEvents)
+{
+ PRTVFSSTDPIPE pThis = (PRTVFSSTDPIPE)pvThis;
+ uint32_t const fPossibleEvt = pThis->fReadPipe ? RTPOLL_EVT_READ : RTPOLL_EVT_WRITE;
+
+ int rc = RTPipeSelectOne(pThis->hPipe, cMillies);
+ if (RT_SUCCESS(rc))
+ {
+ if (fEvents & fPossibleEvt)
+ *pfRetEvents = fPossibleEvt;
+ else
+ rc = RTVfsUtilDummyPollOne(fEvents, cMillies, fIntr, pfRetEvents);
+ }
+ else if ( rc != VERR_TIMEOUT
+ && rc != VERR_INTERRUPTED
+ && rc != VERR_TRY_AGAIN /* paranoia */)
+ {
+ *pfRetEvents = RTPOLL_EVT_ERROR;
+ rc = VINF_SUCCESS;
+ }
+
+ return rc;
+}
+
+
+/**
+ * @interface_method_impl{RTVFSIOSTREAMOPS,pfnTell}
+ */
+static DECLCALLBACK(int) rtVfsStdPipe_Tell(void *pvThis, PRTFOFF poffActual)
+{
+ PRTVFSSTDPIPE pThis = (PRTVFSSTDPIPE)pvThis;
+ *poffActual = pThis->offFakePos;
+ return VINF_SUCCESS;
+}
+
+
+/**
+ * Standard pipe operations.
+ */
+DECL_HIDDEN_CONST(const RTVFSIOSTREAMOPS) g_rtVfsStdPipeOps =
+{
+ { /* Obj */
+ RTVFSOBJOPS_VERSION,
+ RTVFSOBJTYPE_IO_STREAM,
+ "StdFile",
+ rtVfsStdPipe_Close,
+ rtVfsStdPipe_QueryInfo,
+ RTVFSOBJOPS_VERSION
+ },
+ RTVFSIOSTREAMOPS_VERSION,
+ 0,
+ rtVfsStdPipe_Read,
+ rtVfsStdPipe_Write,
+ rtVfsStdPipe_Flush,
+ rtVfsStdPipe_PollOne,
+ rtVfsStdPipe_Tell,
+ NULL /*rtVfsStdPipe_Skip*/,
+ NULL /*ZeroFill*/,
+ RTVFSIOSTREAMOPS_VERSION,
+};
+
+
+/**
+ * Internal worker for RTVfsIosFromRTPipe and later some create API.
+ *
+ * @returns IRPT status code.
+ * @param hPipe The IPRT file handle.
+ * @param fOpen The RTFILE_O_XXX flags.
+ * @param fLeaveOpen Whether to leave it open or close it.
+ * @param phVfsFile Where to return the handle.
+ */
+static int rtVfsFileFromRTPipe(RTPIPE hPipe, uint64_t fOpen, bool fLeaveOpen, PRTVFSIOSTREAM phVfsIos)
+{
+ PRTVFSSTDPIPE pThis;
+ RTVFSIOSTREAM hVfsIos;
+ int rc = RTVfsNewIoStream(&g_rtVfsStdPipeOps, sizeof(RTVFSSTDPIPE), fOpen, NIL_RTVFS, NIL_RTVFSLOCK,
+ &hVfsIos, (void **)&pThis);
+ if (RT_FAILURE(rc))
+ return rc;
+
+ pThis->hPipe = hPipe;
+ pThis->fLeaveOpen = fLeaveOpen;
+ *phVfsIos = hVfsIos;
+ return VINF_SUCCESS;
+}
+
+
+RTDECL(int) RTVfsIoStrmFromRTPipe(RTPIPE hPipe, bool fLeaveOpen, PRTVFSIOSTREAM phVfsIos)
+{
+ /*
+ * Check the handle validity and read/write mode, then create a stream for it.
+ */
+ RTFSOBJINFO ObjInfo;
+ int rc = RTPipeQueryInfo(hPipe, &ObjInfo, RTFSOBJATTRADD_NOTHING);
+ if (RT_SUCCESS(rc))
+ rc = rtVfsFileFromRTPipe(hPipe,
+ ObjInfo.Attr.fMode & RTFS_DOS_READONLY ? RTFILE_O_READ : RTFILE_O_WRITE,
+ fLeaveOpen, phVfsIos);
+ return rc;
+}
+
+/** @todo Create pipe API? */
+
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