/* $Id: DrvRawFile.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */ /** @file * VBox stream drivers - Raw file output. */ /* * Copyright (C) 2006-2020 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. */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #define LOG_GROUP LOG_GROUP_DEFAULT #include #include #include #include #include #include #include #include #include #include "VBoxDD.h" /********************************************************************************************************************************* * Defined Constants And Macros * *********************************************************************************************************************************/ /********************************************************************************************************************************* * Structures and Typedefs * *********************************************************************************************************************************/ /** * Raw file output driver instance data. * * @implements PDMISTREAM */ typedef struct DRVRAWFILE { /** The stream interface. */ PDMISTREAM IStream; /** Pointer to the driver instance. */ PPDMDRVINS pDrvIns; /** Pointer to the file name. (Freed by MM) */ char *pszLocation; /** File handle to write the data to. */ RTFILE hOutputFile; /** Event semaphore for the poll interface. */ RTSEMEVENT hSemEvtPoll; } DRVRAWFILE, *PDRVRAWFILE; /* -=-=-=-=- PDMISTREAM -=-=-=-=- */ /** @interface_method_impl{PDMISTREAM,pfnPoll} */ static DECLCALLBACK(int) drvRawFilePoll(PPDMISTREAM pInterface, uint32_t fEvts, uint32_t *pfEvts, RTMSINTERVAL cMillies) { PDRVRAWFILE pThis = RT_FROM_MEMBER(pInterface, DRVRAWFILE, IStream); Assert(!(fEvts & RTPOLL_EVT_READ)); /* Reading is not supported here. */ /* Writing is always possible. */ if (fEvts & RTPOLL_EVT_WRITE) { *pfEvts = RTPOLL_EVT_WRITE; return VINF_SUCCESS; } return RTSemEventWait(pThis->hSemEvtPoll, cMillies); } /** @interface_method_impl{PDMISTREAM,pfnPollInterrupt} */ static DECLCALLBACK(int) drvRawFilePollInterrupt(PPDMISTREAM pInterface) { PDRVRAWFILE pThis = RT_FROM_MEMBER(pInterface, DRVRAWFILE, IStream); return RTSemEventSignal(pThis->hSemEvtPoll); } /** @interface_method_impl{PDMISTREAM,pfnWrite} */ static DECLCALLBACK(int) drvRawFileWrite(PPDMISTREAM pInterface, const void *pvBuf, size_t *pcbWrite) { int rc = VINF_SUCCESS; PDRVRAWFILE pThis = RT_FROM_MEMBER(pInterface, DRVRAWFILE, IStream); LogFlow(("%s: pvBuf=%p *pcbWrite=%#x (%s)\n", __FUNCTION__, pvBuf, *pcbWrite, pThis->pszLocation)); Assert(pvBuf); if (pThis->hOutputFile != NIL_RTFILE) { size_t cbWritten; rc = RTFileWrite(pThis->hOutputFile, pvBuf, *pcbWrite, &cbWritten); #if 0 /* don't flush here, takes too long and we will loose characters */ if (RT_SUCCESS(rc)) RTFileFlush(pThis->hOutputFile); #endif *pcbWrite = cbWritten; } LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc)); return rc; } /* -=-=-=-=- PDMIBASE -=-=-=-=- */ /** * @interface_method_impl{PDMIBASE,pfnQueryInterface} */ static DECLCALLBACK(void *) drvRawFileQueryInterface(PPDMIBASE pInterface, const char *pszIID) { PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface); PDRVRAWFILE pThis = PDMINS_2_DATA(pDrvIns, PDRVRAWFILE); PDMIBASE_RETURN_INTERFACE(pszIID, PDMIBASE, &pDrvIns->IBase); PDMIBASE_RETURN_INTERFACE(pszIID, PDMISTREAM, &pThis->IStream); return NULL; } /* -=-=-=-=- PDMDRVREG -=-=-=-=- */ /** * Power off a raw output stream driver instance. * * This does most of the destruction work, to avoid ordering dependencies. * * @param pDrvIns The driver instance data. */ static DECLCALLBACK(void) drvRawFilePowerOff(PPDMDRVINS pDrvIns) { PDRVRAWFILE pThis = PDMINS_2_DATA(pDrvIns, PDRVRAWFILE); LogFlow(("%s: %s\n", __FUNCTION__, pThis->pszLocation)); RTFileClose(pThis->hOutputFile); pThis->hOutputFile = NIL_RTFILE; } /** * Destruct a raw output stream driver instance. * * Most VM resources are freed by the VM. This callback is provided so that * any non-VM resources can be freed correctly. * * @param pDrvIns The driver instance data. */ static DECLCALLBACK(void) drvRawFileDestruct(PPDMDRVINS pDrvIns) { PDRVRAWFILE pThis = PDMINS_2_DATA(pDrvIns, PDRVRAWFILE); LogFlow(("%s: %s\n", __FUNCTION__, pThis->pszLocation)); PDMDRV_CHECK_VERSIONS_RETURN_VOID(pDrvIns); if (pThis->pszLocation) MMR3HeapFree(pThis->pszLocation); if (pThis->hOutputFile != NIL_RTFILE) { RTFileClose(pThis->hOutputFile); pThis->hOutputFile = NIL_RTFILE; } if (pThis->hSemEvtPoll != NIL_RTSEMEVENT) { RTSemEventDestroy(pThis->hSemEvtPoll); pThis->hSemEvtPoll = NIL_RTSEMEVENT; } } /** * Construct a raw output stream driver instance. * * @copydoc FNPDMDRVCONSTRUCT */ static DECLCALLBACK(int) drvRawFileConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfg, uint32_t fFlags) { RT_NOREF(fFlags); PDMDRV_CHECK_VERSIONS_RETURN(pDrvIns); PDRVRAWFILE pThis = PDMINS_2_DATA(pDrvIns, PDRVRAWFILE); /* * Init the static parts. */ pThis->pDrvIns = pDrvIns; pThis->pszLocation = NULL; pThis->hOutputFile = NIL_RTFILE; /* IBase */ pDrvIns->IBase.pfnQueryInterface = drvRawFileQueryInterface; /* IStream */ pThis->IStream.pfnPoll = drvRawFilePoll; pThis->IStream.pfnPollInterrupt = drvRawFilePollInterrupt; pThis->IStream.pfnRead = NULL; pThis->IStream.pfnWrite = drvRawFileWrite; /* * Read the configuration. */ if (!CFGMR3AreValuesValid(pCfg, "Location\0")) AssertFailedReturn(VERR_PDM_DRVINS_UNKNOWN_CFG_VALUES); int rc = CFGMR3QueryStringAlloc(pCfg, "Location", &pThis->pszLocation); if (RT_FAILURE(rc)) AssertMsgFailedReturn(("Configuration error: query \"Location\" resulted in %Rrc.\n", rc), rc); rc = RTSemEventCreate(&pThis->hSemEvtPoll); AssertRCReturn(rc, rc); /* * Open the raw file. */ rc = RTFileOpen(&pThis->hOutputFile, pThis->pszLocation, RTFILE_O_WRITE | RTFILE_O_CREATE_REPLACE | RTFILE_O_DENY_NONE); if (RT_FAILURE(rc)) { LogRel(("RawFile%d: CreateFile failed rc=%Rrc\n", pDrvIns->iInstance, rc)); return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS, N_("RawFile#%d failed to create the raw output file %s"), pDrvIns->iInstance, pThis->pszLocation); } LogFlow(("drvRawFileConstruct: location %s\n", pThis->pszLocation)); LogRel(("RawFile#%u: location %s\n", pDrvIns->iInstance, pThis->pszLocation)); return VINF_SUCCESS; } /** * Raw file driver registration record. */ const PDMDRVREG g_DrvRawFile = { /* u32Version */ PDM_DRVREG_VERSION, /* szName */ "RawFile", /* szRCMod */ "", /* szR0Mod */ "", /* pszDescription */ "RawFile stream driver.", /* fFlags */ PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT, /* fClass. */ PDM_DRVREG_CLASS_STREAM, /* cMaxInstances */ ~0U, /* cbInstance */ sizeof(DRVRAWFILE), /* pfnConstruct */ drvRawFileConstruct, /* pfnDestruct */ drvRawFileDestruct, /* pfnRelocate */ NULL, /* pfnIOCtl */ NULL, /* pfnPowerOn */ NULL, /* pfnReset */ NULL, /* pfnSuspend */ NULL, /* pfnResume */ NULL, /* pfnAttach */ NULL, /* pfnDetach */ NULL, /* pfnPowerOff */ drvRawFilePowerOff, /* pfnSoftReset */ NULL, /* u32EndVersion */ PDM_DRVREG_VERSION };