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/* $Id: VBoxGuestR3LibLog.cpp $ */
/** @file
* VBoxGuestR3Lib - Ring-3 Support Library for VirtualBox guest additions, Logging.
*/
/*
* Copyright (C) 2007-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/err.h>
#include <iprt/mem.h>
#include <iprt/string.h>
#include "VBoxGuestR3LibInternal.h"
/**
* Write to the backdoor logger from ring 3 guest code.
*
* @returns IPRT status code.
*
* @param pch The string to log. Does not need to be terminated.
* @param cch The number of chars (bytes) to log.
*
* @remarks This currently does not accept more than 255 bytes of data at
* one time. It should probably be rewritten to use pass a pointer
* in the IOCtl.
*/
VBGLR3DECL(int) VbglR3WriteLog(const char *pch, size_t cch)
{
/*
* Quietly skip empty strings.
* (Happens in the RTLogBackdoorPrintf case.)
*/
int rc;
if (cch > 0)
{
if (RT_VALID_PTR(pch))
{
/*
* We need to repackage the string for ring-0.
*/
size_t cbMsg = VBGL_IOCTL_LOG_SIZE(cch);
PVBGLIOCLOG pMsg = (PVBGLIOCLOG)RTMemTmpAlloc(cbMsg);
if (pMsg)
{
VBGLREQHDR_INIT_EX(&pMsg->Hdr, VBGL_IOCTL_LOG_SIZE_IN(cch), VBGL_IOCTL_LOG_SIZE_OUT);
memcpy(pMsg->u.In.szMsg, pch, cch);
pMsg->u.In.szMsg[cch] = '\0';
rc = vbglR3DoIOCtl(VBGL_IOCTL_LOG(cch), &pMsg->Hdr, cbMsg);
RTMemTmpFree(pMsg);
}
else
rc = VERR_NO_TMP_MEMORY;
}
else
rc = VERR_INVALID_POINTER;
}
else
rc = VINF_SUCCESS;
return rc;
}
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