| 1 | /* $Id: fileio-at-posix.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - File I/O, RTFileReadAt and RTFileWriteAt, posix.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2020 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include <errno.h>
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| 32 | #include <sys/types.h>
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| 33 | #include <unistd.h>
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| 34 |
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| 35 | #include "internal/iprt.h"
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| 36 | #include <iprt/file.h>
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| 37 |
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| 38 | #include <iprt/err.h>
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| 39 | #include <iprt/log.h>
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| 40 |
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| 41 |
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| 42 |
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| 43 | RTDECL(int) RTFileReadAt(RTFILE hFile, RTFOFF off, void *pvBuf, size_t cbToRead, size_t *pcbRead)
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| 44 | {
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| 45 | ssize_t cbRead = pread(RTFileToNative(hFile), pvBuf, cbToRead, off);
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| 46 | if (cbRead >= 0)
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| 47 | {
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| 48 | if (pcbRead)
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| 49 | /* caller can handle partial read. */
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| 50 | *pcbRead = cbRead;
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| 51 | else
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| 52 | {
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| 53 | /* Caller expects all to be read. */
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| 54 | while ((ssize_t)cbToRead > cbRead)
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| 55 | {
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| 56 | ssize_t cbReadPart = pread(RTFileToNative(hFile), (char*)pvBuf + cbRead, cbToRead - cbRead, off + cbRead);
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| 57 | if (cbReadPart <= 0)
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| 58 | {
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| 59 | if (cbReadPart == 0)
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| 60 | return VERR_EOF;
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| 61 | return RTErrConvertFromErrno(errno);
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| 62 | }
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| 63 | cbRead += cbReadPart;
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| 64 | }
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| 65 | }
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| 66 | return VINF_SUCCESS;
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| 67 | }
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| 68 |
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| 69 | return RTErrConvertFromErrno(errno);
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| 70 | }
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| 71 |
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| 72 |
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| 73 | RTDECL(int) RTFileWriteAt(RTFILE hFile, RTFOFF off, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten)
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| 74 | {
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| 75 | ssize_t cbWritten = pwrite(RTFileToNative(hFile), pvBuf, cbToWrite, off);
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| 76 | if (cbWritten >= 0)
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| 77 | {
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| 78 | if (pcbWritten)
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| 79 | /* caller can handle partial write. */
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| 80 | *pcbWritten = cbWritten;
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| 81 | else
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| 82 | {
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| 83 | /* Caller expects all to be write. */
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| 84 | while ((ssize_t)cbToWrite > cbWritten)
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| 85 | {
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| 86 | ssize_t cbWrittenPart = pwrite(RTFileToNative(hFile), (const char *)pvBuf + cbWritten, cbToWrite - cbWritten,
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| 87 | off + cbWritten);
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| 88 | if (cbWrittenPart < 0)
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| 89 | return cbWrittenPart < 0 ? RTErrConvertFromErrno(errno) : VERR_TRY_AGAIN;
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| 90 | cbWritten += cbWrittenPart;
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| 91 | }
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| 92 | }
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| 93 | return VINF_SUCCESS;
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| 94 | }
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| 95 | return RTErrConvertFromErrno(errno);
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| 96 | }
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| 97 |
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