VirtualBox

source: vbox/trunk/src/VBox/Runtime/r3/posix/fileio-at-posix.cpp@ 77235

Last change on this file since 77235 was 77235, checked in by vboxsync, 6 years ago

IPRT: Implemented RTFileSgWriteAt and RTfileSgReadAt for linux and freebsd. Clearified RTFileWriteAt and RTFileSgWriteAt specs wrt RTFILE_O_APPEND. bugref:9172

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 3.4 KB
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1/* $Id: fileio-at-posix.cpp 77235 2019-02-09 18:30:14Z vboxsync $ */
2/** @file
3 * IPRT - File I/O, RTFileReadAt and RTFileWriteAt, posix.
4 */
5
6/*
7 * Copyright (C) 2006-2019 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 */
26
27
28/*********************************************************************************************************************************
29* Header Files *
30*********************************************************************************************************************************/
31#include <errno.h>
32#include <sys/types.h>
33#include <unistd.h>
34
35#include "internal/iprt.h"
36#include <iprt/file.h>
37
38#include <iprt/err.h>
39#include <iprt/log.h>
40
41
42
43RTDECL(int) RTFileReadAt(RTFILE hFile, RTFOFF off, void *pvBuf, size_t cbToRead, size_t *pcbRead)
44{
45 ssize_t cbRead = pread(RTFileToNative(hFile), pvBuf, cbToRead, off);
46 if (cbRead >= 0)
47 {
48 if (pcbRead)
49 /* caller can handle partial read. */
50 *pcbRead = cbRead;
51 else
52 {
53 /* Caller expects all to be read. */
54 while ((ssize_t)cbToRead > cbRead)
55 {
56 ssize_t cbReadPart = pread(RTFileToNative(hFile), (char*)pvBuf + cbRead, cbToRead - cbRead, off + cbRead);
57 if (cbReadPart <= 0)
58 {
59 if (cbReadPart == 0)
60 return VERR_EOF;
61 return RTErrConvertFromErrno(errno);
62 }
63 cbRead += cbReadPart;
64 }
65 }
66 return VINF_SUCCESS;
67 }
68
69 return RTErrConvertFromErrno(errno);
70}
71
72
73RTDECL(int) RTFileWriteAt(RTFILE hFile, RTFOFF off, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten)
74{
75 ssize_t cbWritten = pwrite(RTFileToNative(hFile), pvBuf, cbToWrite, off);
76 if (cbWritten >= 0)
77 {
78 if (pcbWritten)
79 /* caller can handle partial write. */
80 *pcbWritten = cbWritten;
81 else
82 {
83 /* Caller expects all to be write. */
84 while ((ssize_t)cbToWrite > cbWritten)
85 {
86 ssize_t cbWrittenPart = pwrite(RTFileToNative(hFile), (const char *)pvBuf + cbWritten, cbToWrite - cbWritten,
87 off + cbWritten);
88 if (cbWrittenPart < 0)
89 return cbWrittenPart < 0 ? RTErrConvertFromErrno(errno) : VERR_TRY_AGAIN;
90 cbWritten += cbWrittenPart;
91 }
92 }
93 return VINF_SUCCESS;
94 }
95 return RTErrConvertFromErrno(errno);
96}
97
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