VirtualBox

source: vbox/trunk/src/VBox/Runtime/r3/posix/fileio-at-posix.cpp@ 103914

Last change on this file since 103914 was 98103, checked in by vboxsync, 2 years ago

Copyright year updates by scm.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 3.7 KB
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1/* $Id: fileio-at-posix.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2/** @file
3 * IPRT - File I/O, RTFileReadAt and RTFileWriteAt, posix.
4 */
5
6/*
7 * Copyright (C) 2006-2023 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * The contents of this file may alternatively be used under the terms
26 * of the Common Development and Distribution License Version 1.0
27 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28 * in the VirtualBox distribution, in which case the provisions of the
29 * CDDL are applicable instead of those of the GPL.
30 *
31 * You may elect to license modified versions of this file under the
32 * terms and conditions of either the GPL or the CDDL or both.
33 *
34 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35 */
36
37
38/*********************************************************************************************************************************
39* Header Files *
40*********************************************************************************************************************************/
41#include <errno.h>
42#include <sys/types.h>
43#include <unistd.h>
44
45#include "internal/iprt.h"
46#include <iprt/file.h>
47
48#include <iprt/err.h>
49#include <iprt/log.h>
50
51
52
53RTDECL(int) RTFileReadAt(RTFILE hFile, RTFOFF off, void *pvBuf, size_t cbToRead, size_t *pcbRead)
54{
55 ssize_t cbRead = pread(RTFileToNative(hFile), pvBuf, cbToRead, off);
56 if (cbRead >= 0)
57 {
58 if (pcbRead)
59 /* caller can handle partial read. */
60 *pcbRead = cbRead;
61 else
62 {
63 /* Caller expects all to be read. */
64 while ((ssize_t)cbToRead > cbRead)
65 {
66 ssize_t cbReadPart = pread(RTFileToNative(hFile), (char*)pvBuf + cbRead, cbToRead - cbRead, off + cbRead);
67 if (cbReadPart <= 0)
68 {
69 if (cbReadPart == 0)
70 return VERR_EOF;
71 return RTErrConvertFromErrno(errno);
72 }
73 cbRead += cbReadPart;
74 }
75 }
76 return VINF_SUCCESS;
77 }
78
79 return RTErrConvertFromErrno(errno);
80}
81
82
83RTDECL(int) RTFileWriteAt(RTFILE hFile, RTFOFF off, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten)
84{
85 ssize_t cbWritten = pwrite(RTFileToNative(hFile), pvBuf, cbToWrite, off);
86 if (cbWritten >= 0)
87 {
88 if (pcbWritten)
89 /* caller can handle partial write. */
90 *pcbWritten = cbWritten;
91 else
92 {
93 /* Caller expects all to be write. */
94 while ((ssize_t)cbToWrite > cbWritten)
95 {
96 ssize_t cbWrittenPart = pwrite(RTFileToNative(hFile), (const char *)pvBuf + cbWritten, cbToWrite - cbWritten,
97 off + cbWritten);
98 if (cbWrittenPart < 0)
99 return cbWrittenPart < 0 ? RTErrConvertFromErrno(errno) : VERR_TRY_AGAIN;
100 cbWritten += cbWrittenPart;
101 }
102 }
103 return VINF_SUCCESS;
104 }
105 return RTErrConvertFromErrno(errno);
106}
107
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