| 1 | /* $Id: filelock-posix.cpp 62477 2016-07-22 18:27:37Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - File Locking, POSIX.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2016 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 | #define LOG_GROUP RTLOGGROUP_FILE
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| 32 |
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| 33 | #include <errno.h>
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| 34 | #include <sys/types.h>
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| 35 | #include <sys/ioctl.h>
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| 36 | #include <fcntl.h>
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| 37 | #include <unistd.h>
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| 38 | #include <sys/time.h>
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| 39 |
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| 40 | #include <iprt/file.h>
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| 41 | #include <iprt/assert.h>
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| 42 | #include <iprt/string.h>
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| 43 | #include <iprt/err.h>
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| 44 | #include <iprt/log.h>
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| 45 | #include "internal/file.h"
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| 46 | #include "internal/fs.h"
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| 47 |
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| 48 |
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| 49 |
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| 50 |
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| 51 | RTR3DECL(int) RTFileLock(RTFILE hFile, unsigned fLock, int64_t offLock, uint64_t cbLock)
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| 52 | {
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| 53 | Assert(offLock >= 0);
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| 54 |
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| 55 | /* Check arguments. */
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| 56 | if (fLock & ~RTFILE_LOCK_MASK)
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| 57 | {
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| 58 | AssertMsgFailed(("Invalid fLock=%08X\n", fLock));
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| 59 | return VERR_INVALID_PARAMETER;
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| 60 | }
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| 61 |
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| 62 | /*
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| 63 | * Validate offset.
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| 64 | */
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| 65 | if ( sizeof(off_t) < sizeof(cbLock)
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| 66 | && ( (offLock >> 32) != 0
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| 67 | || (cbLock >> 32) != 0
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| 68 | || ((offLock + cbLock) >> 32) != 0))
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| 69 | {
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| 70 | AssertMsgFailed(("64-bit file i/o not supported! offLock=%lld cbLock=%lld\n", offLock, cbLock));
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| 71 | return VERR_NOT_SUPPORTED;
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| 72 | }
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| 73 |
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| 74 | /* Prepare flock structure. */
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| 75 | struct flock fl;
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| 76 | Assert(RTFILE_LOCK_WRITE);
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| 77 | fl.l_type = (fLock & RTFILE_LOCK_WRITE) ? F_WRLCK : F_RDLCK;
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| 78 | fl.l_whence = SEEK_SET;
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| 79 | fl.l_start = (off_t)offLock;
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| 80 | fl.l_len = (off_t)cbLock;
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| 81 | fl.l_pid = 0;
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| 82 |
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| 83 | Assert(RTFILE_LOCK_WAIT);
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| 84 | if (fcntl(RTFileToNative(hFile), (fLock & RTFILE_LOCK_WAIT) ? F_SETLKW : F_SETLK, &fl) >= 0)
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| 85 | return VINF_SUCCESS;
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| 86 |
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| 87 | int iErr = errno;
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| 88 | if ( iErr == EAGAIN
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| 89 | || iErr == EACCES)
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| 90 | return VERR_FILE_LOCK_VIOLATION;
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| 91 |
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| 92 | return RTErrConvertFromErrno(iErr);
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| 93 | }
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| 94 |
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| 95 |
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| 96 | RTR3DECL(int) RTFileChangeLock(RTFILE hFile, unsigned fLock, int64_t offLock, uint64_t cbLock)
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| 97 | {
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| 98 | /** @todo We never returns VERR_FILE_NOT_LOCKED for now. */
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| 99 | return RTFileLock(hFile, fLock, offLock, cbLock);
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| 100 | }
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| 101 |
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| 102 |
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| 103 | RTR3DECL(int) RTFileUnlock(RTFILE hFile, int64_t offLock, uint64_t cbLock)
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| 104 | {
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| 105 | Assert(offLock >= 0);
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| 106 |
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| 107 | /*
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| 108 | * Validate offset.
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| 109 | */
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| 110 | if ( sizeof(off_t) < sizeof(cbLock)
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| 111 | && ( (offLock >> 32) != 0
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| 112 | || (cbLock >> 32) != 0
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| 113 | || ((offLock + cbLock) >> 32) != 0))
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| 114 | {
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| 115 | AssertMsgFailed(("64-bit file i/o not supported! offLock=%lld cbLock=%lld\n", offLock, cbLock));
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| 116 | return VERR_NOT_SUPPORTED;
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| 117 | }
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| 118 |
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| 119 | /* Prepare flock structure. */
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| 120 | struct flock fl;
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| 121 | fl.l_type = F_UNLCK;
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| 122 | fl.l_whence = SEEK_SET;
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| 123 | fl.l_start = (off_t)offLock;
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| 124 | fl.l_len = (off_t)cbLock;
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| 125 | fl.l_pid = 0;
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| 126 |
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| 127 | if (fcntl(RTFileToNative(hFile), F_SETLK, &fl) >= 0)
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| 128 | return VINF_SUCCESS;
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| 129 |
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| 130 | /* @todo check error codes for non existing lock. */
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| 131 | int iErr = errno;
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| 132 | if ( iErr == EAGAIN
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| 133 | || iErr == EACCES)
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| 134 | return VERR_FILE_LOCK_VIOLATION;
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| 135 |
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| 136 | return RTErrConvertFromErrno(iErr);
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| 137 | }
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| 138 |
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