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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 03:01:46 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-06 03:01:46 +0000 |
commit | f8fe689a81f906d1b91bb3220acde2a4ecb14c5b (patch) | |
tree | 26484e9d7e2c67806c2d1760196ff01aaa858e8c /src/VBox/Runtime/r3/posix/filelock-posix.cpp | |
parent | Initial commit. (diff) | |
download | virtualbox-f8fe689a81f906d1b91bb3220acde2a4ecb14c5b.tar.xz virtualbox-f8fe689a81f906d1b91bb3220acde2a4ecb14c5b.zip |
Adding upstream version 6.0.4-dfsg.upstream/6.0.4-dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/VBox/Runtime/r3/posix/filelock-posix.cpp | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r3/posix/filelock-posix.cpp b/src/VBox/Runtime/r3/posix/filelock-posix.cpp new file mode 100644 index 00000000..7fd988dc --- /dev/null +++ b/src/VBox/Runtime/r3/posix/filelock-posix.cpp @@ -0,0 +1,138 @@ +/* $Id: filelock-posix.cpp $ */ +/** @file + * IPRT - File Locking, POSIX. + */ + +/* + * Copyright (C) 2006-2019 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE 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. + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#define LOG_GROUP RTLOGGROUP_FILE + +#include <errno.h> +#include <sys/types.h> +#include <sys/ioctl.h> +#include <fcntl.h> +#include <unistd.h> +#include <sys/time.h> + +#include <iprt/file.h> +#include <iprt/assert.h> +#include <iprt/string.h> +#include <iprt/err.h> +#include <iprt/log.h> +#include "internal/file.h" +#include "internal/fs.h" + + + + +RTR3DECL(int) RTFileLock(RTFILE hFile, unsigned fLock, int64_t offLock, uint64_t cbLock) +{ + Assert(offLock >= 0); + + /* Check arguments. */ + if (fLock & ~RTFILE_LOCK_MASK) + { + AssertMsgFailed(("Invalid fLock=%08X\n", fLock)); + return VERR_INVALID_PARAMETER; + } + + /* + * Validate offset. + */ + if ( sizeof(off_t) < sizeof(cbLock) + && ( (offLock >> 32) != 0 + || (cbLock >> 32) != 0 + || ((offLock + cbLock) >> 32) != 0)) + { + AssertMsgFailed(("64-bit file i/o not supported! offLock=%lld cbLock=%lld\n", offLock, cbLock)); + return VERR_NOT_SUPPORTED; + } + + /* Prepare flock structure. */ + struct flock fl; + Assert(RTFILE_LOCK_WRITE); + fl.l_type = (fLock & RTFILE_LOCK_WRITE) ? F_WRLCK : F_RDLCK; + fl.l_whence = SEEK_SET; + fl.l_start = (off_t)offLock; + fl.l_len = (off_t)cbLock; + fl.l_pid = 0; + + Assert(RTFILE_LOCK_WAIT); + if (fcntl(RTFileToNative(hFile), (fLock & RTFILE_LOCK_WAIT) ? F_SETLKW : F_SETLK, &fl) >= 0) + return VINF_SUCCESS; + + int iErr = errno; + if ( iErr == EAGAIN + || iErr == EACCES) + return VERR_FILE_LOCK_VIOLATION; + + return RTErrConvertFromErrno(iErr); +} + + +RTR3DECL(int) RTFileChangeLock(RTFILE hFile, unsigned fLock, int64_t offLock, uint64_t cbLock) +{ + /** @todo We never returns VERR_FILE_NOT_LOCKED for now. */ + return RTFileLock(hFile, fLock, offLock, cbLock); +} + + +RTR3DECL(int) RTFileUnlock(RTFILE hFile, int64_t offLock, uint64_t cbLock) +{ + Assert(offLock >= 0); + + /* + * Validate offset. + */ + if ( sizeof(off_t) < sizeof(cbLock) + && ( (offLock >> 32) != 0 + || (cbLock >> 32) != 0 + || ((offLock + cbLock) >> 32) != 0)) + { + AssertMsgFailed(("64-bit file i/o not supported! offLock=%lld cbLock=%lld\n", offLock, cbLock)); + return VERR_NOT_SUPPORTED; + } + + /* Prepare flock structure. */ + struct flock fl; + fl.l_type = F_UNLCK; + fl.l_whence = SEEK_SET; + fl.l_start = (off_t)offLock; + fl.l_len = (off_t)cbLock; + fl.l_pid = 0; + + if (fcntl(RTFileToNative(hFile), F_SETLK, &fl) >= 0) + return VINF_SUCCESS; + + /** @todo check error codes for non existing lock. */ + int iErr = errno; + if ( iErr == EAGAIN + || iErr == EACCES) + return VERR_FILE_LOCK_VIOLATION; + + return RTErrConvertFromErrno(iErr); +} + |