diff options
Diffstat (limited to 'src/VBox/Runtime/r3/darwin/filelock-darwin.cpp')
| -rw-r--r-- | src/VBox/Runtime/r3/darwin/filelock-darwin.cpp | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r3/darwin/filelock-darwin.cpp b/src/VBox/Runtime/r3/darwin/filelock-darwin.cpp new file mode 100644 index 00000000..16d7137d --- /dev/null +++ b/src/VBox/Runtime/r3/darwin/filelock-darwin.cpp @@ -0,0 +1,178 @@ +/* $Id: filelock-darwin.cpp $ */ +/** @file + * IPRT - File Locking, POSIX. + */ + +/* + * Copyright (C) 2006-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included + * in the VirtualBox 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. + * + * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#define LOG_GROUP RTLOGGROUP_FILE + +#include <errno.h> +#include <sys/types.h> +#include <sys/ioctl.h> +#include <sys/fcntl.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 == ENOTSUP) + { + /* + * This is really bad hack for getting VDIs to work somewhat + * safely on SMB mounts. + */ + /** @todo we need to keep track of these locks really. Anyone requiring to lock more + * than one part of a file will have to fix this. */ + unsigned f = 0; + Assert(RTFILE_LOCK_WAIT); + if (fLock & RTFILE_LOCK_WAIT) + f |= LOCK_NB; + if (fLock & RTFILE_LOCK_WRITE) + f |= LOCK_EX; + else + f |= LOCK_SH; + if (!flock(RTFileToNative(hFile), f)) + return VINF_SUCCESS; + iErr = errno; + if (iErr == EWOULDBLOCK) + return VERR_FILE_LOCK_VIOLATION; + } + + 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; + + int iErr = errno; + if (iErr == ENOTSUP) + { + /* A SMB hack, see RTFileLock. */ + if (!flock(RTFileToNative(hFile), LOCK_UN)) + return VINF_SUCCESS; + } + + /** @todo check error codes for non existing lock. */ + if ( iErr == EAGAIN + || iErr == EACCES) + return VERR_FILE_LOCK_VIOLATION; + + return RTErrConvertFromErrno(iErr); +} + |