summaryrefslogtreecommitdiffstats
path: root/src/VBox/Runtime/r3/darwin/filelock-darwin.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/VBox/Runtime/r3/darwin/filelock-darwin.cpp')
-rw-r--r--src/VBox/Runtime/r3/darwin/filelock-darwin.cpp178
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);
+}
+