1 files changed, 168 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..0d92d6a5
--- /dev/null
+++ b/src/VBox/Runtime/r3/darwin/filelock-darwin.cpp
@@ -0,0 +1,168 @@
+/* $Id: filelock-darwin.cpp $ */
+/** @file
+ * IPRT - File Locking, POSIX.
+ */
+
+/*
+ * Copyright (C) 2006-2020 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 <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);
+}
+