1 files changed, 77 insertions, 0 deletions
diff --git a/source/Host/posix/LockFilePosix.cpp b/source/Host/posix/LockFilePosix.cpp
new file mode 100644
index 0000000..e52b648
--- /dev/null
+++ b/source/Host/posix/LockFilePosix.cpp
@@ -0,0 +1,77 @@
+//===-- LockFilePosix.cpp ---------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Host/posix/LockFilePosix.h"
+
+#include <fcntl.h>
+
+using namespace lldb;
+using namespace lldb_private;
+
+namespace
+{
+
+Error fileLock (int fd, int cmd, int lock_type, const uint64_t start, const uint64_t len)
+{
+    struct flock fl;
+
+    fl.l_type   = lock_type;
+    fl.l_whence = SEEK_SET;
+    fl.l_start  = start;
+    fl.l_len    = len;
+    fl.l_pid    = ::getpid ();
+
+    Error error;
+    if (::fcntl (fd, cmd, &fl) == -1)
+        error.SetErrorToErrno ();
+
+    return error;
+}
+
+}  // namespace
+
+LockFilePosix::LockFilePosix (int fd)
+    : LockFileBase (fd)
+{
+}
+
+LockFilePosix::~LockFilePosix ()
+{
+    Unlock ();
+}
+
+Error
+LockFilePosix::DoWriteLock (const uint64_t start, const uint64_t len)
+{
+    return fileLock (m_fd, F_SETLKW, F_WRLCK, start, len);
+}
+
+Error
+LockFilePosix::DoTryWriteLock (const uint64_t start, const uint64_t len)
+{
+    return fileLock (m_fd, F_SETLK, F_WRLCK, start, len);
+}
+
+Error
+LockFilePosix::DoReadLock (const uint64_t start, const uint64_t len)
+{
+    return fileLock (m_fd, F_SETLKW, F_RDLCK, start, len);
+}
+
+Error
+LockFilePosix::DoTryReadLock (const uint64_t start, const uint64_t len)
+{
+    return fileLock (m_fd, F_SETLK, F_RDLCK, start, len);
+}
+
+Error
+LockFilePosix::DoUnlock ()
+{
+    return fileLock (m_fd, F_SETLK, F_UNLCK, m_start, m_len);
+}