1 files changed, 58 insertions, 0 deletions
diff --git a/contrib/llvm-project/lldb/source/Host/posix/LockFilePosix.cpp b/contrib/llvm-project/lldb/source/Host/posix/LockFilePosix.cpp
new file mode 100644
index 000000000000..cb9ca5c29e5f
--- /dev/null
+++ b/contrib/llvm-project/lldb/source/Host/posix/LockFilePosix.cpp
@@ -0,0 +1,58 @@
+//===-- LockFilePosix.cpp -------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Host/posix/LockFilePosix.h"
+
+#include "llvm/Support/Errno.h"
+
+#include <fcntl.h>
+#include <unistd.h>
+
+using namespace lldb;
+using namespace lldb_private;
+
+static Status 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();
+
+  Status error;
+  if (llvm::sys::RetryAfterSignal(-1, ::fcntl, fd, cmd, &fl) == -1)
+    error.SetErrorToErrno();
+
+  return error;
+}
+
+LockFilePosix::LockFilePosix(int fd) : LockFileBase(fd) {}
+
+LockFilePosix::~LockFilePosix() { Unlock(); }
+
+Status LockFilePosix::DoWriteLock(const uint64_t start, const uint64_t len) {
+  return fileLock(m_fd, F_SETLKW, F_WRLCK, start, len);
+}
+
+Status LockFilePosix::DoTryWriteLock(const uint64_t start, const uint64_t len) {
+  return fileLock(m_fd, F_SETLK, F_WRLCK, start, len);
+}
+
+Status LockFilePosix::DoReadLock(const uint64_t start, const uint64_t len) {
+  return fileLock(m_fd, F_SETLKW, F_RDLCK, start, len);
+}
+
+Status LockFilePosix::DoTryReadLock(const uint64_t start, const uint64_t len) {
+  return fileLock(m_fd, F_SETLK, F_RDLCK, start, len);
+}
+
+Status LockFilePosix::DoUnlock() {
+  return fileLock(m_fd, F_SETLK, F_UNLCK, m_start, m_len);
+}