1 //===-- LockFilePosix.cpp ---------------------------------------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 #include "lldb/Host/posix/LockFilePosix.h"
11 #include "llvm/Support/Errno.h"
17 using namespace lldb_private;
21 Status fileLock(int fd, int cmd, int lock_type, const uint64_t start,
25 fl.l_type = lock_type;
26 fl.l_whence = SEEK_SET;
29 fl.l_pid = ::getpid();
32 if (llvm::sys::RetryAfterSignal(-1, ::fcntl, fd, cmd, &fl) == -1)
33 error.SetErrorToErrno();
40 LockFilePosix::LockFilePosix(int fd) : LockFileBase(fd) {}
42 LockFilePosix::~LockFilePosix() { Unlock(); }
44 Status LockFilePosix::DoWriteLock(const uint64_t start, const uint64_t len) {
45 return fileLock(m_fd, F_SETLKW, F_WRLCK, start, len);
48 Status LockFilePosix::DoTryWriteLock(const uint64_t start, const uint64_t len) {
49 return fileLock(m_fd, F_SETLK, F_WRLCK, start, len);
52 Status LockFilePosix::DoReadLock(const uint64_t start, const uint64_t len) {
53 return fileLock(m_fd, F_SETLKW, F_RDLCK, start, len);
56 Status LockFilePosix::DoTryReadLock(const uint64_t start, const uint64_t len) {
57 return fileLock(m_fd, F_SETLK, F_RDLCK, start, len);
60 Status LockFilePosix::DoUnlock() {
61 return fileLock(m_fd, F_SETLK, F_UNLCK, m_start, m_len);