| //===-- 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); |
| } |