Coverage Report

Created: 2022-01-18 06:27

/Users/buildslave/jenkins/workspace/coverage/llvm-project/lldb/source/Host/posix/LockFilePosix.cpp
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//===-- LockFilePosix.cpp -------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Host/posix/LockFilePosix.h"
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#include "llvm/Support/Errno.h"
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#include <fcntl.h>
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#include <unistd.h>
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using namespace lldb;
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using namespace lldb_private;
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static Status fileLock(int fd, int cmd, int lock_type, const uint64_t start,
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                       const uint64_t len) {
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  struct flock fl;
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  fl.l_type = lock_type;
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  fl.l_whence = SEEK_SET;
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  fl.l_start = start;
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  fl.l_len = len;
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  fl.l_pid = ::getpid();
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  Status error;
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  if (llvm::sys::RetryAfterSignal(-1, ::fcntl, fd, cmd, &fl) == -1)
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    error.SetErrorToErrno();
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  return error;
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}
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LockFilePosix::LockFilePosix(int fd) : LockFileBase(fd) {}
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LockFilePosix::~LockFilePosix() { Unlock(); }
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Status LockFilePosix::DoWriteLock(const uint64_t start, const uint64_t len) {
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  return fileLock(m_fd, F_SETLKW, F_WRLCK, start, len);
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}
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Status LockFilePosix::DoTryWriteLock(const uint64_t start, const uint64_t len) {
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  return fileLock(m_fd, F_SETLK, F_WRLCK, start, len);
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}
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Status LockFilePosix::DoReadLock(const uint64_t start, const uint64_t len) {
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  return fileLock(m_fd, F_SETLKW, F_RDLCK, start, len);
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}
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Status LockFilePosix::DoTryReadLock(const uint64_t start, const uint64_t len) {
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  return fileLock(m_fd, F_SETLK, F_RDLCK, start, len);
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}
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Status LockFilePosix::DoUnlock() {
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  return fileLock(m_fd, F_SETLK, F_UNLCK, m_start, m_len);
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}