forked from OSchip/llvm-project
62 lines
1.6 KiB
C++
62 lines
1.6 KiB
C++
//===-- LockFilePosix.cpp ---------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Host/posix/LockFilePosix.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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namespace {
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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 (::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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} // namespace
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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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}
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