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fdcfd2816e
This API wraps flock(2) and also handles the file creation and deletion when the LockFile goes out of scope.
57 lines
973 B
C++
57 lines
973 B
C++
/*
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* Copyright (c) 2021, Peter Elliott <pelliott@ualberta.ca>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibCore/File.h>
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#include <LibCore/LockFile.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/file.h>
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#include <unistd.h>
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namespace Core {
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LockFile::LockFile(char const* filename, Type type)
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: m_filename(filename)
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{
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if (!Core::File::ensure_parent_directories(m_filename))
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return;
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m_fd = open(filename, O_RDONLY | O_CREAT, 0666);
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if (m_fd == -1) {
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m_errno = errno;
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return;
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}
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if (flock(m_fd, LOCK_NB | ((type == Type::Exclusive) ? LOCK_EX : LOCK_SH)) == -1) {
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m_errno = errno;
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close(m_fd);
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m_fd = -1;
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}
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}
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LockFile::~LockFile()
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{
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release();
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}
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bool LockFile::is_held() const
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{
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return m_fd != -1;
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}
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void LockFile::release()
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{
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if (m_fd == -1)
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return;
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unlink(m_filename);
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flock(m_fd, LOCK_NB | LOCK_UN);
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close(m_fd);
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m_fd = -1;
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}
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}
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