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/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qbs.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <cerrno>
#include <chrono>
#include <cstdio>
#include <cstring>
#include <iostream>
#include <string>
#include <thread>
#if defined(_WIN32) || defined(WIN32)
#include <io.h>
#include <sys/locking.h>
#else
#include <unistd.h>
#endif
static bool tryLock(FILE *f)
{
const int exitCode =
#if defined(_WIN32) || defined(WIN32)
_locking(_fileno(f), _LK_NBLCK, 10);
#else
lockf(fileno(f), F_TLOCK, 10);
#endif
return exitCode == 0;
}
int main(int argc, char *argv[])
{
if (argc != 2) {
std::cerr << "tool needs exactly one argument" << std::endl;
return 1;
}
const std::string lockFilePath = std::string(argv[0]) + ".lock";
std::FILE * const lockFile = std::fopen(lockFilePath.c_str(), "w");
if (!lockFile) {
std::cerr << "cannot open lock file: " << strerror(errno) << std::endl;
return 2;
}
if (!tryLock(lockFile)) {
if (errno == EACCES || errno == EAGAIN) {
std::cerr << "tool is exclusive" << std::endl;
return 3;
} else {
std::cerr << "unexpected lock failure: " << strerror(errno) << std::endl;
fclose(lockFile);
return 4;
}
}
std::this_thread::sleep_for(std::chrono::milliseconds(50));
fclose(lockFile);
std::FILE * const output = std::fopen(argv[1], "w");
if (!output) {
std::cerr << "cannot create output file: " << strerror(errno) << std::endl;
return 5;
}
fclose(output);
}
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