cppcheck/cli/threadexecutor.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2010 Daniel Marjamäki and Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "threadexecutor.h"
#include "cppcheck.h"
#include <iostream>
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#include <algorithm>
#if (defined(__GNUC__) || defined(__sun)) && !defined(__MINGW32__)
#include <sys/wait.h>
#include <unistd.h>
#include <fcntl.h>
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#include <cstdlib>
#include <cstring>
#include <cstdio>
#include <errno.h>
#include <time.h>
#endif
ThreadExecutor::ThreadExecutor(const std::vector<std::string> &filenames, const Settings &settings, ErrorLogger &errorLogger)
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: _filenames(filenames), _settings(settings), _errorLogger(errorLogger), _fileCount(0)
{
#if (defined(__GNUC__) || defined(__sun)) && !defined(__MINGW32__)
_pipe[0] = _pipe[1] = 0;
#endif
}
ThreadExecutor::~ThreadExecutor()
{
//dtor
}
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void ThreadExecutor::addFileContent(const std::string &path, const std::string &content)
{
_fileContents[ path ] = content;
}
///////////////////////////////////////////////////////////////////////////////
////// This code is for __GNUC__ and __sun only ///////////////////////////////
///////////////////////////////////////////////////////////////////////////////
#if (defined(__GNUC__) || defined(__sun)) && !defined(__MINGW32__)
int ThreadExecutor::handleRead(unsigned int &result)
{
char type = 0;
if (read(_pipe[0], &type, 1) <= 0)
{
if (errno == EAGAIN)
return 0;
return -1;
}
if (type != '1' && type != '2' && type != '3')
{
std::cerr << "#### You found a bug from cppcheck.\nThreadExecutor::handleRead error, type was:" << type << std::endl;
exit(0);
}
unsigned int len = 0;
if (read(_pipe[0], &len, sizeof(len)) <= 0)
{
std::cerr << "#### You found a bug from cppcheck.\nThreadExecutor::handleRead error, type was:" << type << std::endl;
exit(0);
}
char *buf = new char[len];
if (read(_pipe[0], buf, len) <= 0)
{
std::cerr << "#### You found a bug from cppcheck.\nThreadExecutor::handleRead error, type was:" << type << std::endl;
exit(0);
}
if (type == '1')
{
_errorLogger.reportOut(buf);
}
else if (type == '2')
{
ErrorLogger::ErrorMessage msg;
msg.deserialize(buf);
// Alert only about unique errors
std::string errmsg = msg.toString(_settings._verbose);
if (std::find(_errorList.begin(), _errorList.end(), errmsg) == _errorList.end())
{
_errorList.push_back(errmsg);
_errorLogger.reportErr(msg);
}
}
else if (type == '3')
{
_fileCount++;
std::istringstream iss(buf);
unsigned int fileResult = 0;
iss >> fileResult;
result += fileResult;
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_errorLogger.reportStatus(_fileCount, (unsigned int)_filenames.size());
delete [] buf;
return -1;
}
delete [] buf;
return 1;
}
unsigned int ThreadExecutor::check()
{
_fileCount = 0;
unsigned int result = 0;
if (pipe(_pipe) == -1)
{
perror("pipe");
exit(1);
}
int flags = 0;
if ((flags = fcntl(_pipe[0], F_GETFL, 0)) < 0)
{
perror("fcntl");
exit(1);
}
if (fcntl(_pipe[0], F_SETFL, flags | O_NONBLOCK) < 0)
{
perror("fcntl");
exit(1);
}
unsigned int childCount = 0;
unsigned int i = 0;
while (true)
{
// Start a new child
if (i < _filenames.size() && childCount < _settings._jobs)
{
pid_t pid = fork();
if (pid < 0)
{
// Error
std::cerr << "Failed to create child process" << std::endl;
exit(EXIT_FAILURE);
}
else if (pid == 0)
{
CppCheck fileChecker(*this);
fileChecker.settings(_settings);
if (_fileContents.size() > 0 && _fileContents.find(_filenames[i]) != _fileContents.end())
{
// File content was given as a string
fileChecker.addFile(_filenames[i], _fileContents[ _filenames[i] ]);
}
else
{
// Read file from a file
fileChecker.addFile(_filenames[i]);
}
unsigned int resultOfCheck = fileChecker.check();
std::ostringstream oss;
oss << resultOfCheck;
writeToPipe('3', oss.str());
exit(0);
}
++childCount;
++i;
}
else if (childCount > 0)
{
// Wait for child to quit before stating new processes
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while (true)
{
int readRes = handleRead(result);
if (readRes == -1)
break;
else if (readRes == 0)
{
struct timespec duration;
duration.tv_sec = 0;
duration.tv_nsec = 5 * 1000 * 1000; // 5 ms
nanosleep(&duration, NULL);
}
}
int stat = 0;
waitpid(0, &stat, 0);
--childCount;
}
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else if (childCount == 0)
{
// All done
break;
}
}
return result;
}
void ThreadExecutor::writeToPipe(char type, const std::string &data)
{
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std::size_t len = data.length() + 1;
char *out = new char[ len + 1 + sizeof(len)];
out[0] = type;
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std::memcpy(&(out[1]), &len, sizeof(len));
std::memcpy(&(out[1+sizeof(len)]), data.c_str(), len);
if (write(_pipe[1], out, len + 1 + sizeof(len)) <= 0)
{
delete [] out;
out = 0;
std::cerr << "#### ThreadExecutor::writeToPipe, Failed to write to pipe" << std::endl;
exit(0);
}
delete [] out;
}
void ThreadExecutor::reportOut(const std::string &outmsg)
{
writeToPipe('1', outmsg);
}
void ThreadExecutor::reportErr(const ErrorLogger::ErrorMessage &msg)
{
writeToPipe('2', msg.serialize());
}
void ThreadExecutor::reportStatus(unsigned int /*index*/, unsigned int /*max*/)
{
// Not used
}
#else
unsigned int ThreadExecutor::check()
{
return 0;
}
void ThreadExecutor::reportOut(const std::string &/*outmsg*/)
{
}
void ThreadExecutor::reportErr(const ErrorLogger::ErrorMessage &/*msg*/)
{
}
void ThreadExecutor::reportStatus(unsigned int /*index*/, unsigned int /*max*/)
{
}
#endif