cppcheck/cli/processexecutor.cpp at master · albert-github/cppcheck · GitHub

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* Cppcheck - A tool for static C/C++ code analysis

* 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 "processexecutor.h"

#if !defined(WIN32) && !defined(__MINGW32__)

#include "config.h"

#include "cppcheck.h"

#include "errorlogger.h"

#include "errortypes.h"

#include "filesettings.h"

#include "settings.h"

#include "suppressions.h"

#include "timer.h"

#include <algorithm>

#include <numeric>

#include <cassert>

#include <cerrno>

#include <csignal>

#include <cstdint>

#include <cstdlib>

#include <cstring>

#include <iostream>

#include <list>

#include <map>

#include <sstream>

#include <sys/select.h>

#include <sys/time.h>

#include <sys/types.h>

#include <sys/wait.h>

#include <unistd.h>

#include <utility>

#include <fcntl.h>

#ifdef __SVR4 // Solaris

#include <sys/loadavg.h>

#endif

#if defined(__linux__)

#include <sys/prctl.h>

#endif

enum class Color : std::uint8_t;

// NOLINTNEXTLINE(misc-unused-using-decls) - required for FD_ZERO

using std::memset;

ProcessExecutor::ProcessExecutor(const std::list<FileWithDetails> &files, const std::list<FileSettings>& fileSettings, const Settings &settings, SuppressionList &suppressions, ErrorLogger &errorLogger, CppCheck::ExecuteCmdFn executeCommand)

: Executor(files, fileSettings, settings, suppressions, errorLogger)

, mExecuteCommand(std::move(executeCommand))

{

assert(mSettings.jobs > 1);

}

namespace {

class PipeWriter : public ErrorLogger {

public:

enum PipeSignal : std::uint8_t {REPORT_OUT='1',REPORT_ERROR='2', CHILD_END='5'};

explicit PipeWriter(int pipe) : mWpipe(pipe) {}

void reportOut(const std::string &outmsg, Color c) override {

writeToPipe(REPORT_OUT, static_cast<char>(c) + outmsg);

}

void reportErr(const ErrorMessage &msg) override {

writeToPipe(REPORT_ERROR, msg.serialize());

}

void writeEnd(const std::string& str) const {

writeToPipe(CHILD_END, str);

}

private:

// TODO: how to log file name in error?

void writeToPipeInternal(PipeSignal type, const void* data, std::size_t to_write) const

{

const ssize_t bytes_written = write(mWpipe, data, to_write);

if (bytes_written <= 0) {

const int err = errno;

std::cerr << "#### ThreadExecutor::writeToPipeInternal() error for type " << type << ": " << std::strerror(err) << std::endl;

std::exit(EXIT_FAILURE);

}

// TODO: write until everything is written

if (bytes_written != to_write) {

std::cerr << "#### ThreadExecutor::writeToPipeInternal() error for type " << type << ": insufficient data written (expected: " << to_write << " / got: " << bytes_written << ")" << std::endl;

std::exit(EXIT_FAILURE);

}

void writeToPipe(PipeSignal type, const std::string &data) const

{

const auto t = static_cast<char>(type);

writeToPipeInternal(type, &t, 1);

}

const auto len = static_cast<unsigned int>(data.length());

{

static constexpr std::size_t l_size = sizeof(unsigned int);

writeToPipeInternal(type, &len, l_size);

}

writeToPipeInternal(type, data.c_str(), len);

}

const int mWpipe;

};

}

bool ProcessExecutor::handleRead(int rpipe, unsigned int &result, const std::string& filename)

{

std::size_t bytes_to_read;

ssize_t bytes_read;

char type = 0;

bytes_to_read = sizeof(char);

bytes_read = read(rpipe, &type, bytes_to_read);

if (bytes_read <= 0) {

if (errno == EAGAIN)

return true;

// TODO: log details about failure

// need to increment so a missing pipe (i.e. premature exit of forked process) results in an error exitcode

++result;

return false;

}

if (bytes_read != bytes_to_read) {

std::cerr << "#### ThreadExecutor::handleRead(" << filename << ") error (type): insufficient data read (expected: " << bytes_to_read << " / got: " << bytes_read << ")" << std::endl;

std::exit(EXIT_FAILURE);

}

if (type != PipeWriter::REPORT_OUT && type != PipeWriter::REPORT_ERROR && type != PipeWriter::CHILD_END) {

std::cerr << "#### ThreadExecutor::handleRead(" << filename << ") invalid type " << int(type) << std::endl;

std::exit(EXIT_FAILURE);

}

unsigned int len = 0;

bytes_to_read = sizeof(len);

bytes_read = read(rpipe, &len, bytes_to_read);

if (bytes_read <= 0) {

const int err = errno;

std::cerr << "#### ThreadExecutor::handleRead(" << filename << ") error (len) for type " << int(type) << ": " << std::strerror(err) << std::endl;

std::exit(EXIT_FAILURE);

}

if (bytes_read != bytes_to_read) {

std::cerr << "#### ThreadExecutor::handleRead(" << filename << ") error (len) for type" << int(type) << ": insufficient data read (expected: " << bytes_to_read << " / got: " << bytes_read << ")" << std::endl;

std::exit(EXIT_FAILURE);

}

std::string buf(len, '\0');

char *data_start = &buf[0];

bytes_to_read = len;

do {

bytes_read = read(rpipe, data_start, bytes_to_read);

if (bytes_read <= 0) {

const int err = errno;

std::cerr << "#### ThreadExecutor::handleRead(" << filename << ") error (buf) for type" << int(type) << ": " << std::strerror(err) << std::endl;

std::exit(EXIT_FAILURE);

}

bytes_to_read -= bytes_read;

data_start += bytes_read;

} while (bytes_to_read != 0);

bool res = true;

if (type == PipeWriter::REPORT_OUT) {

// the first character is the color

const auto c = static_cast<Color>(buf[0]);

// TODO: avoid string copy

mErrorLogger.reportOut(buf.substr(1), c);

} else if (type == PipeWriter::REPORT_ERROR) {

ErrorMessage msg;

try {

msg.deserialize(buf);

} catch (const InternalError& e) {

std::cerr << "#### ThreadExecutor::handleRead(" << filename << ") internal error: " << e.errorMessage << std::endl;

std::exit(EXIT_FAILURE);

}

if (hasToLog(msg))

mErrorLogger.reportErr(msg);

} else if (type == PipeWriter::CHILD_END) {

result += std::stoi(buf);

res = false;

}

return res;

}

bool ProcessExecutor::checkLoadAverage(size_t nchildren)

{

#if defined(__QNX__) || defined(__HAIKU__) // getloadavg() is unsupported on Qnx, Haiku.

(void)nchildren;

return true;

#else

if (!nchildren || !mSettings.loadAverage) {

return true;

}

double sample(0);

if (getloadavg(&sample, 1) != 1) {

// disable load average checking on getloadavg error

return true;

}

if (sample < mSettings.loadAverage) {

return true;

}

return false;

#endif

}

unsigned int ProcessExecutor::check()

{

unsigned int fileCount = 0;

unsigned int result = 0;

const std::size_t totalfilesize = std::accumulate(mFiles.cbegin(), mFiles.cend(), std::size_t(0), [](std::size_t v, const FileWithDetails& p) {

return v + p.size();

});

std::list<int> rpipes;

std::map<pid_t, std::string> childFile;

std::map<int, std::string> pipeFile;

std::size_t processedsize = 0;

std::list<FileWithDetails>::const_iterator iFile = mFiles.cbegin();

std::list<FileSettings>::const_iterator iFileSettings = mFileSettings.cbegin();

for (;;) {

// Start a new child

const size_t nchildren = childFile.size();

if ((iFile != mFiles.cend() || iFileSettings != mFileSettings.cend()) && nchildren < mSettings.jobs && checkLoadAverage(nchildren)) {

int pipes[2];

if (pipe(pipes) == -1) {

std::cerr << "#### ThreadExecutor::check, pipe() failed: "<< std::strerror(errno) << std::endl;

std::exit(EXIT_FAILURE);

}

const int flags = fcntl(pipes[0], F_GETFL, 0);

if (flags < 0) {

std::cerr << "#### ThreadExecutor::check, fcntl(F_GETFL) failed: "<< std::strerror(errno) << std::endl;

std::exit(EXIT_FAILURE);

}

if (fcntl(pipes[0], F_SETFL, flags) < 0) {

std::cerr << "#### ThreadExecutor::check, fcntl(F_SETFL) failed: "<< std::strerror(errno) << std::endl;

std::exit(EXIT_FAILURE);

}

const pid_t pid = fork();

if (pid < 0) {

// Error

std::cerr << "#### ThreadExecutor::check, Failed to create child process: "<< std::strerror(errno) << std::endl;

std::exit(EXIT_FAILURE);

} else if (pid == 0) {

#if defined(__linux__)

prctl(PR_SET_PDEATHSIG, SIGHUP);

#endif

close(pipes[0]);

PipeWriter pipewriter(pipes[1]);

CppCheck fileChecker(pipewriter, false, mExecuteCommand);

fileChecker.settings() = mSettings;

unsigned int resultOfCheck = 0;

if (iFileSettings != mFileSettings.end()) {

resultOfCheck = fileChecker.check(*iFileSettings);

if (fileChecker.settings().clangTidy)

fileChecker.analyseClangTidy(*iFileSettings);

} else {

// Read file from a file

resultOfCheck = fileChecker.check(*iFile);

// TODO: call analyseClangTidy()?

}

pipewriter.writeEnd(std::to_string(resultOfCheck));

std::exit(EXIT_SUCCESS);

}

close(pipes[1]);

rpipes.push_back(pipes[0]);

if (iFileSettings != mFileSettings.end()) {

childFile[pid] = iFileSettings->filename() + ' ' + iFileSettings->cfg;

pipeFile[pipes[0]] = iFileSettings->filename() + ' ' + iFileSettings->cfg;

++iFileSettings;

} else {

childFile[pid] = iFile->path();

pipeFile[pipes[0]] = iFile->path();

++iFile;

}

if (!rpipes.empty()) {

fd_set rfds;

FD_ZERO(&rfds);

for (std::list<int>::const_iterator rp = rpipes.cbegin(); rp != rpipes.cend(); ++rp)

FD_SET(*rp, &rfds);

timeval tv; // for every second polling of load average condition

tv.tv_sec = 1;

tv.tv_usec = 0;

const int r = select(*std::max_element(rpipes.cbegin(), rpipes.cend()) + 1, &rfds, nullptr, nullptr, &tv);

if (r > 0) {

std::list<int>::iterator rp = rpipes.begin();

while (rp != rpipes.end()) {

if (FD_ISSET(*rp, &rfds)) {

std::string name;

const std::map<int, std::string>::iterator p = pipeFile.find(*rp);

if (p != pipeFile.end()) {

name = p->second;

}

const bool readRes = handleRead(*rp, result, name);

if (!readRes) {

std::size_t size = 0;

if (p != pipeFile.end()) {

pipeFile.erase(p);

const auto fs = std::find_if(mFiles.cbegin(), mFiles.cend(), [&name](const FileWithDetails& entry) {

return entry.path() == name;

});

if (fs != mFiles.end()) {

size = fs->size();

}

fileCount++;

processedsize += size;

if (!mSettings.quiet)

Executor::reportStatus(fileCount, mFiles.size() + mFileSettings.size(), processedsize, totalfilesize);

close(*rp);

rp = rpipes.erase(rp);

} else

++rp;

} else

++rp;

}

if (!childFile.empty()) {

int stat = 0;

const pid_t child = waitpid(0, &stat, WNOHANG);

if (child > 0) {

std::string childname;

const std::map<pid_t, std::string>::iterator c = childFile.find(child);

if (c != childFile.end()) {

childname = c->second;

childFile.erase(c);

}

if (WIFEXITED(stat)) {

const int exitstatus = WEXITSTATUS(stat);

if (exitstatus != EXIT_SUCCESS) {

std::ostringstream oss;

oss << "Child process exited with " << exitstatus;

reportInternalChildErr(childname, oss.str());

}

} else if (WIFSIGNALED(stat)) {

std::ostringstream oss;

oss << "Child process crashed with signal " << WTERMSIG(stat);

reportInternalChildErr(childname, oss.str());

}

if (iFile == mFiles.end() && iFileSettings == mFileSettings.end() && rpipes.empty() && childFile.empty()) {

// All done

break;

}

// TODO: wee need to get the timing information from the subprocess

if (mSettings.showtime == SHOWTIME_MODES::SHOWTIME_SUMMARY || mSettings.showtime == SHOWTIME_MODES::SHOWTIME_TOP5_SUMMARY)

CppCheck::printTimerResults(mSettings.showtime);

return result;

}

void ProcessExecutor::reportInternalChildErr(const std::string &childname, const std::string &msg)

{

std::list<ErrorMessage::FileLocation> locations;

locations.emplace_back(childname, 0, 0);

const ErrorMessage errmsg(std::move(locations),

emptyString,

Severity::error,

"Internal error: " + msg,

"cppcheckError",

Certainty::normal);

if (!mSuppressions.isSuppressed(errmsg, {}))

mErrorLogger.reportErr(errmsg);

}

#endif // !WIN32

cppcheck/cli/processexecutor.cpp at master · albert-github/cppcheck · GitHub

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