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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2025 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/>.
*/
#if defined(__CYGWIN__)
#define _BSD_SOURCE // required to have getloadavg()
#endif
#include "processexecutor.h"
#ifdef HAS_THREADING_MODEL_FORK
#include "cppcheck.h"
#include "errorlogger.h"
#include "errortypes.h"
#include "filesettings.h"
#include "settings.h"
#include "suppressions.h"
#include "timer.h"
#include "utils.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, Suppressions &suppressions, ErrorLogger &errorLogger, TimerResults* timerResults, CppCheck::ExecuteCmdFn executeCommand)
: Executor(files, fileSettings, settings, suppressions, errorLogger, timerResults)
, 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',REPORT_SUPPR_INLINE='3',REPORT_SUPPR='4',CHILD_END='5',REPORT_METRIC='6'};
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 writeSuppr(const SuppressionList &supprs) const {
for (const auto& suppr : supprs.getSuppressions())
{
if (suppr.isInline)
writeToPipe(REPORT_SUPPR_INLINE, suppressionToString(suppr));
else if (suppr.checked)
writeToPipe(REPORT_SUPPR, suppressionToString(suppr));
}
}
void reportMetric(const std::string &metric) override {
writeToPipe(REPORT_METRIC, metric);
}
void writeEnd(const std::string& str) const {
writeToPipe(CHILD_END, str);
}
private:
static std::string suppressionToString(const SuppressionList::Suppression &suppr)
{
std::string suppr_str = suppr.toString();
suppr_str += ";";
suppr_str += suppr.checked ? "1" : "0";
suppr_str += ";";
suppr_str += suppr.matched ? "1" : "0";
suppr_str += ";";
suppr_str += suppr.extraComment;
return suppr_str;
}
// 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 " << static_cast<unsigned char>(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 " << static_cast<unsigned char>(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);
}
if (len > 0) // TODO: unexpected - write a warning?
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::REPORT_SUPPR_INLINE &&
type != PipeWriter::REPORT_SUPPR &&
type != PipeWriter::CHILD_END &&
type != PipeWriter::REPORT_METRIC) {
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');
if (len > 0) { // TODO: unexpected - write a warning?
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::REPORT_SUPPR_INLINE || type == PipeWriter::REPORT_SUPPR) {
if (!buf.empty()) {
// TODO: avoid string splitting
auto parts = splitString(buf, ';');
if (parts.size() < 4)
{
// TODO: make this non-fatal
std::cerr << "#### ThreadExecutor::handleRead(" << filename << ") adding of inline suppression failed - insufficient data" << std::endl;
std::exit(EXIT_FAILURE);
}
auto suppr = SuppressionList::parseLine(parts[0]);
suppr.isInline = (type == PipeWriter::REPORT_SUPPR_INLINE);
suppr.checked = parts[1] == "1";
suppr.matched = parts[2] == "1";
suppr.extraComment = parts[3];
for (std::size_t i = 4; i < parts.size(); i++) {
suppr.extraComment += ";" + parts[i];
}
const std::string err = mSuppressions.nomsg.addSuppression(suppr);
if (!err.empty()) {
// TODO: only update state if it doesn't exist - otherwise propagate error
mSuppressions.nomsg.updateSuppressionState(suppr); // TODO: check result
// TODO: make this non-fatal
//std::cerr << "#### ThreadExecutor::handleRead(" << filename << ") adding of inline suppression failed - " << err << std::endl;
//std::exit(EXIT_FAILURE);
}
}
} else if (type == PipeWriter::CHILD_END) {
result += std::stoi(buf);
res = false;
} else if (type == PipeWriter::REPORT_METRIC) {
mErrorLogger.reportMetric(buf);
}
return res;
}
bool ProcessExecutor::checkLoadAverage(size_t nchildren)
{
#if defined(__QNX__) || defined(__HAIKU__) || defined(_AIX) // getloadavg() is unsupported on Qnx, Haiku, AIX.
(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;
auto iFile = mFiles.cbegin();
auto 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(mSettings, mSuppressions, pipewriter, mTimerResults, false, mExecuteCommand);
unsigned int resultOfCheck = 0;
if (iFileSettings != mFileSettings.end()) {
resultOfCheck = fileChecker.check(*iFileSettings);
} else {
// Read file from a file
resultOfCheck = fileChecker.check(*iFile);
}
pipewriter.writeSuppr(mSuppressions.nomsg);
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 (auto 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) {
auto rp = rpipes.cbegin();
while (rp != rpipes.cend()) {
if (FD_ISSET(*rp, &rfds)) {
std::string name;
const auto p = utils::as_const(pipeFile).find(*rp);
if (p != pipeFile.cend()) {
name = p->second;
}
const bool readRes = handleRead(*rp, result, name);
if (!readRes) {
std::size_t size = 0;
if (p != pipeFile.cend()) {
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 auto c = utils::as_const(childFile).find(child);
if (c != childFile.cend()) {
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 (mTimerResults && (mSettings.showtime == ShowTime::SUMMARY || mSettings.showtime == ShowTime::TOP5_SUMMARY))
mTimerResults->showResults(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),
"",
Severity::error,
"Internal error: " + msg,
"cppcheckError",
Certainty::normal);
if (!mSuppressions.nomsg.isSuppressed(errmsg, {}))
mErrorLogger.reportErr(errmsg);
}
#endif // HAS_THREADING_MODEL_FORK