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cppcheck/cli/processexecutor.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2023 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 "processexecutor.h"
#if !defined(WIN32) && !defined(__MINGW32__)
#include "config.h"
#include "cppcheck.h"
#include "cppcheckexecutor.h"
#include "errorlogger.h"
#include "errortypes.h"
#include "importproject.h"
#include "settings.h"
#include "suppressions.h"
#include <algorithm>
#include <numeric>
#include <cassert>
#include <cerrno>
#include <csignal>
#include <cstdlib>
#include <cstring>
#include <functional>
#include <iostream>
#include <list>
#include <sstream> // IWYU pragma: keep
#include <sys/select.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;
// NOLINTNEXTLINE(misc-unused-using-decls) - required for FD_ZERO
using std::memset;
ProcessExecutor::ProcessExecutor(const std::map<std::string, std::size_t> &files, Settings &settings, ErrorLogger &errorLogger)
: Executor(files, settings, errorLogger)
{
assert(mSettings.jobs > 1);
}
ProcessExecutor::~ProcessExecutor()
{}
class PipeWriter : public ErrorLogger {
public:
enum PipeSignal {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 writeToPipe(PipeSignal type, const std::string &data) const
{
unsigned int len = static_cast<unsigned int>(data.length() + 1);
char *out = new char[len + 1 + sizeof(len)];
out[0] = static_cast<char>(type);
std::memcpy(&(out[1]), &len, sizeof(len));
std::memcpy(&(out[1+sizeof(len)]), data.c_str(), len);
std::size_t bytes_to_write = len + 1 + sizeof(len);
ssize_t bytes_written = write(mWpipe, out, len + 1 + sizeof(len));
if (bytes_written <= 0) {
const int err = errno;
delete[] out;
out = nullptr;
std::cerr << "#### ThreadExecutor::writeToPipe() error for type " << type << ": " << std::strerror(err) << std::endl;
std::exit(EXIT_FAILURE);
}
// TODO: write until everything is written
if (bytes_written != bytes_to_write) {
delete[] out;
out = nullptr;
std::cerr << "#### ThreadExecutor::writeToPipe() error for type " << type << ": insufficient data written (expected: " << bytes_to_write << " / got: " << bytes_written << ")" << std::endl;
std::exit(EXIT_FAILURE);
}
delete[] out;
}
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);
}
// Don't rely on incoming data being null-terminated.
// Allocate +1 element and null-terminate the buffer.
char *buf = new char[len + 1];
char *data_start = buf;
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);
buf[len] = 0;
bool res = true;
if (type == PipeWriter::REPORT_OUT) {
// the first character is the color
const Color c = static_cast<Color>(buf[0]);
mErrorLogger.reportOut(buf + 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;
}
delete[] buf;
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;
} else 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 std::pair<std::string, std::size_t>& p) {
return v + p.second;
});
std::list<int> rpipes;
std::map<pid_t, std::string> childFile;
std::map<int, std::string> pipeFile;
std::size_t processedsize = 0;
std::map<std::string, std::size_t>::const_iterator iFile = mFiles.cbegin();
std::list<ImportProject::FileSettings>::const_iterator iFileSettings = mSettings.project.fileSettings.cbegin();
for (;;) {
// Start a new child
const size_t nchildren = childFile.size();
if ((iFile != mFiles.cend() || iFileSettings != mSettings.project.fileSettings.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 | O_NONBLOCK) < 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, CppCheckExecutor::executeCommand);
fileChecker.settings() = mSettings;
unsigned int resultOfCheck = 0;
if (iFileSettings != mSettings.project.fileSettings.end()) {
resultOfCheck = fileChecker.check(*iFileSettings);
} else {
// Read file from a file
resultOfCheck = fileChecker.check(iFile->first);
}
pipewriter.writeEnd(std::to_string(resultOfCheck));
std::exit(EXIT_SUCCESS);
}
close(pipes[1]);
rpipes.push_back(pipes[0]);
if (iFileSettings != mSettings.project.fileSettings.end()) {
childFile[pid] = iFileSettings->filename + ' ' + iFileSettings->cfg;
pipeFile[pipes[0]] = iFileSettings->filename + ' ' + iFileSettings->cfg;
++iFileSettings;
} else {
childFile[pid] = iFile->first;
pipeFile[pipes[0]] = iFile->first;
++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);
struct 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 std::map<std::string, std::size_t>::const_iterator fs = mFiles.find(name);
if (fs != mFiles.end()) {
size = fs->second;
}
}
fileCount++;
processedsize += size;
if (!mSettings.quiet)
Executor::reportStatus(fileCount, mFiles.size() + mSettings.project.fileSettings.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 == mSettings.project.fileSettings.end() && rpipes.empty() && childFile.empty()) {
// All done
break;
}
}
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(locations,
emptyString,
Severity::error,
"Internal error: " + msg,
"cppcheckError",
Certainty::normal);
if (!mSettings.nomsg.isSuppressed(errmsg))
mErrorLogger.reportErr(errmsg);
}
#endif // !WIN32
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