Function forEachRunningProcess

src/envmodule.cpp:478–515

template <class F>
void forEachRunningProcess(F&& f)
{
  HandlePtr snapshot(CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0));

  if (snapshot.get() == INVALID_HANDLE_VALUE) {
    const auto e = GetLastError();
    log::error("CreateToolhelp32Snapshot() failed, {}", formatSystemMessage(e));
    return;
  }

  PROCESSENTRY32 entry = {};
  entry.dwSize         = sizeof(entry);

  // first process, this shouldn't fail because there's at least one process
  // running
  if (!Process32First(snapshot.get(), &entry)) {
    const auto e = GetLastError();
    log::error("Process32First() failed, {}", formatSystemMessage(e));
    return;
  }

  for (;;) {
    if (!f(entry)) {
      break;
    }

    // next process
    if (!Process32Next(snapshot.get(), &entry)) {
      const auto e = GetLastError();

      // no more processes is not an error
      if (e != ERROR_NO_MORE_FILES)
        log::error("Process32Next() failed, {}", formatSystemMessage(e));

      break;
    }
  }
}

std::vector<Process> getRunningProcesses()
{