lokinet/llarp/win32/exec.cpp

#include "exec.hpp"
#include "exception.hpp"
#include <llarp/util/logging.hpp>

#include <array>

namespace llarp::win32
{
  namespace
  {
    auto logcat = log::Cat("win32:exec");

    /// get the directory for system32 which contains all the executables we use
    std::string
    SystemExeDir()
    {
      std::array<char, MAX_PATH + 1> path{};

      if (GetSystemDirectoryA(path.data(), path.size()))
        return path.data();

      return "C:\\Windows\\system32";
    }

  }  // namespace

  void
  Exec(std::string exe, std::string args)
  {
    OneShotExec{exe, args};
  }

  OneShotExec::OneShotExec(std::string cmd, std::chrono::milliseconds timeout)
      : _si{}, _pi{}, _timeout{static_cast<DWORD>(timeout.count())}
  {
    log::info(logcat, "exec: {}", cmd);
    if (not CreateProcessA(
            nullptr, cmd.data(), nullptr, nullptr, false, 0, nullptr, nullptr, &_si, &_pi))
      throw win32::error(GetLastError(), "failed to execute subprocess");
  }

  OneShotExec::~OneShotExec()
  {
    WaitForSingleObject(_pi.hProcess, _timeout);
    CloseHandle(_pi.hProcess);
    CloseHandle(_pi.hThread);
  }

  OneShotExec::OneShotExec(std::string cmd, std::string args, std::chrono::milliseconds timeout)
      : OneShotExec{fmt::format("{}\\{} {}", SystemExeDir(), cmd, args), timeout}
  {}

  DeferExec::~DeferExec()
  {
    OneShotExec{std::move(_exe), std::move(_args), std::move(_timeout)};
  }
}  // namespace llarp::win32