Function file_from_handle

cpp-subprocess/subprocess.hpp:386–416

  }

  inline FILE *file_from_handle(HANDLE h, const char *mode)
  {
    int md;
    if (!mode) {
      throw OSError("invalid_mode", 0);
    }

    if (mode[0] == 'w') {
      md = _O_WRONLY;
    }
    else if (mode[0] == 'r') {
      md = _O_RDONLY;
    }
    else {
      throw OSError("file_from_handle", 0);
    }

    int os_fhandle = _open_osfhandle((intptr_t)h, md);
    if (os_fhandle == -1) {
      CloseHandle(h);
      throw OSError("_open_osfhandle", 0);
    }

    FILE *fp = _fdopen(os_fhandle, mode);
    if (fp == 0) {
      subprocess_close(os_fhandle);
      throw OSError("_fdopen", 0);
    }

    return fp;
  }

  inline void configure_pipe(HANDLE* read_handle, HANDLE* write_handle, HANDLE* child_handle)
  {