netcat源代码分析，doexec ()函数和readwrite ()函数的关系

#ifdef GAPING_SECURITY_HOLE
   if (pr00gie)           /* -e given? */
       doexec (netfd);
#ifdef WIN32
   if (!pr00gie) // doexec does the read/write for win32
#endif

#endif /* GAPING_SECURITY_HOLE */

x = readwrite (netfd); /* it even works with UDP! */

如果有-e选项调用 doexec (netfd);代替readwrite (netfd);