How to avoid using printf in a signal handler?

Question

Since printf is not reentrant, it\'s not supposed to be safe to use it in a signal handler. But I\'ve seen lots of example codes that uses printf t

Answer 1

You can use printf in signal handlers if you are using the pthread library. unix/posix specifies that printf is atomic for threads cf Dave Butenhof reply here : https://groups.google.com/forum/#!topic/comp.programming.threads/1-bU71nYgqw Note that in order to get a clearer picture of printf output, you should run your application in a console (on linux use ctl+alt+f1 to start console 1), rather than a pseudo-tty created by the GUI.