How to make X program not abort when its window is closed/server killed?
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Xlib calls the program's supplied error handler if any sort of system call error occurs (for example, the connection to the server was lost). This is assumed to be a fatal condition, and the called routine should not return. If the I/O error handler does return, the client process exits.
So, how should the program continue execution if it doesn't assume i/o error as fatal? goto some label in main()? But then there's a memory leak at least in stack... is there a better way?
If you want to mess around with Xlib, you get to manage the low level details yourself.
If you wanted to try a higher-level framework (which, of course, I strongly encourage), then the framework will probably let you handle things like "window manager close" events more easily. You might want to investigate either/both GTK+ and/or Qt.