https://ccl.clozure.com/blog/ Recent content on Clozure Common Lisp Hugo en-us Tue, 26 May 2026 11:10:41 -0700 https://ccl.clozure.com/blog/posts/debug-signal-handlers-on-darwin/ Tue, 26 May 2026 11:10:41 -0700 https://ccl.clozure.com/blog/posts/debug-signal-handlers-on-darwin/ <p>On Darwin (i.e., on <del>Mac OS X</del> <del>OS X</del> macOS), Unix signals are implemented on top of the Mach exception handling mechanism. The problem is that the debugger (at least as of some years ago) would stop at the underlying Mach exception, and there was no apparent way to continue to the signal handler.</p> <p>I was doing some experiments on an arm64 Mac, and it turns out that current lldb now has a way: the <a href="https://lldb.llvm.org/use/settings.html#platform.plugin.darwin.ignored-exceptions">platform.plugin.darwin.ignored-exceptions</a> setting.</p>