Hrvoje Niksic wrote: Looking at the sourc and header files for 2.2.0-pre8, the SVR4 SA_SIGINFO option appears to be either supported, or planned to be supported. I didn't succeed in getting your test program to work, although I didn't try particularly hard. I'm wondering if the SA_SIGINFO support requires glibc 2.1. In any case, Stevens indicates that BSD doesn't use the SVR4 approach, and older versions of Linux clearly don't, so I reckon that any support for determining the fault address would need to support platform-specific variations. -- Glynn Clements <glynn(a)sensei.co.uk&gt;