06/04/09 - joe turner <joe@agavemountain.com> 20 Minute Code Review Agave Mountain Agave Mountain, Inc. Joe Turner

06/04/09 - joe turner <joe@agavemountain.com> 1. Signal Handler / Back Trace

06/04/09 - joe turner <joe@agavemountain.com> Signal handler registered and is called : CTRL-C stops application Bus fault Floating point exception segment fault etc… Calls back_trace() and/or prints out signal # Signal Handler static void sig_handler(int signum) { switch (signum) { case SIGHUP: case SIGINT: case SIGILL: case SIGBUS: case SIGFPE: case SIGSEGV: case SIGTERM: case SIGSTKFLT: back_trace(); default: printf(&quot;Caught signal %d
&quot;, signum); }; exit(0); }

06/04/09 - joe turner <joe@agavemountain.com> glibc now has a built in functions for generating a backtrace. **See speaker’s notes for the glibc documentation. back_trace() static void back_trace(void) { int c, i; void *addresses[10]; char **strings; c = backtrace(addresses, 10); strings = backtrace_symbols(addresses,c); printf(&quot;backtrace returned: %d
&quot;, c); for(i = 0; i < c; i++) { printf(&quot;%d: %X &quot;, i, (int)addresses[i]); printf(&quot;%s
&quot;, strings[i]); } free (strings); }

The End. and happily ever after. 06/04/09 - joe turner <joe@agavemountain.com>