static _Thread_local int thread_timer_set;
static _Thread_local timer_t thread_timerid;
+/* internal signal lists */
+static int sigerr[] = { SIG_FOR_TIMER, SIGSEGV, SIGFPE, SIGILL, SIGBUS, 0 };
+static int sigterm[] = { SIGINT, SIGABRT, SIGTERM, 0 };
+static int exiting = 0;
+
/*
* Dumps the current stack
*/
static void safe_dumpstack(int crop, int signum)
{
- int args[2] = { crop, signum };
+ int args[2] = { crop + 3, signum };
in_safe_dumpstack = 1;
sig_monitor(0, safe_dumpstack_cb, args);
}
}
+/* install the handlers */
+static int install(void (*handler)(int), int *signals)
+{
+ int result = 1;
+ struct sigaction sa;
+
+ sa.sa_handler = handler;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = SA_NODEFER;
+ while(*signals > 0) {
+ if (sigaction(*signals, &sa, NULL) < 0) {
+ ERROR("failed to install signal handler for signal %s: %m", strsignal(*signals));
+ result = 0;
+ }
+ signals++;
+ }
+ return result;
+}
+
+/*
+ * rescue exit
+ */
+static void on_rescue_exit(int signum)
+{
+ ERROR("Rescue exit for signal %d: %s", signum, strsignal(signum));
+ _exit(exiting);
+}
+
+/*
+ * Do a safe exit
+ */
+static void safe_exit(int code)
+{
+ install(on_rescue_exit, sigerr);
+ install(on_rescue_exit, sigterm);
+ exiting = code;
+ exit(code);
+}
/* Handles signals that terminate the process */
static void on_signal_terminate (int signum)
if (signum == SIGABRT)
safe_dumpstack(3, signum);
}
- exit(1);
+ safe_exit(1);
}
/* Handles monitored signals that can be continued */
static void on_signal_error(int signum)
{
- sigset_t sigset;
-
if (in_safe_dumpstack)
longjmp(*error_handler, signum);
longjmp(*error_handler, signum);
ERROR("Unmonitored signal %d received: %s", signum, strsignal(signum));
- exit(2);
-}
-
-/* install the handlers */
-static int install(void (*handler)(int), int *signals)
-{
- int result = 1;
- struct sigaction sa;
-
- sa.sa_handler = handler;
- sigemptyset(&sa.sa_mask);
- sa.sa_flags = SA_NODEFER;
- while(*signals > 0) {
- if (sigaction(*signals, &sa, NULL) < 0) {
- ERROR("failed to install signal handler for signal %s: %m", strsignal(*signals));
- result = 0;
- }
- signals++;
- }
- return result;
+ safe_exit(2);
}
int sig_monitor_init()
{
- static int sigerr[] = { SIG_FOR_TIMER, SIGSEGV, SIGFPE, SIGILL, SIGBUS, 0 };
- static int sigterm[] = { SIGINT, SIGABRT, SIGTERM, 0 };
-
return (install(on_signal_error, sigerr) & install(on_signal_terminate, sigterm)) - 1;
}