+ if (sigaction(sig, &sa, NULL) < 0)
+ r = -errno;
+
+ va_start(ap, sig);
+ while ((sig = va_arg(ap, int)) > 0)
+ if (sigaction(sig, &sa, NULL) < 0)
+ r = -errno;
+ va_end(ap);
+
+ return r;
+}
+
+int default_signals(int sig, ...) {
+ struct sigaction sa;
+ va_list ap;
+ int r = 0;
+
+ zero(sa);
+ sa.sa_handler = SIG_DFL;
+ sa.sa_flags = SA_RESTART;
+
+ if (sigaction(sig, &sa, NULL) < 0)
+ r = -errno;
+
+ va_start(ap, sig);
+ while ((sig = va_arg(ap, int)) > 0)
+ if (sigaction(sig, &sa, NULL) < 0)
+ r = -errno;
+ va_end(ap);
+
+ return r;