X-Git-Url: https://git.distorted.org.uk/~mdw/catacomb/blobdiff_plain/71080a1b7e1bb95a65007aa2263562e43a477d32..ff98dc94cb5d9498cd92edd6b734ec863d763852:/noise.c

diff --git a/noise.c b/noise.c
index 90889306..c122506f 100644
--- a/noise.c
+++ b/noise.c
@@ -390,7 +390,8 @@ int noise_freewheel(rand_pool *r)
 
 done:
   signal(SIGALRM, sigal);
-  TV_SUB(&oitv.it_value, &oitv.it_value, &itv.it_value);
+  if (oitv.it_value.tv_sec || oitv.it_value.tv_usec)
+    TV_SUB(&oitv.it_value, &oitv.it_value, &itv.it_value);
   setitimer(ITIMER_REAL, &oitv, 0);
   return (rc);
 }