X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/4108c8d21f2dff8c2666fdeebc5a76b449e2808c..47b4109534706a8de4ddcbfb2fa377de6b5b95ea:/noise.c

diff --git a/noise.c b/noise.c
index 9088930..c122506 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);
 }