From 729780a810bbcb12b245a1b652302a601fc9f6fd Mon Sep 17 00:00:00 2001
From: Antoine Pitrou <pitrou@free.fr>
Date: Fri, 30 Jun 2017 10:01:05 +0200
Subject: bpo-30807: signal.setitimer() may disable the timer by mistake
 (#2493)

* bpo-30807: signal.setitimer() may disable the timer by mistake

* Add NEWS blurb
---
 Modules/signalmodule.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'Modules/signalmodule.c')

diff --git a/Modules/signalmodule.c b/Modules/signalmodule.c
index cbf0d54305..b511d17c38 100644
--- a/Modules/signalmodule.c
+++ b/Modules/signalmodule.c
@@ -139,6 +139,10 @@ timeval_from_double(double d, struct timeval *tv)
 {
     tv->tv_sec = floor(d);
     tv->tv_usec = fmod(d, 1.0) * 1000000.0;
+    /* Don't disable the timer if the computation above rounds down to zero. */
+    if (d > 0.0 && tv->tv_sec == 0 && tv->tv_usec == 0) {
+        tv->tv_usec = 1;
+    }
 }
 
 Py_LOCAL_INLINE(double)
-- 
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