1 files changed, 11 insertions, 0 deletions
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index f220c26..d4f2098 100755
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -789,6 +789,17 @@ internal_select(PySocketSockObject *s, int writing, _PyTime_t interval,
     ms = _PyTime_AsMilliseconds(interval, _PyTime_ROUND_CEILING);
     assert(ms <= INT_MAX);
 
+    /* On some OSes, typically BSD-based ones, the timeout parameter of the
+       poll() syscall, when negative, must be exactly INFTIM, where defined,
+       or -1. See issue 37811. */
+    if (ms < 0) {
+#ifdef INFTIM
+        ms = INFTIM;
+#else
+        ms = -1;
+#endif
+    }
+
     Py_BEGIN_ALLOW_THREADS;
     n = poll(&pollfd, 1, (int)ms);
     Py_END_ALLOW_THREADS;