unix: Fix calculation of poll() timeout in sp_wait().

diff --git a/serialport.c b/serialport.c
index eda2d19250fdcc7316b9f1f60ffa21ff4d37655f..72010913ae4e7a2cc4772112afc857350e7a37f0 100644 (file)
--- a/serialport.c
+++ b/serialport.c
@@ -1448,6 +1448,7 @@ SP_API enum sp_return sp_wait(struct sp_event_set *event_set,
        RETURN_OK();
 #else
        struct timeout timeout;
+       int poll_timeout;
        int result;
        struct pollfd *pollfds;
        unsigned int i;
@@ -1478,7 +1479,11 @@ SP_API enum sp_return sp_wait(struct sp_event_set *event_set,
                        break;
                }
 
-               result = poll(pollfds, event_set->count, timeout_remaining_ms(&timeout) || -1);
+               poll_timeout = (int) timeout_remaining_ms(&timeout);
+               if (poll_timeout == 0)
+                       poll_timeout = -1;
+
+               result = poll(pollfds, event_set->count, poll_timeout);
 
                timeout_update(&timeout);