select: stop treating POLLRDBAND as an error

POLLRDBAND does not seem to be an general error and on Windows the value
for POLLIN is 768 and the value for POLLRDBAND is 512.

Fixes #10501
Reported-by: opensslonzos-github on github
Closes #10592

diff --git a/lib/select.c b/lib/select.c
index 3b8d468bd847898435b0aada0995b8b0a60eaaf0..61cce619b485f78d16e3ce5312215a4677980e3f 100644 (file)
--- a/lib/select.c
+++ b/lib/select.c
@@ -230,14 +230,14 @@ int Curl_socket_check(curl_socket_t readfd0, /* two sockets to read from */
   if(readfd0 != CURL_SOCKET_BAD) {
     if(pfd[num].revents & (POLLRDNORM|POLLIN|POLLERR|POLLHUP))
       r |= CURL_CSELECT_IN;
-    if(pfd[num].revents & (POLLRDBAND|POLLPRI|POLLNVAL))
+    if(pfd[num].revents & (POLLPRI|POLLNVAL))
       r |= CURL_CSELECT_ERR;
     num++;
   }
   if(readfd1 != CURL_SOCKET_BAD) {
     if(pfd[num].revents & (POLLRDNORM|POLLIN|POLLERR|POLLHUP))
       r |= CURL_CSELECT_IN2;
-    if(pfd[num].revents & (POLLRDBAND|POLLPRI|POLLNVAL))
+    if(pfd[num].revents & (POLLPRI|POLLNVAL))
       r |= CURL_CSELECT_ERR;
     num++;
   }