https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=aa86784937ec7868c358dd90ea5e5324f0be750d
commit aa86784937ec7868c358dd90ea5e5324f0be750d Author: Marc Hoersken <[email protected]> Date: Wed Jul 15 20:53:21 2020 +0200 Cygwin: make sure failed sockets always signal writability Since FD_CONNECT is only given once, we manually need to set FD_WRITE for connection failed sockets to have consistent behaviour in programs calling poll/select multiple times. Example test to non-listening port: curl -v 127.0.0.1:47 Diff: --- winsup/cygwin/fhandler_socket_inet.cc | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/winsup/cygwin/fhandler_socket_inet.cc b/winsup/cygwin/fhandler_socket_inet.cc index 74c415d60..e5b0d2d14 100644 --- a/winsup/cygwin/fhandler_socket_inet.cc +++ b/winsup/cygwin/fhandler_socket_inet.cc @@ -376,6 +376,12 @@ fhandler_socket_wsock::evaluate_events (const long event_mask, long &events, if (erase) wsock_events->events &= ~(events & ~(FD_WRITE | FD_CLOSE)); } + /* Since FD_CONNECT is only given once, we manually need to set + FD_WRITE for connection failed sockets to have consistent + behaviour in programs calling poll/select multiple times. + Example test to non-listening port: curl -v 127.0.0.1:47 */ + if ((connect_state () == connect_failed) && (event_mask & FD_WRITE)) + wsock_events->events |= FD_WRITE; UNLOCK_EVENTS; return ret;
