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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
This commit is contained in:
Marc Hoersken 2020-07-15 20:53:21 +02:00 committed by Corinna Vinschen
parent b1237e64fd
commit aa86784937
1 changed files with 6 additions and 0 deletions
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6
winsup/cygwin/fhandler_socket_inet.cc
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@ -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;