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* fhandler_socket.cc (fhandler_socket::af_local_connect): Drop outdated 

comment.
	(fhandler_socket::evaluate_events): Only set connect_state and call
	af_local_connect if connect_state is connect_pending.  Explain why.
	Drop redundant test for socket family and type.
	(fhandler_socket::connect): Extend comment.
This commit is contained in:
Corinna Vinschen 2014-10-11 16:37:29 +00:00
parent 2483fa2719
commit a85ab1d482
2 changed files with 31 additions and 12 deletions
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9
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,12 @@
2014-10-11 Corinna Vinschen <corinna@vinschen.de>
* fhandler_socket.cc (fhandler_socket::af_local_connect): Drop outdated
comment.
(fhandler_socket::evaluate_events): Only set connect_state and call
af_local_connect if connect_state is connect_pending. Explain why.
Drop redundant test for socket family and type.
(fhandler_socket::connect): Extend comment.
2014-10-11 Corinna Vinschen <corinna@vinschen.de>
* fhandler_socket.cc (fhandler_socket::evaluate_events): Handle

34
winsup/cygwin/fhandler_socket.cc
View File

@ -398,7 +398,6 @@ fhandler_socket::af_local_connect ()
{
bool orig_async_io, orig_is_nonblocking;
/* This keeps the test out of select. */
if (get_addr_family () != AF_LOCAL || get_socket_type () != SOCK_STREAM)
return 0;
@ -623,23 +622,32 @@ fhandler_socket::evaluate_events (const long event_mask, long &events,
if (evts.lNetworkEvents & FD_CONNECT)
{
wsock_events->connect_errorcode = evts.iErrorCode[FD_CONNECT_BIT];
/* Setting the connect_state and calling the AF_LOCAL handshake
here allows to handle this stuff from a single point. This
is independent of FD_CONNECT being requested. Consider a
server calling connect(2) and then immediately poll(2) with
only polling for POLLIN (example: postfix), or select(2) just
asking for descriptors ready to read). */
if (wsock_events->connect_errorcode)
connect_state (connect_failed);
else if (get_addr_family () == AF_LOCAL
&& get_socket_type () == SOCK_STREAM
&& af_local_connect ())
asking for descriptors ready to read.
Something weird occurs in Winsock: If you fork off and call
recv/send on the duplicated, already connected socket, another
FD_CONNECT event is generated in the child process. This
would trigger a call to af_local_connect which obviously fail.
Avoid this by calling set_connect_state only if connect_state
is connect_pending. */
if (connect_state () == connect_pending)
{
wsock_events->connect_errorcode = WSAGetLastError ();
connect_state (connect_failed);
if (wsock_events->connect_errorcode)
connect_state (connect_failed);
else if (af_local_connect ())
{
wsock_events->connect_errorcode = WSAGetLastError ();
connect_state (connect_failed);
}
else
connect_state (connected);
}
else
connect_state (connected);
}
UNLOCK_EVENTS;
if ((evts.lNetworkEvents & FD_OOB) && wsock_events->owner)
@ -1130,7 +1138,9 @@ fhandler_socket::connect (const struct sockaddr *name, int namelen)
/* Initialize connect state to "connect_pending". State is ultimately set
to "connected" or "connect_failed" in wait_for_events when the FD_CONNECT
event occurs. */
event occurs. Note that the underlying OS sockets are always non-blocking
and a successfully initiated non-blocking Winsock connect always returns
WSAEWOULDBLOCK. Thus it's safe to rely on event handling. */
connect_state (connect_pending);
int res = ::connect (get_socket (), (struct sockaddr *) &sst, namelen);