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* fhandler_socket.cc (fhandler_socket::connect): Init connect_state to 

connect_pending only on unconnected socket.  Set connect_state to
	connected on WSAEISCONN error.  Set connect_state to connect_failed
	on any other error except WSAEWOULDBLOCK if connect is still pending.
	Add lots of comment to explain why all of the above.
This commit is contained in:
Corinna Vinschen 2014-10-14 19:08:27 +00:00
parent 34e2edb76a
commit 2599a694a6
2 changed files with 29 additions and 4 deletions
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8
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,11 @@
2014-10-14 Corinna Vinschen <corinna@vinschen.de>
* fhandler_socket.cc (fhandler_socket::connect): Init connect_state to
connect_pending only on unconnected socket. Set connect_state to
connected on WSAEISCONN error. Set connect_state to connect_failed
on any other error except WSAEWOULDBLOCK if connect is still pending.
Add lots of comment to explain why all of the above.
2014-10-13 Corinna Vinschen <corinna@vinschen.de>
* net.cc (cygwin_setsockopt): Drop redundant test for AF_LOCAL and

25
winsup/cygwin/fhandler_socket.cc
View File

@ -1166,8 +1166,16 @@ fhandler_socket::connect (const struct sockaddr *name, int namelen)
to "connected" or "connect_failed" in wait_for_events when the FD_CONNECT
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);
WSAEWOULDBLOCK. Thus it's safe to rely on event handling.
Check for either unconnected or connect_failed since in both cases it's
allowed to retry connecting the socket. It's also ok (albeit ugly) to
call connect to check if a previous non-blocking connect finished.
Set connect_state before calling connect, otherwise a race condition with
an already running select or poll might occur. */
if (connect_state () == unconnected || connect_state () == connect_failed)
connect_state (connect_pending);
int res = ::connect (get_socket (), (struct sockaddr *) &sst, namelen);
if (!is_nonblocking ()
@ -1179,14 +1187,23 @@ fhandler_socket::connect (const struct sockaddr *name, int namelen)
{
DWORD err = WSAGetLastError ();
/* Some applications use the ugly technique to check if a non-blocking
connect succeeded by calling connect again, until it returns EISCONN.
This circumvents the event handling and connect_state is never set.
Thus we check for this situation here. */
if (err == WSAEISCONN)
connect_state (connected);
/* Winsock returns WSAEWOULDBLOCK if the non-blocking socket cannot be
conected immediately. Convert to POSIX/Linux compliant EINPROGRESS. */
if (is_nonblocking () && err == WSAEWOULDBLOCK)
else if (is_nonblocking () && err == WSAEWOULDBLOCK)
WSASetLastError (WSAEINPROGRESS);
/* Winsock returns WSAEINVAL if the socket is already a listener.
Convert to POSIX/Linux compliant EISCONN. */
else if (err == WSAEINVAL)
else if (err == WSAEINVAL && connect_state () == listener)
WSASetLastError (WSAEISCONN);
/* Any other error means the connmect failed. */
else if (connect_state () == connect_pending)
connect_state (connect_failed);
set_winsock_errno ();
}