+2015-03-27 Eli Zaretskii <eliz@gnu.org>
+
+ Support non-blocking connect on MS-Windows.
+ Based on ideas from Kim F. Storm <storm@cua.dk>, see
+ http://lists.gnu.org/archive/html/emacs-devel/2006-12/msg00873.html.
+
+ * w32proc.c (reader_thread): If the FILE_CONNECT flag is set, call
+ '_sys_wait_connect'. If it returns STATUS_CONNECT_FAILED, exit
+ the thread with code 2.
+ (sys_select): Support 'wfds' in addition to 'rfds'. If a
+ descriptor in 'wfds' has its bit set, but the corresponding
+ fd_info member doesn't have its FILE_CONNECT flag set, ignore the
+ descriptor. Otherwise, acknowledge a successful non-blocking
+ connect by resetting the FILE_CONNECT flag and setting cp->status
+ to STATUS_READ_ACKNOWLEDGED. (Bug#20207)
+
+ * w32.h (STATUS_CONNECT_FAILED): New enumeration value.
+ (struct _child_process): New member 'errcode'.
+ (FILE_CONNECT): New flag.
+ (_sys_wait_connect): Add prototype.
+
+ * w32.c (pfn_WSAEnumNetworkEvents): New function pointer.
+ (init_winsock): Load WSAEnumNetworkEvents from winsock DLL.
+ (set_errno): Map WSAEWOULDBLOCK and WSAENOTCONN.
+ (sys_connect): Support non-blocking 'connect' calls by setting the
+ FILE_CONNECT flag in the fd_info member and returning EINPROGRESS.
+ (_sys_read_ahead): Add debug message if this function is called
+ for a descriptor that waits for a non-blocking connect to complete.
+ (_sys_wait_connect): New function.
+ (sys_read): Support STATUS_CONNECT_FAILED. Return the error code
+ recorded by _sys_wait_connect when the non-blocking connect
+ failed. Don't call WSAGetLastError before a call to set_errno had
+ a chance to use its value, since WSAGetLastError clears the last
+ error.
+
2015-03-25 Stefan Monnier <monnier@iro.umontreal.ca>
* editfns.c (save_excursion_save): Don't save the mark.