Support Cygwin local sockets.

* src/assuan-socket.c (cygwin_fdtable, cygwin_fdtable_cs): New.
(is_cygwin_fd, insert_cygwin_fd, delete_cygwin_fd): New.
(assuan_sock_init) [W32]: Init the CS.
(assuan_sock_deinit) [W32]: Deinit the CS.
(read_port_and_nonce): Add arg cygwin and detect Cygwin socket files.
(_assuan_sock_set_flag): Add "cygwin" flag.
(_assuan_sock_get_flag): Ditto.
(do_readn, do_writen): New.
(_assuan_sock_bind): Create a Cygwin socket file depending on a socket
flag.
(_assuan_sock_connect): Handle the cygwin socket protocol.
(_assuan_sock_check_nonce): Ditto.
--

This code has not been tested.

Signed-off-by: Werner Koch <wk@gnupg.org>

1 files changed, 13 insertions, 1 deletions

diff --git a/doc/assuan.texi b/doc/assuan.texi
index 14f2cf0..0a49d71 100644
--- a/doc/assuan.texi
+++ b/doc/assuan.texi
@@ -2069,7 +2069,19 @@ Store the current value of the flag @var{name} for socket @var{fd} at
 success; on failure sets ERRNO and returns -1.
 @end deftypefun
 
-No flags are defined.
+The supported flags are:
+
+@table @code
+@item cygwin
+This flag has an effect only on Windows.  If the value is 1, the
+socket is set into Cygwin mode so that Cygwin clients can connect to
+such a socket.  This flag needs to be set before a bind and should not
+be changed during the lifetime of the socket.  There is no need to set
+this flag for connecting to a Cygwin style socket because no state is
+required at the client.  On non-Windows platforms setting this flag is
+ignored, reading the flag always returns a value of 0.
+
+@end table
 
 
 @c ---------------------------------------------------------------------