Adding socket support: unix, ipv4, ipv6.

* socket.c, socket.h: New files.

* Makefile: include new socket.o among objects if have_objects
variable is defined to 'y'.

* configure (have_sockets): New variable. New configure test
for socket-related functionality.
(HAVE_SOCKETS, HAVE_GETADDRINFO): New configuration
preprocessor symbols.
Also, reordering the shell probing so that /usr/xpg4/bin/sh
is the last fallback. On Solaris, it chokes on some code
that is needed for Solaris.

* lisplib.c (sock_set_entries, sock_instantiate): New static
functions.
(lisplib_init): Register new functions as autoload hooks.

* share/txr/stdlib/socket.tl: New file.

* stream.c (socket_error_s): New symbol variable.
(struct stdio_handle): New members, family and type, helping
stdio streams represent sockets too.
(stdio_stream_mark): Mark new members of struct stdio_handle.
(make_stdio_stream_common): Initialize new members.
(make_sock_stream, stream_fd, sock_family, sock_type,
open_socket, open_sockfd): New functions.
(stream_init): Initialize socket_error_s variable.  Register
sock-family, sock-type and open-socket intrinsic functions.
Register socket-error subtype.

* stream.h (socket_error_s, make_sock_stream, stream_fd,
sock_family, sock_type, open_socket, open_sockfd):
Declared.

1 files changed, 28 insertions, 0 deletions

diff --git a/socket.h b/socket.h
new file mode 100644
index 00000000..b334ee27
--- /dev/null
+++ b/socket.h
@@ -0,0 +1,28 @@
+/* Copyright 2010-2016
+ * Kaz Kylheku <kaz@kylheku.com>
+ * Vancouver, Canada
+ * All rights reserved.
+ *
+ * Redistribution of this software in source and binary forms, with or without
+ * modification, is permitted provided that the following two conditions are met.
+ *
+ * Use of this software in any manner constitutes agreement with the disclaimer
+ * which follows the two conditions.
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DAMAGES, HOWEVER CAUSED,
+ * AND UNDER ANY THEORY OF LIABILITY, ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+void sock_init(void);
+void sock_load_init(void);