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* 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.
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