?RCS: $Id: d_socket.U,v 3.0.1.2 1997/02/28 15:46:00 ram Exp $
?RCS:
?RCS: Copyright (c) 1991-1993, Raphael Manfredi
?RCS: 
?RCS: You may redistribute only under the terms of the Artistic Licence,
?RCS: as specified in the README file that comes with the distribution.
?RCS: You may reuse parts of this distribution only within the terms of
?RCS: that same Artistic Licence; a copy of which may be found at the root
?RCS: of the source tree for dist 3.0.
?RCS:
?RCS: $Log: d_socket.U,v $
?RCS: Revision 3.0.1.2  1997/02/28  15:46:00  ram
?RCS: patch61: replaced .a with $_a all over the place
?RCS:
?RCS: Revision 3.0.1.1  1994/01/24  14:08:04  ram
?RCS: patch16: can now safely declare private nm_extract in dependencies
?RCS:
?RCS: Revision 3.0  1993/08/18  12:07:26  ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?MAKE:d_socket d_oldsock d_sockpair socketlib sockethdr: contains libc \
	echo n c nm_opt nm_extract Inlibc Csym _a
?MAKE:	-pick add $@ %<
?S:d_socket:
?S:	This variable conditionally defines HAS_SOCKET, which indicates
?S:	that the BSD socket interface is supported.
?S:.
?S:d_sockpair:
?S:	This variable conditionally defines the HAS_SOCKETPAIR symbol, which
?S:	indicates that the BSD socketpair() is supported.
?S:.
?S:d_oldsock:
?S:	This variable conditionally defines the OLDSOCKET symbol, which
?S:	indicates that the BSD socket interface is based on 4.1c and not 4.2.
?S:.
?S:socketlib:
?S:	This variable has the names of any libraries needed for socket support.
?S:.
?S:sockethdr:
?S:	This variable has any cpp -I flags needed for socket support.
?S:.
?C:HAS_SOCKET (SOCKET):
?C:	This symbol, if defined, indicates that the BSD socket interface is
?C:	supported.
?C:.
?C:HAS_SOCKETPAIR (SOCKETPAIR):
?C:	This symbol, if defined, indicates that the BSD socketpair() call is
?C:	supported.
?C:.
?C:USE_OLDSOCKET (OLDSOCKET):
?C:	This symbol, if defined, indicates that the 4.1c BSD socket interface
?C:	is supported instead of the 4.2/4.3 BSD socket interface. For instance,
?C:	there is no setsockopt() call.
?C:.
?H:#$d_socket HAS_SOCKET		/**/
?H:#$d_sockpair HAS_SOCKETPAIR	/**/
?H:#$d_oldsock USE_OLDSOCKET	/**/
?H:.
?T:val
?LINT:set d_sockpair
socketlib=''
sockethdr=''
: see whether socket exists
echo " "
$echo $n "Hmm... $c" >&4
if set socket val -f d_socket; eval $csym; $val; then
	echo "Looks like you have Berkeley networking support." >&4
	d_socket="$define"
?X: now check for advanced features
	if set setsockopt val -f; eval $csym; $val; then
		d_oldsock="$undef"
	else
		echo "...but it uses the old 4.1c interface, rather than 4.2" >&4
		d_oldsock="$define"
	fi
else
?X: HP-UX, for one, puts all the socket stuff in socklib.o. Note that if we
?X:	come here on HP-UX, then we must have used nm to get symbols, or we really
?X: don't have sockets anyway...
	if $contains socklib libc.list >/dev/null 2>&1; then
		echo "Looks like you have Berkeley networking support." >&4
		d_socket="$define"
		: we will have to assume that it supports the 4.2 BSD interface
		d_oldsock="$undef"
	else
		echo "You don't have Berkeley networking in libc$_a..." >&4
?X: look for an optional networking library
		if test -f /usr/lib/libnet$_a; then
?X: space between two  '(' needed for ksh
			( (nm $nm_opt /usr/lib/libnet$_a | eval $nm_extract) ||  \
			ar t /usr/lib/libnet$_a) 2>/dev/null >> libc.list
			if $contains socket libc.list >/dev/null 2>&1; then
			echo "...but the Wollongong group seems to have hacked it in." >&4
				socketlib="-lnet"
				sockethdr="-I/usr/netinclude"
				d_socket="$define"
?X: now check for advanced features
				if $contains setsockopt libc.list >/dev/null 2>&1; then
					d_oldsock="$undef"
				else
					echo "...using the old 4.1c interface, rather than 4.2" >&4
					d_oldsock="$define"
				fi
			else
				echo "or even in libnet$_a, which is peculiar." >&4
				d_socket="$undef"
				d_oldsock="$undef"
			fi
		else
			echo "or anywhere else I see." >&4
			d_socket="$undef"
			d_oldsock="$undef"
		fi
	fi
fi

@if HAS_SOCKETPAIR || d_sockpair
: see if socketpair exists
set socketpair d_sockpair
eval $inlibc

@end