?RCS: $Id: sockopt.U,v 3.0.1.1 1995/07/25 14:16:14 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: sockopt.U,v $
?RCS: Revision 3.0.1.1  1995/07/25  14:16:14  ram
?RCS: patch56: obsoleted KEEPALIVE in favor of CAN_KEEPALIVE for consistency
?RCS:
?RCS: Revision 3.0  1993/08/18  12:09:48  ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?MAKE:d_keepalive: cat rm contains +cc +ccflags socketlib sockethdr \
	d_oldsock libs Oldconfig Setvar Findhdr
?MAKE:	-pick add $@ %<
?S:d_keepalive:
?S:	This symbol conditionally defines CAN_KEEPALIVE which indicates to the C
?S:	program that setsockopt SO_KEEPALIVE will work properly.
?S:.
?C:CAN_KEEPALIVE (KEEPALIVE):
?C:	This symbol if defined indicates to the C program that the SO_KEEPALIVE
?C:	option of setsockopt() will work as advertised in the manual.
?C:.
?H:#$d_keepalive CAN_KEEPALIVE		/**/
?H:.
?LINT:set d_keepalive
: see if setsockopt with SO_KEEPALIVE works as advertised
echo " "
case "$d_oldsock" in
"$undef")
	if $contains SO_KEEPALIVE `./findhdr sys/socket.h` \
		/dev/null >/dev/null 2>&1
	then
		echo "OK, let's see if SO_KEEPALIVE works as advertised..." >&4
		$cat > socket.c <<EOP
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

int main()
{
	int s = socket(AF_INET, SOCK_STREAM, 0);
	if (s == -1)
		exit(1);
	if (-1 == setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 0, 0))
		exit(2);
	exit(0);
}
EOP
		if $cc $ccflags $sockethdr -o socket socket.c $libs \
			$socketlib >/dev/null 2>&1; then
			./socket >/dev/null 2>&1
			case $? in
			0) echo "Yes, it does!"
				val="$define";;
			1) $cat <<EOM
(Something went wrong -- Assuming SO_KEEPALIVE is broken)
EOM
				val="$undef";;
			2) echo "No, it doesn't.  Don't trust your manuals!!"
				val="$undef";;
			esac
		else
			cat <<EOM
(I can't compile the test program -- Assuming SO_KEEPALIVE is broken)
EOM
			val="$undef"
		fi
	else
		echo "Strange!! You have BSD 4.2 sockets but no SO_KEEPALIVE option."
		val="$undef"
	fi;;
*) cat <<EOM
As you have an old socket interface, you can't have heard of SO_KEEPALIVE.
EOM
	val="$undef";;
esac
set d_keepalive
eval $setvar
$rm -f socket socket.c