?RCS: $Id: d_shmat.U 1 2006-08-24 12:32:52Z rmanfredi $
?RCS:
?RCS: Copyright (c) 1991-1997, 2004-2006, 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 4.0.
?RCS:
?RCS: $Log: d_shmat.U,v $
?RCS: Revision 3.0.1.3  1995/07/25  14:04:23  ram
?RCS: patch56: use findhdr to find <sys/shm.h>, to get the right one (ADO)
?RCS:
?RCS: Revision 3.0.1.2  1994/05/13  15:18:56  ram
?RCS: patch27: added new symbol HAS_SHMAT_PROTOTYPE (ADO)
?RCS:
?RCS: Revision 3.0.1.1  1994/05/06  14:54:18  ram
?RCS: patch23: new Shmat_t symbol to declare return type of shmat()
?RCS:
?RCS: Revision 3.0  1993/08/18  12:07:18  ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?MAKE:d_shmat shmattype d_shmatprototype: Inlibc cat +cc +ccflags \
	rm cppstdin cppflags cppminus Findhdr Setvar contains
?MAKE:	-pick add $@ %<
?S:d_shmat:
?S:	This variable conditionally defines the HAS_SHMAT symbol, which
?S:	indicates to the C program that the shmat() routine is available.
?S:.
?S:shmattype:
?S:	This symbol contains the type of pointer returned by shmat().
?S:	It can be 'void *' or 'char *'.
?S:.
?S:d_shmatprototype:
?S:	This variable conditionally defines the HAS_SHMAT_PROTOTYPE 
?S:	symbol, which indicates that sys/shm.h has a prototype for
?S:	shmat.
?S:.
?C:HAS_SHMAT:
?C:	This symbol, if defined, indicates that the shmat() routine is
?C:	available to attach a shared memory segment to the process space.
?C:.
?C:Shmat_t:
?C:	This symbol holds the return type of the shmat() system call.
?C:	Usually set to 'void *' or 'char *'.
?C:.
?C:HAS_SHMAT_PROTOTYPE:
?C:	This symbol, if defined, indicates that the sys/shm.h includes
?C:	a prototype for shmat().  Otherwise, it is up to the program to
?C:	guess one.  Shmat_t shmat _((int, Shmat_t, int)) is a good guess,
?C:	but not always right so it should be emitted by the program only
?C:	when HAS_SHMAT_PROTOTYPE is not defined to avoid conflicting defs.
?C:.
?H:#$d_shmat HAS_SHMAT		/**/
?H:#define Shmat_t $shmattype	/**/
?H:#$d_shmatprototype HAS_SHMAT_PROTOTYPE	/**/
?H:.
?LINT:set d_shmat d_shmatprototype
?T:xxx
: see if shmat exists
set shmat d_shmat
eval $inlibc
: see what shmat returns
case "$d_shmat" in
"$define")
	$cat >shmat.c <<'END'
#include <sys/shm.h>
void *shmat();
END
	if $cc $ccflags -c shmat.c >/dev/null 2>&1; then
		shmattype='void *'
	else
		shmattype='char *'
	fi
	echo "and it returns ($shmattype)." >&4
	: see if a prototype for shmat is available
	xxx=`./findhdr sys/shm.h`
	$cppstdin $cppflags $cppminus < $xxx > shmat.c 2>/dev/null
	if $contains 'shmat.*(' shmat.c >/dev/null 2>&1; then
		val="$define"
	else
		val="$undef"
	fi
	$rm -f shmat.[co]
	;;
*)
	val="$undef"
	;;
esac
set d_shmatprototype
eval $setvar

