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