?RCS: $Id: d_keepsig.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_keepsig.U,v $
?RCS: Revision 3.0.1.4  1995/07/25  13:57:56  ram
?RCS: patch56: made cc and ccflags optional dependencies
?RCS:
?RCS: Revision 3.0.1.3  1995/01/11  15:26:25  ram
?RCS: patch45: protected "sh -c" within backquotes for Linux and SGI
?RCS:
?RCS: Revision 3.0.1.2  1994/10/29  16:13:59  ram
?RCS: patch36: call ./bsd explicitely instead of relying on PATH
?RCS:
?RCS: Revision 3.0.1.1  1993/10/16  13:48:47  ram
?RCS: patch12: comment for SIGNALS_KEPT was the other way round
?RCS:
?RCS: Revision 3.0  1993/08/18  12:06:26  ram
?RCS: Baseline for dist 3.0 netwide release.
?RCS:
?MAKE:d_keepsig: cat Compile rm Guess contains echo n c Setvar run
?MAKE:	-pick add $@ %<
?S:d_keepsig:
?S:	This variable contains the eventual value of the SIGNALS_KEPT symbol,
?S:	which indicates to the C program if signal handlers need not reinstated
?S:	after receipt of a signal.
?S:.
?C:SIGNALS_KEPT (PERSISTENT_SIGNAL):
?C:	This symbol is defined if signal handlers needn't be reinstated after
?C:	receipt of a signal.
?C:.
?H:#$d_keepsig SIGNALS_KEPT	/**/
?H:.
?F:!try !try.out
?LINT:set d_keepsig
: see if signals are kept
val="$undef";
echo " "
echo "Checking to see if signal handlers stick around..." >&4
$cat >try.c <<'EOCP'
foo() {}

int main()
{
	signal(2, foo);
	kill(getpid(), 2);
	kill(getpid(), 2);
	printf("abc\n");
}
EOCP
set try
if eval $compile; then
?X: On AIX a single ./try will not work (with ksh)
?X: Backquotes required on Linux and SGI (prevents "ambiguous output redirect")
?X: (reported by Xavier LeVourch <xavierl@eiffel.com>)
	echo `sh -c $run ./try >try.out 2>/dev/null` >/dev/null
	if $contains abc try.out >/dev/null 2>&1; then
		echo "Yes, they do."
		val="$define";
	else
		echo "No, they don't."
	fi
else
	$echo $n "(I can't seem to compile the test program. Assuming $c"
	if ./bsd; then
		echo "they do.)"
		val="$define"
	else
		echo "they don't.)"
	fi
fi
set d_keepsig
eval $setvar
$rm -f try*