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+?RCS: $Id: d_keepsig.U,v 18.104.22.168 1995/07/25 13:57:56 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_keepsig.U,v $
+?RCS: Revision 22.214.171.124 1995/07/25 13:57:56 ram
+?RCS: patch56: made cc and ccflags optional dependencies
+?RCS: Revision 126.96.36.199 1995/01/11 15:26:25 ram
+?RCS: patch45: protected "sh -c" within backquotes for Linux and SGI
+?RCS: Revision 188.8.131.52 1994/10/29 16:13:59 ram
+?RCS: patch36: call ./bsd explicitely instead of relying on PATH
+?RCS: Revision 184.108.40.206 1993/10/16 13:48:47 ram
+?RCS: patch12: comment for SIGNALS_KEPT was the other way round
+?RCS: Revision 3.0 1993/08/18 12:06:26 ram
+?RCS: Baseline for dist 3.0 netwide release.
+?MAKE:d_keepsig: cat +cc +ccflags rm Guess contains echo n c Setvar
+?MAKE: -pick add $@ %<
+?S: This variable contains the eventual value of the SIGNALS_KEPT symbol,
+?S: which indicates to the C program if signal handlers need not reinstated
+?S: after receipt of a signal.
+?C: This symbol is defined if signal handlers needn't be reinstated after
+?C: receipt of a signal.
+?H:#$d_keepsig SIGNALS_KEPT /**/
+: see if signals are kept
+echo " "
+echo "Checking to see if signal handlers stick around..." >&4
+$cat >try.c <<'EOCP'
+ signal(2, foo);
+ kill(getpid(), 2);
+ kill(getpid(), 2);
+if $cc -o try $ccflags try.c >/dev/null 2>&1; 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 <firstname.lastname@example.org>)
+ `sh -c ./try >try.out 2>/dev/null`
+ if $contains abc try.out >/dev/null 2>&1; then
+ echo "Yes, they do."
+ echo "No, they don't."
+ $echo $n "(I can't seem to compile the test program. Assuming $c"
+ if ./bsd; then
+ echo "they do.)"
+ echo "they don't.)"
+$rm -f try*