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+?RCS: $Id: d_vfork.U,v 1994/08/29 16:18:21 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_vfork.U,v $
+?RCS: Revision 1994/08/29 16:18:21 ram
+?RCS: patch32: set default to 'y' the first time
+?RCS: Revision 1994/06/20 06:59:14 ram
+?RCS: patch30: usevfork was not always properly set
+?RCS: Revision 1994/05/13 15:20:56 ram
+?RCS: patch27: modified to avoid spurious Whoa warnings (ADO)
+?RCS: Revision 1994/05/06 14:59:09 ram
+?RCS: patch23: now explicitely ask whether vfork() should be used (ADO)
+?RCS: Revision 1993/10/16 13:49:39 ram
+?RCS: patch12: added magic for vfork()
+?RCS: Revision 1993/09/13 16:06:57 ram
+?RCS: patch10: removed automatic remapping of vfork on fork (WAD)
+?RCS: patch10: added compatibility code for older (WAD)
+?RCS: Revision 3.0 1993/08/18 12:07:55 ram
+?RCS: Baseline for dist 3.0 netwide release.
+?MAKE:d_vfork usevfork: Inlibc Myread Oldconfig Setvar
+?MAKE: -pick add $@ %<
+?S: This variable conditionally defines the HAS_VFORK symbol, which
+?S: indicates the vfork() routine is available.
+?S: This variable is set to true when the user accepts to use vfork.
+?S: It is set to false when no vfork is available or when the user
+?S: explicitely requests not to use vfork.
+?C: This symbol, if defined, indicates that vfork() exists.
+?H:#$d_vfork HAS_VFORK /**/
+?M:vfork: HAS_VFORK
+?M:#ifndef HAS_VFORK
+?M:#define vfork fork
+?LINT:set d_vfork
+?X: TO BE REMOVED in dist 4.0
+: backward compatibility for d_hvfork
+if test X$d_hvfork != X; then
+ d_vfork="$d_hvfork"
+ d_hvfork=''
+: see if there is a vfork
+set vfork val
+eval $inlibc
+: Ok, but do we want to use it. vfork is reportedly unreliable in
+: perl on Solaris 2.x, and probably elsewhere.
+case "$val" in
+ echo " "
+ case "$usevfork" in
+ false) dflt='n';;
+ *) dflt='y';;
+ esac
+ rp="Some systems have problems with vfork(). Do you want to use it?"
+ . ./myread
+ case "$ans" in
+ y|Y) ;;
+ *)
+ echo "Ok, we won't use vfork()."
+ val="$undef"
+ ;;
+ esac
+ ;;
+?X: Only set it when final value is known to avoid spurious Whoas
+?X: Then set usevfork accordingly to the current value, for next run
+set d_vfork
+eval $setvar
+case "$d_vfork" in
+$define) usevfork='true';;
+*) usevfork='false';;