* unix/configure.in:

	* unix/tcl.m4:
	* unix/tclUnixPipe.c: removed checking for compatible vfork
	function and use of the vfork function.  Modern VM systems rarely
	suffer any performance degradation when fork is used, and it
	solves multiple problems with vfork.  Users that still want vfork
	and add -Dfork=vfork to the compile flags. [Bug: 942 2228 1312]

1 files changed, 0 insertions, 62 deletions

diff --git a/unix/tcl.m4 b/unix/tcl.m4
index a347af6..0b8fdda 100644
--- a/unix/tcl.m4
+++ b/unix/tcl.m4
@@ -1445,68 +1445,6 @@ AC_DEFUN(SC_BLOCKING_STYLE, [
 ])
 
 #--------------------------------------------------------------------
-# SC_HAVE_VFORK
-#
-#	Check to see whether the system provides a vfork kernel call.
-#	If not, then use fork instead.  Also, check for a problem with
-#	vforks and signals that can cause core dumps if a vforked child
-#	resets a signal handler.  If the problem exists, then use fork
-#	instead of vfork.
-#
-# Arguments:
-#	none
-#	
-# Results:
-#
-#	Defines some of the following vars:
-#		vfork (=fork)
-#
-#--------------------------------------------------------------------
-
-AC_DEFUN(SC_HAVE_VFORK, [
-    AC_TYPE_SIGNAL()
-    AC_CHECK_FUNC(vfork, tcl_ok=1, tcl_ok=0)
-    if test "$tcl_ok" = 1; then
-	AC_MSG_CHECKING([vfork/signal bug]);
-	AC_TRY_RUN([
-#include <stdio.h>
-#include <signal.h>
-#include <sys/wait.h>
-int gotSignal = 0;
-sigProc(sig)
-    int sig;
-{
-    gotSignal = 1;
-}
-main()
-{
-    int pid, sts;
-    (void) signal(SIGCHLD, sigProc);
-    pid = vfork();
-    if (pid <  0) {
-	exit(1);
-    } else if (pid == 0) {
-	(void) signal(SIGCHLD, SIG_DFL);
-	_exit(0);
-    } else {
-	(void) wait(&sts);
-    }
-    exit((gotSignal) ? 0 : 1);
-}], tcl_ok=1, tcl_ok=0, tcl_ok=0)
-
-	if test "$tcl_ok" = 1; then
-	    AC_MSG_RESULT(ok)
-	else
-	    AC_MSG_RESULT([buggy, using fork instead])
-	fi
-    fi
-    rm -f core
-    if test "$tcl_ok" = 0; then
-	AC_DEFINE(vfork, fork)
-    fi
-])
-
-#--------------------------------------------------------------------
 # SC_TIME_HANLDER
 #
 #	Checks how the system deals with time.h, what time structures