diff -ur +minimal tcsh-6.03.old/config/config.linux tcsh-6.03/config/config.linux
--- tcsh-6.03.old/config/config.linux	Fri Nov 20 09:04:47 1992
+++ tcsh-6.03/config/config.linux	Sat Jan 30 19:45:04 1993
@@ -36,7 +36,7 @@
  *		Note that some machines eg. rs6000 have a vfork, but not
  *		with the berkeley semantics, so we cannot use it there either.
  */
-#define VFORK
+#undef VFORK
 
 /*
  * BSDJOBS	You have BSD-style job control (both process groups and
@@ -116,7 +116,6 @@
 #define DIRENT
 /****************** local defines *********************/
 
-/* Since people like shared libs so much, we'll make this a default. :-) */
 #define _PATH_TCSHELL "/bin/tcsh"
 #define ECHO_STYLE      BOTH_ECHO
 #ifdef BSDSIGS
diff -ur +minimal tcsh-6.03.old/sh.proc.c tcsh-6.03/sh.proc.c
--- tcsh-6.03.old/sh.proc.c	Fri Nov 20 09:04:22 1992
+++ tcsh-6.03/sh.proc.c	Sat Jan 30 19:52:07 1993
@@ -1823,9 +1823,21 @@
     (void) sighold(SIGCHLD);
 #endif /* !BSDSIGS */
     while ((pid = fork()) < 0)
-	if (setintr == 0)
+	if (setintr == 0) {
+	    /*
+	     *  Unblock SIGCHLD, while waiting for a free process slot.
+	     *  This allows background processes to complete.
+	     */
+#ifdef BSDSIGS
+	    omask = sigsetmask(omask);
 	    (void) sleep(FORKSLEEP);
-	else {
+	    omask = sigsetmask(omask);
+#else
+            sigrelse(SIGCHLD);
+	    (void) sleep(FORKSLEEP);
+            sighold(SIGCHLD);
+#endif
+	} else {
 #ifdef BSDSIGS
 	    (void) sigsetmask(omask);
 #else /* !BSDSIGS */
@@ -1931,7 +1943,7 @@
 	 * either have exited or not yet started to run.  Two uglies become
 	 * one.
 	 */
-	sigpause(omask & ~SYNCHMASK);
+	synch_pause(omask & ~sigmask(SIGCHLD));
 	if (mysigvec(SIGSYNCH, &osv, NULL))
 	    stderror(ERR_SYSTEM, "pfork parent: sigvec restore",
 		     strerror(errno));
diff -ur +minimal tcsh-6.03.old/sh.sem.c tcsh-6.03/sh.sem.c
--- tcsh-6.03.old/sh.sem.c	Fri Nov 20 09:04:22 1992
+++ tcsh-6.03/sh.sem.c	Sat Jan 30 19:57:25 1993
@@ -294,7 +294,12 @@
 		/*
 		 * We need to block SIGCHLD here, so that if the process does
 		 * not die before we can set the process group
-		 */
+		 *
+		 * Why? pfork() already does this!
+		 * Besides, if we run out of processes,
+	         * SIGCHLD remains blocked.
+	         */
+#ifdef notdef
 		if (_gv.wanttty >= 0 && !nosigchld) {
 #ifdef BSDSIGS
 		    csigmask = sigblock(sigmask(SIGCHLD));
@@ -304,8 +309,9 @@
 
 		    nosigchld = 1;
 		}
-
+#endif
 		pid = pfork(t, _gv.wanttty);
+#ifdef notdef
 		if (pid == 0 && nosigchld) {
 #ifdef BSDSIGS
 		    (void) sigsetmask(csigmask);
@@ -314,7 +320,9 @@
 #endif /* BSDSIGS */
 		    nosigchld = 0;
 		}
-		else if (pid != 0 && (t->t_dflg & F_AMPERSAND))
+		else
+#endif
+		if (pid != 0 && (t->t_dflg & F_AMPERSAND))
 		    backpid = pid;
 	    }
 
diff -ur +minimal tcsh-6.03.old/tc.decls.h tcsh-6.03/tc.decls.h
--- tcsh-6.03.old/tc.decls.h	Fri Nov 20 09:04:32 1992
+++ tcsh-6.03/tc.decls.h	Sat Jan 30 19:52:07 1993
@@ -249,6 +249,7 @@
 #endif /* _SEQUENT_ */
 #ifdef SIGSYNCH
 extern	sigret_t	  synch_handler	__P((int));
+extern	void		  synch_pause	__P((sigmask_t));
 #endif /* SIGSYNCH */
 
 
diff -ur +minimal tcsh-6.03.old/tc.sig.c tcsh-6.03/tc.sig.c
--- tcsh-6.03.old/tc.sig.c	Fri Nov 20 09:04:34 1992
+++ tcsh-6.03/tc.sig.c	Sat Jan 30 20:07:48 1993
@@ -399,7 +399,7 @@
 
 
 #ifdef SIGSYNCH
-static long Synch_Cnt = 0;
+static int synch_received = 0;
 
 sigret_t
 synch_handler(sno)
@@ -407,6 +407,13 @@
 {
     if (sno != SIGSYNCH)
 	abort();
-    Synch_Cnt++;
+    synch_received = 1;
+}
+
+void synch_pause(sigmask_t mask)
+{
+    while (!synch_received)
+        sigpause(mask & ~sigmask(SIGSYNCH));
+    synch_received = 0;
 }
 #endif /* SIGSYNCH */
diff -ur +minimal tcsh-6.03.old/tc.sig.h tcsh-6.03/tc.sig.h
--- tcsh-6.03.old/tc.sig.h	Fri Nov 20 09:04:34 1992
+++ tcsh-6.03/tc.sig.h	Sat Jan 30 19:54:12 1993
@@ -163,18 +163,9 @@
 # endif /* SIGWINDOW */
 #endif /* SIGWINCH */
 
-#ifdef convex
-# ifdef notdef
-/* Does not seem to work right... Christos */
-#  define SIGSYNCH       0 
-# endif
-# ifdef SIGSYNCH
-#  define SYNCHMASK 	(sigmask(SIGCHLD)|sigmask(SIGSYNCH))
-# else
-#  define SYNCHMASK 	(sigmask(SIGCHLD))
-# endif
-extern sigret_t synch_handler();
-#endif /* convex */
+#ifdef linux
+# define SIGSYNCH SIGUSR1
+#endif
 
 #ifdef SAVESIGVEC
 # define NSIGSAVED 7