Interrupt system fixed up and installed.

Makefile.in

@@ -107,6 +107,7 @@ SCSHOBJS = \
 	scsh/flock.o scsh/flock1.o \
 	scsh/machine/stdio_dep.o \
 	scsh/machine/time_dep1.o \
+	scsh/machine/signals1.o \
 	scsh/machine/libansi.o \
 	scsh/network.o scsh/network1.o \
 	scsh/putenv.o \
@@ -635,11 +636,13 @@ scsh/scsh.image: $(VM) $(SCHEME) $(CIG).image
 	 echo ",load $(srcdir)/scsh/scsh-interfaces.scm"; \
 	 echo ",load $(srcdir)/scsh/machine/packages.scm"; \
 	 echo ",load $(srcdir)/scsh/scsh-package.scm"; \
-	 echo ",user"; \
 	 echo ",load-package scsh"; \
 	 echo ",load-package scsh-here-string-hax"; \
-	 echo ",open scsh"; \
 	 echo ",translate =scheme48/ $(LIB)/"; \
+	 echo ",in scsh-level-0"; \
+	 echo "(%install-scsh-handlers)"; \
+	 echo ",user"; \
+	 echo ",open scsh"; \
 	 echo "(dump-scsh \"scsh/scsh.image\")") \
 	| ./$(VM) -o ./$(VM) -i $(CIG).image
 

scsh/generic/signals.scm

@@ -28,3 +28,6 @@
   (usr1 30)	; user defined signal 1 
   (usr2 31)	; user defined signal 2 
   )
+
+(define signals-ignored-by-default
+  (list signal/chld signal/cont))			; These are Posix.

scsh/scsh.scm

@@ -707,7 +707,8 @@
 
 (define (init-scsh-hindbrain relink-ff?)
   (if relink-ff? (lookup-all-externals)) ; Re-link C calls.
-  (init-fdports!))
+  (init-fdports!)
+  (%install-unix-scsh-handlers))
 
 
 ;;; Some globals:

scsh/sighandlers.scm

@@ -59,6 +59,31 @@
 
 (define with-enabled-interrupts* with-interrupts)
 
+(define interrupt/alarm		(enum interrupt alarm))
+(define interrupt/keyboard	(enum interrupt keyboard))
+(define interrupt/memory-shortage	(enum interrupt memory-shortage))
+(define interrupt/chld		(enum interrupt chld))
+(define interrupt/cont		(enum interrupt cont))
+(define interrupt/hup		(enum interrupt hup))
+(define interrupt/quit		(enum interrupt quit))
+(define interrupt/term		(enum interrupt term))
+(define interrupt/tstp		(enum interrupt tstp))
+(define interrupt/usr1		(enum interrupt usr1))
+(define interrupt/usr2		(enum interrupt usr2))
+(define interrupt/info		(enum interrupt info))
+(define interrupt/io		(enum interrupt io))
+(define interrupt/poll		(enum interrupt poll))
+(define interrupt/prof		(enum interrupt prof))
+(define interrupt/pwr		(enum interrupt pwr))
+(define interrupt/urg		(enum interrupt urg))
+(define interrupt/vtalrm	(enum interrupt vtalrm))
+(define interrupt/winch		(enum interrupt winch))
+(define interrupt/xcpu		(enum interrupt xcpu))
+(define interrupt/xfsz		(enum interrupt xfsz))
+
+(define interrupt/int	interrupt/keyboard)
+(define interrupt/alrm	interrupt/alarm)
+
 
 ;;; Get/Set signal handlers
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -76,44 +101,42 @@
 (define-foreign %do-default-sigaction (do_default_sigaction (fixnum signal))
   ignore)
 
-;;; This gives the default handler for each signal.
-(define default-handler-vec
-  (initialize-vector 32 (lambda (sig)
-			  ;; This is the guy to call when you want signal
-			  ;; SIG handled in the default manner.
-			  (if (memv sig signals-ignored-by-default)
-			      (lambda (enabled-interrupts) #f)
-			      (lambda (enabled-interrupts)
-				(%do-default-sigaction sig))))))
-
+(define default-int-handler-vec
+  ;; Non-Unix-signal interrupts just get their default values from
+  ;; the current value of I-H.
+  (let ((v (copy-vector interrupt-handlers)))
+    (do ((sig 31 (- sig 1)))			; For each Unix signal
+	((< sig 0))				; make & install a default
+      (let ((i (%signal->interrupt sig)))	; signal handler.
+	(if (>= i 0)	; Don't mess with non-signal interrupts.
+	    (vector-set! v i (if (memv sig signals-ignored-by-default)
+				 (lambda (enabled-interrupts) #f)
+				 (lambda (enabled-interrupts)
+				   (%do-default-sigaction sig)))))))
+    v))
 
 ;;; HANDLER is #f (ignore), #t (default), or a procedure taking an integer
 ;;; argument. The interrupt is delivered to a procedure by (1) setting the
 ;;; ENABLED-INTERRUPTS register to 0 (i.e., blocking all interrupts), and (2)
 ;;; applying the procedure to the previous value of the ENABLED-INTERRUPTS
-;;; register. If the procedure returns normally (i.e., it doesn't throw to a
-;;; continuation), the ENABLED-INTERRUPTS register will be restored to its
-;;; previous value.
+;;; register. If the procedure returns normally, the ENABLED-INTERRUPTS 
+;;; register will be restored to its previous value.
 
 ;;; This handler does nothing -- used when the handler is #f.
 (define (noop-sig-handler enabled-interrupts) #f)
 
-(define (set-signal-handler! sig handler)
-  (let ((nhandler (case handler
-		    ((#t) (vector-ref default-handler-vec sig))
-		    ((#f) noop-sig-handler)
-		    (else handler)))
-	(int (signal->interrupt sig)))
-    (with-enabled-interrupts 0
-      (let ((ohandler (vector-ref interrupt-handlers int)))
-	(vector-set! interrupt-handlers int nhandler)
-	(cond ((eq? ohandler (vector-ref default-handler-vec sig)) #t)
-	      ((eq? ohandler noop-sig-handler) #f)
-	      (else ohandler))))))
+(define (set-interrupt-handler! int handler)
+  (let ((ohandler (interrupt-handler int)))
+    (vector-set! interrupt-handlers int
+		 (case handler
+		   ((#t) (vector-ref default-int-handler-vec int))
+		   ((#f) noop-sig-handler)
+		   (else handler)))
+    ohandler))
 
-(define (signal-handler sig)
-  (let ((handler (vector-ref interrupt-handlers (signal->interrupt sig))))
-    (cond ((eq? handler (vector-ref default-handler-vec sig)) #t)
+(define (interrupt-handler int)
+  (let ((handler (vector-ref interrupt-handlers int)))
+    (cond ((eq? handler (vector-ref default-int-handler-vec int)) #t)
 	  ((eq? handler noop-sig-handler) #f)
 	  (else handler))))
 
@@ -166,6 +189,8 @@
   (do ((sig 32 (- sig 1)))
       ((< sig 0))
     (let ((i (%signal->interrupt sig)))
-      (if (not (or (= i -1) (= sig signal/int) (= sig signal/alrm)))
+      (if (not (or (= i -1)
+		   (= sig signal/int)		; Leave ^c and
+		   (= sig signal/alrm)))	; alarm handlers alone.
 	  (vector-set! interrupt-handlers i
-		       (vector-ref default-handler-vec sig))))))
+		       (vector-ref default-int-handler-vec i))))))

scsh/sighandlers1.c

@@ -12,6 +12,9 @@
 /* Make sure our exports match up w/the implementation: */
 #include "sighandlers1.h"
 
+/* Import the OS-dependent set of signals and their translations
+** to S48 vm interrupts.
+*/
 #include "signals1.h"
 
 extern int errno;
@@ -63,7 +66,7 @@ int get_procmask(int *old_lo_p)
 
 static void scm_handle_sig(int sig)
 {
-  /* fprintf(stderr, "scm_handle_sig(%d)\n", sig); */
+  /*fprintf(stderr, "scm_handle_sig(%d) = int %d\n", sig, sig2int[sig]);*/
   Spending_interruptsS |= (1<<sig2int[sig]);
   }
 
@@ -169,6 +172,7 @@ void install_scsh_handlers(void)
 
   sigemptyset(&new.sa_mask); /* WTF */
   new.sa_handler = scm_handle_sig;
+  new.sa_flags = 0;
 
   for(i=max_sig; i>=0; i--)
     if( sig2int[i] ) {

scsh/signals1.h

@@ -1,4 +1,4 @@
 /* Exports from signals1.c */
 
-const int sig2int[];
-const int max_sig;
+extern const int sig2int[];
+extern const int max_sig;