(in-package "SB!UNIX")
-(defun invoke-interruption (function)
- (without-interrupts
- (sb!unix::reset-signal-mask)
- (funcall function)))
+(defmacro with-interrupt-bindings (&body body)
+ `(let
+ ;; KLUDGE: Whatever is on the PCL stacks before the interrupt
+ ;; handler runs doesn't really matter, since we're not on the
+ ;; same call stack, really -- and if we don't bind these (esp.
+ ;; the cache one) we can get a bogus metacircle if an interrupt
+ ;; handler calls a GF that was being computed when the interrupt
+ ;; hit.
+ ((sb!pcl::*cache-miss-values-stack* nil)
+ (sb!pcl::*dfun-miss-gfs-on-stack* nil))
+ ,@body))
-(defmacro in-interruption ((&rest args) &body body)
+(defun invoke-interruption (function)
+ (with-interrupt-bindings
+ (without-interrupts
+ ;; Reset signal mask: the C-side handler has blocked all
+ ;; deferrable interrupts before arranging return to lisp. This is
+ ;; safe because we can't get a pending interrupt before we unblock
+ ;; signals.
+ ;;
+ ;; FIXME: Should we not reset the _entire_ mask, but just
+ ;; restore it to the state before we got the interrupt?
+ (reset-signal-mask)
+ (allow-with-interrupts (funcall function)))))
+
+(defmacro in-interruption ((&key) &body body)
#!+sb-doc
"Convenience macro on top of INVOKE-INTERRUPTION."
- `(invoke-interruption (lambda () ,@body) ,@args))
-
-;;; These should probably be somewhere, but I don't know where.
-(defconstant sig_dfl 0)
-(defconstant sig_ign 1)
+ `(dx-flet ((interruption () ,@body))
+ (invoke-interruption #'interruption)))
\f
;;;; system calls that deal with signals
(without-gcing
(let ((result (install-handler signal
(case handler
- (:default sig_dfl)
- (:ignore sig_ign)
+ (:default sig-dfl)
+ (:ignore sig-ign)
(t
(sb!kernel:get-lisp-obj-address
#'run-handler))))))
- (cond ((= result sig_dfl) :default)
- ((= result sig_ign) :ignore)
+ (cond ((= result sig-dfl) :default)
+ ((= result sig-ign) :ignore)
(t (the (or function fixnum)
(sb!kernel:make-lisp-obj result))))))))
;;; *DEBUGGER-HOOK*, but we want SIGINT's BREAK to respect it, so that
;;; SIGINT in --disable-debugger mode will cleanly terminate the system
;;; (by respecting the *DEBUGGER-HOOK* established in that mode).
-(defun sigint-%break (format-string &rest format-arguments)
- (flet ((break-it ()
- (apply #'%break 'sigint format-string format-arguments)))
- (sb!thread:interrupt-thread (sb!thread::foreground-thread) #'break-it)))
-
(eval-when (:compile-toplevel :execute)
- (sb!xc:defmacro define-signal-handler (name
- what
- &optional (function 'error))
+ (sb!xc:defmacro define-signal-handler (name what &optional (function 'error))
`(defun ,name (signal info context)
(declare (ignore signal info))
(declare (type system-area-pointer context))
(with-alien ((context (* os-context-t) context))
(sap-int (sb!vm:context-pc context))))))))
-(define-signal-handler sigint-handler "interrupted" sigint-%break)
(define-signal-handler sigill-handler "illegal instruction")
-(define-signal-handler sigtrap-handler "breakpoint/trap")
#!-linux
(define-signal-handler sigemt-handler "SIGEMT")
(define-signal-handler sigbus-handler "bus error")
#!-linux
(define-signal-handler sigsys-handler "bad argument to a system call")
+(defun sigint-handler (signal info context)
+ (declare (ignore signal info))
+ (declare (type system-area-pointer context))
+ (/show "in Lisp-level SIGINT handler" (sap-int context))
+ (flet ((interrupt-it ()
+ (with-alien ((context (* os-context-t) context))
+ (%break 'sigint 'interactive-interrupt
+ :context context
+ :address (sap-int (sb!vm:context-pc context))))))
+ (sb!thread:interrupt-thread (sb!thread::foreground-thread)
+ #'interrupt-it)))
+
(defun sigalrm-handler (signal info context)
(declare (ignore signal info context))
(declare (type system-area-pointer context))
(enable-interrupt sigint #'sigint-handler)
(enable-interrupt sigterm #'sigterm-handler)
(enable-interrupt sigill #'sigill-handler)
- (enable-interrupt sigtrap #'sigtrap-handler)
(enable-interrupt sigiot #'sigiot-handler)
#!-linux
(enable-interrupt sigemt #'sigemt-handler)
\f
;;;; etc.
+;;; extract si_code from siginfo_t
+(sb!alien:define-alien-routine ("siginfo_code" siginfo-code) sb!alien:int
+ (info system-area-pointer))
+
;;; CMU CL comment:
;;; Magically converted by the compiler into a break instruction.
(defun receive-pending-interrupt ()
(receive-pending-interrupt))
-\f
-;;; stale code which I'm insufficiently motivated to test -- WHN 19990714
-#|
-;;;; WITH-ENABLED-INTERRUPTS
-
-(defmacro with-enabled-interrupts (interrupt-list &body body)
- #!+sb-doc
- "With-enabled-interrupts ({(interrupt function)}*) {form}*
- Establish function as a handler for the Unix signal interrupt which
- should be a number between 1 and 31 inclusive."
- (let ((il (gensym))
- (it (gensym)))
- `(let ((,il NIL))
- (unwind-protect
- (progn
- ,@(do* ((item interrupt-list (cdr item))
- (intr (caar item) (caar item))
- (ifcn (cadar item) (cadar item))
- (forms NIL))
- ((null item) (nreverse forms))
- (when (symbolp intr)
- (setq intr (symbol-value intr)))
- (push `(push `(,,intr ,(enable-interrupt ,intr ,ifcn)) ,il)
- forms))
- ,@body)
- (dolist (,it (nreverse ,il))
- (enable-interrupt (car ,it) (cadr ,it)))))))
-|#
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