Sun Apr 2 13:13:52 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>

	* sysdeps/mach/hurd/i386/trampoline.c: Add a link to
 	SS->active_resources, so that _hurdsig_longjmp_from_handler will
 	be called when a longjmp unwinds the signal frame.
	* sysdeps/mach/hurd/i386/sigreturn.c: Remove the link on the
 	SS->active_resources chain added by _hurd_setup_sighandler.
	* hurd/sigunwind.c: New file.
	* hurd/Makefile (sig): Add sigunwind.

	* Makerules (lib%.so: lib%_pic.a): Remove dir name from $*.

	* MakeTAGS (tags-sources): Include $(all-dist).
	[subdir] (all-dist): Define to $(distribute).

2 files changed, 26 insertions, 0 deletions

diff --git a/sysdeps/mach/hurd/i386/sigreturn.c b/sysdeps/mach/hurd/i386/sigreturn.c
index 19ba1d4..d00fa77 100644
--- a/sysdeps/mach/hurd/i386/sigreturn.c
+++ b/sysdeps/mach/hurd/i386/sigreturn.c
@@ -28,6 +28,7 @@ int
 __sigreturn (struct sigcontext *scp)
 {
   struct hurd_sigstate *ss;
+  struct hurd_userlink *link = (void *) &scp[1];
   mach_port_t *reply_port;
 
   if (scp == NULL || (scp->sc_mask & _SIG_CANT_MASK))
@@ -39,6 +40,11 @@ __sigreturn (struct sigcontext *scp)
   ss = _hurd_self_sigstate ();
   __spin_lock (&ss->lock);
 
+  /* Remove the link on the `active resources' chain added by
+     _hurd_setup_sighandler.  Its purpose was to make sure
+     that we got called; now we have, it is done.  */
+  _hurd_userlink_unlink (link);
+
   /* Restore the set of blocked signals, and the intr_port slot.  */
   ss->blocked = scp->sc_mask;
   ss->intr_port = scp->sc_intr_port;
diff --git a/sysdeps/mach/hurd/i386/trampoline.c b/sysdeps/mach/hurd/i386/trampoline.c
index a83a8a8..5f3361b 100644
--- a/sysdeps/mach/hurd/i386/trampoline.c
+++ b/sysdeps/mach/hurd/i386/trampoline.c
@@ -18,6 +18,7 @@ not, write to the Free Software Foundation, Inc., 675 Mass Ave,
 Cambridge, MA 02139, USA.  */
 
 #include <hurd/signal.h>
+#include <hurd/userlink.h>
 #include "thread_state.h"
 #include <assert.h>
 #include <errno.h>
@@ -55,6 +56,7 @@ _hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler,
       void *sigreturn_returns_here;
       struct sigcontext *return_scp; /* Same; arg to sigreturn.  */
       struct sigcontext ctx;
+      struct hurd_userlink link;
     } *stackframe;
 
   if (ss->context)
@@ -118,6 +120,24 @@ _hurd_setup_sighandler (struct hurd_sigstate *ss, __sighandler_t handler,
     {
       int ok;
 
+      extern void _hurdsig_longjmp_from_handler (void *, jmp_buf, int);
+
+      /* Add a link to the thread's active-resources list.  We mark this as
+	 the only user of the "resource", so the cleanup function will be
+	 called by any longjmp which is unwinding past the signal frame.
+	 The cleanup function (in sigunwind.c) will make sure that all the
+	 appropriate cleanups done by sigreturn are taken care of.  */
+      stackframe->link.cleanup = &_hurdsig_longjmp_from_handler;
+      stackframe->link.cleanup_data = &stackframe->ctx;
+      stackframe->link.resource.next = NULL;
+      stackframe->link.resource.prevp = NULL;
+      stackframe->link.thread.next = ss->active_resources;
+      stackframe->link.thread.prevp = &ss->active_resources;
+      if (stackframe->link.thread.next)
+	stackframe->link.thread.next->thread.prevp
+	  = &stackframe->link.thread.next;
+      ss->active_resources = &stackframe->link;
+
       /* Set up the arguments for the signal handler.  */
       stackframe->signo = signo;
       stackframe->sigcode = sigcode;