diff -rN -p -u old-gnumach/ddb/db_break.c new-gnumach/ddb/db_break.c
--- old-gnumach/ddb/db_break.c	2008-07-18 09:04:51.000000000 -0400
+++ new-gnumach/ddb/db_break.c	2008-07-18 09:04:51.000000000 -0400
@@ -264,7 +264,7 @@ db_check_breakpoint_valid()
 	}
 }
 
-void
+db_breakpoint_t
 db_set_breakpoint(task, addr, count, thread, task_bpt)
 	task_t		task;
 	db_addr_t	addr;
@@ -281,17 +281,17 @@ db_set_breakpoint(task, addr, count, thr
 	    if (thread == THREAD_NULL
 		|| db_find_thread_breakpoint(bkpt, thread)) {
 		db_printf("Already set.\n");
-		return;
+		return NULL;
 	    }
 	} else {
 	    if (!DB_CHECK_ACCESS(addr, BKPT_SIZE, task)) {
 		db_printf("Cannot set break point at %X\n", addr);
-		return;
+		return NULL;
 	    }
 	    alloc_bkpt = bkpt = db_breakpoint_alloc();
 	    if (bkpt == 0) {
 		db_printf("Too many breakpoints.\n");
-		return;
+		return NULL;
 	    }
 	    bkpt->task = task;
 	    bkpt->flags = (task && thread == THREAD_NULL)?
@@ -306,11 +306,13 @@ db_set_breakpoint(task, addr, count, thr
 	    if (alloc_bkpt)
 		db_breakpoint_free(alloc_bkpt);
 	    db_printf("Too many thread_breakpoints.\n");
+	    return NULL;
 	} else {
 	    db_printf("set breakpoint #%d\n", db_breakpoint_number);
 	    if (alloc_bkpt) {
 		bkpt->link = db_breakpoint_list;
 		db_breakpoint_list = bkpt;
 	    }
+	    return bkpt;
 	}
 }
--- old-gnumach/ddb/db_break.h	2008-07-18 09:04:51.000000000 -0400
+++ new-gnumach/ddb/db_break.h	2008-07-18 09:04:51.000000000 -0400
@@ -64,6 +64,7 @@ struct db_breakpoint {
 #define BKPT_USR_GLOBAL		0x8	/* global user space break point */
 #define BKPT_SET_IN_MEM		0x10	/* break point is set in memory */
 #define BKPT_1ST_SET		0x20	/* 1st time set of user global bkpt */
+#define BKPT_EXTERNAL           0x40    /* break point is not from ddb */
 	vm_size_t	bkpt_inst;	/* saved instruction at bkpt */
 	struct db_breakpoint *link;	/* link in in-use or free chain */
 };
@@ -83,4 +84,8 @@ extern db_breakpoint_t	db_set_temp_break
 extern void		db_delete_temp_breakpoint
 					( task_t task, db_breakpoint_t bkpt);
 
+extern db_breakpoint_t  db_set_breakpoint(task_t task, db_addr_t addr, 
+					  int count, thread_t thread, 
+					  boolean_t task_bpt);
+
 #endif	/* _DDB_DB_BREAK_H_ */