2010-05-18 Hui Zhu <teawater@gmail.com>

	* linux-fork.c (inferior_call_waitpid_cleanup): Add check
	for oldfp.
	(inferior_call_waitpid): Move make_cleanup out of check.
	Check the return of waitpid.
	(delete_checkpoint_command): Add pptid to save fi->parent_ptid.

1 files changed, 20 insertions, 15 deletions

diff --git a/gdb/linux-fork.c b/gdb/linux-fork.c
index 9d20128a351..d9463bd9aa4 100644
--- a/gdb/linux-fork.c
+++ b/gdb/linux-fork.c
@@ -417,10 +417,13 @@ inferior_call_waitpid_cleanup (void *fp)
 {
   struct fork_info *oldfp = fp;
 
-  /* Switch back to inferior_ptid. */
-  remove_breakpoints ();
-  fork_load_infrun_state (oldfp);
-  insert_breakpoints ();
+  if (oldfp)
+    {
+      /* Switch back to inferior_ptid. */
+      remove_breakpoints ();
+      fork_load_infrun_state (oldfp);
+      insert_breakpoints ();
+    }
 }
 
 static int
@@ -428,10 +431,10 @@ inferior_call_waitpid (ptid_t pptid, int pid)
 {
   struct objfile *waitpid_objf;
   struct value *waitpid_fn = NULL;
-  struct value *argv[4];
+  struct value *argv[4], *retv;
   struct gdbarch *gdbarch = get_current_arch ();
   struct fork_info *oldfp = NULL, *newfp = NULL;
-  struct cleanup *old_cleanup = NULL;
+  struct cleanup *old_cleanup;
   int ret = -1;
 
   if (!ptid_equal (pptid, inferior_ptid))
@@ -445,10 +448,10 @@ inferior_call_waitpid (ptid_t pptid, int pid)
       remove_breakpoints ();
       fork_load_infrun_state (newfp);
       insert_breakpoints ();
-
-      old_cleanup = make_cleanup (inferior_call_waitpid_cleanup, oldfp);
     }
 
+  old_cleanup = make_cleanup (inferior_call_waitpid_cleanup, oldfp);
+
   /* Get the waitpid_fn.  */
   if (lookup_minimal_symbol ("waitpid", NULL, NULL) != NULL)
     waitpid_fn = find_function_in_inferior ("waitpid", &waitpid_objf);
@@ -463,13 +466,14 @@ inferior_call_waitpid (ptid_t pptid, int pid)
   argv[2] = value_from_longest (builtin_type (gdbarch)->builtin_int, 0);
   argv[3] = 0;
 
-  call_function_by_hand (waitpid_fn, 3, argv);
+  retv = call_function_by_hand (waitpid_fn, 3, argv);
+  if (value_as_long (retv) < 0)
+    goto out;
 
   ret = 0;
 
 out:
-  if (old_cleanup)
-    do_cleanups (old_cleanup);
+  do_cleanups (old_cleanup);
   return ret;
 }
 
@@ -478,7 +482,7 @@ out:
 static void
 delete_checkpoint_command (char *args, int from_tty)
 {
-  ptid_t ptid;
+  ptid_t ptid, pptid;
   struct fork_info *fi;
 
   if (!args || !*args)
@@ -497,6 +501,7 @@ Please switch to another checkpoint before deleting the current one"));
 
   fi = find_fork_ptid (ptid);
   gdb_assert (fi);
+  pptid = fi->parent_ptid;
 
   if (from_tty)
     printf_filtered (_("Killed %s\n"), target_pid_to_str (ptid));
@@ -507,10 +512,10 @@ Please switch to another checkpoint before deleting the current one"));
      list, waitpid the ptid.
      If fi->parent_ptid is a part of lwp and it is stoped, waitpid the
      ptid.  */
-  if ((!find_thread_ptid (fi->parent_ptid) && find_fork_ptid (fi->parent_ptid))
-      || (find_thread_ptid (fi->parent_ptid) && is_stopped (fi->parent_ptid)))
+  if ((!find_thread_ptid (pptid) && find_fork_ptid (pptid))
+      || (find_thread_ptid (pptid) && is_stopped (pptid)))
     {
-      if (inferior_call_waitpid (fi->parent_ptid, PIDGET (ptid)))
+      if (inferior_call_waitpid (pptid, PIDGET (ptid)))
         warning (_("Unable to wait pid %s"), target_pid_to_str (ptid));
     }
 }