diff options
| -rw-r--r-- | gdb/ChangeLog | 15 | ||||
| -rw-r--r-- | gdb/remote.c | 229 |
2 files changed, 241 insertions, 3 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index e84f23f..53d6d5d 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,5 +1,20 @@ 2015-05-12 Don Breazeal <donb@codesourcery.com> + * remote.c (remote_insert_fork_catchpoint): New function. + (remote_remove_fork_catchpoint): New function. + (remote_insert_vfork_catchpoint): New function. + (remote_remove_vfork_catchpoint): New function. + (pending_fork_parent_callback): New function. + (remove_new_fork_child): New function. + (remote_update_thread_list): Call remote_notif_get_pending_events + and remove_new_fork_child. + (extended_remote_kill): Kill fork child when killing the + parent before follow_fork completes. + (init_extended_remote_ops): Initialize target vector with + new fork catchpoint functions. + +2015-05-12 Don Breazeal <donb@codesourcery.com> + * remote.c (remove_vfork_event_p): New function. (remote_follow_fork): Add vfork event type to event checking. (remote_parse_stop_reply): New stop reasons "vfork" and diff --git a/gdb/remote.c b/gdb/remote.c index df8fca3..dfe115b 100644 --- a/gdb/remote.c +++ b/gdb/remote.c @@ -104,6 +104,10 @@ static void remote_open_1 (const char *, int, struct target_ops *, static void remote_close (struct target_ops *self); +struct remote_state; + +static int remote_vkill (int pid, struct remote_state *rs); + static void remote_mourn (struct target_ops *ops); static void extended_remote_restart (void); @@ -181,7 +185,6 @@ static ptid_t read_ptid (char *buf, char **obuf); static void remote_set_permissions (struct target_ops *self); -struct remote_state; static int remote_get_trace_status (struct target_ops *self, struct trace_status *ts); @@ -204,6 +207,9 @@ static void push_stop_reply (struct stop_reply *); static void discard_pending_stop_replies_in_queue (struct remote_state *); static int peek_stop_reply (ptid_t ptid); +struct threads_listing_context; +static void remove_new_fork_children (struct threads_listing_context *); + static void remote_async_inferior_event_handler (gdb_client_data); static void remote_terminal_ours (struct target_ops *self); @@ -1478,6 +1484,46 @@ remote_vfork_event_p (struct remote_state *rs) return packet_support (PACKET_vfork_event_feature) == PACKET_ENABLE; } +/* Insert fork catchpoint target routine. If fork events are enabled + then return success, nothing more to do. */ + +static int +remote_insert_fork_catchpoint (struct target_ops *ops, int pid) +{ + struct remote_state *rs = get_remote_state (); + + return !remote_fork_event_p (rs); +} + +/* Remove fork catchpoint target routine. Nothing to do, just + return success. */ + +static int +remote_remove_fork_catchpoint (struct target_ops *ops, int pid) +{ + return 0; +} + +/* Insert vfork catchpoint target routine. If vfork events are enabled + then return success, nothing more to do. */ + +static int +remote_insert_vfork_catchpoint (struct target_ops *ops, int pid) +{ + struct remote_state *rs = get_remote_state (); + + return !remote_vfork_event_p (rs); +} + +/* Remove vfork catchpoint target routine. Nothing to do, just + return success. */ + +static int +remote_remove_vfork_catchpoint (struct target_ops *ops, int pid) +{ + return 0; +} + /* Tokens for use by the asynchronous signal handlers for SIGINT. */ static struct async_signal_handler *async_sigint_remote_twice_token; static struct async_signal_handler *async_sigint_remote_token; @@ -2645,6 +2691,27 @@ clear_threads_listing_context (void *p) VEC_free (thread_item_t, context->items); } +/* Remove the thread specified as the related_pid field of WS + from the CONTEXT list. */ + +static void +threads_listing_context_remove (struct target_waitstatus *ws, + struct threads_listing_context *context) +{ + struct thread_item *item; + int i; + ptid_t child_ptid = ws->value.related_pid; + + for (i = 0; VEC_iterate (thread_item_t, context->items, i, item); ++i) + { + if (ptid_equal (item->ptid, child_ptid)) + { + VEC_ordered_remove (thread_item_t, context->items, i); + break; + } + } +} + static int remote_newthread_step (threadref *ref, void *data) { @@ -2867,7 +2934,7 @@ remote_update_thread_list (struct target_ops *ops) target end. Delete GDB-side threads no longer found on the target. */ ALL_THREADS_SAFE (tp, tmp) - { + { for (i = 0; VEC_iterate (thread_item_t, context.items, i, item); ++i) @@ -2881,7 +2948,12 @@ remote_update_thread_list (struct target_ops *ops) /* Not found. */ delete_thread (tp->ptid); } - } + } + + /* Remove any unreported fork child threads from CONTEXT so + that we don't interfere with follow fork, which is where + creation of such threads is handled. */ + remove_new_fork_children (&context); /* And now add threads we don't know about yet to our list. */ for (i = 0; @@ -5427,6 +5499,81 @@ struct queue_iter_param struct stop_reply *output; }; +/* Determine if THREAD is a pending fork parent thread. ARG contains + the pid of the process that owns the threads we want to check, or + -1 if we want to check all threads. */ + +static int +is_pending_fork_parent (struct target_waitstatus *ws, int event_pid, + ptid_t thread_ptid) +{ + if (ws->kind == TARGET_WAITKIND_FORKED + || ws->kind == TARGET_WAITKIND_VFORKED) + { + if (event_pid == -1 || event_pid == ptid_get_pid (thread_ptid)) + return 1; + } + + return 0; +} + +/* Check whether EVENT is a fork event, and if it is, remove the + fork child from the context list passed in DATA. */ + +static int +remove_child_of_pending_fork (QUEUE (stop_reply_p) *q, + QUEUE_ITER (stop_reply_p) *iter, + stop_reply_p event, + void *data) +{ + struct queue_iter_param *param = data; + struct threads_listing_context *context = param->input; + + if (event->ws.kind == TARGET_WAITKIND_FORKED + || event->ws.kind == TARGET_WAITKIND_VFORKED) + { + threads_listing_context_remove (&event->ws, context); + } + + return 1; +} + +/* If CONTEXT contains any fork child threads that have not been + reported yet, remove them from the CONTEXT list. If such a + thread exists it is because we are stopped at a fork catchpoint + and have not yet called follow_fork, which will set up the + host-side data structures for the new process. */ + +static void +remove_new_fork_children (struct threads_listing_context *context) +{ + struct thread_info * thread; + int pid = -1; + struct notif_client *notif = ¬if_client_stop; + struct queue_iter_param param; + + /* For any threads stopped at a fork event, remove the corresponding + fork child threads from the CONTEXT list. */ + ALL_NON_EXITED_THREADS (thread) + { + struct target_waitstatus *ws = &thread->pending_follow; + + if (is_pending_fork_parent (ws, pid, thread->ptid)) + { + threads_listing_context_remove (ws, context); + } + } + + /* Check for any pending fork events (not reported or processed yet) + in process PID and remove those fork child threads from the + CONTEXT list as well. */ + remote_notif_get_pending_events (notif); + param.input = context; + param.output = NULL; + QUEUE_iterate (stop_reply_p, stop_reply_queue, + remove_child_of_pending_fork, ¶m); +} + /* Remove stop replies in the queue if its pid is equal to the given inferior's pid. */ @@ -7945,6 +8092,69 @@ getpkt_or_notif_sane (char **buf, long *sizeof_buf, int forever, is_notif); } +/* Check whether EVENT is a fork event for the process specified + by the pid passed in DATA, and if it is, kill the fork child. */ + +static int +kill_child_of_pending_fork (QUEUE (stop_reply_p) *q, + QUEUE_ITER (stop_reply_p) *iter, + stop_reply_p event, + void *data) +{ + struct queue_iter_param *param = data; + int parent_pid = *(int *) param->input; + + if (is_pending_fork_parent (&event->ws, parent_pid, event->ptid)) + { + struct remote_state *rs = get_remote_state (); + int child_pid = ptid_get_pid (event->ws.value.related_pid); + int res; + + res = remote_vkill (child_pid, rs); + if (res != 0) + error (_("Can't kill fork child process %d"), child_pid); + } + + return 1; +} + +/* Kill any new fork children of process PID that haven't been + processed by follow_fork. */ + +static void +kill_new_fork_children (int pid, struct remote_state *rs) +{ + struct thread_info *thread; + struct notif_client *notif = ¬if_client_stop; + struct queue_iter_param param; + + /* Kill the fork child threads of any threads in process PID + that are stopped at a fork event. */ + ALL_NON_EXITED_THREADS (thread) + { + struct target_waitstatus *ws = &thread->pending_follow; + + if (is_pending_fork_parent (ws, pid, thread->ptid)) + { + struct remote_state *rs = get_remote_state (); + int child_pid = ptid_get_pid (ws->value.related_pid); + int res; + + res = remote_vkill (child_pid, rs); + if (res != 0) + error (_("Can't kill fork child process %d"), child_pid); + } + } + + /* Check for any pending fork events (not reported or processed yet) + in process PID and kill those fork child threads as well. */ + remote_notif_get_pending_events (notif); + param.input = &pid; + param.output = NULL; + QUEUE_iterate (stop_reply_p, stop_reply_queue, + kill_child_of_pending_fork, ¶m); +} + static void remote_kill (struct target_ops *ops) @@ -8014,6 +8224,11 @@ extended_remote_kill (struct target_ops *ops) int pid = ptid_get_pid (inferior_ptid); struct remote_state *rs = get_remote_state (); + /* If we're stopped while forking and we haven't followed yet, kill the + child task. We need to do this before killing the parent task + because if this is a vfork then the parent will be sleeping. */ + kill_new_fork_children (pid, rs); + res = remote_vkill (pid, rs); if (res == -1 && !(rs->extended && remote_multi_process_p (rs))) { @@ -11970,6 +12185,14 @@ Specify the serial device it is connected to (e.g. /dev/ttya)."; extended_remote_ops.to_supports_disable_randomization = extended_remote_supports_disable_randomization; extended_remote_ops.to_follow_fork = remote_follow_fork; + extended_remote_ops.to_insert_fork_catchpoint + = remote_insert_fork_catchpoint; + extended_remote_ops.to_remove_fork_catchpoint + = remote_remove_fork_catchpoint; + extended_remote_ops.to_insert_vfork_catchpoint + = remote_insert_vfork_catchpoint; + extended_remote_ops.to_remove_vfork_catchpoint + = remote_remove_vfork_catchpoint; } static int |