inf-ptrace: Add an event_pipe to be used for async mode in subclasses.

Subclasses of inf_ptrace_target have to opt-in to using the event_pipe
by implementing the can_async_p and async methods.  For subclasses
which do this, inf_ptrace_target provides is_async_p, async_wait_fd
and closes the pipe in the close target method.

inf_ptrace_target also provides wrapper routines around the event pipe
(async_file_open, async_file_close, async_file_flush, and
async_file_mark) for use in target methods such as async.
inf_ptrace_target also exports a static async_file_mark_if_open
function which can be used in SIGCHLD signal handlers.

1 files changed, 0 insertions, 4 deletions

diff --git a/gdb/fbsd-nat.h b/gdb/fbsd-nat.h
index 0acfef2..2d9c6e1 100644
--- a/gdb/fbsd-nat.h
+++ b/gdb/fbsd-nat.h
@@ -67,13 +67,9 @@ public:
   void update_thread_list () override;
 
   bool can_async_p () override;
-  bool is_async_p () override;
 
-  int async_wait_fd () override;
   void async (int) override;
 
-  void close () override;
-
   thread_control_capabilities get_thread_control_capabilities () override
   { return tc_schedlock; }