-typedef void (file_handler_func) PARAMS ((gdb_client_data, int mask));
-typedef void (async_handler_func) PARAMS ((gdb_client_data));
-typedef void (event_handler_func) PARAMS ((int));
-
-/* Event for the GDB event system. Events are queued by calling
- async_queue_event and serviced later on by gdb_do_one_event. An
- event can be, for instance, a file descriptor becoming ready to be
- read. Servicing an event simply means that the procedure PROC will
- be called. We have 2 queues, one for file handlers that we listen
- to in the event loop, and one for the file handlers+events that are
- ready. The procedure PROC associated with each event is always the
- same (handle_file_event). Its duty is to invoke the handler
- associated with the file descriptor whose state change generated
- the event, plus doing other cleanups adn such. */
-
-struct gdb_event
- {
- event_handler_func *proc; /* Procedure to call to service this event. */
- int fd; /* File descriptor that is ready. */
- struct gdb_event *next_event; /* Next in list of events or NULL. */
- };
-
-/* Information about each file descriptor we register with the event
- loop. */
-
-typedef struct file_handler
- {
- int fd; /* File descriptor. */
- int mask; /* Events we want to monitor: POLLIN, etc. */
- int ready_mask; /* Events that have been seen since
- the last time. */
- file_handler_func *proc; /* Procedure to call when fd is ready. */
- gdb_client_data client_data; /* Argument to pass to proc. */
- struct file_handler *next_file; /* Next registered file descriptor. */
- }
-file_handler;
-
-/* PROC is a function to be invoked when the READY flag is set. This
- happens when there has been a signal and the corresponding signal
- handler has 'triggered' this async_signal_handler for
- execution. The actual work to be done in response to a signal will
- be carried out by PROC at a later time, within process_event. This
- provides a deferred execution of signal handlers.
- Async_init_signals takes care of setting up such an
- asyn_signal_handler for each interesting signal. */
-
-typedef struct async_signal_handler
- {
- int ready; /* If ready, call this handler from the main event loop,
- using invoke_async_handler. */
- struct async_signal_handler *next_handler; /* Ptr to next handler */
- async_handler_func *proc; /* Function to call to do the work */
- gdb_client_data client_data; /* Argument to async_handler_func */
- }
-async_signal_handler;
-
-/* Where to add an event onto the event queue, by queue_event. */
-typedef enum
- {
- /* Add at tail of queue. It will be processed in first in first
- out order. */
- TAIL,
- /* Add at head of queue. It will be processed in last in first out
- order. */
- HEAD
- }
-queue_position;
-
-/* Tell create_file_handler what events we are interested in.
- This is used by the select version of the event loop. */
-
-#define GDB_READABLE (1<<1)
-#define GDB_WRITABLE (1<<2)
-#define GDB_EXCEPTION (1<<3)
-
-/* Type of the mask arguments to select. */
-
-#ifndef NO_FD_SET
-#define SELECT_MASK fd_set
-#else
-#ifndef _AIX
-typedef long fd_mask;
-#endif
-#if defined(_IBMR2)
-#define SELECT_MASK void
-#else
-#define SELECT_MASK int
-#endif
-#endif
-
-/* Define "NBBY" (number of bits per byte) if it's not already defined. */
-
-#ifndef NBBY
-#define NBBY 8
-#endif
-
-
-/* Define the number of fd_masks in an fd_set */