+++ /dev/null
-/* Generic serial interface functions.
-
- Copyright 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001,
- 2003, 2004, 2005 Free Software Foundation, Inc.
-
- This file is part of GDB.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
-
-#include "defs.h"
-#include "serial.h"
-#include "ser-unix.h"
-#include "event-loop.h"
-
-static timer_handler_func push_event;
-static handler_func fd_event;
-
-/* Event handling for ASYNC serial code.
-
- At any time the SERIAL device either: has an empty FIFO and is
- waiting on a FD event; or has a non-empty FIFO/error condition and
- is constantly scheduling timer events.
-
- ASYNC only stops pestering its client when it is de-async'ed or it
- is told to go away. */
-
-/* Value of scb->async_state: */
-enum {
- /* >= 0 (TIMER_SCHEDULED) */
- /* The ID of the currently scheduled timer event. This state is
- rarely encountered. Timer events are one-off so as soon as the
- event is delivered the state is shanged to NOTHING_SCHEDULED. */
- FD_SCHEDULED = -1,
- /* The fd_event() handler is scheduled. It is called when ever the
- file descriptor becomes ready. */
- NOTHING_SCHEDULED = -2
- /* Either no task is scheduled (just going into ASYNC mode) or a
- timer event has just gone off and the current state has been
- forced into nothing scheduled. */
-};
-
-/* Identify and schedule the next ASYNC task based on scb->async_state
- and scb->buf* (the input FIFO). A state machine is used to avoid
- the need to make redundant calls into the event-loop - the next
- scheduled task is only changed when needed. */
-
-void
-reschedule (struct serial *scb)
-{
- if (serial_is_async_p (scb))
- {
- int next_state;
- switch (scb->async_state)
- {
- case FD_SCHEDULED:
- if (scb->bufcnt == 0)
- next_state = FD_SCHEDULED;
- else
- {
- delete_file_handler (scb->fd);
- next_state = create_timer (0, push_event, scb);
- }
- break;
- case NOTHING_SCHEDULED:
- if (scb->bufcnt == 0)
- {
- add_file_handler (scb->fd, fd_event, scb);
- next_state = FD_SCHEDULED;
- }
- else
- {
- next_state = create_timer (0, push_event, scb);
- }
- break;
- default: /* TIMER SCHEDULED */
- if (scb->bufcnt == 0)
- {
- delete_timer (scb->async_state);
- add_file_handler (scb->fd, fd_event, scb);
- next_state = FD_SCHEDULED;
- }
- else
- next_state = scb->async_state;
- break;
- }
- if (serial_debug_p (scb))
- {
- switch (next_state)
- {
- case FD_SCHEDULED:
- if (scb->async_state != FD_SCHEDULED)
- fprintf_unfiltered (gdb_stdlog, "[fd%d->fd-scheduled]\n",
- scb->fd);
- break;
- default: /* TIMER SCHEDULED */
- if (scb->async_state == FD_SCHEDULED)
- fprintf_unfiltered (gdb_stdlog, "[fd%d->timer-scheduled]\n",
- scb->fd);
- break;
- }
- }
- scb->async_state = next_state;
- }
-}
-
-/* FD_EVENT: This is scheduled when the input FIFO is empty (and there
- is no pending error). As soon as data arrives, it is read into the
- input FIFO and the client notified. The client should then drain
- the FIFO using readchar(). If the FIFO isn't immediatly emptied,
- push_event() is used to nag the client until it is. */
-
-static void
-fd_event (int error, void *context)
-{
- struct serial *scb = context;
- if (error != 0)
- {
- scb->bufcnt = SERIAL_ERROR;
- }
- else if (scb->bufcnt == 0)
- {
- /* Prime the input FIFO. The readchar() function is used to
- pull characters out of the buffer. See also
- generic_readchar(). */
- int nr;
- do
- {
- nr = read (scb->fd, scb->buf, BUFSIZ);
- }
- while (nr == -1 && errno == EINTR);
- if (nr == 0)
- {
- scb->bufcnt = SERIAL_EOF;
- }
- else if (nr > 0)
- {
- scb->bufcnt = nr;
- scb->bufp = scb->buf;
- }
- else
- {
- scb->bufcnt = SERIAL_ERROR;
- }
- }
- scb->async_handler (scb, scb->async_context);
- reschedule (scb);
-}
-
-/* PUSH_EVENT: The input FIFO is non-empty (or there is a pending
- error). Nag the client until all the data has been read. In the
- case of errors, the client will need to close or de-async the
- device before naging stops. */
-
-static void
-push_event (void *context)
-{
- struct serial *scb = context;
- scb->async_state = NOTHING_SCHEDULED; /* Timers are one-off */
- scb->async_handler (scb, scb->async_context);
- /* re-schedule */
- reschedule (scb);
-}
-
-int
-ser_base_write (struct serial *scb, const char *str, int len)
-{
- int cc;
-
- while (len > 0)
- {
- cc = write (scb->fd, str, len);
-
- if (cc < 0)
- return 1;
- len -= cc;
- str += cc;
- }
- return 0;
-}
-
-int
-ser_base_flush_output (struct serial *scb)
-{
- return 0;
-}
-
-int
-ser_base_flush_input (struct serial *scb)
-{
- if (scb->bufcnt >= 0)
- {
- scb->bufcnt = 0;
- scb->bufp = scb->buf;
- return 0;
- }
- else
- return SERIAL_ERROR;
-}
-
-int
-ser_base_send_break (struct serial *scb)
-{
- return 0;
-}
-
-int
-ser_base_drain_output (struct serial *scb)
-{
- return 0;
-}
-
-void
-ser_base_raw (struct serial *scb)
-{
- return; /* Always in raw mode */
-}
-
-serial_ttystate
-ser_base_get_tty_state (struct serial *scb)
-{
- /* allocate a dummy */
- return (serial_ttystate) XMALLOC (int);
-}
-
-int
-ser_base_set_tty_state (struct serial *scb, serial_ttystate ttystate)
-{
- return 0;
-}
-
-int
-ser_base_noflush_set_tty_state (struct serial *scb,
- serial_ttystate new_ttystate,
- serial_ttystate old_ttystate)
-{
- return 0;
-}
-
-void
-ser_base_print_tty_state (struct serial *scb,
- serial_ttystate ttystate,
- struct ui_file *stream)
-{
- /* Nothing to print. */
- return;
-}
-
-int
-ser_base_setbaudrate (struct serial *scb, int rate)
-{
- return 0; /* Never fails! */
-}
-
-int
-ser_base_setstopbits (struct serial *scb, int num)
-{
- return 0; /* Never fails! */
-}
-
-/* Put the SERIAL device into/out-of ASYNC mode. */
-
-void
-ser_base_async (struct serial *scb,
- int async_p)
-{
- if (async_p)
- {
- /* Force a re-schedule. */
- scb->async_state = NOTHING_SCHEDULED;
- if (serial_debug_p (scb))
- fprintf_unfiltered (gdb_stdlog, "[fd%d->asynchronous]\n",
- scb->fd);
- reschedule (scb);
- }
- else
- {
- if (serial_debug_p (scb))
- fprintf_unfiltered (gdb_stdlog, "[fd%d->synchronous]\n",
- scb->fd);
- /* De-schedule whatever tasks are currently scheduled. */
- switch (scb->async_state)
- {
- case FD_SCHEDULED:
- delete_file_handler (scb->fd);
- break;
- case NOTHING_SCHEDULED:
- break;
- default: /* TIMER SCHEDULED */
- delete_timer (scb->async_state);
- break;
- }
- }
-}
+++ /dev/null
-/* Generic serial interface functions.
-
- Copyright 2005 Free Software Foundation, Inc.
-
- This file is part of GDB.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
-
-#ifndef SER_BASE_H
-#define SER_BASE_H
-
-struct serial;
-struct ui_file;
-
-extern void reschedule (struct serial *scb);
-extern int ser_base_flush_output (struct serial *scb);
-extern int ser_base_flush_input (struct serial *scb);
-extern int ser_base_send_break (struct serial *scb);
-extern void ser_base_raw (struct serial *scb);
-extern serial_ttystate ser_base_get_tty_state (struct serial *scb);
-extern int ser_base_set_tty_state (struct serial *scb,
- serial_ttystate ttystate);
-extern void ser_base_print_tty_state (struct serial *scb,
- serial_ttystate ttystate,
- struct ui_file *stream);
-extern int ser_base_noflush_set_tty_state (struct serial *scb,
- serial_ttystate new_ttystate,
- serial_ttystate old_ttystate);
-extern int ser_base_setbaudrate (struct serial *scb, int rate);
-extern int ser_base_setstopbits (struct serial *scb, int rate);
-extern int ser_base_drain_output (struct serial *scb);
-
-extern int ser_base_write (struct serial *scb, const char *str, int len);
-
-extern void ser_base_async (struct serial *scb, int async_p);
-
-#endif
projects / thirdparty / binutils-gdb.git / commitdiff
