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f7c9d7b698
* ser-unix.c (do_unix_readchar): Prevent infinite read wait to be interrupted after 32K seconds.
1322 lines
30 KiB
C
1322 lines
30 KiB
C
/* Serial interface for local (hardwired) serial ports on Un*x like systems
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Copyright 1992-1994, 1998-2000 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "serial.h"
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#include "ser-unix.h"
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#include <fcntl.h>
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#include <sys/types.h>
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#include "terminal.h"
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#include "gdb_wait.h"
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#include <sys/socket.h>
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#include <sys/time.h>
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#include "gdb_string.h"
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#include "event-loop.h"
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#ifdef HAVE_TERMIOS
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struct hardwire_ttystate
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{
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struct termios termios;
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};
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#endif /* termios */
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#ifdef HAVE_TERMIO
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/* It is believed that all systems which have added job control to SVR3
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(e.g. sco) have also added termios. Even if not, trying to figure out
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all the variations (TIOCGPGRP vs. TCGETPGRP, etc.) would be pretty
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bewildering. So we don't attempt it. */
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struct hardwire_ttystate
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{
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struct termio termio;
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};
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#endif /* termio */
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#ifdef HAVE_SGTTY
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struct hardwire_ttystate
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{
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struct sgttyb sgttyb;
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struct tchars tc;
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struct ltchars ltc;
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/* Line discipline flags. */
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int lmode;
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};
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#endif /* sgtty */
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static int hardwire_open (serial_t scb, const char *name);
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static void hardwire_raw (serial_t scb);
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static int wait_for (serial_t scb, int timeout);
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static int hardwire_readchar (serial_t scb, int timeout);
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static int do_hardwire_readchar (serial_t scb, int timeout);
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static int generic_readchar (serial_t scb, int timeout, int (*do_readchar) (serial_t scb, int timeout));
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static int rate_to_code (int rate);
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static int hardwire_setbaudrate (serial_t scb, int rate);
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static void hardwire_close (serial_t scb);
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static int get_tty_state (serial_t scb, struct hardwire_ttystate * state);
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static int set_tty_state (serial_t scb, struct hardwire_ttystate * state);
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static serial_ttystate hardwire_get_tty_state (serial_t scb);
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static int hardwire_set_tty_state (serial_t scb, serial_ttystate state);
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static int hardwire_noflush_set_tty_state (serial_t, serial_ttystate,
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serial_ttystate);
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static void hardwire_print_tty_state (serial_t, serial_ttystate, struct ui_file *);
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static int hardwire_drain_output (serial_t);
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static int hardwire_flush_output (serial_t);
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static int hardwire_flush_input (serial_t);
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static int hardwire_send_break (serial_t);
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static int hardwire_setstopbits (serial_t, int);
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static int do_unix_readchar (serial_t scb, int timeout);
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static timer_handler_func push_event;
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static handler_func fd_event;
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static void reschedule (serial_t scb);
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void _initialize_ser_hardwire (void);
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extern int (*ui_loop_hook) (int);
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/* Open up a real live device for serial I/O */
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static int
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hardwire_open (serial_t scb, const char *name)
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{
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scb->fd = open (name, O_RDWR);
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if (scb->fd < 0)
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return -1;
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return 0;
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}
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static int
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get_tty_state (serial_t scb, struct hardwire_ttystate *state)
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{
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#ifdef HAVE_TERMIOS
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if (tcgetattr (scb->fd, &state->termios) < 0)
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return -1;
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return 0;
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#endif
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#ifdef HAVE_TERMIO
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if (ioctl (scb->fd, TCGETA, &state->termio) < 0)
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return -1;
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return 0;
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#endif
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#ifdef HAVE_SGTTY
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if (ioctl (scb->fd, TIOCGETP, &state->sgttyb) < 0)
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return -1;
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if (ioctl (scb->fd, TIOCGETC, &state->tc) < 0)
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return -1;
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if (ioctl (scb->fd, TIOCGLTC, &state->ltc) < 0)
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return -1;
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if (ioctl (scb->fd, TIOCLGET, &state->lmode) < 0)
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return -1;
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return 0;
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#endif
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}
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static int
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set_tty_state (serial_t scb, struct hardwire_ttystate *state)
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{
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#ifdef HAVE_TERMIOS
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if (tcsetattr (scb->fd, TCSANOW, &state->termios) < 0)
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return -1;
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return 0;
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#endif
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#ifdef HAVE_TERMIO
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if (ioctl (scb->fd, TCSETA, &state->termio) < 0)
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return -1;
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return 0;
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#endif
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#ifdef HAVE_SGTTY
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if (ioctl (scb->fd, TIOCSETN, &state->sgttyb) < 0)
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return -1;
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if (ioctl (scb->fd, TIOCSETC, &state->tc) < 0)
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return -1;
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if (ioctl (scb->fd, TIOCSLTC, &state->ltc) < 0)
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return -1;
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if (ioctl (scb->fd, TIOCLSET, &state->lmode) < 0)
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return -1;
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return 0;
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#endif
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}
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static serial_ttystate
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hardwire_get_tty_state (serial_t scb)
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{
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struct hardwire_ttystate *state;
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state = (struct hardwire_ttystate *) xmalloc (sizeof *state);
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if (get_tty_state (scb, state))
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return NULL;
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return (serial_ttystate) state;
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}
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static int
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hardwire_set_tty_state (serial_t scb, serial_ttystate ttystate)
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{
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struct hardwire_ttystate *state;
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state = (struct hardwire_ttystate *) ttystate;
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return set_tty_state (scb, state);
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}
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static int
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hardwire_noflush_set_tty_state (serial_t scb,
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serial_ttystate new_ttystate,
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serial_ttystate old_ttystate)
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{
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struct hardwire_ttystate new_state;
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#ifdef HAVE_SGTTY
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struct hardwire_ttystate *state = (struct hardwire_ttystate *) old_ttystate;
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#endif
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new_state = *(struct hardwire_ttystate *) new_ttystate;
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/* Don't change in or out of raw mode; we don't want to flush input.
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termio and termios have no such restriction; for them flushing input
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is separate from setting the attributes. */
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#ifdef HAVE_SGTTY
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if (state->sgttyb.sg_flags & RAW)
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new_state.sgttyb.sg_flags |= RAW;
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else
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new_state.sgttyb.sg_flags &= ~RAW;
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/* I'm not sure whether this is necessary; the manpage just mentions
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RAW not CBREAK. */
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if (state->sgttyb.sg_flags & CBREAK)
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new_state.sgttyb.sg_flags |= CBREAK;
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else
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new_state.sgttyb.sg_flags &= ~CBREAK;
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#endif
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return set_tty_state (scb, &new_state);
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}
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static void
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hardwire_print_tty_state (serial_t scb,
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serial_ttystate ttystate,
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struct ui_file *stream)
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{
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struct hardwire_ttystate *state = (struct hardwire_ttystate *) ttystate;
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int i;
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#ifdef HAVE_TERMIOS
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fprintf_filtered (stream, "c_iflag = 0x%x, c_oflag = 0x%x,\n",
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(int) state->termios.c_iflag,
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(int) state->termios.c_oflag);
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fprintf_filtered (stream, "c_cflag = 0x%x, c_lflag = 0x%x\n",
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(int) state->termios.c_cflag,
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(int) state->termios.c_lflag);
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#if 0
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/* This not in POSIX, and is not really documented by those systems
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which have it (at least not Sun). */
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fprintf_filtered (stream, "c_line = 0x%x.\n", state->termios.c_line);
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#endif
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fprintf_filtered (stream, "c_cc: ");
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for (i = 0; i < NCCS; i += 1)
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fprintf_filtered (stream, "0x%x ", state->termios.c_cc[i]);
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fprintf_filtered (stream, "\n");
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#endif
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#ifdef HAVE_TERMIO
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fprintf_filtered (stream, "c_iflag = 0x%x, c_oflag = 0x%x,\n",
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state->termio.c_iflag, state->termio.c_oflag);
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fprintf_filtered (stream, "c_cflag = 0x%x, c_lflag = 0x%x, c_line = 0x%x.\n",
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state->termio.c_cflag, state->termio.c_lflag,
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state->termio.c_line);
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fprintf_filtered (stream, "c_cc: ");
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for (i = 0; i < NCC; i += 1)
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fprintf_filtered (stream, "0x%x ", state->termio.c_cc[i]);
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fprintf_filtered (stream, "\n");
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#endif
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#ifdef HAVE_SGTTY
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fprintf_filtered (stream, "sgttyb.sg_flags = 0x%x.\n",
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state->sgttyb.sg_flags);
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fprintf_filtered (stream, "tchars: ");
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for (i = 0; i < (int) sizeof (struct tchars); i++)
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fprintf_filtered (stream, "0x%x ", ((unsigned char *) &state->tc)[i]);
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fprintf_filtered ("\n");
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fprintf_filtered (stream, "ltchars: ");
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for (i = 0; i < (int) sizeof (struct ltchars); i++)
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fprintf_filtered (stream, "0x%x ", ((unsigned char *) &state->ltc)[i]);
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fprintf_filtered (stream, "\n");
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fprintf_filtered (stream, "lmode: 0x%x\n", state->lmode);
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#endif
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}
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/* Wait for the output to drain away, as opposed to flushing (discarding) it */
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static int
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hardwire_drain_output (serial_t scb)
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{
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#ifdef HAVE_TERMIOS
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return tcdrain (scb->fd);
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#endif
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#ifdef HAVE_TERMIO
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return ioctl (scb->fd, TCSBRK, 1);
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#endif
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#ifdef HAVE_SGTTY
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/* Get the current state and then restore it using TIOCSETP,
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which should cause the output to drain and pending input
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to be discarded. */
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{
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struct hardwire_ttystate state;
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if (get_tty_state (scb, &state))
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{
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return (-1);
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}
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else
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{
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return (ioctl (scb->fd, TIOCSETP, &state.sgttyb));
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}
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}
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#endif
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}
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static int
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hardwire_flush_output (serial_t scb)
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{
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#ifdef HAVE_TERMIOS
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return tcflush (scb->fd, TCOFLUSH);
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#endif
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#ifdef HAVE_TERMIO
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return ioctl (scb->fd, TCFLSH, 1);
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#endif
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#ifdef HAVE_SGTTY
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/* This flushes both input and output, but we can't do better. */
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return ioctl (scb->fd, TIOCFLUSH, 0);
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#endif
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}
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static int
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hardwire_flush_input (serial_t scb)
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{
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ser_unix_flush_input (scb);
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#ifdef HAVE_TERMIOS
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return tcflush (scb->fd, TCIFLUSH);
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#endif
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#ifdef HAVE_TERMIO
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return ioctl (scb->fd, TCFLSH, 0);
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#endif
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#ifdef HAVE_SGTTY
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/* This flushes both input and output, but we can't do better. */
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return ioctl (scb->fd, TIOCFLUSH, 0);
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#endif
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}
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static int
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hardwire_send_break (serial_t scb)
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{
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#ifdef HAVE_TERMIOS
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return tcsendbreak (scb->fd, 0);
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#endif
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#ifdef HAVE_TERMIO
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return ioctl (scb->fd, TCSBRK, 0);
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#endif
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#ifdef HAVE_SGTTY
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{
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int status;
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struct timeval timeout;
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status = ioctl (scb->fd, TIOCSBRK, 0);
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/* Can't use usleep; it doesn't exist in BSD 4.2. */
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/* Note that if this select() is interrupted by a signal it will not wait
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the full length of time. I think that is OK. */
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timeout.tv_sec = 0;
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timeout.tv_usec = 250000;
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select (0, 0, 0, 0, &timeout);
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status = ioctl (scb->fd, TIOCCBRK, 0);
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return status;
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}
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#endif
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}
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static void
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hardwire_raw (serial_t scb)
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{
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struct hardwire_ttystate state;
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if (get_tty_state (scb, &state))
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fprintf_unfiltered (gdb_stderr, "get_tty_state failed: %s\n", safe_strerror (errno));
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#ifdef HAVE_TERMIOS
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state.termios.c_iflag = 0;
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state.termios.c_oflag = 0;
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state.termios.c_lflag = 0;
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state.termios.c_cflag &= ~(CSIZE | PARENB);
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state.termios.c_cflag |= CLOCAL | CS8;
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state.termios.c_cc[VMIN] = 0;
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state.termios.c_cc[VTIME] = 0;
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#endif
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#ifdef HAVE_TERMIO
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state.termio.c_iflag = 0;
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state.termio.c_oflag = 0;
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state.termio.c_lflag = 0;
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state.termio.c_cflag &= ~(CSIZE | PARENB);
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state.termio.c_cflag |= CLOCAL | CS8;
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state.termio.c_cc[VMIN] = 0;
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state.termio.c_cc[VTIME] = 0;
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#endif
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#ifdef HAVE_SGTTY
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state.sgttyb.sg_flags |= RAW | ANYP;
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state.sgttyb.sg_flags &= ~(CBREAK | ECHO);
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#endif
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scb->current_timeout = 0;
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if (set_tty_state (scb, &state))
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fprintf_unfiltered (gdb_stderr, "set_tty_state failed: %s\n", safe_strerror (errno));
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}
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|
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/* Wait for input on scb, with timeout seconds. Returns 0 on success,
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otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
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||
|
||
For termio{s}, we actually just setup VTIME if necessary, and let the
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timeout occur in the read() in hardwire_read().
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*/
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|
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/* FIXME: cagney/1999-09-16: Don't replace this with the equivalent
|
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ser_unix*() until the old TERMIOS/SGTTY/... timer code has been
|
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flushed. . */
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|
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/* NOTE: cagney/1999-09-30: Much of the code below is dead. The only
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possible values of the TIMEOUT parameter are ONE and ZERO.
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Consequently all the code that tries to handle the possability of
|
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an overflowed timer is unnecessary. */
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||
|
||
static int
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wait_for (serial_t scb, int timeout)
|
||
{
|
||
#ifdef HAVE_SGTTY
|
||
{
|
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struct timeval tv;
|
||
fd_set readfds;
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||
|
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FD_ZERO (&readfds);
|
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|
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tv.tv_sec = timeout;
|
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tv.tv_usec = 0;
|
||
|
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FD_SET (scb->fd, &readfds);
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||
|
||
while (1)
|
||
{
|
||
int numfds;
|
||
|
||
if (timeout >= 0)
|
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numfds = select (scb->fd + 1, &readfds, 0, 0, &tv);
|
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else
|
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numfds = select (scb->fd + 1, &readfds, 0, 0, 0);
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|
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if (numfds <= 0)
|
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if (numfds == 0)
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return SERIAL_TIMEOUT;
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else if (errno == EINTR)
|
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continue;
|
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else
|
||
return SERIAL_ERROR; /* Got an error from select or poll */
|
||
|
||
return 0;
|
||
}
|
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}
|
||
#endif /* HAVE_SGTTY */
|
||
|
||
#if defined HAVE_TERMIO || defined HAVE_TERMIOS
|
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if (timeout == scb->current_timeout)
|
||
return 0;
|
||
|
||
scb->current_timeout = timeout;
|
||
|
||
{
|
||
struct hardwire_ttystate state;
|
||
|
||
if (get_tty_state (scb, &state))
|
||
fprintf_unfiltered (gdb_stderr, "get_tty_state failed: %s\n", safe_strerror (errno));
|
||
|
||
#ifdef HAVE_TERMIOS
|
||
if (timeout < 0)
|
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{
|
||
/* No timeout. */
|
||
state.termios.c_cc[VTIME] = 0;
|
||
state.termios.c_cc[VMIN] = 1;
|
||
}
|
||
else
|
||
{
|
||
state.termios.c_cc[VMIN] = 0;
|
||
state.termios.c_cc[VTIME] = timeout * 10;
|
||
if (state.termios.c_cc[VTIME] != timeout * 10)
|
||
{
|
||
|
||
/* If c_cc is an 8-bit signed character, we can't go
|
||
bigger than this. If it is always unsigned, we could use
|
||
25. */
|
||
|
||
scb->current_timeout = 12;
|
||
state.termios.c_cc[VTIME] = scb->current_timeout * 10;
|
||
scb->timeout_remaining = timeout - scb->current_timeout;
|
||
}
|
||
}
|
||
#endif
|
||
|
||
#ifdef HAVE_TERMIO
|
||
if (timeout < 0)
|
||
{
|
||
/* No timeout. */
|
||
state.termio.c_cc[VTIME] = 0;
|
||
state.termio.c_cc[VMIN] = 1;
|
||
}
|
||
else
|
||
{
|
||
state.termio.c_cc[VMIN] = 0;
|
||
state.termio.c_cc[VTIME] = timeout * 10;
|
||
if (state.termio.c_cc[VTIME] != timeout * 10)
|
||
{
|
||
/* If c_cc is an 8-bit signed character, we can't go
|
||
bigger than this. If it is always unsigned, we could use
|
||
25. */
|
||
|
||
scb->current_timeout = 12;
|
||
state.termio.c_cc[VTIME] = scb->current_timeout * 10;
|
||
scb->timeout_remaining = timeout - scb->current_timeout;
|
||
}
|
||
}
|
||
#endif
|
||
|
||
if (set_tty_state (scb, &state))
|
||
fprintf_unfiltered (gdb_stderr, "set_tty_state failed: %s\n", safe_strerror (errno));
|
||
|
||
return 0;
|
||
}
|
||
#endif /* HAVE_TERMIO || HAVE_TERMIOS */
|
||
}
|
||
|
||
/* Read a character with user-specified timeout. TIMEOUT is number of seconds
|
||
to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
|
||
char if successful. Returns SERIAL_TIMEOUT if timeout expired, EOF if line
|
||
dropped dead, or SERIAL_ERROR for any other error (see errno in that case). */
|
||
|
||
/* FIXME: cagney/1999-09-16: Don't replace this with the equivalent
|
||
ser_unix*() until the old TERMIOS/SGTTY/... timer code has been
|
||
flushed. */
|
||
|
||
/* NOTE: cagney/1999-09-16: This function is not identical to
|
||
ser_unix_readchar() as part of replacing it with ser_unix*()
|
||
merging will be required - this code handles the case where read()
|
||
times out due to no data while ser_unix_readchar() doesn't expect
|
||
that. */
|
||
|
||
static int
|
||
do_hardwire_readchar (serial_t scb, int timeout)
|
||
{
|
||
int status, delta;
|
||
int detach = 0;
|
||
|
||
if (timeout > 0)
|
||
timeout++;
|
||
|
||
/* We have to be able to keep the GUI alive here, so we break the original
|
||
timeout into steps of 1 second, running the "keep the GUI alive" hook
|
||
each time through the loop.
|
||
Also, timeout = 0 means to poll, so we just set the delta to 0, so we
|
||
will only go through the loop once. */
|
||
|
||
delta = (timeout == 0 ? 0 : 1);
|
||
while (1)
|
||
{
|
||
|
||
/* N.B. The UI may destroy our world (for instance by calling
|
||
remote_stop,) in which case we want to get out of here as
|
||
quickly as possible. It is not safe to touch scb, since
|
||
someone else might have freed it. The ui_loop_hook signals that
|
||
we should exit by returning 1. */
|
||
|
||
if (ui_loop_hook)
|
||
detach = ui_loop_hook (0);
|
||
|
||
if (detach)
|
||
return SERIAL_TIMEOUT;
|
||
|
||
scb->timeout_remaining = (timeout < 0 ? timeout : timeout - delta);
|
||
status = wait_for (scb, delta);
|
||
|
||
if (status < 0)
|
||
return status;
|
||
|
||
status = read (scb->fd, scb->buf, BUFSIZ);
|
||
|
||
if (status <= 0)
|
||
{
|
||
if (status == 0)
|
||
{
|
||
/* Zero characters means timeout (it could also be EOF, but
|
||
we don't (yet at least) distinguish). */
|
||
if (scb->timeout_remaining > 0)
|
||
{
|
||
timeout = scb->timeout_remaining;
|
||
continue;
|
||
}
|
||
else if (scb->timeout_remaining < 0)
|
||
continue;
|
||
else
|
||
return SERIAL_TIMEOUT;
|
||
}
|
||
else if (errno == EINTR)
|
||
continue;
|
||
else
|
||
return SERIAL_ERROR; /* Got an error from read */
|
||
}
|
||
|
||
scb->bufcnt = status;
|
||
scb->bufcnt--;
|
||
scb->bufp = scb->buf;
|
||
return *scb->bufp++;
|
||
}
|
||
}
|
||
|
||
static int
|
||
hardwire_readchar (serial_t scb, int timeout)
|
||
{
|
||
return generic_readchar (scb, timeout, do_hardwire_readchar);
|
||
}
|
||
|
||
|
||
#ifndef B19200
|
||
#define B19200 EXTA
|
||
#endif
|
||
|
||
#ifndef B38400
|
||
#define B38400 EXTB
|
||
#endif
|
||
|
||
/* Translate baud rates from integers to damn B_codes. Unix should
|
||
have outgrown this crap years ago, but even POSIX wouldn't buck it. */
|
||
|
||
static struct
|
||
{
|
||
int rate;
|
||
int code;
|
||
}
|
||
baudtab[] =
|
||
{
|
||
{
|
||
50, B50
|
||
}
|
||
,
|
||
{
|
||
75, B75
|
||
}
|
||
,
|
||
{
|
||
110, B110
|
||
}
|
||
,
|
||
{
|
||
134, B134
|
||
}
|
||
,
|
||
{
|
||
150, B150
|
||
}
|
||
,
|
||
{
|
||
200, B200
|
||
}
|
||
,
|
||
{
|
||
300, B300
|
||
}
|
||
,
|
||
{
|
||
600, B600
|
||
}
|
||
,
|
||
{
|
||
1200, B1200
|
||
}
|
||
,
|
||
{
|
||
1800, B1800
|
||
}
|
||
,
|
||
{
|
||
2400, B2400
|
||
}
|
||
,
|
||
{
|
||
4800, B4800
|
||
}
|
||
,
|
||
{
|
||
9600, B9600
|
||
}
|
||
,
|
||
{
|
||
19200, B19200
|
||
}
|
||
,
|
||
{
|
||
38400, B38400
|
||
}
|
||
,
|
||
#ifdef B57600
|
||
{
|
||
57600, B57600
|
||
}
|
||
,
|
||
#endif
|
||
#ifdef B115200
|
||
{
|
||
115200, B115200
|
||
}
|
||
,
|
||
#endif
|
||
#ifdef B230400
|
||
{
|
||
230400, B230400
|
||
}
|
||
,
|
||
#endif
|
||
#ifdef B460800
|
||
{
|
||
460800, B460800
|
||
}
|
||
,
|
||
#endif
|
||
{
|
||
-1, -1
|
||
}
|
||
,
|
||
};
|
||
|
||
static int
|
||
rate_to_code (int rate)
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; baudtab[i].rate != -1; i++)
|
||
if (rate == baudtab[i].rate)
|
||
return baudtab[i].code;
|
||
|
||
return -1;
|
||
}
|
||
|
||
static int
|
||
hardwire_setbaudrate (serial_t scb, int rate)
|
||
{
|
||
struct hardwire_ttystate state;
|
||
|
||
if (get_tty_state (scb, &state))
|
||
return -1;
|
||
|
||
#ifdef HAVE_TERMIOS
|
||
cfsetospeed (&state.termios, rate_to_code (rate));
|
||
cfsetispeed (&state.termios, rate_to_code (rate));
|
||
#endif
|
||
|
||
#ifdef HAVE_TERMIO
|
||
#ifndef CIBAUD
|
||
#define CIBAUD CBAUD
|
||
#endif
|
||
|
||
state.termio.c_cflag &= ~(CBAUD | CIBAUD);
|
||
state.termio.c_cflag |= rate_to_code (rate);
|
||
#endif
|
||
|
||
#ifdef HAVE_SGTTY
|
||
state.sgttyb.sg_ispeed = rate_to_code (rate);
|
||
state.sgttyb.sg_ospeed = rate_to_code (rate);
|
||
#endif
|
||
|
||
return set_tty_state (scb, &state);
|
||
}
|
||
|
||
static int
|
||
hardwire_setstopbits (serial_t scb, int num)
|
||
{
|
||
struct hardwire_ttystate state;
|
||
int newbit;
|
||
|
||
if (get_tty_state (scb, &state))
|
||
return -1;
|
||
|
||
switch (num)
|
||
{
|
||
case SERIAL_1_STOPBITS:
|
||
newbit = 0;
|
||
break;
|
||
case SERIAL_1_AND_A_HALF_STOPBITS:
|
||
case SERIAL_2_STOPBITS:
|
||
newbit = 1;
|
||
break;
|
||
default:
|
||
return 1;
|
||
}
|
||
|
||
#ifdef HAVE_TERMIOS
|
||
if (!newbit)
|
||
state.termios.c_cflag &= ~CSTOPB;
|
||
else
|
||
state.termios.c_cflag |= CSTOPB; /* two bits */
|
||
#endif
|
||
|
||
#ifdef HAVE_TERMIO
|
||
if (!newbit)
|
||
state.termio.c_cflag &= ~CSTOPB;
|
||
else
|
||
state.termio.c_cflag |= CSTOPB; /* two bits */
|
||
#endif
|
||
|
||
#ifdef HAVE_SGTTY
|
||
return 0; /* sgtty doesn't support this */
|
||
#endif
|
||
|
||
return set_tty_state (scb, &state);
|
||
}
|
||
|
||
static void
|
||
hardwire_close (serial_t scb)
|
||
{
|
||
if (scb->fd < 0)
|
||
return;
|
||
|
||
close (scb->fd);
|
||
scb->fd = -1;
|
||
}
|
||
|
||
|
||
/* Generic operations used by all UNIX/FD based serial interfaces. */
|
||
|
||
serial_ttystate
|
||
ser_unix_nop_get_tty_state (serial_t scb)
|
||
{
|
||
/* allocate a dummy */
|
||
return (serial_ttystate) XMALLOC (int);
|
||
}
|
||
|
||
int
|
||
ser_unix_nop_set_tty_state (serial_t scb, serial_ttystate ttystate)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
void
|
||
ser_unix_nop_raw (serial_t scb)
|
||
{
|
||
return; /* Always in raw mode */
|
||
}
|
||
|
||
/* Wait for input on scb, with timeout seconds. Returns 0 on success,
|
||
otherwise SERIAL_TIMEOUT or SERIAL_ERROR. */
|
||
|
||
int
|
||
ser_unix_wait_for (serial_t scb, int timeout)
|
||
{
|
||
int numfds;
|
||
struct timeval tv;
|
||
fd_set readfds, exceptfds;
|
||
|
||
FD_ZERO (&readfds);
|
||
FD_ZERO (&exceptfds);
|
||
|
||
tv.tv_sec = timeout;
|
||
tv.tv_usec = 0;
|
||
|
||
FD_SET (scb->fd, &readfds);
|
||
FD_SET (scb->fd, &exceptfds);
|
||
|
||
while (1)
|
||
{
|
||
if (timeout >= 0)
|
||
numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, &tv);
|
||
else
|
||
numfds = select (scb->fd + 1, &readfds, 0, &exceptfds, 0);
|
||
|
||
if (numfds <= 0)
|
||
{
|
||
if (numfds == 0)
|
||
return SERIAL_TIMEOUT;
|
||
else if (errno == EINTR)
|
||
continue;
|
||
else
|
||
return SERIAL_ERROR; /* Got an error from select or poll */
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
/* Read a character with user-specified timeout. TIMEOUT is number of seconds
|
||
to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
|
||
char if successful. Returns -2 if timeout expired, EOF if line dropped
|
||
dead, or -3 for any other error (see errno in that case). */
|
||
|
||
static int
|
||
do_unix_readchar (serial_t scb, int timeout)
|
||
{
|
||
int status;
|
||
int delta;
|
||
|
||
/* We have to be able to keep the GUI alive here, so we break the original
|
||
timeout into steps of 1 second, running the "keep the GUI alive" hook
|
||
each time through the loop.
|
||
|
||
Also, timeout = 0 means to poll, so we just set the delta to 0, so we
|
||
will only go through the loop once. */
|
||
|
||
delta = (timeout == 0 ? 0 : 1);
|
||
while (1)
|
||
{
|
||
|
||
/* N.B. The UI may destroy our world (for instance by calling
|
||
remote_stop,) in which case we want to get out of here as
|
||
quickly as possible. It is not safe to touch scb, since
|
||
someone else might have freed it. The ui_loop_hook signals that
|
||
we should exit by returning 1. */
|
||
|
||
if (ui_loop_hook)
|
||
{
|
||
if (ui_loop_hook (0))
|
||
return SERIAL_TIMEOUT;
|
||
}
|
||
|
||
status = ser_unix_wait_for (scb, delta);
|
||
timeout = (timeout <= 0) ? timeout : (timeout - delta);
|
||
|
||
/* If we got a character or an error back from wait_for, then we can
|
||
break from the loop before the timeout is completed. */
|
||
|
||
if (status != SERIAL_TIMEOUT)
|
||
{
|
||
break;
|
||
}
|
||
|
||
/* If we have exhausted the original timeout, then generate
|
||
a SERIAL_TIMEOUT, and pass it out of the loop. */
|
||
|
||
else if (timeout == 0)
|
||
{
|
||
status = SERIAL_TIMEOUT;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (status < 0)
|
||
return status;
|
||
|
||
while (1)
|
||
{
|
||
status = read (scb->fd, scb->buf, BUFSIZ);
|
||
if (status != -1 || errno != EINTR)
|
||
break;
|
||
}
|
||
|
||
if (status <= 0)
|
||
{
|
||
if (status == 0)
|
||
return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to
|
||
distinguish between EOF & timeouts
|
||
someday] */
|
||
else
|
||
return SERIAL_ERROR; /* Got an error from read */
|
||
}
|
||
|
||
scb->bufcnt = status;
|
||
scb->bufcnt--;
|
||
scb->bufp = scb->buf;
|
||
return *scb->bufp++;
|
||
}
|
||
|
||
/* Perform operations common to both old and new readchar. */
|
||
|
||
/* Return the next character from the input FIFO. If the FIFO is
|
||
empty, call the SERIAL specific routine to try and read in more
|
||
characters.
|
||
|
||
Initially data from the input FIFO is returned (fd_event()
|
||
pre-reads the input into that FIFO. Once that has been emptied,
|
||
further data is obtained by polling the input FD using the device
|
||
specific readchar() function. Note: reschedule() is called after
|
||
every read. This is because there is no guarentee that the lower
|
||
level fd_event() poll_event() code (which also calls reschedule())
|
||
will be called. */
|
||
|
||
static int
|
||
generic_readchar (serial_t scb, int timeout,
|
||
int (do_readchar) (serial_t scb, int timeout))
|
||
{
|
||
int ch;
|
||
if (scb->bufcnt > 0)
|
||
{
|
||
ch = *scb->bufp;
|
||
scb->bufcnt--;
|
||
scb->bufp++;
|
||
}
|
||
else if (scb->bufcnt < 0)
|
||
{
|
||
/* Some errors/eof are are sticky. */
|
||
ch = scb->bufcnt;
|
||
}
|
||
else
|
||
{
|
||
ch = do_readchar (scb, timeout);
|
||
if (ch < 0)
|
||
{
|
||
switch ((enum serial_rc) ch)
|
||
{
|
||
case SERIAL_EOF:
|
||
case SERIAL_ERROR:
|
||
/* Make the error/eof stick. */
|
||
scb->bufcnt = ch;
|
||
break;
|
||
case SERIAL_TIMEOUT:
|
||
scb->bufcnt = 0;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
reschedule (scb);
|
||
return ch;
|
||
}
|
||
|
||
int
|
||
ser_unix_readchar (serial_t scb, int timeout)
|
||
{
|
||
return generic_readchar (scb, timeout, do_unix_readchar);
|
||
}
|
||
|
||
int
|
||
ser_unix_nop_noflush_set_tty_state (serial_t scb,
|
||
serial_ttystate new_ttystate,
|
||
serial_ttystate old_ttystate)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
void
|
||
ser_unix_nop_print_tty_state (serial_t scb,
|
||
serial_ttystate ttystate,
|
||
struct ui_file *stream)
|
||
{
|
||
/* Nothing to print. */
|
||
return;
|
||
}
|
||
|
||
int
|
||
ser_unix_nop_setbaudrate (serial_t scb, int rate)
|
||
{
|
||
return 0; /* Never fails! */
|
||
}
|
||
|
||
int
|
||
ser_unix_nop_setstopbits (serial_t scb, int num)
|
||
{
|
||
return 0; /* Never fails! */
|
||
}
|
||
|
||
int
|
||
ser_unix_write (serial_t 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_unix_nop_flush_output (serial_t scb)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
ser_unix_flush_input (serial_t scb)
|
||
{
|
||
if (scb->bufcnt >= 0)
|
||
{
|
||
scb->bufcnt = 0;
|
||
scb->bufp = scb->buf;
|
||
return 0;
|
||
}
|
||
else
|
||
return SERIAL_ERROR;
|
||
}
|
||
|
||
int
|
||
ser_unix_nop_send_break (serial_t scb)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
ser_unix_nop_drain_output (serial_t scb)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
|
||
|
||
/* 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. */
|
||
|
||
static void
|
||
reschedule (serial_t 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)
|
||
{
|
||
serial_t 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)
|
||
{
|
||
serial_t scb = context;
|
||
scb->async_state = NOTHING_SCHEDULED; /* Timers are one-off */
|
||
scb->async_handler (scb, scb->async_context);
|
||
/* re-schedule */
|
||
reschedule (scb);
|
||
}
|
||
|
||
/* Put the SERIAL device into/out-of ASYNC mode. */
|
||
|
||
void
|
||
ser_unix_async (serial_t 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 what ever tasks are currently scheduled. */
|
||
switch (scb->async_state)
|
||
{
|
||
case FD_SCHEDULED:
|
||
delete_file_handler (scb->fd);
|
||
break;
|
||
NOTHING_SCHEDULED:
|
||
break;
|
||
default: /* TIMER SCHEDULED */
|
||
delete_timer (scb->async_state);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
void
|
||
_initialize_ser_hardwire (void)
|
||
{
|
||
struct serial_ops *ops = XMALLOC (struct serial_ops);
|
||
memset (ops, sizeof (struct serial_ops), 0);
|
||
ops->name = "hardwire";
|
||
ops->next = 0;
|
||
ops->open = hardwire_open;
|
||
ops->close = hardwire_close;
|
||
/* FIXME: Don't replace this with the equivalent ser_unix*() until
|
||
the old TERMIOS/SGTTY/... timer code has been flushed. cagney
|
||
1999-09-16. */
|
||
ops->readchar = hardwire_readchar;
|
||
ops->write = ser_unix_write;
|
||
ops->flush_output = hardwire_flush_output;
|
||
ops->flush_input = hardwire_flush_input;
|
||
ops->send_break = hardwire_send_break;
|
||
ops->go_raw = hardwire_raw;
|
||
ops->get_tty_state = hardwire_get_tty_state;
|
||
ops->set_tty_state = hardwire_set_tty_state;
|
||
ops->print_tty_state = hardwire_print_tty_state;
|
||
ops->noflush_set_tty_state = hardwire_noflush_set_tty_state;
|
||
ops->setbaudrate = hardwire_setbaudrate;
|
||
ops->setstopbits = hardwire_setstopbits;
|
||
ops->drain_output = hardwire_drain_output;
|
||
ops->async = ser_unix_async;
|
||
serial_add_interface (ops);
|
||
}
|