751 lines
17 KiB
C
751 lines
17 KiB
C
/* Serial interface for local (hardwired) serial ports on Un*x like systems
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Copyright 1992, 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#include "serial.h"
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#include <fcntl.h>
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#include <sys/types.h>
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#if !defined (HAVE_TERMIOS) && !defined (HAVE_TERMIO) && !defined (HAVE_SGTTY)
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#define HAVE_SGTTY
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#endif
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#ifdef HAVE_TERMIOS
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#include <termios.h>
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#include <unistd.h>
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struct hardwire_ttystate
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{
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struct termios termios;
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pid_t process_group;
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};
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#endif /* termios */
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#ifdef HAVE_TERMIO
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#include <termio.h>
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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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/* Needed for the code which uses select(). We would include <sys/select.h>
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too if it existed on all systems. */
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#include <sys/time.h>
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#include <sgtty.h>
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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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#ifdef SHORT_PGRP
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/* This is only used for the ultra. Does it have pid_t? */
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short process_group;
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#else
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int process_group;
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#endif
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};
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#endif /* sgtty */
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static int hardwire_open PARAMS ((serial_t scb, const char *name));
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static void hardwire_raw PARAMS ((serial_t scb));
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static int wait_for PARAMS ((serial_t scb, int timeout));
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static int hardwire_readchar PARAMS ((serial_t scb, int timeout));
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static int rate_to_code PARAMS ((int rate));
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static int hardwire_setbaudrate PARAMS ((serial_t scb, int rate));
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static int hardwire_write PARAMS ((serial_t scb, const char *str, int len));
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/* FIXME: static void hardwire_restore PARAMS ((serial_t scb)); */
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static void hardwire_close PARAMS ((serial_t scb));
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static int get_tty_state PARAMS ((serial_t scb, struct hardwire_ttystate *state));
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static int set_tty_state PARAMS ((serial_t scb, struct hardwire_ttystate *state));
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static serial_ttystate hardwire_get_tty_state PARAMS ((serial_t scb));
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static int hardwire_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
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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(scb, name)
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serial_t scb;
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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(scb, state)
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serial_t scb;
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struct hardwire_ttystate *state;
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{
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#ifdef HAVE_TERMIOS
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extern int errno;
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pid_t new_process_group;
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if (tcgetattr(scb->fd, &state->termios) < 0)
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return -1;
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if (!job_control)
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return 0;
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/* Apparently, if a tty has no process group, then tcgetpgrp returns -1 with
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errno == 0. In this case, set the process group to -1 so that we know to
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omit resetting it later. */
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new_process_group = tcgetpgrp (scb->fd);
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if ((new_process_group == (pid_t)-1)
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&& (errno != ENOTTY))
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return -1;
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errno = 0;
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state->process_group = new_process_group;
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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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if (!job_control)
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return 0;
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return ioctl (scb->fd, TIOCGPGRP, &state->process_group);
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#endif
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}
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static int
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set_tty_state(scb, state)
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serial_t scb;
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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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if (!job_control)
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return 0;
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/* If the tty had no process group before, then do not reset it. */
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if (state->process_group == -1)
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return 0;
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else
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return tcsetpgrp (scb->fd, state->process_group);
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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 (!job_control)
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return 0;
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return ioctl (scb->fd, TIOCSPGRP, &state->process_group);
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#endif
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}
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static serial_ttystate
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hardwire_get_tty_state(scb)
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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(scb, ttystate)
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serial_t scb;
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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 (scb, new_ttystate, old_ttystate)
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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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struct hardwire_ttystate *state = (struct hardwire_ttystate *) old_ttystate;
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new_state = *(struct hardwire_ttystate *)new_ttystate;
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#ifdef HAVE_TERMIOS
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/* I'm not sure whether this is necessary; the manpage makes no mention
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of discarding input when switching to/from ICANON. */
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if (state->termios.c_lflag & ICANON)
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new_state.termios.c_lflag |= ICANON;
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else
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new_state.termios.c_lflag &= ~ICANON;
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#endif
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#ifdef HAVE_TERMIO
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/* I'm not sure whether this is necessary; the manpage makes no mention
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of discarding input when switching to/from ICANON. */
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if (state->termio.c_lflag & ICANON)
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new_state.termio.c_lflag |= ICANON;
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else
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new_state.termio.c_lflag &= ~ICANON;
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#endif
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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 (scb, ttystate)
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serial_t scb;
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serial_ttystate ttystate;
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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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printf_filtered ("Process group = %d\n", state->process_group);
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printf_filtered ("c_iflag = 0x%x, c_oflag = 0x%x,\n",
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state->termios.c_iflag, state->termios.c_oflag);
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printf_filtered ("c_cflag = 0x%x, c_lflag = 0x%x\n",
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state->termios.c_cflag, 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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printf_filtered ("c_line = 0x%x.\n", state->termios.c_line);
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#endif
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printf_filtered ("c_cc: ");
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for (i = 0; i < NCCS; i += 1)
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printf_filtered ("0x%x ", state->termios.c_cc[i]);
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printf_filtered ("\n");
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#endif
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#ifdef HAVE_TERMIO
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printf_filtered ("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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printf_filtered ("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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printf_filtered ("c_cc: ");
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for (i = 0; i < NCC; i += 1)
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printf_filtered ("0x%x ", state->termio.c_cc[i]);
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printf_filtered ("\n");
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#endif
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#ifdef HAVE_SGTTY
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printf_filtered ("Process group = %d\n", state->process_group);
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printf_filtered ("sgttyb.sg_flags = 0x%x.\n", state->sgttyb.sg_flags);
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printf_filtered ("tchars: ");
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for (i = 0; i < (int)sizeof (struct tchars); i++)
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printf_filtered ("0x%x ", ((unsigned char *)&state->tc)[i]);
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printf_filtered ("\n");
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printf_filtered ("ltchars: ");
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for (i = 0; i < (int)sizeof (struct ltchars); i++)
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printf_filtered ("0x%x ", ((unsigned char *)&state->ltc)[i]);
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printf_filtered ("\n");
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printf_filtered ("lmode: 0x%x\n", state->lmode);
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#endif
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}
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static int
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hardwire_flush_output (scb)
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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 (scb)
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serial_t scb;
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{
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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 (scb)
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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(scb)
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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(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 |= 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 |= 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(stderr, "set_tty_state failed: %s\n", safe_strerror(errno));
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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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static int
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wait_for(scb, timeout)
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serial_t scb;
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int timeout;
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{
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#ifdef HAVE_SGTTY
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struct timeval tv;
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fd_set readfds;
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FD_ZERO (&readfds);
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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)
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{
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int numfds;
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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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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
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return SERIAL_ERROR; /* Got an error from select or poll */
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return 0;
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}
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#endif /* HAVE_SGTTY */
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#if defined HAVE_TERMIO || defined HAVE_TERMIOS
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if (timeout == scb->current_timeout)
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return 0;
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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(stderr, "get_tty_state failed: %s\n", safe_strerror(errno));
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#ifdef HAVE_TERMIOS
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state.termios.c_cc[VTIME] = timeout * 10;
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#endif
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#ifdef HAVE_TERMIO
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state.termio.c_cc[VTIME] = timeout * 10;
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#endif
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scb->current_timeout = timeout;
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if (set_tty_state (scb, &state))
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fprintf(stderr, "set_tty_state failed: %s\n", safe_strerror(errno));
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return 0;
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}
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#endif /* HAVE_TERMIO || HAVE_TERMIOS */
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}
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/* Read a character with user-specified timeout. TIMEOUT is number of seconds
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to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
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char if successful. Returns SERIAL_TIMEOUT if timeout expired, EOF if line
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dropped dead, or SERIAL_ERROR for any other error (see errno in that case). */
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static int
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hardwire_readchar(scb, timeout)
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serial_t scb;
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int timeout;
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{
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int status;
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if (scb->bufcnt-- > 0)
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return *scb->bufp++;
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status = wait_for(scb, timeout);
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if (status < 0)
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return status;
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scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ);
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if (scb->bufcnt <= 0)
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if (scb->bufcnt == 0)
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return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to
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distinguish between EOF & timeouts
|
|
someday] */
|
|
else
|
|
return SERIAL_ERROR; /* Got an error from read */
|
|
|
|
scb->bufcnt--;
|
|
scb->bufp = scb->buf;
|
|
return *scb->bufp++;
|
|
}
|
|
|
|
#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},
|
|
{-1, -1},
|
|
};
|
|
|
|
static int
|
|
rate_to_code(rate)
|
|
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(scb, rate)
|
|
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_set_process_group (scb, ttystate, group)
|
|
serial_t scb;
|
|
serial_ttystate ttystate;
|
|
int group;
|
|
{
|
|
#if defined (HAVE_SGTTY) || defined (HAVE_TERMIOS)
|
|
((struct hardwire_ttystate *)ttystate)->process_group = group;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
hardwire_write(scb, str, len)
|
|
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;
|
|
}
|
|
|
|
static void
|
|
hardwire_close(scb)
|
|
serial_t scb;
|
|
{
|
|
if (scb->fd < 0)
|
|
return;
|
|
|
|
close(scb->fd);
|
|
scb->fd = -1;
|
|
}
|
|
|
|
static struct serial_ops hardwire_ops =
|
|
{
|
|
"hardwire",
|
|
0,
|
|
hardwire_open,
|
|
hardwire_close,
|
|
hardwire_readchar,
|
|
hardwire_write,
|
|
hardwire_flush_output,
|
|
hardwire_flush_input,
|
|
hardwire_send_break,
|
|
hardwire_raw,
|
|
hardwire_get_tty_state,
|
|
hardwire_set_tty_state,
|
|
hardwire_print_tty_state,
|
|
hardwire_noflush_set_tty_state,
|
|
hardwire_setbaudrate,
|
|
hardwire_set_process_group
|
|
};
|
|
|
|
int job_control;
|
|
#if defined (HAVE_TERMIOS)
|
|
#include <unistd.h>
|
|
#endif
|
|
|
|
/* This is here because this is where we figure out whether we (probably)
|
|
have job control. Just using job_control only does part of it because
|
|
setpgid or setpgrp might not exist on a system without job control.
|
|
It might be considered misplaced (on the other hand, process groups and
|
|
job control are closely related to ttys).
|
|
|
|
For a more clean implementation, in libiberty, put a setpgid which merely
|
|
calls setpgrp and a setpgrp which does nothing (any system with job control
|
|
will have one or the other). */
|
|
int
|
|
gdb_setpgid ()
|
|
{
|
|
int retval = 0;
|
|
if (job_control)
|
|
{
|
|
#if defined (NEED_POSIX_SETPGID) || defined (HAVE_TERMIOS)
|
|
/* Do all systems with termios have setpgid? I hope so. */
|
|
/* setpgid (0, 0) is supposed to work and mean the same thing as
|
|
this, but on Ultrix 4.2A it fails with EPERM (and
|
|
setpgid (getpid (), getpid ()) succeeds). */
|
|
retval = setpgid (getpid (), getpid ());
|
|
#else
|
|
#if defined (TIOCGPGRP)
|
|
#if defined(USG) && !defined(SETPGRP_ARGS)
|
|
retval = setpgrp ();
|
|
#else
|
|
retval = setpgrp (getpid (), getpid ());
|
|
#endif /* USG */
|
|
#endif /* TIOCGPGRP. */
|
|
#endif /* NEED_POSIX_SETPGID */
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
void
|
|
_initialize_ser_hardwire ()
|
|
{
|
|
serial_add_interface (&hardwire_ops);
|
|
|
|
/* OK, figure out whether we have job control. */
|
|
|
|
#if defined (HAVE_TERMIOS)
|
|
/* Do all systems with termios have the POSIX way of identifying job
|
|
control? I hope so. */
|
|
#ifdef _POSIX_JOB_CONTROL
|
|
job_control = 1;
|
|
#else
|
|
job_control = sysconf (_SC_JOB_CONTROL);
|
|
#endif
|
|
#endif /* termios */
|
|
|
|
#ifdef HAVE_TERMIO
|
|
/* See comment at top of file about trying to support process groups
|
|
with termio. */
|
|
job_control = 0;
|
|
#endif /* termio */
|
|
|
|
#ifdef HAVE_SGTTY
|
|
#ifdef TIOCGPGRP
|
|
job_control = 1;
|
|
#else
|
|
job_control = 0;
|
|
#endif /* TIOCGPGRP */
|
|
#endif /* sgtty */
|
|
|
|
}
|