424 lines
8.7 KiB
C
424 lines
8.7 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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#include <sys/time.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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};
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#endif
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#ifdef HAVE_TERMIO
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#include <termio.h>
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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
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#ifdef HAVE_SGTTY
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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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};
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#endif
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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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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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return tcgetattr(scb->fd, &state->termios);
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#endif
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#ifdef HAVE_TERMIO
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return ioctl (scb->fd, TCGETA, &state->termio);
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#endif
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#ifdef HAVE_SGTTY
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return ioctl (scb->fd, TIOCGETP, &state->sgttyb);
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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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int err;
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#ifdef HAVE_TERMIOS
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return tcsetattr(scb->fd, TCSANOW, &state->termios);
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#endif
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#ifdef HAVE_TERMIO
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return ioctl (scb->fd, TCSETA, &state->termio);
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#endif
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#ifdef HAVE_SGTTY
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return ioctl (scb->fd, TIOCSETP, &state->sgttyb);
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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 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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int numfds;
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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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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
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return SERIAL_ERROR; /* Got an error from select or poll */
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return 0;
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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 -2 if timeout expired, EOF if line dropped
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dead, or -3 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
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someday] */
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else
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return SERIAL_ERROR; /* Got an error from read */
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scb->bufcnt--;
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scb->bufp = scb->buf;
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return *scb->bufp++;
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}
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#ifndef B19200
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#define B19200 EXTA
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#endif
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#ifndef B38400
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#define B38400 EXTB
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#endif
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/* Translate baud rates from integers to damn B_codes. Unix should
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have outgrown this crap years ago, but even POSIX wouldn't buck it. */
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static struct
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{
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int rate;
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int code;
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}
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baudtab[] =
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{
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{50, B50},
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{75, B75},
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{110, B110},
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{134, B134},
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{150, B150},
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{200, B200},
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{300, B300},
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{600, B600},
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{1200, B1200},
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{1800, B1800},
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{2400, B2400},
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{4800, B4800},
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{9600, B9600},
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{19200, B19200},
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{38400, B38400},
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{-1, -1},
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};
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static int
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rate_to_code(rate)
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int rate;
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{
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int i;
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for (i = 0; baudtab[i].rate != -1; i++)
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if (rate == baudtab[i].rate)
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return baudtab[i].code;
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return -1;
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}
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static int
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hardwire_setbaudrate(scb, rate)
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serial_t scb;
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int rate;
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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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return -1;
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#ifdef HAVE_TERMIOS
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cfsetospeed (&state.termios, rate_to_code (rate));
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cfsetispeed (&state.termios, rate_to_code (rate));
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#endif
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#ifdef HAVE_TERMIO
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#ifndef CIBAUD
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#define CIBAUD CBAUD
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#endif
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state.termio.c_cflag &= ~(CBAUD | CIBAUD);
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state.termio.c_cflag |= rate_to_code (rate);
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#endif
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#ifdef HAVE_SGTTY
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state.sgttyb.sg_ispeed = rate_to_code (rate);
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state.sgttyb.sg_ospeed = rate_to_code (rate);
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#endif
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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_write(scb, str, len)
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serial_t scb;
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const char *str;
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int len;
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{
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int cc;
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while (len > 0)
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{
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cc = write(scb->fd, str, len);
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if (cc < 0)
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return 1;
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len -= cc;
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str += cc;
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}
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return 0;
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}
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static void
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hardwire_close(scb)
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serial_t scb;
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{
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if (scb->fd < 0)
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return;
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close(scb->fd);
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scb->fd = -1;
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}
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static struct serial_ops hardwire_ops =
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{
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"hardwire",
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0,
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hardwire_open,
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hardwire_close,
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hardwire_readchar,
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hardwire_write,
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hardwire_raw,
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hardwire_get_tty_state,
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hardwire_set_tty_state,
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hardwire_setbaudrate,
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};
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void
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_initialize_ser_hardwire ()
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{
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serial_add_interface (&hardwire_ops);
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}
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