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/* Serial interface for local (hardwired) serial ports on Un*x like systems

   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2003,

   2004, 2005, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"

#include "serial.h"

#include "ser-base.h"

#include "ser-unix.h"

#include <fcntl.h>

#include <sys/types.h>

#include "terminal.h"

#include <sys/socket.h>

#include <sys/time.h>

#include "gdb_select.h"

#include "gdb_string.h"

#include "gdbcmd.h"

#ifdef HAVE_TERMIOS

struct hardwire_ttystate

  {

    struct termios termios;

  };

#ifdef CRTSCTS

/* Boolean to explicitly enable or disable h/w flow control.  */

static int serial_hwflow;

static void

show_serial_hwflow (struct ui_file *file, int from_tty,

                    struct cmd_list_element *c, const char *value)

{

  fprintf_filtered (file, _("Hardware flow control is %s.\n"), value);

}

#endif

#endif /* termios */

#ifdef HAVE_TERMIO

/* It is believed that all systems which have added job control to SVR3

   (e.g. sco) have also added termios.  Even if not, trying to figure out

   all the variations (TIOCGPGRP vs. TCGETPGRP, etc.) would be pretty

   bewildering.  So we don't attempt it.  */

struct hardwire_ttystate

  {

    struct termio termio;

  };

#endif /* termio */

#ifdef HAVE_SGTTY

struct hardwire_ttystate

  {

    struct sgttyb sgttyb;

    struct tchars tc;

    struct ltchars ltc;

    /* Line discipline flags.  */

    int lmode;

  };

#endif /* sgtty */

static int hardwire_open (struct serial *scb, const char *name);

static void hardwire_raw (struct serial *scb);

static int wait_for (struct serial *scb, int timeout);

static int hardwire_readchar (struct serial *scb, int timeout);

static int do_hardwire_readchar (struct serial *scb, int timeout);

static int rate_to_code (int rate);

static int hardwire_setbaudrate (struct serial *scb, int rate);

static void hardwire_close (struct serial *scb);

static int get_tty_state (struct serial *scb,

                          struct hardwire_ttystate * state);

static int set_tty_state (struct serial *scb,

                          struct hardwire_ttystate * state);

static serial_ttystate hardwire_get_tty_state (struct serial *scb);

static int hardwire_set_tty_state (struct serial *scb, serial_ttystate state);

static int hardwire_noflush_set_tty_state (struct serial *, serial_ttystate,

                                           serial_ttystate);

static void hardwire_print_tty_state (struct serial *, serial_ttystate,

                                      struct ui_file *);

static int hardwire_drain_output (struct serial *);

static int hardwire_flush_output (struct serial *);

static int hardwire_flush_input (struct serial *);

static int hardwire_send_break (struct serial *);

static int hardwire_setstopbits (struct serial *, int);

void _initialize_ser_hardwire (void);

/* Open up a real live device for serial I/O */

static int

hardwire_open (struct serial *scb, const char *name)

{

  scb->fd = open (name, O_RDWR);

  if (scb->fd < 0)

    return -1;

  return 0;

}

static int

get_tty_state (struct serial *scb, struct hardwire_ttystate *state)

{

#ifdef HAVE_TERMIOS

  if (tcgetattr (scb->fd, &state->termios) < 0)

    return -1;

  return 0;

#endif

#ifdef HAVE_TERMIO

  if (ioctl (scb->fd, TCGETA, &state->termio) < 0)

    return -1;

  return 0;

#endif

#ifdef HAVE_SGTTY

  if (ioctl (scb->fd, TIOCGETP, &state->sgttyb) < 0)

    return -1;

  if (ioctl (scb->fd, TIOCGETC, &state->tc) < 0)

    return -1;

  if (ioctl (scb->fd, TIOCGLTC, &state->ltc) < 0)

    return -1;

  if (ioctl (scb->fd, TIOCLGET, &state->lmode) < 0)

    return -1;

  return 0;

#endif

}

static int

set_tty_state (struct serial *scb, struct hardwire_ttystate *state)

{

#ifdef HAVE_TERMIOS

  if (tcsetattr (scb->fd, TCSANOW, &state->termios) < 0)

    return -1;

  return 0;

#endif

#ifdef HAVE_TERMIO

  if (ioctl (scb->fd, TCSETA, &state->termio) < 0)

    return -1;

  return 0;

#endif

#ifdef HAVE_SGTTY

  if (ioctl (scb->fd, TIOCSETN, &state->sgttyb) < 0)

    return -1;

  if (ioctl (scb->fd, TIOCSETC, &state->tc) < 0)

    return -1;

  if (ioctl (scb->fd, TIOCSLTC, &state->ltc) < 0)

    return -1;

  if (ioctl (scb->fd, TIOCLSET, &state->lmode) < 0)

    return -1;

  return 0;

#endif

}

static serial_ttystate

hardwire_get_tty_state (struct serial *scb)

{

  struct hardwire_ttystate *state;

  state = (struct hardwire_ttystate *) xmalloc (sizeof *state);

  if (get_tty_state (scb, state))

    return NULL;

  return (serial_ttystate) state;

}

static int

hardwire_set_tty_state (struct serial *scb, serial_ttystate ttystate)

{

  struct hardwire_ttystate *state;

  state = (struct hardwire_ttystate *) ttystate;

  return set_tty_state (scb, state);

}

static int

hardwire_noflush_set_tty_state (struct serial *scb,

                                serial_ttystate new_ttystate,

                                serial_ttystate old_ttystate)

{

  struct hardwire_ttystate new_state;

#ifdef HAVE_SGTTY

  struct hardwire_ttystate *state = (struct hardwire_ttystate *) old_ttystate;

#endif

  new_state = *(struct hardwire_ttystate *) new_ttystate;

  /* Don't change in or out of raw mode; we don't want to flush input.

     termio and termios have no such restriction; for them flushing input

     is separate from setting the attributes.  */

#ifdef HAVE_SGTTY

  if (state->sgttyb.sg_flags & RAW)

    new_state.sgttyb.sg_flags |= RAW;

  else

    new_state.sgttyb.sg_flags &= ~RAW;

  /* I'm not sure whether this is necessary; the manpage just mentions

     RAW not CBREAK.  */

  if (state->sgttyb.sg_flags & CBREAK)

    new_state.sgttyb.sg_flags |= CBREAK;

  else

    new_state.sgttyb.sg_flags &= ~CBREAK;

#endif

  return set_tty_state (scb, &new_state);

}

static void

hardwire_print_tty_state (struct serial *scb,

                          serial_ttystate ttystate,

                          struct ui_file *stream)

{

  struct hardwire_ttystate *state = (struct hardwire_ttystate *) ttystate;

  int i;

#ifdef HAVE_TERMIOS

  fprintf_filtered (stream, "c_iflag = 0x%x, c_oflag = 0x%x,\n",

                    (int) state->termios.c_iflag,

                    (int) state->termios.c_oflag);

  fprintf_filtered (stream, "c_cflag = 0x%x, c_lflag = 0x%x\n",

                    (int) state->termios.c_cflag,

                    (int) state->termios.c_lflag);

#if 0

  /* This not in POSIX, and is not really documented by those systems

     which have it (at least not Sun).  */

  fprintf_filtered (stream, "c_line = 0x%x.\n", state->termios.c_line);

#endif

  fprintf_filtered (stream, "c_cc: ");

  for (i = 0; i < NCCS; i += 1)

    fprintf_filtered (stream, "0x%x ", state->termios.c_cc[i]);

  fprintf_filtered (stream, "\n");

#endif

#ifdef HAVE_TERMIO

  fprintf_filtered (stream, "c_iflag = 0x%x, c_oflag = 0x%x,\n",

                    state->termio.c_iflag, state->termio.c_oflag);

  fprintf_filtered (stream, "c_cflag = 0x%x, c_lflag = 0x%x, c_line = 0x%x.\n",

                    state->termio.c_cflag, state->termio.c_lflag,

                    state->termio.c_line);

  fprintf_filtered (stream, "c_cc: ");

  for (i = 0; i < NCC; i += 1)

    fprintf_filtered (stream, "0x%x ", state->termio.c_cc[i]);

  fprintf_filtered (stream, "\n");

#endif

#ifdef HAVE_SGTTY

  fprintf_filtered (stream, "sgttyb.sg_flags = 0x%x.\n",

                    state->sgttyb.sg_flags);

  fprintf_filtered (stream, "tchars: ");

  for (i = 0; i < (int) sizeof (struct tchars); i++)

    fprintf_filtered (stream, "0x%x ", ((unsigned char *) &state->tc)[i]);

  fprintf_filtered (stream, "\n");

  fprintf_filtered (stream, "ltchars: ");

  for (i = 0; i < (int) sizeof (struct ltchars); i++)

    fprintf_filtered (stream, "0x%x ", ((unsigned char *) &state->ltc)[i]);

  fprintf_filtered (stream, "\n");

  fprintf_filtered (stream, "lmode:  0x%x\n", state->lmode);

#endif

}

/* Wait for the output to drain away, as opposed to flushing (discarding) it */

static int

hardwire_drain_output (struct serial *scb)

{

#ifdef HAVE_TERMIOS

  return tcdrain (scb->fd);

#endif

#ifdef HAVE_TERMIO

  return ioctl (scb->fd, TCSBRK, 1);

#endif

#ifdef HAVE_SGTTY

  /* Get the current state and then restore it using TIOCSETP,

     which should cause the output to drain and pending input

     to be discarded. */

  {

    struct hardwire_ttystate state;

    if (get_tty_state (scb, &state))

      {

        return (-1);

      }

    else

      {

        return (ioctl (scb->fd, TIOCSETP, &state.sgttyb));

      }

  }

#endif

}

static int

hardwire_flush_output (struct serial *scb)

{

#ifdef HAVE_TERMIOS

  return tcflush (scb->fd, TCOFLUSH);

#endif

#ifdef HAVE_TERMIO

  return ioctl (scb->fd, TCFLSH, 1);

#endif

#ifdef HAVE_SGTTY

  /* This flushes both input and output, but we can't do better.  */

  return ioctl (scb->fd, TIOCFLUSH, 0);

#endif

}

static int

hardwire_flush_input (struct serial *scb)

{

  ser_base_flush_input (scb);

#ifdef HAVE_TERMIOS

  return tcflush (scb->fd, TCIFLUSH);

#endif

#ifdef HAVE_TERMIO

  return ioctl (scb->fd, TCFLSH, 0);

#endif

#ifdef HAVE_SGTTY

  /* This flushes both input and output, but we can't do better.  */

  return ioctl (scb->fd, TIOCFLUSH, 0);

#endif

}

static int

hardwire_send_break (struct serial *scb)

{

#ifdef HAVE_TERMIOS

  return tcsendbreak (scb->fd, 0);

#endif

#ifdef HAVE_TERMIO

  return ioctl (scb->fd, TCSBRK, 0);

#endif

#ifdef HAVE_SGTTY

  {

    int status;

    status = ioctl (scb->fd, TIOCSBRK, 0);

    /* Can't use usleep; it doesn't exist in BSD 4.2.  */

    /* Note that if this gdb_select() is interrupted by a signal it will not

       wait the full length of time.  I think that is OK.  */

    gdb_usleep (250000);

    status = ioctl (scb->fd, TIOCCBRK, 0);

    return status;

  }

#endif

}

static void

hardwire_raw (struct serial *scb)

{

  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

  state.termios.c_iflag = 0;

  state.termios.c_oflag = 0;

  state.termios.c_lflag = 0;

  state.termios.c_cflag &= ~(CSIZE | PARENB);

  state.termios.c_cflag |= CLOCAL | CS8;

#ifdef CRTSCTS

  /* h/w flow control.  */

  if (serial_hwflow)

    state.termios.c_cflag |= CRTSCTS;

  else

    state.termios.c_cflag &= ~CRTSCTS;

#ifdef CRTS_IFLOW

  if (serial_hwflow)

    state.termios.c_cflag |= CRTS_IFLOW;

  else

    state.termios.c_cflag &= ~CRTS_IFLOW;

#endif

#endif

  state.termios.c_cc[VMIN] = 0;

  state.termios.c_cc[VTIME] = 0;

#endif

#ifdef HAVE_TERMIO

  state.termio.c_iflag = 0;

  state.termio.c_oflag = 0;

  state.termio.c_lflag = 0;

  state.termio.c_cflag &= ~(CSIZE | PARENB);

  state.termio.c_cflag |= CLOCAL | CS8;

  state.termio.c_cc[VMIN] = 0;

  state.termio.c_cc[VTIME] = 0;

#endif

#ifdef HAVE_SGTTY

  state.sgttyb.sg_flags |= RAW | ANYP;

  state.sgttyb.sg_flags &= ~(CBREAK | ECHO);

#endif

  scb->current_timeout = 0;

  if (set_tty_state (scb, &state))

    fprintf_unfiltered (gdb_stderr, "set_tty_state failed: %s\n", safe_strerror (errno));

}

/* Wait for input on scb, with timeout seconds.  Returns 0 on success,

   otherwise SERIAL_TIMEOUT or SERIAL_ERROR.

   For termio{s}, we actually just setup VTIME if necessary, and let the

   timeout occur in the read() in hardwire_read().

 */

/* FIXME: cagney/1999-09-16: Don't replace this with the equivalent

   ser_base*() until the old TERMIOS/SGTTY/... timer code has been

   flushed. . */

/* NOTE: cagney/1999-09-30: Much of the code below is dead.  The only

   possible values of the TIMEOUT parameter are ONE and ZERO.

   Consequently all the code that tries to handle the possability of

   an overflowed timer is unnecessary. */

static int

wait_for (struct serial *scb, int timeout)

{

#ifdef HAVE_SGTTY

  while (1)

    {

      struct timeval tv;

      fd_set readfds;

      int numfds;

      /* NOTE: Some OS's can scramble the READFDS when the select()

         call fails (ex the kernel with Red Hat 5.2).  Initialize all

         arguments before each call. */

      tv.tv_sec = timeout;

      tv.tv_usec = 0;

      FD_ZERO (&readfds);

      FD_SET (scb->fd, &readfds);

      if (timeout >= 0)

        numfds = gdb_select (scb->fd + 1, &readfds, 0, 0, &tv);

      else

        numfds = gdb_select (scb->fd + 1, &readfds, 0, 0, 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;

    }

#endif /* HAVE_SGTTY */

#if defined HAVE_TERMIO || defined HAVE_TERMIOS

  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)

      {

        /* 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_base*() until the old TERMIOS/SGTTY/... timer code has been

   flushed. */

/* NOTE: cagney/1999-09-16: This function is not identical to

   ser_base_readchar() as part of replacing it with ser_base*()

   merging will be required - this code handles the case where read()

   times out due to no data while ser_base_readchar() doesn't expect

   that. */

static int

do_hardwire_readchar (struct serial *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

         deprecated_ui_loop_hook signals that we should exit by

         returning 1.  */

      if (deprecated_ui_loop_hook)

        detach = deprecated_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 (struct serial *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

  }