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- /* Serial interface for local (hardwired) serial ports on Un*x like systems
- Copyright 1992, 1993, 1994 Free Software Foundation, Inc.
-
- This file is part of GDB.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include "defs.h"
- #include "serial.h"
- #include <fcntl.h>
- #include <sys/types.h>
-
- #if !defined (HAVE_TERMIOS) && !defined (HAVE_TERMIO) && !defined (HAVE_SGTTY)
- #define HAVE_SGTTY
- #endif
-
- #ifdef HAVE_TERMIOS
- #include <termios.h>
- #include <unistd.h>
-
- struct hardwire_ttystate
- {
- struct termios termios;
- };
- #endif /* termios */
-
- #ifdef HAVE_TERMIO
- #include <termio.h>
-
- /* 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
- /* Needed for the code which uses select(). We would include <sys/select.h>
- too if it existed on all systems. */
- #include <sys/time.h>
-
- #include <sgtty.h>
-
- struct hardwire_ttystate
- {
- struct sgttyb sgttyb;
- struct tchars tc;
- struct ltchars ltc;
- /* Line discipline flags. */
- int lmode;
- };
- #endif /* sgtty */
-
- static int hardwire_open PARAMS ((serial_t scb, const char *name));
- static void hardwire_raw PARAMS ((serial_t scb));
- static int wait_for PARAMS ((serial_t scb, int timeout));
- static int hardwire_readchar PARAMS ((serial_t scb, int timeout));
- static int rate_to_code PARAMS ((int rate));
- static int hardwire_setbaudrate PARAMS ((serial_t scb, int rate));
- static int hardwire_write PARAMS ((serial_t scb, const char *str, int len));
- /* FIXME: static void hardwire_restore PARAMS ((serial_t scb)); */
- static void hardwire_close PARAMS ((serial_t scb));
- static int get_tty_state PARAMS ((serial_t scb, struct hardwire_ttystate *state));
- static int set_tty_state PARAMS ((serial_t scb, struct hardwire_ttystate *state));
- static serial_ttystate hardwire_get_tty_state PARAMS ((serial_t scb));
- static int hardwire_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
-
- /* Open up a real live device for serial I/O */
-
- static int
- hardwire_open(scb, name)
- serial_t scb;
- const char *name;
- {
- scb->fd = open (name, O_RDWR);
- if (scb->fd < 0)
- return -1;
-
- return 0;
- }
-
- static int
- get_tty_state(scb, state)
- serial_t scb;
- struct hardwire_ttystate *state;
- {
- #ifdef HAVE_TERMIOS
- extern int errno;
-
- 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(scb, state)
- serial_t 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(scb)
- serial_t 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(scb, ttystate)
- serial_t 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 (scb, new_ttystate, old_ttystate)
- serial_t scb;
- serial_ttystate new_ttystate;
- serial_ttystate old_ttystate;
- {
- struct hardwire_ttystate new_state;
- struct hardwire_ttystate *state = (struct hardwire_ttystate *) old_ttystate;
-
- 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 (scb, ttystate)
- serial_t scb;
- serial_ttystate ttystate;
- {
- struct hardwire_ttystate *state = (struct hardwire_ttystate *) ttystate;
- int i;
-
- #ifdef HAVE_TERMIOS
- printf_filtered ("c_iflag = 0x%x, c_oflag = 0x%x,\n",
- state->termios.c_iflag, state->termios.c_oflag);
- printf_filtered ("c_cflag = 0x%x, c_lflag = 0x%x\n",
- state->termios.c_cflag, 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). */
- printf_filtered ("c_line = 0x%x.\n", state->termios.c_line);
- #endif
- printf_filtered ("c_cc: ");
- for (i = 0; i < NCCS; i += 1)
- printf_filtered ("0x%x ", state->termios.c_cc[i]);
- printf_filtered ("\n");
- #endif
-
- #ifdef HAVE_TERMIO
- printf_filtered ("c_iflag = 0x%x, c_oflag = 0x%x,\n",
- state->termio.c_iflag, state->termio.c_oflag);
- printf_filtered ("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);
- printf_filtered ("c_cc: ");
- for (i = 0; i < NCC; i += 1)
- printf_filtered ("0x%x ", state->termio.c_cc[i]);
- printf_filtered ("\n");
- #endif
-
- #ifdef HAVE_SGTTY
- printf_filtered ("sgttyb.sg_flags = 0x%x.\n", state->sgttyb.sg_flags);
-
- printf_filtered ("tchars: ");
- for (i = 0; i < (int)sizeof (struct tchars); i++)
- printf_filtered ("0x%x ", ((unsigned char *)&state->tc)[i]);
- printf_filtered ("\n");
-
- printf_filtered ("ltchars: ");
- for (i = 0; i < (int)sizeof (struct ltchars); i++)
- printf_filtered ("0x%x ", ((unsigned char *)&state->ltc)[i]);
- printf_filtered ("\n");
-
- printf_filtered ("lmode: 0x%x\n", state->lmode);
- #endif
- }
-
- static int
- hardwire_flush_output (scb)
- serial_t 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 (scb)
- serial_t 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 (scb)
- serial_t 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;
- struct timeval timeout;
-
- status = ioctl (scb->fd, TIOCSBRK, 0);
-
- /* Can't use usleep; it doesn't exist in BSD 4.2. */
- /* Note that if this select() is interrupted by a signal it will not wait
- the full length of time. I think that is OK. */
- timeout.tv_sec = 0;
- timeout.tv_usec = 250000;
- select (0, 0, 0, 0, &timeout);
- status = ioctl (scb->fd, TIOCCBRK, 0);
- return status;
- }
- #endif
- }
-
- static void
- hardwire_raw(scb)
- serial_t 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;
- 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().
- */
-
- static int
- wait_for(scb, timeout)
- serial_t scb;
- int timeout;
- {
- scb->timeout_remaining = 0;
-
- #ifdef HAVE_SGTTY
- {
- struct timeval tv;
- fd_set readfds;
-
- FD_ZERO (&readfds);
-
- tv.tv_sec = timeout;
- tv.tv_usec = 0;
-
- FD_SET(scb->fd, &readfds);
-
- while (1)
- {
- int numfds;
-
- if (timeout >= 0)
- numfds = select(scb->fd+1, &readfds, 0, 0, &tv);
- else
- numfds = 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). */
-
- static int
- hardwire_readchar(scb, timeout)
- serial_t scb;
- int timeout;
- {
- int status;
-
- if (scb->bufcnt-- > 0)
- return *scb->bufp++;
-
- while (1)
- {
- status = wait_for (scb, timeout);
-
- if (status < 0)
- return status;
-
- scb->bufcnt = read (scb->fd, scb->buf, BUFSIZ);
-
- if (scb->bufcnt <= 0)
- {
- if (scb->bufcnt == 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
- return SERIAL_TIMEOUT;
- }
- else if (errno == EINTR)
- continue;
- 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_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,
- };
-
- void
- _initialize_ser_hardwire ()
- {
- serial_add_interface (&hardwire_ops);
- }
-