1 /* Serial interface for local (hardwired) serial ports on Un*x like systems
2 Copyright 1992, 1993 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
23 #include <sys/types.h>
25 #if !defined (HAVE_TERMIOS) && !defined (HAVE_TERMIO) && !defined (HAVE_SGTTY)
33 struct hardwire_ttystate
35 struct termios termios;
42 struct hardwire_ttystate
49 /* Needed for the code which uses select(). We would include <sys/select.h>
50 too if it existed on all systems. */
55 struct hardwire_ttystate
61 static int hardwire_open PARAMS ((serial_t scb, const char *name));
62 static void hardwire_raw PARAMS ((serial_t scb));
63 static int wait_for PARAMS ((serial_t scb, int timeout));
64 static int hardwire_readchar PARAMS ((serial_t scb, int timeout));
65 static int rate_to_code PARAMS ((int rate));
66 static int hardwire_setbaudrate PARAMS ((serial_t scb, int rate));
67 static int hardwire_write PARAMS ((serial_t scb, const char *str, int len));
68 static void hardwire_restore PARAMS ((serial_t scb));
69 static void hardwire_close PARAMS ((serial_t scb));
70 static int get_tty_state PARAMS ((serial_t scb, struct hardwire_ttystate *state));
71 static int set_tty_state PARAMS ((serial_t scb, struct hardwire_ttystate *state));
72 static serial_ttystate hardwire_get_tty_state PARAMS ((serial_t scb));
73 static int hardwire_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
75 /* Open up a real live device for serial I/O */
78 hardwire_open(scb, name)
82 scb->fd = open (name, O_RDWR);
90 get_tty_state(scb, state)
92 struct hardwire_ttystate *state;
95 return tcgetattr(scb->fd, &state->termios);
99 return ioctl (scb->fd, TCGETA, &state->termio);
103 return ioctl (scb->fd, TIOCGETP, &state->sgttyb);
108 set_tty_state(scb, state)
110 struct hardwire_ttystate *state;
115 return tcsetattr(scb->fd, TCSANOW, &state->termios);
119 return ioctl (scb->fd, TCSETA, &state->termio);
123 return ioctl (scb->fd, TIOCSETP, &state->sgttyb);
127 static serial_ttystate
128 hardwire_get_tty_state(scb)
131 struct hardwire_ttystate *state;
133 state = (struct hardwire_ttystate *)xmalloc(sizeof *state);
135 if (get_tty_state(scb, state))
138 return (serial_ttystate)state;
142 hardwire_set_tty_state(scb, ttystate)
144 serial_ttystate ttystate;
146 struct hardwire_ttystate *state;
148 state = (struct hardwire_ttystate *)ttystate;
150 return set_tty_state(scb, state);
157 struct hardwire_ttystate state;
159 if (get_tty_state(scb, &state))
160 fprintf(stderr, "get_tty_state failed: %s\n", safe_strerror(errno));
163 state.termios.c_iflag = 0;
164 state.termios.c_oflag = 0;
165 state.termios.c_lflag = 0;
166 state.termios.c_cflag &= ~(CSIZE|PARENB);
167 state.termios.c_cflag |= CS8;
168 state.termios.c_cc[VMIN] = 0;
169 state.termios.c_cc[VTIME] = 0;
173 state.termio.c_iflag = 0;
174 state.termio.c_oflag = 0;
175 state.termio.c_lflag = 0;
176 state.termio.c_cflag &= ~(CSIZE|PARENB);
177 state.termio.c_cflag |= CS8;
178 state.termio.c_cc[VMIN] = 0;
179 state.termio.c_cc[VTIME] = 0;
183 state.sgttyb.sg_flags |= RAW | ANYP;
184 state.sgttyb.sg_flags &= ~(CBREAK | ECHO);
187 scb->current_timeout = 0;
189 if (set_tty_state (scb, &state))
190 fprintf(stderr, "set_tty_state failed: %s\n", safe_strerror(errno));
193 /* Wait for input on scb, with timeout seconds. Returns 0 on success,
194 otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
196 For termio{s}, we actually just setup VTIME if necessary, and let the
197 timeout occur in the read() in hardwire_read().
201 wait_for(scb, timeout)
216 FD_SET(scb->fd, &readfds);
221 numfds = select(scb->fd+1, &readfds, 0, 0, &tv);
223 numfds = select(scb->fd+1, &readfds, 0, 0, 0);
227 return SERIAL_TIMEOUT;
228 else if (errno == EINTR)
231 return SERIAL_ERROR; /* Got an error from select or poll */
236 #endif /* HAVE_SGTTY */
238 #if defined HAVE_TERMIO || defined HAVE_TERMIOS
239 if (timeout == scb->current_timeout)
243 struct hardwire_ttystate state;
245 if (get_tty_state(scb, &state))
246 fprintf(stderr, "get_tty_state failed: %s\n", safe_strerror(errno));
249 state.termios.c_cc[VTIME] = timeout * 10;
253 state.termio.c_cc[VTIME] = timeout * 10;
256 scb->current_timeout = timeout;
258 if (set_tty_state (scb, &state))
259 fprintf(stderr, "set_tty_state failed: %s\n", safe_strerror(errno));
263 #endif /* HAVE_TERMIO || HAVE_TERMIOS */
266 /* Read a character with user-specified timeout. TIMEOUT is number of seconds
267 to wait, or -1 to wait forever. Use timeout of 0 to effect a poll. Returns
268 char if successful. Returns -2 if timeout expired, EOF if line dropped
269 dead, or -3 for any other error (see errno in that case). */
272 hardwire_readchar(scb, timeout)
278 if (scb->bufcnt-- > 0)
281 status = wait_for(scb, timeout);
286 scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ);
288 if (scb->bufcnt <= 0)
289 if (scb->bufcnt == 0)
290 return SERIAL_TIMEOUT; /* 0 chars means timeout [may need to
291 distinguish between EOF & timeouts
294 return SERIAL_ERROR; /* Got an error from read */
297 scb->bufp = scb->buf;
309 /* Translate baud rates from integers to damn B_codes. Unix should
310 have outgrown this crap years ago, but even POSIX wouldn't buck it. */
343 for (i = 0; baudtab[i].rate != -1; i++)
344 if (rate == baudtab[i].rate)
345 return baudtab[i].code;
351 hardwire_setbaudrate(scb, rate)
355 struct hardwire_ttystate state;
357 if (get_tty_state(scb, &state))
361 cfsetospeed (&state.termios, rate_to_code (rate));
362 cfsetispeed (&state.termios, rate_to_code (rate));
370 state.termio.c_cflag &= ~(CBAUD | CIBAUD);
371 state.termio.c_cflag |= rate_to_code (rate);
375 state.sgttyb.sg_ispeed = rate_to_code (rate);
376 state.sgttyb.sg_ospeed = rate_to_code (rate);
379 return set_tty_state (scb, &state);
383 hardwire_write(scb, str, len)
392 cc = write(scb->fd, str, len);
413 static struct serial_ops hardwire_ops =
422 hardwire_get_tty_state,
423 hardwire_set_tty_state,
424 hardwire_setbaudrate,
428 _initialize_ser_hardwire ()
430 serial_add_interface (&hardwire_ops);