gdb/ser-unix.c

   1 /* Serial interface for local (hardwired) serial ports on Un*x like systems
   2    Copyright 1992, 1993 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   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.
  10
  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.
  15
  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.  */
  19
  20 #include "defs.h"
  21 #include "serial.h"
  22 #include <fcntl.h>
  23 #include <sys/types.h>
  24 #include <sys/time.h>
  25
  26 #if !defined (HAVE_TERMIOS) && !defined (HAVE_TERMIO) && !defined (HAVE_SGTTY)
  27 #define HAVE_SGTTY
  28 #endif
  29
  30 #ifdef HAVE_TERMIOS
  31 #include <termios.h>
  32 #include <unistd.h>
  33 #endif
  34 #ifdef HAVE_TERMIO
  35 #include <sys/termio.h>
  36 #endif
  37 #ifdef HAVE_SGTTY
  38 #include <sgtty.h>
  39 #endif
  40
  41 /* Open up a real live device for serial I/O */
  42
  43 static int
  44 hardwire_open(scb, name)
  45      serial_t scb;
  46      const char *name;
  47 {
  48   scb->fd = open (name, O_RDWR);
  49   if (scb->fd < 0)
  50     return -1;
  51
  52   return 0;
  53 }
  54
  55 static void
  56 hardwire_raw(scb)
  57      serial_t scb;
  58 {
  59 #ifdef HAVE_TERMIOS
  60   struct termios termios;
  61
  62   if (tcgetattr(scb->fd, &termios))
  63     {
  64       fprintf(stderr, "tcgetattr failed: %s\n", safe_strerror(errno));
  65     }
  66
  67   termios.c_iflag = 0;
  68   termios.c_oflag = 0;
  69   termios.c_lflag = 0;
  70   termios.c_cflag &= ~(CSIZE|PARENB);
  71   termios.c_cflag |= CS8;
  72   termios.c_cc[VMIN] = 0;
  73   termios.c_cc[VTIME] = 0;
  74
  75   if (tcsetattr(scb->fd, TCSANOW, &termios))
  76     {
  77       fprintf(stderr, "tcsetattr failed: %s\n", safe_strerror(errno));
  78     }
  79 #endif
  80
  81 #ifdef HAVE_TERMIO
  82   struct termio termio;
  83
  84   if (ioctl (scb->fd, TCGETA, &termio))
  85     {
  86       fprintf(stderr, "TCGETA failed: %s\n", safe_strerror(errno));
  87     }
  88
  89   termio.c_iflag = 0;
  90   termio.c_oflag = 0;
  91   termio.c_lflag = 0;
  92   termio.c_cflag &= ~(CSIZE|PARENB);
  93   termio.c_cflag |= CS8;
  94   termio.c_cc[VMIN] = 0;
  95   termio.c_cc[VTIME] = 0;
  96
  97   if (ioctl (scb->fd, TCSETA, &termio))
  98     {
  99       fprintf(stderr, "TCSETA failed: %s\n", safe_strerror(errno));
 100     }
 101 #endif
 102
 103 #ifdef HAVE_SGTTY
 104   struct sgttyb sgttyb;
 105
 106   if (ioctl (scb->fd, TIOCGETP, &sgttyb))
 107     fprintf(stderr, "TIOCGETP failed: %s\n", safe_strerror(errno));
 108
 109   sgttyb.sg_flags |= RAW | ANYP;
 110   sgttyb.sg_flags &= ~(CBREAK | ECHO);
 111
 112   if (ioctl (scb->fd, TIOCSETP, &sgttyb))
 113     fprintf(stderr, "TIOCSETP failed: %s\n", safe_strerror(errno));
 114 #endif
 115 }
 116
 117 /* Read a character with user-specified timeout.  TIMEOUT is number of seconds
 118    to wait, or -1 to wait forever.  Use timeout of 0 to effect a poll.  Returns
 119    char if successful.  Returns -2 if timeout expired, EOF if line dropped
 120    dead, or -3 for any other error (see errno in that case). */
 121
 122 static int
 123 hardwire_readchar(scb, timeout)
 124      serial_t scb;
 125      int timeout;
 126 {
 127   int numfds;
 128   struct timeval tv;
 129   fd_set readfds;
 130
 131   if (scb->bufcnt-- > 0)
 132     return *scb->bufp++;
 133
 134   FD_ZERO (&readfds);
 135
 136   tv.tv_sec = timeout;
 137   tv.tv_usec = 0;
 138
 139   FD_SET(scb->fd, &readfds);
 140
 141   if (timeout >= 0)
 142     numfds = select(scb->fd+1, &readfds, 0, 0, &tv);
 143   else
 144     numfds = select(scb->fd+1, &readfds, 0, 0, 0);
 145
 146   if (numfds <= 0)
 147     if (numfds == 0)
 148       return SERIAL_TIMEOUT;
 149     else
 150       return SERIAL_ERROR;      /* Got an error from select */
 151
 152   scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ);
 153
 154   if (scb->bufcnt <= 0)
 155     if (scb->bufcnt == 0)
 156       return SERIAL_EOF;        /* 0 chars means end of file */
 157     else
 158       return SERIAL_ERROR;      /* Got an error from read */
 159
 160   scb->bufcnt--;
 161   scb->bufp = scb->buf;
 162   return *scb->bufp++;
 163 }
 164
 165 #ifndef B19200
 166 #define B19200 EXTA
 167 #endif
 168
 169 #ifndef B38400
 170 #define B38400 EXTB
 171 #endif
 172
 173 /* Translate baud rates from integers to damn B_codes.  Unix should
 174    have outgrown this crap years ago, but even POSIX wouldn't buck it.  */
 175
 176 static struct
 177 {
 178   int rate;
 179   int code;
 180 }
 181 baudtab[] =
 182 {
 183   {50, B50},
 184   {75, B75},
 185   {110, B110},
 186   {134, B134},
 187   {150, B150},
 188   {200, B200},
 189   {300, B300},
 190   {600, B600},
 191   {1200, B1200},
 192   {1800, B1800},
 193   {2400, B2400},
 194   {4800, B4800},
 195   {9600, B9600},
 196   {19200, B19200},
 197   {38400, B38400},
 198   {-1, -1},
 199 };
 200
 201 static int
 202 rate_to_code(rate)
 203      int rate;
 204 {
 205   int i;
 206
 207   for (i = 0; baudtab[i].rate != -1; i++)
 208     if (rate == baudtab[i].rate)
 209       return baudtab[i].code;
 210
 211   return -1;
 212 }
 213
 214 static int
 215 hardwire_setbaudrate(scb, rate)
 216      serial_t scb;
 217      int rate;
 218 {
 219 #ifdef HAVE_TERMIOS
 220   struct termios termios;
 221
 222   if (tcgetattr (scb->fd, &termios))
 223     return -1;
 224
 225   cfsetospeed (&termios, rate_to_code (rate));
 226   cfsetispeed (&termios, rate_to_code (rate));
 227
 228   if (tcsetattr (scb->fd, TCSANOW, &termios))
 229     return -1;
 230 #endif
 231
 232 #ifdef HAVE_TERMIO
 233   struct termio termio;
 234
 235   if (ioctl (scb->fd, TCGETA, &termio))
 236     return -1;
 237
 238 #ifndef CIBAUD
 239 #define CIBAUD CBAUD
 240 #endif
 241
 242   termio.c_cflag &= ~(CBAUD | CIBAUD);
 243   termio.c_cflag |= rate_to_code (rate);
 244
 245   if (ioctl (scb->fd, TCSETA, &termio))
 246     return -1;
 247 #endif
 248
 249 #ifdef HAVE_SGTTY
 250   struct sgttyb sgttyb;
 251
 252   if (ioctl (scb->fd, TIOCGETP, &sgttyb))
 253     return -1;
 254
 255   sgttyb.sg_ispeed = rate_to_code (rate);
 256   sgttyb.sg_ospeed = rate_to_code (rate);
 257
 258   if (ioctl (scb->fd, TIOCSETP, &sgttyb))
 259     return -1;
 260 #endif
 261   return 0;
 262 }
 263
 264 static int
 265 hardwire_write(scb, str, len)
 266      serial_t scb;
 267      const char *str;
 268      int len;
 269 {
 270   int cc;
 271
 272   while (len > 0)
 273     {
 274       cc = write(scb->fd, str, len);
 275
 276       if (cc < 0)
 277         return 1;
 278       len -= cc;
 279       str += cc;
 280     }
 281   return 0;
 282 }
 283
 284 static void
 285 hardwire_restore(scb)
 286      serial_t scb;
 287 {
 288 }
 289
 290 static void
 291 hardwire_close(scb)
 292      serial_t scb;
 293 {
 294   if (scb->fd < 0)
 295     return;
 296
 297   close(scb->fd);
 298   scb->fd = -1;
 299 }
 300
 301 static struct serial_ops hardwire_ops =
 302 {
 303   "hardwire",
 304   0,
 305   hardwire_open,
 306   hardwire_close,
 307   hardwire_readchar,
 308   hardwire_write,
 309   hardwire_raw,
 310   hardwire_restore,
 311   hardwire_setbaudrate
 312 };
 313
 314 _initialize_ser_hardwire ()
 315 {
 316   serial_add_interface (&hardwire_ops);
 317 }