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
  25 /* Note: HAVE_SELECT is not yet defined on all the systems which could
  26    define it.  The USE_ALARM_TIMEOUT code seems to work OK, though, so
  27    it doesn't really matter.  */
  28 #if !defined (HAVE_SELECT)
  29 #if defined (HAVE_TERMIO)
  30 #define USE_TERMIO_TIMEOUT 1
  31 #else
  32 #define USE_ALARM_TIMEOUT 1
  33 #endif
  34 #endif
  35
  36 #if defined (HAVE_SELECT)
  37 #include <sys/time.h>
  38 #endif
  39 #ifdef USE_ALARM_TIMEOUT
  40 #include <signal.h>
  41 #endif
  42
  43 #if !defined (HAVE_TERMIOS) && !defined (HAVE_TERMIO) && !defined (HAVE_SGTTY)
  44 #define HAVE_SGTTY
  45 #endif
  46
  47 #ifdef HAVE_TERMIOS
  48 #include <termios.h>
  49 #include <unistd.h>
  50 #endif
  51 #ifdef HAVE_TERMIO
  52 #include <sys/termio.h>
  53 #endif
  54 #ifdef HAVE_SGTTY
  55 #include <sgtty.h>
  56 #endif
  57
  58 /* Open up a real live device for serial I/O */
  59
  60 static int
  61 hardwire_open(scb, name)
  62      serial_t scb;
  63      const char *name;
  64 {
  65   scb->fd = open (name, O_RDWR);
  66   if (scb->fd < 0)
  67     return -1;
  68
  69   return 0;
  70 }
  71
  72 static void
  73 hardwire_raw(scb)
  74      serial_t scb;
  75 {
  76 #ifdef HAVE_TERMIOS
  77   struct termios termios;
  78
  79   if (tcgetattr(scb->fd, &termios))
  80     {
  81       fprintf(stderr, "tcgetattr failed: %s\n", safe_strerror(errno));
  82     }
  83
  84   termios.c_iflag = 0;
  85   termios.c_oflag = 0;
  86   termios.c_lflag = 0;
  87   termios.c_cflag &= ~(CSIZE|PARENB);
  88   termios.c_cflag |= CS8;
  89   termios.c_cc[VMIN] = 0;
  90   termios.c_cc[VTIME] = 0;
  91
  92   if (tcsetattr(scb->fd, TCSANOW, &termios))
  93     {
  94       fprintf(stderr, "tcsetattr failed: %s\n", safe_strerror(errno));
  95     }
  96 #endif
  97
  98 #ifdef HAVE_TERMIO
  99   struct termio termio;
 100
 101   if (ioctl (scb->fd, TCGETA, &termio))
 102     {
 103       fprintf(stderr, "TCGETA failed: %s\n", safe_strerror(errno));
 104     }
 105
 106   termio.c_iflag = 0;
 107   termio.c_oflag = 0;
 108   termio.c_lflag = 0;
 109   termio.c_cflag &= ~(CSIZE|PARENB);
 110   termio.c_cflag |= CS8;
 111   termio.c_cc[VMIN] = 0;
 112   termio.c_cc[VTIME] = 0;
 113
 114   if (ioctl (scb->fd, TCSETA, &termio))
 115     {
 116       fprintf(stderr, "TCSETA failed: %s\n", safe_strerror(errno));
 117     }
 118 #endif
 119
 120 #ifdef HAVE_SGTTY
 121   struct sgttyb sgttyb;
 122
 123   if (ioctl (scb->fd, TIOCGETP, &sgttyb))
 124     fprintf(stderr, "TIOCGETP failed: %s\n", safe_strerror(errno));
 125
 126   sgttyb.sg_flags |= RAW | ANYP;
 127   sgttyb.sg_flags &= ~(CBREAK | ECHO);
 128
 129   if (ioctl (scb->fd, TIOCSETP, &sgttyb))
 130     fprintf(stderr, "TIOCSETP failed: %s\n", safe_strerror(errno));
 131 #endif
 132 }
 133
 134 #ifdef USE_ALARM_TIMEOUT
 135 /* Called when SIGALRM sent.  */
 136 static void
 137 remote_timer ()
 138 {
 139 }
 140 #endif
 141
 142 /* Read a character with user-specified timeout.  TIMEOUT is number of seconds
 143    to wait, or -1 to wait forever.  Use timeout of 0 to effect a poll.  Returns
 144    char if successful.  Returns -2 if timeout expired, EOF if line dropped
 145    dead, or -3 for any other error (see errno in that case). */
 146
 147 static int
 148 hardwire_readchar(scb, timeout)
 149      serial_t scb;
 150      int timeout;
 151 {
 152   if (scb->bufcnt-- > 0)
 153     return *scb->bufp++;
 154
 155 #ifdef HAVE_SELECT
 156   {
 157     int numfds;
 158     struct timeval tv;
 159     fd_set readfds;
 160
 161     FD_ZERO (&readfds);
 162
 163     tv.tv_sec = timeout;
 164     tv.tv_usec = 0;
 165
 166     FD_SET(scb->fd, &readfds);
 167
 168     if (timeout >= 0)
 169       numfds = select(scb->fd+1, &readfds, 0, 0, &tv);
 170     else
 171       numfds = select(scb->fd+1, &readfds, 0, 0, 0);
 172
 173     if (numfds <= 0)
 174       if (numfds == 0)
 175         return SERIAL_TIMEOUT;
 176       else
 177         return SERIAL_ERROR;    /* Got an error from select */
 178
 179     scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ);
 180   }
 181 #endif /* HAVE_SELECT.  */
 182
 183 #ifdef USE_TERMIO_TIMEOUT
 184   {
 185     struct termio termio;
 186
 187     if (ioctl (scb->fd, TCGETA, &termio))
 188       {
 189         fprintf(stderr, "TCGETA failed: %s\n", safe_strerror(errno));
 190       }
 191
 192     termio.c_cc[VTIME] = timeout * 10;
 193
 194     if (ioctl (scb->fd, TCSETA, &termio))
 195       {
 196         fprintf(stderr, "TCSETA failed: %s\n", safe_strerror(errno));
 197       }
 198
 199     scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ);
 200     if (scb->bufcnt == 0)
 201       /* Can this also mean end of file?  Does "end of file" have any
 202          meaning with ICANON clear?  */
 203       return SERIAL_TIMEOUT;
 204   }
 205 #endif /* USE_TERMIO_TIMEOUT.  */
 206
 207 #ifdef USE_ALARM_TIMEOUT
 208   {
 209     void (*old_sigalrm_handler) ();
 210     int save_errno;
 211 #ifndef NO_SIGINTERRUPT
 212     /* Cause SIGARLM to make read fail with EINTR.  */
 213     if (siginterrupt (SIGALRM, 1) != 0)
 214       fprintf (stderr, "siginterrupt failed: %s\n", safe_strerror (errno));
 215 #endif
 216
 217     old_sigalrm_handler = (void (*) ()) signal (SIGALRM, remote_timer);
 218     if (old_sigalrm_handler == (void (*) ()) -1)
 219       fprintf (stderr, "signal failed: %s\n", safe_strerror (errno));
 220
 221     alarm (timeout);
 222     scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ);
 223     save_errno = errno;
 224     alarm (0);
 225     signal (SIGALRM, old_sigalrm_handler);
 226     if (scb->bufcnt < 0 && errno == EINTR)
 227       {
 228         return SERIAL_TIMEOUT;
 229       }
 230   }
 231 #endif /* USE_ALARM_TIMEOUT */
 232
 233   if (scb->bufcnt <= 0)
 234     if (scb->bufcnt == 0)
 235       return SERIAL_EOF;        /* 0 chars means end of file */
 236     else
 237       return SERIAL_ERROR;      /* Got an error from read */
 238
 239   scb->bufcnt--;
 240   scb->bufp = scb->buf;
 241   return *scb->bufp++;
 242 }
 243
 244 #ifndef B19200
 245 #define B19200 EXTA
 246 #endif
 247
 248 #ifndef B38400
 249 #define B38400 EXTB
 250 #endif
 251
 252 /* Translate baud rates from integers to damn B_codes.  Unix should
 253    have outgrown this crap years ago, but even POSIX wouldn't buck it.  */
 254
 255 static struct
 256 {
 257   int rate;
 258   int code;
 259 }
 260 baudtab[] =
 261 {
 262   {50, B50},
 263   {75, B75},
 264   {110, B110},
 265   {134, B134},
 266   {150, B150},
 267   {200, B200},
 268   {300, B300},
 269   {600, B600},
 270   {1200, B1200},
 271   {1800, B1800},
 272   {2400, B2400},
 273   {4800, B4800},
 274   {9600, B9600},
 275   {19200, B19200},
 276   {38400, B38400},
 277   {-1, -1},
 278 };
 279
 280 static int
 281 rate_to_code(rate)
 282      int rate;
 283 {
 284   int i;
 285
 286   for (i = 0; baudtab[i].rate != -1; i++)
 287     if (rate == baudtab[i].rate)
 288       return baudtab[i].code;
 289
 290   return -1;
 291 }
 292
 293 static int
 294 hardwire_setbaudrate(scb, rate)
 295      serial_t scb;
 296      int rate;
 297 {
 298 #ifdef HAVE_TERMIOS
 299   struct termios termios;
 300
 301   if (tcgetattr (scb->fd, &termios))
 302     return -1;
 303
 304   cfsetospeed (&termios, rate_to_code (rate));
 305   cfsetispeed (&termios, rate_to_code (rate));
 306
 307   if (tcsetattr (scb->fd, TCSANOW, &termios))
 308     return -1;
 309 #endif
 310
 311 #ifdef HAVE_TERMIO
 312   struct termio termio;
 313
 314   if (ioctl (scb->fd, TCGETA, &termio))
 315     return -1;
 316
 317 #ifndef CIBAUD
 318 #define CIBAUD CBAUD
 319 #endif
 320
 321   termio.c_cflag &= ~(CBAUD | CIBAUD);
 322   termio.c_cflag |= rate_to_code (rate);
 323
 324   if (ioctl (scb->fd, TCSETA, &termio))
 325     return -1;
 326 #endif
 327
 328 #ifdef HAVE_SGTTY
 329   struct sgttyb sgttyb;
 330
 331   if (ioctl (scb->fd, TIOCGETP, &sgttyb))
 332     return -1;
 333
 334   sgttyb.sg_ispeed = rate_to_code (rate);
 335   sgttyb.sg_ospeed = rate_to_code (rate);
 336
 337   if (ioctl (scb->fd, TIOCSETP, &sgttyb))
 338     return -1;
 339 #endif
 340   return 0;
 341 }
 342
 343 static int
 344 hardwire_write(scb, str, len)
 345      serial_t scb;
 346      const char *str;
 347      int len;
 348 {
 349   int cc;
 350
 351   while (len > 0)
 352     {
 353       cc = write(scb->fd, str, len);
 354
 355       if (cc < 0)
 356         return 1;
 357       len -= cc;
 358       str += cc;
 359     }
 360   return 0;
 361 }
 362
 363 static void
 364 hardwire_restore(scb)
 365      serial_t scb;
 366 {
 367 }
 368
 369 static void
 370 hardwire_close(scb)
 371      serial_t scb;
 372 {
 373   if (scb->fd < 0)
 374     return;
 375
 376   close(scb->fd);
 377   scb->fd = -1;
 378 }
 379
 380 static struct serial_ops hardwire_ops =
 381 {
 382   "hardwire",
 383   0,
 384   hardwire_open,
 385   hardwire_close,
 386   hardwire_readchar,
 387   hardwire_write,
 388   hardwire_raw,
 389   hardwire_restore,
 390   hardwire_setbaudrate
 391 };
 392
 393 _initialize_ser_hardwire ()
 394 {
 395   serial_add_interface (&hardwire_ops);
 396 }