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 #if !defined (HAVE_TERMIOS) && !defined (HAVE_TERMIO) && !defined (HAVE_SGTTY)
  26 #define HAVE_SGTTY
  27 #endif
  28
  29 #ifdef HAVE_TERMIOS
  30 #include <termios.h>
  31 #include <unistd.h>
  32
  33 struct hardwire_ttystate
  34 {
  35   struct termios termios;
  36   pid_t process_group;
  37 };
  38 #endif /* termios */
  39
  40 #ifdef HAVE_TERMIO
  41 #include <termio.h>
  42
  43 /* It is believed that all systems which have added job control to SVR3
  44    (e.g. sco) have also added termios.  Even if not, trying to figure out
  45    all the variations (TIOCGPGRP vs. TCGETPGRP, etc.) would be pretty
  46    bewildering.  So we don't attempt it.  */
  47
  48 struct hardwire_ttystate
  49 {
  50   struct termio termio;
  51 };
  52 #endif /* termio */
  53
  54 #ifdef HAVE_SGTTY
  55 /* Needed for the code which uses select().  We would include <sys/select.h>
  56    too if it existed on all systems.  */
  57 #include <sys/time.h>
  58
  59 #include <sgtty.h>
  60
  61 struct hardwire_ttystate
  62 {
  63   struct sgttyb sgttyb;
  64   struct tchars tc;
  65   struct ltchars ltc;
  66   /* Line discipline flags.  */
  67   int lmode;
  68
  69 #ifdef SHORT_PGRP
  70   /* This is only used for the ultra.  Does it have pid_t?  */
  71   short process_group;
  72 #else
  73   int process_group;
  74 #endif
  75 };
  76 #endif /* sgtty */
  77
  78 static int hardwire_open PARAMS ((serial_t scb, const char *name));
  79 static void hardwire_raw PARAMS ((serial_t scb));
  80 static int wait_for PARAMS ((serial_t scb, int timeout));
  81 static int hardwire_readchar PARAMS ((serial_t scb, int timeout));
  82 static int rate_to_code PARAMS ((int rate));
  83 static int hardwire_setbaudrate PARAMS ((serial_t scb, int rate));
  84 static int hardwire_write PARAMS ((serial_t scb, const char *str, int len));
  85 static void hardwire_restore PARAMS ((serial_t scb));
  86 static void hardwire_close PARAMS ((serial_t scb));
  87 static int get_tty_state PARAMS ((serial_t scb, struct hardwire_ttystate *state));
  88 static int set_tty_state PARAMS ((serial_t scb, struct hardwire_ttystate *state));
  89 static serial_ttystate hardwire_get_tty_state PARAMS ((serial_t scb));
  90 static int hardwire_set_tty_state PARAMS ((serial_t scb, serial_ttystate state));
  91
  92 /* Open up a real live device for serial I/O */
  93
  94 static int
  95 hardwire_open(scb, name)
  96      serial_t scb;
  97      const char *name;
  98 {
  99   scb->fd = open (name, O_RDWR);
 100   if (scb->fd < 0)
 101     return -1;
 102
 103   return 0;
 104 }
 105
 106 static int
 107 get_tty_state(scb, state)
 108      serial_t scb;
 109      struct hardwire_ttystate *state;
 110 {
 111 #ifdef HAVE_TERMIOS
 112   pid_t new_process_group;
 113
 114   if (tcgetattr(scb->fd, &state->termios) < 0)
 115     return -1;
 116
 117   if (!job_control)
 118     return 0;
 119
 120   new_process_group = tcgetpgrp (scb->fd);
 121   if (new_process_group == (pid_t)-1)
 122     return -1;
 123   state->process_group = new_process_group;
 124   return 0;
 125 #endif
 126
 127 #ifdef HAVE_TERMIO
 128   if (ioctl (scb->fd, TCGETA, &state->termio) < 0)
 129     return -1;
 130   return 0;
 131 #endif
 132
 133 #ifdef HAVE_SGTTY
 134   if (ioctl (scb->fd, TIOCGETP, &state->sgttyb) < 0)
 135     return -1;
 136   if (ioctl (scb->fd, TIOCGETC, &state->tc) < 0)
 137     return -1;
 138   if (ioctl (scb->fd, TIOCGLTC, &state->ltc) < 0)
 139     return -1;
 140   if (ioctl (scb->fd, TIOCLGET, &state->lmode) < 0)
 141     return -1;
 142
 143   if (!job_control)
 144     return 0;
 145
 146   return ioctl (scb->fd, TIOCGPGRP, &state->process_group);
 147 #endif
 148 }
 149
 150 static int
 151 set_tty_state(scb, state)
 152      serial_t scb;
 153      struct hardwire_ttystate *state;
 154 {
 155 #ifdef HAVE_TERMIOS
 156   if (tcsetattr(scb->fd, TCSANOW, &state->termios) < 0)
 157     return -1;
 158
 159   if (!job_control)
 160     return 0;
 161
 162   return tcsetpgrp (scb->fd, state->process_group);
 163 #endif
 164
 165 #ifdef HAVE_TERMIO
 166   if (ioctl (scb->fd, TCSETA, &state->termio) < 0)
 167     return -1;
 168   return 0;
 169 #endif
 170
 171 #ifdef HAVE_SGTTY
 172   if (ioctl (scb->fd, TIOCSETN, &state->sgttyb) < 0)
 173     return -1;
 174
 175   if (!job_control)
 176     return 0;
 177
 178   return ioctl (scb->fd, TIOCSPGRP, &state->process_group);
 179 #endif
 180 }
 181
 182 static serial_ttystate
 183 hardwire_get_tty_state(scb)
 184      serial_t scb;
 185 {
 186   struct hardwire_ttystate *state;
 187
 188   state = (struct hardwire_ttystate *)xmalloc(sizeof *state);
 189
 190   if (get_tty_state(scb, state))
 191     return NULL;
 192
 193   return (serial_ttystate)state;
 194 }
 195
 196 static int
 197 hardwire_set_tty_state(scb, ttystate)
 198      serial_t scb;
 199      serial_ttystate ttystate;
 200 {
 201   struct hardwire_ttystate *state;
 202
 203   state = (struct hardwire_ttystate *)ttystate;
 204
 205   return set_tty_state(scb, state);
 206 }
 207
 208 static int
 209 hardwire_noflush_set_tty_state (scb, new_ttystate, old_ttystate)
 210      serial_t scb;
 211      serial_ttystate new_ttystate;
 212      serial_ttystate old_ttystate;
 213 {
 214   struct hardwire_ttystate new_state;
 215   struct hardwire_ttystate *state = (struct hardwire_ttystate *) old_ttystate;
 216
 217   new_state = *(struct hardwire_ttystate *)new_ttystate;
 218
 219 #ifdef HAVE_TERMIOS
 220   /* I'm not sure whether this is necessary; the manpage makes no mention
 221      of discarding input when switching to/from ICANON.  */
 222   if (state->termios.c_lflag & ICANON)
 223     new_state.termios.c_lflag |= ICANON;
 224   else
 225     new_state.termios.c_lflag &= ~ICANON;
 226 #endif
 227
 228 #ifdef HAVE_TERMIO
 229   /* I'm not sure whether this is necessary; the manpage makes no mention
 230      of discarding input when switching to/from ICANON.  */
 231   if (state->termio.c_lflag & ICANON)
 232     new_state.termio.c_lflag |= ICANON;
 233   else
 234     new_state.termio.c_lflag &= ~ICANON;
 235 #endif
 236
 237 #ifdef HAVE_SGTTY
 238   if (state->sgttyb.sg_flags & RAW)
 239     new_state.sgttyb.sg_flags |= RAW;
 240   else
 241     new_state.sgttyb.sg_flags &= ~RAW;
 242
 243   /* I'm not sure whether this is necessary; the manpage just mentions
 244      RAW not CBREAK.  */
 245   if (state->sgttyb.sg_flags & CBREAK)
 246     new_state.sgttyb.sg_flags |= CBREAK;
 247   else
 248     new_state.sgttyb.sg_flags &= ~CBREAK;
 249 #endif
 250
 251   return set_tty_state (scb, &new_state);
 252 }
 253
 254 static void
 255 hardwire_print_tty_state (scb, ttystate)
 256      serial_t scb;
 257      serial_ttystate ttystate;
 258 {
 259   struct hardwire_ttystate *state = (struct hardwire_ttystate *) ttystate;
 260   int i;
 261
 262 #ifdef HAVE_TERMIOS
 263   printf_filtered ("Process group = %d\n", state->process_group);
 264
 265   printf_filtered ("c_iflag = 0x%x, c_oflag = 0x%x,\n",
 266                    state->termios.c_iflag, state->termios.c_oflag);
 267   printf_filtered ("c_cflag = 0x%x, c_lflag = 0x%x\n",
 268                    state->termios.c_cflag, state->termios.c_lflag);
 269 #if 0
 270   /* This not in POSIX, and is not really documented by those systems
 271      which have it (at least not Sun).  */
 272   printf_filtered ("c_line = 0x%x.\n", state->termios.c_line);
 273 #endif
 274   printf_filtered ("c_cc: ");
 275   for (i = 0; i < NCCS; i += 1)
 276     printf_filtered ("0x%x ", state->termios.c_cc[i]);
 277   printf_filtered ("\n");
 278 #endif
 279
 280 #ifdef HAVE_TERMIO
 281   printf_filtered ("c_iflag = 0x%x, c_oflag = 0x%x,\n",
 282                    state->termio.c_iflag, state->termio.c_oflag);
 283   printf_filtered ("c_cflag = 0x%x, c_lflag = 0x%x, c_line = 0x%x.\n",
 284                    state->termio.c_cflag, state->termio.c_lflag,
 285                    state->termio.c_line);
 286   printf_filtered ("c_cc: ");
 287   for (i = 0; i < NCC; i += 1)
 288     printf_filtered ("0x%x ", state->termio.c_cc[i]);
 289   printf_filtered ("\n");
 290 #endif
 291
 292 #ifdef HAVE_SGTTY
 293   printf_filtered ("Process group = %d\n", state->process_group);
 294
 295   printf_filtered ("sgttyb.sg_flags = 0x%x.\n", state->sgttyb.sg_flags);
 296
 297   printf_filtered ("tchars: ");
 298   for (i = 0; i < (int)sizeof (struct tchars); i++)
 299     printf_filtered ("0x%x ", ((unsigned char *)&state->tc)[i]);
 300   printf_filtered ("\n");
 301
 302   printf_filtered ("ltchars: ");
 303   for (i = 0; i < (int)sizeof (struct ltchars); i++)
 304     printf_filtered ("0x%x ", ((unsigned char *)&state->ltc)[i]);
 305   printf_filtered ("\n");
 306
 307   printf_filtered ("lmode:  0x%x\n", state->lmode);
 308 #endif
 309 }
 310
 311 static int
 312 hardwire_flush_output (scb)
 313      serial_t scb;
 314 {
 315 #ifdef HAVE_TERMIOS
 316   return tcflush (scb->fd, TCOFLUSH);
 317 #endif
 318
 319 #ifdef HAVE_TERMIO
 320   return ioctl (scb->fd, TCFLSH, 1);
 321 #endif
 322
 323 #ifdef HAVE_SGTTY
 324   /* This flushes both input and output, but we can't do better.  */
 325   return ioctl (scb->fd, TIOCFLUSH, 0);
 326 #endif
 327 }
 328
 329 static int
 330 hardwire_flush_input (scb)
 331      serial_t scb;
 332 {
 333 #ifdef HAVE_TERMIOS
 334   return tcflush (scb->fd, TCIFLUSH);
 335 #endif
 336
 337 #ifdef HAVE_TERMIO
 338   return ioctl (scb->fd, TCFLSH, 0);
 339 #endif
 340
 341 #ifdef HAVE_SGTTY
 342   /* This flushes both input and output, but we can't do better.  */
 343   return ioctl (scb->fd, TIOCFLUSH, 0);
 344 #endif
 345 }
 346
 347 static int
 348 hardwire_send_break (scb)
 349      serial_t scb;
 350 {
 351   int status;
 352
 353 #ifdef HAVE_TERMIOS
 354   return tcsendbreak (scb->fd, 0);
 355 #endif
 356
 357 #ifdef HAVE_TERMIO
 358   return ioctl (scb->fd, TCSBRK, 0);
 359 #endif
 360
 361 #ifdef HAVE_SGTTY
 362   status = ioctl (scb->fd, TIOCSBRK, 0);
 363   usleep (250000);
 364   status = ioctl (scb->fd, TIOCCBRK, 0);
 365   return status;
 366 #endif
 367 }
 368
 369 static void
 370 hardwire_raw(scb)
 371      serial_t scb;
 372 {
 373   struct hardwire_ttystate state;
 374
 375   if (get_tty_state(scb, &state))
 376     fprintf(stderr, "get_tty_state failed: %s\n", safe_strerror(errno));
 377
 378 #ifdef HAVE_TERMIOS
 379   state.termios.c_iflag = 0;
 380   state.termios.c_oflag = 0;
 381   state.termios.c_lflag = 0;
 382   state.termios.c_cflag &= ~(CSIZE|PARENB);
 383   state.termios.c_cflag |= CS8;
 384   state.termios.c_cc[VMIN] = 0;
 385   state.termios.c_cc[VTIME] = 0;
 386 #endif
 387
 388 #ifdef HAVE_TERMIO
 389   state.termio.c_iflag = 0;
 390   state.termio.c_oflag = 0;
 391   state.termio.c_lflag = 0;
 392   state.termio.c_cflag &= ~(CSIZE|PARENB);
 393   state.termio.c_cflag |= CS8;
 394   state.termio.c_cc[VMIN] = 0;
 395   state.termio.c_cc[VTIME] = 0;
 396 #endif
 397
 398 #ifdef HAVE_SGTTY
 399   state.sgttyb.sg_flags |= RAW | ANYP;
 400   state.sgttyb.sg_flags &= ~(CBREAK | ECHO);
 401 #endif
 402
 403   scb->current_timeout = 0;
 404
 405   if (set_tty_state (scb, &state))
 406     fprintf(stderr, "set_tty_state failed: %s\n", safe_strerror(errno));
 407 }
 408
 409 /* Wait for input on scb, with timeout seconds.  Returns 0 on success,
 410    otherwise SERIAL_TIMEOUT or SERIAL_ERROR.
 411
 412    For termio{s}, we actually just setup VTIME if necessary, and let the
 413    timeout occur in the read() in hardwire_read().
 414  */
 415
 416 static int
 417 wait_for(scb, timeout)
 418      serial_t scb;
 419      int timeout;
 420 {
 421   int numfds;
 422
 423 #ifdef HAVE_SGTTY
 424   struct timeval tv;
 425   fd_set readfds;
 426
 427   FD_ZERO (&readfds);
 428
 429   tv.tv_sec = timeout;
 430   tv.tv_usec = 0;
 431
 432   FD_SET(scb->fd, &readfds);
 433
 434   while (1)
 435     {
 436       if (timeout >= 0)
 437         numfds = select(scb->fd+1, &readfds, 0, 0, &tv);
 438       else
 439         numfds = select(scb->fd+1, &readfds, 0, 0, 0);
 440
 441       if (numfds <= 0)
 442         if (numfds == 0)
 443           return SERIAL_TIMEOUT;
 444         else if (errno == EINTR)
 445           continue;
 446         else
 447           return SERIAL_ERROR;  /* Got an error from select or poll */
 448
 449       return 0;
 450     }
 451
 452 #endif  /* HAVE_SGTTY */
 453
 454 #if defined HAVE_TERMIO || defined HAVE_TERMIOS
 455   if (timeout == scb->current_timeout)
 456     return 0;
 457
 458   {
 459     struct hardwire_ttystate state;
 460
 461     if (get_tty_state(scb, &state))
 462       fprintf(stderr, "get_tty_state failed: %s\n", safe_strerror(errno));
 463
 464 #ifdef HAVE_TERMIOS
 465     state.termios.c_cc[VTIME] = timeout * 10;
 466 #endif
 467
 468 #ifdef HAVE_TERMIO
 469     state.termio.c_cc[VTIME] = timeout * 10;
 470 #endif
 471
 472     scb->current_timeout = timeout;
 473
 474     if (set_tty_state (scb, &state))
 475       fprintf(stderr, "set_tty_state failed: %s\n", safe_strerror(errno));
 476
 477     return 0;
 478   }
 479 #endif  /* HAVE_TERMIO || HAVE_TERMIOS */
 480 }
 481
 482 /* Read a character with user-specified timeout.  TIMEOUT is number of seconds
 483    to wait, or -1 to wait forever.  Use timeout of 0 to effect a poll.  Returns
 484    char if successful.  Returns -2 if timeout expired, EOF if line dropped
 485    dead, or -3 for any other error (see errno in that case). */
 486
 487 static int
 488 hardwire_readchar(scb, timeout)
 489      serial_t scb;
 490      int timeout;
 491 {
 492   int status;
 493
 494   if (scb->bufcnt-- > 0)
 495     return *scb->bufp++;
 496
 497   status = wait_for(scb, timeout);
 498
 499   if (status < 0)
 500     return status;
 501
 502   scb->bufcnt = read(scb->fd, scb->buf, BUFSIZ);
 503
 504   if (scb->bufcnt <= 0)
 505     if (scb->bufcnt == 0)
 506       return SERIAL_TIMEOUT;    /* 0 chars means timeout [may need to
 507                                    distinguish between EOF & timeouts
 508                                    someday] */
 509     else
 510       return SERIAL_ERROR;      /* Got an error from read */
 511
 512   scb->bufcnt--;
 513   scb->bufp = scb->buf;
 514   return *scb->bufp++;
 515 }
 516
 517 #ifndef B19200
 518 #define B19200 EXTA
 519 #endif
 520
 521 #ifndef B38400
 522 #define B38400 EXTB
 523 #endif
 524
 525 /* Translate baud rates from integers to damn B_codes.  Unix should
 526    have outgrown this crap years ago, but even POSIX wouldn't buck it.  */
 527
 528 static struct
 529 {
 530   int rate;
 531   int code;
 532 }
 533 baudtab[] =
 534 {
 535   {50, B50},
 536   {75, B75},
 537   {110, B110},
 538   {134, B134},
 539   {150, B150},
 540   {200, B200},
 541   {300, B300},
 542   {600, B600},
 543   {1200, B1200},
 544   {1800, B1800},
 545   {2400, B2400},
 546   {4800, B4800},
 547   {9600, B9600},
 548   {19200, B19200},
 549   {38400, B38400},
 550   {-1, -1},
 551 };
 552
 553 static int
 554 rate_to_code(rate)
 555      int rate;
 556 {
 557   int i;
 558
 559   for (i = 0; baudtab[i].rate != -1; i++)
 560     if (rate == baudtab[i].rate)
 561       return baudtab[i].code;
 562
 563   return -1;
 564 }
 565
 566 static int
 567 hardwire_setbaudrate(scb, rate)
 568      serial_t scb;
 569      int rate;
 570 {
 571   struct hardwire_ttystate state;
 572
 573   if (get_tty_state(scb, &state))
 574     return -1;
 575
 576 #ifdef HAVE_TERMIOS
 577   cfsetospeed (&state.termios, rate_to_code (rate));
 578   cfsetispeed (&state.termios, rate_to_code (rate));
 579 #endif
 580
 581 #ifdef HAVE_TERMIO
 582 #ifndef CIBAUD
 583 #define CIBAUD CBAUD
 584 #endif
 585
 586   state.termio.c_cflag &= ~(CBAUD | CIBAUD);
 587   state.termio.c_cflag |= rate_to_code (rate);
 588 #endif
 589
 590 #ifdef HAVE_SGTTY
 591   state.sgttyb.sg_ispeed = rate_to_code (rate);
 592   state.sgttyb.sg_ospeed = rate_to_code (rate);
 593 #endif
 594
 595   return set_tty_state (scb, &state);
 596 }
 597
 598 static int
 599 hardwire_set_process_group (scb, ttystate, group)
 600      serial_t scb;
 601      serial_ttystate ttystate;
 602      int group;
 603 {
 604 #if defined (HAVE_SGTTY) || defined (HAVE_TERMIOS)
 605   ((struct hardwire_ttystate *)ttystate)->process_group = group;
 606 #endif
 607   return 0;
 608 }
 609
 610 static int
 611 hardwire_write(scb, str, len)
 612      serial_t scb;
 613      const char *str;
 614      int len;
 615 {
 616   int cc;
 617
 618   while (len > 0)
 619     {
 620       cc = write(scb->fd, str, len);
 621
 622       if (cc < 0)
 623         return 1;
 624       len -= cc;
 625       str += cc;
 626     }
 627   return 0;
 628 }
 629
 630 static void
 631 hardwire_close(scb)
 632      serial_t scb;
 633 {
 634   if (scb->fd < 0)
 635     return;
 636
 637   close(scb->fd);
 638   scb->fd = -1;
 639 }
 640
 641 static struct serial_ops hardwire_ops =
 642 {
 643   "hardwire",
 644   0,
 645   hardwire_open,
 646   hardwire_close,
 647   hardwire_readchar,
 648   hardwire_write,
 649   hardwire_flush_output,
 650   hardwire_flush_input,
 651   hardwire_send_break,
 652   hardwire_raw,
 653   hardwire_get_tty_state,
 654   hardwire_set_tty_state,
 655   hardwire_print_tty_state,
 656   hardwire_noflush_set_tty_state,
 657   hardwire_setbaudrate,
 658   hardwire_set_process_group
 659 };
 660
 661 int job_control;
 662 #if defined (HAVE_TERMIOS)
 663 #include <unistd.h>
 664 #endif
 665
 666 /* This is here because this is where we figure out whether we (probably)
 667    have job control.  Just using job_control only does part of it because
 668    setpgid or setpgrp might not exist on a system without job control.
 669    It might be considered misplaced (on the other hand, process groups and
 670    job control are closely related to ttys).
 671
 672    For a more clean implementation, in libiberty, put a setpgid which merely
 673    calls setpgrp and a setpgrp which does nothing (any system with job control
 674    will have one or the other).  */
 675 int
 676 gdb_setpgid ()
 677 {
 678   int retval = 0;
 679   if (job_control)
 680     {
 681 #if defined (NEED_POSIX_SETPGID) || defined (HAVE_TERMIOS)
 682       /* Do all systems with termios have setpgid?  I hope so.  */
 683       /* setpgid (0, 0) is supposed to work and mean the same thing as
 684          this, but on Ultrix 4.2A it fails with EPERM (and
 685          setpgid (getpid (), getpid ()) succeeds).  */
 686       retval = setpgid (getpid (), getpid ());
 687 #else
 688 #if defined (TIOCGPGRP)
 689 #if defined(USG) && !defined(SETPGRP_ARGS)
 690       retval = setpgrp ();
 691 #else
 692       retval = setpgrp (getpid (), getpid ());
 693 #endif /* USG */
 694 #endif /* TIOCGPGRP.  */
 695 #endif /* NEED_POSIX_SETPGID */
 696     }
 697   return retval;
 698 }
 699
 700 void
 701 _initialize_ser_hardwire ()
 702 {
 703   serial_add_interface (&hardwire_ops);
 704
 705   /* OK, figure out whether we have job control.  */
 706
 707 #if defined (HAVE_TERMIOS)
 708   /* Do all systems with termios have the POSIX way of identifying job
 709      control?  I hope so.  */
 710 #ifdef _POSIX_JOB_CONTROL
 711   job_control = 1;
 712 #else
 713   job_control = sysconf (_SC_JOB_CONTROL);
 714 #endif
 715 #endif /* termios */
 716
 717 #ifdef HAVE_TERMIO
 718   /* See comment at top of file about trying to support process groups
 719      with termio.  */
 720   job_control = 0;
 721 #endif /* termio */
 722
 723 #ifdef HAVE_SGTTY
 724 #ifdef TIOCGPGRP
 725   job_control = 1;
 726 #else
 727   job_control = 0;
 728 #endif /* TIOCGPGRP */
 729 #endif /* sgtty */
 730
 731 }