gdb/serial.c

   1 /* Generic serial interface routines
   2
   3    Copyright (C) 1992-2013 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include <ctype.h>
  22 #include "serial.h"
  23 #include "gdb_string.h"
  24 #include "gdbcmd.h"
  25 #include "cli/cli-utils.h"
  26
  27 extern void _initialize_serial (void);
  28
  29 /* Is serial being debugged?  */
  30
  31 static unsigned int global_serial_debug_p;
  32
  33 /* Linked list of serial I/O handlers.  */
  34
  35 static struct serial_ops *serial_ops_list = NULL;
  36
  37 /* Pointer to list of scb's.  */
  38
  39 static struct serial *scb_base;
  40
  41 /* Non-NULL gives filename which contains a recording of the remote session,
  42    suitable for playback by gdbserver.  */
  43
  44 static char *serial_logfile = NULL;
  45 static struct ui_file *serial_logfp = NULL;
  46
  47 static struct serial_ops *serial_interface_lookup (const char *);
  48 static void serial_logchar (struct ui_file *stream,
  49                             int ch_type, int ch, int timeout);
  50 static const char logbase_hex[] = "hex";
  51 static const char logbase_octal[] = "octal";
  52 static const char logbase_ascii[] = "ascii";
  53 static const char *const logbase_enums[] =
  54 {logbase_hex, logbase_octal, logbase_ascii, NULL};
  55 static const char *serial_logbase = logbase_ascii;
  56 \f
  57
  58 static int serial_current_type = 0;
  59
  60 /* Log char CH of type CHTYPE, with TIMEOUT.  */
  61
  62 /* Define bogus char to represent a BREAK.  Should be careful to choose a value
  63    that can't be confused with a normal char, or an error code.  */
  64 #define SERIAL_BREAK 1235
  65
  66 static void
  67 serial_logchar (struct ui_file *stream, int ch_type, int ch, int timeout)
  68 {
  69   if (ch_type != serial_current_type)
  70     {
  71       fprintf_unfiltered (stream, "\n%c ", ch_type);
  72       serial_current_type = ch_type;
  73     }
  74
  75   if (serial_logbase != logbase_ascii)
  76     fputc_unfiltered (' ', stream);
  77
  78   switch (ch)
  79     {
  80     case SERIAL_TIMEOUT:
  81       fprintf_unfiltered (stream, "<Timeout: %d seconds>", timeout);
  82       return;
  83     case SERIAL_ERROR:
  84       fprintf_unfiltered (stream, "<Error: %s>", safe_strerror (errno));
  85       return;
  86     case SERIAL_EOF:
  87       fputs_unfiltered ("<Eof>", stream);
  88       return;
  89     case SERIAL_BREAK:
  90       fputs_unfiltered ("<Break>", stream);
  91       return;
  92     default:
  93       if (serial_logbase == logbase_hex)
  94         fprintf_unfiltered (stream, "%02x", ch & 0xff);
  95       else if (serial_logbase == logbase_octal)
  96         fprintf_unfiltered (stream, "%03o", ch & 0xff);
  97       else
  98         switch (ch)
  99           {
 100           case '\\':
 101             fputs_unfiltered ("\\\\", stream);
 102             break;
 103           case '\b':
 104             fputs_unfiltered ("\\b", stream);
 105             break;
 106           case '\f':
 107             fputs_unfiltered ("\\f", stream);
 108             break;
 109           case '\n':
 110             fputs_unfiltered ("\\n", stream);
 111             break;
 112           case '\r':
 113             fputs_unfiltered ("\\r", stream);
 114             break;
 115           case '\t':
 116             fputs_unfiltered ("\\t", stream);
 117             break;
 118           case '\v':
 119             fputs_unfiltered ("\\v", stream);
 120             break;
 121           default:
 122             fprintf_unfiltered (stream,
 123                                 isprint (ch) ? "%c" : "\\x%02x", ch & 0xFF);
 124             break;
 125           }
 126     }
 127 }
 128
 129 void
 130 serial_log_command (const char *cmd)
 131 {
 132   if (!serial_logfp)
 133     return;
 134
 135   serial_current_type = 'c';
 136
 137   fputs_unfiltered ("\nc ", serial_logfp);
 138   fputs_unfiltered (cmd, serial_logfp);
 139
 140   /* Make sure that the log file is as up-to-date as possible,
 141      in case we are getting ready to dump core or something.  */
 142   gdb_flush (serial_logfp);
 143 }
 144
 145 \f
 146 static struct serial_ops *
 147 serial_interface_lookup (const char *name)
 148 {
 149   struct serial_ops *ops;
 150
 151   for (ops = serial_ops_list; ops; ops = ops->next)
 152     if (strcmp (name, ops->name) == 0)
 153       return ops;
 154
 155   return NULL;
 156 }
 157
 158 void
 159 serial_add_interface (struct serial_ops *optable)
 160 {
 161   optable->next = serial_ops_list;
 162   serial_ops_list = optable;
 163 }
 164
 165 /* Return the open serial device for FD, if found, or NULL if FD is
 166    not already opened.  */
 167
 168 struct serial *
 169 serial_for_fd (int fd)
 170 {
 171   struct serial *scb;
 172
 173   for (scb = scb_base; scb; scb = scb->next)
 174     if (scb->fd == fd)
 175       return scb;
 176
 177   return NULL;
 178 }
 179
 180 /* Open up a device or a network socket, depending upon the syntax of NAME.  */
 181
 182 struct serial *
 183 serial_open (const char *name)
 184 {
 185   struct serial *scb;
 186   struct serial_ops *ops;
 187   const char *open_name = name;
 188
 189   if (strcmp (name, "pc") == 0)
 190     ops = serial_interface_lookup ("pc");
 191   else if (strncmp (name, "lpt", 3) == 0)
 192     ops = serial_interface_lookup ("parallel");
 193   else if (strncmp (name, "|", 1) == 0)
 194     {
 195       ops = serial_interface_lookup ("pipe");
 196       /* Discard ``|'' and any space before the command itself.  */
 197       ++open_name;
 198       open_name = skip_spaces_const (open_name);
 199     }
 200   /* Check for a colon, suggesting an IP address/port pair.
 201      Do this *after* checking for all the interesting prefixes.  We
 202      don't want to constrain the syntax of what can follow them.  */
 203   else if (strchr (name, ':'))
 204     ops = serial_interface_lookup ("tcp");
 205   else
 206     ops = serial_interface_lookup ("hardwire");
 207
 208   if (!ops)
 209     return NULL;
 210
 211   scb = XMALLOC (struct serial);
 212
 213   scb->ops = ops;
 214
 215   scb->bufcnt = 0;
 216   scb->bufp = scb->buf;
 217   scb->error_fd = -1;
 218   scb->refcnt = 1;
 219
 220   /* `...->open (...)' would get expanded by the open(2) syscall macro.  */
 221   if ((*scb->ops->open) (scb, open_name))
 222     {
 223       xfree (scb);
 224       return NULL;
 225     }
 226
 227   scb->name = xstrdup (name);
 228   scb->next = scb_base;
 229   scb->debug_p = 0;
 230   scb->async_state = 0;
 231   scb->async_handler = NULL;
 232   scb->async_context = NULL;
 233   scb_base = scb;
 234
 235   if (serial_logfile != NULL)
 236     {
 237       serial_logfp = gdb_fopen (serial_logfile, "w");
 238       if (serial_logfp == NULL)
 239         perror_with_name (serial_logfile);
 240     }
 241
 242   return scb;
 243 }
 244
 245 /* Open a new serial stream using a file handle, using serial
 246    interface ops OPS.  */
 247
 248 static struct serial *
 249 serial_fdopen_ops (const int fd, struct serial_ops *ops)
 250 {
 251   struct serial *scb;
 252
 253   if (!ops)
 254     {
 255       ops = serial_interface_lookup ("terminal");
 256       if (!ops)
 257         ops = serial_interface_lookup ("hardwire");
 258     }
 259
 260   if (!ops)
 261     return NULL;
 262
 263   scb = XCALLOC (1, struct serial);
 264
 265   scb->ops = ops;
 266
 267   scb->bufcnt = 0;
 268   scb->bufp = scb->buf;
 269   scb->error_fd = -1;
 270   scb->refcnt = 1;
 271
 272   scb->name = NULL;
 273   scb->next = scb_base;
 274   scb->debug_p = 0;
 275   scb->async_state = 0;
 276   scb->async_handler = NULL;
 277   scb->async_context = NULL;
 278   scb_base = scb;
 279
 280   if ((ops->fdopen) != NULL)
 281     (*ops->fdopen) (scb, fd);
 282   else
 283     scb->fd = fd;
 284
 285   return scb;
 286 }
 287
 288 struct serial *
 289 serial_fdopen (const int fd)
 290 {
 291   return serial_fdopen_ops (fd, NULL);
 292 }
 293
 294 static void
 295 do_serial_close (struct serial *scb, int really_close)
 296 {
 297   struct serial *tmp_scb;
 298
 299   if (serial_logfp)
 300     {
 301       fputs_unfiltered ("\nEnd of log\n", serial_logfp);
 302       serial_current_type = 0;
 303
 304       /* XXX - What if serial_logfp == gdb_stdout or gdb_stderr?  */
 305       ui_file_delete (serial_logfp);
 306       serial_logfp = NULL;
 307     }
 308
 309   /* ensure that the FD has been taken out of async mode.  */
 310   if (scb->async_handler != NULL)
 311     serial_async (scb, NULL, NULL);
 312
 313   if (really_close)
 314     scb->ops->close (scb);
 315
 316   if (scb->name)
 317     xfree (scb->name);
 318
 319   /* For serial_is_open.  */
 320   scb->bufp = NULL;
 321
 322   if (scb_base == scb)
 323     scb_base = scb_base->next;
 324   else
 325     for (tmp_scb = scb_base; tmp_scb; tmp_scb = tmp_scb->next)
 326       {
 327         if (tmp_scb->next != scb)
 328           continue;
 329
 330         tmp_scb->next = tmp_scb->next->next;
 331         break;
 332       }
 333
 334   serial_unref (scb);
 335 }
 336
 337 void
 338 serial_close (struct serial *scb)
 339 {
 340   do_serial_close (scb, 1);
 341 }
 342
 343 void
 344 serial_un_fdopen (struct serial *scb)
 345 {
 346   do_serial_close (scb, 0);
 347 }
 348
 349 int
 350 serial_is_open (struct serial *scb)
 351 {
 352   return scb->bufp != NULL;
 353 }
 354
 355 void
 356 serial_ref (struct serial *scb)
 357 {
 358   scb->refcnt++;
 359 }
 360
 361 void
 362 serial_unref (struct serial *scb)
 363 {
 364   --scb->refcnt;
 365   if (scb->refcnt == 0)
 366     xfree (scb);
 367 }
 368
 369 int
 370 serial_readchar (struct serial *scb, int timeout)
 371 {
 372   int ch;
 373
 374   /* FIXME: cagney/1999-10-11: Don't enable this check until the ASYNC
 375      code is finished.  */
 376   if (0 && serial_is_async_p (scb) && timeout < 0)
 377     internal_error (__FILE__, __LINE__,
 378                     _("serial_readchar: blocking read in async mode"));
 379
 380   ch = scb->ops->readchar (scb, timeout);
 381   if (serial_logfp != NULL)
 382     {
 383       serial_logchar (serial_logfp, 'r', ch, timeout);
 384
 385       /* Make sure that the log file is as up-to-date as possible,
 386          in case we are getting ready to dump core or something.  */
 387       gdb_flush (serial_logfp);
 388     }
 389   if (serial_debug_p (scb))
 390     {
 391       fprintf_unfiltered (gdb_stdlog, "[");
 392       serial_logchar (gdb_stdlog, 'r', ch, timeout);
 393       fprintf_unfiltered (gdb_stdlog, "]");
 394       gdb_flush (gdb_stdlog);
 395     }
 396
 397   return (ch);
 398 }
 399
 400 int
 401 serial_write (struct serial *scb, const void *buf, size_t count)
 402 {
 403   if (serial_logfp != NULL)
 404     {
 405       const char *str = buf;
 406       size_t c;
 407
 408       for (c = 0; c < count; c++)
 409         serial_logchar (serial_logfp, 'w', str[c] & 0xff, 0);
 410
 411       /* Make sure that the log file is as up-to-date as possible,
 412          in case we are getting ready to dump core or something.  */
 413       gdb_flush (serial_logfp);
 414     }
 415   if (serial_debug_p (scb))
 416     {
 417       const char *str = buf;
 418       size_t c;
 419
 420       for (c = 0; c < count; c++)
 421         {
 422           fprintf_unfiltered (gdb_stdlog, "[");
 423           serial_logchar (gdb_stdlog, 'w', str[count] & 0xff, 0);
 424           fprintf_unfiltered (gdb_stdlog, "]");
 425         }
 426       gdb_flush (gdb_stdlog);
 427     }
 428
 429   return (scb->ops->write (scb, buf, count));
 430 }
 431
 432 void
 433 serial_printf (struct serial *desc, const char *format,...)
 434 {
 435   va_list args;
 436   char *buf;
 437   va_start (args, format);
 438
 439   buf = xstrvprintf (format, args);
 440   serial_write (desc, buf, strlen (buf));
 441
 442   xfree (buf);
 443   va_end (args);
 444 }
 445
 446 int
 447 serial_drain_output (struct serial *scb)
 448 {
 449   return scb->ops->drain_output (scb);
 450 }
 451
 452 int
 453 serial_flush_output (struct serial *scb)
 454 {
 455   return scb->ops->flush_output (scb);
 456 }
 457
 458 int
 459 serial_flush_input (struct serial *scb)
 460 {
 461   return scb->ops->flush_input (scb);
 462 }
 463
 464 int
 465 serial_send_break (struct serial *scb)
 466 {
 467   if (serial_logfp != NULL)
 468     serial_logchar (serial_logfp, 'w', SERIAL_BREAK, 0);
 469
 470   return (scb->ops->send_break (scb));
 471 }
 472
 473 void
 474 serial_raw (struct serial *scb)
 475 {
 476   scb->ops->go_raw (scb);
 477 }
 478
 479 serial_ttystate
 480 serial_get_tty_state (struct serial *scb)
 481 {
 482   return scb->ops->get_tty_state (scb);
 483 }
 484
 485 serial_ttystate
 486 serial_copy_tty_state (struct serial *scb, serial_ttystate ttystate)
 487 {
 488   return scb->ops->copy_tty_state (scb, ttystate);
 489 }
 490
 491 int
 492 serial_set_tty_state (struct serial *scb, serial_ttystate ttystate)
 493 {
 494   return scb->ops->set_tty_state (scb, ttystate);
 495 }
 496
 497 void
 498 serial_print_tty_state (struct serial *scb,
 499                         serial_ttystate ttystate,
 500                         struct ui_file *stream)
 501 {
 502   scb->ops->print_tty_state (scb, ttystate, stream);
 503 }
 504
 505 int
 506 serial_noflush_set_tty_state (struct serial *scb,
 507                               serial_ttystate new_ttystate,
 508                               serial_ttystate old_ttystate)
 509 {
 510   return scb->ops->noflush_set_tty_state (scb, new_ttystate, old_ttystate);
 511 }
 512
 513 int
 514 serial_setbaudrate (struct serial *scb, int rate)
 515 {
 516   return scb->ops->setbaudrate (scb, rate);
 517 }
 518
 519 int
 520 serial_setstopbits (struct serial *scb, int num)
 521 {
 522   return scb->ops->setstopbits (scb, num);
 523 }
 524
 525 int
 526 serial_can_async_p (struct serial *scb)
 527 {
 528   return (scb->ops->async != NULL);
 529 }
 530
 531 int
 532 serial_is_async_p (struct serial *scb)
 533 {
 534   return (scb->ops->async != NULL) && (scb->async_handler != NULL);
 535 }
 536
 537 void
 538 serial_async (struct serial *scb,
 539               serial_event_ftype *handler,
 540               void *context)
 541 {
 542   int changed = ((scb->async_handler == NULL) != (handler == NULL));
 543
 544   scb->async_handler = handler;
 545   scb->async_context = context;
 546   /* Only change mode if there is a need.  */
 547   if (changed)
 548     scb->ops->async (scb, handler != NULL);
 549 }
 550
 551 void
 552 serial_debug (struct serial *scb, int debug_p)
 553 {
 554   scb->debug_p = debug_p;
 555 }
 556
 557 int
 558 serial_debug_p (struct serial *scb)
 559 {
 560   return scb->debug_p || global_serial_debug_p;
 561 }
 562
 563 #ifdef USE_WIN32API
 564 void
 565 serial_wait_handle (struct serial *scb, HANDLE *read, HANDLE *except)
 566 {
 567   if (scb->ops->wait_handle)
 568     scb->ops->wait_handle (scb, read, except);
 569   else
 570     {
 571       *read = (HANDLE) _get_osfhandle (scb->fd);
 572       *except = NULL;
 573     }
 574 }
 575
 576 void
 577 serial_done_wait_handle (struct serial *scb)
 578 {
 579   if (scb->ops->done_wait_handle)
 580     scb->ops->done_wait_handle (scb);
 581 }
 582 #endif
 583
 584 int
 585 serial_pipe (struct serial *scbs[2])
 586 {
 587   struct serial_ops *ops;
 588   int fildes[2];
 589
 590   ops = serial_interface_lookup ("pipe");
 591   if (!ops)
 592     {
 593       errno = ENOSYS;
 594       return -1;
 595     }
 596
 597   if (gdb_pipe (fildes) == -1)
 598     return -1;
 599
 600   scbs[0] = serial_fdopen_ops (fildes[0], ops);
 601   scbs[1] = serial_fdopen_ops (fildes[1], ops);
 602   return 0;
 603 }
 604
 605 /* Serial set/show framework.  */
 606
 607 static struct cmd_list_element *serial_set_cmdlist;
 608 static struct cmd_list_element *serial_show_cmdlist;
 609
 610 static void
 611 serial_set_cmd (char *args, int from_tty)
 612 {
 613   printf_unfiltered ("\"set serial\" must be followed "
 614                      "by the name of a command.\n");
 615   help_list (serial_set_cmdlist, "set serial ", -1, gdb_stdout);
 616 }
 617
 618 static void
 619 serial_show_cmd (char *args, int from_tty)
 620 {
 621   cmd_show_list (serial_show_cmdlist, from_tty, "");
 622 }
 623
 624
 625 void
 626 _initialize_serial (void)
 627 {
 628 #if 0
 629   add_com ("connect", class_obscure, connect_command, _("\
 630 Connect the terminal directly up to the command monitor.\n\
 631 Use <CR>~. or <CR>~^D to break out."));
 632 #endif /* 0 */
 633
 634   add_prefix_cmd ("serial", class_maintenance, serial_set_cmd, _("\
 635 Set default serial/parallel port configuration."),
 636                   &serial_set_cmdlist, "set serial ",
 637                   0/*allow-unknown*/,
 638                   &setlist);
 639
 640   add_prefix_cmd ("serial", class_maintenance, serial_show_cmd, _("\
 641 Show default serial/parallel port configuration."),
 642                   &serial_show_cmdlist, "show serial ",
 643                   0/*allow-unknown*/,
 644                   &showlist);
 645
 646   add_setshow_filename_cmd ("remotelogfile", no_class, &serial_logfile, _("\
 647 Set filename for remote session recording."), _("\
 648 Show filename for remote session recording."), _("\
 649 This file is used to record the remote session for future playback\n\
 650 by gdbserver."),
 651                             NULL,
 652                             NULL, /* FIXME: i18n: */
 653                             &setlist, &showlist);
 654
 655   add_setshow_enum_cmd ("remotelogbase", no_class, logbase_enums,
 656                         &serial_logbase, _("\
 657 Set numerical base for remote session logging"), _("\
 658 Show numerical base for remote session logging"), NULL,
 659                         NULL,
 660                         NULL, /* FIXME: i18n: */
 661                         &setlist, &showlist);
 662
 663   add_setshow_zuinteger_cmd ("serial", class_maintenance,
 664                              &global_serial_debug_p, _("\
 665 Set serial debugging."), _("\
 666 Show serial debugging."), _("\
 667 When non-zero, serial port debugging is enabled."),
 668                              NULL,
 669                              NULL, /* FIXME: i18n: */
 670                              &setdebuglist, &showdebuglist);
 671 }