gcc/ada/terminals.c

   1 /****************************************************************************
   2  *                                                                          *
   3  *                         GNAT RUN-TIME COMPONENTS                         *
   4  *                                                                          *
   5  *                            T E R M I N A L S                             *
   6  *                                                                          *
   7  *                          C Implementation File                           *
   8  *                                                                          *
   9  *                     Copyright (C) 2008-2015, AdaCore                     *
  10  *                                                                          *
  11  * GNAT is free software;  you can  redistribute it  and/or modify it under *
  12  * terms of the  GNU General Public License as published  by the Free Soft- *
  13  * ware  Foundation;  either version 3,  or (at your option) any later ver- *
  14  * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
  15  * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *
  16  * or FITNESS FOR A PARTICULAR PURPOSE.                                     *
  17  *                                                                          *
  18  * As a special exception under Section 7 of GPL version 3, you are granted *
  19  * additional permissions described in the GCC Runtime Library Exception,   *
  20  * version 3.1, as published by the Free Software Foundation.               *
  21  *                                                                          *
  22  * You should have received a copy of the GNU General Public License and    *
  23  * a copy of the GCC Runtime Library Exception along with this program;     *
  24  * see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    *
  25  * <http://www.gnu.org/licenses/>.                                          *
  26  *                                                                          *
  27  * GNAT was originally developed  by the GNAT team at  New York University. *
  28  * Extensive contributions were provided by Ada Core Technologies Inc.      *
  29  *                                                                          *
  30  ****************************************************************************/
  31
  32 /* First all usupported platforms. Add stubs for exported routines. */
  33
  34 #if defined (VMS) || defined (__vxworks) || defined (__Lynx__) \
  35   || defined (__ANDROID__) || defined (__PikeOS__)
  36
  37 #define ATTRIBUTE_UNUSED __attribute__((unused))
  38
  39 void *
  40 __gnat_new_tty (void)
  41 {
  42   return (void*)0;
  43 }
  44
  45 char *
  46 __gnat_tty_name (void* t ATTRIBUTE_UNUSED)
  47 {
  48   return (char*)0;
  49 }
  50
  51 int
  52 __gnat_interrupt_pid (int pid ATTRIBUTE_UNUSED)
  53 {
  54   return -1;
  55 }
  56
  57 int
  58 __gnat_interrupt_process (void* desc ATTRIBUTE_UNUSED)
  59 {
  60   return -1;
  61 }
  62
  63 int
  64 __gnat_setup_communication (void** desc ATTRIBUTE_UNUSED)
  65 {
  66   return -1;
  67 }
  68
  69 void
  70 __gnat_setup_parent_communication (void *d ATTRIBUTE_UNUSED,
  71                                    int *i ATTRIBUTE_UNUSED,
  72                                    int *o ATTRIBUTE_UNUSED,
  73                                    int *e ATTRIBUTE_UNUSED,
  74                                    int *p ATTRIBUTE_UNUSED)
  75 {
  76 }
  77
  78 int
  79 __gnat_setup_child_communication (void *d ATTRIBUTE_UNUSED,
  80                                   char **n ATTRIBUTE_UNUSED,
  81                                   int u ATTRIBUTE_UNUSED)
  82 {
  83   return -1;
  84 }
  85
  86 int
  87 __gnat_terminate_process (void *desc ATTRIBUTE_UNUSED)
  88 {
  89   return -1;
  90 }
  91
  92 int
  93 __gnat_tty_fd (void* t ATTRIBUTE_UNUSED)
  94 {
  95   return -1;
  96 }
  97
  98 int
  99 __gnat_tty_supported (void)
 100 {
 101   return 0;
 102 }
 103
 104 int
 105 __gnat_tty_waitpid (void *desc ATTRIBUTE_UNUSED)
 106 {
 107   return 1;
 108 }
 109
 110 void
 111 __gnat_close_tty (void* t ATTRIBUTE_UNUSED)
 112 {
 113 }
 114
 115 void
 116 __gnat_free_process (void** process ATTRIBUTE_UNUSED)
 117 {
 118 }
 119
 120 void
 121 __gnat_reset_tty (void* t ATTRIBUTE_UNUSED)
 122 {
 123 }
 124
 125 void
 126 __gnat_send_header (void* d ATTRIBUTE_UNUSED,
 127                     char h[5] ATTRIBUTE_UNUSED,
 128                     int s ATTRIBUTE_UNUSED,
 129                     int *r ATTRIBUTE_UNUSED)
 130 {
 131 }
 132
 133 void
 134 __gnat_setup_winsize (void *desc ATTRIBUTE_UNUSED,
 135                       int rows ATTRIBUTE_UNUSED,
 136                       int columns ATTRIBUTE_UNUSED)
 137 {
 138 }
 139
 140 /* For Windows platforms. */
 141
 142 #elif defined(_WIN32)
 143
 144 #include <errno.h>
 145 #include <stdio.h>
 146 #include <stdlib.h>
 147
 148 #include <windows.h>
 149
 150 #define MAXPATHLEN 1024
 151
 152 #define NILP(x) ((x) == 0)
 153 #define Qnil 0
 154 #define report_file_error(x, y) fprintf (stderr, "Error: %s\n", x);
 155 #define INTEGERP(x) 1
 156 #define XINT(x) x
 157
 158 struct TTY_Process {
 159   int pid;           /* Number of this process */
 160   PROCESS_INFORMATION procinfo;
 161   HANDLE w_infd, w_outfd;
 162   HANDLE w_forkin, w_forkout;
 163   BOOL usePipe;
 164 };
 165
 166 /* Control whether create_child cause the process to inherit GPS'
 167    error mode setting.  The default is 1, to minimize the possibility of
 168    subprocesses blocking when accessing unmounted drives.  */
 169 static int Vw32_start_process_inherit_error_mode = 1;
 170
 171 /* Control whether spawnve quotes arguments as necessary to ensure
 172    correct parsing by child process.  Because not all uses of spawnve
 173    are careful about constructing argv arrays, we make this behavior
 174    conditional (off by default, since a similar operation is already done
 175    in g-expect.adb by calling Normalize_Argument). */
 176 static int Vw32_quote_process_args = 0;
 177
 178 static DWORD AbsoluteSeek(HANDLE, DWORD);
 179 static VOID  ReadBytes(HANDLE, LPVOID, DWORD);
 180
 181 #define XFER_BUFFER_SIZE 2048
 182
 183 /* This tell if the executable we're about to launch uses a GUI interface. */
 184 /* if we can't determine it, we will return true */
 185 static int
 186 is_gui_app (char *exe)
 187 {
 188   HANDLE hImage;
 189
 190   DWORD  bytes;
 191   DWORD  iSection;
 192   DWORD  SectionOffset;
 193   DWORD  CoffHeaderOffset;
 194   DWORD  MoreDosHeader[16];
 195   CHAR   *file;
 196   size_t nlen;
 197
 198   ULONG  ntSignature;
 199
 200   IMAGE_DOS_HEADER      image_dos_header;
 201   IMAGE_FILE_HEADER     image_file_header;
 202   IMAGE_OPTIONAL_HEADER image_optional_header;
 203   IMAGE_SECTION_HEADER  image_section_header;
 204
 205   /*
 206    *  Open the reference file.
 207   */
 208   nlen = strlen (exe);
 209   file = exe;
 210   if (nlen > 2) {
 211     if (exe[0] == '"') {
 212       /* remove quotes */
 213       nlen -= 2;
 214       file = malloc ((nlen + 1) * sizeof (char));
 215       memcpy (file, &exe[1], nlen);
 216       file [nlen] = '\0';
 217     }
 218   }
 219   hImage = CreateFile(file,
 220                       GENERIC_READ,
 221                       FILE_SHARE_READ,
 222                       NULL,
 223                       OPEN_EXISTING,
 224                       FILE_ATTRIBUTE_NORMAL,
 225                       NULL);
 226
 227   if (file != exe) {
 228     free (file);
 229   }
 230
 231   if (INVALID_HANDLE_VALUE == hImage)
 232     {
 233       report_file_error ("Could not open exe: ", Qnil);
 234       report_file_error (exe, Qnil);
 235       report_file_error ("\n", Qnil);
 236       CloseHandle (hImage);
 237       return -1;
 238     }
 239
 240   /*
 241    *  Read the MS-DOS image header.
 242    */
 243   ReadBytes(hImage, &image_dos_header, sizeof(IMAGE_DOS_HEADER));
 244
 245   if (IMAGE_DOS_SIGNATURE != image_dos_header.e_magic)
 246     {
 247       report_file_error("Sorry, I do not understand this file.\n", Qnil);
 248       CloseHandle (hImage);
 249       return -1;
 250     }
 251
 252   /*
 253    *  Read more MS-DOS header.       */
 254   ReadBytes(hImage, MoreDosHeader, sizeof(MoreDosHeader));
 255    /*
 256    *  Get actual COFF header.
 257    */
 258   CoffHeaderOffset = AbsoluteSeek(hImage, image_dos_header.e_lfanew) +
 259                      sizeof(ULONG);
 260   if (CoffHeaderOffset < 0) {
 261     CloseHandle (hImage);
 262     return -1;
 263   }
 264
 265   ReadBytes (hImage, &ntSignature, sizeof(ULONG));
 266
 267   if (IMAGE_NT_SIGNATURE != ntSignature)
 268     {
 269       report_file_error ("Missing NT signature. Unknown file type.\n", Qnil);
 270       CloseHandle (hImage);
 271       return -1;
 272     }
 273
 274   SectionOffset = CoffHeaderOffset + IMAGE_SIZEOF_FILE_HEADER +
 275     IMAGE_SIZEOF_NT_OPTIONAL_HEADER;
 276
 277   ReadBytes(hImage, &image_file_header, IMAGE_SIZEOF_FILE_HEADER);
 278
 279   /*
 280    *  Read optional header.
 281    */
 282   ReadBytes(hImage,
 283             &image_optional_header,
 284             IMAGE_SIZEOF_NT_OPTIONAL_HEADER);
 285
 286   CloseHandle (hImage);
 287
 288   switch (image_optional_header.Subsystem)
 289     {
 290     case IMAGE_SUBSYSTEM_UNKNOWN:
 291         return 1;
 292         break;
 293
 294     case IMAGE_SUBSYSTEM_NATIVE:
 295         return 1;
 296         break;
 297
 298     case IMAGE_SUBSYSTEM_WINDOWS_GUI:
 299         return 1;
 300         break;
 301
 302     case IMAGE_SUBSYSTEM_WINDOWS_CUI:
 303         return 0;
 304         break;
 305
 306     case IMAGE_SUBSYSTEM_OS2_CUI:
 307         return 0;
 308         break;
 309
 310     case IMAGE_SUBSYSTEM_POSIX_CUI:
 311         return 0;
 312         break;
 313
 314     default:
 315         /* Unknown, return GUI app to be preservative: if yes, it will be
 316            correctly launched, if no, it will be launched, and a console will
 317            be also displayed, which is not a big deal */
 318         return 1;
 319         break;
 320     }
 321
 322 }
 323
 324 static DWORD
 325 AbsoluteSeek (HANDLE hFile, DWORD offset)
 326 {
 327     DWORD newOffset;
 328
 329     newOffset = SetFilePointer (hFile, offset, NULL, FILE_BEGIN);
 330
 331     if (newOffset == 0xFFFFFFFF)
 332       return -1;
 333     else
 334       return newOffset;
 335 }
 336
 337 static VOID
 338 ReadBytes (HANDLE hFile, LPVOID buffer, DWORD size)
 339 {
 340   DWORD bytes;
 341
 342   if (!ReadFile(hFile, buffer, size, &bytes, NULL))
 343     {
 344       size = 0;
 345       return;
 346     }
 347   else if (size != bytes)
 348     {
 349       return;
 350     }
 351 }
 352
 353 static int
 354 nt_spawnve (char *exe, char **argv, char *env, struct TTY_Process *process)
 355 {
 356   STARTUPINFO start;
 357   SECURITY_ATTRIBUTES sec_attrs;
 358   SECURITY_DESCRIPTOR sec_desc;
 359   DWORD flags;
 360   char dir[ MAXPATHLEN ];
 361   int pid;
 362   int is_gui, use_cmd;
 363   char *cmdline, *parg, **targ;
 364   int do_quoting = 0;
 365   char escape_char;
 366   int arglen;
 367
 368   /* we have to do some conjuring here to put argv and envp into the
 369      form CreateProcess wants...  argv needs to be a space separated/null
 370      terminated list of parameters, and envp is a null
 371      separated/double-null terminated list of parameters.
 372
 373      Additionally, zero-length args and args containing whitespace or
 374      quote chars need to be wrapped in double quotes - for this to work,
 375      embedded quotes need to be escaped as well.  The aim is to ensure
 376      the child process reconstructs the argv array we start with
 377      exactly, so we treat quotes at the beginning and end of arguments
 378      as embedded quotes.
 379
 380      Note that using backslash to escape embedded quotes requires
 381      additional special handling if an embedded quote is already
 382      preceded by backslash, or if an arg requiring quoting ends with
 383      backslash.  In such cases, the run of escape characters needs to be
 384      doubled.  For consistency, we apply this special handling as long
 385      as the escape character is not quote.
 386
 387      Since we have no idea how large argv and envp are likely to be we
 388      figure out list lengths on the fly and allocate them.  */
 389
 390   if (!NILP (Vw32_quote_process_args))
 391     {
 392       do_quoting = 1;
 393       /* Override escape char by binding w32-quote-process-args to
 394          desired character, or use t for auto-selection.  */
 395       if (INTEGERP (Vw32_quote_process_args))
 396         escape_char = XINT (Vw32_quote_process_args);
 397       else
 398         escape_char = '\\';
 399     }
 400
 401   /* do argv...  */
 402   arglen = 0;
 403   targ = argv;
 404   while (*targ)
 405     {
 406       char *p = *targ;
 407       int need_quotes = 0;
 408       int escape_char_run = 0;
 409
 410       if (*p == 0)
 411         need_quotes = 1;
 412       for ( ; *p; p++)
 413         {
 414           if (*p == '"')
 415             {
 416               /* allow for embedded quotes to be escaped */
 417               arglen++;
 418               need_quotes = 1;
 419               /* handle the case where the embedded quote is already escaped */
 420               if (escape_char_run > 0)
 421                 {
 422                   /* To preserve the arg exactly, we need to double the
 423                      preceding escape characters (plus adding one to
 424                      escape the quote character itself).  */
 425                   arglen += escape_char_run;
 426                 }
 427             }
 428           else if (*p == ' ' || *p == '\t')
 429             {
 430               need_quotes = 1;
 431             }
 432
 433           if (*p == escape_char && escape_char != '"')
 434             escape_char_run++;
 435           else
 436             escape_char_run = 0;
 437         }
 438       if (need_quotes)
 439         {
 440           arglen += 2;
 441           /* handle the case where the arg ends with an escape char - we
 442              must not let the enclosing quote be escaped.  */
 443           if (escape_char_run > 0)
 444             arglen += escape_char_run;
 445         }
 446       arglen += strlen (*targ) + 1;
 447       targ++;
 448     }
 449
 450   is_gui = is_gui_app (argv[0]);
 451   use_cmd = FALSE;
 452
 453   if (is_gui == -1) {
 454     /* could not determine application type. Try launching with "cmd /c" */
 455     is_gui = FALSE;
 456     arglen += 7;
 457     use_cmd = TRUE;
 458   }
 459
 460   cmdline = (char*)malloc (arglen + 1);
 461   targ = argv;
 462   parg = cmdline;
 463
 464   if (use_cmd == TRUE) {
 465     strcpy (parg, "cmd /c ");
 466     parg += 7;
 467   }
 468
 469   while (*targ)
 470     {
 471       char * p = *targ;
 472       int need_quotes = 0;
 473
 474       if (*p == 0)
 475         need_quotes = 1;
 476
 477       if (do_quoting)
 478         {
 479           for ( ; *p; p++)
 480             if (*p == ' ' || *p == '\t' || *p == '"')
 481               need_quotes = 1;
 482         }
 483       if (need_quotes)
 484         {
 485           int escape_char_run = 0;
 486           char * first;
 487           char * last;
 488
 489           p = *targ;
 490           first = p;
 491           last = p + strlen (p) - 1;
 492           *parg++ = '"';
 493           for ( ; *p; p++)
 494             {
 495               if (*p == '"')
 496                 {
 497                   /* double preceding escape chars if any */
 498                   while (escape_char_run > 0)
 499                     {
 500                       *parg++ = escape_char;
 501                       escape_char_run--;
 502                     }
 503                   /* escape all quote chars, even at beginning or end */
 504                   *parg++ = escape_char;
 505                 }
 506               *parg++ = *p;
 507
 508               if (*p == escape_char && escape_char != '"')
 509                 escape_char_run++;
 510               else
 511                 escape_char_run = 0;
 512             }
 513           /* double escape chars before enclosing quote */
 514           while (escape_char_run > 0)
 515             {
 516               *parg++ = escape_char;
 517               escape_char_run--;
 518             }
 519           *parg++ = '"';
 520         }
 521       else
 522         {
 523           strcpy (parg, *targ);
 524           parg += strlen (*targ);
 525         }
 526       *parg++ = ' ';
 527       targ++;
 528     }
 529   *--parg = '\0';
 530
 531   memset (&start, 0, sizeof (start));
 532   start.cb = sizeof (start);
 533
 534   if (process->usePipe == TRUE) {
 535     start.dwFlags = STARTF_USESTDHANDLES;
 536     start.hStdInput = process->w_forkin;
 537     start.hStdOutput = process->w_forkout;
 538     /* child's stderr is always redirected to outfd */
 539     start.hStdError = process->w_forkout;
 540   } else {
 541     start.dwFlags = STARTF_USESTDHANDLES;
 542     /* We only need to redirect stderr/stdout here. Stdin will be forced to
 543        the spawned process console by explaunch */
 544     start.hStdInput = NULL;
 545     start.hStdOutput = process->w_forkout;
 546     start.hStdError = process->w_forkout;
 547   }
 548
 549   /* Explicitly specify no security */
 550   if (!InitializeSecurityDescriptor (&sec_desc, SECURITY_DESCRIPTOR_REVISION))
 551     goto EH_Fail;
 552   if (!SetSecurityDescriptorDacl (&sec_desc, TRUE, NULL, FALSE))
 553     goto EH_Fail;
 554   sec_attrs.nLength = sizeof (sec_attrs);
 555   sec_attrs.lpSecurityDescriptor = &sec_desc;
 556   sec_attrs.bInheritHandle = FALSE;
 557
 558   /* creating a new console allow easier close. Do not use
 559      CREATE_NEW_PROCESS_GROUP as this results in disabling Ctrl+C */
 560   flags = CREATE_NEW_CONSOLE;
 561   if (NILP (Vw32_start_process_inherit_error_mode))
 562     flags |= CREATE_DEFAULT_ERROR_MODE;
 563
 564   /* if app is not a gui application, hide the console */
 565   if (is_gui == FALSE) {
 566     start.dwFlags |= STARTF_USESHOWWINDOW;
 567     start.wShowWindow = SW_HIDE;
 568   }
 569
 570   /* Set initial directory to null character to use current directory */
 571   if (!CreateProcess (NULL, cmdline, &sec_attrs, NULL, TRUE,
 572                       flags, env, NULL, &start, &process->procinfo))
 573     goto EH_Fail;
 574
 575   pid = (int) process->procinfo.hProcess;
 576   process->pid=pid;
 577
 578   return pid;
 579
 580  EH_Fail:
 581   return -1;
 582 }
 583
 584 /*************************
 585  ** __gnat_send_header ()
 586  *************************/
 587
 588 #define EXP_SLAVE_CREATE 'c'
 589 #define EXP_SLAVE_KEY    'k'
 590 #define EXP_SLAVE_MOUSE  'm'
 591 #define EXP_SLAVE_WRITE  'w'
 592 #define EXP_SLAVE_KILL   'x'
 593
 594 #define EXP_KILL_TERMINATE  0x1
 595 #define EXP_KILL_CTRL_C     0x2
 596 #define EXP_KILL_CTRL_BREAK 0x4
 597
 598 void
 599 __gnat_send_header (struct TTY_Process* p, char header[5], int size, int *ret)
 600 {
 601   if (p->usePipe == FALSE) {
 602     header[0] = EXP_SLAVE_WRITE;
 603     header[1] = size & 0xff;
 604     header[2] = (size & 0xff00) >> 8;
 605     header[3] = (size & 0xff0000) >> 16;
 606     header[4] = (size & 0xff000000) >> 24;
 607     *ret = 1;
 608   } else {
 609     *ret = 0;
 610   }
 611 }
 612
 613 /**********************************
 614  **  __gnat_setup_communication ()
 615  **********************************/
 616
 617 int
 618 __gnat_setup_communication (struct TTY_Process** process_out) /* output param */
 619 {
 620   struct TTY_Process* process;
 621
 622   process = (struct TTY_Process*)malloc (sizeof (struct TTY_Process));
 623   ZeroMemory (process, sizeof (struct TTY_Process));
 624   *process_out = process;
 625
 626   return 0;
 627 }
 628
 629 #define EXP_PIPE_BASENAME "\\\\.\\pipe\\ExpectPipe"
 630
 631 int
 632 __gnat_setup_child_communication
 633   (struct TTY_Process* process,
 634    char** argv,
 635    int Use_Pipes)
 636 {
 637   int cpid;
 638   HANDLE parent;
 639   SECURITY_ATTRIBUTES sec_attrs;
 640   char slavePath [MAX_PATH];
 641   char **nargv;
 642   int argc;
 643   int i;
 644   char pipeNameIn[100];
 645   HANDLE hSlaveInDrv = NULL; /* Handle to communicate with slave driver */
 646
 647   parent = GetCurrentProcess ();
 648
 649   /* Set inheritance for the pipe handles */
 650   sec_attrs.nLength = sizeof (SECURITY_ATTRIBUTES);
 651   sec_attrs.bInheritHandle = TRUE;
 652   sec_attrs.lpSecurityDescriptor = NULL;
 653
 654   if (Use_Pipes) {
 655     /* Create in and out pipes */
 656     if (!CreatePipe (&process->w_forkin, &process->w_infd, &sec_attrs, 0))
 657       report_file_error ("Creation of child's IN handle", Qnil);
 658     if (!CreatePipe (&process->w_outfd, &process->w_forkout, &sec_attrs, 0))
 659       report_file_error ("Creation of child's OUT handle", Qnil);
 660
 661     /* Do not inherit the parent's side of the pipes */
 662     SetHandleInformation (&process->w_infd, HANDLE_FLAG_INHERIT, 0);
 663     SetHandleInformation (&process->w_outfd, HANDLE_FLAG_INHERIT, 0);
 664
 665     /* use native argv */
 666     nargv = argv;
 667     process->usePipe = TRUE;
 668
 669   } else {
 670     static int pipeNameId = 0;
 671
 672     process->w_infd = NULL;
 673
 674     /* We create a named pipe for Input, as we handle input by sending special
 675        commands to the explaunch process, that uses it to feed the actual input
 676        of the process */
 677     sprintf(pipeNameIn, "%sIn%08x_%08x", EXP_PIPE_BASENAME,
 678             GetCurrentProcessId(), pipeNameId);
 679     pipeNameId++;
 680
 681     hSlaveInDrv = CreateNamedPipe(pipeNameIn,
 682                                   PIPE_ACCESS_OUTBOUND,
 683                                   PIPE_TYPE_BYTE | PIPE_WAIT, 1, 8192, 8192,
 684                                   20000, NULL);
 685     if (hSlaveInDrv == NULL)  goto end;
 686
 687     if (!CreatePipe (&process->w_outfd, &process->w_forkout, &sec_attrs, 0))
 688       report_file_error ("Creation of child's OUT handle", Qnil);
 689
 690     if (SearchPath (NULL, "explaunch.exe", NULL,
 691                     MAX_PATH, slavePath, NULL) == 0) goto end;
 692
 693     for (argc=0; argv[argc] != NULL; argc++) ;
 694     nargv = (char **) malloc (sizeof (char*) * (argc + 3));
 695     nargv[0] = slavePath;
 696     nargv[1] = pipeNameIn;
 697
 698     for (i = 0; i <= argc; i++) nargv[i + 2] = argv[i];
 699     process->usePipe = FALSE;
 700   }
 701
 702   /* Spawn the child. */
 703   cpid = nt_spawnve (nargv[0], nargv, NULL, process);
 704
 705   /* close the duplicated handles passed to the child */
 706   CloseHandle (process->w_forkout);
 707
 708   if (process->usePipe == TRUE) {
 709     CloseHandle (process->w_forkin);
 710
 711   } else {
 712     UCHAR buf[8];               /* enough space for child status info */
 713     DWORD count;
 714     BOOL bRet;
 715     DWORD dwRet;
 716
 717     /*
 718      * Wait for connection with the slave driver
 719      */
 720     bRet = ConnectNamedPipe(hSlaveInDrv, NULL);
 721     if (bRet == FALSE) {
 722       dwRet = GetLastError();
 723       if (dwRet == ERROR_PIPE_CONNECTED) {
 724         ;
 725       } else {
 726         goto end;
 727       }
 728     }
 729
 730     process->w_infd = hSlaveInDrv;
 731
 732     /*
 733      * wait for slave driver to initialize before allowing user to send to it
 734      */
 735     bRet = ReadFile(process->w_outfd, buf, 8, &count, NULL);
 736     if (bRet == FALSE) {
 737       cpid = -1;
 738     }
 739
 740     dwRet = buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
 741     if (dwRet != 0) {
 742       cpid = -1;
 743     }
 744
 745     cpid = buf[4] | (buf[5] << 8) | (buf[6] << 16) | (buf[7] << 24);
 746     process->pid = cpid;
 747   }
 748
 749   if (cpid == -1)
 750     /* An error occurred while trying to spawn the process.  */
 751     report_file_error ("Spawning child process", Qnil);
 752
 753   return cpid;
 754  end:
 755   if (hSlaveInDrv != NULL)
 756     CloseHandle (hSlaveInDrv);
 757   return -1;
 758 }
 759
 760 void
 761 __gnat_setup_parent_communication
 762   (struct TTY_Process* process,
 763    int* in,
 764    int* out,
 765    int* err,
 766    int* pid)
 767 {
 768   *in = _open_osfhandle ((long) process->w_infd, 0);
 769   *out = _open_osfhandle ((long) process->w_outfd, 0);
 770   /* child's stderr is always redirected to outfd */
 771   *err = *out;
 772   *pid = process->pid;
 773 }
 774
 775 typedef struct _child_process
 776 {
 777   HWND                 hwnd;
 778   PROCESS_INFORMATION *procinfo;
 779 } child_process;
 780
 781 /* The major and minor versions of NT.  */
 782 static int w32_major_version;
 783 static int w32_minor_version;
 784
 785 /* Distinguish between Windows NT and Windows 95.  */
 786 static enum {OS_UNKNOWN, OS_WIN95, OS_NT} os_subtype = OS_UNKNOWN;
 787
 788 /* Cache information describing the NT system for later use.  */
 789 static void
 790 cache_system_info (void)
 791 {
 792   union
 793     {
 794       struct info
 795         {
 796           char  major;
 797           char  minor;
 798           short platform;
 799         } info;
 800       DWORD data;
 801     } version;
 802
 803   /* Cache the version of the operating system.  */
 804   version.data = GetVersion ();
 805   w32_major_version = version.info.major;
 806   w32_minor_version = version.info.minor;
 807
 808   if (version.info.platform & 0x8000)
 809     os_subtype = OS_WIN95;
 810   else
 811     os_subtype = OS_NT;
 812 }
 813
 814 static BOOL CALLBACK
 815 find_child_console (HWND hwnd, child_process * cp)
 816 {
 817   DWORD thread_id;
 818   DWORD process_id;
 819
 820   thread_id = GetWindowThreadProcessId (hwnd, &process_id);
 821   if (process_id == cp->procinfo->dwProcessId)
 822     {
 823       char window_class[32];
 824
 825       GetClassName (hwnd, window_class, sizeof (window_class));
 826       if (strcmp (window_class,
 827                   (os_subtype == OS_WIN95)
 828                   ? "tty"
 829                   : "ConsoleWindowClass") == 0)
 830         {
 831           cp->hwnd = hwnd;
 832           return FALSE;
 833         }
 834     }
 835   /* keep looking */
 836   return TRUE;
 837 }
 838
 839 int
 840 __gnat_interrupt_process (struct TTY_Process* p)
 841 {
 842   char buf[2];
 843   DWORD written;
 844   BOOL bret;
 845
 846   if (p->usePipe == TRUE) {
 847     bret = FALSE;
 848   } else {
 849     buf[0] = EXP_SLAVE_KILL;
 850     buf[1] = EXP_KILL_CTRL_C;
 851     bret = WriteFile (p->w_infd, buf, 2, &written, NULL);
 852   }
 853
 854   if (bret == FALSE) {
 855     return __gnat_interrupt_pid (p->procinfo.dwProcessId);
 856   }
 857   return 0;
 858 }
 859
 860 int
 861 __gnat_interrupt_pid (int pid)
 862 {
 863   volatile child_process cp;
 864   int rc = 0;
 865
 866   cp.procinfo = (LPPROCESS_INFORMATION) malloc (sizeof (PROCESS_INFORMATION));
 867   cp.procinfo->dwProcessId = pid;
 868
 869   if (os_subtype == OS_UNKNOWN)
 870     cache_system_info ();
 871
 872   /* Try to locate console window for process. */
 873   EnumWindows ((WNDENUMPROC) find_child_console, (LPARAM) &cp);
 874
 875   if (cp.hwnd)
 876     {
 877       BYTE control_scan_code = (BYTE) MapVirtualKey (VK_CONTROL, 0);
 878       /* Retrieve Ctrl-C scancode */
 879       BYTE vk_break_code = 'C';
 880       BYTE break_scan_code = (BYTE) MapVirtualKey (vk_break_code, 0);
 881       HWND foreground_window;
 882
 883       foreground_window = GetForegroundWindow ();
 884       if (foreground_window)
 885         {
 886           /* NT 5.0, and apparently also Windows 98, will not allow
 887              a Window to be set to foreground directly without the
 888              user's involvement. The workaround is to attach
 889              ourselves to the thread that owns the foreground
 890              window, since that is the only thread that can set the
 891              foreground window.  */
 892           DWORD foreground_thread, child_thread;
 893
 894           foreground_thread =
 895             GetWindowThreadProcessId (foreground_window, NULL);
 896           if (foreground_thread == GetCurrentThreadId ()
 897               || !AttachThreadInput (GetCurrentThreadId (),
 898                                      foreground_thread, TRUE))
 899             foreground_thread = 0;
 900
 901           child_thread = GetWindowThreadProcessId (cp.hwnd, NULL);
 902           if (child_thread == GetCurrentThreadId ()
 903               || !AttachThreadInput (GetCurrentThreadId (),
 904                                      child_thread, TRUE))
 905             child_thread = 0;
 906
 907           /* Set the foreground window to the child.  */
 908           if (SetForegroundWindow (cp.hwnd))
 909             {
 910               /* Generate keystrokes as if user had typed Ctrl-Break or
 911                  Ctrl-C.  */
 912               keybd_event (VK_CONTROL, control_scan_code, 0, 0);
 913               keybd_event (vk_break_code, break_scan_code,
 914                 (vk_break_code == 'C' ? 0 : KEYEVENTF_EXTENDEDKEY), 0);
 915               keybd_event (vk_break_code, break_scan_code,
 916                 (vk_break_code == 'C' ? 0 : KEYEVENTF_EXTENDEDKEY)
 917                  | KEYEVENTF_KEYUP, 0);
 918               keybd_event (VK_CONTROL, control_scan_code, KEYEVENTF_KEYUP, 0);
 919
 920               /* Sleep for a bit to give time for the main frame to respond
 921               to focus change events.  */
 922               Sleep (100);
 923
 924               SetForegroundWindow (foreground_window);
 925             }
 926           /* Detach from the foreground and child threads now that
 927              the foreground switching is over.  */
 928           if (foreground_thread)
 929             AttachThreadInput (GetCurrentThreadId (), foreground_thread, FALSE);
 930           if (child_thread)
 931             AttachThreadInput (GetCurrentThreadId (), child_thread, FALSE);
 932         }
 933     }
 934   /* Ctrl-Break is NT equivalent of SIGINT.  */
 935   else if (!GenerateConsoleCtrlEvent
 936              (CTRL_BREAK_EVENT, cp.procinfo->dwProcessId))
 937     {
 938       errno = EINVAL;
 939       rc = -1;
 940     }
 941
 942   free (cp.procinfo);
 943   return rc;
 944 }
 945
 946 /* kill a process, as this implementation use CreateProcess on Win32 we need
 947    to use Win32 TerminateProcess API */
 948 int
 949 __gnat_terminate_process (struct TTY_Process* p)
 950 {
 951   char buf[2];
 952   DWORD written;
 953   BOOL bret;
 954
 955   if (p->usePipe == TRUE) {
 956     bret = FALSE;
 957   } else {
 958     buf[0] = EXP_SLAVE_KILL;
 959     buf[1] = EXP_KILL_TERMINATE;
 960     bret = WriteFile (p->w_infd, buf, 2, &written, NULL);
 961   }
 962
 963   if (bret == FALSE) {
 964     if (!TerminateProcess (p->procinfo.hProcess, 1))
 965       return -1;
 966     else
 967       return 0;
 968   } else
 969     return 0;
 970 }
 971
 972 /* wait for process pid to terminate and return the process status. This
 973    implementation is different from the adaint.c one for Windows as it uses
 974    the Win32 API instead of the C one. */
 975
 976 int
 977 __gnat_tty_waitpid (struct TTY_Process* p)
 978 {
 979   DWORD exitcode;
 980   DWORD res;
 981   HANDLE proc_hand = p->procinfo.hProcess;
 982
 983   res = WaitForSingleObject (proc_hand, 0);
 984   GetExitCodeProcess (proc_hand, &exitcode);
 985
 986   CloseHandle (p->procinfo.hThread);
 987   CloseHandle (p->procinfo.hProcess);
 988
 989   /* No need to close the handles: they were closed on the ada side */
 990
 991   return (int) exitcode;
 992 }
 993
 994 /********************************
 995  **  __gnat_free_process ()
 996  ********************************/
 997
 998 void
 999 __gnat_free_process (struct TTY_Process** process)
1000 {
1001   free (*process);
1002   *process = NULL;
1003 }
1004
1005 /* TTY handling */
1006
1007 typedef struct {
1008   int tty_fd;        /* descriptor for the tty */
1009   char tty_name[24]; /* Name of TTY device */
1010 } TTY_Handle;
1011
1012 int
1013 __gnat_tty_supported (void)
1014 {
1015   return 0;
1016 }
1017
1018 /* Return the tty name associated with p */
1019
1020 char *
1021 __gnat_tty_name (TTY_Handle* t)
1022 {
1023   return t->tty_name;
1024 }
1025
1026 int
1027 __gnat_tty_fd (TTY_Handle* t)
1028 {
1029   return t->tty_fd;
1030 }
1031
1032 TTY_Handle*
1033 __gnat_new_tty (void)
1034 {
1035   return (TTY_Handle*)0;
1036 }
1037
1038 void
1039 __gnat_reset_tty (TTY_Handle* t)
1040 {
1041   return;
1042 }
1043
1044 void
1045 __gnat_close_tty (TTY_Handle* t)
1046 {
1047   free (t);
1048 }
1049
1050 void
1051 __gnat_setup_winsize (void *desc, int rows, int columns)
1052 {
1053 }
1054
1055 #else /* defined(_WIN32, implementatin for all UNIXes */
1056
1057 /* First defined some macro to identify easily some systems */
1058 #if defined (__FreeBSD__) \
1059  || defined (__OpenBSD__) \
1060  || defined (__NetBSD__)  \
1061  || defined (__DragonFly__)
1062 #   define BSD
1063 #endif
1064
1065 /* Include every system header we need */
1066 #define _GNU_SOURCE
1067 #include <errno.h>
1068 #include <stdio.h>
1069 #include <stdlib.h>
1070
1071 /* On some system termio is either absent or including it will disable termios
1072    (HP-UX) */
1073 #if !defined (__hpux__) && !defined (BSD) && !defined (__APPLE__) \
1074   && !defined (__rtems__)
1075 #   include <termio.h>
1076 #endif
1077
1078 #include <sys/ioctl.h>
1079 #include <termios.h>
1080 #include <fcntl.h>
1081 #include <string.h>
1082 #include <sys/stat.h>
1083 #include <sys/types.h>
1084 #include <sys/wait.h>
1085 #include <unistd.h>
1086 #if defined (__sun__)
1087 #   include <sys/stropts.h>
1088 #endif
1089 #if defined (BSD) || defined (__sun__)
1090 #   include <sys/signal.h>
1091 #endif
1092 #if defined (__hpux__)
1093 #   include <sys/termio.h>
1094 #   include <sys/stropts.h>
1095 #endif
1096
1097 #define CDISABLE _POSIX_VDISABLE
1098
1099 /* On HP-UX and Sun system, there is a bzero function but with a different
1100    signature. Use memset instead */
1101 #if defined (__hpux__) || defined (__sun__) || defined (_AIX)
1102 #   define bzero(s,n) memset (s,0,n)
1103 #endif
1104
1105 /* POSIX does not specify how to open the master side of a terminal.Several
1106    methods are available (system specific):
1107       1- using a cloning device (USE_CLONE_DEVICE)
1108       2- getpt                  (USE_GETPT)
1109       3- openpty                (USE_OPENPTY)
1110
1111    When using the cloning device method, the macro USE_CLONE_DEVICE should
1112    contains a full path to the adequate device.
1113
1114    When a new system is about to be supported, one of the previous macro should
1115    be set otherwise allocate_pty_desc will return an error
1116 */
1117
1118 /* Configurable part */
1119 #if defined (__APPLE__) || defined (BSD)
1120 #define USE_OPENPTY
1121 #elif defined (__linux__)
1122 #define USE_GETPT
1123 #elif defined (__sun__)
1124 #define USE_CLONE_DEVICE "/dev/ptmx"
1125 #elif defined (_AIX)
1126 #define USE_CLONE_DEVICE "/dev/ptc"
1127 #elif defined (__hpux__)
1128 /* On HP-UX we use the streamed version. Using the non streamed version is not
1129    recommanded (through "/dev/ptym/clone"). Indeed it seems that there are
1130    issues to detect process terminations. */
1131 #define USE_CLONE_DEVICE "/dev/ptmx"
1132 #endif
1133
1134 /* structure that holds information about the terminal used and the process
1135    connected on the slave side */
1136 typedef struct pty_desc_struct {
1137    int  master_fd;     /* fd of the master side if the terminal */
1138    int  slave_fd;      /* fd of the slave side */
1139    char slave_name[32];   /* filename of the slave side */
1140    int  child_pid;     /* PID of the child process connected to the slave side
1141                          of the terminal */
1142 } pty_desc;
1143
1144 /* allocate_pty_desc - allocate a pseudo terminal
1145  *
1146  * PARAMETERS
1147  *   out desc  returned pointer to a pty_desc structure containing information
1148  *             about the opened pseudo terminal
1149  * RETURN VALUE
1150  *   -1        if failed
1151  *    0        if ok
1152  * COMMENTS
1153  *   If the function is successful we should have at least the master side fd
1154  *   and the slave side filename. On some system, the slave side will also be
1155  *   opened. If this is not the case the slave side will be open once we are in
1156  *   the child process (note that opening the slave side at this stage will
1157  *   failed...).
1158  */
1159
1160 extern char* ptsname (int);
1161
1162 static int
1163 allocate_pty_desc (pty_desc **desc) {
1164
1165    pty_desc *result;
1166    int  status      =  0;
1167    int  slave_fd    = -1;
1168    int  master_fd   = -1;
1169    char *slave_name = NULL;
1170
1171 #ifdef USE_GETPT
1172   master_fd = getpt ();
1173 #elif defined (USE_OPENPTY)
1174   status = openpty (&master_fd, &slave_fd, NULL, NULL, NULL);
1175 #elif defined (USE_CLONE_DEVICE)
1176   master_fd = open (USE_CLONE_DEVICE, O_RDWR | O_NONBLOCK, 0);
1177 #else
1178   printf ("[error]: terminal support is not configured\n");
1179   return -1;
1180 #endif
1181
1182   /* at this stage we should have the master side fd and status should be 0 */
1183   if (status != 0 || master_fd < 0)
1184     {
1185       /* If this is not the case close all opened files and return -1 */
1186       printf ("[error]: cannot allocate master side of the pty\n");
1187       if (master_fd >= 0) close (master_fd);
1188       if (slave_fd  >= 0) close (slave_fd);
1189       *desc = NULL;
1190       return -1;
1191     }
1192
1193   /* retrieve the file name of the slave side if necessary */
1194   if (slave_name == NULL) slave_name = (char *) ptsname (master_fd);
1195
1196   /* Now we should have slave file name */
1197   if (slave_name == NULL)
1198     {
1199       /* If not the case close any opened file and return - 1 */
1200       printf ("[error]: cannot allocate slave side of the pty\n");
1201       if (master_fd >= 0) close (master_fd);
1202       if (slave_fd  >= 0) close (slave_fd);
1203       *desc = NULL;
1204       return -1;
1205     }
1206
1207 #if !defined(__rtems__)
1208   /* grant access to the slave side */
1209   grantpt (master_fd);
1210   /* unlock the terminal */
1211   unlockpt (master_fd);
1212 #endif
1213
1214   /* set desc and return 0 */
1215   result = malloc (sizeof (pty_desc));
1216   result->master_fd  = master_fd;
1217   result->slave_fd   = slave_fd;
1218   /* the string returned by ptsname or _getpty is a static allocated string. So
1219      we should make a copy */
1220   strncpy (result->slave_name, slave_name, sizeof (result->slave_name));
1221   result->slave_name[sizeof (result->slave_name) - 1] = '\0';
1222   result->child_pid  = -1;
1223   *desc=result;
1224   return 0;
1225 }
1226
1227 /* some utility macro that make the code of child_setup_tty easier to read */
1228 #define __enable(a, b) ((a) |= (b))
1229 #define __disable(a, b) ((a) &= ~(b))
1230
1231 /* some properties do not exist on all systems. Set their value to 0 in that
1232    case */
1233 #ifndef IUCLC
1234 #define IUCLC 0
1235 #endif
1236 #ifndef OLCUC
1237 #define OLCUC 0
1238 #endif
1239 #ifndef NLDLY
1240 #define NLDLY 0
1241 #define CRDLY 0
1242 #define TABDLY 0
1243 #define BSDLY 0
1244 #define VTDLY 0
1245 #define FFDLY 0
1246 #endif
1247
1248 /* child_setup_tty - set terminal properties
1249  *
1250  * PARAMETERS
1251  *   file descriptor of the slave side of the terminal
1252  *
1253  * RETURN VALUE
1254  *   0 if success, any other value if failed.
1255  *
1256  * COMMENTS
1257  *   None
1258  */
1259 static int
1260 child_setup_tty (int fd)
1261 {
1262   struct termios s;
1263   int    status;
1264
1265   /* ensure that s is filled with 0 */
1266   bzero (&s, sizeof (s));
1267
1268   /* Get the current terminal settings */
1269   status = tcgetattr (fd, &s);
1270   if (status != 0) return -1;
1271
1272   /* Adjust input modes */
1273   __disable (s.c_iflag, IUCLC);    /* don't transform to lower case */
1274   __disable (s.c_iflag, ISTRIP);   /* don't delete 8th bit */
1275
1276   /* Adjust output modes */
1277   __enable  (s.c_oflag, OPOST);    /* enable postprocessing */
1278   __disable (s.c_oflag, ONLCR);    /* don't map LF to CR-LF */
1279   __disable (s.c_oflag, NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
1280                                    /* disable delays */
1281   __disable (s.c_oflag, OLCUC);    /* don't transform to upper case */
1282
1283   /* Adjust control modes */
1284   s.c_cflag = (s.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
1285
1286   /* Adjust local modes */
1287   __disable (s.c_lflag, ECHO);     /* disable echo */
1288   __enable  (s.c_lflag, ISIG);     /* enable signals */
1289   __enable  (s.c_lflag, ICANON);   /* erase/kill/eof processing */
1290
1291   /* Adjust control characters */
1292   /* IMPORTANT: we need to ensure that Ctrl-C will trigger an interrupt signal
1293      otherwise send_signal_via_characters will fail */
1294   s.c_cc[VEOF]   = 04;         /* insure that EOF is Control-D */
1295   s.c_cc[VERASE] = CDISABLE;   /* disable erase processing */
1296   s.c_cc[VKILL]  = CDISABLE;   /* disable kill processing */
1297   s.c_cc[VQUIT]  = 28;         /* Control-\ */
1298   s.c_cc[VINTR]  = 03;         /* Control-C */
1299   s.c_cc[VEOL]   = CDISABLE;
1300   s.c_cc[VSUSP]  = 26;         /* Control-Z */
1301
1302   /* push our changes */
1303   status = tcsetattr (fd, TCSADRAIN, &s);
1304   return status;
1305 }
1306
1307 /* __gnat_setup_communication - interface to the external world. Should be
1308  * called before forking. On Unixes this function only call allocate_pty_desc.
1309  * The Windows implementation (in different part of this file) is very
1310  * different.
1311  *
1312  * PARAMETERS
1313  *  out desc   returned pointer to a pty_desc structure
1314  * RETURN VALUE
1315  *  0 if success, -1 otherwise
1316  */
1317 int __gnat_setup_communication (pty_desc** desc) {
1318   return allocate_pty_desc (desc);
1319 }
1320
1321 /* __gnat_setup_parent_communication - interface to the external world. Should
1322  * be called after forking in the parent process
1323  *
1324  * PARAMETERS
1325  *   out in_fd
1326      out out_fd
1327      out err_fd fds corresponding to the parent side of the
1328                 terminal
1329      in pid_out child process pid
1330  * RETRUN VALUE
1331  *  0
1332  */
1333 void
1334 __gnat_setup_parent_communication
1335   (pty_desc *desc,
1336    int*     in_fd,  /* input */
1337    int*     out_fd, /* output */
1338    int*     err_fd, /* error */
1339    int*     pid_out)
1340 {
1341
1342   *in_fd = desc->master_fd;
1343   *out_fd= desc->master_fd;
1344   *err_fd= desc->master_fd;
1345   desc->child_pid = *pid_out;
1346 }
1347
1348 /* __gnat_setup_winsize - Sets up the size of the terminal
1349  * This lets the process know the size of the terminal
1350  */
1351
1352 void __gnat_setup_winsize (pty_desc *desc, int rows, int columns) {
1353 #ifdef TIOCGWINSZ
1354   struct winsize s;
1355   s.ws_row = (unsigned short)rows;
1356   s.ws_col = (unsigned short)columns;
1357   s.ws_xpixel = 0;
1358   s.ws_ypixel = 0;
1359   ioctl (desc->master_fd, TIOCSWINSZ, &s);
1360 #ifdef SIGWINCH
1361   if (desc->child_pid > 0) {
1362      /* Let the process know about the change in size */
1363      kill (desc->child_pid, SIGWINCH);
1364   }
1365 #endif
1366 #endif
1367 }
1368
1369 /* __gnat_setup_child_communication - interface to external world. Should be
1370  * called after forking in the child process. On Unixes, this function
1371  * first adjust the line setting, set standard output, input and error and
1372  * then spawn the program.
1373  *
1374  * PARAMETERS
1375  *   desc      a pty_desc structure containing the pty parameters
1376  *   new_argv  argv of the program to be spawned
1377  * RETURN VALUE
1378  *   this function should not return
1379  */
1380 int
1381 __gnat_setup_child_communication
1382    (pty_desc *desc,
1383     char **new_argv,
1384     int Use_Pipes)
1385 {
1386   int status;
1387   int pid = getpid ();
1388
1389   setsid ();
1390
1391   /* open the slave side of the terminal if necessary */
1392   if (desc->slave_fd == -1)
1393 #if defined (_AIX)
1394     /* On AIX, if the slave process is not opened with O_NDELAY or O_NONBLOCK
1395        then we might have some processes hanging on I/O system calls. Not sure
1396        we can do that for all platforms so do it only on AIX for the moment.
1397        On AIX O_NONBLOCK and O_NDELAY have slightly different meanings. When
1398        reading on the slave fd, in case there is no data available, if O_NDELAY
1399        is set then 0 is returned. If O_NON_BLOCK is -1 is returned. It seems
1400        that interactive programs such as GDB prefer the O_NDELAY behavior.
1401        We chose O_NONBLOCK because it allows us to make the distinction
1402        between a true EOF and an EOF returned because there is no data
1403        available to be read.  */
1404     desc->slave_fd = open (desc->slave_name, O_RDWR | O_NONBLOCK, 0);
1405 #else
1406     desc->slave_fd = open (desc->slave_name, O_RDWR, 0);
1407 #endif
1408
1409 #if defined (__sun__) || defined (__hpux__)
1410   /* On systems such as Solaris we are using stream. We need to push the right
1411      "modules" in order to get the expected terminal behaviors. Otherwise
1412      functionalities such as termios are not available.  */
1413   ioctl (desc->slave_fd, I_PUSH, "ptem");
1414   ioctl (desc->slave_fd, I_PUSH, "ldterm");
1415   ioctl (desc->slave_fd, I_PUSH, "ttcompat");
1416 #endif
1417
1418 #ifdef TIOCSCTTY
1419   /* make the tty the controlling terminal */
1420   status = ioctl (desc->slave_fd, TIOCSCTTY, 0);
1421 #endif
1422
1423   /* adjust tty settings */
1424   child_setup_tty (desc->slave_fd);
1425   __gnat_setup_winsize (desc, 24, 80); /* To prevent errors in some shells */
1426
1427   /* stdin, stdout and stderr should be now our tty */
1428   dup2 (desc->slave_fd, 0);
1429   dup2 (desc->slave_fd, 1);
1430   dup2 (desc->slave_fd, 2);
1431   if (desc->slave_fd > 2) close (desc->slave_fd);
1432
1433   /* adjust process group settings */
1434   status = setpgid (pid, pid);
1435   status = tcsetpgrp (0, pid);
1436
1437   /* launch the program */
1438   execvp (new_argv[0], new_argv);
1439
1440   /* return the pid */
1441   return pid;
1442 }
1443
1444 /* send_signal_via_characters - Send a characters that will trigger a signal
1445  * in the child process.
1446  *
1447  * PARAMETERS
1448  *  desc  a pty_desc structure containing terminal information
1449  *  int   a signal number
1450  * RETURN VALUE
1451  *  None
1452  */
1453 static void
1454 send_signal_via_characters
1455   (pty_desc *desc,
1456    int signal_number)
1457 {
1458   char ctrl_c         = 03;
1459   char ctrl_backslash = 28;
1460   char ctrl_Z         = 26;
1461
1462   switch (signal_number)
1463     {
1464       case SIGINT:
1465         write (desc->master_fd, &ctrl_c, 1); return;
1466       case SIGQUIT:
1467         write (desc->master_fd, &ctrl_backslash, 1); return;
1468       case SIGTSTP:
1469         write (desc->master_fd, &ctrl_Z, 1); return;
1470     }
1471 }
1472
1473 /* __gnat_interrupt_process - interrupt the child process
1474  *
1475  * PARAMETERS
1476  *   desc a pty_desc structure
1477  */
1478 int
1479 __gnat_interrupt_process (pty_desc *desc)
1480 {
1481   send_signal_via_characters (desc, SIGINT);
1482   return 0;
1483 }
1484
1485 /* __gnat_interrupt_pid - interrupt a process group
1486  *
1487  * PARAMETERS
1488  *   pid  pid of the process to interrupt
1489  */
1490 int
1491 __gnat_interrupt_pid (int pid)
1492 {
1493   kill (-pid, SIGINT);
1494   return 0;
1495 }
1496
1497 /* __gnat_terminate_process - kill a child process
1498  *
1499  * PARAMETERS
1500  *   desc pty_desc structure
1501  */
1502 int __gnat_terminate_process (pty_desc *desc)
1503 {
1504   return kill (desc->child_pid, SIGKILL);
1505 }
1506
1507 /* __gnat_tty_waitpid - wait for the child process to die
1508  *
1509  * PARAMETERS
1510  *   desc pty_desc structure
1511  * RETURN VALUE
1512  *   exit status of the child process
1513  */
1514 int
1515 __gnat_tty_waitpid (pty_desc *desc)
1516 {
1517   int status = 0;
1518   waitpid (desc->child_pid, &status, 0);
1519   return WEXITSTATUS (status);
1520 }
1521
1522 /* __gnat_tty_supported - Are tty supported ?
1523  *
1524  * RETURN VALUE
1525  *   always 1 on Unix systems
1526  */
1527 int
1528 __gnat_tty_supported (void)
1529 {
1530   return 1;
1531 }
1532
1533 /* __gnat_free_process - free a pty_desc structure
1534  *
1535  * PARAMETERS
1536  *   in out desc: a pty desc structure
1537  */
1538 void
1539 __gnat_free_process (pty_desc** desc)
1540 {
1541   free (*desc);
1542   *desc = NULL;
1543 }
1544
1545 /* __gnat_send_header - dummy function. this interface is only used on Windows */
1546 void
1547 __gnat_send_header (pty_desc* desc, char header[5], int size, int *ret)
1548 {
1549   *ret = 0;
1550 }
1551
1552 /* __gnat_reset_tty - reset line setting
1553  *
1554  * PARAMETERS
1555  *   desc: a pty_desc structure
1556  */
1557 void
1558 __gnat_reset_tty (pty_desc* desc)
1559 {
1560   child_setup_tty (desc->master_fd);
1561 }
1562
1563 /* __gnat_new_tty - allocate a new terminal
1564  *
1565  * RETURN VALUE
1566  *   a pty_desc structure
1567  */
1568 pty_desc *
1569 __gnat_new_tty (void)
1570 {
1571   int status;
1572   pty_desc* desc;
1573   status = allocate_pty_desc (&desc);
1574   child_setup_tty (desc->master_fd);
1575   return desc;
1576 }
1577
1578 /* __gnat_close_tty - close a terminal
1579  *
1580  * PARAMETERS
1581  *   desc  a pty_desc strucure
1582  */
1583 void __gnat_close_tty (pty_desc* desc)
1584 {
1585   if (desc->master_fd >= 0) close (desc->master_fd);
1586   if (desc->slave_fd  >= 0) close (desc->slave_fd);
1587 }
1588
1589 /* __gnat_tty_name - return slave side device name
1590  *
1591  * PARAMETERS
1592  *   desc  a pty_desc strucure
1593  * RETURN VALUE
1594  *   a string
1595  */
1596 char *
1597 __gnat_tty_name (pty_desc* desc)
1598 {
1599   return desc->slave_name;
1600 }
1601
1602 /* __gnat_tty_name - return master side fd
1603  *
1604  * PARAMETERS
1605  *   desc  a pty_desc strucure
1606  * RETURN VALUE
1607  *   a fd
1608  */
1609 int
1610 __gnat_tty_fd (pty_desc* desc)
1611 {
1612   return desc->master_fd;
1613 }
1614
1615 #endif /* WIN32 */