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) 2008-2012, 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
  36 void * __gnat_new_tty (void) { return (void*)0; }
  37 char * __gnat_tty_name (void* t) { return (char*)0; }
  38 int    __gnat_interrupt_pid (int pid) { return -1; }
  39 int    __gnat_interrupt_process (void* desc) { return -1; }
  40 int    __gnat_setup_communication (void** desc) { return -1; }
  41 void   __gnat_setup_parent_communication
  42          (void* d, int* i, int* o, int*e, int*p) { return -1; }
  43 int    __gnat_setup_child_communication
  44          (void* d, char **n, int u) { return -1; }
  45 int    __gnat_terminate_process (void *desc) { return -1; }
  46 int    __gnat_tty_fd (void* t) { return -1; }
  47 int    __gnat_tty_supported (void) { return 0; }
  48 int    __gnat_tty_waitpid (void *desc) { return 1; }
  49 void   __gnat_close_tty (void* t) {}
  50 void   __gnat_free_process (void** process) {}
  51 void   __gnat_reset_tty (void* t) {}
  52 void   __gnat_send_header (void* d, char h[5], int s, int *r) {}
  53 void   __gnat_setup_winsize (void *desc, int rows, int columns) {}
  54
  55 /* For Windows platforms. */
  56
  57 #elif defined(_WIN32)
  58
  59 #include <errno.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62
  63 #include <windows.h>
  64
  65 #define MAXPATHLEN 1024
  66
  67 #define NILP(x) ((x) == 0)
  68 #define Qnil 0
  69 #define report_file_error(x, y) fprintf (stderr, "Error: %s\n", x);
  70 #define INTEGERP(x) 1
  71 #define XINT(x) x
  72
  73 struct TTY_Process {
  74   int pid;           /* Number of this process */
  75   PROCESS_INFORMATION procinfo;
  76   HANDLE w_infd, w_outfd;
  77   HANDLE w_forkin, w_forkout;
  78   BOOL usePipe;
  79 };
  80
  81 /* Control whether create_child cause the process to inherit GPS'
  82    error mode setting.  The default is 1, to minimize the possibility of
  83    subprocesses blocking when accessing unmounted drives.  */
  84 static int Vw32_start_process_inherit_error_mode = 1;
  85
  86 /* Control whether spawnve quotes arguments as necessary to ensure
  87    correct parsing by child process.  Because not all uses of spawnve
  88    are careful about constructing argv arrays, we make this behaviour
  89    conditional (off by default, since a similar operation is already done
  90    in g-expect.adb by calling Normalize_Argument). */
  91 static int Vw32_quote_process_args = 0;
  92
  93 static DWORD AbsoluteSeek(HANDLE, DWORD);
  94 static VOID  ReadBytes(HANDLE, LPVOID, DWORD);
  95
  96 #define XFER_BUFFER_SIZE 2048
  97
  98 /* This tell if the executable we're about to launch uses a GUI interface. */
  99 /* if we can't determine it, we will return true */
 100 static int
 101 is_gui_app (char *exe)
 102 {
 103   HANDLE hImage;
 104
 105   DWORD  bytes;
 106   DWORD  iSection;
 107   DWORD  SectionOffset;
 108   DWORD  CoffHeaderOffset;
 109   DWORD  MoreDosHeader[16];
 110   CHAR   *file;
 111   size_t nlen;
 112
 113   ULONG  ntSignature;
 114
 115   IMAGE_DOS_HEADER      image_dos_header;
 116   IMAGE_FILE_HEADER     image_file_header;
 117   IMAGE_OPTIONAL_HEADER image_optional_header;
 118   IMAGE_SECTION_HEADER  image_section_header;
 119
 120   /*
 121    *  Open the reference file.
 122   */
 123   nlen = strlen (exe);
 124   file = exe;
 125   if (nlen > 2) {
 126     if (exe[0] == '"') {
 127       /* remove quotes */
 128       nlen -= 2;
 129       file = malloc ((nlen + 1) * sizeof (char));
 130       memcpy (file, &exe[1], nlen);
 131       file [nlen] = '\0';
 132     }
 133   }
 134   hImage = CreateFile(file,
 135                       GENERIC_READ,
 136                       FILE_SHARE_READ,
 137                       NULL,
 138                       OPEN_EXISTING,
 139                       FILE_ATTRIBUTE_NORMAL,
 140                       NULL);
 141
 142   if (file != exe) {
 143     free (file);
 144   }
 145
 146   if (INVALID_HANDLE_VALUE == hImage)
 147     {
 148       report_file_error ("Could not open exe: ", Qnil);
 149       report_file_error (exe, Qnil);
 150       report_file_error ("\n", Qnil);
 151       CloseHandle (hImage);
 152       return -1;
 153     }
 154
 155   /*
 156    *  Read the MS-DOS image header.
 157    */
 158   ReadBytes(hImage, &image_dos_header, sizeof(IMAGE_DOS_HEADER));
 159
 160   if (IMAGE_DOS_SIGNATURE != image_dos_header.e_magic)
 161     {
 162       report_file_error("Sorry, I do not understand this file.\n", Qnil);
 163       CloseHandle (hImage);
 164       return -1;
 165     }
 166
 167   /*
 168    *  Read more MS-DOS header.       */
 169   ReadBytes(hImage, MoreDosHeader, sizeof(MoreDosHeader));
 170    /*
 171    *  Get actual COFF header.
 172    */
 173   CoffHeaderOffset = AbsoluteSeek(hImage, image_dos_header.e_lfanew) +
 174                      sizeof(ULONG);
 175   if (CoffHeaderOffset < 0) {
 176     CloseHandle (hImage);
 177     return -1;
 178   }
 179
 180   ReadBytes (hImage, &ntSignature, sizeof(ULONG));
 181
 182   if (IMAGE_NT_SIGNATURE != ntSignature)
 183     {
 184       report_file_error ("Missing NT signature. Unknown file type.\n", Qnil);
 185       CloseHandle (hImage);
 186       return -1;
 187     }
 188
 189   SectionOffset = CoffHeaderOffset + IMAGE_SIZEOF_FILE_HEADER +
 190     IMAGE_SIZEOF_NT_OPTIONAL_HEADER;
 191
 192   ReadBytes(hImage, &image_file_header, IMAGE_SIZEOF_FILE_HEADER);
 193
 194   /*
 195    *  Read optional header.
 196    */
 197   ReadBytes(hImage,
 198             &image_optional_header,
 199             IMAGE_SIZEOF_NT_OPTIONAL_HEADER);
 200
 201   CloseHandle (hImage);
 202
 203   switch (image_optional_header.Subsystem)
 204     {
 205     case IMAGE_SUBSYSTEM_UNKNOWN:
 206         return 1;
 207         break;
 208
 209     case IMAGE_SUBSYSTEM_NATIVE:
 210         return 1;
 211         break;
 212
 213     case IMAGE_SUBSYSTEM_WINDOWS_GUI:
 214         return 1;
 215         break;
 216
 217     case IMAGE_SUBSYSTEM_WINDOWS_CUI:
 218         return 0;
 219         break;
 220
 221     case IMAGE_SUBSYSTEM_OS2_CUI:
 222         return 0;
 223         break;
 224
 225     case IMAGE_SUBSYSTEM_POSIX_CUI:
 226         return 0;
 227         break;
 228
 229     default:
 230         /* Unknown, return GUI app to be preservative: if yes, it will be
 231            correctly launched, if no, it will be launched, and a console will
 232            be also displayed, which is not a big deal */
 233         return 1;
 234         break;
 235     }
 236
 237 }
 238
 239 static DWORD
 240 AbsoluteSeek (HANDLE hFile, DWORD offset)
 241 {
 242     DWORD newOffset;
 243
 244     newOffset = SetFilePointer (hFile, offset, NULL, FILE_BEGIN);
 245
 246     if (newOffset == 0xFFFFFFFF)
 247       return -1;
 248     else
 249       return newOffset;
 250 }
 251
 252 static VOID
 253 ReadBytes (HANDLE hFile, LPVOID buffer, DWORD size)
 254 {
 255   DWORD bytes;
 256
 257   if (!ReadFile(hFile, buffer, size, &bytes, NULL))
 258     {
 259       size = 0;
 260       return;
 261     }
 262   else if (size != bytes)
 263     {
 264       return;
 265     }
 266 }
 267
 268 static int
 269 nt_spawnve (char *exe, char **argv, char *env, struct TTY_Process *process)
 270 {
 271   STARTUPINFO start;
 272   SECURITY_ATTRIBUTES sec_attrs;
 273   SECURITY_DESCRIPTOR sec_desc;
 274   DWORD flags;
 275   char dir[ MAXPATHLEN ];
 276   int pid;
 277   int is_gui, use_cmd;
 278   char *cmdline, *parg, **targ;
 279   int do_quoting = 0;
 280   char escape_char;
 281   int arglen;
 282
 283   /* we have to do some conjuring here to put argv and envp into the
 284      form CreateProcess wants...  argv needs to be a space separated/null
 285      terminated list of parameters, and envp is a null
 286      separated/double-null terminated list of parameters.
 287
 288      Additionally, zero-length args and args containing whitespace or
 289      quote chars need to be wrapped in double quotes - for this to work,
 290      embedded quotes need to be escaped as well.  The aim is to ensure
 291      the child process reconstructs the argv array we start with
 292      exactly, so we treat quotes at the beginning and end of arguments
 293      as embedded quotes.
 294
 295      Note that using backslash to escape embedded quotes requires
 296      additional special handling if an embedded quote is already
 297      preceeded by backslash, or if an arg requiring quoting ends with
 298      backslash.  In such cases, the run of escape characters needs to be
 299      doubled.  For consistency, we apply this special handling as long
 300      as the escape character is not quote.
 301
 302      Since we have no idea how large argv and envp are likely to be we
 303      figure out list lengths on the fly and allocate them.  */
 304
 305   if (!NILP (Vw32_quote_process_args))
 306     {
 307       do_quoting = 1;
 308       /* Override escape char by binding w32-quote-process-args to
 309          desired character, or use t for auto-selection.  */
 310       if (INTEGERP (Vw32_quote_process_args))
 311         escape_char = XINT (Vw32_quote_process_args);
 312       else
 313         escape_char = '\\';
 314     }
 315
 316   /* do argv...  */
 317   arglen = 0;
 318   targ = argv;
 319   while (*targ)
 320     {
 321       char *p = *targ;
 322       int need_quotes = 0;
 323       int escape_char_run = 0;
 324
 325       if (*p == 0)
 326         need_quotes = 1;
 327       for ( ; *p; p++)
 328         {
 329           if (*p == '"')
 330             {
 331               /* allow for embedded quotes to be escaped */
 332               arglen++;
 333               need_quotes = 1;
 334               /* handle the case where the embedded quote is already escaped */
 335               if (escape_char_run > 0)
 336                 {
 337                   /* To preserve the arg exactly, we need to double the
 338                      preceding escape characters (plus adding one to
 339                      escape the quote character itself).  */
 340                   arglen += escape_char_run;
 341                 }
 342             }
 343           else if (*p == ' ' || *p == '\t')
 344             {
 345               need_quotes = 1;
 346             }
 347
 348           if (*p == escape_char && escape_char != '"')
 349             escape_char_run++;
 350           else
 351             escape_char_run = 0;
 352         }
 353       if (need_quotes)
 354         {
 355           arglen += 2;
 356           /* handle the case where the arg ends with an escape char - we
 357              must not let the enclosing quote be escaped.  */
 358           if (escape_char_run > 0)
 359             arglen += escape_char_run;
 360         }
 361       arglen += strlen (*targ) + 1;
 362       targ++;
 363     }
 364
 365   is_gui = is_gui_app (argv[0]);
 366   use_cmd = FALSE;
 367
 368   if (is_gui == -1) {
 369     /* could not determine application type. Try launching with "cmd /c" */
 370     is_gui = FALSE;
 371     arglen += 7;
 372     use_cmd = TRUE;
 373   }
 374
 375   cmdline = (char*)malloc (arglen + 1);
 376   targ = argv;
 377   parg = cmdline;
 378
 379   if (use_cmd == TRUE) {
 380     strcpy (parg, "cmd /c ");
 381     parg += 7;
 382   }
 383
 384   while (*targ)
 385     {
 386       char * p = *targ;
 387       int need_quotes = 0;
 388
 389       if (*p == 0)
 390         need_quotes = 1;
 391
 392       if (do_quoting)
 393         {
 394           for ( ; *p; p++)
 395             if (*p == ' ' || *p == '\t' || *p == '"')
 396               need_quotes = 1;
 397         }
 398       if (need_quotes)
 399         {
 400           int escape_char_run = 0;
 401           char * first;
 402           char * last;
 403
 404           p = *targ;
 405           first = p;
 406           last = p + strlen (p) - 1;
 407           *parg++ = '"';
 408           for ( ; *p; p++)
 409             {
 410               if (*p == '"')
 411                 {
 412                   /* double preceding escape chars if any */
 413                   while (escape_char_run > 0)
 414                     {
 415                       *parg++ = escape_char;
 416                       escape_char_run--;
 417                     }
 418                   /* escape all quote chars, even at beginning or end */
 419                   *parg++ = escape_char;
 420                 }
 421               *parg++ = *p;
 422
 423               if (*p == escape_char && escape_char != '"')
 424                 escape_char_run++;
 425               else
 426                 escape_char_run = 0;
 427             }
 428           /* double escape chars before enclosing quote */
 429           while (escape_char_run > 0)
 430             {
 431               *parg++ = escape_char;
 432               escape_char_run--;
 433             }
 434           *parg++ = '"';
 435         }
 436       else
 437         {
 438           strcpy (parg, *targ);
 439           parg += strlen (*targ);
 440         }
 441       *parg++ = ' ';
 442       targ++;
 443     }
 444   *--parg = '\0';
 445
 446   memset (&start, 0, sizeof (start));
 447   start.cb = sizeof (start);
 448
 449   if (process->usePipe == TRUE) {
 450     start.dwFlags = STARTF_USESTDHANDLES;
 451     start.hStdInput = process->w_forkin;
 452     start.hStdOutput = process->w_forkout;
 453     /* child's stderr is always redirected to outfd */
 454     start.hStdError = process->w_forkout;
 455   } else {
 456     start.dwFlags = STARTF_USESTDHANDLES;
 457     /* We only need to redirect stderr/stdout here. Stdin will be forced to
 458        the spawned process console by explaunch */
 459     start.hStdInput = NULL;
 460     start.hStdOutput = process->w_forkout;
 461     start.hStdError = process->w_forkout;
 462   }
 463
 464   /* Explicitly specify no security */
 465   if (!InitializeSecurityDescriptor (&sec_desc, SECURITY_DESCRIPTOR_REVISION))
 466     goto EH_Fail;
 467   if (!SetSecurityDescriptorDacl (&sec_desc, TRUE, NULL, FALSE))
 468     goto EH_Fail;
 469   sec_attrs.nLength = sizeof (sec_attrs);
 470   sec_attrs.lpSecurityDescriptor = &sec_desc;
 471   sec_attrs.bInheritHandle = FALSE;
 472
 473   /* creating a new console allow easier close. Do not use
 474      CREATE_NEW_PROCESS_GROUP as this results in disabling Ctrl+C */
 475   flags = CREATE_NEW_CONSOLE;
 476   if (NILP (Vw32_start_process_inherit_error_mode))
 477     flags |= CREATE_DEFAULT_ERROR_MODE;
 478
 479   /* if app is not a gui application, hide the console */
 480   if (is_gui == FALSE) {
 481     start.dwFlags |= STARTF_USESHOWWINDOW;
 482     start.wShowWindow = SW_HIDE;
 483   }
 484
 485   /* Set initial directory to null character to use current directory */
 486   if (!CreateProcess (NULL, cmdline, &sec_attrs, NULL, TRUE,
 487                       flags, env, NULL, &start, &process->procinfo))
 488     goto EH_Fail;
 489
 490   pid = (int) process->procinfo.hProcess;
 491   process->pid=pid;
 492
 493   return pid;
 494
 495  EH_Fail:
 496   return -1;
 497 }
 498
 499 /*************************
 500  ** __gnat_send_header ()
 501  *************************/
 502
 503 #define EXP_SLAVE_CREATE 'c'
 504 #define EXP_SLAVE_KEY    'k'
 505 #define EXP_SLAVE_MOUSE  'm'
 506 #define EXP_SLAVE_WRITE  'w'
 507 #define EXP_SLAVE_KILL   'x'
 508
 509 #define EXP_KILL_TERMINATE  0x1
 510 #define EXP_KILL_CTRL_C     0x2
 511 #define EXP_KILL_CTRL_BREAK 0x4
 512
 513 void
 514 __gnat_send_header (struct TTY_Process* p, char header[5], int size, int *ret)
 515 {
 516   if (p->usePipe == FALSE) {
 517     header[0] = EXP_SLAVE_WRITE;
 518     header[1] = size & 0xff;
 519     header[2] = (size & 0xff00) >> 8;
 520     header[3] = (size & 0xff0000) >> 16;
 521     header[4] = (size & 0xff000000) >> 24;
 522     *ret = 1;
 523   } else {
 524     *ret = 0;
 525   }
 526 }
 527
 528 /**********************************
 529  **  __gnat_setup_communication ()
 530  **********************************/
 531
 532 int
 533 __gnat_setup_communication (struct TTY_Process** process_out) /* output param */
 534 {
 535   struct TTY_Process* process;
 536
 537   process = (struct TTY_Process*)malloc (sizeof (struct TTY_Process));
 538   ZeroMemory (process, sizeof (struct TTY_Process));
 539   *process_out = process;
 540
 541   return 0;
 542 }
 543
 544 #define EXP_PIPE_BASENAME "\\\\.\\pipe\\ExpectPipe"
 545
 546 int
 547 __gnat_setup_child_communication
 548   (struct TTY_Process* process,
 549    char** argv,
 550    int Use_Pipes)
 551 {
 552   int cpid;
 553   HANDLE parent;
 554   SECURITY_ATTRIBUTES sec_attrs;
 555   char slavePath [MAX_PATH];
 556   char **nargv;
 557   int argc;
 558   int i;
 559   char pipeNameIn[100];
 560   HANDLE hSlaveInDrv = NULL; /* Handle to communicate with slave driver */
 561
 562   parent = GetCurrentProcess ();
 563
 564   /* Set inheritance for the pipe handles */
 565   sec_attrs.nLength = sizeof (SECURITY_ATTRIBUTES);
 566   sec_attrs.bInheritHandle = TRUE;
 567   sec_attrs.lpSecurityDescriptor = NULL;
 568
 569   if (Use_Pipes) {
 570     /* Create in and out pipes */
 571     if (!CreatePipe (&process->w_forkin, &process->w_infd, &sec_attrs, 0))
 572       report_file_error ("Creation of child's IN handle", Qnil);
 573     if (!CreatePipe (&process->w_outfd, &process->w_forkout, &sec_attrs, 0))
 574       report_file_error ("Creation of child's OUT handle", Qnil);
 575
 576     /* Do not inherit the parent's side of the pipes */
 577     SetHandleInformation (&process->w_infd, HANDLE_FLAG_INHERIT, 0);
 578     SetHandleInformation (&process->w_outfd, HANDLE_FLAG_INHERIT, 0);
 579
 580     /* use native argv */
 581     nargv = argv;
 582     process->usePipe = TRUE;
 583
 584   } else {
 585     static int pipeNameId = 0;
 586
 587     process->w_infd = NULL;
 588
 589     /* We create a named pipe for Input, as we handle input by sending special
 590        commands to the explaunch process, that uses it to feed the actual input
 591        of the process */
 592     sprintf(pipeNameIn, "%sIn%08x_%08x", EXP_PIPE_BASENAME,
 593             GetCurrentProcessId(), pipeNameId);
 594     pipeNameId++;
 595
 596     hSlaveInDrv = CreateNamedPipe(pipeNameIn,
 597                                   PIPE_ACCESS_OUTBOUND,
 598                                   PIPE_TYPE_BYTE | PIPE_WAIT, 1, 8192, 8192,
 599                                   20000, NULL);
 600     if (hSlaveInDrv == NULL)  goto end;
 601
 602     if (!CreatePipe (&process->w_outfd, &process->w_forkout, &sec_attrs, 0))
 603       report_file_error ("Creation of child's OUT handle", Qnil);
 604
 605     if (SearchPath (NULL, "explaunch.exe", NULL,
 606                     MAX_PATH, slavePath, NULL) == 0) goto end;
 607
 608     for (argc=0; argv[argc] != NULL; argc++) ;
 609     nargv = (char **) malloc (sizeof (char*) * (argc + 3));
 610     nargv[0] = slavePath;
 611     nargv[1] = pipeNameIn;
 612
 613     for (i = 0; i <= argc; i++) nargv[i + 2] = argv[i];
 614     process->usePipe = FALSE;
 615   }
 616
 617   /* Spawn the child. */
 618   cpid = nt_spawnve (nargv[0], nargv, NULL, process);
 619
 620   /* close the duplicated handles passed to the child */
 621   CloseHandle (process->w_forkout);
 622
 623   if (process->usePipe == TRUE) {
 624     CloseHandle (process->w_forkin);
 625
 626   } else {
 627     UCHAR buf[8];               /* enough space for child status info */
 628     DWORD count;
 629     BOOL bRet;
 630     DWORD dwRet;
 631
 632     /*
 633      * Wait for connection with the slave driver
 634      */
 635     bRet = ConnectNamedPipe(hSlaveInDrv, NULL);
 636     if (bRet == FALSE) {
 637       dwRet = GetLastError();
 638       if (dwRet == ERROR_PIPE_CONNECTED) {
 639         ;
 640       } else {
 641         goto end;
 642       }
 643     }
 644
 645     process->w_infd = hSlaveInDrv;
 646
 647     /*
 648      * wait for slave driver to initialize before allowing user to send to it
 649      */
 650     bRet = ReadFile(process->w_outfd, buf, 8, &count, NULL);
 651     if (bRet == FALSE) {
 652       cpid = -1;
 653     }
 654
 655     dwRet = buf[0] | (buf[1] << 8) | (buf[2] << 16) | (buf[3] << 24);
 656     if (dwRet != 0) {
 657       cpid = -1;
 658     }
 659
 660     cpid = buf[4] | (buf[5] << 8) | (buf[6] << 16) | (buf[7] << 24);
 661     process->pid = cpid;
 662   }
 663
 664   if (cpid == -1)
 665     /* An error occurred while trying to spawn the process.  */
 666     report_file_error ("Spawning child process", Qnil);
 667
 668   return cpid;
 669  end:
 670   if (hSlaveInDrv != NULL)
 671     CloseHandle (hSlaveInDrv);
 672   return -1;
 673 }
 674
 675 void
 676 __gnat_setup_parent_communication
 677   (struct TTY_Process* process,
 678    int* in,
 679    int* out,
 680    int* err,
 681    int* pid)
 682 {
 683   *in = _open_osfhandle ((long) process->w_infd, 0);
 684   *out = _open_osfhandle ((long) process->w_outfd, 0);
 685   /* child's stderr is always redirected to outfd */
 686   *err = *out;
 687   *pid = process->pid;
 688 }
 689
 690 typedef struct _child_process
 691 {
 692   HWND                 hwnd;
 693   PROCESS_INFORMATION *procinfo;
 694 } child_process;
 695
 696 /* The major and minor versions of NT.  */
 697 static int w32_major_version;
 698 static int w32_minor_version;
 699
 700 /* Distinguish between Windows NT and Windows 95.  */
 701 static enum {OS_UNKNOWN, OS_WIN95, OS_NT} os_subtype = OS_UNKNOWN;
 702
 703 /* Cache information describing the NT system for later use.  */
 704 static void
 705 cache_system_info (void)
 706 {
 707   union
 708     {
 709       struct info
 710         {
 711           char  major;
 712           char  minor;
 713           short platform;
 714         } info;
 715       DWORD data;
 716     } version;
 717
 718   /* Cache the version of the operating system.  */
 719   version.data = GetVersion ();
 720   w32_major_version = version.info.major;
 721   w32_minor_version = version.info.minor;
 722
 723   if (version.info.platform & 0x8000)
 724     os_subtype = OS_WIN95;
 725   else
 726     os_subtype = OS_NT;
 727 }
 728
 729 static BOOL CALLBACK
 730 find_child_console (HWND hwnd, child_process * cp)
 731 {
 732   DWORD thread_id;
 733   DWORD process_id;
 734
 735   thread_id = GetWindowThreadProcessId (hwnd, &process_id);
 736   if (process_id == cp->procinfo->dwProcessId)
 737     {
 738       char window_class[32];
 739
 740       GetClassName (hwnd, window_class, sizeof (window_class));
 741       if (strcmp (window_class,
 742                   (os_subtype == OS_WIN95)
 743                   ? "tty"
 744                   : "ConsoleWindowClass") == 0)
 745         {
 746           cp->hwnd = hwnd;
 747           return FALSE;
 748         }
 749     }
 750   /* keep looking */
 751   return TRUE;
 752 }
 753
 754 int
 755 __gnat_interrupt_process (struct TTY_Process* p)
 756 {
 757   char buf[2];
 758   DWORD written;
 759   BOOL bret;
 760
 761   if (p->usePipe == TRUE) {
 762     bret = FALSE;
 763   } else {
 764     buf[0] = EXP_SLAVE_KILL;
 765     buf[1] = EXP_KILL_CTRL_C;
 766     bret = WriteFile (p->w_infd, buf, 2, &written, NULL);
 767   }
 768
 769   if (bret == FALSE) {
 770     return __gnat_interrupt_pid (p->procinfo.dwProcessId);
 771   }
 772   return 0;
 773 }
 774
 775 int
 776 __gnat_interrupt_pid (int pid)
 777 {
 778   volatile child_process cp;
 779   int rc = 0;
 780
 781   cp.procinfo = (LPPROCESS_INFORMATION) malloc (sizeof (PROCESS_INFORMATION));
 782   cp.procinfo->dwProcessId = pid;
 783
 784   if (os_subtype == OS_UNKNOWN)
 785     cache_system_info ();
 786
 787   /* Try to locate console window for process. */
 788   EnumWindows ((WNDENUMPROC) find_child_console, (LPARAM) &cp);
 789
 790   if (cp.hwnd)
 791     {
 792       BYTE control_scan_code = (BYTE) MapVirtualKey (VK_CONTROL, 0);
 793       /* Retrieve Ctrl-C scancode */
 794       BYTE vk_break_code = 'C';
 795       BYTE break_scan_code = (BYTE) MapVirtualKey (vk_break_code, 0);
 796       HWND foreground_window;
 797
 798       foreground_window = GetForegroundWindow ();
 799       if (foreground_window)
 800         {
 801           /* NT 5.0, and apparently also Windows 98, will not allow
 802              a Window to be set to foreground directly without the
 803              user's involvement. The workaround is to attach
 804              ourselves to the thread that owns the foreground
 805              window, since that is the only thread that can set the
 806              foreground window.  */
 807           DWORD foreground_thread, child_thread;
 808
 809           foreground_thread =
 810             GetWindowThreadProcessId (foreground_window, NULL);
 811           if (foreground_thread == GetCurrentThreadId ()
 812               || !AttachThreadInput (GetCurrentThreadId (),
 813                                      foreground_thread, TRUE))
 814             foreground_thread = 0;
 815
 816           child_thread = GetWindowThreadProcessId (cp.hwnd, NULL);
 817           if (child_thread == GetCurrentThreadId ()
 818               || !AttachThreadInput (GetCurrentThreadId (),
 819                                      child_thread, TRUE))
 820             child_thread = 0;
 821
 822           /* Set the foreground window to the child.  */
 823           if (SetForegroundWindow (cp.hwnd))
 824             {
 825               /* Generate keystrokes as if user had typed Ctrl-Break or
 826                  Ctrl-C.  */
 827               keybd_event (VK_CONTROL, control_scan_code, 0, 0);
 828               keybd_event (vk_break_code, break_scan_code,
 829                 (vk_break_code == 'C' ? 0 : KEYEVENTF_EXTENDEDKEY), 0);
 830               keybd_event (vk_break_code, break_scan_code,
 831                 (vk_break_code == 'C' ? 0 : KEYEVENTF_EXTENDEDKEY)
 832                  | KEYEVENTF_KEYUP, 0);
 833               keybd_event (VK_CONTROL, control_scan_code, KEYEVENTF_KEYUP, 0);
 834
 835               /* Sleep for a bit to give time for the main frame to respond
 836               to focus change events.  */
 837               Sleep (100);
 838
 839               SetForegroundWindow (foreground_window);
 840             }
 841           /* Detach from the foreground and child threads now that
 842              the foreground switching is over.  */
 843           if (foreground_thread)
 844             AttachThreadInput (GetCurrentThreadId (), foreground_thread, FALSE);
 845           if (child_thread)
 846             AttachThreadInput (GetCurrentThreadId (), child_thread, FALSE);
 847         }
 848     }
 849   /* Ctrl-Break is NT equivalent of SIGINT.  */
 850   else if (!GenerateConsoleCtrlEvent
 851              (CTRL_BREAK_EVENT, cp.procinfo->dwProcessId))
 852     {
 853       errno = EINVAL;
 854       rc = -1;
 855     }
 856
 857   free (cp.procinfo);
 858   return rc;
 859 }
 860
 861 /* kill a process, as this implementation use CreateProcess on Win32 we need
 862    to use Win32 TerminateProcess API */
 863 int
 864 __gnat_terminate_process (struct TTY_Process* p)
 865 {
 866   char buf[2];
 867   DWORD written;
 868   BOOL bret;
 869
 870   if (p->usePipe == TRUE) {
 871     bret = FALSE;
 872   } else {
 873     buf[0] = EXP_SLAVE_KILL;
 874     buf[1] = EXP_KILL_TERMINATE;
 875     bret = WriteFile (p->w_infd, buf, 2, &written, NULL);
 876   }
 877
 878   if (bret == FALSE) {
 879     if (!TerminateProcess (p->procinfo.hProcess, 1))
 880       return -1;
 881     else
 882       return 0;
 883   } else
 884     return 0;
 885 }
 886
 887 /* wait for process pid to terminate and return the process status. This
 888    implementation is different from the adaint.c one for Windows as it uses
 889    the Win32 API instead of the C one. */
 890
 891 int
 892 __gnat_tty_waitpid (struct TTY_Process* p)
 893 {
 894   DWORD exitcode;
 895   DWORD res;
 896   HANDLE proc_hand = p->procinfo.hProcess;
 897
 898   res = WaitForSingleObject (proc_hand, 0);
 899   GetExitCodeProcess (proc_hand, &exitcode);
 900
 901   CloseHandle (p->procinfo.hThread);
 902   CloseHandle (p->procinfo.hProcess);
 903
 904   /* No need to close the handles: they were closed on the ada side */
 905
 906   return (int) exitcode;
 907 }
 908
 909 /********************************
 910  **  __gnat_free_process ()
 911  ********************************/
 912
 913 void
 914 __gnat_free_process (struct TTY_Process** process)
 915 {
 916   free (*process);
 917   *process = NULL;
 918 }
 919
 920 /* TTY handling */
 921
 922 typedef struct {
 923   int tty_fd;        /* descriptor for the tty */
 924   char tty_name[24]; /* Name of TTY device */
 925 } TTY_Handle;
 926
 927 int
 928 __gnat_tty_supported (void)
 929 {
 930   return 0;
 931 }
 932
 933 /* Return the tty name associated with p */
 934
 935 char *
 936 __gnat_tty_name (TTY_Handle* t)
 937 {
 938   return t->tty_name;
 939 }
 940
 941 int
 942 __gnat_tty_fd (TTY_Handle* t)
 943 {
 944   return t->tty_fd;
 945 }
 946
 947 TTY_Handle*
 948 __gnat_new_tty (void)
 949 {
 950   return (TTY_Handle*)0;
 951 }
 952
 953 void
 954 __gnat_reset_tty (TTY_Handle* t)
 955 {
 956   return;
 957 }
 958
 959 void
 960 __gnat_close_tty (TTY_Handle* t)
 961 {
 962   free (t);
 963 }
 964
 965 void
 966 __gnat_setup_winsize (void *desc, int rows, int columns)
 967 {
 968 }
 969
 970 #else /* defined(_WIN32, implementatin for all UNIXes */
 971
 972 /* First defined some macro to identify easily some systems */
 973 #if defined (__FreeBSD__) \
 974  || defined (__OpenBSD__) \
 975  || defined (__NetBSD__)  \
 976  || defined (__DragonFly__)
 977 #   define FREEBSD
 978 #endif
 979 #if defined (__mips) && defined (__sgi)
 980 #   define IRIX
 981 #endif
 982
 983 /* Include every system header we need */
 984 #define _GNU_SOURCE
 985 #include <errno.h>
 986 #include <stdio.h>
 987 #include <stdlib.h>
 988
 989 /* On some system termio is either absent or including it will disable termios
 990    (HP-UX) */
 991 #if ! defined (__hpux__) && ! defined (FREEBSD) && \
 992     ! defined (__APPLE__) && ! defined(__rtems__)
 993 #   include <termio.h>
 994 #endif
 995
 996 #include <sys/ioctl.h>
 997 #include <termios.h>
 998 #include <fcntl.h>
 999 #include <string.h>
1000 #include <sys/stat.h>
1001 #include <sys/types.h>
1002 #include <sys/wait.h>
1003 #include <unistd.h>
1004 #if defined (sun)
1005 #   include <sys/stropts.h>
1006 #endif
1007 #if defined (FREEBSD) || defined (sun)
1008 #   include <sys/signal.h>
1009 #endif
1010 #if defined (__hpux__)
1011 #   include <sys/termio.h>
1012 #   include <sys/stropts.h>
1013 #endif
1014
1015 #define CDISABLE _POSIX_VDISABLE
1016
1017 /* On HP-UX and Sun system, there is a bzero function but with a different
1018    signature. Use memset instead */
1019 #if defined (__hpux__) || defined (sun) || defined (_AIX)
1020 #   define bzero(s,n) memset (s,0,n)
1021 #endif
1022
1023 /* POSIX does not specify how to open the master side of a terminal.Several
1024    methods are available (system specific):
1025       1- using a cloning device (USE_CLONE_DEVICE)
1026       2- getpt                  (USE_GETPT)
1027       3- openpty                (USE_OPENPTY)
1028       4- _getpty                (USE_GETPTY)
1029
1030    When using the cloning device method, the macro USE_CLONE_DEVICE should
1031    contains a full path to the adequate device.
1032
1033    When a new system is about to be supported, one of the previous macro should
1034    be set otherwise allocate_pty_desc will return an error
1035 */
1036
1037 /* Configurable part */
1038 #if defined (__APPLE__) || defined (FREEBSD)
1039 #define USE_OPENPTY
1040 #elif defined (IRIX)
1041 #define USE_GETPTY
1042 #elif defined (linux)
1043 #define USE_GETPT
1044 #elif defined (sun)
1045 #define USE_CLONE_DEVICE "/dev/ptmx"
1046 #elif defined (_AIX)
1047 #define USE_CLONE_DEVICE "/dev/ptc"
1048 #elif defined (__hpux__)
1049 /* On HP-UX we use the streamed version. Using the non streamed version is not
1050    recommanded (through "/dev/ptym/clone"). Indeed it seems that there are
1051    issues to detect process terminations. */
1052 #define USE_CLONE_DEVICE "/dev/ptmx"
1053 #endif
1054
1055 /* structure that holds information about the terminal used and the process
1056    connected on the slave side */
1057 typedef struct pty_desc_struct {
1058    int  master_fd;     /* fd of the master side if the terminal */
1059    int  slave_fd;      /* fd of the slave side */
1060    char slave_name[32];   /* filename of the slave side */
1061    int  child_pid;     /* PID of the child process connected to the slave side
1062                          of the terminal */
1063 } pty_desc;
1064
1065 /* allocate_pty_desc - allocate a pseudo terminal
1066  *
1067  * PARAMETERS
1068  *   out desc  returned pointer to a pty_desc structure containing information
1069  *             about the opened pseudo terminal
1070  * RETURN VALUE
1071  *   -1        if failed
1072  *    0        if ok
1073  * COMMENTS
1074  *   If the function is successful we should have at least the master side fd
1075  *   and the slave side filename. On some system, the slave side will also be
1076  *   opened. If this is not the case the slave side will be open once we are in
1077  *   the child process (note that opening the slave side at this stage will
1078  *   failed...).
1079  */
1080
1081 extern char* ptsname (int);
1082
1083 static int
1084 allocate_pty_desc (pty_desc **desc) {
1085
1086    pty_desc *result;
1087    int  status      =  0;
1088    int  slave_fd    = -1;
1089    int  master_fd   = -1;
1090    char *slave_name = NULL;
1091
1092 #ifdef USE_GETPT
1093   master_fd = getpt ();
1094 #elif defined (USE_OPENPTY)
1095   status = openpty (&master_fd, &slave_fd, NULL, NULL, NULL);
1096 #elif defined (USE_GETPTY)
1097   slave_name = _getpty (&master_fd, O_RDWR | O_NDELAY, 0600, 0);
1098   if (slave_name == NULL) status = -1;
1099 #elif defined (USE_CLONE_DEVICE)
1100   master_fd = open (USE_CLONE_DEVICE, O_RDWR | O_NONBLOCK, 0);
1101 #else
1102   printf ("[error]: terminal support is not configured\n");
1103   return -1;
1104 #endif
1105
1106   /* at this stage we should have the master side fd and status should be 0 */
1107   if (status != 0 || master_fd < 0)
1108     {
1109       /* If this is not the case close all opened files and return -1 */
1110       printf ("[error]: cannot allocate master side of the pty\n");
1111       if (master_fd >= 0) close (master_fd);
1112       if (slave_fd  >= 0) close (slave_fd);
1113       *desc = NULL;
1114       return -1;
1115     }
1116
1117   /* retrieve the file name of the slave side if necessary */
1118   if (slave_name == NULL) slave_name = (char *) ptsname (master_fd);
1119
1120   /* Now we should have slave file name */
1121   if (slave_name == NULL)
1122     {
1123       /* If not the case close any opened file and return - 1 */
1124       printf ("[error]: cannot allocate slave side of the pty\n");
1125       if (master_fd >= 0) close (master_fd);
1126       if (slave_fd  >= 0) close (slave_fd);
1127       *desc = NULL;
1128       return -1;
1129     }
1130
1131 #if !defined(__rtems__)
1132   /* grant access to the slave side */
1133   grantpt (master_fd);
1134   /* unlock the terminal */
1135   unlockpt (master_fd);
1136 #endif
1137
1138   /* set desc and return 0 */
1139   result = malloc (sizeof (pty_desc));
1140   result->master_fd  = master_fd;
1141   result->slave_fd   = slave_fd;
1142   /* the string returned by ptsname or _getpty is a static allocated string. So
1143      we should make a copy */
1144   strncpy (result->slave_name, slave_name, sizeof (result->slave_name));
1145   result->slave_name[sizeof (result->slave_name) - 1] = '\0';
1146   result->child_pid  = -1;
1147   *desc=result;
1148   return 0;
1149 }
1150
1151 /* some utility macro that make the code of child_setup_tty easier to read */
1152 #define __enable(a, b) ((a) |= (b))
1153 #define __disable(a, b) ((a) &= ~(b))
1154
1155 /* some properties do not exist on all systems. Set their value to 0 in that
1156    case */
1157 #ifndef IUCLC
1158 #define IUCLC 0
1159 #endif
1160 #ifndef OLCUC
1161 #define OLCUC 0
1162 #endif
1163 #ifndef NLDLY
1164 #define NLDLY 0
1165 #define CRDLY 0
1166 #define TABDLY 0
1167 #define BSDLY 0
1168 #define VTDLY 0
1169 #define FFDLY 0
1170 #endif
1171
1172 /* child_setup_tty - set terminal properties
1173  *
1174  * PARAMETERS
1175  *   file descriptor of the slave side of the terminal
1176  *
1177  * RETURN VALUE
1178  *   0 if success, any other value if failed.
1179  *
1180  * COMMENTS
1181  *   None
1182  */
1183 static int
1184 child_setup_tty (int fd)
1185 {
1186   struct termios s;
1187   int    status;
1188
1189   /* ensure that s is filled with 0 */
1190   bzero (&s, sizeof (&s));
1191
1192   /* Get the current terminal settings */
1193   status = tcgetattr (fd, &s);
1194   if (status != 0) return -1;
1195
1196   /* Adjust input modes */
1197   __disable (s.c_iflag, IUCLC);    /* don't transform to lower case */
1198   __disable (s.c_iflag, ISTRIP);   /* don't delete 8th bit */
1199
1200   /* Adjust output modes */
1201   __enable  (s.c_oflag, OPOST);    /* enable postprocessing */
1202   __disable (s.c_oflag, ONLCR);    /* don't map LF to CR-LF */
1203   __disable (s.c_oflag, NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
1204                                    /* disable delays */
1205   __disable (s.c_oflag, OLCUC);    /* don't transform to upper case */
1206
1207   /* Adjust control modes */
1208   s.c_cflag = (s.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
1209
1210   /* Adjust local modes */
1211   __disable (s.c_lflag, ECHO);     /* disable echo */
1212   __enable  (s.c_lflag, ISIG);     /* enable signals */
1213   __enable  (s.c_lflag, ICANON);   /* erase/kill/eof processing */
1214
1215   /* Adjust control characters */
1216   /* IMPORTANT: we need to ensure that Ctrl-C will trigger an interrupt signal
1217      otherwise send_signal_via_characters will fail */
1218   s.c_cc[VEOF]   = 04;         /* insure that EOF is Control-D */
1219   s.c_cc[VERASE] = CDISABLE;   /* disable erase processing */
1220   s.c_cc[VKILL]  = CDISABLE;   /* disable kill processing */
1221   s.c_cc[VQUIT]  = 28;         /* Control-\ */
1222   s.c_cc[VINTR]  = 03;         /* Control-C */
1223   s.c_cc[VEOL]   = CDISABLE;
1224   s.c_cc[VSUSP]  = 26;         /* Control-Z */
1225
1226   /* push our changes */
1227   status = tcsetattr (fd, TCSADRAIN, &s);
1228   return status;
1229 }
1230
1231 /* __gnat_setup_communication - interface to the external world. Should be
1232  * called before forking. On Unixes this function only call allocate_pty_desc.
1233  * The Windows implementation (in different part of this file) is very
1234  * different.
1235  *
1236  * PARAMETERS
1237  *  out desc   returned pointer to a pty_desc structure
1238  * RETURN VALUE
1239  *  0 if success, -1 otherwise
1240  */
1241 int __gnat_setup_communication (pty_desc** desc) {
1242   return allocate_pty_desc (desc);
1243 }
1244
1245 /* __gnat_setup_parent_communication - interface to the external world. Should
1246  * be called after forking in the parent process
1247  *
1248  * PARAMETERS
1249  *   out in_fd
1250      out out_fd
1251      out err_fd fds corresponding to the parent side of the
1252                 terminal
1253      in pid_out child process pid
1254  * RETRUN VALUE
1255  *  0
1256  */
1257 void
1258 __gnat_setup_parent_communication
1259   (pty_desc *desc,
1260    int*     in_fd,  /* input */
1261    int*     out_fd, /* output */
1262    int*     err_fd, /* error */
1263    int*     pid_out)
1264 {
1265
1266   *in_fd = desc->master_fd;
1267   *out_fd= desc->master_fd;
1268   *err_fd= desc->master_fd;
1269   desc->child_pid = *pid_out;
1270 }
1271
1272 /* __gnat_setup_winsize - Sets up the size of the terminal
1273  * This lets the process know the size of the terminal
1274  */
1275
1276 void __gnat_setup_winsize (pty_desc *desc, int rows, int columns) {
1277 #ifdef TIOCGWINSZ
1278   struct winsize s;
1279   s.ws_row = (unsigned short)rows;
1280   s.ws_col = (unsigned short)columns;
1281   s.ws_xpixel = 0;
1282   s.ws_ypixel = 0;
1283   ioctl (desc->master_fd, TIOCSWINSZ, &s);
1284 #ifdef SIGWINCH
1285   if (desc->child_pid > 0) {
1286      /* Let the process know about the change in size */
1287      kill (desc->child_pid, SIGWINCH);
1288   }
1289 #endif
1290 #endif
1291 }
1292
1293 /* __gnat_setup_child_communication - interface to external world. Should be
1294  * called after forking in the child process. On Unixes, this function
1295  * first adjust the line setting, set standard output, input and error and
1296  * then spawn the program.
1297  *
1298  * PARAMETERS
1299  *   desc      a pty_desc structure containing the pty parameters
1300  *   new_argv  argv of the program to be spawned
1301  * RETURN VALUE
1302  *   this function should not return
1303  */
1304 int
1305 __gnat_setup_child_communication
1306    (pty_desc *desc,
1307     char **new_argv,
1308     int Use_Pipes)
1309 {
1310   int status;
1311   int pid = getpid ();
1312
1313   setsid ();
1314
1315   /* open the slave side of the terminal if necessary */
1316   if (desc->slave_fd == -1)
1317 #if defined (_AIX)
1318     /* On AIX, if the slave process is not opened with O_NDELAY or O_NONBLOCK
1319        then we might have some processes hanging on I/O system calls. Not sure
1320        we can do that for all platforms so do it only on AIX for the moment.
1321        On AIX O_NONBLOCK and O_NDELAY have slightly different meanings. When
1322        reading on the slave fd, in case there is no data available, if O_NDELAY
1323        is set then 0 is returned. If O_NON_BLOCK is -1 is returned. It seems
1324        that interactive programs such as GDB prefer the O_NDELAY behavior.
1325        We chose O_NONBLOCK because it allows us to make the distinction
1326        between a true EOF and an EOF returned because there is no data
1327        available to be read.  */
1328     desc->slave_fd = open (desc->slave_name, O_RDWR | O_NONBLOCK, 0);
1329 #else
1330     desc->slave_fd = open (desc->slave_name, O_RDWR, 0);
1331 #endif
1332
1333 #if defined (sun) || defined (__hpux__)
1334   /* On systems such as Solaris we are using stream. We need to push the right
1335      "modules" in order to get the expected terminal behaviors. Otherwise
1336      functionalities such as termios are not available.  */
1337   ioctl (desc->slave_fd, I_PUSH, "ptem");
1338   ioctl (desc->slave_fd, I_PUSH, "ldterm");
1339   ioctl (desc->slave_fd, I_PUSH, "ttcompat");
1340 #endif
1341
1342 #ifdef TIOCSCTTY
1343   /* make the tty the controling terminal */
1344   status = ioctl (desc->slave_fd, TIOCSCTTY, 0);
1345 #endif
1346
1347   /* adjust tty settings */
1348   child_setup_tty (desc->slave_fd);
1349   __gnat_setup_winsize (desc, 24, 80); /* To prevent errors in some shells */
1350
1351   /* stdin, stdout and stderr should be now our tty */
1352   dup2 (desc->slave_fd, 0);
1353   dup2 (desc->slave_fd, 1);
1354   dup2 (desc->slave_fd, 2);
1355   if (desc->slave_fd > 2) close (desc->slave_fd);
1356
1357   /* adjust process group settings */
1358   status = setpgid (pid, pid);
1359   status = tcsetpgrp (0, pid);
1360
1361   /* launch the program */
1362   execvp (new_argv[0], new_argv);
1363
1364   /* return the pid */
1365   return pid;
1366 }
1367
1368 /* send_signal_via_characters - Send a characters that will trigger a signal
1369  * in the child process.
1370  *
1371  * PARAMETERS
1372  *  desc  a pty_desc structure containing terminal information
1373  *  int   a signal number
1374  * RETURN VALUE
1375  *  None
1376  */
1377 static void
1378 send_signal_via_characters
1379   (pty_desc *desc,
1380    int signal_number)
1381 {
1382   char ctrl_c         = 03;
1383   char ctrl_backslash = 28;
1384   char ctrl_Z         = 26;
1385
1386   switch (signal_number)
1387     {
1388       case SIGINT:
1389         write (desc->master_fd, &ctrl_c, 1); return;
1390       case SIGQUIT:
1391         write (desc->master_fd, &ctrl_backslash, 1); return;
1392       case SIGTSTP:
1393         write (desc->master_fd, &ctrl_Z, 1); return;
1394     }
1395 }
1396
1397 /* __gnat_interrupt_process - interrupt the child process
1398  *
1399  * PARAMETERS
1400  *   desc a pty_desc structure
1401  */
1402 int
1403 __gnat_interrupt_process (pty_desc *desc)
1404 {
1405   send_signal_via_characters (desc, SIGINT);
1406   return 0;
1407 }
1408
1409 /* __gnat_interrupt_pid - interrupt a process group
1410  *
1411  * PARAMETERS
1412  *   pid  pid of the process to interrupt
1413  */
1414 int
1415 __gnat_interrupt_pid (int pid)
1416 {
1417   kill (-pid, SIGINT);
1418   return 0;
1419 }
1420
1421 /* __gnat_terminate_process - kill a child process
1422  *
1423  * PARAMETERS
1424  *   desc pty_desc structure
1425  */
1426 int __gnat_terminate_process (pty_desc *desc)
1427 {
1428   return kill (desc->child_pid, SIGKILL);
1429 }
1430
1431 /* __gnat_tty_waitpid - wait for the child proces to die
1432  *
1433  * PARAMETERS
1434  *   desc pty_desc structure
1435  * RETURN VALUE
1436  *   exit status of the child process
1437  */
1438 int
1439 __gnat_tty_waitpid (pty_desc *desc)
1440 {
1441   int status = 0;
1442   waitpid (desc->child_pid, &status, 0);
1443   return WEXITSTATUS (status);
1444 }
1445
1446 /* __gnat_tty_supported - Are tty supported ?
1447  *
1448  * RETURN VALUE
1449  *   always 1 on Unix systems
1450  */
1451 int
1452 __gnat_tty_supported (void)
1453 {
1454   return 1;
1455 }
1456
1457 /* __gnat_free_process - free a pty_desc structure
1458  *
1459  * PARAMETERS
1460  *   in out desc: a pty desc structure
1461  */
1462 void
1463 __gnat_free_process (pty_desc** desc)
1464 {
1465   free (*desc);
1466   *desc = NULL;
1467 }
1468
1469 /* __gnat_send_header - dummy function. this interface is only used on Windows */
1470 void
1471 __gnat_send_header (pty_desc* desc, char header[5], int size, int *ret)
1472 {
1473   *ret = 0;
1474 }
1475
1476 /* __gnat_reset_tty - reset line setting
1477  *
1478  * PARAMETERS
1479  *   desc: a pty_desc structure
1480  */
1481 void
1482 __gnat_reset_tty (pty_desc* desc)
1483 {
1484   child_setup_tty (desc->master_fd);
1485 }
1486
1487 /* __gnat_new_tty - allocate a new terminal
1488  *
1489  * RETURN VALUE
1490  *   a pty_desc structure
1491  */
1492 pty_desc *
1493 __gnat_new_tty (void)
1494 {
1495   int status;
1496   pty_desc* desc;
1497   status = allocate_pty_desc (&desc);
1498   child_setup_tty (desc->master_fd);
1499   return desc;
1500 }
1501
1502 /* __gnat_close_tty - close a terminal
1503  *
1504  * PARAMETERS
1505  *   desc  a pty_desc strucure
1506  */
1507 void __gnat_close_tty (pty_desc* desc)
1508 {
1509   if (desc->master_fd >= 0) close (desc->master_fd);
1510   if (desc->slave_fd  >= 0) close (desc->slave_fd);
1511 }
1512
1513 /* __gnat_tty_name - return slave side device name
1514  *
1515  * PARAMETERS
1516  *   desc  a pty_desc strucure
1517  * RETURN VALUE
1518  *   a string
1519  */
1520 char *
1521 __gnat_tty_name (pty_desc* desc)
1522 {
1523   return desc->slave_name;
1524 }
1525
1526 /* __gnat_tty_name - return master side fd
1527  *
1528  * PARAMETERS
1529  *   desc  a pty_desc strucure
1530  * RETURN VALUE
1531  *   a fd
1532  */
1533 int
1534 __gnat_tty_fd (pty_desc* desc)
1535 {
1536   return desc->master_fd;
1537 }
1538
1539 #endif /* WIN32 */