gcc/ada/sysdep.c

   1 /****************************************************************************
   2  *                                                                          *
   3  *                         GNAT COMPILER COMPONENTS                         *
   4  *                                                                          *
   5  *                                S Y S D E P                               *
   6  *                                                                          *
   7  *                          C Implementation File                           *
   8  *                                                                          *
   9  *          Copyright (C) 1992-2004 Free Software Foundation, Inc.          *
  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 2,  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.  See the GNU General Public License *
  17  * for  more details.  You should have  received  a copy of the GNU General *
  18  * Public License  distributed with GNAT;  see file COPYING.  If not, write *
  19  * to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, *
  20  * MA 02111-1307, USA.                                                      *
  21  *                                                                          *
  22  * As a  special  exception,  if you  link  this file  with other  files to *
  23  * produce an executable,  this file does not by itself cause the resulting *
  24  * executable to be covered by the GNU General Public License. This except- *
  25  * ion does not  however invalidate  any other reasons  why the  executable *
  26  * file might be covered by the  GNU Public License.                        *
  27  *                                                                          *
  28  * GNAT was originally developed  by the GNAT team at  New York University. *
  29  * Extensive contributions were provided by Ada Core Technologies Inc.      *
  30  *                                                                          *
  31  ****************************************************************************/
  32
  33 /* This file contains system dependent symbols that are referenced in the
  34    GNAT Run Time Library */
  35
  36 #ifdef __vxworks
  37 #include "ioLib.h"
  38 #include "selectLib.h"
  39 #include "vxWorks.h"
  40 #endif
  41 #ifdef IN_RTS
  42 #define POSIX
  43 #include "tconfig.h"
  44 #include "tsystem.h"
  45 #include <fcntl.h>
  46 #include <sys/stat.h>
  47 #include <time.h>
  48 #ifdef VMS
  49 #include <unixio.h>
  50 #endif
  51 #else
  52 #include "config.h"
  53 #include "system.h"
  54 #endif
  55
  56 #include "adaint.h"
  57
  58 /*
  59    mode_read_text
  60    open text file for reading
  61    rt for DOS and Windows NT, r for Unix
  62
  63    mode_write_text
  64    truncate to zero length or create text file for writing
  65    wt for DOS and Windows NT, w for Unix
  66
  67    mode_append_text
  68    append; open or create text file for writing at end-of-file
  69    at for DOS and Windows NT, a for Unix
  70
  71    mode_read_binary
  72    open binary file for reading
  73    rb for DOS and Windows NT, r for Unix
  74
  75    mode_write_binary
  76    truncate to zero length or create binary file for writing
  77    wb for DOS and Windows NT, w for Unix
  78
  79    mode_append_binary
  80    append; open or create binary file for writing at end-of-file
  81    ab for DOS and Windows NT, a for Unix
  82
  83    mode_read_text_plus
  84    open text file for update (reading and writing)
  85    r+t for DOS and Windows NT, r+ for Unix
  86
  87    mode_write_text_plus
  88    truncate to zero length or create text file for update
  89    w+t for DOS and Windows NT, w+ for Unix
  90
  91    mode_append_text_plus
  92    append; open or create text file for update, writing at end-of-file
  93    a+t for DOS and Windows NT, a+ for Unix
  94
  95    mode_read_binary_plus
  96    open binary file for update (reading and writing)
  97    r+b for DOS and Windows NT, r+ for Unix
  98
  99    mode_write_binary_plus
 100    truncate to zero length or create binary file for update
 101    w+b for DOS and Windows NT, w+ for Unix
 102
 103    mode_append_binary_plus
 104    append; open or create binary file for update, writing at end-of-file
 105    a+b for DOS and Windows NT, a+ for Unix
 106
 107    Notes:
 108
 109    (1) Opening a file with read mode fails if the file does not exist or
 110    cannot be read.
 111
 112    (2) Opening a file with append mode causes all subsequent writes to the
 113    file to be forced to the then current end-of-file, regardless of
 114    intervening calls to the fseek function.
 115
 116    (3) When a file is opened with update mode, both input and output may be
 117    performed on the associated stream.  However, output may not be directly
 118    followed by input without an intervening call to the fflush function or
 119    to a file positioning function (fseek, fsetpos, or rewind), and input
 120    may not be directly followed by output without an intervening call to a
 121    file positioning function, unless the input operation encounters
 122    end-of-file.
 123
 124    The other target dependent declarations here are for the two functions
 125    __gnat_set_binary_mode and __gnat_set_text_mode:
 126
 127       void __gnat_set_binary_mode (int handle);
 128       void __gnat_set_text_mode   (int handle);
 129
 130    These functions have no effect in Unix (or similar systems where there is
 131    no distinction between binary and text files), but in DOS (and similar
 132    systems where text mode does CR/LF translation), these functions allow
 133    the mode of the stream with the given handle (fileno can be used to get
 134    the handle of a stream) to be changed dynamically. The returned result
 135    is 0 if no error occurs and -1 if an error occurs.
 136
 137    Finally there is a boolean (character) variable
 138
 139       char __gnat_text_translation_required;
 140
 141    which is zero (false) in Unix mode, and one (true) in DOS mode, with a
 142    true value indicating that text translation is required on text files
 143    and that fopen supports the trailing t and b modifiers.
 144
 145 */
 146
 147 #if defined(WINNT) || defined (MSDOS) || defined (__EMX__)
 148 static const char *mode_read_text = "rt";
 149 static const char *mode_write_text = "wt";
 150 static const char *mode_append_text = "at";
 151 static const char *mode_read_binary = "rb";
 152 static const char *mode_write_binary = "wb";
 153 static const char *mode_append_binary = "ab";
 154 static const char *mode_read_text_plus = "r+t";
 155 static const char *mode_write_text_plus = "w+t";
 156 static const char *mode_append_text_plus = "a+t";
 157 static const char *mode_read_binary_plus = "r+b";
 158 static const char *mode_write_binary_plus = "w+b";
 159 static const char *mode_append_binary_plus = "a+b";
 160 const char __gnat_text_translation_required = 1;
 161
 162 void
 163 __gnat_set_binary_mode (int handle)
 164 {
 165   _setmode (handle, O_BINARY);
 166 }
 167
 168 void
 169 __gnat_set_text_mode (int handle)
 170 {
 171   _setmode (handle, O_TEXT);
 172 }
 173
 174 #ifdef __MINGW32__
 175 #include <windows.h>
 176
 177 /* Return the name of the tty.   Under windows there is no name for
 178    the tty, so this function, if connected to a tty, returns the generic name
 179    "console".  */
 180
 181 char *
 182 __gnat_ttyname (int filedes)
 183 {
 184   if (isatty (filedes))
 185     return "console";
 186   else
 187     return NULL;
 188 }
 189
 190 /* This function is needed to fix a bug under Win95/98. Under these plateforms
 191    doing :
 192                 ch1 = getch();
 193                 ch2 = fgetc (stdin);
 194
 195    will put the same character into ch1 and ch2. It seem that the character
 196    read by getch() is not correctly removed from the buffer. Even a
 197    fflush(stdin) does not fix the bug. This bug does not appear under Window
 198    NT. So we have two version of this routine below one for 95/98 and one for
 199    NT/2000 version of Windows. There is also a special routine (winflushinit)
 200    that will be called only the first time to check which version of Windows
 201    we are running running on to set the right routine to use.
 202
 203    This problem occurs when using Text_IO.Get_Line after Text_IO.Get_Immediate
 204    for example.
 205
 206    Calling FlushConsoleInputBuffer just after getch() fix the bug under
 207    95/98. */
 208
 209 static void winflush_init (void);
 210
 211 static void winflush_95 (void);
 212
 213 static void winflush_nt (void);
 214
 215 /* winflusfunction is set first to the winflushinit function which will check
 216    the OS version 95/98 or NT/2000 */
 217
 218 static void (*winflush_function) (void) = winflush_init;
 219
 220 /* This function does the runtime check of the OS version and then sets
 221    winflush_function to the appropriate function and then call it. */
 222
 223 static void
 224 winflush_init (void)
 225 {
 226   DWORD dwVersion = GetVersion();
 227
 228   if (dwVersion < 0x80000000)                /* Windows NT/2000 */
 229     winflush_function = winflush_nt;
 230   else                                       /* Windows 95/98   */
 231     winflush_function = winflush_95;
 232
 233   (*winflush_function)();      /* Perform the 'flush' */
 234
 235 }
 236
 237 static void winflush_95 (void)
 238 {
 239   FlushConsoleInputBuffer (GetStdHandle (STD_INPUT_HANDLE));
 240 }
 241
 242 static void winflush_nt (void)
 243 {
 244   /* Does nothing as there is no problem under NT.  */
 245 }
 246 #endif
 247
 248 #else
 249
 250 static const char *mode_read_text = "r";
 251 static const char *mode_write_text = "w";
 252 static const char *mode_append_text = "a";
 253 static const char *mode_read_binary = "r";
 254 static const char *mode_write_binary = "w";
 255 static const char *mode_append_binary = "a";
 256 static const char *mode_read_text_plus = "r+";
 257 static const char *mode_write_text_plus = "w+";
 258 static const char *mode_append_text_plus = "a+";
 259 static const char *mode_read_binary_plus = "r+";
 260 static const char *mode_write_binary_plus = "w+";
 261 static const char *mode_append_binary_plus = "a+";
 262 const char __gnat_text_translation_required = 0;
 263
 264 /* These functions do nothing in non-DOS systems. */
 265
 266 void
 267 __gnat_set_binary_mode (int handle ATTRIBUTE_UNUSED)
 268 {
 269 }
 270
 271 void
 272 __gnat_set_text_mode (int handle ATTRIBUTE_UNUSED)
 273 {
 274 }
 275 char *
 276 __gnat_ttyname (int filedes)
 277 {
 278 #ifndef __vxworks
 279   extern char *ttyname (int);
 280
 281   return ttyname (filedes);
 282
 283 #else
 284   return "";
 285
 286 #endif
 287 }
 288 #endif
 289 \f
 290 #if defined (linux) || defined (sun) || defined (sgi) || defined (__EMX__) \
 291   || (defined (__osf__) && ! defined (__alpha_vxworks)) || defined (WINNT) \
 292   || defined (__MACHTEN__) || defined (__hpux__) || defined (_AIX) \
 293   || (defined (__svr4__) && defined (i386)) || defined (__Lynx__) \
 294   || defined (__CYGWIN__) || defined (__FreeBSD__)
 295
 296 #ifdef __MINGW32__
 297 #if OLD_MINGW
 298 #include <termios.h>
 299 #else
 300 #include <conio.h>  /* for getch(), kbhit() */
 301 #endif
 302 #else
 303 #include <termios.h>
 304 #endif
 305
 306 #else
 307 #if defined (VMS)
 308 extern char *decc$ga_stdscr;
 309 static int initted = 0;
 310 #endif
 311 #endif
 312
 313 /* Implements the common processing for getc_immediate and
 314    getc_immediate_nowait. */
 315
 316 extern void getc_immediate (FILE *, int *, int *);
 317 extern void getc_immediate_nowait (FILE *, int *, int *, int *);
 318 extern void getc_immediate_common (FILE *, int *, int *, int *, int);
 319
 320 /* Called by Get_Immediate (Foo); */
 321
 322 void
 323 getc_immediate (FILE *stream, int *ch, int *end_of_file)
 324 {
 325   int avail;
 326
 327   getc_immediate_common (stream, ch, end_of_file, &avail, 1);
 328 }
 329
 330 /* Called by Get_Immediate (Foo, Available); */
 331
 332 void
 333 getc_immediate_nowait (FILE *stream, int *ch, int *end_of_file, int *avail)
 334 {
 335   getc_immediate_common (stream, ch, end_of_file, avail, 0);
 336 }
 337
 338 /* Called by getc_immediate () and getc_immediate_nowait () */
 339
 340 void
 341 getc_immediate_common (FILE *stream,
 342                        int *ch,
 343                        int *end_of_file,
 344                        int *avail,
 345                        int waiting)
 346 {
 347 #if defined (linux) || defined (sun) || defined (sgi) || defined (__EMX__) \
 348     || (defined (__osf__) && ! defined (__alpha_vxworks)) \
 349     || defined (__CYGWIN32__) || defined (__MACHTEN__) || defined (__hpux__) \
 350     || defined (_AIX) || (defined (__svr4__) && defined (i386)) \
 351     || defined (__Lynx__) || defined (__FreeBSD__)
 352   char c;
 353   int nread;
 354   int good_one = 0;
 355   int eof_ch = 4; /* Ctrl-D */
 356   int fd = fileno (stream);
 357   struct termios otermios_rec, termios_rec;
 358
 359   if (isatty (fd))
 360     {
 361       tcgetattr (fd, &termios_rec);
 362       memcpy (&otermios_rec, &termios_rec, sizeof (struct termios));
 363
 364       /* Set RAW mode, with no echo */
 365       termios_rec.c_lflag = termios_rec.c_lflag & ~ICANON & ~ECHO;
 366
 367 #if defined(linux) || defined (sun) || defined (sgi) || defined (__EMX__) \
 368     || defined (__osf__) || defined (__MACHTEN__) || defined (__hpux__) \
 369     || defined (_AIX) || (defined (__svr4__) && defined (i386)) \
 370     || defined (__Lynx__) || defined (__FreeBSD__)
 371       eof_ch = termios_rec.c_cc[VEOF];
 372
 373       /* If waiting (i.e. Get_Immediate (Char)), set MIN = 1 and wait for
 374          a character forever. This doesn't seem to effect Ctrl-Z or
 375          Ctrl-C processing except on OS/2 where Ctrl-C won't work right
 376          unless we do a read loop. Luckily we can delay a bit between
 377          iterations. If not waiting (i.e. Get_Immediate (Char, Available)),
 378          don't wait for anything but timeout immediately. */
 379 #ifdef __EMX__
 380       termios_rec.c_cc[VMIN] = 0;
 381       termios_rec.c_cc[VTIME] = waiting;
 382 #else
 383       termios_rec.c_cc[VMIN] = waiting;
 384       termios_rec.c_cc[VTIME] = 0;
 385 #endif
 386 #endif
 387       tcsetattr (fd, TCSANOW, &termios_rec);
 388
 389       while (! good_one)
 390         {
 391           /* Read is used here instead of fread, because fread doesn't
 392              work on Solaris5 and Sunos4 in this situation.  Maybe because we
 393              are mixing calls that use file descriptors and streams. */
 394           nread = read (fd, &c, 1);
 395           if (nread > 0)
 396             {
 397               /* On Unix terminals, Ctrl-D (EOT) is an End of File. */
 398               if (c == eof_ch)
 399                 {
 400                   *avail = 0;
 401                   *end_of_file = 1;
 402                   good_one = 1;
 403                 }
 404
 405               /* Everything else is ok */
 406               else if (c != eof_ch)
 407                 {
 408                   *avail = 1;
 409                   *end_of_file = 0;
 410                   good_one = 1;
 411                 }
 412             }
 413
 414           else if (! waiting)
 415             {
 416               *avail = 0;
 417               *end_of_file = 0;
 418               good_one = 1;
 419             }
 420           else
 421             good_one = 0;
 422         }
 423
 424       tcsetattr (fd, TCSANOW, &otermios_rec);
 425       *ch = c;
 426     }
 427
 428   else
 429 #elif defined (VMS)
 430   int fd = fileno (stream);
 431
 432   if (isatty (fd))
 433     {
 434       if (initted == 0)
 435         {
 436           decc$bsd_initscr ();
 437           initted = 1;
 438         }
 439
 440       decc$bsd_cbreak ();
 441       *ch = decc$bsd_wgetch (decc$ga_stdscr);
 442
 443       if (*ch == 4)
 444         *end_of_file = 1;
 445       else
 446         *end_of_file = 0;
 447
 448       *avail = 1;
 449       decc$bsd_nocbreak ();
 450     }
 451   else
 452 #elif defined (__MINGW32__)
 453   int fd = fileno (stream);
 454   int char_waiting;
 455   int eot_ch = 4; /* Ctrl-D */
 456
 457   if (isatty (fd))
 458     {
 459       if (waiting)
 460         {
 461           *ch = getch ();
 462           (*winflush_function) ();
 463
 464           if (*ch == eot_ch)
 465             *end_of_file = 1;
 466           else
 467             *end_of_file = 0;
 468
 469           *avail = 1;
 470         }
 471       else /* ! waiting */
 472         {
 473           char_waiting = kbhit();
 474
 475           if (char_waiting == 1)
 476             {
 477               *avail = 1;
 478               *ch = getch ();
 479               (*winflush_function) ();
 480
 481               if (*ch == eot_ch)
 482                 *end_of_file = 1;
 483               else
 484                 *end_of_file = 0;
 485             }
 486           else
 487             {
 488               *avail = 0;
 489               *end_of_file = 0;
 490             }
 491         }
 492     }
 493   else
 494 #elif defined (__vxworks)
 495   /* Bit masks of file descriptors to read from.  */
 496   struct fd_set readFds;
 497   /* Timeout before select returns if nothing can be read.  */
 498   struct timeval timeOut;
 499   char c;
 500   int fd = fileno (stream);
 501   int nread;
 502   int option;
 503   int readable;
 504   int status;
 505   int width;
 506
 507   if (isatty (fd))
 508     {
 509       /* If we do not want to wait, we have to set up fd in RAW mode. This
 510          should be done outside this function as setting fd in RAW mode under
 511          vxWorks flushes the buffer of fd. If the RAW mode was set here, the
 512          buffer would be empty and we would always return that no character
 513          is available */
 514       if (! waiting)
 515         {
 516           /* Initialization of timeOut for its use with select.  */
 517           timeOut.tv_sec  = 0;
 518           timeOut.tv_usec = 0;
 519
 520           /* Initialization of readFds for its use with select;
 521              FD is the only file descriptor to be monitored */
 522           FD_ZERO (&readFds);
 523           FD_SET (fd, &readFds);
 524           width = 2;
 525
 526           /* We do all this processing to emulate a non blocking read.  */
 527           readable = select (width, &readFds, NULL, NULL, &timeOut);
 528           if (readable == ERROR)
 529             *avail = -1, *end_of_file = -1;
 530           /* No character available in input.  */
 531           else if (readable == 0)
 532             *avail = 0, *end_of_file = 0;
 533           else
 534             {
 535               nread = read (fd, &c, 1);
 536               if (nread > 0)
 537                 *avail = 1, *end_of_file = 0;
 538               /* End Of File. */
 539               else if (nread == 0)
 540                 *avail = 0, *end_of_file = 1;
 541               /* Error.  */
 542               else
 543                 *avail = -1, *end_of_file = -1;
 544             }
 545         }
 546
 547       /* We have to wait until we get a character */
 548       else
 549         {
 550           *avail = -1;
 551           *end_of_file = -1;
 552
 553           /* Save the current mode of FD.  */
 554           option = ioctl (fd, FIOGETOPTIONS, 0);
 555
 556           /* Set FD in RAW mode.  */
 557           status = ioctl (fd, FIOSETOPTIONS, OPT_RAW);
 558           if (status != -1)
 559             {
 560               nread = read (fd, &c, 1);
 561               if (nread > 0)
 562                 *avail = 1, *end_of_file = 0;
 563               /* End of file.  */
 564               else if (nread == 0)
 565                 *avail = 0, *end_of_file = 1;
 566               /* Else there is an ERROR.  */
 567             }
 568
 569           /* Revert FD to its previous mode. */
 570           status = ioctl (fd, FIOSETOPTIONS, option);
 571         }
 572
 573       *ch = c;
 574     }
 575   else
 576 #endif
 577     {
 578       /* If we're not on a terminal, then we don't need any fancy processing.
 579          Also this is the only thing that's left if we're not on one of the
 580          supported systems; which means that for non supported systems,
 581          get_immediate may wait for a carriage return on terminals. */
 582       *ch = fgetc (stream);
 583       if (feof (stream))
 584         {
 585           *end_of_file = 1;
 586           *avail = 0;
 587         }
 588       else
 589         {
 590           *end_of_file = 0;
 591           *avail = 1;
 592         }
 593     }
 594 }
 595
 596 /* The following definitions are provided in NT to support Windows based
 597    Ada programs.  */
 598
 599 #ifdef WINNT
 600 #include <windows.h>
 601
 602 /* Provide functions to echo the values passed to WinMain (windows bindings
 603    will want to import these).  We use the same names as the routines used
 604    by AdaMagic for compatibility.  */
 605
 606 char *rts_get_hInstance (void);
 607 char *rts_get_hPrevInstance (void);
 608 char *rts_get_lpCommandLine (void);
 609 int   rts_get_nShowCmd (void);
 610
 611 char *
 612 rts_get_hInstance (void)
 613 {
 614   return (char *)GetModuleHandleA (0);
 615 }
 616
 617 char *
 618 rts_get_hPrevInstance (void)
 619 {
 620   return 0;
 621 }
 622
 623 char *
 624 rts_get_lpCommandLine (void)
 625 {
 626   return GetCommandLineA ();
 627 }
 628
 629 int
 630 rts_get_nShowCmd (void)
 631 {
 632   return 1;
 633 }
 634
 635 #endif /* WINNT */
 636 #ifdef VMS
 637
 638 /* This gets around a problem with using the old threads library on VMS 7.0. */
 639
 640 #include <time.h>
 641
 642 extern long get_gmtoff (void);
 643
 644 long
 645 get_gmtoff (void)
 646 {
 647   time_t t;
 648   struct tm *ts;
 649
 650   t = time ((time_t) 0);
 651   ts = localtime (&t);
 652   return ts->tm_gmtoff;
 653 }
 654 #endif
 655
 656 /* Definition of __gnat_locatime_r used by a-calend.adb */
 657
 658 #if defined (_AIX) || defined (__EMX__)
 659 #define Lock_Task system__soft_links__lock_task
 660 extern void (*Lock_Task) (void);
 661
 662 #define Unlock_Task system__soft_links__unlock_task
 663 extern void (*Unlock_Task) (void);
 664
 665 /* Provide reentrant version of localtime on Aix and OS/2. Note that AiX does
 666    provide localtime_r, but in the library libc_r which doesn't get included
 667    systematically, so we can't use it. */
 668
 669 extern struct tm *__gnat_localtime_r (const time_t *, struct tm *);
 670
 671 struct tm *
 672 __gnat_localtime_r (const time_t *timer, struct tm *tp)
 673 {
 674   struct tm *tmp;
 675
 676   (*Lock_Task) ();
 677   tmp = localtime (timer);
 678   memcpy (tp, tmp, sizeof (struct tm));
 679   (*Unlock_Task) ();
 680   return tp;
 681 }
 682
 683 #else
 684 #if defined (__Lynx__) && defined (___THREADS_POSIX4ad4__)
 685
 686 /* As of LynxOS 3.1.0a patch level 040, LynuxWorks changes the
 687    prototype to the C library function localtime_r from the POSIX.4
 688    Draft 9 to the POSIX 1.c version. Before this change the following
 689    spec is required. Only use when ___THREADS_POSIX4ad4__ is defined,
 690    the Lynx convention when building against the legacy API. */
 691
 692 extern struct tm *__gnat_localtime_r (const time_t *, struct tm *);
 693
 694 struct tm *
 695 __gnat_localtime_r (const time_t *timer, struct tm *tp)
 696 {
 697   localtime_r (tp, timer);
 698   return NULL;
 699 }
 700
 701 #else
 702 #if defined (VMS) || defined (__MINGW32__)
 703
 704 /* __gnat_localtime_r is not needed on NT and VMS */
 705
 706 #else
 707
 708 /* All other targets provide a standard localtime_r */
 709
 710 extern struct tm *__gnat_localtime_r (const time_t *, struct tm *);
 711
 712 struct tm *
 713 __gnat_localtime_r (const time_t *timer, struct tm *tp)
 714 {
 715   return (struct tm *) localtime_r (timer, tp);
 716 }
 717 #endif
 718 #endif
 719 #endif