1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2008, Free Software Foundation, Inc. *
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, 51 Franklin Street, Fifth Floor, *
20 * Boston, MA 02110-1301, USA. *
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. *
28 * GNAT was originally developed by the GNAT team at New York University. *
29 * Extensive contributions were provided by Ada Core Technologies Inc. *
31 ****************************************************************************/
33 /* This file contains system dependent symbols that are referenced in the
34 GNAT Run Time Library */
42 #include "selectLib.h"
63 #if defined (sun) && defined (__SVR4) && !defined (__vxworks)
64 /* The declaration is present in <time.h> but conditionalized
65 on a couple of macros we don't define. */
66 extern struct tm *localtime_r(const time_t *, struct tm *);
73 open text file for reading
74 rt for DOS and Windows NT, r for Unix
77 truncate to zero length or create text file for writing
78 wt for DOS and Windows NT, w for Unix
81 append; open or create text file for writing at end-of-file
82 at for DOS and Windows NT, a for Unix
85 open binary file for reading
86 rb for DOS and Windows NT, r for Unix
89 truncate to zero length or create binary file for writing
90 wb for DOS and Windows NT, w for Unix
93 append; open or create binary file for writing at end-of-file
94 ab for DOS and Windows NT, a for Unix
97 open text file for update (reading and writing)
98 r+t for DOS and Windows NT, r+ for Unix
101 truncate to zero length or create text file for update
102 w+t for DOS and Windows NT, w+ for Unix
104 mode_append_text_plus
105 append; open or create text file for update, writing at end-of-file
106 a+t for DOS and Windows NT, a+ for Unix
108 mode_read_binary_plus
109 open binary file for update (reading and writing)
110 r+b for DOS and Windows NT, r+ for Unix
112 mode_write_binary_plus
113 truncate to zero length or create binary file for update
114 w+b for DOS and Windows NT, w+ for Unix
116 mode_append_binary_plus
117 append; open or create binary file for update, writing at end-of-file
118 a+b for DOS and Windows NT, a+ for Unix
122 (1) Opening a file with read mode fails if the file does not exist or
125 (2) Opening a file with append mode causes all subsequent writes to the
126 file to be forced to the then current end-of-file, regardless of
127 intervening calls to the fseek function.
129 (3) When a file is opened with update mode, both input and output may be
130 performed on the associated stream. However, output may not be directly
131 followed by input without an intervening call to the fflush function or
132 to a file positioning function (fseek, fsetpos, or rewind), and input
133 may not be directly followed by output without an intervening call to a
134 file positioning function, unless the input operation encounters
137 The other target dependent declarations here are for the two functions
138 __gnat_set_binary_mode and __gnat_set_text_mode:
140 void __gnat_set_binary_mode (int handle);
141 void __gnat_set_text_mode (int handle);
143 These functions have no effect in Unix (or similar systems where there is
144 no distinction between binary and text files), but in DOS (and similar
145 systems where text mode does CR/LF translation), these functions allow
146 the mode of the stream with the given handle (fileno can be used to get
147 the handle of a stream) to be changed dynamically. The returned result
148 is 0 if no error occurs and -1 if an error occurs.
150 Finally there is a boolean (character) variable
152 char __gnat_text_translation_required;
154 which is zero (false) in Unix mode, and one (true) in DOS mode, with a
155 true value indicating that text translation is required on text files
156 and that fopen supports the trailing t and b modifiers.
160 #if defined(WINNT) || defined (MSDOS) || defined (__EMX__)
161 static const char *mode_read_text = "rt";
162 static const char *mode_write_text = "wt";
163 static const char *mode_append_text = "at";
164 static const char *mode_read_binary = "rb";
165 static const char *mode_write_binary = "wb";
166 static const char *mode_append_binary = "ab";
167 static const char *mode_read_text_plus = "r+t";
168 static const char *mode_write_text_plus = "w+t";
169 static const char *mode_append_text_plus = "a+t";
170 static const char *mode_read_binary_plus = "r+b";
171 static const char *mode_write_binary_plus = "w+b";
172 static const char *mode_append_binary_plus = "a+b";
173 const char __gnat_text_translation_required = 1;
176 __gnat_set_binary_mode (int handle)
178 _setmode (handle, O_BINARY);
182 __gnat_set_text_mode (int handle)
184 _setmode (handle, O_TEXT);
190 /* Return the name of the tty. Under windows there is no name for
191 the tty, so this function, if connected to a tty, returns the generic name
195 __gnat_ttyname (int filedes)
197 if (isatty (filedes))
203 /* This function is needed to fix a bug under Win95/98. Under these platforms
208 will put the same character into ch1 and ch2. It seem that the character
209 read by getch() is not correctly removed from the buffer. Even a
210 fflush(stdin) does not fix the bug. This bug does not appear under Window
211 NT. So we have two version of this routine below one for 95/98 and one for
212 NT/2000 version of Windows. There is also a special routine (winflushinit)
213 that will be called only the first time to check which version of Windows
214 we are running running on to set the right routine to use.
216 This problem occurs when using Text_IO.Get_Line after Text_IO.Get_Immediate
219 Calling FlushConsoleInputBuffer just after getch() fix the bug under
224 static void winflush_nt (void);
226 /* winflush_function will do nothing since we only have problems with Windows
227 95/98 which are not supported by RTX. */
229 static void (*winflush_function) (void) = winflush_nt;
234 /* Does nothing as there is no problem under NT. */
239 static void winflush_init (void);
241 static void winflush_95 (void);
243 static void winflush_nt (void);
245 int __gnat_is_windows_xp (void);
247 /* winflusfunction is set first to the winflushinit function which will check
248 the OS version 95/98 or NT/2000 */
250 static void (*winflush_function) (void) = winflush_init;
252 /* This function does the runtime check of the OS version and then sets
253 winflush_function to the appropriate function and then call it. */
258 DWORD dwVersion = GetVersion();
260 if (dwVersion < 0x80000000) /* Windows NT/2000 */
261 winflush_function = winflush_nt;
262 else /* Windows 95/98 */
263 winflush_function = winflush_95;
265 (*winflush_function)(); /* Perform the 'flush' */
272 FlushConsoleInputBuffer (GetStdHandle (STD_INPUT_HANDLE));
278 /* Does nothing as there is no problem under NT. */
282 __gnat_is_windows_xp (void)
284 static int is_win_xp=0, is_win_xp_checked=0;
286 if (!is_win_xp_checked)
288 OSVERSIONINFO version;
290 is_win_xp_checked = 1;
292 memset (&version, 0, sizeof (version));
293 version.dwOSVersionInfoSize = sizeof (version);
295 is_win_xp = GetVersionEx (&version)
296 && version.dwPlatformId == VER_PLATFORM_WIN32_NT
297 && (version.dwMajorVersion > 5
298 || (version.dwMajorVersion == 5 && version.dwMinorVersion >= 1));
309 static const char *mode_read_text = "r";
310 static const char *mode_write_text = "w";
311 static const char *mode_append_text = "a";
312 static const char *mode_read_binary = "r";
313 static const char *mode_write_binary = "w";
314 static const char *mode_append_binary = "a";
315 static const char *mode_read_text_plus = "r+";
316 static const char *mode_write_text_plus = "w+";
317 static const char *mode_append_text_plus = "a+";
318 static const char *mode_read_binary_plus = "r+";
319 static const char *mode_write_binary_plus = "w+";
320 static const char *mode_append_binary_plus = "a+";
321 const char __gnat_text_translation_required = 0;
323 /* These functions do nothing in non-DOS systems. */
326 __gnat_set_binary_mode (int handle ATTRIBUTE_UNUSED)
331 __gnat_set_text_mode (int handle ATTRIBUTE_UNUSED)
335 __gnat_ttyname (int filedes)
337 #if defined (__vxworks) || defined (__nucleus)
340 extern char *ttyname (int);
342 return ttyname (filedes);
343 #endif /* defined (__vxworks) || defined (__nucleus) */
347 #if defined (linux) || defined (sun) || defined (sgi) || defined (__EMX__) \
348 || (defined (__osf__) && ! defined (__alpha_vxworks)) || defined (WINNT) \
349 || defined (__MACHTEN__) || defined (__hpux__) || defined (_AIX) \
350 || (defined (__svr4__) && defined (i386)) || defined (__Lynx__) \
351 || defined (__CYGWIN__) || defined (__FreeBSD__) || defined (__OpenBSD__) \
352 || defined (__GLIBC__)
358 #include <conio.h> /* for getch(), kbhit() */
366 extern char *decc$ga_stdscr;
367 static int initted = 0;
371 /* Implements the common processing for getc_immediate and
372 getc_immediate_nowait. */
374 extern void getc_immediate (FILE *, int *, int *);
375 extern void getc_immediate_nowait (FILE *, int *, int *, int *);
376 extern void getc_immediate_common (FILE *, int *, int *, int *, int);
378 /* Called by Get_Immediate (Foo); */
381 getc_immediate (FILE *stream, int *ch, int *end_of_file)
385 getc_immediate_common (stream, ch, end_of_file, &avail, 1);
388 /* Called by Get_Immediate (Foo, Available); */
391 getc_immediate_nowait (FILE *stream, int *ch, int *end_of_file, int *avail)
393 getc_immediate_common (stream, ch, end_of_file, avail, 0);
396 /* Called by getc_immediate () and getc_immediate_nowait () */
399 getc_immediate_common (FILE *stream,
405 #if defined (linux) || defined (sun) || defined (sgi) || defined (__EMX__) \
406 || (defined (__osf__) && ! defined (__alpha_vxworks)) \
407 || defined (__CYGWIN32__) || defined (__MACHTEN__) || defined (__hpux__) \
408 || defined (_AIX) || (defined (__svr4__) && defined (i386)) \
409 || defined (__Lynx__) || defined (__FreeBSD__) || defined (__OpenBSD__) \
410 || defined (__GLIBC__)
414 int eof_ch = 4; /* Ctrl-D */
415 int fd = fileno (stream);
416 struct termios otermios_rec, termios_rec;
420 tcgetattr (fd, &termios_rec);
421 memcpy (&otermios_rec, &termios_rec, sizeof (struct termios));
423 /* Set RAW mode, with no echo */
424 termios_rec.c_lflag = termios_rec.c_lflag & ~ICANON & ~ECHO;
426 #if defined(linux) || defined (sun) || defined (sgi) || defined (__EMX__) \
427 || defined (__osf__) || defined (__MACHTEN__) || defined (__hpux__) \
428 || defined (_AIX) || (defined (__svr4__) && defined (i386)) \
429 || defined (__Lynx__) || defined (__FreeBSD__) || defined (__OpenBSD__) \
430 || defined (__GLIBC__)
431 eof_ch = termios_rec.c_cc[VEOF];
433 /* If waiting (i.e. Get_Immediate (Char)), set MIN = 1 and wait for
434 a character forever. This doesn't seem to effect Ctrl-Z or
435 Ctrl-C processing except on OS/2 where Ctrl-C won't work right
436 unless we do a read loop. Luckily we can delay a bit between
437 iterations. If not waiting (i.e. Get_Immediate (Char, Available)),
438 don't wait for anything but timeout immediately. */
440 termios_rec.c_cc[VMIN] = 0;
441 termios_rec.c_cc[VTIME] = waiting;
443 termios_rec.c_cc[VMIN] = waiting;
444 termios_rec.c_cc[VTIME] = 0;
447 tcsetattr (fd, TCSANOW, &termios_rec);
451 /* Read is used here instead of fread, because fread doesn't
452 work on Solaris5 and Sunos4 in this situation. Maybe because we
453 are mixing calls that use file descriptors and streams. */
454 nread = read (fd, &c, 1);
457 /* On Unix terminals, Ctrl-D (EOT) is an End of File. */
465 /* Everything else is ok */
466 else if (c != eof_ch)
484 tcsetattr (fd, TCSANOW, &otermios_rec);
490 int fd = fileno (stream);
501 *ch = decc$bsd_wgetch (decc$ga_stdscr);
509 decc$bsd_nocbreak ();
512 #elif defined (__MINGW32__)
513 int fd = fileno (stream);
515 int eot_ch = 4; /* Ctrl-D */
522 (*winflush_function) ();
533 char_waiting = kbhit();
535 if (char_waiting == 1)
539 (*winflush_function) ();
554 #elif defined (__vxworks)
555 /* Bit masks of file descriptors to read from. */
556 struct fd_set readFds;
557 /* Timeout before select returns if nothing can be read. */
558 struct timeval timeOut;
560 int fd = fileno (stream);
569 /* If we do not want to wait, we have to set up fd in RAW mode. This
570 should be done outside this function as setting fd in RAW mode under
571 vxWorks flushes the buffer of fd. If the RAW mode was set here, the
572 buffer would be empty and we would always return that no character
576 /* Initialization of timeOut for its use with select. */
580 /* Initialization of readFds for its use with select;
581 FD is the only file descriptor to be monitored */
583 FD_SET (fd, &readFds);
586 /* We do all this processing to emulate a non blocking read. */
587 readable = select (width, &readFds, NULL, NULL, &timeOut);
588 if (readable == ERROR)
589 *avail = -1, *end_of_file = -1;
590 /* No character available in input. */
591 else if (readable == 0)
592 *avail = 0, *end_of_file = 0;
595 nread = read (fd, &c, 1);
597 *avail = 1, *end_of_file = 0;
600 *avail = 0, *end_of_file = 1;
603 *avail = -1, *end_of_file = -1;
607 /* We have to wait until we get a character */
613 /* Save the current mode of FD. */
614 option = ioctl (fd, FIOGETOPTIONS, 0);
616 /* Set FD in RAW mode. */
617 status = ioctl (fd, FIOSETOPTIONS, OPT_RAW);
620 nread = read (fd, &c, 1);
622 *avail = 1, *end_of_file = 0;
625 *avail = 0, *end_of_file = 1;
626 /* Else there is an ERROR. */
629 /* Revert FD to its previous mode. */
630 status = ioctl (fd, FIOSETOPTIONS, option);
638 /* If we're not on a terminal, then we don't need any fancy processing.
639 Also this is the only thing that's left if we're not on one of the
640 supported systems; which means that for non supported systems,
641 get_immediate may wait for a carriage return on terminals. */
642 *ch = fgetc (stream);
656 /* The following definitions are provided in NT to support Windows based
662 /* Provide functions to echo the values passed to WinMain (windows bindings
663 will want to import these). We use the same names as the routines used
664 by AdaMagic for compatibility. */
666 char *rts_get_hInstance (void);
667 char *rts_get_hPrevInstance (void);
668 char *rts_get_lpCommandLine (void);
669 int rts_get_nShowCmd (void);
672 rts_get_hInstance (void)
674 return (char *)GetModuleHandleA (0);
678 rts_get_hPrevInstance (void)
684 rts_get_lpCommandLine (void)
686 return GetCommandLineA ();
690 rts_get_nShowCmd (void)
698 /* This gets around a problem with using the old threads library on VMS 7.0. */
700 extern long get_gmtoff (void);
708 t = time ((time_t) 0);
710 return ts->tm_gmtoff;
714 /* This value is returned as the time zone offset when a valid value
715 cannot be determined. It is simply a bizarre value that will never
716 occur. It is 3 days plus 73 seconds (offset is in seconds). */
718 long __gnat_invalid_tzoff = 259273;
720 /* Definition of __gnat_localtime_r used by a-calend.adb */
722 #if defined (__EMX__) || defined (__MINGW32__)
726 /* For the Cert run times on native Windows we use dummy functions
727 for locking and unlocking tasks since we do not support multiple
728 threads on this configuration (Cert run time on native Windows). */
732 void (*Lock_Task) () = &dummy;
733 void (*Unlock_Task) () = &dummy;
737 #define Lock_Task system__soft_links__lock_task
738 extern void (*Lock_Task) (void);
740 #define Unlock_Task system__soft_links__unlock_task
741 extern void (*Unlock_Task) (void);
745 /* Reentrant localtime for Windows and OS/2. */
748 __gnat_localtime_tzoff (const time_t *, struct tm *, long *);
751 __gnat_localtime_tzoff (const time_t *timer, struct tm *tp, long *off)
755 TIME_ZONE_INFORMATION tzi;
758 tmp = localtime (timer);
759 memcpy (tp, tmp, sizeof (struct tm));
760 dwRet = GetTimeZoneInformation (&tzi);
762 if (tp->tm_isdst > 0)
763 *off = *off + tzi.DaylightBias;
770 #if defined (__Lynx__) && defined (___THREADS_POSIX4ad4__)
772 /* As of LynxOS 3.1.0a patch level 040, LynuxWorks changes the
773 prototype to the C library function localtime_r from the POSIX.4
774 Draft 9 to the POSIX 1.c version. Before this change the following
775 spec is required. Only use when ___THREADS_POSIX4ad4__ is defined,
776 the Lynx convention when building against the legacy API. */
779 __gnat_localtime_tzoff (const time_t *, struct tm *, long *);
782 __gnat_localtime_tzoff (const time_t *timer, struct tm *tp, long *off)
784 /* Treat all time values in GMT */
785 localtime_r (tp, timer);
793 /* __gnat_localtime_tzoff is not needed on VMS */
797 /* All other targets provide a standard localtime_r */
800 __gnat_localtime_tzoff (const time_t *, struct tm *, long *);
803 __gnat_localtime_tzoff (const time_t *timer, struct tm *tp, long *off)
805 localtime_r (timer, tp);
807 /* AIX, HPUX, SGI Irix, Sun Solaris */
808 #if defined (_AIX) || defined (__hpux__) || defined (sgi) || defined (sun)
809 /* The contents of external variable "timezone" may not always be
810 initialized. Instead of returning an incorrect offset, treat the local
811 time zone as 0 (UTC). The value of 28 hours is the maximum valid offset
812 allowed by Ada.Calendar.Time_Zones. */
813 if ((timezone < -28 * 3600) || (timezone > 28 * 3600))
817 *off = (long) -timezone;
818 if (tp->tm_isdst > 0)
821 /* Lynx - Treat all time values in GMT */
822 #elif defined (__Lynx__)
826 #elif defined (__vxworks)
829 /* Try to read the environment variable TIMEZONE. The variable may not have
830 been initialize, in that case return an offset of zero (0) for UTC. */
831 char *tz_str = getenv ("TIMEZONE");
833 if ((tz_str == NULL) || (*tz_str == '\0'))
837 char *tz_start, *tz_end;
839 /* The format of the data contained in TIMEZONE is N::U:S:E where N is the
840 name of the time zone, U are the minutes difference from UTC, S is the
841 start of DST in mmddhh and E is the end of DST in mmddhh. Extracting
842 the value of U involves setting two pointers, one at the beginning and
843 one at the end of the value. The end pointer is then set to null in
844 order to delimit a string slice for atol to process. */
845 tz_start = index (tz_str, ':') + 2;
846 tz_end = index (tz_start, ':');
849 /* The Ada layer expects an offset in seconds */
850 *off = atol (tz_start) * 60;
854 /* Darwin, Free BSD, Linux, Tru64, where there exists a component tm_gmtoff
856 #elif defined (__APPLE__) || defined (__FreeBSD__) || defined (linux) ||\
857 (defined (__alpha__) && defined (__osf__)) || defined (__GLIBC__)
858 *off = tp->tm_gmtoff;
860 /* All other platforms: Treat all time values in GMT */
875 /* __gnat_get_task_options is used by s-taprop.adb only for VxWorks. This
876 function returns the options to be set when creating a new task. It fetches
877 the options assigned to the current task (parent), so offering some user
878 level control over the options for a task hierarchy. It forces VX_FP_TASK
879 because it is almost always required. */
880 extern int __gnat_get_task_options (void);
883 __gnat_get_task_options (void)
887 /* Get the options for the task creator */
888 taskOptionsGet (taskIdSelf (), &options);
890 /* Force VX_FP_TASK because it is almost always required */
891 options |= VX_FP_TASK;
893 /* Mask those bits that are not under user control */
894 #ifdef VX_USR_TASK_OPTIONS
895 return options & VX_USR_TASK_OPTIONS;
904 __gnat_is_file_not_found_error (int errno_val) {
908 /* In the case of VxWorks, we also have to take into account various
909 * filesystem-specific variants of this error.
911 case S_dosFsLib_FILE_NOT_FOUND:
913 case S_nfsLib_NFSERR_NOENT: