1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2010, 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 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. *
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. *
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/>. *
27 * GNAT was originally developed by the GNAT team at New York University. *
28 * Extensive contributions were provided by Ada Core Technologies Inc. *
30 ****************************************************************************/
32 /* This file contains system dependent symbols that are referenced in the
33 GNAT Run Time Library */
37 #if ! defined (VTHREADS)
40 #if ! defined (__RTP__) && (! defined (VTHREADS) || defined (__VXWORKSMILS__))
43 #include "selectLib.h"
64 #if defined (sun) && defined (__SVR4) && !defined (__vxworks)
65 /* The declaration is present in <time.h> but conditionalized
66 on a couple of macros we don't define. */
67 extern struct tm *localtime_r(const time_t *, struct tm *);
74 open text file for reading
75 rt for DOS and Windows NT, r for Unix
78 truncate to zero length or create text file for writing
79 wt for DOS and Windows NT, w for Unix
82 append; open or create text file for writing at end-of-file
83 at for DOS and Windows NT, a for Unix
86 open binary file for reading
87 rb for DOS and Windows NT, r for Unix
90 truncate to zero length or create binary file for writing
91 wb for DOS and Windows NT, w for Unix
94 append; open or create binary file for writing at end-of-file
95 ab for DOS and Windows NT, a for Unix
98 open text file for update (reading and writing)
99 r+t for DOS and Windows NT, r+ for Unix
102 truncate to zero length or create text file for update
103 w+t for DOS and Windows NT, w+ for Unix
105 mode_append_text_plus
106 append; open or create text file for update, writing at end-of-file
107 a+t for DOS and Windows NT, a+ for Unix
109 mode_read_binary_plus
110 open binary file for update (reading and writing)
111 r+b for DOS and Windows NT, r+ for Unix
113 mode_write_binary_plus
114 truncate to zero length or create binary file for update
115 w+b for DOS and Windows NT, w+ for Unix
117 mode_append_binary_plus
118 append; open or create binary file for update, writing at end-of-file
119 a+b for DOS and Windows NT, a+ for Unix
123 (1) Opening a file with read mode fails if the file does not exist or
126 (2) Opening a file with append mode causes all subsequent writes to the
127 file to be forced to the then current end-of-file, regardless of
128 intervening calls to the fseek function.
130 (3) When a file is opened with update mode, both input and output may be
131 performed on the associated stream. However, output may not be directly
132 followed by input without an intervening call to the fflush function or
133 to a file positioning function (fseek, fsetpos, or rewind), and input
134 may not be directly followed by output without an intervening call to a
135 file positioning function, unless the input operation encounters
138 The other target dependent declarations here are for the two functions
139 __gnat_set_binary_mode and __gnat_set_text_mode:
141 void __gnat_set_binary_mode (int handle);
142 void __gnat_set_text_mode (int handle);
144 These functions have no effect in Unix (or similar systems where there is
145 no distinction between binary and text files), but in DOS (and similar
146 systems where text mode does CR/LF translation), these functions allow
147 the mode of the stream with the given handle (fileno can be used to get
148 the handle of a stream) to be changed dynamically. The returned result
149 is 0 if no error occurs and -1 if an error occurs.
151 Finally there is a boolean (character) variable
153 char __gnat_text_translation_required;
155 which is zero (false) in Unix mode, and one (true) in DOS mode, with a
156 true value indicating that text translation is required on text files
157 and that fopen supports the trailing t and b modifiers.
162 static const char *mode_read_text = "rt";
163 static const char *mode_write_text = "wt";
164 static const char *mode_append_text = "at";
165 static const char *mode_read_binary = "rb";
166 static const char *mode_write_binary = "wb";
167 static const char *mode_append_binary = "ab";
168 static const char *mode_read_text_plus = "r+t";
169 static const char *mode_write_text_plus = "w+t";
170 static const char *mode_append_text_plus = "a+t";
171 static const char *mode_read_binary_plus = "r+b";
172 static const char *mode_write_binary_plus = "w+b";
173 static const char *mode_append_binary_plus = "a+b";
174 const char __gnat_text_translation_required = 1;
177 __gnat_set_binary_mode (int handle)
179 _setmode (handle, O_BINARY);
183 __gnat_set_text_mode (int handle)
185 _setmode (handle, O_TEXT);
191 /* Return the name of the tty. Under windows there is no name for
192 the tty, so this function, if connected to a tty, returns the generic name
196 __gnat_ttyname (int filedes)
198 if (isatty (filedes))
204 /* This function is needed to fix a bug under Win95/98. Under these platforms
209 will put the same character into ch1 and ch2. It seem that the character
210 read by getch() is not correctly removed from the buffer. Even a
211 fflush(stdin) does not fix the bug. This bug does not appear under Window
212 NT. So we have two version of this routine below one for 95/98 and one for
213 NT/2000 version of Windows. There is also a special routine (winflushinit)
214 that will be called only the first time to check which version of Windows
215 we are running running on to set the right routine to use.
217 This problem occurs when using Text_IO.Get_Line after Text_IO.Get_Immediate
220 Calling FlushConsoleInputBuffer just after getch() fix the bug under
225 static void winflush_nt (void);
227 /* winflush_function will do nothing since we only have problems with Windows
228 95/98 which are not supported by RTX. */
230 static void (*winflush_function) (void) = winflush_nt;
235 /* Does nothing as there is no problem under NT. */
240 static void winflush_init (void);
242 static void winflush_95 (void);
244 static void winflush_nt (void);
246 int __gnat_is_windows_xp (void);
248 /* winflusfunction is set first to the winflushinit function which will check
249 the OS version 95/98 or NT/2000 */
251 static void (*winflush_function) (void) = winflush_init;
253 /* This function does the runtime check of the OS version and then sets
254 winflush_function to the appropriate function and then call it. */
259 DWORD dwVersion = GetVersion();
261 if (dwVersion < 0x80000000) /* Windows NT/2000 */
262 winflush_function = winflush_nt;
263 else /* Windows 95/98 */
264 winflush_function = winflush_95;
266 (*winflush_function)(); /* Perform the 'flush' */
273 FlushConsoleInputBuffer (GetStdHandle (STD_INPUT_HANDLE));
279 /* Does nothing as there is no problem under NT. */
283 __gnat_is_windows_xp (void)
285 static int is_win_xp=0, is_win_xp_checked=0;
287 if (!is_win_xp_checked)
289 OSVERSIONINFO version;
291 is_win_xp_checked = 1;
293 memset (&version, 0, sizeof (version));
294 version.dwOSVersionInfoSize = sizeof (version);
296 is_win_xp = GetVersionEx (&version)
297 && version.dwPlatformId == VER_PLATFORM_WIN32_NT
298 && (version.dwMajorVersion > 5
299 || (version.dwMajorVersion == 5 && version.dwMinorVersion >= 1));
306 /* Get the bounds of the stack. The stack pointer is supposed to be
307 initialized to BASE when a thread is created and the stack can be extended
308 to LIMIT before reaching a guard page.
309 Note: for the main thread, the system automatically extend the stack, so
310 LIMIT is only the current limit. */
313 __gnat_get_stack_bounds (void **base, void **limit)
317 /* We know that the first field of the TEB is the TIB. */
318 tib = (NT_TIB *)NtCurrentTeb ();
320 *base = tib->StackBase;
321 *limit = tib->StackLimit;
324 #endif /* !__MINGW32__ */
328 static const char *mode_read_text = "r";
329 static const char *mode_write_text = "w";
330 static const char *mode_append_text = "a";
331 static const char *mode_read_binary = "r";
332 static const char *mode_write_binary = "w";
333 static const char *mode_append_binary = "a";
334 static const char *mode_read_text_plus = "r+";
335 static const char *mode_write_text_plus = "w+";
336 static const char *mode_append_text_plus = "a+";
337 static const char *mode_read_binary_plus = "r+";
338 static const char *mode_write_binary_plus = "w+";
339 static const char *mode_append_binary_plus = "a+";
340 const char __gnat_text_translation_required = 0;
342 /* These functions do nothing in non-DOS systems. */
345 __gnat_set_binary_mode (int handle ATTRIBUTE_UNUSED)
350 __gnat_set_text_mode (int handle ATTRIBUTE_UNUSED)
354 __gnat_ttyname (int filedes)
356 #if defined (__vxworks) || defined (__nucleus)
359 extern char *ttyname (int);
361 return ttyname (filedes);
362 #endif /* defined (__vxworks) || defined (__nucleus) */
366 #if defined (linux) || defined (sun) || defined (sgi) \
367 || (defined (__osf__) && ! defined (__alpha_vxworks)) || defined (WINNT) \
368 || defined (__MACHTEN__) || defined (__hpux__) || defined (_AIX) \
369 || (defined (__svr4__) && defined (i386)) || defined (__Lynx__) \
370 || defined (__CYGWIN__) || defined (__FreeBSD__) || defined (__OpenBSD__) \
371 || defined (__GLIBC__) || defined (__APPLE__)
377 #include <conio.h> /* for getch(), kbhit() */
385 extern char *decc$ga_stdscr;
386 static int initted = 0;
390 /* Implements the common processing for getc_immediate and
391 getc_immediate_nowait. */
393 extern void getc_immediate (FILE *, int *, int *);
394 extern void getc_immediate_nowait (FILE *, int *, int *, int *);
395 extern void getc_immediate_common (FILE *, int *, int *, int *, int);
397 /* Called by Get_Immediate (Foo); */
400 getc_immediate (FILE *stream, int *ch, int *end_of_file)
404 getc_immediate_common (stream, ch, end_of_file, &avail, 1);
407 /* Called by Get_Immediate (Foo, Available); */
410 getc_immediate_nowait (FILE *stream, int *ch, int *end_of_file, int *avail)
412 getc_immediate_common (stream, ch, end_of_file, avail, 0);
415 /* Called by getc_immediate () and getc_immediate_nowait () */
418 getc_immediate_common (FILE *stream,
424 #if defined (linux) || defined (sun) || defined (sgi) \
425 || (defined (__osf__) && ! defined (__alpha_vxworks)) \
426 || defined (__CYGWIN32__) || defined (__MACHTEN__) || defined (__hpux__) \
427 || defined (_AIX) || (defined (__svr4__) && defined (i386)) \
428 || defined (__Lynx__) || defined (__FreeBSD__) || defined (__OpenBSD__) \
429 || defined (__GLIBC__) || defined (__APPLE__)
433 int eof_ch = 4; /* Ctrl-D */
434 int fd = fileno (stream);
435 struct termios otermios_rec, termios_rec;
439 tcgetattr (fd, &termios_rec);
440 memcpy (&otermios_rec, &termios_rec, sizeof (struct termios));
442 /* Set RAW mode, with no echo */
443 termios_rec.c_lflag = termios_rec.c_lflag & ~ICANON & ~ECHO;
445 #if defined(linux) || defined (sun) || defined (sgi) \
446 || defined (__osf__) || defined (__MACHTEN__) || defined (__hpux__) \
447 || defined (_AIX) || (defined (__svr4__) && defined (i386)) \
448 || defined (__Lynx__) || defined (__FreeBSD__) || defined (__OpenBSD__) \
449 || defined (__GLIBC__) || defined (__APPLE__)
450 eof_ch = termios_rec.c_cc[VEOF];
452 /* If waiting (i.e. Get_Immediate (Char)), set MIN = 1 and wait for
453 a character forever. This doesn't seem to effect Ctrl-Z or
455 If not waiting (i.e. Get_Immediate (Char, Available)),
456 don't wait for anything but timeout immediately. */
457 termios_rec.c_cc[VMIN] = waiting;
458 termios_rec.c_cc[VTIME] = 0;
460 tcsetattr (fd, TCSANOW, &termios_rec);
464 /* Read is used here instead of fread, because fread doesn't
465 work on Solaris5 and Sunos4 in this situation. Maybe because we
466 are mixing calls that use file descriptors and streams. */
467 nread = read (fd, &c, 1);
470 /* On Unix terminals, Ctrl-D (EOT) is an End of File. */
478 /* Everything else is ok */
479 else if (c != eof_ch)
497 tcsetattr (fd, TCSANOW, &otermios_rec);
503 int fd = fileno (stream);
514 *ch = decc$bsd_wgetch (decc$ga_stdscr);
522 decc$bsd_nocbreak ();
525 #elif defined (__MINGW32__)
526 int fd = fileno (stream);
528 int eot_ch = 4; /* Ctrl-D */
535 (*winflush_function) ();
546 char_waiting = kbhit();
548 if (char_waiting == 1)
552 (*winflush_function) ();
567 #elif defined (__vxworks)
568 /* Bit masks of file descriptors to read from. */
569 struct fd_set readFds;
570 /* Timeout before select returns if nothing can be read. */
571 struct timeval timeOut;
573 int fd = fileno (stream);
582 /* If we do not want to wait, we have to set up fd in RAW mode. This
583 should be done outside this function as setting fd in RAW mode under
584 vxWorks flushes the buffer of fd. If the RAW mode was set here, the
585 buffer would be empty and we would always return that no character
589 /* Initialization of timeOut for its use with select. */
593 /* Initialization of readFds for its use with select;
594 FD is the only file descriptor to be monitored */
596 FD_SET (fd, &readFds);
599 /* We do all this processing to emulate a non blocking read. */
600 readable = select (width, &readFds, NULL, NULL, &timeOut);
601 if (readable == ERROR)
602 *avail = -1, *end_of_file = -1;
603 /* No character available in input. */
604 else if (readable == 0)
605 *avail = 0, *end_of_file = 0;
608 nread = read (fd, &c, 1);
610 *avail = 1, *end_of_file = 0;
613 *avail = 0, *end_of_file = 1;
616 *avail = -1, *end_of_file = -1;
620 /* We have to wait until we get a character */
626 /* Save the current mode of FD. */
627 option = ioctl (fd, FIOGETOPTIONS, 0);
629 /* Set FD in RAW mode. */
630 status = ioctl (fd, FIOSETOPTIONS, OPT_RAW);
633 nread = read (fd, &c, 1);
635 *avail = 1, *end_of_file = 0;
638 *avail = 0, *end_of_file = 1;
639 /* Else there is an ERROR. */
642 /* Revert FD to its previous mode. */
643 status = ioctl (fd, FIOSETOPTIONS, option);
651 /* If we're not on a terminal, then we don't need any fancy processing.
652 Also this is the only thing that's left if we're not on one of the
653 supported systems; which means that for non supported systems,
654 get_immediate may wait for a carriage return on terminals. */
655 *ch = fgetc (stream);
669 /* The following definitions are provided in NT to support Windows based
675 /* Provide functions to echo the values passed to WinMain (windows bindings
676 will want to import these). We use the same names as the routines used
677 by AdaMagic for compatibility. */
679 char *rts_get_hInstance (void);
680 char *rts_get_hPrevInstance (void);
681 char *rts_get_lpCommandLine (void);
682 int rts_get_nShowCmd (void);
685 rts_get_hInstance (void)
687 return (char *)GetModuleHandleA (0);
691 rts_get_hPrevInstance (void)
697 rts_get_lpCommandLine (void)
699 return GetCommandLineA ();
703 rts_get_nShowCmd (void)
711 /* This gets around a problem with using the old threads library on VMS 7.0. */
713 extern long get_gmtoff (void);
721 t = time ((time_t) 0);
723 return ts->tm_gmtoff;
727 /* This value is returned as the time zone offset when a valid value
728 cannot be determined. It is simply a bizarre value that will never
729 occur. It is 3 days plus 73 seconds (offset is in seconds). */
731 long __gnat_invalid_tzoff = 259273;
733 /* Definition of __gnat_localtime_r used by a-calend.adb */
735 #if defined (__MINGW32__)
739 /* For the Cert run times on native Windows we use dummy functions
740 for locking and unlocking tasks since we do not support multiple
741 threads on this configuration (Cert run time on native Windows). */
745 void (*Lock_Task) () = &dummy;
746 void (*Unlock_Task) () = &dummy;
750 #define Lock_Task system__soft_links__lock_task
751 extern void (*Lock_Task) (void);
753 #define Unlock_Task system__soft_links__unlock_task
754 extern void (*Unlock_Task) (void);
758 /* Reentrant localtime for Windows. */
761 __gnat_localtime_tzoff (const time_t *, long *);
763 static const unsigned long long w32_epoch_offset = 11644473600ULL;
765 __gnat_localtime_tzoff (const time_t *timer, long *off)
770 unsigned long long ull_time;
771 } utc_time, local_time;
773 SYSTEMTIME utc_sys_time, local_sys_time;
774 TIME_ZONE_INFORMATION tzi;
783 tzi_status = GetTimeZoneInformation (&tzi);
785 if (tzi_status == TIME_ZONE_ID_STANDARD)
786 /* The system is operating in the range covered by the StandardDate
788 *off = *off + tzi.StandardBias;
789 else if (tzi_status == TIME_ZONE_ID_DAYLIGHT)
790 /* The system is operating in the range covered by the DaylightDate
792 *off = *off + tzi.DaylightBias;
797 /* First convert unix time_t structure to windows FILETIME format. */
798 utc_time.ull_time = ((unsigned long long) *timer + w32_epoch_offset)
801 tzi_status = GetTimeZoneInformation (&tzi);
803 /* If GetTimeZoneInformation does not return a value between 0 and 2 then
804 it means that we were not able to retrieve timezone informations.
805 Note that we cannot use here FileTimeToLocalFileTime as Windows will use
806 in always in this case the current timezone setting. As suggested on
807 MSDN we use the following three system calls to get the right information.
808 Note also that starting with Windows Vista new functions are provided to
809 get timezone settings that depend on the year. We cannot use them as we
810 still support Windows XP and Windows 2003. */
811 status = (tzi_status >= 0 && tzi_status <= 2)
812 && FileTimeToSystemTime (&utc_time.ft_time, &utc_sys_time)
813 && SystemTimeToTzSpecificLocalTime (&tzi, &utc_sys_time, &local_sys_time)
814 && SystemTimeToFileTime (&local_sys_time, &local_time.ft_time);
817 /* An error occurs so return invalid_tzoff. */
818 *off = __gnat_invalid_tzoff;
820 if (local_time.ull_time > utc_time.ull_time)
821 *off = (long) ((local_time.ull_time - utc_time.ull_time) / 10000000ULL);
823 *off = - (long) ((utc_time.ull_time - local_time.ull_time) / 10000000ULL);
832 /* On Lynx, all time values are treated in GMT */
834 #if defined (__Lynx__)
836 /* As of LynxOS 3.1.0a patch level 040, LynuxWorks changes the
837 prototype to the C library function localtime_r from the POSIX.4
838 Draft 9 to the POSIX 1.c version. Before this change the following
839 spec is required. Only use when ___THREADS_POSIX4ad4__ is defined,
840 the Lynx convention when building against the legacy API. */
843 __gnat_localtime_tzoff (const time_t *, long *);
846 __gnat_localtime_tzoff (const time_t *timer, long *off)
853 /* VMS does not need __gnat_localtime_tzoff */
857 /* Other targets except Lynx, VMS and Windows provide a standard localtime_r */
861 #define Lock_Task system__soft_links__lock_task
862 extern void (*Lock_Task) (void);
864 #define Unlock_Task system__soft_links__unlock_task
865 extern void (*Unlock_Task) (void);
868 __gnat_localtime_tzoff (const time_t *, long *);
871 __gnat_localtime_tzoff (const time_t *timer, long *off)
875 /* AIX, HPUX, SGI Irix, Sun Solaris */
876 #if defined (_AIX) || defined (__hpux__) || defined (sgi) || defined (sun)
880 localtime_r (timer, &tp);
881 *off = (long) -timezone;
885 /* Correct the offset if Daylight Saving Time is in effect */
892 #elif defined (__vxworks)
897 localtime_r (timer, &tp);
899 /* Try to read the environment variable TIMEZONE. The variable may not have
900 been initialize, in that case return an offset of zero (0) for UTC. */
902 char *tz_str = getenv ("TIMEZONE");
904 if ((tz_str == NULL) || (*tz_str == '\0'))
908 char *tz_start, *tz_end;
910 /* The format of the data contained in TIMEZONE is N::U:S:E where N is the
911 name of the time zone, U are the minutes difference from UTC, S is the
912 start of DST in mmddhh and E is the end of DST in mmddhh. Extracting
913 the value of U involves setting two pointers, one at the beginning and
914 one at the end of the value. The end pointer is then set to null in
915 order to delimit a string slice for atol to process. */
917 tz_start = index (tz_str, ':') + 2;
918 tz_end = index (tz_start, ':');
921 /* The Ada layer expects an offset in seconds. Note that we must reverse
922 the sign of the result since west is positive and east is negative on
925 *off = -atol (tz_start) * 60;
927 /* Correct the offset if Daylight Saving Time is in effect */
936 /* Darwin, Free BSD, Linux, Tru64, where component tm_gmtoff is present in
939 #elif defined (__APPLE__) || defined (__FreeBSD__) || defined (linux) ||\
940 (defined (__alpha__) && defined (__osf__)) || defined (__GLIBC__)
942 localtime_r (timer, &tp);
946 /* Default: treat all time values in GMT */
962 /* __gnat_get_task_options is used by s-taprop.adb only for VxWorks. This
963 function returns the options to be set when creating a new task. It fetches
964 the options assigned to the current task (parent), so offering some user
965 level control over the options for a task hierarchy. It forces VX_FP_TASK
966 because it is almost always required. On processors with the SPE
967 category, VX_SPE_TASK is needed to enable the SPE. */
968 extern int __gnat_get_task_options (void);
971 __gnat_get_task_options (void)
975 /* Get the options for the task creator */
976 taskOptionsGet (taskIdSelf (), &options);
978 /* Force VX_FP_TASK because it is almost always required */
979 options |= VX_FP_TASK;
980 #if defined (__SPE__) && (! defined (__VXWORKSMILS__))
981 options |= VX_SPE_TASK;
984 /* Mask those bits that are not under user control */
985 #ifdef VX_USR_TASK_OPTIONS
986 return options & VX_USR_TASK_OPTIONS;
995 __gnat_is_file_not_found_error (int errno_val) {
999 /* In the case of VxWorks, we also have to take into account various
1000 * filesystem-specific variants of this error.
1002 #if ! defined (VTHREADS)
1003 case S_dosFsLib_FILE_NOT_FOUND:
1005 #if ! defined (__RTP__) && (! defined (VTHREADS) || defined (__VXWORKSMILS__))
1006 case S_nfsLib_NFSERR_NOENT: