270 lines
6.7 KiB
C
270 lines
6.7 KiB
C
/*
|
|
* crt1.c
|
|
*
|
|
* Source code for the startup proceedures used by all programs. This code
|
|
* is compiled to make crt1.o, which should be located in the library path.
|
|
*
|
|
* This code is part of the Mingw32 package.
|
|
*
|
|
* Contributors:
|
|
* Created by Colin Peters <colin@bird.fu.is.saga-u.ac.jp>
|
|
* Maintained by Mumit Khan <khan@xraylith.wisc.EDU>
|
|
*
|
|
* THIS SOFTWARE IS NOT COPYRIGHTED
|
|
*
|
|
* This source code is offered for use in the public domain. You may
|
|
* use, modify or distribute it freely.
|
|
*
|
|
* This code is distributed in the hope that it will be useful but
|
|
* WITHOUT ANY WARRANTY. ALL WARRENTIES, EXPRESS OR IMPLIED ARE HEREBY
|
|
* DISCLAMED. This includes but is not limited to warrenties of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
|
|
*
|
|
* $Revision$
|
|
* $Author$
|
|
* $Date$
|
|
*
|
|
*/
|
|
|
|
/* Hide the declaration of _fmode with dllimport attribute in stdlib.h.
|
|
This is not necessary with Mumit Khan's patches to gcc's winnt.c,
|
|
but those patches are still unofficial. */
|
|
|
|
#define __IN_MINGW_RUNTIME
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <io.h>
|
|
#include <process.h>
|
|
#include <float.h>
|
|
#define WIN32_LEAN_AND_MEAN
|
|
#include <windows.h>
|
|
#include <signal.h>
|
|
|
|
/* NOTE: The code for initializing the _argv, _argc, and environ variables
|
|
* has been moved to a separate .c file which is included in both
|
|
* crt1.c and dllcrt1.c. This means changes in the code don't have to
|
|
* be manually synchronized, but it does lead to this not-generally-
|
|
* a-good-idea use of include. */
|
|
#include "init.c"
|
|
|
|
extern int main (int, char **, char **);
|
|
|
|
/*
|
|
* Must have the correct app type for MSVCRT.
|
|
*/
|
|
|
|
#ifdef __MSVCRT__
|
|
#define __UNKNOWN_APP 0
|
|
#define __CONSOLE_APP 1
|
|
#define __GUI_APP 2
|
|
__MINGW_IMPORT void __set_app_type(int);
|
|
#endif /* __MSVCRT__ */
|
|
|
|
/* Global _fmode for this .exe, not the one in msvcrt.dll,
|
|
The default is set in txtmode.o in libmingw32.a */
|
|
/* Override the dllimport'd declarations in stdlib.h */
|
|
#undef _fmode
|
|
extern int _fmode;
|
|
extern int* __p__fmode(void); /* To access the dll _fmode */
|
|
|
|
/*
|
|
* Setup the default file handles to have the _CRT_fmode mode, as well as
|
|
* any new files created by the user.
|
|
*/
|
|
extern int _CRT_fmode;
|
|
|
|
static void
|
|
_mingw32_init_fmode ()
|
|
{
|
|
/* Don't set the std file mode if the user hasn't set any value for it. */
|
|
if (_CRT_fmode)
|
|
{
|
|
_fmode = _CRT_fmode;
|
|
|
|
/*
|
|
* This overrides the default file mode settings for stdin,
|
|
* stdout and stderr. At first I thought you would have to
|
|
* test with isatty, but it seems that the DOS console at
|
|
* least is smart enough to handle _O_BINARY stdout and
|
|
* still display correctly.
|
|
*/
|
|
if (stdin)
|
|
{
|
|
_setmode (_fileno (stdin), _CRT_fmode);
|
|
}
|
|
if (stdout)
|
|
{
|
|
_setmode (_fileno (stdout), _CRT_fmode);
|
|
}
|
|
if (stderr)
|
|
{
|
|
_setmode (_fileno (stderr), _CRT_fmode);
|
|
}
|
|
}
|
|
|
|
/* Now sync the dll _fmode to the one for this .exe. */
|
|
*__p__fmode() = _fmode;
|
|
|
|
}
|
|
|
|
/* This function will be called when a trap occurs. Thanks to Jacob
|
|
Navia for his contribution. */
|
|
static CALLBACK long
|
|
_gnu_exception_handler (EXCEPTION_POINTERS * exception_data)
|
|
{
|
|
void (*old_handler) (int);
|
|
long action = EXCEPTION_CONTINUE_SEARCH;
|
|
int reset_fpu = 0;
|
|
|
|
switch (exception_data->ExceptionRecord->ExceptionCode)
|
|
{
|
|
case EXCEPTION_ACCESS_VIOLATION:
|
|
/* test if the user has set SIGSEGV */
|
|
old_handler = signal (SIGSEGV, SIG_DFL);
|
|
if (old_handler == SIG_IGN)
|
|
{
|
|
/* this is undefined if the signal was raised by anything other
|
|
than raise (). */
|
|
signal (SIGSEGV, SIG_IGN);
|
|
action = EXCEPTION_CONTINUE_EXECUTION;
|
|
}
|
|
else if (old_handler != SIG_DFL)
|
|
{
|
|
/* This means 'old' is a user defined function. Call it */
|
|
(*old_handler) (SIGSEGV);
|
|
action = EXCEPTION_CONTINUE_EXECUTION;
|
|
}
|
|
break;
|
|
|
|
case EXCEPTION_FLT_INVALID_OPERATION:
|
|
case EXCEPTION_FLT_DIVIDE_BY_ZERO:
|
|
case EXCEPTION_FLT_DENORMAL_OPERAND:
|
|
case EXCEPTION_FLT_OVERFLOW:
|
|
case EXCEPTION_FLT_UNDERFLOW:
|
|
case EXCEPTION_FLT_INEXACT_RESULT:
|
|
reset_fpu = 1;
|
|
/* fall through. */
|
|
|
|
case EXCEPTION_INT_DIVIDE_BY_ZERO:
|
|
/* test if the user has set SIGFPE */
|
|
old_handler = signal (SIGFPE, SIG_DFL);
|
|
if (old_handler == SIG_IGN)
|
|
{
|
|
signal (SIGFPE, SIG_IGN);
|
|
if (reset_fpu)
|
|
_fpreset ();
|
|
action = EXCEPTION_CONTINUE_EXECUTION;
|
|
}
|
|
else if (old_handler != SIG_DFL)
|
|
{
|
|
/* This means 'old' is a user defined function. Call it */
|
|
(*old_handler) (SIGFPE);
|
|
action = EXCEPTION_CONTINUE_EXECUTION;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
return action;
|
|
}
|
|
|
|
/*
|
|
* The function mainCRTStartup is the entry point for all console programs.
|
|
*/
|
|
static int
|
|
__mingw_CRTStartup ()
|
|
{
|
|
int nRet;
|
|
|
|
/*
|
|
* Set up the top-level exception handler so that signal handling
|
|
* works as expected. The mapping between ANSI/POSIX signals and
|
|
* Win32 SE is not 1-to-1, so caveat emptore.
|
|
*
|
|
*/
|
|
SetUnhandledExceptionFilter (_gnu_exception_handler);
|
|
|
|
/*
|
|
* Initialize floating point unit.
|
|
*/
|
|
_fpreset (); /* Supplied by the runtime library. */
|
|
|
|
/*
|
|
* Set up __argc, __argv and _environ.
|
|
*/
|
|
_mingw32_init_mainargs ();
|
|
|
|
/*
|
|
* Sets the default file mode.
|
|
* If _CRT_fmode is set, also set mode for stdin, stdout
|
|
* and stderr, as well
|
|
* NOTE: DLLs don't do this because that would be rude!
|
|
*/
|
|
_mingw32_init_fmode ();
|
|
|
|
/*
|
|
* Call the main function. If the user does not supply one
|
|
* the one in the 'libmingw32.a' library will be linked in, and
|
|
* that one calls WinMain. See main.c in the 'lib' dir
|
|
* for more details.
|
|
*/
|
|
nRet = main (_argc, _argv, environ);
|
|
|
|
/*
|
|
* Perform exit processing for the C library. This means
|
|
* flushing output and calling 'atexit' registered functions.
|
|
*/
|
|
_cexit ();
|
|
|
|
ExitProcess (nRet);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The function mainCRTStartup is the entry point for all console programs.
|
|
*/
|
|
int
|
|
mainCRTStartup ()
|
|
{
|
|
#ifdef __MSVCRT__
|
|
__set_app_type (__CONSOLE_APP);
|
|
#endif
|
|
__mingw_CRTStartup ();
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* For now the GUI startup function is the same as the console one.
|
|
* This simply gets rid of the annoying warning about not being able
|
|
* to find WinMainCRTStartup when linking GUI applications.
|
|
*/
|
|
int
|
|
WinMainCRTStartup ()
|
|
{
|
|
#ifdef __MSVCRT__
|
|
__set_app_type (__GUI_APP);
|
|
#endif
|
|
__mingw_CRTStartup ();
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* We force use of library version of atexit, which is only
|
|
* visible in import lib as _imp__atexit
|
|
*/
|
|
extern int (*_imp__atexit)(void (*)(void));
|
|
int atexit (void (* pfn )(void) )
|
|
{
|
|
return ( (*_imp__atexit)(pfn));
|
|
}
|
|
|
|
/* Likewise for non-ANSI _onexit */
|
|
extern _onexit_t (*_imp___onexit)(_onexit_t);
|
|
_onexit_t
|
|
_onexit (_onexit_t pfn )
|
|
{
|
|
return (*_imp___onexit)(pfn);
|
|
}
|