reactos/lib/crtdll/misc/crt1.c

   1 /*
   2  * crt1.c
   3  *
   4  * Source code for the startup proceedures used by all programs. This code
   5  * is compiled to make crt0.o, which should be located in the library path.
   6  *
   7  * This code is part of the Mingw32 package.
   8  *
   9  * Contributors:
  10  *  Created by Colin Peters <colin@bird.fu.is.saga-u.ac.jp>
  11  *
  12  *  THIS SOFTWARE IS NOT COPYRIGHTED
  13  *
  14  *  This source code is offered for use in the public domain. You may
  15  *  use, modify or distribute it freely.
  16  *
  17  *  This code is distributed in the hope that it will be useful but
  18  *  WITHOUT ANY WARRANTY. ALL WARRENTIES, EXPRESS OR IMPLIED ARE HEREBY
  19  *  DISCLAMED. This includes but is not limited to warrenties of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  21  *
  22  * $Revision: 1.5 $
  23  * $Author$
  24  * $Date$
  25  *
  26  */
  27
  28 #include "precomp.h"
  29 #include <msvcrt/stdlib.h>
  30 #include <msvcrt/stdio.h>
  31 #include <msvcrt/io.h>
  32 #include <msvcrt/fcntl.h>
  33 #include <msvcrt/process.h>
  34 #include <msvcrt/float.h>
  35
  36
  37 /* NOTE: The code for initializing the _argv, _argc, and environ variables
  38  *       has been moved to a separate .c file which is included in both
  39  *       crt1.c and dllcrt1.c. This means changes in the code don't have to
  40  *       be manually synchronized, but it does lead to this not-generally-
  41  *       a-good-idea use of include. */
  42 #include "init.c"
  43
  44 extern int main(int, char**, char**);
  45
  46 /*
  47  * Setup the default file handles to have the _CRT_fmode mode, as well as
  48  * any new files created by the user.
  49  */
  50 extern unsigned int _CRT_fmode;
  51
  52 void
  53 _mingw32_init_fmode (void)
  54 {
  55         /* Don't set the file mode if the user hasn't set any value for it. */
  56         if (_CRT_fmode)
  57         {
  58                 _fmode = _CRT_fmode;
  59
  60                 /*
  61                  * This overrides the default file mode settings for stdin,
  62                  * stdout and stderr. At first I thought you would have to
  63                  * test with isatty, but it seems that the DOS console at
  64                  * least is smart enough to handle _O_BINARY stdout and
  65                  * still display correctly.
  66                  */
  67                 if (stdin)
  68                 {
  69                         _setmode (_fileno(stdin), _CRT_fmode);
  70                 }
  71                 if (stdout)
  72                 {
  73                         _setmode (_fileno(stdout), _CRT_fmode);
  74                 }
  75                 if (stderr)
  76                 {
  77                         _setmode (_fileno(stderr), _CRT_fmode);
  78                 }
  79         }
  80 }
  81
  82
  83 /*
  84  * The function mainCRTStartup is the entry point for all console programs.
  85  */
  86 int
  87 mainCRTStartup (void)
  88 {
  89         int     nRet;
  90
  91         /*
  92          * I have been told that this is the correct thing to do. You
  93          * have to uncomment the prototype of SetUnhandledExceptionFilter
  94          * in the GNU Win32 API headers for this to work. The type it
  95          * expects is a pointer to a function of the same type as
  96          * UnhandledExceptionFilter, which is prototyped just above
  97          * (see Functions.h).
  98          */
  99         //SetUnhandledExceptionFilter (NULL);
 100
 101         /*
 102          * Initialize floating point unit.
 103          */
 104         _fpreset ();    /* Supplied by the runtime library. */
 105
 106         /*
 107          * Set up __argc, __argv and _environ.
 108          */
 109         _mingw32_init_mainargs();
 110
 111         /*
 112          * Sets the default file mode for stdin, stdout and stderr, as well
 113          * as files later opened by the user, to _CRT_fmode.
 114          * NOTE: DLLs don't do this because that would be rude!
 115          */
 116         _mingw32_init_fmode();
 117
 118         /*
 119          * Call the main function. If the user does not supply one
 120          * the one in the 'libmingw32.a' library will be linked in, and
 121          * that one calls WinMain. See main.c in the 'lib' dir
 122          * for more details.
 123          */
 124         nRet = main(_argc, _argv, _environ);
 125
 126         /*
 127          * Perform exit processing for the C library. This means
 128          * flushing output and calling 'atexit' registered functions.
 129          */
 130         _cexit();
 131
 132         ExitProcess (nRet);
 133
 134         return 0;
 135 }
 136
 137 /*
 138  * For now the GUI startup function is the same as the console one.
 139  * This simply gets rid of the annoying warning about not being able
 140  * to find WinMainCRTStartup when linking GUI applications.
 141  */
 142 int
 143 WinMainCRTStartup (void)
 144 {
 145         return mainCRTStartup();
 146 }
 147
 148 /* With the EGCS build from Mumit Khan (or apparently b19 from Cygnus) this
 149  * is no longer necessary. */
 150 #ifdef __GNUC__
 151 /*
 152  * This section terminates the list of imports under GCC. If you do not
 153  * include this then you will have problems when linking with DLLs.
 154  *
 155  */
 156 asm (".section .idata$3\n" ".long 0,0,0,0,0,0,0,0");
 157 #endif
 158