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Diffstat (limited to 'winsup/mingw/crt1.c')
| -rw-r--r-- | winsup/mingw/crt1.c | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/winsup/mingw/crt1.c b/winsup/mingw/crt1.c new file mode 100644 index 000000000..f91f1da28 --- /dev/null +++ b/winsup/mingw/crt1.c @@ -0,0 +1,234 @@ +/* + * 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. + * + * $Revision$ + * $Author$ + * $Date$ + * + */ + +#include <stdlib.h> +#include <stdio.h> +#include <io.h> +#include <fcntl.h> +#include <process.h> +#include <float.h> +#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__ */ + +/* + * Setup the default file handles to have the _CRT_fmode mode, as well as + * any new files created by the user. + */ +extern unsigned int _CRT_fmode; + +static void +_mingw32_init_fmode () +{ + /* Don't set the 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); + } + } +} + +/* 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 for stdin, stdout and stderr, as well + * as files later opened by the user, to _CRT_fmode. + * 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 (); +} + |