100 lines
2.8 KiB
C++
100 lines
2.8 KiB
C++
/* common.cc: common crt0 function for cygwin crt0's.
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Copyright 2000, 2001 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include "perprocess.h"
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#include "cygwin/version.h"
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#include "crt0.h"
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#include <reent.h>
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#include <stdlib.h>
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#undef environ
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extern "C"
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{
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char **environ;
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void cygwin_crt0 (MainFunc);
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int cygwin_attach_dll (HMODULE, MainFunc);
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int cygwin_attach_noncygwin_dll (HMODULE, MainFunc);
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int main (int, char **, char **);
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struct _reent *_impure_ptr;
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int _fmode;
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/* Set up pointers to various pieces so the dll can then use them,
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and then jump to the dll. */
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int __stdcall
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_cygwin_crt0_common (MainFunc f, per_process *u)
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{
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/* This is used to record what the initial sp was. The value is needed
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when copying the parent's stack to the child during a fork. */
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DWORD newu;
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int uwasnull;
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if (u != NULL)
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uwasnull = 0; /* Caller allocated space for per_process structure */
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else if ((newu = cygwin_internal (CW_USER_DATA)) == (DWORD) -1)
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return 0;
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else
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{
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u = (per_process *) newu; /* Using DLL built-in per_process */
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uwasnull = 1; /* Remember for later */
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}
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/* The version numbers are the main source of compatibility checking.
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As a backup to them, we use the size of the per_process struct. */
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u->magic_biscuit = sizeof (per_process);
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/* cygwin.dll version number in effect at the time the app was created. */
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u->dll_major = CYGWIN_VERSION_DLL_MAJOR;
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u->dll_minor = CYGWIN_VERSION_DLL_MINOR;
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u->api_major = CYGWIN_VERSION_API_MAJOR;
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u->api_minor = CYGWIN_VERSION_API_MINOR;
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u->ctors = &__CTOR_LIST__;
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u->dtors = &__DTOR_LIST__;
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u->envptr = &environ;
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if (uwasnull)
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_impure_ptr = u->impure_ptr; /* Use field initialized in newer DLLs. */
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else
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u->impure_ptr_ptr = &_impure_ptr; /* Older DLLs need this. */
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u->forkee = 0; /* This should only be set in dcrt0.cc
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when the process is actually forked */
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u->main = f;
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/* These functions are executed prior to main. They are just stubs unless the
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user overrides them. */
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u->premain[0] = cygwin_premain0;
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u->premain[1] = cygwin_premain1;
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u->premain[2] = cygwin_premain2;
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u->premain[3] = cygwin_premain3;
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u->fmode_ptr = &_fmode;
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u->initial_sp = (char *) __builtin_frame_address (1);
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/* Remember whatever the user linked his application with - or
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point to entries in the dll. */
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u->malloc = &malloc;
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u->free = &free;
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u->realloc = &realloc;
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u->calloc = &calloc;
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/* Setup the module handle so fork can get the path name. */
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u->hmodule = GetModuleHandle (0);
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/* variables for fork */
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u->data_start = &_data_start__;
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u->data_end = &_data_end__;
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u->bss_start = &_bss_start__;
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u->bss_end = &_bss_end__;
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return 1;
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}
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} /* "C" */
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