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