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/* libccrt0.cc: crt0 for libc [newlib calls this one]
Copyright 1996, 1998, 1999, 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. */
#undef MALLOC_DEBUG
#include "winsup.h"
#include <reent.h>
#include <stdlib.h>
typedef int (*MainFunc) (int argc, char *argc[], char **env);
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;
};
static per_process this_proc;
/* Set up pointers to various pieces so the dll can then use them,
and then jump to the dll. */
static void
cygwin_crt0_common (MainFunc f)
{
/* 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. */
int onstack;
/* The version numbers are the main source of compatibility checking.
As a backup to them, we use the size of the per_process struct. */
this_proc.magic_biscuit = sizeof (per_process);
/* cygwin.dll version number in effect at the time the app was created. */
this_proc.dll_major = CYGWIN_VERSION_DLL_MAJOR;
this_proc.dll_minor = CYGWIN_VERSION_DLL_MINOR;
this_proc.api_major = CYGWIN_VERSION_API_MAJOR;
this_proc.api_minor = CYGWIN_VERSION_API_MINOR;
this_proc.ctors = &__CTOR_LIST__;
this_proc.dtors = &__DTOR_LIST__;
this_proc.envptr = &environ;
this_proc.impure_ptr_ptr = &_impure_ptr;
this_proc.main = f;
this_proc.fmode_ptr = &_fmode;
this_proc.initial_sp = (char *) &onstack;
/* Remember whatever the user linked his application with - or
point to entries in the dll. */
this_proc.malloc = &malloc;
this_proc.free = &free;
this_proc.realloc = &realloc;
this_proc.calloc = &calloc;
/* Setup the module handle so fork can get the path name. */
this_proc.hmodule = GetModuleHandle (0);
/* variables for fork */
this_proc.data_start = &_data_start__;
this_proc.data_end = &_data_end__;
this_proc.bss_start = &_bss_start__;
this_proc.bss_end = &_bss_end__;
}
/* for main module */
void
cygwin_crt0 (MainFunc f)
{
cygwin_crt0_common (f);
/* Jump into the dll. */
dll_crt0 (&this_proc);
}
/* for a loaded dll */
int
cygwin_attach_dll (HMODULE h, MainFunc f)
{
cygwin_crt0_common (f);
/* jump into the dll. */
return dll_dllcrt0 (h, &this_proc);
}
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