48 lines
1.9 KiB
C
48 lines
1.9 KiB
C
/* atexit.c: atexit entry point
|
|
|
|
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 <stddef.h>
|
|
#include <sys/cygwin.h>
|
|
#include <windows.h>
|
|
|
|
/* Statically linked replacement for the former cygwin_atexit. We need
|
|
the function here to be able to access the correct __dso_handle of the
|
|
caller's DSO. */
|
|
|
|
int
|
|
atexit (void (*fn) (void))
|
|
{
|
|
extern int __cxa_atexit(void (*)(void*), void*, void*);
|
|
extern void *__dso_handle;
|
|
extern void *__ImageBase;
|
|
|
|
void *fixed_dso_handle = &__dso_handle;
|
|
/* Check for being called from inside the executable. If so, use NULL
|
|
as __dso_handle. This allows to link executables with GCC versions
|
|
not providing __dso_handle in crtbegin{S}.o. In this case our own
|
|
__dso_handle defined in lib/dso_handle.c is used. However, our
|
|
__dso_handle always points to &__ImageBase, while the __dso_handle
|
|
for executables provided by crtbegin.o usually points to NULL.
|
|
That's what we remodel here. */
|
|
if (&__ImageBase == (void **) GetModuleHandleW (NULL))
|
|
fixed_dso_handle = NULL;
|
|
/* With recent Cygwin versions starting with API version 0.280 we call
|
|
__cxa_atexit (which is actually the cygwin__cxa_atexit wrapper in
|
|
dcrt0.cc) with the address of __dso_handle since that's how g++ generates
|
|
calls to __cxa_atexit as well. However, when running an application
|
|
built with this atexit under an older Cygwin version, the __cxa_atexit
|
|
entry point is the one from newlib, which expects the *value* of
|
|
__dso_handle. So, check for the Cygwin version we're running under.
|
|
Older version prior to 0.280 don't know CW_FIXED_ATEXIT and return -1.
|
|
0.280 and later return 0. */
|
|
else if (cygwin_internal (CW_FIXED_ATEXIT) != 0)
|
|
fixed_dso_handle = __dso_handle;
|
|
|
|
return __cxa_atexit ((void (*)(void*))fn, NULL, fixed_dso_handle);
|
|
}
|