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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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Disc2.iso
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vc98
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crt
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src
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atonexit.c
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C/C++ Source or Header
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1998-06-17
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5KB
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173 lines
/***
*atonexit.c - _onexit/atexit for using the MSVCRT* model of C run-time
*
* Copyright (c) 1993-1997, Microsoft Corporation. All rights reserved.
*
*Purpose:
* atexit and _onexit are handled differently for EXE's and DLL's linked
* with MSVCRT.LIB to call MSVCRT*.DLL. Specifically, the _onexit/atexit
* list for DLL's must be maintained on a per-module basis and must be
* processed at DLL process detach . For EXE's the atexit/_onexit list
* should be maintained by MSVCRT*.DLL and processed at process exit.
*
*******************************************************************************/
#ifndef _MAC
/*
* SPECIAL BUILD MACRO! Note that atonexit.c is linked in with the client's
* code. It does not go into crtdll.dll! Therefore, it must be built under
* the _DLL switch (like user code) and CRTDLL must be undefined.
*/
#undef CRTDLL
#define _DLL
#include <cruntime.h>
#include <oscalls.h>
#include <internal.h>
#include <stdlib.h>
/*
* routine in DLL to do initialization (in this case, C++ constructors)
*/
extern void __cdecl _initterm(_PVFV *, _PVFV *);
/*
* Pointers to beginning and end of the table of function pointers manipulated
* by _onexit()/atexit(). If this module is an EXE, _onexitbegin will be -1.
* Otherwise _onexitbegin will point to a block of malloc-ed memory used to
* maintain the DLL module's private onexit list of terminator routines.
*/
_PVFV *__onexitbegin;
_PVFV *__onexitend;
/***
*_onexit, atexit - calls to _onexit & atexit in MSVCRT*.DLL
*
*Purpose:
* A DLL linked with MSVCRT.LIB must not call the standard _onexit or
* atexit exported from MSVCRT*.DLL, but an EXE linked with MSVCRT.LIB
* will call the standard versions of those two routines. The standard
* names are not exported from MSVCRT*.DLL, but the _imp__* names are,
* so this module can just invoke the standard versions if linked into
* an EXE module (indicated by __onexitbegin == -1). If this module is
* linked into a DLL (indicated by __onexitbegin != -1), it will call a
* helper routine in MSVCRT*.DLL called __dllonexit to manager the DLL's
* private onexit list.
*
*Entry:
* Same as the regular versions of _onexit, atexit.
*
*Exit:
* Same as the regular versions of _onexit, atexit.
*
*Exceptions:
*
*******************************************************************************/
extern _onexit_t __dllonexit(_onexit_t, _PVFV**, _PVFV**);
#ifdef _M_IX86
extern _onexit_t (__cdecl *_imp___onexit)(_onexit_t func);
#else /* _M_IX86 */
extern _onexit_t (__cdecl *__imp__onexit)(_onexit_t func);
#endif /* _M_IX86 */
_onexit_t __cdecl _onexit (
_onexit_t func
)
{
#ifdef _M_IX86
return( (__onexitbegin == (_PVFV *) -1)
/* EXE */ ? (*_imp___onexit)(func)
/* DLL */ : __dllonexit(func, &__onexitbegin, &__onexitend));
#else /* _M_IX86 */
return( (__onexitbegin == (_PVFV *) -1)
/* EXE */ ? (*__imp__onexit)(func)
/* DLL */ : __dllonexit(func, &__onexitbegin, &__onexitend) );
#endif /* _M_IX86 */
}
int __cdecl atexit (
_PVFV func
)
{
return (_onexit((_onexit_t)func) == NULL) ? -1 : 0;
}
#else /* _MAC */
#undef CRTDLL
#define _DLL
#include <cruntime.h>
#include <malloc.h>
#include <internal.h>
#include <stdlib.h>
#include <fltintrn.h>
/*
* routines in DLL to do onexit calls for EXE and DLL, respectively
*/
extern _onexit_t _cdecl __onexit(_onexit_t);
extern _onexit_t _cdecl __dllonexit(_onexit_t, PFV**, PFV**);
/*
* Pointers to beginning and end of the table of function pointers manipulated
* by _onexit()/atexit(). If this module is an EXE, _onexitbegin will be -1.
* Otherwise _onexitbegin will point to a block of malloc-ed memory used to
* maintain the DLL module's private onexit list of terminator routines.
*/
PFV *__onexitbegin;
PFV *__onexitend;
/***
*_onexit, atexit - calls to _onexit & atexit in MSVCRT*.DLL
*
*Purpose:
* A DLL linked with MSVCRT.LIB must not call the standard _onexit or
* atexit exported from MSVCRT*.DLL, and an EXE linked with MSVCRT.LIB
* will this version too. The standard
* names are not exported from MSVCRT*.DLL.
*
*Entry:
* Same as the regular versions of _onexit, atexit.
*
*Exit:
* Same as the regular versions of _onexit, atexit.
*
*Exceptions:
*
*******************************************************************************/
_onexit_t __cdecl _onexit (
_onexit_t func
)
{
return( (__onexitbegin == (PFV *) -1)
/* EXE */ ? (__onexit)(func)
/* DLL */ : __dllonexit(func, &__onexitbegin, &__onexitend) );
}
int __cdecl atexit (
PFV func
)
{
return (_onexit((_onexit_t)func) == NULL) ? -1 : 0;
}
#endif /* _MAC */