31 lines
1.2 KiB
C
31 lines
1.2 KiB
C
/*
|
|
* Static instance of _on_exit_args struct.
|
|
*
|
|
* When _REENT_SMALL is used, _atexit struct only contains a pointer to
|
|
* _on_exit_args struct, so this was always allocated with malloc() - even for
|
|
* the first 32 calls of atexit()-like functions, which are guaranteed to
|
|
* succeed, but could fail because of "out of memory" error. This is even worse
|
|
* when _ATEXIT_DYNAMIC_ALLOC is _NOT_ defined, in which case malloc() is not
|
|
* used by internals of atexit()-like functions. In such configuration all calls
|
|
* to the functions that need _on_exit_args struct (on_exit() and
|
|
* __cxa_atexit()) would fail.
|
|
*
|
|
* Thats why a static instance of _on_exit_args struct is provided for
|
|
* _REENT_SMALL configuration. This way the first 32 calls to atexit()-like
|
|
* functions don't need malloc() and will always succeed.
|
|
*
|
|
* Because this struct is not needed for "normal" atexit(), it is used as a weak
|
|
* reference in __register_exitproc(), but any use of on_exit() or
|
|
* __cxa_atexit() will force it to be linked.
|
|
*/
|
|
|
|
#include <reent.h>
|
|
|
|
#ifdef _REENT_SMALL
|
|
|
|
static struct _on_exit_args _on_exit_args_instance = {{_NULL}, {_NULL}, 0, 0};
|
|
|
|
struct _on_exit_args * const __on_exit_args = &_on_exit_args_instance;
|
|
|
|
#endif /* def _REENT_SMALL */
|