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