Defined in header
int at_quick_exit( void (*func)() );
Registers the function pointed to by
func to be called on quick program termination (via quick_exit).
Calling the function from several threads does not induce a data race. The implementation shall support the registration of at least 32 functions.
|func||-||pointer to a function to be called on normal program termination|
 Return value
0 if the registration succeeds, nonzero value otherwise.
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 See also
| registers a function to be called on exit() invocation
C++ documentation for at_quick_exit