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Showing content from https://en.cppreference.com/w/cpp/language/../../cpp/../c/header/../program/at_quick_exit.html below:

at_quick_exit - cppreference.com

int at_quick_exit( void (*func)(void) );

(since C11)

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 is guaranteed to support the registration of at least 32 functions. The exact limit is implementation-defined.

The registered functions will not be called on normal program termination. If a function need to be called in that case, atexit must be used.

[edit] Parameters func - pointer to a function to be called on quick program termination [edit] Return value

​0​ if the registration succeeds, nonzero value otherwise.

[edit] Example 
#include <stdlib.h>
#include <stdio.h>
 
void f1(void)
{
    puts("pushed first");
    fflush(stdout);
}
 
void f2(void)
{
    puts("pushed second");
}
 
int main(void)
{
    at_quick_exit(f1);
    at_quick_exit(f2);
    quick_exit(0);
}

Output:

pushed second
pushed first
[edit] References
[edit] See also causes abnormal program termination (without cleaning up)
(function) [edit] causes normal program termination with cleaning up
(function) [edit] registers a function to be called on exit() invocation
(function) [edit] causes normal program termination without completely cleaning up
(function) [edit]

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